CN202352186U - Portable angular momentum conservation apparatus - Google Patents

Abstract

The utility model relates to a portable angular momentum conservation instrument for demonstrating the principle of angular momentum conservation in classroom teaching. It is easy to carry and effective in teaching. Its technical solution: the bracket is fixed on the base by three movable plates to form a square frame; the lower rotating shaft is fixed in the lower cylinder of the installation box in the frame, the other end of the lower rotating shaft is placed on the supporting bearing of the base, and fixed in the cylinder above the installation box The upper shaft, the other end of the upper shaft passes through the fixing hole on the bracket; the left and right horizontal cylinders are respectively fixed in the cylinders on the left and right sides of the installation box, and the two top ends of the horizontal cylinder are installed with fixing screws; the winding device is installed in the installation box Cavity, one end passes through the hole at the back, and the other end is connected with the rotating shaft of the deceleration motor; the midpoint of the pull wire is fixed on the winding device, and the two ends are respectively connected with stainless steel balls, and placed in the cylinder; in the installation box Respectively equipped with a geared motor, a battery, and a remote control circuit board. The device is light and small, convenient to operate by remote control, simple in structure and low in cost.

Description

Portable Conservation of Angular Momentum

technical field

The utility model relates to a portable angular momentum conservation instrument used in university physics classroom teaching to demonstrate the principle of angular momentum conservation.

Background technique

At present, some of the existing demonstration instruments for the conservation of angular momentum are too bulky, and it is troublesome for teachers to bring them to class; some are easy to carry, but due to the relatively large friction of the system, the demonstration effect is not obvious; Very inconvenient, easy to hit the hand.

Contents of the invention

The purpose of this utility model is: in order to demonstrate the principle of conservation of angular momentum in teaching, the instrument needs to be easy to carry, the effect is obvious, and the remote control is convenient. A portable instrument for the conservation of angular momentum is specially provided.

In order to achieve the above object, the utility model adopts the following technical solutions: a portable angular momentum conservation instrument, which consists of a support, a base, a rotating shaft, a horizontal cylinder, a mounting box, a stainless steel ball, a pull wire, a geared motor, a battery, a remote control circuit board and a remote control composition. The bracket is composed of three plates that are movably connected, and the bracket is fixed on the base with thumb screws to form a square frame; the installation box is placed in the center of the square frame, the lower shaft is fixed with screws in the cylinder below the installation box, and the other end of the lower shaft is placed on the On the support bearing on the base, fix the upper shaft with screws in the cylinder above the installation box, and the other end of the upper shaft passes through the fixing hole on the bracket; fix the left horizontal cylinder with screws in the left cylinder of the installation box, and the left horizontal cylinder The downward angle with the horizontal direction is 5 ^O. In the right cylinder of the installation box, fix the right horizontal cylinder with screws. The angle between the right horizontal cylinder and the horizontal direction is 5 ^O. The left horizontal cylinder and the right horizontal cylinder One fixing screw is installed on the top of both sides of the barrel; the winder is installed in the inner cavity of the installation box, one end of the winder is fixed through the hole in the back of the installation box, and the other end is connected to the shaft of the geared motor in front of the installation box; pull the wire The middle point of the cable is fixed on the winding device, the left and right ends of the cable are respectively connected with the pull rings on the two stainless steel balls, and the two stainless steel balls are placed in the left horizontal cylinder and the right horizontal cylinder respectively, and the gear motor Screws are fixed above the front of the inner cavity of the installation box, the battery box is fixed on the back and lower side of the inner cavity of the installation box by screws, the remote control circuit board is fixed on the lower front of the inner cavity of the installation box by screws, the positive and negative poles of the battery are connected with the remote control circuit board The positive and negative poles are connected, and the output terminal of the remote control circuit board is connected with the input terminal of the geared motor.

