CN2190812Y

CN2190812Y - Multipurpose rigid-body rotation experiment instrument

Info

Publication number: CN2190812Y
Application number: CN 93218436
Authority: CN
Inventors: 刘璞
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-12
Filing date: 1993-07-12
Publication date: 1995-03-01
Anticipated expiration: 2003-07-12

Abstract

The utility model relates to a multipurpose rigid body rotation experimental instrument. The multipurpose rigid body rotation experiment instrument is a demonstrating and student grouping experimental instrument used for carrying out the teaching about 'General Physics' and opening courses about 'Physical Experiment' in universities and colleges. The utility model is composed of a triangular base, a cone pulley, a pulley support frame, a pulley wheel, a photoelectric threshold, a leveling screw, a pawl spring, etc. When the experiment is carried out, a fine line is coiled on the cone pulley, and the other end of the thin line, stepping over the pulley wheel, is connected with a weight barrel; the outlet wire of the photoelectric threshold is connected with a digital timer. The instrument is also provided with accessories such as a level transverse rod, a cylindrical heavy object, a disc, a circular ring, etc. The instrument combines the functions of a torsion pendulum, a three-wire pendulum and a rigid body rotation experimental instrument into integration. The utility model has the advantages of multiple functions, high measuring precision and lucid principles. The multipurpose rigid body rotation experimental instrument is a novel product which can be used for researching rules about the rigid body rotation and measuring the moment of inertia.

Description

Multipurpose rigid-body rotation experiment instrument

How to belong to instruments used for education, mainly supply institution of higher education's " general physics " and " Physical Experiment " course to make lecture experiment and student experiment in group with solid moment experimental device.

At present, studying Rigid Body in Rotation With both at home and abroad and measure the instruments used for education of solid moment of inertia, mainly is three kinds: promptly rock, three string pendulums and solid moment experimental device.With rock, the principle of the moment of inertia of three string pendulum survey gardens dishes, garden ring is that to do cycle of angle harmonic motion according to rigid body relevant with the moment of inertia of rigid body, and the content of angle harmonic motion, in " general physics " course, generally do not say, when student's grouping experimentizes, must spend the more time to mend and say relevant knowledge, the student is difficult to accept, solid moment experimental device, can demonstration explain ABCs such as law of rotation, measure the moment of inertia of cone pulley system, but can not mensuration garden dish, garden ring etc. has the moment of inertia of the rigid body of typical meaning.And use the stopwatch timing, measuring accuracy is not high, thereby the part that all comes with some shortcomings.

The purpose of this utility model be to provide a kind of integrate rock, the function of three string pendulums, solid moment experimental device, measuring principle is simple and easy, test result can be carried out multinomial experiment of rotation of rigid accurately demonstration and grouping experiment instrument.

Basic structure of the present utility model as shown in drawings, on leg-of-mutton base (1), by ball bearing the cone pulley (2) that several different radii r are arranged is installed, above cone pulley, have the symmetrical screw (3) that horizontal cross bar can be installed, the axle top has the vertical screw (4) and the gib screw (5) of energy installation garden dish, right-hand pulley bracket (6) and the pulley (7) of being equipped with at base (1), fixing and the adjusting lifting with lock-screw (8), the vertical bar of pulley bracket is formed by connecting by two sections, there is spacing to be the scale mark of 5cm, dismantled and assembled.On this vertical bar, photoelectricity door frame (9) and (10) are installed.One viewport is arranged, the center of its center and photogate (11) on the photoelectricity door frame.The axis of gib screw (12) is on same horizontal line, pass through viewport, to determine the tram of photogate, on cone pulley,, link to each other with counterweight bucket (14), when the counterweight bucket falls by pulley (7) around a fine rule (13), by fine rule rigid system is applied external force T, the pulley bracket liftable is to guarantee can to keep vertical with OO ' when fine rule during around the different radii of cone pulley.At the base left two base levelling bolts (15) are arranged,, observe,, base leveling is described then if vertically fine rule be able to align the photogate center from positive and right side with the vertical part that ocular estimate is observed fine rule (13).Pawl spring (16) is arranged below cone pulley, and pawl spring contacts with the cone pulley below at ordinary times, and the counterweight bucket hangs over any position, and cone pulley can not rotate, and presses pawl spring (16), and counterweight could drive cone pulley and rotate.Cone pulley is installed on the triangle base (1), and is with set nut (17) locking, dismantled and assembled.

