Statistics probability demonstration model

Abstract

The utility model belongs to the technical field of demonstration teaching aids, and discloses a statistics probability demonstration model which comprises a box body, a first partition plate is fixedly connected in the box body, a vertical sliding groove is formed in one side of the first partition plate, a ball storage frame is connected to the sliding groove in a sliding mode, and a ball falling hole is formed in the lower surface of the ball storage frame. A groove is formed in the back face of the ball storage frame, a spring is fixedly connected into the groove, a locking bolt is fixedly connected to the spring, a vertical through groove is formed in the back face of the box body, a plurality of locking grooves matched with the locking bolt are vertically formed in the through groove, and a second handle is arranged on the back face of the ball storage frame. According to the utility model, through the arrangement of the ball storage frame capable of moving up and down, demonstration personnel can demonstrate the distribution condition of small balls with different heights after falling down, so that the universality of normal distribution is demonstrated, and through the arrangement of the stirring shaft in the ball storage frame, the demonstration randomness can be improved, and the demonstration result is more reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of demonstration teaching aids, in particular to a statistical probability demonstration model. Background Art

[0002] Normal distribution is very common in daily life. It is a continuous probability distribution with a bell-shaped curve, usually called Gaussian distribution or normal curve. Normal distribution is widely used in statistics, natural sciences, social sciences, engineering and other fields, because many natural phenomena and human behaviors can be described by normal distribution. In the classroom, when normal distribution needs to be demonstrated, the demonstration model of normal distribution is mostly used. Because the classroom is large, the demonstration model required is also relatively large. The current demonstration model needs to flip the entire device after a demonstration so that the demonstration ball used for demonstration returns to the top of the device for the next demonstration. However, because the teaching model is large and the position of the podium is relatively narrow, it is difficult to completely flip the entire device. In addition, the existing demonstration model cannot adjust the drop height of the ball, and cannot further demonstrate the occurrence of randomness. And because the ball is not randomly stirred before the demonstration, it is impossible to further show the randomness of the device demonstration. When the light is dim, students who are far away cannot see the demonstration clearly. Utility Model Content

[0003] The purpose of the utility model is to provide a statistical probability demonstration model to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a statistical probability demonstration model, including a box body, a first partition is fixedly connected to the inside of the box body, a vertical slide groove is provided on one side of the first partition, a ball storage frame is slidably connected to the slide groove, a ball falling hole is provided on the lower surface of the ball storage frame, a groove is provided on the back of the ball storage frame, a spring is fixedly connected in the groove, a locking bolt is fixedly connected to the spring, a vertical through groove is provided on the back of the box body, a plurality of locking grooves matching the locking bolt are vertically provided on the through groove, and a second handle is provided on the back of the ball storage frame; evenly distributed blocking rods are provided below the ball storage frame, a plurality of equidistant second partitions are provided below the blocking rods, a first slide plate slidably connected to the box body is provided on the lower surface of the second partition, the first slide plate passes through the box body and extends to the outside of the box body; a lifting ball return component that can move vertically up and down along the box body is provided on the other side of the first partition.

[0005] Preferably, four universal wheels are arranged on the lower surface of the box body, and the universal wheels are distributed on the lower surface of the box body in a U-shape.

[0006] Preferably, a second slide plate is slidably connected to the bottom of the ball storage frame near the ball falling hole, and the second slide plate penetrates the box body and extends to the rear end of the box body. A stirring shaft is arranged in the ball storage frame, and the stirring shaft penetrates the ball storage frame and the side of the box body and extends to the outside of the box body. The stirring shaft is rotatably connected to the box body, and a vertical through groove is provided at the relative position of the box body and the stirring shaft, and a turning handle is fixedly installed on one end of the stirring shaft outside the box body.

[0007] Preferably, the bottom of the ball storage frame is funnel-shaped, and the lower surface of the inner part of the box body below the first slide plate is set as an inclined surface, and the lower part of the inclined surface is close to the ball lifting and returning assembly.

[0008] Preferably, the front side of the box body is made of hard transparent plastic, and the front side of the ball storage frame is also made of hard transparent plastic.

[0009] Preferably, a light-emitting panel is provided on the rear surface of the inner wall of the box body.

