CN220454506U - Strain sensing assembly and strain detector - Google Patents

Abstract

The application provides a strain sensing assembly and a strain detector, wherein the strain detector comprises a strain sensing assembly, the strain sensing assembly comprises an elastic piece, a pair of fixing pieces and a plurality of strain sensitive elements, the elastic piece can deform in a telescopic manner along a first direction, and the pair of fixing pieces are respectively arranged at two ends of the elastic piece along the first direction; the elastic piece comprises a plurality of first connecting pieces and a plurality of second connecting pieces, each first connecting piece is connected with part or all of the second connecting pieces in a crossing mode to form a plurality of nodes, the nodes are provided with strain sensitive elements, and the strain sensitive elements are used for detecting strain force of the connected nodes and converting the strain force into electric signals to be output. Through setting up elastic component and a pair of mounting and cooperateing, can conveniently transmit the deformation of article to the elastic component, the deformation of the node that the deformation of first connecting piece or second connecting piece can arouse to connect, and the deformation that the node produced is less, is applicable to the strain of detection article under the condition of big elongation, and the commonality is higher.

Description

Strain sensing assembly and strain detector

Technical Field

The application belongs to the technical field of detection equipment, and more particularly relates to a strain sensing assembly and a strain detector.

Background

The strain detector is used for acquiring strain data of an object, is provided with a strain sensing component, and can convert deformation of the object into change of electrical parameter data such as resistance, capacitance or inductance through the strain sensing component by connecting the strain sensing component with the object to be detected, so that the strain data of the object can be conveniently detected, and the strain detector is widely applied to the fields such as electronics, industry, agriculture and medical treatment at present.

The common strain sensing component is provided with a strain sensitive element, when the strain sensing component is used, the strain sensitive element is directly connected with an object to be detected, deformation of the object causes deformation of the strain sensitive element and is converted into an electric signal to be output so as to obtain strain data of the object to be detected, and the strain sensitive element is generally made of materials with limited deformation ranges such as elastic alloy, quartz, ceramic, semiconductor silicon and the like, so that the strain of the object under the condition of large elongation is difficult to detect, and the sensor has poor universality.

Disclosure of Invention

An objective of the embodiments of the present application is to provide a strain sensing assembly and a strain gauge, so as to solve the technical problems of poor versatility and poor strain of an object difficult to be detected by the strain sensing assembly under the condition of large elongation due to the fact that a strain sensing element is directly connected with the object to be detected in the prior art.

In order to solve the above-mentioned technical problems, in a first aspect, an embodiment of the present application provides a strain sensing assembly, where the strain sensing assembly includes an elastic member, a pair of fixing members and a plurality of strain sensitive elements, the elastic member can be deformed in a telescopic manner along a first direction, and the pair of fixing members are respectively installed at two ends of the elastic member along the first direction, and the fixing members are used for connecting an object to be detected; the elastic piece comprises a plurality of first connecting pieces and a plurality of second connecting pieces, each first connecting piece and part or all of the second connecting pieces are connected in a crossing mode to form a plurality of nodes, the nodes are used for installing strain sensitive elements, and the strain sensitive elements are used for detecting the strain force of the connected nodes and converting the strain force into electric signals to be output.

The beneficial effect that this application provided strain sensing subassembly lies in: the elastic piece is matched with the pair of fixing pieces, and the fixing pieces are simultaneously connected with the elastic piece and the object to be detected, so that deformation of the object can be conveniently transmitted to the elastic piece, and the elastic piece can be elastically deformed along the first direction; the whole deformation of the elastic piece can be transmitted to each first connecting piece and each second connecting piece in a dispersing way, the deformation of the first connecting piece or the deformation of the second connecting piece can cause the deformation of a connected node, the deformation of the node is converted into an electric signal through a strain sensitive element to be output, and the whole deformation of the elastic piece can be obtained by fitting the deformation of each node, so that the strain of an object can be accurately detected; compared with the prior art, the strain sensitive element is directly connected with an object to be detected, the strain sensitive element is connected with the node, the first connecting piece and the second connecting piece are larger in size and can bear more deformation, and when the larger deformation generated by the first connecting piece and the second connecting piece is transferred to the connected node, the deformation generated by the node is smaller, the strain sensitive element can be guaranteed to deform in a working range, and therefore the strain sensitive element is suitable for detecting the strain of the object under the condition of large elongation, and the universality is higher.

In one technical scheme, a plurality of first connecting pieces are arranged in parallel at equal intervals, a plurality of second connecting pieces are arranged in parallel at equal intervals, and the interval between two adjacent first connecting pieces is equal to the interval between two adjacent second connecting pieces.

