CN111256880A - Pressure sensing fabric and pressure detection system - Google Patents
Pressure sensing fabric and pressure detection system Download PDFInfo
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- CN111256880A CN111256880A CN201811466854.3A CN201811466854A CN111256880A CN 111256880 A CN111256880 A CN 111256880A CN 201811466854 A CN201811466854 A CN 201811466854A CN 111256880 A CN111256880 A CN 111256880A
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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
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
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Abstract
The invention provides a pressure sensing fabric and a pressure detection system, and the pressure sensing fabric is provided with a sensing array through the structural design of the pressure sensing fabric, becomes a capacitive pressure distribution test fabric, and can achieve higher sensing sensitivity. In addition, through the attached elastomer material or the foam material on the first layer, the second layer and/or the isolation layer, the compression recovery performance of the pressure sensing fabric is effectively improved, the compression recovery speed is accelerated, the repeated use by a user in a short time is facilitated, and the process is simple.
Description
Technical Field
The invention relates to the technical field of textiles, in particular to a pressure sensing fabric and a pressure detection system.
Background
At present, most of the conventional pressure sensing fabrics are of a resistance type, for example, the upper layer and the lower layer of the pressure sensing fabric disclosed in chinese patent application CN108593157A are a positive electrode layer and a negative electrode layer, respectively, the middle layer is a conductive layer, the positive electrode layer and the negative electrode layer are both composed of a plurality of conductive yarns and non-conductive yarns, and the positive electrode can be conducted with the negative electrode through the conductive layer under the condition of a pressure and large-area sensor, so as to realize the function of detecting pressure. For another example, in chinese patent application CN108035032A, carbon nanotube yarn is woven into the upper yarn layer along the warp and weft directions, and the carbon nanotube yarn is interwoven to form a conductive network, i.e., a pressure sensing layer; and (3) interweaving the upper yarn layer and the lower yarn layer by adopting spacing yarns to form the three-dimensional spacing sensing fabric. When the fabric surface is pressed, the fabric with the spacing structure generates larger deformation, and the carbon nano tube yarns in the pressure sensing layer deform to cause resistance change. However, conventional resistive pressure sensing fabrics do not achieve good sensitivity. The capacitive pressure sensing fabric is slow in deformation recovery after the material is pressed, poor in compression recovery performance, and cannot accurately and stably test pressure distribution after waiting for a certain time to be used for the next time after being used for one time. For another example, in chinese patent application CN102002791B, the surface and the inner layers of the double-layer fabric form two plates of a capacitor, and the distance between the surface and the inner layers changes when the fabric is pressed, so that the capacitance of the fabric changes, and the sensing of the fabric to the external pressure is reflected by testing the change of the capacitance of the fabric. The pressure sensor can only be used as one sensor for testing, and when a device for testing pressure distribution needs to be made, a plurality of sensors are needed, and the process is complex.
In view of the deficiencies of the pressure sensing fabrics of the prior art, those skilled in the art are constantly seeking solutions.
Disclosure of Invention
The invention aims to provide a pressure sensing fabric and a pressure detection system, which are used for solving the problems of the pressure sensing fabric in the prior art.
To solve the above technical problem, the present invention provides a pressure sensing fabric, comprising: a first layer, a second layer and at least one spacing layer disposed between the first layer and the second layer; the first layer comprises a plurality of conductive yarns distributed along a first direction, at least one insulating yarn distributed along the first direction and arranged between two adjacent conductive yarns, and a plurality of insulating yarns interwoven with the conductive yarns and the insulating yarns distributed along the first direction and distributed along a second direction; the second layer comprises a plurality of conductive yarns distributed along the second direction, at least one insulating yarn distributed along the second direction and arranged between two adjacent conductive yarns, and a plurality of insulating yarns interwoven with the conductive yarns and the insulating yarns distributed along the second direction and distributed along the first direction; the first direction and the second direction are staggered, and the intersection points of the conductive yarns in the first layer and the conductive yarns in the second layer form induction points when the conductive yarns in the first layer and the conductive yarns in the second layer are in extrusion contact.
