CN217738168U

CN217738168U - Composite range strain sensor

Info

Publication number: CN217738168U
Application number: CN202221302405.7U
Authority: CN
Inventors: 付焕然; 傅东有
Original assignee: Zhengzhou Haifu Electromechanical Equipment Co ltd
Current assignee: Zhengzhou Haifu Electromechanical Equipment Co ltd
Priority date: 2022-05-28
Filing date: 2022-05-28
Publication date: 2022-11-04
Anticipated expiration: 2032-05-28

Abstract

The utility model discloses a composite range strain sensor, which comprises an elastic deformation part and a strain sensitive part; the elastic deformation part comprises a plurality of stages of elastic elements which are used for bearing the measured force and can deform, the elastic element of the previous stage is stressed and deformed firstly, when the measured force exceeds a set measurement value corresponding to the elastic element of the previous stage, the elastic element of the previous stage transmits the force to the elastic element of the next stage, and the elastic element of the next stage and the elastic elements of all stages above the elastic element of the next stage are stressed and deformed together; the strain sensitive part comprises an elastic element attached to the surface of a first-level elastic element and used for detecting the deformation amount of the first-level elastic element and converting the deformation amount of the first-level elastic element into a strain gauge for outputting resistance value data.

Description

Composite range strain sensor

Technical Field

The utility model relates to a strain sensor equipment technical field specifically is a compound range strain sensor.

Background

The strain sensor mainly utilizes the principle that the internal resistance value changes after the strain sensitive element deforms to convert the stressed deformation into the electric signal for output, and has the advantages of simple structure, high sensitivity and the like, so that the strain sensor is widely used.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome current defect, provide a compound range strain transducer, adopt multistage elastic element to make up the mode of atress in proper order, effectively adjust in different atress intervals, determine the relation proportion of power value variation and elastic element deformation volume to obtain the measuring range more extensively, can effectively solve the problem in the background art.

In order to achieve the above object, the utility model provides a following technical scheme: a composite range strain sensor comprises an elastic deformation part and a strain sensitive part;

the elastic deformation part comprises a plurality of stages of elastic elements which are used for bearing the measured force and can deform, the elastic element of the previous stage is stressed and deformed firstly, when the measured force exceeds a set measurement value corresponding to the elastic element of the previous stage, the elastic element of the previous stage transmits the force to the elastic element of the next stage, and the elastic element of the next stage and the elastic elements of all stages above the elastic element of the next stage are stressed and deformed together;

and the strain sensitive part comprises a strain gauge attached to the surface of the first-stage elastic element and used for detecting the deformation of the first-stage elastic element and converting the deformation into resistance value data to be output.

As a preferred technical scheme of the utility model, foil gage symmetrical arrangement is on first order elastic element's surface, and elastic element's same surface arranges two sets of foil gages along length direction.

As a preferred technical scheme of the utility model, the elastic deformation part comprises a base and a plurality of groups of deformation columns which are vertical to the base and can be deformed; and a stress platform is arranged at the top of the deformation column, and a gap is reserved between the stress platform of the next-stage elastic element and the stress platform of the previous-stage elastic element.

As a preferred technical scheme of the utility model, first order elastic element is the I-shaped, and first order elastic element's deformation post both sides all are provided with inferior one-level or multistage deformation post.

As a preferred technical scheme of the utility model, except the same subbase of the deformation post sharing of first order elastic element's deformation post all the other, subbase sets up with first order elastic element's base relatively fixed.

As a preferred technical scheme of the utility model, elastic deformation portion includes the elastic element that a plurality of groups arranged with the cantilever beam form, and all elastic element are in the relative fixed connection of one end of same side, and elastic element's free end is provided with the contact post that can contradict next-level elastic element free end, leave the gap between contact post and the next-level elastic element.

Compared with the prior art, the beneficial effects of the utility model are that: this compound range strain sensor adopts a plurality of grades of elastic element to make up, and adopts the mode of combination atress in grades, and the measuring force is big more promptly, and the elastic component group that is used for the atress deformation is more, has little power measurement sensitivity height concurrently, the wide advantage of the range of energetically measuring.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment;

FIG. 2 is a schematic structural diagram of the second embodiment;

FIG. 3 is an exploded view of the parts of the second embodiment;

FIG. 4 is a front view of the second embodiment;

FIG. 5 isbase:Sub>A cross-sectional view taken along line A-A;

FIG. 6 is a schematic structural view of the third embodiment;

FIG. 7 is a sectional view of the third embodiment.

The arrows in the figure are the directions of the measuring forces.

In the figure: 1. a central elastic element; 101. a primary deformation column; 102. a first level stress platform; 103. a primary base; 2. a peripheral elastic element; 201. a secondary deformation column; 202. a secondary force-bearing platform; 203. a secondary base; 3. a screw; 4. a strain gauge; 5. a cantilever beam elastic element; 501. a primary cantilever beam; 5011. a contact post; 502. a secondary cantilever beam; 503. and (7) mounting holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the 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 all belong to the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1, the present invention provides a technical solution: the utility model provides a compound range strain transducer, includes I-shaped central elastic element 1, and middle vertical portion is one-level deformation post 101, and the top of one-level deformation post 101 is one-level stress platform 102, and the both sides of one-level deformation post 101 all set up secondary deformation post 201, and the top of secondary deformation post 201 sets up secondary stress platform 202, leaves the gap between one-level stress platform 102 and the secondary stress platform 202, and foil gage 4 is attached in the both sides of one-level deformation post 101.