By the design, the deformation of each part of the elastic piece is more uniform, the deformation of the nodes is more linear, and the integral deformation of the elastic piece is conveniently fitted by the deformation of each node.

In one possible technical solution, the length direction of the fixing member is perpendicular to the first direction, and the length direction of the first connecting member and the length direction of the second connecting member are both inclined to the first direction.

Through the design, the whole deformation of the elastic piece is concentrated on the expansion deformation along the first direction, so that the interference caused by the deformation of other directions on the deformation of the first direction is reduced, and the output result of the strain sensing assembly is more accurate.

In one possible technical solution, a part of the plurality of nodes is disposed in the middle of the elastic member and corresponds to the plurality of strain sensitive elements one by one, and another part of the plurality of nodes is disposed around the periphery of the elastic member.

In one possible solution, a plurality of the nodes located in the same first connection piece or the same second connection piece are arranged at equal intervals.

In one possible technical solution, the node located at the side edge of the elastic element along the first direction is connected to a middle part of the fixing element, one of the plurality of first connecting elements is connected to one end of the same fixing element, and one of the plurality of second connecting elements is connected to the other end of the same fixing element.

In one technical scheme, the elastic piece further comprises a plurality of cavities, the cavities are arranged at intervals in the middle of the elastic piece, and the cavities are formed by encircling an adjacent pair of first connecting pieces and an adjacent pair of second connecting pieces.

In one implementation technical scheme, the elastic piece further comprises a plurality of notches, the notches are arranged around the periphery of the elastic piece, and the notches are formed by extending the first connecting piece and the second connecting piece which are connected to the same node in a direction away from the node.

In one implementation, the strain sensitive element includes a plurality of resistors, where a plurality of the resistors are electrically connected as a wheatstone bridge, and at least one of the plurality of resistors is a strain sensitive resistor.

In a second aspect, embodiments of the present application further provide a strain gauge including the strain sensing assembly described above.

The beneficial effect that this application provided strain gauge lies in: by arranging the strain sensing assembly, the strain of the object under the condition of large elongation can be detected, and the universality is better.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a strain sensing assembly according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural view of an elastic member according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a strain sensitive element according to an embodiment of the present application.

Wherein, each reference sign in the figure:

10. an elastic member; 11. a first connector; 12. a second connector; 13. a node; 14. a cavity; 15. a notch;

20. a fixing member;

30. strain sensitive elements.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The following detailed description is made with reference to specific drawings and examples:

referring to fig. 1 and 2 together, the embodiment of the present application provides a strain sensing assembly, which includes an elastic member 10, a pair of fixing members 20 and a plurality of strain sensitive elements 30, wherein the elastic member 10 can be elastically deformed along a first direction, the pair of fixing members 20 are respectively mounted at two ends of the elastic member 10 along the first direction, and the fixing members 20 are used for connecting an object to be detected; the elastic member 10 includes a plurality of first connecting members 11 and a plurality of second connecting members 12, each first connecting member 11 is cross-connected with a part or all of the second connecting members 12 to form a plurality of nodes 13, the nodes 13 are provided for mounting a strain sensitive element 30, and the strain sensitive element 30 is used for detecting the strain force of the connected nodes 13 and converting the strain force into an electrical signal for output.

By arranging the elastic piece 10 to be matched with the pair of fixing pieces 20, the fixing pieces 20 are simultaneously connected with the elastic piece 10 and the object to be detected, so that deformation of the object can be conveniently transmitted to the elastic piece 10, and the elastic piece 10 can be elastically deformed along the first direction; the integral deformation of the elastic member 10 can be transmitted to each first connecting member 11 and each second connecting member 12 in a dispersing way, the deformation of the first connecting member 11 or the deformation of the second connecting member 12 can cause the deformation of the connected node 13, the deformation of the node 13 is converted into an electric signal output through the strain sensitive element 30, and the integral deformation of the elastic member 10 can be obtained by fitting the deformation of each node 13, so that the strain of an object can be accurately detected; the strain sensitive element 30 is connected with the node 13, the first connecting piece 11 and the second connecting piece 12 have larger volume and can bear more deformation compared with the node 13, and when the larger deformation generated by the first connecting piece 11 and the second connecting piece 12 is transmitted to the connected node 13, the deformation generated by the node 13 is smaller, and the strain sensitive element 30 can be ensured to deform in a working range, so that the strain sensitive element is suitable for detecting the strain of an object under the condition of large elongation and has higher universality.

In application, the elastic member 10 may be made of one or more materials selected from fiber, metal, polyimide, polyethylene terephthalate and polycarbonate, and the fixing member 20 may be made of one or more materials selected from plastic, metal or inorganic nonmetal.