Optionally, in the pressure sensing fabric, each interlayer includes a plurality of insulating yarns distributed along the first direction, and a plurality of insulating yarns interwoven with the insulating yarns distributed along the second direction, a plurality of insulating yarns distributed along the first direction, or a plurality of insulating yarns distributed along the second direction.
Optionally, in the pressure sensing fabric, the conductive yarn is a linear conductive yarn or a curved conductive yarn, and the insulating yarn is a linear insulating yarn or a curved insulating yarn.
Optionally, in the pressure sensing fabric, the arrangement ratio of the conductive yarns to the insulating yarns in the first layer or the second layer is 1: 1.
optionally, the pressure sensing fabric further includes an attachment material attached to the first layer, the second layer and/or the isolation layer, and the attachment material is an elastomer material or a foam material.
Optionally, in the pressure sensing fabric, the elastomer material is one or a combination of more of silica gel, rubber, styrenes, polyurethanes, polyolefins, and polyamides; the foaming material is one or a combination of more of EVA, PE, PVC, PET, PU and PS.
Optionally, in the pressure sensing fabric, the first direction is orthogonal to the second direction.
The present invention also provides a pressure detection system, comprising: the pressure sensing fabric is arranged on a detected product, senses capacitance variation data of all sensing points when the detected product is subjected to external pressure, and sends the capacitance variation data to the mainboard; the mainboard obtains pressure information of a detected product according to the capacitance variation data and sends the pressure information to the terminal electronic equipment; and the terminal electronic equipment generates a pressure analysis report according to the pressure information.
Optionally, in the pressure detection system, the main board includes: the system comprises a main control chip, and a touch signal processing module, a power management module, a battery charging module, an I2C communication module, the main control chip and a Bluetooth module which are respectively connected with the main control chip;
the main control chip is used for regulating and controlling the running state of each module;
the touch signal processing module receives capacitance variation data sent by the pressure sensing fabric through an I2C communication module, obtains pressure information received by a detected product according to the capacitance variation data, and sends the pressure information to the terminal electronic equipment through the Bluetooth module;
the power supply management module is used for monitoring and managing power supply signals;
and the battery charging module is used for charging the storage battery.
Optionally, in the pressure detection system, the detected product is an insole, a mattress, a cushion or a backrest.
In the pressure sensing fabric and the pressure detection system provided by the invention, through the structural design of the pressure sensing fabric, the pressure sensing fabric provided by the invention is provided with the sensing array, becomes a capacitive pressure distribution test fabric and can achieve higher sensing sensitivity. In addition, through the attached elastomer material or the foam material on the first layer, the second layer and/or the isolation layer, the compression recovery performance of the pressure sensing fabric is effectively improved, the compression recovery speed is accelerated, the repeated use by a user in a short time is facilitated, and the process is simple.
Drawings
FIG. 1 is a schematic three-dimensional structure of a pressure sensing fabric according to an embodiment of the present invention;
FIG. 2 is a schematic representation of the layer structure of a pressure sensing fabric in one embodiment of the present invention;
FIG. 3 is a schematic representation of the positional relationship of the conductive yarns in the first layer and the second layer of FIG. 2;
FIG. 4 is a flow chart of the operation of the pressure sensing system in one embodiment of the present invention;
FIG. 5 is a schematic view of the area of the pressure sensing fabric where the product being tested is an insole;
FIG. 6 is a schematic view of the area of the pressure sensing fabric where the product being tested is a mattress;
fig. 7 is a schematic view of the area where the pressure sensing fabric is installed when the products to be tested are a seat cushion and a backrest.
The reference numbers in the figures illustrate:
in fig. 1: 101-a pressure sensing fabric; 102-a first layer; 103-a second layer; 104-a spacer layer; 1002, 1003-conductive yarn; 1004, 1005-insulating yarn;
in fig. 2: 201-a pressure sensing fabric; 202-first layer; 203-a second layer; 204-a spacer layer;
in fig. 3: 301, 302-conductive yarns;
in fig. 5: 501-insole; 502-pressure sensing fabric mounting area;
in fig. 6: 601-a mattress; 602-a pressure sensing fabric mounting area; 603-routing area; 604-a circuit board; 605-a main board;
in fig. 7: 702-a backrest; 703-cushion; 704, 705-pressure sensing fabric mounting area; 706, 707-routing area; 708-a connection area.
