CN214502352U

CN214502352U - Strain extensometer

Info

Publication number: CN214502352U
Application number: CN202120461843.7U
Authority: CN
Inventors: 沈程挺; 戴志辉
Original assignee: Hunan Junzhiyue Test Equipment Co ltd
Current assignee: Hunan Junzhiyue Test Equipment Co ltd
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2021-10-26
Anticipated expiration: 2031-03-04

Abstract

The utility model discloses a strain extensometer, which comprises an upper fixed arm, a lower fixed arm and a middle fixed arm, wherein the rear end of the upper fixed arm is connected with the rear end of the middle fixed arm through a first leaf spring and a second leaf spring; a gauge length block is arranged between the middle fixed arm and the lower fixed arm, the gauge length block is directly connected with the lower fixed arm through a screw and is connected with the middle fixed arm through a gauge length block seat; the upper fixing arm is provided with an upper pull rod seat and an upper push rod seat, the lower fixing arm is provided with a lower pull rod seat and a lower push rod seat, an upper pull rod is installed in the upper pull rod seat, and a lower pull rod is installed in the lower pull rod seat; an upper push rod is arranged in the upper push rod seat, a first spring is sleeved on the upper push rod, one end of the upper push rod is connected with the upper pull rod seat, a lower push rod is arranged in the lower push rod seat, a second spring is sleeved on the lower push rod, and one end of the lower push rod is connected with the lower pull rod seat; the front ends of the upper fixing arm and the lower fixing arm are respectively provided with an upper knife edge and a lower knife edge.

Description

Strain extensometer

Technical Field

The utility model relates to a sample warp measures technical field, concretely relates to be used for measuring strain type extensometer that circular sample, plate-type sample and other special-shaped sample warp.

Background

With the rapid development of the computer age in recent years, electronic extensometers have gradually occupied a place in related industries. The electronic extensometer can acquire and transmit strain signals to a main control system of the tester, so that the strain signals and the stress of the material are synchronously displayed, errors caused by artificial reading are reduced to a great extent, and the measurement accuracy is improved. The electronic extensometer can be of various types such as a resistance extensometer, a capacitance extensometer, an inductance extensometer and the like. The resistance extensometer is a resistance strain sensor and is most widely applied. The measuring principle of the resistance strain extensometer is mainly that the resistance value of a strain foil stuck on an elastic element of the extensometer changes, then the resistance value is converted into a voltage signal through a conversion circuit, and the voltage signal is collected and processed by a main control system of a testing machine to realize the measurement of the deformation of a sample.

Because the electronic extensometer is easy to be used with the electronic universal testing machine, the electronic sensor and the like in a matching and on-line manner, and has the advantages of low price, small and exquisite equipment, convenient installation and the like, the electronic extensometer is widely applied to the deformation measurement of industrial samples, and when the deformation measurement of the samples is carried out, if the extensometer has larger weight, the weight of the extensometer can cause the deformation of the samples, so that the measurement is inaccurate.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model aims at providing a compact structure, centre gripping are simple, convenient to use, the changeable answer formula extensometer of gauge length reduce the dismouting spare as far as possible when changing for other gauge lengths simultaneously for solve the inconvenient, the not changeable or loaded down with trivial details scheduling problem of dismouting of the centre gripping that current formula extensometer of pressing from both sides exists of gauge length when changing.

The utility model discloses a following technical scheme realizes.

A strain extensometer comprises an upper fixed arm, a lower fixed arm and a middle fixed arm, wherein the rear end of the upper fixed arm is connected with the rear end of the middle fixed arm through a first leaf spring and a second leaf spring; a gauge length block is arranged between the upper fixing arm and the lower fixing arm, the gauge length block is directly connected with the lower fixing arm through a screw and is connected with the middle fixing arm through a gauge length block seat, an upper pull rod seat and an upper push rod seat are arranged on the upper fixing arm, a lower pull rod seat and a lower push rod seat are arranged on the lower fixing arm, an upper pull rod is arranged in the upper pull rod seat, and a lower pull rod is arranged in the lower pull rod seat; an upper push rod is arranged in the upper push rod seat, a first spring is sleeved on the upper push rod, one end of the upper push rod is connected with the upper pull rod seat, a lower push rod is arranged in the lower push rod seat, a second spring is sleeved on the lower push rod, and one end of the lower push rod is connected with the lower pull rod seat; the front ends of the upper fixed arm and the lower fixed arm are respectively provided with an upper knife edge and a lower knife edge; a positioning pin seat is arranged between the front end of the upper fixing arm and the front end of the middle fixing arm, and the front end of the middle fixing arm is connected with the positioning pin seat through a screw; the front end of the upper fixing arm is connected with a positioning pin seat through a positioning pin.