Push the horizontal cylinder to rotate by hand, then the remote control motor rotates, winds the pull wire, pulls the stainless steel ball close to the rotating shaft, according to the law of conservation of angular momentum, the moment of inertia of the rotating part decreases, resulting in an increase in the rotational speed; the motor is controlled to rotate in the opposite direction, stainless steel As the ball moves away from the shaft, the moment of inertia of the rotating part increases, resulting in a decrease in the rotational speed.

The beneficial effect of the utility model is that the device is light and small, and is easy to carry; the operation of the instrument can be clearly seen by using transparent organic glass, the experimental effect is obvious, and the experiment can be repeated many times; the remote control mode can reduce damage and friction; Simple and easy to manufacture; all parts are detachable and easy to maintain; the core components of the instrument are standard parts, easy to purchase, and low in cost.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the structural representation of the portable angular momentum conservation instrument of the present invention. the

Fig. 2 is a schematic diagram of the internal structure of the installation box of the portable conservation of angular momentum instrument of the present invention. the

Fig. 3 is a schematic diagram of the remote controller of the utility model portable conservation of angular momentum instrument.

In the figure 1. Bracket, 2. Base, 3. Support bearing, 4. Fixing hole, 5. Upper shaft, 6. Lower shaft, 7. Installation box, 8. Right horizontal cylinder, 9. Left horizontal cylinder, 10 .Fixing screw, 11. Stainless steel ball, 12. Pull wire, 13. Thumb screw, 14. Winder, 15. Battery, 16. Geared motor, 17. Remote control circuit board, 18. Remote control.

Detailed ways

As shown in Figure 1: the bracket 1 is composed of three plates that are movably connected, and the bracket 1 is fixed on the base 2 with thumb screws 13 to form a square frame; the installation box 7 is placed in the center of the square frame, and the installation box 7 is used in the cylinder below the box. Fix the lower shaft 6 with screws, the other end of the lower shaft 6 is placed on the support bearing 3 on the base 2, the upper shaft 5 is fixed with screws in the cylinder above the installation box 7, and the other end of the upper shaft 5 passes through the fixing hole on the bracket 1 4. Fix the left horizontal cylinder 9 with screws in the left cylinder of the installation box 7. The angle between the left horizontal cylinder 9 and the horizontal direction is 5 ^o . In the right cylinder of the installation box 7, fix the right horizontal cylinder with screws cylinder 8, the angle between the right horizontal cylinder 8 and the horizontal direction is 5 ^o , and a fixing screw 10 is installed on the top of both sides of the left horizontal cylinder 9 and the right horizontal cylinder 8; the midpoint of the pull wire 12 is fixed on the winding On the device 14, the left and right ends of the stay wire 12 are respectively connected with the pull rings on the two stainless steel balls 11, and the two stainless steel balls 11 are respectively placed in the left horizontal cylinder 9 and the right horizontal cylinder 8.

As shown in Figure 2: the wire winder 14 is installed in the inner cavity of the installation box 7, and one end of the wire winder 14 is fixed through the hole at the back of the installation box 7, and the other end is connected with the rotating shaft of the reduction motor 16 in the front of the installation box 7; Geared motor 16 is fixed on the front top of the installation box 7 inner cavity with screws, battery 15 boxes are screwed on the back of the installation box 7 inner cavity, and the remote control circuit board 17 is screwed on the front and lower side of the installation box 7 inner cavity. The positive and negative poles of 15 are connected with the positive and negative poles of the remote control circuit board 17, and the output end of the remote control circuit board 17 is connected with the input end of the reduction motor 16. The remote control circuit is a small remote control switch RK04C-12 type. Motor parameters are as follows: Diameter: 12mm, body excluding shaft length: 26mm Shaft length 10mm Diameter 3mm Both sides milled plane 0.5mm Voltage working range: DC1.5- 12V.

As shown in Figure 3: the remote controller 18 matches the remote control circuit board 17, and the remote control deceleration motor 16 rotates.

