CN115200466B

CN115200466B - Spliced integrated flexible strain gauge and monitoring method

Info

Publication number: CN115200466B
Application number: CN202210992142.5A
Authority: CN
Inventors: 薛东杰; 贾震; 程建超; 潘阮航; 崔传健; 曾令豪; 潘际臣; 海那尔·吐尔逊哈力; 王路军; 任伟光
Original assignee: China University of Mining and Technology Beijing CUMTB
Current assignee: China University of Mining and Technology Beijing CUMTB
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2025-10-31
Anticipated expiration: 2042-08-17
Also published as: CN115200466A

Abstract

This invention discloses a modular integrated flexible strain gauge and its monitoring method, belonging to the field of strain measurement devices, to solve the problems of small deformation capacity and small coverage area of traditional resistive strain gauges. The strain gauge includes a substrate, a sensing part located on the upper surface of the substrate, and a conducting part. The substrate is approximately rectangular, but actually octagonal, designed to prevent wear on the edges while allowing the modular integrated flexible strain gauges to bend and deform arbitrarily. After monitoring by a specially designed circuit driving system and a specially designed microcontroller, the overall data is imported into a computer to generate contour maps for analysis. This invention provides a modular integrated flexible strain gauge and its monitoring method composed of multiple specially designed strain gauges assembled together. It solves the problem of inaccurate measurement of strain when measuring irregular objects, large objects, and multi-instrument integrated objects.

Description

Spliced integrated flexible strain gauge and monitoring method

Technical Field

The invention belongs to the field of strain measurement devices. In particular to a conductive flexible strain gauge.

Background

The strain gauge is an element for measuring strain, which is constituted by a sensitive grating or the like. The strain gage at present is divided into two types, namely a resistance strain gage and an optical strain gage. The working principle of the resistance strain gauge is based on the strain effect, namely, when a conductor or a semiconductor material is mechanically deformed under the action of external force, the resistance value of the resistance strain gauge correspondingly changes, and the phenomenon is called as the strain effect. The semiconductor strain gauge is made of semiconductor materials, and the working principle of the semiconductor strain gauge is based on the piezoresistive effect of the semiconductor materials. The piezoresistive effect is a phenomenon that when a certain axial direction of a semiconductor material is subjected to an external force, its resistivity changes.

When measuring irregular objects, large-sized objects, multi-instrument integrated objects and other objects, the traditional strain gauge cannot accurately test the strain quantity, so the invention discloses a spliced integrated flexible strain gauge applicable to the irregular objects, the large-sized objects, the multi-instrument integrated objects and other objects, and the spliced integrated flexible strain gauge is used for solving the problems of difficult measurement and the like.

Disclosure of Invention

In order to solve the technical problems, the invention provides the spliced integrated flexible strain gauge which is accurate in measurement and high in applicability, and solves the problem that the strain capacity of an irregular object, a large object, a multi-instrument integrated object and other objects cannot be accurately tested when the irregular object, the large object, the multi-instrument integrated object and other objects are measured. The technical proposal is as follows:

1. the substrate is used for bearing the sensing part, the conducting part and the covering layer which are positioned on the upper surface of the substrate, wherein the sensing part and the conducting part which are positioned on the upper surface of the substrate are respectively a sensitive grid, and the conducting part is a lead.

2. The base is approximately rectangular, is 10mm long, 10mm wide and 2mm thick, is octagonal in shape, is used for preventing the edges from being worn and any bending deformation of the spliced integrated flexible strain gauge, is square for removing four edges, is used for enabling the spliced integrated flexible strain gauge to deform in multiple directions and multiple angles, and is not limited to deform in a single direction.

3. The sensing part is a sensitive grid which is arranged on the substrate in parallel and is adhered with the substrate. The leads are located in the connecting lines between each strain gage.

4. The whole is uppermost with a cover layer for protecting the sensing part and the conducting part of the single strain gage.

5. The leads are bonded in parallel to the strain gauge and the leads can be connected by connecting wires. The leads are used for mutual conduction between the signal output and the strain gauge. The left end, the right end, the upper end and the lower end of the connecting wire can enable the strain gauges to be mutually connected, and the lead wires can pass through the two ends of the connecting wire. The connecting lines of each individual strain gage are transversely arranged in two, and the connecting lines of each individual strain gage are longitudinally arranged in one. The transverse connecting lines are positioned at the upper end and the lower end of the strain grid, and the longitudinal connecting lines are positioned at the left side of the strain grid. Neither the transverse nor the longitudinal connection lines coincide with the strain gate.

6. Each common type can be spliced integrated type flexible strain gage is provided with a transverse circuit driver and a vertical circuit driver in a single set. The transverse circuit drive is connected with all the leads on the left side of the single set of the spliced integrated flexible strain gauge in the common model, and the vertical circuit drive is connected with all the leads on the lower side of the single set of the spliced integrated flexible strain gauge in the common model.

7. And each strain gauge is derived from the lead wire, is controlled in real time by a special circuit driving system, is subjected to time control data collection by a special singlechip, and accurately locates the position and the strain amount of each strain gauge.

8. The data is collected by the singlechip and is led into a computer for cloud image drawing for analysis.

Drawings

FIG. 1 is a schematic illustration of the structure of a single strain gage of the present invention.

