CN209496524U - A three-wire pendulum on a disk - Google Patents

Abstract

The utility model discloses disks on a kind of three-line pendulum, one group of suspension point integrated positioning hole is equipped with every 120 degree of angles along upper disc radius direction on upper disk, suspension point integrated positioning hole includes through-hole first, through-hole second, through-hole third and straight line pylone, further includes the positioning that pilot pin is used for three-line pendulum suspension point.The utility model structure is simple, easy to use, is conducive to the suspension point position for changing three-line pendulum, further verifies the swaying movement regularity of three-line pendulum.

Description

A three-wire pendulum on a disc

technical field

The utility model relates to a component part of a three-line pendulum of a mechanical experiment instrument, in particular to a three-line pendulum upper disc.

Background technique

The three-wire pendulum is a commonly used physical experiment instrument for measuring the moment of inertia of an object. It generally consists of an upper disc, a lower disc, and three suspension wires connecting the upper disc and the lower disc. The period of the three-wire pendulum swinging at a small angle is In the formula, H is the vertical distance between the upper disc and the lower disc, M and J are the mass and moment of inertia of the lower disc, respectively, r and R are the suspension points of the upper disc and the lower disc to the central axis, respectively. the distance. This formula shows that the swing period T of the three-wire pendulum is closely related to the position of the suspension point of the suspension wire. However, the positions of the suspension points of the three suspension wires of the existing three-wire pendulum cannot be changed, so it is impossible to verify the influence relationship of different suspension point positions on the swing period.

Contents of the invention

The purpose of this utility model is to develop a kind of three-line pendulum top disc that can change the position of the suspension point for the above-mentioned problems of the three-line pendulum.

In order to solve the above technical problems, the utility model is realized through the following technical solutions: a three-wire pendulum upper disk, including an upper disk, the upper disk is circular, and a round hole is opened in the center of the upper disk for connecting with the three-wire The pendulum support rod is fixed, and the diameter of the round hole matches the diameter of the three-wire pendulum support rod; the upper disc is also provided with a combination of suspension point positioning holes, and there are three sets of suspension point combination positioning holes, each group of suspension point combination positioning holes All are arranged along the radial direction of the upper disk, and the angular distance between two adjacent groups of suspension point combination positioning holes is 120 degrees; the suspension point combination positioning holes include through hole A, through hole B, through hole C and straight through holes, and the The hole diameters of through hole A, through hole B and through hole C are the same. Through hole A and through hole C are arranged at both ends of the straight through hole and communicate with the straight through hole. Through hole B is arranged in the middle of the straight through hole and along the diameter of through hole B. The direction is connected with the straight through hole; it also includes positioning pins matching the apertures of through hole A, through hole B, and through hole C. There are 3 positioning pins in total, which are inserted in through hole A or through hole B or through hole C. It is used for the positioning of the suspension point of the three-wire pendulum; the center of the positioning bolt is provided with a threading hole passing through the positioning bolt along the length direction of the positioning bolt, which is used for passing the cycloid of the three-wire pendulum.

Because the utility model adopts the above-mentioned design, the suspension point position of the three-wire pendulum can be changed easily by utilizing the through hole A, the through hole B, the through hole C and the positioning bolt. For example, if you want to change the suspension point from the original position of through hole B to the position of through hole C, you can pull out the positioning pin from through hole B, move the positioning pin so that the suspension line enters through hole C along a straight line, and then move the positioning pin Just insert it into through hole C. The utility model has the advantages of simple structure and convenient use, which is beneficial to changing the position of the suspension point of the three-wire pendulum and further verifying the swing law of the three-wire pendulum.

Description of drawings

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

Fig. 1 is the composition schematic diagram of the present utility model.

Fig. 2 is a structural schematic diagram of the positioning bolt.

In the figure: 1. Upper disk, 11. Round hole, 2. Suspension point combined positioning hole, 21. Through hole A, 22. Through hole B, 23. Through hole C, 24. Straight through hole, 3. Positioning bolt , 31. Bolt head, 32. Bolt body, 33. Threading hole, 34 locking knob.

Detailed ways

As shown in FIG. 1 , a circular hole 11 is opened in the center of the upper disk 1 , and the diameter of the circular hole 11 matches the diameter of the three-wire pendulum support rod. Along the radial direction of the upper disc 1, a group of suspension point combination positioning holes 2 are arranged at intervals of 120 degrees. Suspension point combination positioning hole 2 comprises through hole first 21, through hole second 22, through hole third 23, straight line through hole 24, the aperture of through hole first 21, through hole second 22, through hole third 23 is identical, through hole first 21, The through hole C 23 is arranged at both ends of the straight through hole 24 and communicates with the straight through hole 24 , and the through hole B 22 is arranged in the middle of the straight through hole 24 and communicates with the straight through hole 24 along the diameter direction. In FIG. 1 , the positioning bolt 3 is inserted in the through hole B 22 . There are totally 3 positioning pins 3 (for seeing through hole second 22 clearly, only two positioning pins 3 are drawn in Fig. 1).

As shown in Figure 2, the bolt head 31 of the positioning bolt 3 is a flat head, the bolt body 32 is cylindrical, and the diameter of the bolt body 32 matches the apertures of the through hole A 21, the through hole B 22, and the through hole C 23. 3 The central axis is provided with a threading hole 33 passing through the positioning bolt 3 along the length direction of the positioning bolt 3, and the threading hole 33 is used for threading the cycloid of the three-wire pendulum. The vertical threading hole 33 on the side of the bolt head 31 is provided with a locking knob 34 for fixing the cycloid in the threading hole.

Claims (1)

1. a three-wire pendulum upper disc, comprising an upper disc, the upper disc is circular, and the center of the upper disc has a circular hole, and the aperture of the circular hole matches the diameter of the three-wire pendulum support rod; it is characterized in that: There are three groups of suspension point combination positioning holes on the above disc, and each group of suspension point combination positioning holes is set along the radial direction of the upper disc, and two adjacent groups of suspension point combination positioning holes The angular spacing is 120 degrees; the suspension point combination positioning hole includes through hole A, through hole B, through hole C and straight through hole, and the apertures of the through hole A, through hole B and through hole C are the same, and the through hole A, through hole C is located at both ends of the straight through hole and communicates with the straight through hole, through hole B is located in the middle of the straight through hole and connects with the straight through hole along the diameter direction of through hole B; also includes through hole A, through hole B, The positioning bolts with matching apertures of through hole C, there are 3 positioning bolts in total, inserted in through hole A or through hole B or through hole C for the positioning of the suspension point of the three-wire pendulum, the center of the positioning bolt is set along the length direction of the positioning bolt The threading hole passing through the positioning bolt is used for threading the cycloid of the three-wire pendulum.