When the first-stage stress platform 102 on the top is stressed, the first-stage deformation column 101 is deformed first, the strain gauge 4 converts the deformation quantity of the first-stage deformation column 101 into an electric signal to be output, and the ratio of the deformation quantity of the first-stage deformation column to the force increment is large at the moment, so that the measurement sensitivity is high;

when the measuring force is continuously increased, the primary stress platform 102 is in contact with the secondary stress platform 202 to carry out force transmission, the secondary deformation column 201 and the primary deformation column 101 are simultaneously stressed, and the ratio of the variable of the primary deformation column to the force increasing amount is reduced, so that the measuring range of the measuring force is increased;

when the measuring force is continuously increased, the first-stage deformation column is stressed at the same time, and the ratio of the variable of the first-stage deformation column to the force increasing amount is continuously reduced, so that the measuring range of the measuring force is continuously increased.

The second embodiment:

referring to fig. 2 to 5, the present embodiment has a structure substantially the same as that of the embodiment, except that the present embodiment includes a central elastic element 1 and a peripheral elastic element 2 which are separated from each other, the central elastic element 1 is i-shaped, the peripheral elastic element is C-shaped, all the deformation columns except the primary deformation column 101 are included in the peripheral elastic element 2, the stress platforms in the peripheral elastic element 2 correspond to the deformation columns one to one, and the base is a common secondary base 203; the surface of the primary base 103 of the central elastic element 1 is provided with a mounting groove for mounting the secondary base 203, and the secondary base 203 and the primary base 103 are fixed by a screw 3.

The design that the central elastic element 1 and the peripheral elastic element 2 can be separated is adopted, so that the strain gauge 4 can be conveniently stuck on the surface of the primary deformation column 101.

Example three:

referring to fig. 6-7, the present embodiment includes a cantilever elastic element 5, which includes a plurality of groups of cantilever-form elastic elements, wherein the ratio of the deformation variation of the next-level elastic element to the stress variation is greater than the previous level, that is, the stiffness of the next-level elastic element is higher than the previous level, a strain gauge 4 is attached to both sides of the first-level cantilever 501, and the upper portion of the free end of the first-level cantilever 501 is a stress surface, when the stress is applied to the free end, the first-level cantilever 501 bends and deforms downward first, the strain gauge 4 converts the deformation into an electrical signal with a resistance change, and the electrical signal is output, and at this time, the ratio of the deformation of the first-level cantilever 501 to the force increase is larger, so that the measurement sensitivity is higher;

when the measuring force is continuously increased, the contact column 5011 at the end part of the primary cantilever beam 501 is contacted with the upper part of the free end of the secondary cantilever beam 502 to carry out force transmission, the secondary cantilever beam 502 and the primary cantilever beam 501 are simultaneously stressed and deformed, and the ratio of the deformation amount of the primary cantilever beam 501 to the force increasing amount is reduced at the moment, so that the measuring range of the measuring force is increased;

when the measuring force is continuously increased, the cantilever beam at the first level is stressed at the same time, and the ratio of the deformation quantity of the cantilever beam 501 at the first level to the force increasing quantity is continuously reduced at the moment, so that the measuring range of the measuring force is continuously increased.

And the side part of the cantilever beam elastic element 5 is provided with a mounting hole 503 for integral fixed mounting.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a compound range strain transducer, includes elastic deformation portion and strain sensitive portion, its characterized in that:

and the strain sensitive part comprises a strain gauge (4) which is attached to the surface of the first-stage elastic element and is used for detecting the deformation of the first-stage elastic element and converting the deformation into resistance value data to be output.

2. The composite span strain sensor of claim 1, wherein: the strain gauges (4) are symmetrically arranged on the surface of the first-stage elastic element, and two groups of strain gauges (4) are arranged on the same surface of the elastic element along the length direction.

3. The composite span strain sensor of claim 1 or 2, wherein: the elastic deformation part comprises a base and a plurality of groups of deformation columns which are vertical to the base and can deform; and a stress platform is arranged at the top of the deformation column, and a gap is reserved between the stress platform of the next-stage elastic element and the stress platform of the previous-stage elastic element.

4. The composite span strain sensor of claim 3, wherein: the first-stage elastic element is I-shaped, and the two sides of the deformation column of the first-stage elastic element are both provided with secondary one-stage or multi-stage deformation columns.

5. The composite span strain sensor of claim 4, wherein: the other deformation columns except the deformation column of the first-stage elastic element share the same secondary base, and the secondary base and the base of the first-stage elastic element are relatively fixedly arranged.

6. The composite span strain sensor of claim 1, wherein: the elastic deformation portion comprises a plurality of groups of elastic elements which are arranged in a cantilever beam mode, one ends of all the elastic elements which are located on the same side are fixedly connected relatively, the free ends of the elastic elements are provided with contact columns (5011) capable of abutting against the free ends of the next-stage elastic elements, and gaps are reserved between the contact columns (5011) and the next-stage elastic elements.