In application, the first direction is parallel to the length direction of the elastic member 10, when the elastic member 10 is stretched in the first direction, the length of the elastic member 10 is expanded, the width of the elastic member 10 is reduced, and when the elastic member 10 is contracted in the first direction, the length of the elastic member 10 is reduced, and the width of the elastic member 10 is expanded.

In application, the side of the fixing member 20 facing the elastic member 10 and the side of the fixing member 20 facing the object to be detected are respectively bonded by using a glue, wherein the glue can be one of acrylic glue, epoxy glue, acrylic glue and shadowless glue.

In application, the first connecting piece 11 and the second connecting piece 12 are both in a linear structure, the whole elastic piece 10 is in a rectangular net structure, and it is understood that in other embodiments of the present application, the whole elastic piece 10 can also be in a polygonal net structure or an arc net structure, so that strain detection of objects with various working conditions or various shapes can be realized.

In application, the strain sensitive element 30 is printed on the node 13 by using an integrated circuit process, and it is understood that in other embodiments of the present application, the strain sensitive element 30 may be bonded to the node 13 by using a glue, and materials used for the glue are consistent with those described above, and will not be described herein.

In one embodiment, referring to fig. 1 and 2 together, the plurality of first connectors 11 are arranged in parallel at equal intervals, the plurality of second connectors 12 are arranged in parallel at equal intervals, and the interval between two adjacent first connectors 11 is equal to the interval between two adjacent second connectors 12.

In application, the deformation of each part of the elastic member 10 can be more uniform by adopting the design, and the deformation of each node 13 is more linear, so that the integral deformation of the elastic member 10 can be conveniently fitted by the deformation of each node 13.

In one embodiment, referring to fig. 1 and 2 together, the length direction of the fixing member 20 is perpendicular to the first direction, and the length directions of the first connecting member 11 and the second connecting member 12 are both inclined to the first direction.

In application, the whole of the first connecting pieces 11 and the whole of the second connecting pieces 12 are symmetrically arranged along the central axis of the first direction relative to the whole of the elastic piece 10, so that the whole deformation of the elastic piece 10 is concentrated on the expansion deformation along the first direction, the interference caused by the deformation in other directions on the deformation in the first direction is reduced, and the output result of the strain sensing assembly is more accurate.

In one embodiment, referring to fig. 1 and 2 together, a portion of the plurality of nodes 13 is disposed in the middle of the elastic member 10 and corresponds to the plurality of strain sensitive elements 30 one by one, and another portion of the plurality of nodes 13 is disposed around the periphery of the elastic member 10.

In application, since the deformation of the periphery of the elastic member 10 is larger than the deformation of the middle of the elastic member 10, the strain sensitive element 30 is disposed at the node 13 of the elastic member 10 at the middle, and the deformation of the strain sensitive element 30 is reduced relative to the strain sensitive element 30 disposed at the node 13 of the periphery of the elastic member 10, so that the strain sensing assembly is suitable for detecting the strain of an object under a larger elongation, and the versatility is further improved.

In one embodiment, referring to fig. 1 and 2, the nodes 13 of the same first connector 11 or the same second connector 12 are equally spaced.

In application, the plurality of nodes 13 respectively connected with the strain sensitive elements 30 are arranged in a central symmetry manner relative to the center of the elastic piece 10, so that the deformation uniformity of the elastic piece 10 can be further improved, and the detection result is more accurate.

In one embodiment, referring to fig. 1 and 2 together, the node 13 located at the side edge of the elastic member 10 along the first direction is connected to the middle of a fixing member 20, one of the plurality of first connecting members 11 is connected to one end of the same fixing member 20, and one of the plurality of second connecting members 12 is connected to the other end of the same fixing member 20.

In application, each part of the fixing element 20 along the length direction is respectively connected with the node 13, the end part of the first connecting element 11 and the end part of the second connecting element 12, so that the connection between the fixing element 20 and the elastic element 10 is firmer.

In an embodiment, referring to fig. 1 and 2 together, the elastic member 10 further includes a plurality of cavities 14, the plurality of cavities 14 are disposed at intervals in the middle of the elastic member 10, and the cavities 14 are surrounded by an adjacent pair of first connecting members 11 and an adjacent pair of second connecting members 12.

In application, the cavity 14 is used for deforming the middle part of the elastic element 10, and the connecting part between the connecting piece 11 of the inner Zhou Zaidi of the cavity 14 and the second connecting piece 12 is provided with a round corner, so that the stress concentration at the connecting part can be reduced, the elastic element 10 can still maintain the elastic restoring capability after being deformed for a plurality of times, and the service durability of the elastic element 10 is improved.

