CN110411618B - Point contact type flexible dynamometer - Google Patents
Point contact type flexible dynamometer Download PDFInfo
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- CN110411618B CN110411618B CN201810399639.XA CN201810399639A CN110411618B CN 110411618 B CN110411618 B CN 110411618B CN 201810399639 A CN201810399639 A CN 201810399639A CN 110411618 B CN110411618 B CN 110411618B
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- conductive fiber
- fiber bundle
- dynamometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
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- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention relates to a point-contact flexible dynamometer, which comprises a flexible cloth substrate, jacquard structures woven on two sides of the flexible cloth substrate, an upper conductive fiber bundle and a lower conductive fiber bundle, wherein the jacquard structures are arranged on the upper conductive fiber bundle and the lower conductive fiber bundle; two ends of the upper conductive fiber bundle are respectively fixed on the jacquard structures on two sides of the flexible cloth substrate; the lower conductive fiber bundles are woven on the flexible cloth substrate positioned below the upper conductive fiber bundles and are arranged in a relatively isolated mode with the upper conductive fiber bundles. The invention has the advantages of convenient use, strong anti-interference capability, cleanable property, low replacement cost, high resolution and high sensitivity.
Description
Technical Field
The invention relates to the technical field of force measuring equipment, in particular to a point-contact flexible dynamometer.
Background
The stress sensors of existing dynamometers are primarily based on the use of conductive metals. In the pressure sensors of the ergometer, however, some conductive metal sheets form two conductive layers which are separated by a continuous or discontinuous electrically non-conductive or partially conductive interlayer. The properties of a sensor of this construction can be a resistance variable, since the two conductive layers can be brought into contact with each other by pressure, which cannot be avoided by the interlayer, and the two conductive layers return to their original positions once the pressure has been removed. Such sensors are known as resistive sensors. In other types of sensors, the sensor may act as a capacitance variable of a capacitor, with an insulating or non-conductive layer interposed between two conductive layers. Since the distance between the electrodes or conductive layers of such designs also varies, the capacitance between the layers will also vary accordingly, and such sensors become capacitive sensors.
However, most of the sensors of the existing ergometers are based on the use of conductive metals, and no related technical solution is provided for textile sensors. The sensors based on conductive metal can be classified into photo-electric type, pressure-capacitance type and piezoresistive type, however, these sensors are prone to cause measurement errors due to factors such as light interference caused by environment, fog caused by air humidity, etc., and once the dynamometer based on these sensors is out of function, the cost for replacing the whole dynamometer is high. In addition, the conventional stress sensor has a relatively fixed structural style, so that the stress response threshold is mostly a fixed value. Such sensors are susceptible to interference by ambient noise (vibration, airflow disturbances, etc.) located near their threshold values, causing spurious signals, and a currently preferred solution is to achieve adjustable threshold values, but few sensors are capable of this function.
Disclosure of Invention
Based on this, the invention aims to overcome the defects in the prior art and provide a point-contact flexible dynamometer which has the advantages of convenient use, strong anti-interference capability, cleanability, low replacement cost, high resolution and high sensitivity.
In order to achieve the purpose, the invention adopts the technical scheme that:
a point-contact flexible dynamometer comprises a flexible cloth substrate, jacquard structures woven on two sides of the flexible cloth substrate, an upper conductive fiber bundle and a lower conductive fiber bundle; two ends of the upper conductive fiber bundle are respectively fixed on the jacquard structures on two sides of the flexible cloth substrate; the lower conductive fiber bundles are woven on the flexible cloth substrate positioned below the upper conductive fiber bundles and are arranged in a relatively isolated mode with the upper conductive fiber bundles.
Therefore, in the point-contact flexible dynamometer provided by the invention, the two conductive fiber bundles are oppositely arranged in an isolated manner and have a certain distance, and the magnitude of the external stress response threshold value can be artificially adjusted by regulating the isolated distance, so that the sensor can shield the interference caused by some environments or non-detection objects, such as the flow of air, the vibration of the ground and the like. Wherein, the resistance based on the conductive fiber yarns is constructed by utilizing an upper conductive fiber bundle and a lower conductive fiber bundle; in the dynamometer, when the upper conductive fiber bundle is subjected to an external force, the conductive fiber yarns of the two conductive fiber bundles are mutually contacted, so that the contact state of the conductive fiber bundles is changed, the dynamometer has resistance drops in different degrees, and the change rate of the resistance is measured so as to induce the magnitude of the force applied to the dynamometer. In addition, the dynamometer of the invention also utilizes the conductivity of the conductive fiber, and can be used as a lead without an additional lead, thereby reducing the complexity of the device.
In order to achieve better technical effects, a further technical improvement comprises that the upper conductive fiber bundle and the lower conductive fiber bundle are respectively electrically connected with an external circuit through leads.
In order to achieve better technical results, a further technical improvement comprises that the length of the lower conductive fiber bundle is smaller than that of the upper conductive fiber bundle.
