CN86201821U

CN86201821U - Combined teaching equipment for mechanics practice

Info

Publication number: CN86201821U
Application number: CN 86201821
Authority: CN
Inventors: 盛兴华
Original assignee: YONGDENG TEACHING EQUIPMENT PLANT GANSU
Current assignee: YONGDENG TEACHING EQUIPMENT PLANT GANSU
Priority date: 1986-03-28
Filing date: 1986-03-28
Publication date: 1987-07-29

Abstract

The utility model relates to combined teaching equipment for mechanics experiments, particularly combined teaching equipment for kinematics, dynamics and mechanical vibration experiment demonstrations in middle schools, which is mainly composed of an electromagnetic vibration timing recorder which can move and record motion state on a guide track. The utility model assembled in different ways can demonstrate 32 mechanics experiments. The utility model has the characteristics of simple structure and convenient operation, can repeatedly demonstrate the mechanics experiments for multiple times, is easy to obtain data, is visual, etc. The accuracy of utility model is within 5 percent, and the utility model is suitable for mechanics demonstration experiments in middle schools.

Description

Combined teaching equipment for mechanics practice

The utility model is the combined appliance for teaching that is used for middle school kinematics, dynamics, mechanical vibration experimental demonstration.

Because the existence of frictional resistance makes that the teaching aid of experiments such as kinematics, dynamics, mechanical vibration is many can not obtain promising result in the physics experiment teaching, and a kind of teaching aid do test limited.The air track that uses also needs distribution source, timer, photogate simultaneously at present, and terms are expensive, maintenance is inconvenient, mechanical noise is big, experimental period is long.

The device recording chart can only be done motion in one dimension when electromagnetism was got ready, and this teaching aid is being done two-dimensional motion when experiment, and recording chart rotates and just can write down out the two-dimensional motion wavy line.

The purpose of this utility model just provides a kind ofly can do a plurality of Experiments of Machanics, simple in structure, experimental period is short, can repeatedly repeat, data obtain combined appliance for teaching easily.

Utilize moving object at the utmost point in the short time, the not too high object frictional resistance of speed influences distant characteristics to moving object on quite short distance, and take resistance balance, then can in the scope of certain precision, directly verify these mechanics theorems with experimental data.

Teaching aid provided by the utility model, mainly comprise (seeing Fig. 1 (a) and (b), (c)): two guide rails that are parallel to each other (1), a rod (1-6) of stable support, support (1-5), a recording scoring table of confession (1-4), the dolly (2) that has 4 rollers is in order to move on guide rail, and an electric and magnetic oscillation timing register is contained in the dolly, and occupying the below has a recording pointer (2-1) to contact on the coil paper of scoring table.220 volts alternating current fades to 6～9 volts through transformer, (Fig. 1 a) to input to the timing register through guide rail, or directly import dolly Fig. 1 (b) by lead, or by dry cell through inverter power supply Fig. 1 (c), when moving of car, recording pointer in the register marks a vibrational waveform line on paper, the cycle decides according to using supply frequency.

By (1-2), (the recording chart wheelwork that 1-3, (1-4) form can be finished the record that two-dimensional motion is tested.

Electric and magnetic oscillation timing register (see figure 2) includes solenoid (1), permanent-magnet steel (2) (or electromagnet), vibrating reed (3) and base (5) and recording pointer formations such as (4).The motion state that the wavy line representative is different, various physics theorems, formula is verified by the wavelength of measured waveform line.

For improve precision, the influence of the resistance of reducing friction, a dolly and a Weight box are joined by fixed pulley with stay cord, the counterweight of increase and decrease in the Weight box, can make its resistance reach balance.If the wavy line wavelength is identical, then be the performance of resistance balance.

This teaching aid has seven kinds of fit, can do 32 kinematicss, dynamics altogether, the mechanical vibration experiment, and its precision is in 5%.