Detailed Description
The pressure sensing fabric and the pressure detecting system according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The present invention will be described in more detail with reference to the accompanying drawings, in order to make the objects and features of the present invention more comprehensible, embodiments thereof will be described in detail below, but the present invention may be implemented in various forms and should not be construed as being limited to the embodiments described.
Example one
Please refer to fig. 1, which is a schematic three-dimensional structure diagram of the pressure sensing fabric of the present invention. As shown in fig. 1, the pressure sensing fabric 101 of the present invention comprises: a first layer 102, a second layer 103, and at least one spacing layer 104 disposed between the first layer 102 and the second layer 103, preferably two spacing layers 104 in this embodiment; the first layer 102 comprises a plurality of conductive yarns 1002 distributed along a first direction, at least one insulating yarn 1004 distributed along the first direction and arranged between two adjacent conductive yarns 1002, and a plurality of insulating yarns 1005 distributed along a second direction and interwoven with the conductive yarns 1002 and the insulating yarns 1004 distributed along the first direction; the second layer 103 comprises a plurality of conductive yarns 1003 distributed along the second direction, at least one insulating yarn 1005 (which avoids the contact between the two adjacent conductive yarns 1003) distributed along the second direction and arranged between the two adjacent conductive yarns 1003, and a plurality of insulating yarns 1004 distributed along the first direction and interwoven with the conductive yarns 1003 and the insulating yarn 1005 distributed along the second direction; the first direction and the second direction are staggered, and the intersection points of the conductive yarns 1002 in the first layer 102 and the conductive yarns 1003 in the second layer 103 form sensing points when being in pressing contact. In order to prevent the first layer 102 and the second layer 103 from being damaged by external contact, a protective layer formed by weaving insulating yarns is provided above the first layer 102 and below the second layer 103. Preferably, the first direction and the second direction are arranged orthogonally to each other.
Furthermore, each interlayer comprises a plurality of insulating yarns distributed along the first direction and a plurality of insulating yarns interwoven with the insulating yarns distributed along the second direction, a plurality of insulating yarns distributed along the first direction or a plurality of insulating yarns distributed along the second direction. As shown in fig. 1, the interlayer in this embodiment is two layers, wherein one layer of interlayer is formed by laying a plurality of insulating yarns 1004 distributed along a first direction; the other interlayer is formed by laying several insulating yarns 1005 (the same color line in fig. 1 represents the same type of yarn) distributed in the second direction. The spacing layer can also be formed by weaving middle spacing wires, and can be made of traditional materials such as nylon, nylon 66 and the like.
Further, the conductive yarns are linear conductive yarns or curved conductive yarns, and the insulating yarns are linear insulating yarns or curved insulating yarns, as long as it is ensured that the conductive yarns in the first layer are interlaced with the conductive yarns in the second layer (so that the conductive yarns contact to form intersections in the two layers being squeezed). In this embodiment, the conductive yarn is a linear conductive yarn, the insulating yarn is a linear insulating yarn, and the conductive yarn in the first layer and the conductive yarn in the second layer are orthogonally arranged; the arrangement ratio of the conductive yarns to the insulating yarns in the first layer or the second layer is 1: 1. it is understood that the arrangement ratio of the conductive yarn to the insulating yarn in the first layer or the second layer of the present invention includes, but is not limited to, 1: 1, can be adjusted according to actual needs.
Preferably, the conductive yarn can be a metal yarn, a silver-plated yarn or a carbon fiber yarn; the insulating yarn can be natural fiber yarn or chemical fiber yarn, and the weaving method of the three-dimensional pressure sensing fabric adopts a traditional weaving method, and the redundant description is not repeated here.