In order to achieve better technical effects, further technical improvements include that the upper conductive fiber bundle and the lower conductive fiber bundle comprise a plurality of conductive fiber filaments, and a plurality of gaps exist among the plurality of conductive fiber filaments; when the upper conductive fiber bundle is contacted with the lower conductive fiber bundle by an external force, the number of conduction current channels formed between the conductive fiber yarns which are contacted with each other and the gaps between the conductive fiber yarns are correspondingly changed along with the change of the external force.
In order to achieve better technical effects, further technical improvements include that the conductive fiber filaments are made of carbon, metal or conductive polymer materials.
In order to achieve better technical results, a further technical improvement comprises that the number of the plurality of conductive fiber filaments is more than 15.
In order to achieve better technical effects, a further technical improvement comprises that the lower layer conductive fiber bundle is fixed on the flexible cloth substrate through a textile knot.
In order to achieve better technical effect, further technical improvement comprises that the flexible cloth substrate is a non-conductive material which can be hemp, mulberry silk, terylene, plain cloth, fine cloth, silk or flannelette.
Drawings
Fig. 1 is a schematic structural diagram of a point-contact flexible dynamometer according to the present invention.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references in mind, one of ordinary skill in the art will understand the principles of the invention and its attendant advantages.
Please refer to fig. 1, which is a schematic structural diagram of a point-contact flexible dynamometer according to the present invention.
The invention discloses a point-contact flexible dynamometer, which comprises a flexible cloth substrate 10, jacquard structures 20 woven on two sides of the flexible cloth substrate 10, an upper conductive fiber bundle 30 and a lower conductive fiber bundle 40; two ends of the upper conductive fiber bundle 30 are respectively fixed on the jacquard structures 20 at two sides of the flexible cloth substrate 10; the lower conductive fiber bundle 40 is woven on the flexible cloth substrate 10 below the upper conductive fiber bundle 30 and is relatively isolated from the upper conductive fiber bundle 30; the upper conductive fiber bundle 30 is in contact with the lower conductive fiber bundle 40 when an external force is applied thereto. Wherein, the upper conductive fiber bundle 30 and the lower conductive fiber bundle 40 are electrically connected with an external circuit through a lead 60 respectively; in addition, in the present embodiment, it is preferable that the length of the lower conductive fiber bundle 40 is smaller than the length of the upper conductive fiber bundle 30.
Specifically, the upper conductive fiber bundle 30 and the lower conductive fiber bundle 40 include a plurality of conductive fiber filaments 50, and a plurality of gaps exist between the plurality of conductive fiber filaments 50; when the upper conductive fiber bundle 30 is contacted with the lower conductive fiber bundle 40 by an external force, the number of the conductive fiber filaments 50 contacted with each other and the gap between the conductive fiber filaments 50 are changed accordingly as the external force is changed. The conductive fiber filaments 50 are made of carbon, metal or conductive polymer materials, and the number of the conductive fiber filaments 50 is more than 15.
In this embodiment, preferably, the lower conductive fiber bundle 40 is fixed on the flexible cloth substrate 10 by a textile knot; the flexible cloth substrate 10 is a non-conductive material, which may be hemp, mulberry silk, terylene, plain cloth, fine cloth, silk or flannelette.
The working principle of the point-contact flexible dynamometer of the present invention is explained as follows:
first, in the point-contact flexible dynamometer of the present invention, the upper conductive fiber bundle 30 and the lower conductive fiber bundle 40 are spaced apart from each other and have a certain distance therebetween, and the magnitude of the external stress response threshold of the dynamometer can be changed by changing the distance therebetween.
Next, the load cell of the present invention is designed as a resistance sensor of the load cell of the present invention by using a structure in which the upper conductive fiber bundle 30 and the lower conductive fiber bundle 40 are relatively spaced apart. Specifically, by using the conductive fiber bundle composed of the plurality of conductive fiber filaments 50, contact occurs between the upper conductive fiber bundle 30 and the lower conductive fiber bundle 40 when downward external pressure is applied thereto, and the number of conduction current paths formed between the conductive fiber filaments 50 in contact with each other and the gaps between the conductive fiber filaments 50 are changed accordingly as the external force is changed. At this time, the resistance of the resistance sensor decreases to different degrees along with the increase of the external force, and the corresponding relationship between the change rate of the resistance sensor and the magnitude of the external force is mainly embodied in that when the upper conductive fiber bundle 30 and the lower conductive fiber bundle 40 are contacted with each other, the number of the conduction current channels formed between the conductive fiber filaments 50 between the two and the gap between the conductive fiber filaments 50 are both corresponding to the magnitude of the external force; after the external force is removed, the upper conductive fiber bundles 30 and the lower conductive fiber bundles 40 are restored to the original states, respectively.