Drawings and Examples

Fig. 3 mainly comprises: guide rail (1), connect the binding post (1-1) of power supply, and rotate the rocking handle (1-2) of reel, change reel (1-3), scoring table (1-4), track base (1-5), hold-down bars (1-6), regulate the adjusting silk (1-7) of guide rail level, the electric and magnetic oscillation timing register dolly (2) of holding concurrently, recording pointer (2-1), fixed pulley (1-8), stay cord (2-2), Weight box that the balance resistance is used and counterweight (2-3) and power supply wiring (11).This fit is mainly in order to verify at the uniform velocity direct motion, speed change direct motion, average velocity, instantaneous velocity, acceleration, uniformly accelrated rectilinear motion, check weighing power acceleration g, checking Newton second law.

Fig. 4 takes down Weight box for to assemble a dolly (2) again on Fig. 3 basis.In order to checking Newton third law, elastic collision, perfect inelastic collision.

Fig. 5 is the same with Fig. 3 structure, is support one end device, one height adjustment mechanism (112), is used for inclined plane method check weighing power acceleration g, the theorem of momentum experiment of the law of conservation of mechanical energy, constant force.

Fig. 6 is on the basis of Fig. 3, adorns an arc track (4-1) in guide rail one end, and (7) are the knuckle stand (7) on the fixing curved track, and the bullet (10) of known speed is provided, and is equipped with on dolly and is subjected to cylinder (5) accordingly.The conversion of checking kinetic energy and potential energy.

Fig. 7 is on the basis of Fig. 3, adorns a transmitter (6) at guide rail one end, and in order to the emission bullet, the frame of knuckle (7) is used for fixing transmitter and uses.Still adorn one on the dolly and be subjected to cylinder (5).In order to survey velocity of shot.

Fig. 8 is on the basis of Fig. 4, and transmitter (6) is contained on the dolly, directly does recoilo experiment.

Fig. 9 is on the basis of Fig. 3, takes down Weight box, and the dolly two ends join two springs (8) matches in the knuckle stand (7) at guide rail two ends and the commentaries on classics paper of commentaries on classics reel, forms its unique experimental technique.In order to doing mechanical vibration experiments, the checking simple harmonic oscillation, survey spring equivalent mass and elasticity coefficient, the proving period formula, damped vibration, forced vibration and resonance, vibration are synthetic, the experiments such as energy conservation in the simple harmonic oscillation.

Claims

1, a kind of dolly (2) that is equipped with, scoring table (1-4), guide rail (1), resistance balance device (2-3), electric supply installation (11), the mechanics combined appliance for teaching of support is characterized in that timer is an electric and magnetic oscillation timing register (2), be contained on the dolly, register is recording pointer (2-1) (see figure 3) that can mark wavy line on recording chart.

2, combined appliance for teaching according to claim 1 is characterized in that also having one to cooperate the recording chart wheelwork (1-2) of doing the two-dimensional motion experiment, (1-3), (1-4) (Fig. 3).

3, combined appliance for teaching according to claim 2 is characterized in that being equipped with on the guide rail two same dolly (see figure 4)s.

4, combined appliance for teaching according to claim 1 is characterized in that support one end also has an adjustable height regulating device 12(to see Fig. 5).

5, combined appliance for teaching according to claim 1 is characterized in that guide rail one end adorns a transmitter 6 that launches bullet, is equipped with one on the dolly and is subjected to cylinder 5(to see Fig. 7).

6, combined appliance for teaching according to claim 1 is characterized in that guide rail one end fixes an arc track (4-1) of placing bullet, and device one is subjected to cylinder 5(to see Fig. 6 on the dolly).

7, combined appliance for teaching according to claim 3 is characterized in that a dolly on the guide rail is equipped with transmitter 6, is equipped with on another dolly and is subjected to cylinder 5(Fig. 8).

8, combined appliance for teaching according to claim 2 is characterized in that dolly two ends connection springs (8) are in knuckle stand (7) (see figure 9) at guide rail two ends.