CN202994600U

CN202994600U - Extensometer for griping samples of different specifications

Info

Publication number: CN202994600U
Application number: CN 201220688043
Authority: CN
Inventors: 汪涛; 罗屏; 周燕; 李纯朴; 李建华; 赵亮; 段开会; 曹秋野
Original assignee: Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
Current assignee: Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
Priority date: 2012-12-13
Filing date: 2012-12-13
Publication date: 2013-06-12
Anticipated expiration: 2022-12-13

Abstract

The utility model provides an extensometer for griping samples of different specifications. The extensometer comprises two cutter rests which are arranged symmetrically, and cutters arranged at the upper end of each cutter, wherein the lower ends of the cutter rests are connected with resistance strain gauges which are electrically connected with signal converters through leads. The extensometer is characterized in that each cutter rest is provided with a pressure bar, one ends of the pressure bars are fixed on one sides of the cutter rests, and the other ends of the pressure bars are hung on the other sides of the cutter rests. The samples of different specifications can be placed on the extensometer conveniently according to needs, and then are reliably fixed by the movable connection of the pressure bars with different through holes and pins inside the through holes, so that mechanical properties of residual elongation strength, plastic elongation strength, overall elongation strength or the like can be measured through the extensometer, not only is loading and gripping efficiency of the extensometer greatly improved, but also the condition of improper tension control is effectively prevented so as to ensure accuracy of a measured data result.

Description

The extensometer of clamping different size sample

Technical field

The utility model relates to a kind of extensometer, and particularly a kind of extensometer of energy stable holding different size sample, belong to test servicing unit technical field.

Background technology

Extensometer is mainly used in measuring remaining extension strength, the plastic elongation intensity of material, and the mechanical property such as overall elongation intensity, whether reaches the regulation requirement to judge this material.When the extensometer indices all meets relevant criterion or requires, determine whether its measurement result is accurate, to be decided by the correct clamping of extensometer.The extensometer installation way that uses at present mostly adopts bungee to fix, can be improper because of the tensile force control of bungee in clamping process, and cause the extensometer edge of a knife to damage, perhaps cause the extensometer clamping not firm.These problems all can cause the measurement data deviation, directly affect measurement result.When particularly the less circular specimen of diameter being measured, above-mentioned situation is particularly protruded.Therefore be necessary prior art is improved.

Summary of the invention

Adopt bungee as the tensioning stationary installation for solving existing extensometer fixture, the clamping that brings is firm and affect the problem of measuring accuracy, and the utility model provides a kind of extensometer of energy clamping different size sample.

The utility model is completed by following technical proposal: a kind of extensometer of clamping different size sample, comprise symmetrically arranged two knife rests, be located at the cutter of each knife rest upper end, the knife rest lower end is connected with resistance strain gage, and resistance strain gage is electrically connected to signal converter by wire, it is characterized in that each knife rest is provided with depression bar, depression bar one end is fixed on knife rest one side, the depression bar other end is hooked in the knife rest opposite side, in order to sample to be tested is positioned on two cutters, and is fixed with two depression bars respectively.

Described depression bar one end is made as threaded bending end, and this bending end passes through hole corresponding on knife rest and is connected with nut, so that depression bar one end is fixed on knife rest.

The described depression bar other end is established crotch, and this crotch is matched with the latch of being located in the knife rest through hole, to realize the flexible connection of the depression bar other end and knife rest.

Described knife rest is provided with a plurality of through holes arranged side by side, inserts latch in through hole, in order to select the through hole of different distance according to the diameter of sample, and by the latch compression column with fixed in through hole.

Described knife rest comprises upright leveling board, and with the vertical plate that is connected in the middle part of leveling board, vertical plate lower end and electronics strain contact switch are matched.

The utlity model has following advantages and effect: adopt such scheme, can be easily as required, the sample of different size is placed on extensometer, again by the flexible connection of depression bar from different through hole and the latch in through hole, sample is fixed reliably, can pass through extensometer, measure remaining extension strength or the mechanical properties such as plastic elongation intensity or overall elongation intensity of sample, not only greatly improved the clamping efficient of extensometer, and effectively avoided occurring tensile force and control situation generation improperly.Thereby guaranteed the accuracy of the data result of surveying.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the A-A view of Fig. 1;

Fig. 3 is the vertical view of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described further.

as Fig. 1, Fig. 2, Fig. 3, the extensometer of the clamping different size sample that the utility model provides, symmetrically arranged two knife rests are arranged, this knife rest comprises upright leveling board 1, the swash plate 9 that is connected with leveling board 1 middle part, swash plate 9 lower ends and one group of resistance strain gage 8 are matched, resistance strain gage 8 is electrically connected to signal converter by wire 7, be located at the cutter 3 of each knife rest upper end, each knife rest is provided with depression bar 2, these depression bar 2 left ends are made as threaded bending end 21, this bending end 21 passes through hole corresponding on the upright leveling board of knife rest 1 and is connected with nut 10, so that depression bar 2 left ends 21 are fixed on knife rest, depression bar 2 right-hand members are established crotch 22, and this crotch 22 is matched with the latch 5 of being located in the knife rest through hole, to realize the flexible connection of depression bar 2 right-hand members 22 and knife rest, knife rest is provided with two through holes arranged side by side 6, insert latch 5 in through hole, in order to select the through hole of different distance according to the diameter of sample, again by latch 5 compression column with fixed 2 in through hole 6, be provided with support limit bar 11 between two knife rests, the two ends of support limit bar 11 are respectively equipped with bolt 12, carry out spacing with the movement of cutter setting frame.

During work, sample 4 is put on two cutters 3, and be fixed on cutter 3 by two depression bars 2, stretched by the power F at two ends when sample and during elongated attenuating, cutter 3, depression bar 1 and knife rest top are thereupon to two outer side shiftings, the knife rest lower end is moved to the inside and is contacted with resistance strain gage 8 and produce deformation signal, namely transmit deformation signal in the sample drawing process by wire 7 to signal converter, the final mechanical properties such as remaining extension strength, plastic elongation intensity or overall elongation intensity that obtain sample are as Fig. 2.

Claims

1. the extensometer of a clamping different size sample, comprise symmetrically arranged two knife rests, be located at the cutter of each knife rest upper end, the knife rest lower end is connected with resistance strain gage, resistance strain gage is electrically connected to signal converter by wire, it is characterized in that each knife rest is provided with depression bar, depression bar one end is fixed on knife rest one side, and the depression bar other end is hooked in the knife rest opposite side.

2. the extensometer of clamping different size sample according to claim 1, is characterized in that described depression bar one end is made as threaded bending end, and this bending end passes through hole corresponding on knife rest and is connected with nut.

3. the extensometer of clamping different size sample according to claim 1 is characterized in that the described depression bar other end establishes crotch, and this crotch is matched with the latch of being located in the knife rest through hole.

4. the extensometer of clamping different size sample according to claim 1, is characterized in that described knife rest is provided with a plurality of through holes arranged side by side, inserts latch in through hole.

5. the extensometer of clamping different size sample according to claim 1, is characterized in that described knife rest comprises upright leveling board, and with the vertical plate that is connected in the middle part of leveling board, vertical plate lower end and electronics strain contact switch are matched.