CN211403794U

CN211403794U - Mathematical probability demonstration device

Info

Publication number: CN211403794U
Application number: CN202020103028.9U
Authority: CN
Inventors: 许乃伟; 刘春燕
Original assignee: Shandong Water Conservancy Vocational College
Current assignee: Shandong Water Conservancy Vocational College
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-09-01
Anticipated expiration: 2030-01-17

Abstract

The utility model relates to a mathematical probability presentation device, comprising a base plate, the right-hand member top of bottom plate is fixed with the bracing piece, the bracing piece top is fixed with the backup pad, the left end top of bottom plate is equipped with accepts the bucket, the left end of backup pad is equipped with the bar through-hole, be fixed with the elastic rubber layer on the back lateral wall of bar through-hole, the both sides of bar through-hole are equipped with circular through-hole, be equipped with the guide arm in the circular through-hole, the top of guide arm is fixed with the clamp plate, the bottom of guide arm is fixed with the limiting plate, limiting plate upper portion is equipped with the spring, the right side of accepting the bucket is equipped with two record poles, be equipped with the scale on. The utility model discloses a spring force drives the vertical coin of inserting in the bar through-hole of clamp plate striking, and in the coin was thrown and is fallen to accepting the bucket, the coin can not be lost, practices thrift the seek time to be equipped with the position that record ring and record pole can correspond the record ring according to the number of times regulation of positive and negative, the result of watching is more directly perceived.

Description

Mathematical probability demonstration device

Technical Field

The utility model belongs to the technical field of the mathematics apparatus, concretely relates to mathematics probability presentation device.

Background

Probability theory is one of the important knowledge points in mathematics, and probability is also called probability, possibility and the like, is an abstract concept, so students have difficulty in understanding, and therefore, probability experiment demonstration devices are usually used for teaching demonstration to help students understand.

The coin throwing experiment is a commonly-done probability experiment, the probability that one face of a coin faces upwards is one half after the coin is thrown for multiple times, the current coin throwing laboratory obtains a result after the coin is thrown by hands, then the result is counted, the final vertical state is seen, but the result is not visual, the coin is easy to drop in the throwing process, and the time is wasted when the coin is searched again.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a mathematics probability presentation device solves the hand and throws coin waste time to the not audio-visual problem of statistical result.

The utility model discloses a mathematical probability demonstration device, which comprises a bottom plate, a support rod is fixed on the top of the right end of the bottom plate, a support plate is fixed on the top of the support rod, a receiving barrel is arranged on the top of the left end of the bottom plate, a bar-shaped through hole is arranged on the left end of the support plate, the left and right width of the bar-shaped through hole is in clearance fit with the outer diameter of a coin, an elastic rubber layer is fixed on the rear side wall of the bar-shaped through hole, the width between the inner wall of the elastic rubber layer and the front side wall of the bar-shaped through hole is in interference fit with the thickness of the coin, circular through holes are arranged on the left and right sides of the bar-shaped through hole, a guide rod is arranged in the circular through hole, a press plate is fixed on the top of the guide rod, a limiting plate is fixed on the bottom of the guide, the inner hole of the elastic rubber sleeve is in interference fit with the outer wall of the recording rod.

Preferably, the bottom outside of bar through-hole is equipped with circular recess, makes things convenient for the coin to throw down.

Preferably, the outer sides of the two recording rings are respectively fixed with a marking plate, and the marking plates on the two recording rings are coated with coatings with different colors, so that the result can be visually compared conveniently.

Preferably, the bottom of the bottom plate is fixed with an anti-skidding rubber pad to prevent the bottom plate from skidding.

Compared with the prior art, the utility model has the advantages of:

drive the vertical coin of inserting in the bar through-hole of clamp plate striking through spring force, make the coin throw fall accept the bucket in, guarantee that the coin is vertical to be thrown and fall, and the coin can not lose, practice thrift the seek time to be equipped with the position that record ring and record pole can the corresponding record ring of number of times regulation of root front and back, make the result of watching more directly perceived.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic top view of the support plate;

in the figure: 1. the device comprises a pressing plate, 2, coins, 3, a guide rod, 4, a supporting plate, 5, a recording rod, 6, a supporting rod, 7, a recording ring, 8, a marking plate, 9, a bottom plate, 10, an anti-skidding rubber pad, 11, an elastic rubber sleeve, 12, a receiving barrel, 13, a limiting plate, 14, a circular groove, 15, a strip-shaped through hole, 16, a circular through hole, 17, an elastic rubber layer, 18 and a spring.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