Preferably, after the pressure sensing fabric is woven, an attachment material is attached to the first layer, the second layer and/or the isolation layer, the attachment material is attached in an over-impregnated or filling manner, and the attachment material is preferably an elastomer material or a foam material; wherein the elastomer material is one or a combination of more of silica gel, rubber, styrene, polyurethanes, polyolefins and polyamides; the foaming material is one or a combination of more of EVA, PE, PVC, PET, PU and PS. Due to the existence of the adhesive material, the compression recovery of the pressure sensing fabric is obviously improved, the compression recovery speed is accelerated, and the repeated application of a user is facilitated.
Example two
For a better understanding of the pressure sensing fabric of the present invention, the three-dimensional structure is illustrated in detail as being simplified to a layer structure. Referring to fig. 2, as shown in fig. 2, the pressure sensing fabric 201 has a three-layer structure, i.e., a first layer 202, a spacer layer 204 and a second layer 203, which are stacked in sequence. For the specific yarn composition in each layer, please refer to fig. 1, and redundant description is omitted here. Referring to fig. 3, the first direction is a longitudinal direction, and the second direction is a second direction, so that the schematic positional relationship between the conductive yarn 301 in the first layer 202 and the conductive yarn 302 in the second layer 203 in fig. 2 can be intuitively known from fig. 3, that is, the two are orthogonally arranged.
EXAMPLE III
The invention also provides a pressure detection system. The pressure detecting system of the present invention will be described in detail with reference to fig. 4 to 7.
Referring to fig. 4, the pressure detecting system includes: at least one pressure sensing fabric, a main board and a terminal electronic device as described in the first or second embodiment, wherein the pressure sensing fabric is installed on a detected product, senses capacitance variation data of all sensing points when the detected product is subjected to external pressure, and sends the capacitance variation data to the main board; the mainboard obtains pressure information of a detected product according to the capacitance variation data and sends the pressure information to the terminal electronic equipment; and the terminal electronic equipment generates a pressure analysis report according to the pressure information.
Specifically, the main board includes: the system comprises a main control chip, and a touch signal processing module, a power management module, a battery charging module, an I2C communication module, the main control chip and a Bluetooth module which are respectively connected with the main control chip; the main control chip is used for regulating and controlling the running state of each module; the touch signal processing module receives capacitance variation data sent by the pressure sensing fabric through an I2C communication module, obtains pressure information received by a detected product according to the capacitance variation data, and sends the pressure information to the terminal electronic equipment through the Bluetooth module; the power supply management module is used for monitoring and managing power supply signals; the battery charging module is used for charging the storage battery.
For better understanding of the operation of the pressure detecting system, the following description will be made in detail by taking the detected products as an insole, a mattress, and a cushion and a backrest, respectively.
Example 1: the detected product is a shoe pad
Because the insole is irregular in shape, the pressure sensing fabric needs to be arranged on the insole in a partitioning mode so as to display the pressure distribution of the whole foot. As shown in fig. 5, a plurality of pressure sensing fabric mounting areas 502 are arranged to occupy different areas of the insole 501, the pressure sensing fabrics mounted on all the mounting areas 502 are connected to a circuit board through wires, the circuit board is connected to a main board, the main board receives capacitance variation data of all sensing points on all the pressure sensing fabrics when the insole is subjected to external pressure, analyzes the capacitance variation data to obtain pressure information of the insole, obtains pressure distribution data of the whole foot, and sends the pressure distribution data to the terminal electronic device, and the terminal electronic device analyzes and summarizes the pressure information and further obtains an analysis report. The circuit board can be flexible or hard; the circuit board and the outer layer of the mainboard are coated with waterproof packaging, and the coating material can be silica gel, rubber, styrene, polyurethane, polyolefin, polyamide and the like. The working frequency of the main board is 50 Hz.
