Flexible stress sensing device of full-textile materials

Abstract

A flexible stress sensing device is provided, which includes a flexible cloth substrate, a flexible stress sensor and textile knots configured to fix the flexible stress sensor on the flexible cloth substrate. The flexible stress sensor includes two conductive fiber bundles, wherein each of the conductive fiber bundles is provided with a loose structure, and the loose structures of two conductive fiber bundles contact with each other and form a stress sensing unit. The flexible stress sensing device can be washable, is not easy to fall off, and can resist against motion interference, and has other advantages of high resolution, high sensitivity and a compatibility with the prior textile techniques.

Claims

1. A flexible stress sensing device comprising: a flexible cloth substrate; a flexible stress sensor including two conductive fiber bundles, wherein each of the conductive fiber bundles has a loose structure, and the loose structures of the two conductive fiber bundles contact with each other and form a stress sensing unit; and four textile knots configured to fix the flexible stress sensor on the flexible cloth substrate; wherein each loose structure includes multiple conductive filaments, and a plurality of gaps exist between the multiple conductive filaments; and in the stress sensing unit, an amount of conducting current paths formed between conductive filaments which contact with each other and gaps between conductive filaments are correspondingly changed along with a change of an external force.

2. The flexible stress sensing device of claim 1, wherein the flexible cloth substrate is a non-conductive material, which may be hemp, mulberry silk, polyester, plain cloth, fine cloth, silk or flannel.

3. The flexible stress sensing device of claim 1, wherein the loose structures of the two conductive fiber bundles are mutually stacked in a crossed manner or are interspersed with each other or are in butt joint with each other.

4. The flexible stress sensing device of claim 1, wherein the stress sensing unit is fixed on the flexible cloth substrate via the four textile knots, and a distance between each textile knot and a center of the stress sensing unit is greater than 1 mm.

5. The flexible stress sensing device of claim 1, wherein the conductive filaments are carbon, metal or conductive polymer materials.

6. The flexible stress sensing device of claim 5, wherein the amount of the multiple conductive filaments of each loose structure is more than 10.

7. The flexible stress sensing device of claim 1, wherein the flexible stress sensor is connected with two wires which extend outwards.

Description

BRIEF DESCRIPTION

(1) Some of the embodiments will be described in detail, with references to the following Figures, wherein like designations denote like members, wherein:

(2) FIG. 1 is a structural schematic diagram of a flexible stress sensing device of full-textile materials of Embodiment 1;

(3) FIG. 2 is another schematic diagram of a flexible stress sensing device of full-textile materials of Embodiment 1;

(4) FIG. 3 is a structural schematic diagram of a flexible stress sensor of Embodiment 1;

(5) FIG. 4 is a structural schematic diagram of conductive fiber bundles of Embodiment 1;

(6) FIG. 5 is a stress response curve graph of a flexible stress sensing device of full-textile materials of embodiment 1 after multiple ultrasonic cleaning and drying;

(7) FIG. 6 is a structural schematic diagram of a flexible stress sensing device of full-textile materials of Embodiment 2; and

(8) FIG. 7 is a structural schematic diagram of a flexible stress sensing device of full-textile materials of Embodiment 3.

DETAILED DESCRIPTION

(9) For a further description of each embodiment, accompanying drawings are provided in embodiments of the present invention. These accompanying drawings are a part of the contents disclosed in embodiments of the present invention, and are mainly used for describing embodiments and explaining, in cooperation with related description of the description, operating principles of the embodiments. In cooperation with a reference to these contents, those skilled in the art should be capable of understanding other possible implementations and advantages of embodiments of the present invention.

Embodiment 1

(10) Please refer to FIG. 1 to FIG. 4 simultaneously.

(11) A flexible stress sensing device of full-textile materials of embodiments of the present invention comprises a flexible cloth substrate 10, a flexible stress sensor and textile knots 30 configured to fix the flexible stress sensor on the flexible cloth substrate 10, wherein the flexible stress sensor is electrically connected with an external circuit.

(12) The flexible cloth substrate 10 is a non-conductive material, which may be hemp, mulberry silk, polyester, plain cloth, fine cloth, silk or flannel.