The mathematical probability demonstration device as shown in fig. 1 to 3 comprises a bottom plate 9, a support rod 6 is fixed on the top of the right end of the bottom plate 9, a support plate 4 is fixed on the top of the support rod 6, a receiving barrel 12 is arranged on the top of the left end of the bottom plate 9, a strip-shaped through hole 15 is arranged on the left end of the support plate 4, the left width and the right width of the strip-shaped through hole 15 are in clearance fit with the outer diameter of a coin 2, an elastic rubber layer 17 is fixed on the rear side wall of the strip-shaped through hole 15, the width between the inner wall of the elastic rubber layer 17 and the front side wall of the strip-shaped through hole 15 is in interference fit with the thickness of the coin 2, circular through holes 16 are arranged on the left side and the right side of the strip-shaped through hole 15, a guide rod 3 is arranged in the circular through hole 16, a press plate 1 is fixed on the top of the guide rod 3, a, the recording rod 5 is sleeved with a recording ring 7, an elastic rubber sleeve 11 is fixed in an inner hole of the recording ring 7, and the inner hole of the elastic rubber sleeve 11 is in interference fit with the outer wall of the recording rod 5.

The outer side of the bottom end of the strip-shaped through hole 15 is provided with a circular groove 14.

The outer sides of the two recording rings 7 are fixed with the marking plates 8, and the marking plates 8 on the two recording rings 7 are coated with coatings with different colors.

An anti-skid rubber pad 10 is fixed at the bottom of the bottom plate 9.

When the coin receiving device is used, the receiving barrel is placed under the strip-shaped through hole, the recording ring is pulled to the uppermost or lowermost scale position of the recording rod, the pressing plate is pulled to overcome the elastic force of the spring, the coins are placed into the strip-shaped through hole, the coin is not more than one half exposed, the pressing plate is loosened, the pressing plate moves downwards under the action of the elastic force of the spring to impact the coins, the coins are ejected from the lower part of the strip-shaped through hole, the coins fall into the receiving barrel, when the coins stop, the direction of the coins is observed, the corresponding recording ring is moved by one scale according to the result, the receiving barrel is overturned to pour out the coins, the result is recorded by repeating the fixed times of the steps, and whether the result is one half is observed through the position of the recording ring, namely, the position of.

To sum up, the utility model discloses a spring force drives the vertical coin of inserting in the bar through-hole of clamp plate striking, makes the coin throw fall accept the bucket in, guarantees that the coin is vertical to be thrown and falls, and the coin can not lose, practices thrift the seek time to be equipped with the position that record ring and record pole can the number of times regulation of root base positive and negative correspond the record ring, make the viewing result more directly perceived.

In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "up", "down", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the present invention rather than requiring the present invention to be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Claims

1. A mathematical probability demonstration apparatus comprising a base plate (9), characterized in that: a supporting rod (6) is fixed at the top of the right end of the bottom plate (9), a supporting plate (4) is fixed at the top of the supporting rod (6), a bearing barrel (12) is arranged at the top of the left end of the bottom plate (9), a strip-shaped through hole (15) is arranged at the left end of the supporting plate (4), the left and right width of the strip-shaped through hole (15) is in clearance fit with the outer diameter of the coin (2), an elastic rubber layer (17) is fixed on the rear side wall of the strip-shaped through hole (15), the width between the inner wall of the elastic rubber layer (17) and the front side wall of the strip-shaped through hole (15) is in interference fit with the thickness of the coin (2), circular through holes (16) are arranged at the left and right sides of the strip-shaped through hole (15), a guide rod (3) is arranged in the circular through hole (16), a pressing plate (1) is fixed at the top of the guide rod, the right side of accepting bucket (12) is equipped with two record pole (5), all is equipped with the scale along vertical direction on two record pole (5), and the cover has record ring (7) on record pole (5), and the hole internal fixation of record ring (7) has elastic rubber cover (11), and elastic rubber cover (11) hole is interference fit with record pole (5) outer wall.

2. The mathematical probability presentation device of claim 1, wherein: the outer side of the bottom end of the strip-shaped through hole (15) is provided with a circular groove (14).

3. The mathematical probability presentation device of claim 2, wherein: the outer sides of the two recording rings (7) are respectively fixed with a mark plate (8), and the mark plates (8) on the two recording rings (7) are coated with coatings with different colors.

4. The mathematical probability presentation device of claim 1, wherein: an anti-skid rubber pad (10) is fixed at the bottom of the bottom plate (9).