CN202974770U - Young modulus measurer - Google Patents

Abstract

The utility model provides a Young's modulus measuring instrument, which includes: an optical lever, a telescope, a hook and a scale, and is characterized in that: the lower end of the hook connected with the measured object is connected with a hydraulic force device, and the hydraulic force device A liquid bladder is installed at the bottom of the inner cavity of the pressure box, the lower surface of the liquid bladder contacts the bottom surface of the inner cavity of the pressure box, the upper surface of the liquid bladder contacts the pressure sensor, and the pressure sensor is in contact with two symmetrically arranged left and right protruding from the inner cavity of the pressure box. The load-bearing rod is connected, and the other end of the load-bearing rod is fixed on the beam through a fixed cap; the pressure of the liquid bag is adjusted through a hydraulic regulating valve, thereby exerting an axial tension on the measured object. The tensile Young's modulus measuring instrument of the utility model can ensure that the system is in a stable state at any time, and can flexibly and accurately select an appropriate tensile force for different measurement objects, thereby avoiding the influence of the fixed weight on the range of the test object. limit.

Description

Modulus measurer

Technical field

The utility model relates to a kind of teaching experimental equipment, specifically refers to utilize pulling method to measure the experiment instrument of Young modulus wiry, belongs to the Physical Experiment field of measuring technique.

Background technology

Under external force, the change of shape that occurs of solid becomes deformation.It can be divided into two kinds of elastic deformation and plastic deformations.In this experiment, only study wire elastic deformation, for this reason, should control the size of external force, after guaranteeing that external force is removed, the object resilient.

The simplest deformation is elongation and the shortening after tinsel is subject to external force.Metal filament length L, sectional area are S, and after application of force F, the elongation Δ L of object in elastic limit wiry, has along its length:

$E=\frac{\frac{F}{S}}{\frac{\mathrm{\ΔL}}{L}}$

We call Young's modulus of elasticity to E.In physical test, often with stripe object (as steel wire, Metallic rod etc.) elastic modulus longitudinally Young modulus.

Pulling method is to utilize hook to be fixed counterweight tinsel is applied pulling force, then utilizes optical lever amplify small elongation wiry and measure.The weak point of optical lever method tester is:

1, change at every turn that swinging all can appear in tinsel after counterbalance mass, must treat that it can measure after settling out, also therefore be subjected to environmental influence larger, some little vibrations and larger Air Flow all can impact experiment;

2, counterbalance mass is fixed, can not be according to the size of measuring object flexible choice pulling force, thus limited to a great extent the scope of measuring object.

The utility model content

In order to have solved the problem of optical lever method tester stability aspect, the utility model provides a kind of easy to operate, clear reading, measurement accurate tinsel modulus measurer.

in order to solve the problems of the technologies described above, the utility model adopts following technical scheme: a kind of modulus measurer, it comprises: optical lever, telescope, hook and scale, it is characterized in that: the hook lower end connection hydraulic pressure augmentor that is connected with measured object, the pressure cell intracavity bottom of described hydraulic amplifier device is equipped with the liquid capsule, liquid capsule lower surface contact box intracavity bottom surface, liquid capsule upper surface contacts with pressure transducer, described pressure transducer is connected with two bearing rods that stretch out the pressure cell inner chamber that are symmetrically arranged, the other end of bearing rod is fixed on crossbeam by locking cap, by the pressure of the described liquid capsule of hydraulic regulation valve regulation, thereby testee is applied axial tension.

Preferably, described pressure transducer is the resistance strain gage pressure transducer.

Preferably, described pressure transducer has the digital display liquid crystal display that shows pressure value.