(13) Specifically, the flexible stress sensor includes two conductive fiber bundles 20, wherein each of the conductive fiber bundles 20 is provided with a loose structure 21, and the loose structures 21 of the two conductive fiber bundles 20 are stacked with each other in a crossed manner and form a stress sensing unit 22. It should be noted that, in the stress sensing unit 22, the amount of conducting current paths formed between conductive filaments 211 which contact with each other and gaps between conductive filaments 211 are correspondingly changed along with the change of an external force.

(14) Wherein each loose structure 21 includes multiple conductive filaments 211, and multiple gaps exist between the multiple conductive filaments 211. The loose structures 21 of the two conductive fiber bundles 20 are stacked in a crossed manner to form a stress sensing unit 22.

(15) An included angle θ formed through crossed stacking of the two conductive fiber bundles 20 is in a range of 2° to 178°. In addition, the amount of the multiple conductive filaments 211 of each loose structure 21 is greater than 10; moreover, the conductive filaments 211 are carbon, metal or conductive polymer materials.

(16) Wherein, the two conductive fiber bundles 20 are respectively connected with two wires 40 which extend outwards.

(17) The number of the textile knots 30 is four. The flexible cloth substrate 10 is provided with a jacquard structure, the stress sensing unit 22 is fixed on the jacquard structure of the flexible cloth substrate 10 via the four textile knots 30, and the distance between each textile knot 30 and the center of the stress sensing unit 22 is greater than 1 mm.

(18) In addition, as shown in FIG. 5, after multiple ultrasonic cleaning and drying for as long as 60 min and under a pressure of 20 mN, the flexible stress sensing device of full-textile materials of embodiments of the present invention can still maintain its stress response performance before cleaning, thereby fully proving that the solution proposed in embodiments of the present invention is feasible and completely realizing a washable effect of devices.

(19) Working principles of the flexible stress sensor of full-textile materials of embodiments of the present invention are described below:

(20) Under the effect of an external force F1, the amount of conducting current paths formed between conductive filaments 211 which contact with each other on the surfaces of the two loose structures 21 is increased along with an increase of the external force, such that the resistance of the flexible stress sensor decreases sharply;

(21) When the external force F1 continuously increases to F2, the amount of conducting current paths formed between conductive filaments 211 which contact with each other on the surfaces of the two loose structures 21 reaches a maximum value; along with a further increase of F2, the size of the gap between conductive filaments 211 inside each loose structure 21 is gradually decreased, and the growth rate of the amount of conducting current paths formed between conductive filaments 211 which contact with each other is gradually lowered, such that the resistance of the flexible stress sensor is gradually decreased;

(22) When the external force F2 gradually increases to F3, the size of gaps formed between conductive filaments 211 of the stress sensing unit 22 and the amount of the formed conducting current paths have already been saturation values; even if the external force is still increased constantly, the resistance of the flexible stress sensor is no longer changed and has reached its saturation value;

(23) When the external force is removed, the whole structure of the flexible stress sensor recovers to its initial state, and the resistance recovers to its initial resistance;

(24) Wherein, F1, F2 and F3 are all external force values of different numeric values.

Embodiment 2

(25) As shown in FIG. 6, the present embodiment differs from embodiment 1 in that the loose structures 21 of the two conductive fiber bundles 20 in the present embodiment can also be interspersed with each other to form a stress sensing unit 22. It should be noted that, in the stress sensing unit 22, the amount of conducting current paths formed between conductive filaments 211 which contact with each other and gaps between conductive filaments 211 are correspondingly changed along with the change of an external force.

(26) Wherein, conductive filaments 211 of the stress sensing unit 22 are interspersed uniformly or non-uniformly, and multiple electric channels which are conducting or not conducting are formed.

Embodiment 3

(27) As shown in FIG. 7, the present embodiment differs from embodiment 1 in that the loose structures 21 of two conductive fiber bundles 20 in the present embodiment can also be in butt joint with each other to form a stress sensing unit 22. It should be noted that, in the stress sensing unit 22, the amount of conducting current paths formed between conductive filaments 211 which contact with each other and gaps between conductive filaments 211 are correspondingly changed along with the change of an external force.

(28) Although the invention has been illustrated and described in greater detail with reference to the preferred exemplary embodiment, the invention is not limited to the examples disclosed, and further variations can be inferred by a person skilled in the art, without departing from the scope of protection of the invention.

(29) For the sake of clarity, it is to be understood that the use of “a” or “an” throughout this application does not exclude a plurality, and “comprising” does not exclude other steps or elements.