Figure 2 is a schematic illustration of a single strain gage and cover layer of the present invention patent.

FIG. 3 is a partially integrated schematic illustration of a plurality of strain gages of the present invention.

Fig. 4 is a single set of common model splice-type integrated flexible strain gages of the present invention patent.

Fig. 5 is a schematic diagram of a typical model splice-type integrated flexible strain gage splice of the present invention with a large bulk substrate.

FIG. 6 is a schematic representation of a single collective bending deformation of a typical model splice-type integrated flexible strain gage of the present invention.

FIG. 7 is a schematic illustration of a plurality of sets of common model splice-type integrated flexible strain gages of the present invention.

FIG. 8 is a schematic representation of a plurality of collective bending deformations of a common model splice-type integrated flexible strain gage of the present invention.

Fig. 9 is a schematic diagram of a typical model splice-type integrated flexible strain gage single aggregate circuit drive system of the present invention.

In the figure, a substrate 1, a lead 2, a strain grid 3, a transverse connecting wire 4, a longitudinal connecting wire 5, a covering layer 6, a singlechip 7, a transverse circuit driving system 8 and a longitudinal circuit driving system 9

Detailed Description

In order that those skilled in the art can better understand the present invention, the following description of the technical solution of the present invention will be provided with reference to the accompanying drawings and examples.

As shown in fig. 1, 2 and 6, the flexible strain gage monolithic integrated in a spliced manner comprises a substrate 1, a lead 2, a strain grating 3, a transverse connecting wire 4, a longitudinal connecting wire 5 and a covering layer.

1. The sensing part is a strain grid 3;

2. The transverse connecting lines 4 and the longitudinal connecting lines 5 are shown in fig. 1 and 3, so that each strain gauge can be mutually connected and are combined into different shapes corresponding to different measuring environments;

3. The leads at the two ends transversely penetrate through the strain monolithic, the two ends of the connecting wire can pass through the lead wires.

4. The strain grating 3 is arranged on the substrate 1 in parallel;

5. the strain grating 3 and the substrate 1 are connected by adhesion;

6. after the connection and the combination are completed, all the transverse leads are connected with a transverse circuit driver 8, and all the vertical leads are connected with a vertical circuit driver 9. The horizontal and vertical circuit drives are connected with the special singlechip 7 to form a closed loop. As shown in fig. 9.

The spliced integrated flexible variable sheet provided by the invention is described in detail above.

Claims

1. A modular integrated flexible strain gauge, characterized in that: a substrate, a sensing portion and a conducting portion located on the upper surface of the substrate, wherein the substrate is octagonal to prevent wear of the edges and corners and arbitrary bending deformation of the modular integrated flexible strain gauge; the sensing portion is a sensitive grid; the sensitive grid is placed parallel to the substrate and bonded to the substrate; the top layer of the whole is a covering layer for protecting the individual strain gauge circuitry;

a. Substrate: Used to support the sensing and conducting parts and the covering layer located on the upper surface of the substrate;

b. The sensing and conducting parts located on the upper surface of the substrate: the sensing part is a sensitive grid, and the conducting part is a lead wire;

c. Shape: The base is octagonal to prevent wear on the edges and corners, and to allow the modular integrated flexible strain gauge to be bent and deformed arbitrarily;

d. Connection section: The lead wires are located in the connection lines between each strain gauge; there are two horizontal connection lines and one vertical connection line for each individual strain gauge; the horizontal connection lines are located at the top and bottom of the strain gauge, and the vertical connection line is located on the left side of the strain gauge. Neither the horizontal nor the vertical connection lines coincide with the strain gauge.

e. Covering layer: Used to protect the sensing and conducting parts of an individual strain gauge;

f. A single assembly of modular integrated flexible strain gauges consists of 12 × 6 strain gauges, each of which can be disassembled and reassembled into a combination shape suitable for the environment; each single assembly of modular integrated flexible strain gauges is equipped with horizontal circuit drive and vertical circuit drive.

Lead wires are used for signal output and mutual conduction between strain gauges; there are two horizontal connecting wires, located above and below the strain gauge; there is one vertical connecting wire, located to the left of the strain gauge; the left and right ends and the top and bottom ends of the connecting wires can connect the strain gauges to each other, and the lead wires can pass through both ends of the connecting wires.

The shape of a single strain gauge is a square with its four corners removed, in order to enable the splicable integrated flexible strain gauge to deform in multiple directions and angles, no longer restricted to deformation in a single direction.

2. The splicable integrated flexible strain gauge according to claim 1, characterized in that the substrate is 10mm long, 10mm wide, and 2mm thick.

3. The splicable integrated flexible strain gauge according to claim 1, characterized in that the sensing grid and the lead wire are located above the substrate and bonded to the substrate.

4. The modular integrated flexible strain gauge according to claim 1, characterized in that its monitoring method is as follows:

S1. Data from each strain gauge is derived by leads, and the circuit-driven system controls the data in real time. The microcontroller collects the time-controlled data to accurately locate the position and strain of each strain gauge.

S2. The time control data is collected by a microcontroller, imported into a computer for cloud map drawing, and used for analysis.