CN102706744B

CN102706744B - Optical lever for tensile Young's modulus measurement

Info

Publication number: CN102706744B
Application number: CN201210179590.XA
Authority: CN
Inventors: 胡再国; 何原; 王维果
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2012-06-04
Filing date: 2012-06-04
Publication date: 2014-03-26
Anticipated expiration: 2032-06-04
Also published as: CN102706744A

Abstract

An optical lever for a tensile Young's modulus measurement relates to the field of physical quantity measurement equipment. The optical lever for the tensile Young's modulus measurement is not easy to position during measurement, and as a result, the precision of a vernier caliper is not ideal when the vernier caliper is in use. In order to eliminate the inconvenience in the Young's modulus measurement, the optical lever is fixed on a wire. The technical scheme adopted by the invention is as follows: a metallic cylinder with a broken middle part is located at the upper part of a trapezoidal metal frame with 10 cm height; a metal column with a through-hole at the middle part thereof can penetrate the wire, and is further provided with a threaded hole; the metal cylinder can rotate around the metal column; and a trapezoid plane mirror is fixed on the trapezoid metal frame, a wheel is located at the bottom of the plane mirror, wherein the diameter of the wheel is 10 mm, and a calibration ring is located on a table board on which the wheel is located. The invention has the benefits of simplicity in measurement and convenience in operation.

Description

The optical lever that a kind of drawing Young modulus is measured

Technical field

The present invention relates to physical amount measuring device field, the optical lever that particularly tinsel Young modulus is used in measuring.

Background technology

Optical lever in drawing Young modulus measurement is to be fixed on a metal support, originally need to measure the rear foot of optical lever to the distance of minute surface, but be generally all reduced to the distance of the rear foot to two forward foot in a step of measuring optical lever, if the line of two forward foot in a step is not in minute surface, can cause measurement to have larger error, and the pin of optical lever is thicker, the contact point causing is larger, when measuring, contrast locating is more difficult, does not reach the precision of vernier caliper while causing using vernier caliper measurement.

In order to reduce the friction between tinsel chuck and table top through hole, between chuck wiry and through hole, generally there are some spaces, the rear foot of optical lever to fall into space and will cause measurement above to be cancelled.

Summary of the invention

The trouble of measuring for overcoming Young modulus optical lever, the present invention is fixed on optical lever on tinsel.

The technical scheme that the present invention solves its technical matters employing is:

The trapezoidal metal frame of a height 10cm, a metallic cylinder is arranged at the top of trapezoidal metal frame, and the middle part of metallic cylinder disconnects and makes metallic cylinder be divided into two parts.

A metal cylinder, there is a through hole centre, can pass tinsel, and metal cylinder has a threaded hole metal column to be fixed on tinsel by screw, and metallic cylinder can be rotated around metal cylinder.

Level crossing is fixed in trapezoidal metal frame, and level crossing presents trapezoidal, trapezoidal height 6cm, bottom width 5cm, upper width 4cm.

A wheel is arranged at level crossing bottom, the diameter 10mm of wheel, and the residing table top of wheel has scale annulus.

A diaphragm is arranged at scale bottom, and the diameter of diaphragm is 1mm, and the laser that laser instrument sends is irradiated to level crossing through diaphragm, then from flat mirror reflects to scale.

The invention has the beneficial effects as follows: measure simple, easy to operate.

Accompanying drawing explanation

Fig. 1 is optical lever schematic diagram (front elevation).

Fig. 2 is optical lever schematic diagram (side view) and scale.

Wherein, 1, tinsel, 2, trip bolt, 3, metal column, 4, metallic cylinder, 5, trapezoidal metal frame, 6, level crossing, 7, wheel, 8, calibration loop, 9, scale, 10, diaphragm, 11, laser instrument.

Embodiment

Trapezoidal metal frame 5 height 10cm, a metallic cylinder 4 is arranged at the top of trapezoidal metal frame, the middle part of metallic cylinder disconnects and makes metallic cylinder be divided into two parts, a metal column 3, there is a through hole centre, can pass tinsel 1, have a threaded hole tinsel to be fixed on metal column by screw 2, metallic cylinder 4 can with around metal cylinder 3 rotation.

A point of fixity of tinsel 1 is in the position of trip bolt 2, and in the above, the length of two fastening point is exactly effective length wiry to another fastening point.

Level crossing 6 is fixed in trapezoidal metal frame 5, and level crossing presents trapezoidal, trapezoidal height 6cm, bottom width 5cm, upper width 4cm, and a wheel 7 is arranged at level crossing bottom.

The diameter 10mm of wheel 7 .

Scale 9 is 1000mm with the distance of tinsel 1.A diaphragm 10 is arranged at scale bottom, and the diameter of diaphragm is 1mm, and the laser that laser instrument 11 sends is irradiated to level crossing from diaphragm 10.

Calibration loop 8 is the annulus centered by the tinsel of table top, between annulus equidistantly, for estimating that wheel arrives distance wiry, in experiment, can practical vernier caliper measurement tinsel to the distance of wheel.

The radius 5mm(that original state allows wheel subcenter and distance wiry be wheel is that wheel is close to tinsel), wheel is trapezoidal metal frame height 10cm=100mm to the distance of point of fixity, and initial angle is roughly 5mm/10cm=1/20.When weight is drop-down, cause the elongated delta L of tinsel, cause accordingly the outside mobile delta r of wheel, 100 ²+ 5 ²=(100+delta L) ²+ (5+delta r) ²so, the variable quantity delta r/L=20 delta L/L of angle; Angle causes the light spot position of laser on scale to change after changing, if the distance that luminous point changes is delta x, because tinsel moves down, cause level crossing to move and normal direction is changed, thereby the differential seat angle between reflection angle and incident angle is 2delta r/L=40delta L/L, if the distance of laser distance minute surface is D, the distance that laser spot moves is delta x=2delta r/L*D=40delta L/L*D, the present embodiment suggestion L=10cm, D=1000mm, delta x=400delta L.

In experiment, to first add 1 or 2 counterweights, observe reflex to scale laser spot whether can on move, if not can, show that table top is too low, wheel does not also contact table top, table top will on move a bit; If movement has occurred luminous point, wheel contacts with table top well, can record luminous point reading now, then increases counterweight, observes the movement of luminous point.

Claims

1. the optical lever that drawing Young modulus is measured, comprise trapezoidal metal frame, metal column, level crossing, wheel, it is characterized in that: trapezoidal metal frame height is 10cm, a metallic cylinder is arranged at the top of trapezoidal metal frame, and the middle part of metallic cylinder disconnects and makes metallic cylinder be divided into two parts; A metal column, there is a through hole centre, can pass tinsel, has a threaded hole, by screw, metal column is fixed on tinsel, and metallic cylinder can be rotated around metal column; Level crossing is fixed in trapezoidal metal frame, and level crossing presents trapezoidal, trapezoidal height 6cm, bottom width 5cm, upper width 4cm, and a wheel is arranged at level crossing bottom; The diameter 10mm of wheel, the residing table top of wheel has scale annulus.