This instrument also has following accessory, so that leave kinds of experiments:

1, two of graduated horizontal cross bars, scale spacing are 2cm.

2, cylindrical weight is four, and two is low-carbon steel material, and two is aluminium, and volume is identical, the quality difference.

3, the garden dish is one.

4, the garden ring is one.

5, solid Cylinder is two.

6, lubricating oil is one bottle.

The photogate of this instrument is made up of with J0201-I type digital timer an infraluminescence pipe 5GL and a phototriode 3DV5 and is connected timing, also need use vernier caliper, day gentle counterweight during experiment.

Characteristics of the present utility model are: technology and experimentize when (1) adopts advanced photoelectrometer with the method for figure line deal with data, and accurate timing has been eliminated because the systematic error of moment of friction generation, and measuring accuracy is higher; (2), according to the Rigid Body in Rotation With theorem and by the slope survey garden of m-1/t2 figure line dish, garden ring and arbitrary physique to the dead axle moment of inertia, it is abstruse to have replaced theory, rock with the usefulness that " general physics " teaching material disconnects, the method for Moment of Inertia Surveyed by Three-Wire Pendulum, avoided loaded down with trivial details explanation, can deepen understanding and the grasp of student emphasis knowledge to experimental principle; (3), multiple functional, one-object-many-purposes: this instrument can be demonstrated explanation: the Rigid Body in Rotation With theorem; The relation of solid moment of inertia size and rigid body quality, mass distribution, rotating shaft position; Checking parallel axis theorem, this instrument can supply student experiment in group; Measure the moment of inertia of cone pulley system, garden dish, garden ring and arbitrary physique.

Claims

1, use solid moment experimental device, its basic structure is more:

Cone pulley (2) and pulley bracket (6) are installed on triangle base (1); The cone pulley main shaft locks with hand wheel type nut (11); Pulley bracket is fixing and adjusting lifting with lock-screw (8); Ball bearing is installed in the cone pulley; The cone pulley top has a pair of horizontal screw (3), top that vertical screw (4) and gib screw (5) are arranged; There is pulley (7) in pulley bracket the place ahead; The vertical bar of pulley bracket is formed by connecting by two sections, and it is the scale mark of 5cm that spacing is arranged; Two photoelectricity door frames (9) and (10) are installed on this vertical bar, photogate (11), gib screw (12) and viewport are housed on the photoelectricity door frame, this three center is on same horizontal line; Be wound with fine rule (13) on the cone pulley, stride across pulley and link to each other with counterweight bucket (14); There are a gib screw and two levelling bolts (15) in the base below; There is pawl spring (16) cone pulley below, and pawl spring contacts with the cone pulley below at ordinary times, presses pawl spring, counterweight can drive the cone pulley rotation by fine rule; It is characterized in that vertical screw and gib screw being arranged at the cone pulley top.

2, as claimed in claim 1 use solid moment experimental device more, it is characterized in that: on the vertical bar of pulley bracket, two photoelectricity door frame and photogate that are connected with digital timer are installed.

3, many solid moment experimental devices of use as claimed in claim 1, its feature in: on the vertical bar of pulley bracket scale mark is arranged, the viewport that can determine the photogate position is arranged on the photoelectricity door frame.

4, as claimed in claim 1ly use solid moment experimental device, it is characterized in that: cone pulley and pulley bracket are installed on the same base more.

5, as claimed in claim 1ly many use solid moment experimental device, it is characterized in that: pawl spring is installed below the cone pulley.

6, as claimed in claim 1ly many use solid moment experimental device, phase to be characterised in that: set nut, the lock-screw on the pulley bracket below the cone pulley are all used hand wheel type.