Preferably, a limiting rope is arranged between the upper fixing arm and the middle fixing arm.

Preferably, the upper pull rod and the lower pull rod for clamping the bar sample can be replaced by replacement pull rods for clamping the plate sample, so that the deformation of the plate sample is measured.

Preferably, the upper fixing arm is connected with one end of the first leaf spring, the other end of the first leaf spring is connected with the scale distance block seat, the scale distance block seat is tightly connected with the middle fixing arm, and the upper fixing arm is connected with the middle fixing arm through the first leaf spring; one end of the second leaf spring is connected with the middle fixed arm, the other end of the second leaf spring is connected with the upper push rod seat, the upper push rod seat is tightly connected with the upper fixed arm, and the upper fixed arm is connected with the middle fixed arm through the second leaf spring.

Preferably, the first leaf spring and the second leaf spring are arranged in a crisscross mode, and a strain gauge is arranged on the second leaf spring, so that the space size of the extensometer is greatly reduced while the deformation measurement of the test sample is realized.

Preferably, the scale distance block is replaceable into scale distance blocks with different sizes, so that the scale distance is variable, and the scale distance is changed only by disassembling and assembling the scale distance block, and the disassembling and assembling are simple and easy.

Preferably, the upper knife edge and the lower knife edge are both replaceable knife edges.

Compared with the prior art, the utility model, beneficial effect lies in: the utility model provides a strain extensometer, through the upper fixed arm front end locating pin is connected with the locating pin seat, after inserting the locating pin, the extensometer is just on fixed gauge length, and if extract the locating pin, the upper fixed arm can freely move with the middle fixed arm, can realize with the synchronous deformation of the sample tested, thus realize the sample and warp and measure, and still set up the spacing rope between upper fixed arm and the middle fixed arm, in order to prevent that two arms from excessively opening and damaging the instrument when not inserting the locating pin; and simultaneously, the utility model discloses an adjustment scale distance block seat and the scale distance piece between the fixed arm down can guarantee to have accurate scale distance position between the edge of a knife on the extensometer, through changing the scale distance piece of different sizes, just can satisfy the requirement of different scale distances.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the clamping bar of the present invention.

Fig. 3 is a schematic view of the clamping plate of the present invention.

Fig. 4 is a layout diagram of the relative positions of the two leaf springs according to the present invention. The labels in the figures illustrate: the device comprises an upper fixing arm (1), an upper pull rod seat (2), an upper push rod seat (3), a first spring (4), an upper push rod (5), a line pressing cover (6), a first leaf spring (7), a second leaf spring (8), a lower push rod (9), a second spring (10), a lower push rod seat (11), a lower pull rod seat (12), a gauge length block (13), a gauge length block seat (14), a lower fixing arm (15), a lower cutter opening (16), a middle fixing arm (17), a limiting rope (18), a bar material sample (19), a lower pull rod (20), an upper pull rod (21), an upper cutter opening (22), a positioning pin seat (23), a positioning pin (24), a replacement pull rod (25) and a plate material sample (26).

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1, 2 and 3, fig. 1 is a schematic structural view of a strain extensometer according to the present invention, and fig. 2 is a top view of a bar sample clamped in fig. 1. Fig. 3 is the plan view of this extensometer centre gripping panel sample, the utility model provides a strain type extensometer, its complex scheduling problem of dismouting when mainly being used for solving the centre gripping that current formula of pressing from both sides extensometer exists inconvenient, the scale distance is unchangeable or becomes the scale distance.