The upper rotating shaft 5 and the lower rotating shaft 6, the left horizontal cylinder 9 and the right horizontal cylinder 8 and the stainless steel ball 11 in the cylinder are installed outside the installation box 7; the winding device 14, the pull wire 12, the battery 15, the reduction motor 16 and the remote control circuit Plate 17 is installed in the inner cavity of mounting box 7, and the two parts are connected with mounting box 7 as a whole to form the rotating part of the conservation of angular momentum; the upper rotating shaft 5 of the rotating part passes through the fixing hole 4 on the bracket 1, and the rotating part The lower end of the lower rotating shaft 6 is placed on the support bearing 3 on the base 2 .

Push the rotating part to rotate by hand, then use the remote control 18 to remotely control the deceleration motor 16 to rotate, wind the pull wire 12, pull the stainless steel ball 11 close to the rotating shaft, the moment of inertia of the rotating part will decrease, according to the law of conservation of angular momentum, the rotational speed of the rotating part Will increase; remote control deceleration motor 16 reverse rotation, under the effect of centrifugal force and sliding component force, stainless steel ball 11 is away from rotating shaft, the moment of inertia of rotating part increases, according to the law of conservation of angular momentum, the rotational speed of rotating part can reduce.

Claims (2)

1. The portable angular momentum conservation instrument is composed of a bracket, a base, a rotating shaft, a horizontal cylinder, an installation box, a stainless steel ball, a pull wire, a deceleration motor, a battery, a remote control circuit board and a remote control. The characteristics are: the bracket (1) consists of It is composed of three movable plates, and the bracket (1) is fixed on the base (2) with thumb screws (13) to form a square frame; the installation box (7) is placed in the center of the square frame, and the installation box (7) is placed in the lower cylinder Fix the lower shaft (6) with screws, place the other end of the lower shaft (6) on the support bearing (3) on the base (2), fix the upper shaft (5) with screws in the cylinder above the installation box (7), The other end of the rotating shaft (5) passes through the fixing hole (4) on the bracket (1); fix the left horizontal cylinder (9) with screws in the left cylinder of the installation box (7), the left horizontal cylinder (9) and The downward angle in the horizontal direction is ^5o . In the right cylinder of the installation box (7), fix the right horizontal cylinder (8) with screws. The downward angle between the right horizontal cylinder (8) and the horizontal direction is ^5o . Install a fixing screw (10) on the top of both sides of the left horizontal cylinder (9) and the right horizontal cylinder (8); the wire winder (14) is installed in the inner cavity of the installation box (7), and the wire winder (14) One end is fixed through the hole at the back of the installation box (7), and the other end is connected to the rotating shaft of the geared motor (16) in the front of the installation box (7); the midpoint of the pull wire (12) is fixed on the winding device (14) , the left and right ends of the pull wire (12) are respectively connected to the pull rings on the two stainless steel balls (11), and the two stainless steel balls (11) are respectively placed on the left horizontal cylinder (9) and the right horizontal cylinder ( 8), the deceleration motor (16) is fixed on the upper front of the inner cavity of the installation box (7) with screws, the battery (15) box is fixed on the lower back of the inner cavity of the installation box (7) with screws, and the remote control circuit board (17) Fix it on the lower front of the inner cavity of the installation box (7) with screws, connect the positive and negative poles of the battery (15) to the positive and negative poles of the remote control circuit board (17), and connect the output terminal of the remote control circuit board (17) to the geared motor (16 ) to the input connection. 2. The portable angular momentum conservation instrument according to claim 1, characterized in that: the upper shaft (5) and the lower shaft (6), the left horizontal cylinder (9) and the right horizontal cylinder (8) and stainless steel inside the cylinder The small ball (11) is installed outside the installation box (7); the wire winder (14), pull wire (12), battery (15), geared motor (16) and remote control circuit board (17) are installed in the installation box (7) The inner chamber of the two parts is connected with the installation box (7) to form a whole to form the rotating part of the conservation of angular momentum; the remote controller (18) is matched with the remote control circuit board (17), and the remote control deceleration motor (16) rotates.

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