[0010] Preferably, the lifting ball return assembly includes a base plate, a plurality of vertical sliding grooves are opened on the inner wall of the box body, the base plate is slidably connected to the sliding groove, the base plate is hinged with a rotating plate on the upper surface close to the first partition, a fixing column is arranged on the side of the upper surface of the base plate away from the hinge point, the fixing column is abutted against the lower surface of the rotating plate, an extrusion rod is arranged on the upper surface of the rotating plate, and a baffle rod cooperating with the extrusion rod is arranged on the upper surface of the first partition.

[0011] Preferably, first handles are provided on both the front and rear sides of the bottom plate, and a through slot matching the first handles is provided on the box body.

[0012] The beneficial effects of the utility model are as follows:

[0013] The utility model is provided with a ball storage frame that can move up and down, so that the demonstrator can demonstrate the distribution of small balls after falling from different heights, thereby demonstrating the universality of normal distribution, and by arranging a stirring shaft in the ball storage frame, the small balls waiting to fall can be stirred when the small balls fall, thereby improving the randomness of the demonstration and making the demonstration result more reliable. In addition, the device is provided with a lifting ball return component, and the demonstrator does not need to turn over the entire device, thereby avoiding the problem that the demonstrator has difficulty in turning over the entire device due to the relatively narrow position of the podium. In addition, the device is provided with a light-emitting panel, which can be turned on in dim light to facilitate students to watch the demonstration. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the front structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the back structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the back structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the lifting ball return assembly of the utility model.

[0018] In the figure: 1, box body; 2, first partition; 3, ball storage frame; 4, blocking rod; 5, second partition; 6, first slide plate; 7, bottom plate; 8, universal wheel; 9, second slide plate; 10, stirring shaft; 11, turning handle; 12, rotating plate; 13, squeezing rod; 14, blocking rod; 15, first handle; 16, fixing column; 17, spring; 18, locking bolt; 19, second handle. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The embodiment of the utility model provides a statistical probability demonstration model, including a box body 1, a first partition 2 is fixedly connected to the inside of the box body 1, a vertical slide groove is provided on one side of the first partition 2, a ball storage frame 3 is slidably connected to the slide groove, a ball falling hole is provided on the lower surface of the ball storage frame 3, a groove is provided on the back side of the ball storage frame 3, a spring 17 is fixedly connected in the groove, a locking bolt 18 is fixedly connected to the spring 17, a vertical through groove is provided on the back side of the box body 1, a plurality of locking grooves matching the locking bolt 18 are vertically provided on the through groove, and a second handle 19 is provided on the back side of the ball storage frame 3; evenly distributed blocking rods 4 are provided below the ball storage frame 3, a plurality of equidistant second partitions 5 are provided below the blocking rods 4, a first slide plate 6 slidably connected to the box body 1 is provided on the lower surface of the second partition plate 5, the first slide plate 6 passes through the box body 1 and extends to the outside of the box body 1; a lifting ball return component which can move vertically up and down along the box body 1 is provided on the other side of the first partition plate 2.

[0021] In this embodiment, the blocking rod 4 can be a polyhedral column or a cylinder. In this embodiment, a cylinder is selected. The blocking rods 4 are distributed in a honeycomb shape, and the distance between each blocking rod 4 is at least 1.5 times greater than the diameter of the demonstration ball. When the demonstrator uses this device for demonstration, the demonstration ball falls from the ball drop hole opened in the ball storage frame 3 to the blocking rod 4. The space below the blocking rod 4 is divided into a number of equidistant spaces by the second partition 5. The demonstration ball falls into different spaces under the action of the blocking rod 4, thereby demonstrating normal distribution to students. When it is necessary to demonstrate again, the first slide plate 6 is pulled out of the box body 1, and the demonstration ball slides into the lifting ball return assembly, and returns to the ball storage frame 3 again under the action of the lifting ball return assembly. When it is necessary to demonstrate the falling distribution of the demonstration balls at different heights, the locking bolt 18 on the back of the ball storage frame 3 is moved out of the locking groove, and then the second handle 19 is pulled to drive the ball storage frame 3 to move to a suitable height, and then the locking bolt 18 is inserted into the locking groove again, and the spring 17 presses the locking bolt 18 against the locking groove, thereby fixing the position of the ball storage frame 3.

[0022] In one of the more preferred embodiments, four universal wheels 8 are disposed on the lower surface of the box body 1 , and the universal wheels 8 are distributed on the lower surface of the box body 1 in a U-shaped shape.