The utility model relates to a strain extensometer, which comprises an upper fixed arm (1), a lower fixed arm (15) and a middle fixed arm (17), wherein the rear end of the upper fixed arm (1) is connected with the rear end of the middle fixed arm (17) through a first leaf spring (7) and a second leaf spring (8); a gauge length block (13) is arranged between the upper fixing arm (1) and the lower fixing arm (15), the gauge length block (13) is directly connected with the lower fixing arm (15) through a screw and is connected with the middle fixing arm (17) through a gauge length block seat (14), an upper pull rod seat (2) and an upper push rod seat (3) are arranged on the upper fixing arm (1), a lower pull rod seat (12) and a lower push rod seat (11) are arranged on the lower fixing arm (15), an upper pull rod (21) is installed in the upper pull rod seat (2), and a lower pull rod (20) is installed in the lower pull rod seat (12); an upper push rod (5) is arranged in the upper push rod seat (3), a first spring (4) is sleeved on the upper push rod (5), one end of the upper push rod (5) is connected with the upper pull rod seat (2), a lower push rod (9) is arranged in the lower push rod seat (11), a second spring (10) is sleeved on the lower push rod (9), and one end of the lower push rod (9) is connected with the upper pull rod seat (15); the front ends of the upper fixing arm (1) and the lower fixing arm (15) are respectively provided with an upper knife edge (22) and a lower knife edge (16); a positioning pin seat (23) is arranged between the front end of the upper fixing arm (1) and the front end of the middle fixing arm (17), and the front end of the middle fixing arm (17) is connected with the positioning pin seat (23) through a screw; the front end of the upper fixing arm (1) is connected with a positioning pin seat (23) through a positioning pin (24).

As shown in fig. 2, the gauge block (13) can be replaced by gauge blocks of different sizes, thereby realizing the variable gauge. The knife edge and the pull rod can form a three-point contact plane, the plane formed by the three points is accurate, reliable and not easy to slide, and the device can be suitable for testing samples with different diameters, and can be adjusted or replaced according to different samples, so that the measuring range of the extensometer is wider.

As shown in fig. 3, in addition, measurement of the sheet material specimen (26) can be achieved by replacing the replacement tie bar (25) with a different type.

The upper pull rod (21) is connected with the upper push rod (5) through an upper pull rod seat (2), the upper push rod (5) penetrates through the upper push rod seat (3), and a first spring (4) is arranged between the upper push rod (5) and the upper push rod seat (3) to clamp the upper end of a sample (23); similarly, the lower pull rod (20) is connected with the lower push rod (12) through a lower pull rod seat (12), the lower push rod (12) penetrates through the lower push rod seat (11), and a second spring (13) is arranged between the lower push rod (12) and the lower push rod seat (11) to clamp the lower end of the sample (23); therefore, the sample can be released and clamped by simultaneously pushing or releasing the upper and lower push rods (5) and (12), and the operation is convenient.

Because a positioning pin seat (23) is arranged between the front end of the upper fixing arm (1) and the front end of the middle fixing arm (17), the front end of the middle fixing arm (17) is connected with the positioning pin seat (23) through a screw, and the front end of the upper fixing arm (1) is connected with the positioning pin seat (23) through a positioning pin (24); before the deformation of the test sample is detected, the positioning pin (24) is inserted, the extensometer is on the fixed gauge length, and after the test is finished, the positioning pin (24) is pulled out, so that the upper fixing arm (1) and the middle fixing arm (17) can freely move to realize the synchronous deformation with the tested sample, and the deformation measurement of the test sample is realized. A limiting rope (18) is arranged between the upper fixing arm (1) and the middle fixing arm (17) to prevent the instrument from being damaged due to the fact that the upper fixing arm (1) and the middle fixing arm (17) are excessively opened when a locating pin is not inserted;

as shown in fig. 4, in the present invention, one end of the first leaf spring (7) is connected to the upper fixing arm (1), the other end is connected to the gauge block seat (14), and the gauge block seat (14) is tightly connected to the middle fixing arm (17), so that the upper fixing arm (1) and the middle fixing arm (17) are connected through the first leaf spring (7); one end of the second leaf spring (8) is connected with the middle fixed arm (17), the other end of the second leaf spring is connected with the upper push rod seat (3), the upper push rod seat (3) is tightly connected with the upper fixed arm (1), and thus the upper fixed arm (1) is connected with the middle fixed arm (17) through the second leaf spring (8); first leaf spring (7) are the cross with second leaf spring (8) and arrange, are provided with the foil gage on second leaf spring (8) to constitute full bridge measuring circuit with the foil gage that sets up, arrange the space size that has greatly reduced the extensometer like this, make the utility model has the characteristics of compact structure, the quality is light.