The utility model is intended to improve the measuring method of optical lever system, only needs on the basis of original experimental apparatus, will be substituted with pressure transducer and hydraulic amplifier device with the boosting mechanism that counterweight consists of by hook.This instrument partly uses precision resister foil gauge compressive force sensor to coordinate the hydraulic pressure augmentor at boosting mechanism, can effectively solve the stability of instrument problem.Owing to regulating hydraulic pressure by the rotating hydraulic variable valve, make the liquid capsule that pressure cell is exerted pressure, hydraulic amplifier device fluid,matching capsule applies pulling force by hook to tested object; The resistance strain gage pressure transducer that locking cap and bearing rod hang is the gaging pressure size in real time, the system that can guarantee all is in steady state (SS) at any time, realize namely afterburning, namely measure, thereby the problem that the tested object of having avoided " counterweight ten hooks " form to cause rocks, extraneous vibration and Air Flow can not have any impact to instrument simultaneously.And can flexibly, accurately choose suitable pulling force for different measuring objects, as selecting to apply large pulling force to the large tested object of Young modulus, otherwise can select to apply little pulling force, the size of pulling force can reflect by pressure transducer intuitively, and show the pulling force size that applies by the digital display liquid crystal display, thereby avoided the fixing restriction to the tested object scope of counterbalance mass.

Description of drawings

Fig. 1 is the schematic diagram of pulling method modulus measurer of the present utility model;

Fig. 2 is the structural representation of hydraulic amplifier device in pulling method modulus measurer of the present utility model.

In figure, Reference numeral represents respectively: 1. tinsel, 2. optical lever, 3. hydraulic amplifier device, 4, scale, 5. telescope, 6. locking cap, 7. crossbeam, 8. pressure transducer, 9. digital display liquid crystal display, 10. liquid capsule, 11. pressure cells, 12. hydraulic regulating valves.

Embodiment

A kind of modulus measurer, it comprises: optical lever, telescope, hook and scale, it is characterized in that: the hook lower end connection hydraulic pressure augmentor that is connected with measured object, the pressure cell intracavity bottom of described hydraulic amplifier device is equipped with the liquid capsule, liquid capsule lower surface contact box intracavity bottom surface, liquid capsule upper surface contacts with the resistance strain gage pressure transducer with the digital display liquid crystal display that shows pressure value.Described pressure transducer is connected with two bearing rods that stretch out the pressure cell inner chamber that are symmetrically arranged, and the other end of bearing rod is fixed on crossbeam by locking cap; By the pressure of the described liquid capsule of hydraulic regulation valve regulation, thereby testee is applied axial tension.

Owing to regulating hydraulic pressure by the rotating hydraulic variable valve, make the liquid capsule that pressure cell is exerted pressure, hydraulic amplifier device fluid,matching capsule applies pulling force by hook to tested object, the system that can guarantee all is in steady state (SS) at any time, realize namely afterburning, namely measure, thus the problem that the tested object of having avoided " counterweight ten hooks " form to cause rocks, and extraneous vibration and Air Flow can not have any impact to instrument simultaneously.And can flexibly, accurately choose suitable pulling force for different measuring objects, as selecting to apply large pulling force to the large tested object of Young modulus, otherwise can select to apply little pulling force, the size of pulling force can reflect by pressure transducer intuitively, and show the pulling force size that applies by the digital display liquid crystal display, thereby avoided the fixing restriction to the tested object scope of counterbalance mass.

Claims (3)

1. a Young's modulus measuring instrument, it comprises: light lever, telescope, hook and scale, it is characterized in that: the lower end of the hook that is connected with measured object is connected with hydraulic booster, the pressure box of described hydraulic booster A liquid bag is installed at the bottom of the inner cavity, the lower surface of the liquid bag contacts the bottom surface of the inner cavity of the pressure box, and the upper surface of the liquid bag contacts the pressure sensor, and the pressure sensor is arranged symmetrically with two load-bearing rods protruding from the inner cavity of the pressure box The other end of the load-bearing rod is fixed on the beam through the fixed cap; the pressure of the liquid bag is adjusted through the hydraulic regulating valve, so as to exert axial tension on the measured object. 2. The Young's modulus measuring instrument according to claim 1, wherein the pressure sensor is a resistance strain gauge pressure sensor. 3. The Young's modulus measuring instrument according to claim 1, wherein said pressure sensor has a digital display liquid crystal screen for displaying pressure values.

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