[0023] In this embodiment, the universal wheel 8 is a universal wheel 8 with a locking structure. When the device needs to be moved, the universal wheel 8 can facilitate the movement of the device. When the device needs to be fixed, the universal wheel 8 is locked.

[0024] In one of the more preferred embodiments, a second slide plate 9 is slidably connected to the bottom of the ball storage frame 3 near the ball falling hole, and the second slide plate 9 penetrates the box body 1 and extends to the rear end of the box body 1. A stirring shaft 10 is arranged in the ball storage frame 3. The stirring shaft 10 penetrates the ball storage frame 3 and the side of the box body 1 and extends to the outside of the box body 1. The stirring shaft 10 is rotatably connected to the box body 1, and a vertical through groove is provided at the relative position of the box body 1 and the stirring shaft 10. A turning handle 11 is fixedly installed at one end of the stirring shaft 10 outside the box body 1.

[0025] In this embodiment, the stirring shaft 10 arranged in the box body 1 can make the ball fall from the ball hole more randomly. The second slide plate 9 can block the ball hole when the device is not demonstrating to prevent the ball from falling. The demonstrator can drive the stirring shaft 10 to rotate by turning the handle 11.

[0026] In one of the more preferred embodiments, the bottom of the ball storage frame 3 is funnel-shaped, and the lower surface of the inner part of the box body 1 below the first slide plate 6 is set as an inclined surface, and the lower part of the inclined surface is close to the lifting ball return assembly.

[0027] In this embodiment, the funnel-shaped structure can conveniently demonstrate the falling of the ball, and the inclined surface of the lower surface of the box body 1 can conveniently demonstrate that the ball reaches the lifting and returning ball assembly under the action of gravity.

[0028] In one of the more preferred embodiments, the front side of the box body 1 is made of hard transparent plastic, and the front side of the ball storage frame 3 is also made of hard transparent plastic.

[0029] In this embodiment, the hard transparent plastic can facilitate trainees to watch the demonstration.

[0030] In one of the more preferred embodiments, a light-emitting panel is provided on the rear surface of the inner wall of the box body 1 .

[0031] In this embodiment, the light-emitting board can facilitate trainees to watch the demonstration in dim light conditions.

[0032] In one of the more preferred embodiments, the ball-returning lifting assembly includes a base plate 7, a plurality of vertical slide grooves are provided on the inner wall of the box body 1, the base plate 7 is slidably connected to the slide grooves, a rotating plate 12 is hingedly connected to the upper surface of the base plate 7 close to the first partition 2, a fixed column 16 is provided on the side of the upper surface of the base plate 7 away from the hinge point, the fixed column 16 is abutted against the lower surface of the rotating plate 12, an extrusion rod 13 is provided on the upper surface of the rotating plate 12, and a blocking rod 14 cooperating with the extrusion rod 13 is provided on the upper surface of the first partition 2.

[0033] In this embodiment, the height of the fixed column 16 is lower than the height at which the rotating plate 12 is hinged to the bottom plate 7. When the demonstration ball enters the ball-returning lifting assembly, the demonstration ball will be on the upper surface of the rotating plate 12, and because of the inclined structure of the rotating plate 12, the demonstration ball will accumulate on the lower side of the rotating plate 12. When the bottom plate 7 rises, the rotating plate 12 will rise together with it, thereby driving the demonstration ball to rise. When the rotating plate 12 rises to a certain height, the extrusion rod 13 and the blocking rod 14 on the upper surface of the rotating plate 12 will conflict with each other, thereby driving the rotating plate 12 to rotate, thereby pouring the demonstration ball on the rotating plate 12 back into the ball storage frame 3.

[0034] In one of the more preferred embodiments, first handles 15 are provided on both the front and rear sides of the bottom plate 7 , and a through slot matching the first handles 15 is provided on the box body 1 .

[0035] In this embodiment, the demonstrator can drive the base plate 7 to rise via the first handle 15 .