In one embodiment, referring to fig. 1 and 2 together, the elastic member 10 further includes a plurality of notches 15, wherein the notches 15 are disposed around the periphery of the elastic member 10, and the notches 15 are formed by extending the first connecting member 11 and the second connecting member 12 connected to the same node 13 in a direction away from the node 13.

In use, the recess 15 allows the peripheral edge of the elastic member 10 to deform, so as to conveniently transfer the deformation of the elastic member 10 from the peripheral edge to the middle.

In one embodiment, referring to fig. 1-3, the strain sensitive element 30 includes a plurality of resistors electrically connected as a wheatstone bridge, at least one of the plurality of resistors being a strain sensitive resistor.

In application, the number of the resistors is four, one of the four resistors is a strain sensitive resistor, when the strain sensitive resistor is deformed under the action of external force, the resistance value of the strain sensitive resistor correspondingly changes, when an object to be detected is deformed, the pair of fixing pieces 20 relatively move along the first direction so as to drive the whole elastic piece 10 to deform, the deformation is transmitted to each node 13 through the plurality of first connecting pieces 11 and the plurality of second connecting pieces 12, the connected strain sensitive resistor is deformed through the deformation of the node 13, and the resistance value of the strain sensitive element 30 changes, so that the deformation of the node 13 is converted into electric signal output.

Referring to fig. 1, the present application further provides a strain gauge including the strain sensing assembly described above.

In application, the strain detector can detect the strain of an object under the condition of large elongation by arranging the strain sensing assembly, and has better universality.

The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.

Claims (10)

1. The strain sensing assembly is characterized by comprising an elastic piece (10), a pair of fixing pieces (20) and a plurality of strain sensitive elements (30), wherein the elastic piece (10) can be deformed in a telescopic manner along a first direction, the pair of fixing pieces (20) are respectively arranged at two ends of the elastic piece (10) along the first direction, and the fixing pieces (20) are used for connecting an object to be detected; the elastic piece (10) comprises a plurality of first connecting pieces (11) and a plurality of second connecting pieces (12), each first connecting piece (11) is connected with part or all of the second connecting pieces (12) in a crossing mode to form a plurality of nodes (13), the nodes (13) are used for being installed by the strain sensitive elements (30), and the strain sensitive elements (30) are used for detecting the strain force of the connected nodes (13) and converting the strain force into electric signals to be output.

2. Strain sensing assembly according to claim 1, wherein a plurality of the first connectors (11) are arranged in equally spaced parallel arrangement and a plurality of the second connectors (12) are arranged in equally spaced parallel arrangement, the spacing between adjacent two of the first connectors (11) being equal to the spacing between adjacent two of the second connectors (12).

3. The strain sensing assembly of claim 2, wherein the length direction of the securing member (20) is perpendicular to the first direction, and the length direction of the first connecting member (11) and the length direction of the second connecting member (12) are both oblique to the first direction.

4. The strain sensing assembly of claim 2, wherein a portion of the plurality of nodes (13) is disposed in a middle portion of the elastic member (10) and corresponds to the plurality of strain sensitive elements (30) one by one, and another portion of the plurality of nodes (13) is disposed around a periphery of the elastic member (10).

5. Strain sensing assembly according to claim 4, wherein a plurality of the nodes (13) located in the same first connection (11) or the same second connection (12) are equally spaced.

6. A strain sensing assembly according to claim 4, wherein the node (13) located at the side edge of the elastic member (10) in the first direction is connected to a middle portion of one of the fixing members (20), one of the plurality of first connection members (11) is connected to one end of the same fixing member (20), and one of the plurality of second connection members (12) is connected to the other end of the same fixing member (20).

7. The strain sensing assembly of any of claims 1 to 6, wherein the elastic member (10) further comprises a plurality of cavities (14), wherein a plurality of the cavities (14) are disposed at intervals in the middle of the elastic member (10), and the cavities (14) are surrounded by an adjacent pair of the first connecting members (11) and an adjacent pair of the second connecting members (12).

8. A strain sensing assembly according to any of claims 1 to 6, wherein the resilient member (10) further comprises a plurality of recesses (15), a plurality of the recesses (15) being arranged around the periphery of the resilient member (10), the recesses (15) being formed by the first and second connection members (11, 12) being connected to the same node (13) extending away from the node (13), respectively.

9. A strain sensing assembly according to any of claims 1 to 6, wherein the strain sensitive element (30) comprises a plurality of resistors, a plurality of said resistors being electrically connected as a wheatstone bridge, at least one of the plurality of resistors being a strain sensitive resistor.

10. A strain gauge comprising a strain sensing assembly according to any one of claims 1 to 9.