CN200997048Y

CN200997048Y - Double-conical surface pored compound pendulum without torsion

Info

Publication number: CN200997048Y
Application number: CN 200620036202
Authority: CN
Inventors: 梁德富
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-11-10
Filing date: 2006-11-10
Publication date: 2007-12-26
Anticipated expiration: 2016-11-10

Abstract

A double conical surface non-twisting compound pendulum is provided, which is characterized in that: a swing link hole is formed by combing two conical surface holes; the taper angle of the conical surface hole is 120 degree; a junction line between the little end of the two conical surfaces is configured as a edge shape circle that is positioned at equal distance from the opening of the conical surface holes at the two sides of the swing link.

Description

Bipyramid face formula twistless compound pendulum

One, technical field

The utility model relates to the physical pendulum in the physical experiment apparatus, the particularly a kind of physical pendulum that can eliminate twisting.

Two, background technology

Present known physical pendulum is made of two parts: the one, and fork, the 2nd, support, wherein the profile of fork is a block length square metal plate, the plate upper edge longitudinal centre line dozens of manhole that distributing.In the experiment be with the borehole jack of fork on the triangular prism that is laterally settled above the support, the top in fork hole then combines with the rib of triangular prism top, after the fork lower end was pulled away from the equilibrium position and discharges, fork just began swing.According to experimental principle, this swing must be the steady swing in a kind of perpendicular, will be tending towards minimum with the error of this acceleration of gravity of measuring.Yet reality is: because the thick 5mm that reaches of fork, so the fork hole is exactly the combination of two straight lines with combining of triangular prism.Because the criterion that the vertical degree of support is regulated is the level meter that relies on a bubble chamber structure on its base, then the place one's entire reliance upon accurate installation of level meter of the accuracy of this level meter, yet because the self-defect of the level meter of this structure, so can not accurately install, even accurately install, that also only reflects the levelness of base, and do not represent the levelness of triangular prism above the support, because this wherein also relates to the accuracy that combines of combining of bracket upright post and base and triangular prism and its pedestal, for above-mentioned reasons, even the bubble in the bubble chamber is placed in the middle, but do not represent triangular prism top rib to be in level, so actual effect is: the student has spent a large amount of time that bubble is transferred to the center, and the rib of triangular prism top is also out-of-level, thereby causing the top in fork hole is not desirable line contact with contacting of triangular prism top rib, but a kind of some contact.Importantly this contact point is not in the central point on top, fork hole, but being in a certain termination that push up in the hole, the fork of Xuan Guaing just can not be in vertical state in this case, so in case swing, just occur significantly twisting inevitably, finally cause bigger measuring error.

Three, utility model content

The purpose of this utility model provides a kind of bipyramid face formula twistless compound pendulum, to improve the accuracy of measuring.

The purpose of this utility model is achieved in that the fork hole by two conical surface hole be combined intos, and the tapering in conical surface hole is 120 degree, and the joint line of two conical surface hole small ends is a blade shape circle that equates with conical surface hole, fork both sides orifice distance.

Adopt such scheme can receive following remarkable result:

1, because the fork hole has been become the joint line of two conical surfaces by original cylinder hole, though and the aperture of this junction is still identical with former aperture, yet the change of matter has but taken place its physical property: the circumference of this circle becomes a ring-type cutting edge, this ring-type cutting edge contacts with the point that just must become the hole midpoint that contacts of triangular prism top rib, fork also just must be in a kind of vertical naturally state, in case fork begins swing, just must be in the swing in a kind of perpendicular, thereby reach a kind of perfect condition, measuring error is reduced significantly.

2, the fork of this structure has not only saved the bubble chamber and the corresponding horizontal adjusting of bracket base, also can make the machining precision of each parts of support and relaxing each other in conjunction with precision, this has not only saved a large amount of adjusting time, can also reduce the manufacturing cost of support greatly.

Four, description of drawings

Fig. 1 is the sectional view of bipyramid face formula twistless compound pendulum;

Fig. 2 is the side view of Fig. 1.

Five, embodiment

See figures.1.and.2, in the making of fork, behind the drilling operating of finishing whole holes, be that 120 drill bits of spending cone angles carry out counterboring respectively to former porose two ends with head again, make the two ends in hole all become taper hole, the joint line of two conical surface hole small ends is a blade shape circle that equates with conical surface hole, fork both sides orifice distance.

Claims

1, a kind of bipyramid face formula twistless compound pendulum is characterized in that: the fork hole is by two conical surface hole be combined intos, and the tapering in conical surface hole is 120 degree, and the joint line of two conical surface hole small ends is a blade shape circle that equates with conical surface hole, fork both sides orifice distance.