The utility model discloses when testing the sample, with the sample centre gripping between the edge of a knife and pull rod, when the sample is tensile or compression, the edge of a knife is followed the sample and is warp, the edge of a knife is connected with the fixed arm front end, the deformation of sample can be through the transmission that the fixed arm corresponds on being equipped with the foil gage and forming full-bridge circuit's leaf spring, take place to warp when the leaf spring, the resistance value of foil gage will change, thereby make the bridge circuit unbalance, output voltage signal, amplify this signal, the computer processing, the conversion can show the measuring deflection in the computer.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A strain extensometer comprises an upper fixed arm (1), a lower fixed arm (15) and a middle fixed arm (17), and is characterized in that the rear end of the upper fixed arm (1) is connected with the rear end of the middle fixed arm (17) through a first leaf spring (7) and a second leaf spring (8); a gauge length block (13) is arranged between the upper fixing arm (1) and the lower fixing arm (15), the gauge length block (13) is directly connected with the lower fixing arm (15) through a screw and is connected with the middle fixing arm (17) through a gauge length block seat (14), an upper pull rod seat (2) and an upper push rod seat (3) are arranged on the upper fixing arm (1), a lower pull rod seat (12) and a lower push rod seat (11) are arranged on the lower fixing arm (15), an upper pull rod (21) is installed in the upper pull rod seat (2), and a lower pull rod (20) is installed in the lower pull rod seat (12); an upper push rod (5) is arranged in the upper push rod seat (3), a first spring (4) is sleeved on the upper push rod (5), one end of the upper push rod (5) is connected with the upper pull rod seat (2), a lower push rod (9) is arranged in the lower push rod seat (11), a second spring (10) is sleeved on the lower push rod (9), and one end of the lower push rod (9) is connected with a lower pull rod seat (12); the front ends of the upper fixing arm (1) and the lower fixing arm (15) are respectively provided with an upper knife edge (22) and a lower knife edge (16); a positioning pin seat (23) is arranged between the front end of the upper fixing arm (1) and the front end of the middle fixing arm (17), and the front end of the middle fixing arm (17) is connected with the positioning pin seat (23) through a screw; the front end of the upper fixing arm (1) is connected with a positioning pin seat (23) through a positioning pin (24).

2. A strain gage as defined in claim 1, wherein a stopper rope (18) is provided between the upper fixed arm (1) and the intermediate fixed arm (17).

3. A strain gauge according to claim 1, wherein the upper (21) and lower (20) tie rods holding the bar sample (19) are replaced by replacement tie rods (25) holding the sheet sample (26) to allow measurement of the deformation of the sheet sample (26).

4. A strain extensometer as claimed in claim 1, characterized in that the upper fixed arm (1) is connected to a first leaf spring (7) at one end and to a gauge block holder (14) at the other end, the gauge block holder (14) being tightly connected to an intermediate fixed arm (17), the upper fixed arm (1) and the intermediate fixed arm (17) being connected by means of the first leaf spring (7); second leaf spring (8) one end is connected with middle fixed arm (17), and the other end is connected with last push rod seat (3), go up push rod seat (3) and last fixed arm (1) zonulae occludens, go up fixed arm (1) and middle fixed arm (17) and be connected through second leaf spring (8).

5. A strain extensometer as claimed in claim 4, characterized in that the first leaf spring (7) and the second leaf spring (8) are arranged crosswise and a strain gage is arranged on the second leaf spring (8), which greatly reduces the spatial dimensions of the extensometer while enabling the measurement of the deformation of the test specimen.

6. A strain extensometer as claimed in claim 1, characterized in that the gauge length block (13) can be replaced by gauge length blocks of different sizes, so that the gauge length can be changed, and the gauge length can be changed by only disassembling and assembling the gauge length block, which is easy to disassemble and assemble.

7. A strain gauge as claimed in claim 1, wherein the upper and lower jaws (22, 16) are replaceable.