CN111261003A - Probability demonstration device for mathematical teaching - Google Patents

Abstract

A probability demonstration device for mathematics teaching, which is used to realize the deduction of the classical probability formula. It includes: a base with a lug plate on the top of the base; a storage mechanism, the storage mechanism includes a storage cylinder, a fixing ring fixed at the lower part of the storage cylinder, a pair of limit plates slidably arranged on the bottom of the fixing ring, and a pair of limit plates arranged on the limit plate The spring between the fixing ring and the fixed ring, a pair of wire pulleys arranged on the upper part of the storage cylinder, and the pull wire between the wire pulley and the corresponding limit plate; the push-out mechanism, which is set on the left side of the storage cylinder, is used to push the storage cylinder to the maximum. The coin below is pushed out to the right side of the storage cylinder; the tossing mechanism includes a rocker hinged with the base, a support plate fixed at the front end of the rocker, and a drive unit arranged on the base to drive the rocker to swing, and a concave is provided on the top of the base. groove, the pallet is placed in the groove in the natural state. The device can facilitate the demonstration of probability.

Description

A probability demonstration device for mathematics teaching

technical field

The invention relates to the technical field of advanced mathematics teaching, in particular to a probability demonstration device for mathematics teaching.

Background technique

Probability is one of the most difficult knowledge points in advanced mathematics to be mastered by explanation alone, among which classical probability is the first concept that comes into contact in probability learning. For the deduction of the classical probability formula, more trials are needed as support.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a probability demonstration device for mathematics teaching, which is used to realize the deduction of the classical probability formula.

The technical solution adopted by the present invention to solve the technical problem is: a probability demonstration device for mathematics teaching, which is characterized in that it includes:

The base is provided with an ear plate on the top of the base;

The storage mechanism includes a storage cylinder, a fixing ring fixed at the lower part of the storage cylinder, a pair of limit plates slidably arranged at the bottom of the fixing ring, a spring arranged between the limit plate and the fixing ring, and a spring arranged on the upper part of the storage cylinder. A pair of wire pulleys, the pull wire arranged between the wire pulley and the corresponding limit plate, the limit plate is placed in the lower part of the inner cavity of the storage cylinder under the action of the spring, and the limit plate is pulled by the pull wire when the wire pulley is rotated, so that the limit plate is moved from The lower part of the inner cavity of the storage cylinder is removed;

The push-out mechanism, which is arranged on the left side of the storage cylinder, is used to push out the coins at the bottom of the storage cylinder to the right side of the storage cylinder;

The throwing mechanism includes a rocker hinged with the base, a support plate fixed at the front end of the rocker, and a drive unit arranged on the base to drive the rocker to swing. There is a groove on the top of the base, and the support plate is placed in the groove in the natural state Inside.

Further, a pair of installation grooves are arranged on the fixing ring, and a first guide wheel and a second guide wheel are rotatably installed in the installation groove, the first end of the pull wire is fixedly connected with the limit plate, and the second end of the pull wire is connected with the wire wheel. The outer wall is fixedly connected, and the pull wire is in contact with the first and second guide wheels.

Further, the wire pulley and the driven gear are arranged coaxially, and a driving gear meshed with the driven gear is rotatably mounted on the upper part of the storage cylinder.

Further, the driving mechanism includes a motor fixed on the base, a crank fixed on the output end of the motor, a connecting rod hinged with the rear end of the rocker, and the connecting rod is also hingedly connected with the crank.

Further, a pair of lugs are fixed on the top of the base, and the lugs are hinged with the rocker.

Further, a fixing ring is fixed on the top of the base, the limiting ring is placed inside the fixing ring, and the outer wall of the limiting ring is in contact with the inner wall of the fixing ring.

The beneficial effects of the present invention are: a probability demonstration device for mathematics teaching provided by the present invention, the coin falls under its own weight, and the coin moved out of the storage cylinder is moved out of the storage cylinder under the action of the push-out mechanism, and then thrown out by the tossing mechanism, Then do statistics.