Compared with the prior art, in the point-contact flexible dynamometer, the two conductive fiber bundles are oppositely arranged in an isolated manner and have a certain distance, and the magnitude of the external stress response threshold value can be manually adjusted by regulating and controlling the isolated distance, so that the sensor can shield interference caused by some environments or non-detection objects, such as air flow, ground vibration and the like. Wherein, the resistance based on the conductive fiber yarns is constructed by utilizing an upper conductive fiber bundle and a lower conductive fiber bundle; in the dynamometer, when the upper conductive fiber bundle is subjected to an external force, the conductive fiber yarns of the two conductive fiber bundles are mutually contacted, so that the contact state of the conductive fiber bundles is changed, the dynamometer has resistance drops in different degrees, and the change rate of the resistance is measured so as to induce the magnitude of the force applied to the dynamometer. In addition, the dynamometer of the invention also utilizes the conductivity of the conductive fiber, can be used as a lead without an additional lead, thereby reducing the dependence of the device on the traditional metal lead as much as possible, and has the advantages of low cost, convenient replacement and good market popularization value.
The above examples merely represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention of the point-contact flexible dynamometer. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (7)
1. A point-contact flexible dynamometer, characterized by: the jacquard weaving device comprises a flexible cloth substrate, jacquard structures woven on two sides of the flexible cloth substrate, an upper conductive fiber bundle and a lower conductive fiber bundle; two ends of the upper conductive fiber bundle are respectively fixed on the jacquard structures on two sides of the flexible cloth substrate; the lower conductive fiber bundle is woven on the flexible cloth substrate positioned below the upper conductive fiber bundle and is relatively isolated from the upper conductive fiber bundle; the upper conductive fiber bundle and the lower conductive fiber bundle comprise a plurality of conductive fiber yarns, and a plurality of gaps are formed among the plurality of conductive fiber yarns; when the upper conductive fiber bundle is contacted with the lower conductive fiber bundle by an external force, the number of conduction current channels formed between the conductive fiber yarns which are contacted with each other and the gaps between the conductive fiber yarns are correspondingly changed along with the change of the external force.
2. The point-contact flexible dynamometer of claim 1, wherein: the upper conductive fiber bundle and the lower conductive fiber bundle are electrically connected with an external circuit through leads respectively.
3. The point-contact flexible dynamometer of claim 1, wherein: the length of the lower conductive fiber bundle is smaller than that of the upper conductive fiber bundle.
4. The point-contact flexible dynamometer of claim 1, wherein: the conductive fiber yarn is made of carbon, metal or conductive polymer materials.
5. The point-contact flexible dynamometer of claim 1, wherein: the number of the plurality of conductive fiber filaments is more than 15.
6. The point-contact flexible dynamometer of claim 1, wherein: the lower layer conductive fiber bundle is fixed on the flexible cloth substrate through a textile knot.
7. The point-contact flexible dynamometer of claim 1, wherein: the flexible cloth substrate is a non-conductive material which can be hemp, mulberry silk, terylene, plain cloth, fine cloth, silk or flannelette.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810399639.XA CN110411618B (en) | 2018-04-28 | 2018-04-28 | Point contact type flexible dynamometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810399639.XA CN110411618B (en) | 2018-04-28 | 2018-04-28 | Point contact type flexible dynamometer |
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| CN110411618A CN110411618A (en) | 2019-11-05 |
| CN110411618B true CN110411618B (en) | 2021-05-11 |
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2727221A1 (en) * | 1977-06-16 | 1978-12-21 | Kuhn Goetz Gerd Prof Dr Med | Physiological pressure transducer using elastomeric resistance - has element sandwiched between base and load plates forming electrical contacts |
| CN1286000C (en) * | 2000-04-03 | 2006-11-22 | 布鲁内尔大学 | Conductive pressure sensitive textile |
| JP2010014694A (en) * | 2008-06-04 | 2010-01-21 | Nissan Motor Co Ltd | Load detection fiber |
| CN101393058A (en) * | 2008-11-03 | 2009-03-25 | 东华大学 | Flexible resistance type pressure sensor with machine-weaved structure and use thereof |
| DE102009029021B4 (en) * | 2009-08-31 | 2022-09-22 | Robert Bosch Gmbh | Sensor system for monitoring the surroundings of a mechanical component and a method for controlling and evaluating the sensor system |
| JP5871129B2 (en) * | 2012-02-13 | 2016-03-01 | 日産自動車株式会社 | Cloth pressure sensor |
| US9494474B2 (en) * | 2013-04-03 | 2016-11-15 | Texavie Technologies Inc. | Core-shell nanofiber textiles for strain sensing, and methods of their manufacture |
| WO2014204323A1 (en) * | 2013-06-17 | 2014-12-24 | Stretchsense Limited | Stretchable fabric sensors |
| KR102432009B1 (en) * | 2015-09-03 | 2022-08-12 | 엘지이노텍 주식회사 | Pressure sensor |
| CN107144379A (en) * | 2017-04-28 | 2017-09-08 | 东华大学 | A kind of resistive pressure is distributed fabric sensor |
| CN107142554B (en) * | 2017-06-28 | 2023-08-08 | 棉联（北京）网络科技有限公司 | Piezoresistive fiber, yarn, piezoresistive sensor and fabric |
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