CN2643314Y

CN2643314Y - Determinator for Young's modulus of elasticity

Info

Publication number: CN2643314Y
Application number: CN 03205927
Authority: CN
Inventors: 曾仲宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-07
Filing date: 2003-08-07
Publication date: 2004-09-22
Anticipated expiration: 2013-08-07

Abstract

The utility model relates to a new measurement meter for the Young's modulus of elasticity, which reforms the laggard method that the prior measurement meter of Young's modulus of elasticity applies the force with poises is reformed by utilizing a pneumatic force-application technology and electronic sensing and electronic display technology. When at work, the metal wire to be tested is connected with the tensile force sensor, a pneumatic force-application device converts the applied force into electric signals and the applied force is read through a digital electronic force gauge. The utility model has a compact structure, only 0.8 m in the height and 4 kg in the weight; is capable of continuously stably applying the force or reducing the force with a force range of 0-30 kg and has a precision of readings of above or below 10 g.

Description

Young's elastic modulus tester

Technical field the utility model relates to a kind of Experiments of Machanics instrument, especially for the instrument of young elastic modulus detection.

Never too big variation of the young's elastic modulus tester that the background technology Experiment of College Physics is extensively adopted has detailed introduction by " Experiment of College Physics (first volume) " that Mr. Jin Enpei etc. writes, publishing house of Harbin Institute of Technology 1998 publishes to this instrument.The afterburner system of this analyzer, structure are very simple, and promptly below the tinsel that is stretched, as afterburning mode, each counterweight is 1kg usually, adds 10 altogether with the method that directly adds counterweight.Because counterweight must take very large space, require the overall height of afterburning and stretching device support must be increased to more than the 1.7m, and then have to increase bracket base weight and area, guaranteeing the stability of support, this is that one of major reason done not only high but also heavyly by existing afterburning and stretching device support.In addition, because the uncontinuity of afterburner process is easy to generate impulsive force, often cause the system under test (SUT) vibration, tested tinsel is flexible up and down as spring, has both influenced the experiment process, brings new error again.Another major defect of existing instrument is that reheat range is too little, and experimental error is big.

Experiment on material mechanical test machine shows: to the steel wire of diameter 1.0mm, when pulling force is added to 85kg, the stress and strain curve still is in the range of linearity, but pulling force is crooked at 10kg with lower curve, and its reason is the vacation elongation that factor produces because steel wire bending of when beginning or chuck be not tight etc.As seen, it is more reasonable that the pretension of experiment should be located at 10kg, and the pretension of existing instrument is made as 3kg, total afterburning just 10kg, and this is experimental repeatability difference and the big major reason of error often to occur with existing instrument.

Summary of the invention is the defective that overcomes existing instrument augmentor, and the utility model has designed a pneumatic augmentor and replaced the afterburning mode of original counterweight.For size and the weight that reduces instrument, the size of dwindling testing sample simultaneously, the utility model adopts the light amplification tiny length measure of the change device of high sensitivity, variable enlargement factor to replace common optical lever optical amplification system.Utilize electronics dynamometric display to read afterburning size in order to determine afterburning size, the utility model easily.

During the utility model work, two ends wiry to be measured clamp with chuck, upper grip is fixed, two guide holes of optical lever catoptron placing platform are passed in the lower end of lower chuck, be connected with pulling force sensor, pneumatic augmentor is added in power on the sensor, and by electronics dynamometric display read immediately afterburning size.

The air bag of the pneumatic augmentor of the utility model and pulling force sensor are contained in the same can, gas enters air bag, volume increases, producing pressure acts on the sensor, sensor is connected mutually with tested lower chuck wiry, thereby make tinsel be subjected to pulling force, the size of this pulling force then is presented on the high-precision electronics dynamometric display.

The utility model organically combines pneumatic augmentor and electronic sensor and display technique, the total compactness, and institute takes up space little, can be afterburning continuously and stably or subtract power, reheat range can be regulated in the scope of 0～30kg.

The utility model is compared with original system and is had following improvement:

1, the utility model adopts the light amplification tiny length measure of the change device of high sensitivity, variable enlargement factor, its enlargement factor is than high several times to tens times of normal light lever amplification system, thereby make the whole instrument compact conformation, height is reduced to 0.7～0.8m from 1.7 original～1.8m, and weight reduces to about 4 kilograms by tens kilograms.

2,, eliminated the afterburning factor that causes the instrument vibration fully because pneumatic reinforcing has continuity and stability, and the utility model always works in static state or the quasistatic process.

3, the reheat range of the pneumatic augmentor of the utility model is 0～30kg, and pretension can be set in 10kg during experiment, thereby has eliminated original instrument because of the appreciable error of vacation elongation generation and the shortcoming of experimental repeatability difference, has improved the experiment quality.

4, respond sensitivity, the higher characteristics of precision of pulling force sensor and electronics dynamometric displaying appliance organically combine they and pneumatic augmentor, make the utility model that higher technology starting point and information capacity be arranged.