Description of drawings

Fig. 1 is the front schematic diagram of the present invention;

Fig. 2 is the schematic diagram after removing the enclosure plate in Fig. 1;

Fig. 3 is the schematic diagram of the push-out mechanism;

4 is a schematic diagram of a throwing mechanism;

5 is a schematic diagram of a storage mechanism;

6 is a schematic diagram of the internal structure of the storage mechanism;

Fig. 7 is the A-direction view in Fig. 5;

Fig. 8 is a partial enlarged schematic diagram at B in Fig. 6;

Figure 9 is a schematic diagram of the placement of coins in the storage cylinder;

In the picture: 1 base, 11 enclosure, 12 lugs, 2 electric telescopic rods, 21 push plates, 3 rockers, 31 pallets, 32 lugs, 33 connecting rods, 34 cranks, 35 motors, 4 positioning rings, 41 Opening, 5 storage cylinder, 6 fixing ring, 61 limit plate, 611 spring plate, 612 spring, 62 installation groove, 63 first guide wheel, 64 second guide wheel, 65 pull wire, 66 wire wheel, 67 driven gear, 68 drive gears, 69 knobs, 7 coins.

Detailed ways

As shown in Figures 1 to 9, the present invention mainly includes a base 1, a surrounding plate 11, a push-out mechanism, a storage mechanism and a throwing mechanism. The present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2 , the base 1 is a rectangular structure, and an enclosure plate 11 is fixed on the top of the base. The enclosure plate is a closed structure and includes four side walls. A positioning ring 4 is arranged at the left end of the top of the base, and the positioning ring is a circular ring structure. An opening 41 is provided on the side wall of the lower part of the positioning ring to facilitate the removal of coins.

A storage mechanism is installed on the positioning ring. As shown in Figures 5 to 9, the storage mechanism includes a cylindrical storage cylinder 5, a fixing ring 6 fixed on the lower outer wall of the storage cylinder, and a pair of left and right sliding sets on the bottom of the fixing ring. The set limit plate 61, the first guide wheel 63 rotatably installed in the installation groove 62 on the fixed ring, the second guide wheel 64 rotatably installed in the installation groove on the fixed ring, rotatably installed on the upper outer wall of the storage cylinder A pair of wire pulleys 66, a driven gear 67 arranged coaxially with the wire pulley, a driving gear 68 rotatably installed on the upper outer wall of the storage cylinder, a pull wire 65 disposed between the limit plate and the wire pulley, and a fixed ring A spring plate 611 at the bottom, a spring 612 arranged between the spring plate and the limit plate, a knob 69 is fixed on the driving gear, and the driving gear is engaged with the driven gear. The installation grooves are a pair of left and right, the first end of the pull wire is fixedly connected with the limit plate, and after the pull wire contacts the first and second guide wheels, the second end of the pull wire is wound around the outer wall of the pull wire. Under the action of the spring, a section of the limiting plate is placed under the inner cavity of the storage cylinder, thereby supporting the coins in the storage cylinder. When the knob is turned, the pull wire can be wound on the spool, and then the limit plate can be moved by the pull wire, so that the limit plate is moved away from the inner cavity of the storage cylinder. After the limiting plate is removed from the lower part of the inner cavity of the storage cylinder, the coins in the storage cylinder fall down under the action of its own gravity. As shown in FIG. 9, coins 7 are placed in the cartridge. A damping member is arranged between the wire wheel and the storage cylinder, so that the spring is compressed and fixed under the action of the damping member, and the limiting plate and the fixing ring are relatively fixed.

There is a push-out mechanism on the base. As shown in Figure 3, the push-out mechanism includes an electric telescopic rod 2 fixed on the top of the base and a push plate 21 fixed on the electric telescopic rod. Under the action of the electric telescopic rod, the push plate can pass through Enter the positioning ring through the notch.

When in use, the lower part of the storage cylinder is placed in the positioning ring, and at this time, the outer wall of the fixing ring contacts the inner wall of the positioning ring, thereby realizing the fixing of the storage cylinder. Rotating the knob can drive the two limit plates to move to both sides. When the limit plates move away from the inner cavity of the storage cylinder, the coins 7 in the storage cylinder fall under their own weight and the bottom coin moves out of the storage cylinder. The thickness of the push plate is equal to the thickness of the coin and the thickness of the limit plate.