[0036] Working principle:

[0037] When the demonstrator uses the device to demonstrate, the demonstration ball falls from the ball-dropping hole opened in the ball storage frame 3 to the blocking rod 4. The demonstrator can also use the turning handle 11 to rotate the stirring shaft 10 to stir the demonstration ball and make it fall more randomly. The space below the blocking rod 4 is divided into several equidistant spaces by the second partition 5. The demonstration ball falls into different spaces under the action of the blocking rod 4, thereby demonstrating the normal distribution to the students. When another demonstration is needed, the first slide 6 is pulled out of the box body 1, and the demonstration ball Slide into the lifting ball return assembly, the operator operates the lifting ball return assembly to lift, so that the demonstration ball returns to the ball storage frame 3. When it is necessary to demonstrate the falling distribution of balls at different heights, the locking bolt 18 on the back of the ball storage frame 3 is moved out of the locking groove, and then the second handle 19 is pulled to drive the ball storage frame 3 to move to a suitable height, and then the locking bolt 18 is inserted into the locking groove again. The spring 17 presses the locking bolt 18 against the locking groove, thereby fixing the position of the ball storage frame 3. When the light is dim, the light panel can be turned on for students to watch.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A statistical probability demonstration model, comprising a box body (1), characterized in that: A first partition (2) is fixedly connected to the inside of the box body (1), a vertical slide groove is provided on one side of the first partition (2), a ball storage frame (3) is slidably connected to the slide groove, a ball drop hole is provided on the lower surface of the ball storage frame (3), a groove is provided on the back of the ball storage frame (3), a spring (17) is fixedly connected in the groove, a locking bolt (18) is fixedly connected to the spring (17), a vertical through groove is provided on the back of the box body (1), a plurality of locking grooves cooperating with the locking bolt (18) are vertically provided on the through groove, and a second handle (19) is provided on the back of the ball storage frame (3); Evenly distributed blocking rods (4) are arranged below the ball storage frame (3); a plurality of equally spaced second partitions (5) are arranged below the blocking rods (4); a first slide plate (6) slidably connected to the box body (1) is arranged on the lower surface of the second partition plate (5); the first slide plate (6) penetrates the box body (1) and extends to the outside of the box body (1); A lifting ball return assembly which can move vertically up and down along the box body (1) is provided on the other side of the first partition plate (2).

2. A statistical probability demonstration model according to claim 1, characterized in that: Four universal wheels (8) are arranged on the lower surface of the box body (1), and the universal wheels (8) are distributed on the lower surface of the box body (1) in a square shape.

3. A statistical probability demonstration model according to claim 1, characterized in that: A second slide plate (9) is slidably connected to a position near the ball drop hole at the bottom of the ball storage frame (3). The second slide plate (9) penetrates the box body (1) and extends to the rear end of the box body (1). A stirring shaft (10) is arranged in the ball storage frame (3). The stirring shaft (10) penetrates the ball storage frame (3) and the side of the box body (1) and extends to the outside of the box body (1). The stirring shaft (10) is rotatably connected to the box body (1). A vertical through groove is provided at the relative position of the box body (1) and the stirring shaft (10). A turning handle (11) is fixedly mounted on one end of the stirring shaft (10) outside the box body (1).

4. A statistical probability demonstration model according to claim 1, characterized in that: The bottom of the ball storage frame (3) is funnel-shaped, and the lower surface of the interior of the box body (1) below the first slide plate (6) is arranged as an inclined surface, wherein the lower part of the inclined surface is close to the ball lifting and returning assembly.

5. A statistical probability demonstration model according to claim 1, characterized in that: The front surface of the box body (1) is made of hard transparent plastic, and the front surface of the ball storage frame (3) is also made of hard transparent plastic.

6. A statistical probability demonstration model according to claim 1, characterized in that: A light-emitting panel is provided on the rear surface of the inner wall of the box body (1).

7. A statistical probability demonstration model according to claim 1, characterized in that: The ball lifting and returning assembly comprises a bottom plate (7), a plurality of vertical slide grooves are provided on the inner wall of the box body (1), the bottom plate (7) is slidably connected to the slide grooves, a rotating plate (12) is hingedly connected to the upper surface of the bottom plate (7) close to the first partition (2), a fixing column (16) is provided on the side of the upper surface of the bottom plate (7) away from the hinge point, the fixing column (16) is in contact with the lower surface of the rotating plate (12), an extrusion rod (13) is provided on the upper surface of the rotating plate (12), and a blocking rod (14) matching the extrusion rod (13) is provided on the upper surface of the first partition (2).

8. A statistical probability demonstration model according to claim 7, characterized in that: The bottom plate (7) is provided with first handles (15) on both the front and rear sides, and the box body (1) is provided with a through slot matching the first handles (15).

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