Description of drawings

Fig. 1 is a schematic perspective view of the present utility model;

Fig. 2 is the main diagrammatic sketch of the utility model structure;

Fig. 3 is the side diagrammatic sketch of the utility model structure;

Fig. 4 is a light measuring system synoptic diagram of the present utility model;

Fig. 5 is the pneumatic augmentor synoptic diagram of the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further.Fig. 1-3 is a structural representation of the present utility model: it mainly is made up of upper grip 1, lower chuck 2, optical lever catoptron placing platform 3, crossbeam 4, reverse push slab 5, air bag 6, pulling force sensor 7, electronics dynamometric display 9 and base 8 etc.Column 11 is welded into support of the present utility model with back timber 12, and column 11 is by being bolted on the base 8.Upper grip 1 all adopts drill chuck with lower chuck 2, and upper grip 1 is by being bolted on the back timber 12, and lower chuck 2 is connected with pulling force box 10 mutually by bolt.Afterburning air bag 6, reverse push slab 5 and pulling force sensor 7 are housed in the pulling force box 10, and air bag 6 is between reverse push slab 5 and pulling force sensor 7, and the crossbeam 4 on two bolts of reverse push slab 5 usefulness pass pulling force box 10 and are fixed on support two columns 11 is connected mutually.The digital signal that electronics dynamometric display 9 becomes can read immediately with the electrical signal conversion on the pulling force sensor 7.

Fig. 4 is a light measuring system synoptic diagram of the present utility model: it mainly is made up of LASER Light Source 21, diffactive lens 22, optical lever catoptron 23, accommodation reflex mirror group 24, scale 25 and measuring telescope 26.

Fig. 5 is the pneumatic augmentor synoptic diagram of the utility model, mainly is connected valve with three groups of self-lockings and is formed by foot-operated inflator 31, decompression cylinder 32, accurate vent valve 33, air bag 6.

During the utility model work, earlier tinsel to be measured is clamped between upper grip 1 and the lower chuck 2, then optical lever catoptron 23 is placed on the optical lever catoptron placing platform 3 of the present utility model, toe contacts with measurement end face 15 thereafter.With foot-operated inflator 31 pressure that gas is pressed into air bag 6 back generations is acted on the pulling force sensor 7, because of above the pulling force sensor 7 being the reverse push slab of fixing 5, so the acting force that whole afterburning box 10 is subjected to pushing away downwards, traction lower chuck 2 moves down, thereby realizes stretching wiry to be measured.The laser beam of sending from LASER Light Source 21 becomes a branch of superfine diffracted ray that is parallel to scale 25 through diffactive lens 22, and this diffracted ray after repeatedly reflecting, projects on the scale 25 between optical lever catoptron 23 and adjusting mirror group 24.Tiny length change transitions after stressed is the minor rotation of optical lever catoptron 23 to optical lever catoptron 23 with tinsel to be measured, and causes that laser beam after reflection repeatedly, becomes the linear change amount of amplifying hundred times, is read by measuring telescope 26 at last.

The working pressure maximal value of the pneumatic augmentor of the utility model is designed to the 250mm mercury column, and maximum pull is about 31kg.During work, pretension is set in 10kg, and each afterburning 2kg gets 10 groups of data points, and is last afterburning to 28kg.The error of pulling force sensor 7 is ± 10g that therefore testing relative error is about 1.5%.

Claims

1, a kind of mainly by by upper grip (1), lower chuck (2), optical lever catoptron placing platform (3), crossbeam (4), reverse push slab (5), air bag (6), pulling force sensor (7), electronics dynamometric display (9), the young's elastic modulus tester that light measuring system and pneumatic augmentor etc. are formed, be welded into support of the present utility model by column (11) and back timber (12), column (11) is by being bolted on the base (8), it is characterized in that: upper grip (1) all adopts drill chuck with lower chuck (2), upper grip (1) is by being bolted on the back timber (12), and lower chuck (2) is connected with pulling force box (10) mutually by bolt.Afterburning air bag (6), reverse push slab (5) and sensor (7) are housed in the pulling force box (10), air bag (6) is positioned between reverse push slab (5) and the pulling force sensor (7), and the crossbeam (4) on reverse push slab (5) passes pulling force box (10) and is fixed on support two columns (11) with two bolts is connected mutually; The digital signal that electronics dynamometric display (9) becomes can read immediately with the electrical signal conversion on the pulling force sensor (7); Light measuring system is made up of LASER Light Source (21), diffactive lens (22), optical lever catoptron (23), accommodation reflex mirror group (24), scale (25) and measuring telescope (26); Pneumatic augmentor is connected valve with three groups of self-lockings and is formed by foot-operated inflator (31), decompression cylinder (32), accurate vent valve (33), air bag (6), connects with flexible pipe between them.

2, a kind of young's elastic modulus tester as claimed in claim 1 is characterized in that: the working pressure maximal value of pneumatic augmentor is designed to the 250mm mercury column, and maximum pull is about 31kg.

3, a kind of young's elastic modulus tester as claimed in claim 1 is characterized in that: the error of pulling force sensor (7) is ± 10g.