In order to realize the tossing of coins, a tossing mechanism is also provided on the top of the base. As shown in Figures 3 and 4, a pair of lugs 12 are fixed on the top of the base, and a rocker 3 is hingedly installed on the lugs. A support plate 31 is fixed at the front end of the plate, and a groove for accommodating the support plate is provided at the top of the base. A motor 35 is fixed on the top of the base, a crank 34 is fixed at the output end of the motor, an ear plate 32 is fixed at the rear end of the rocker, a connecting rod 33 is arranged between the ear plate and the crank, and the connecting rod is connected to the ear plate and the connecting rod. Both are hingedly connected to the crank. Under the action of the motor, the rocker can be driven to swing around the hinge point, and when the rear end of the rocker moves downward, the support plate at the front end of the rocker throws the coin, thereby realizing the tossing of the coin. When the rear end of the rocker is placed at the highest point, the support plate is placed in the groove, and the push-out mechanism can push the coins in the storage cylinder to the support plate at this time. The motor, crank and connecting rod form the drive unit.

The use of the present invention is described below:

(1), place the coin in the storage cylinder, then place the storage cylinder on the fixing ring, and rotate the knob to make the limit plate move away from the inner cavity of the storage cylinder;

(2) Drive the action of the electric telescopic rod. At this time, the push plate continuously moves in and out of the fixed ring, and pushes the coins in the storage cylinder to the support plate one by one;

(3) After the coin is placed on the pallet, the motor moves to throw the coin;

(4) After all coins are tossed, count the number of coins that come up on both sides.

Claims (6)

1. A probability demonstration device for mathematics teaching, characterized in that it comprises: The base is provided with an ear plate on the top of the base; The storage mechanism includes a storage cylinder, a fixing ring fixed at the lower part of the storage cylinder, a pair of limit plates slidably arranged at the bottom of the fixing ring, a spring arranged between the limit plate and the fixing ring, and a spring arranged on the upper part of the storage cylinder. A pair of wire pulleys, the pull wire arranged between the wire pulley and the corresponding limit plate, the limit plate is placed in the lower part of the inner cavity of the storage cylinder under the action of the spring, and the limit plate is pulled by the pull wire when the wire pulley is rotated, so that the limit plate is moved from The lower part of the inner cavity of the storage cylinder is removed; The push-out mechanism, which is arranged on the left side of the storage cylinder, is used to push out the coins at the bottom of the storage cylinder to the right side of the storage cylinder; The throwing mechanism includes a rocker hinged with the base, a support plate fixed at the front end of the rocker, and a drive unit arranged on the base to drive the rocker to swing. There is a groove on the top of the base, and the support plate is placed in the groove in the natural state Inside. 2 . The probability demonstration device for mathematics teaching according to claim 1 , wherein a pair of installation grooves are arranged on the fixing ring, and the first guide wheel and the second guide wheel are rotatably installed in the installation grooves. 3 . The first end of the pulling wire is fixedly connected with the limit plate, the second end of the pulling wire is fixedly connected with the outer wall of the wire wheel, and the pulling wire is in contact with the first and second guide wheels. 3 . The probability demonstration device for mathematics teaching according to claim 1 , wherein the wire wheel and the driven gear are arranged coaxially, and a driving gear that meshes with the driven gear is rotatably installed on the upper part of the storage cylinder. 4 . 4. A probability demonstration device for mathematics teaching according to claim 1, wherein the driving mechanism comprises a motor fixed on the base, a crank fixed on the output end of the motor, and a connecting rod hinged with the rear end of the rocker , the connecting rod is also hingedly connected with the crank. 5 . The probability demonstration device for mathematics teaching according to claim 1 , wherein a pair of lugs are fixed on the top of the base, and the lugs are hinged with the rocker. 6 . 6. A probability demonstration device for mathematics teaching according to claim 1, wherein a fixing ring is fixed on the top of the base, the limiting ring is placed inside the fixing ring and the outer wall of the limiting ring and the inner wall of the fixing ring are touch.

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