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Twisting-preventive compound pendulum contacting by circular spherical grooved surface

A spherical contact and circular technology, which is applied in the field of university physics experiments, can solve the problems of poor durability of knife-edge contact and achieve the effects of increased speed, less damage and less friction

Inactive Publication Date: 2014-02-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of easy torsion in double cycloid contact and poor durability of knife-edge contact, the present invention uses spherical point contact between the pendulum rod and the hanging rod

Method used

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  • Twisting-preventive compound pendulum contacting by circular spherical grooved surface

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Embodiment Construction

[0008] The swing rod 1 of the compound pendulum is 50-80cm in length, 2cm in width, and 5mm in thickness. The hanging hole on the swing rod is designed as a round hole 2 with a diameter of 1cm, and the interval between the round holes is 2cm. Groove, the cross-section of the bottom of the ditch presents a semicircle with a diameter of 2 mm, and the suspension point of the double pendulum on the hanging rod 3 is designed as a protrusion. The relationship between the hanging rod and the protrusion is similar to a round cake worn on a cylindrical rod. The diameter of the hanging rod is 3mm, the diameter of the round cake is 8mm, the top of the cross-section of the round cake is a semicircle with a diameter of 1mm, the round cake and the semicircle are connected smoothly, and the thickness of the contact position between the round cake and the swing rod is 2mm .

[0009] When the semicircle of the circular groove of the compound pendulum is in point contact with the semicircle of ...

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Abstract

A twisting-preventive compound pendulum contacting by circular spherical grooved surface and relates to college physical test, in particular to manufacturing of a twisting-preventive pendulum. A pendulum rod in a physics lab is generally in linear contact with a hanging rod and always twists. A kind of a pendulum rod is in spot contact via a knife edge but is poor in durability. The technical scheme of the twisting-preventive compound pendulum includes that a circular hole is reserved on the pendulum rod, a circular groove is reserved at the center of the circular hole, the bottom of the cross section of the circular groove is semi-circular, a projection in the shape of a thin circular cake is formed on the hanging rod, the top of the cross section of the cake is semi-circularly formed, the diameter of the semicircular top of the hanging rod is smaller than that of the semicircular bottom of the groove of the hanging rod, so that two spherical surfaces are guaranteed to be in spot contact. The hanging rod in spherical contact is small in friction, low in abrasion and high in durability. Vertical state of the swing rod can be guaranteed and no twisting is caused due to the fact that the spherical contact is spot contact, test error is reduced, testing accuracy is increased, horizontal adjustment procedures of instruments are reduced and test speed is increased.

Description

technical field [0001] The invention relates to the field of university physics experiments, in particular to the manufacture of a twist-free compound pendulum. Background technique [0002] The pendulum and the hanging rod of the compound pendulum in the university physics laboratory are generally in line contact, and twisting often occurs due to the unevenness of the hanging rod. In addition, there is a compound pendulum pendulum that is designed to form a knife edge through conical reaming, and the knife edge forms point contact with the hanging rod. The main disadvantage is that if the point contact is really formed, the knife edge should be very sharp. If the knife edge is very sharp, it will damage the hanging rod and the knife edge. By itself, the durability of the pendulum will be greatly affected. Contents of the invention [0003] In order to overcome the disadvantages of easy torsion in double cycloid contact and poor durability of knife-edge contact, the prese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09B23/10
Inventor 胡再国雍志华罗明蓉
Owner SICHUAN UNIV
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