Example 2: the detected product is a mattress
As shown in fig. 6, a pressure sensing fabric is installed on a pressure sensing fabric installation region 602 of a mattress 601, the routing of the pressure sensing fabric is led out through a reserved routing region 603 and welded on a circuit board 604 at the right end, the circuit board 604 is connected with a main board 605, the main board receives capacitance variation data of all sensing points on all pressure sensing fabrics when the mattress is sensed to be subjected to external pressure, and analyzes and obtains pressure information received by the mattress to obtain pressure distribution data of the whole mattress, and sends the pressure distribution data to terminal electronic equipment, and the terminal electronic equipment analyzes and summarizes the pressure distribution data, and further obtains an analysis report. The circuit board and the main board are arranged at the right end of the mattress, but not limited to the right end, and can be arranged at any end of the mattress. The circuit board can be flexible or hard; the circuit board and the outer layer of the mainboard are coated with waterproof packaging, and the coating material can be silica gel, rubber, styrene, polyurethane, polyolefin, polyamide and the like.
Example 3: the detected products are a cushion and a backrest
As shown in fig. 7, a pressure sensing fabric is mounted in a backrest 702 on a pressure sensing fabric mounting area 704 and in a cushion 703 on a pressure sensing fabric mounting area 705; the traces of the pressure sensing fabrics installed on the backrest 702 and the cushion 703 are respectively connected to the circuit board installed on the connection area 708 through the reserved trace area 706 and the trace area 707 by leads, and further connected to the main board; the mainboard receives the capacitance variation data of all sensing points on all pressure sensing fabrics when sensing cushion and back receive external pressure, and the analysis obtains the pressure information that cushion and back received, in order to obtain the pressure distribution data of whole cushion and back, and sends pressure distribution data for terminal electronic equipment, and terminal electronic equipment carries out the analysis summary, and further reachs the analysis report. Since the connection region 708 is not pressed by a human body, the circuit board and the main board are not damaged.
In summary, in the pressure sensing fabric and the pressure detection system provided by the invention, through the structural design of the pressure sensing fabric, the pressure sensing fabric of the invention has a sensing array, becomes a capacitive pressure distribution test fabric, and can achieve higher sensing sensitivity. In addition, through the attached elastomer material or the foam material on the first layer, the second layer and/or the isolation layer, the compression recovery performance of the pressure sensing fabric is effectively improved, the compression recovery speed is accelerated, the repeated use by a user in a short time is facilitated, and the process is simple.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (10)
1. A pressure sensing fabric, comprising: a first layer, a second layer and at least one spacing layer disposed between the first layer and the second layer; the first layer comprises a plurality of conductive yarns distributed along a first direction, at least one insulating yarn distributed along the first direction and arranged between two adjacent conductive yarns, and a plurality of insulating yarns interwoven with the conductive yarns and the insulating yarns distributed along the first direction and distributed along a second direction; the second layer comprises a plurality of conductive yarns distributed along the second direction, at least one insulating yarn distributed along the second direction and arranged between two adjacent conductive yarns, and a plurality of insulating yarns interwoven with the conductive yarns and the insulating yarns distributed along the second direction and distributed along the first direction; the first direction and the second direction are staggered, and the intersection points of the conductive yarns in the first layer and the conductive yarns in the second layer form induction points when the conductive yarns in the first layer and the conductive yarns in the second layer are in extrusion contact.
2. The pressure sensing fabric of claim 1, wherein each interlayer comprises a plurality of insulating yarns running in a first direction and a plurality of insulating yarns running in a second direction, a plurality of insulating yarns running in the first direction, or a plurality of insulating yarns running in the second direction interwoven therewith.
3. The pressure sensing fabric of claim 1 or 2, wherein the conductive yarns are linear conductive yarns or curvilinear conductive yarns and the insulating yarns are linear insulating yarns or curvilinear insulating yarns.
4. The pressure sensing fabric of claim 1, wherein the conductive yarns and the insulating yarns in the first or second layer are arranged in a ratio of 1: 1.
5. the pressure sensing fabric of claim 1, further comprising an attachment material attached to the first layer, the second layer, and/or the isolation layer, wherein the attachment material is an elastomeric material or a foam material.
6. The pressure sensing textile of claim 5, wherein the elastomeric material is one or more combinations of silicone, rubber, styrenics, polyurethanes, polyolefins, polyamides; the foaming material is one or a combination of more of EVA, PE, PVC, PET, PU and PS.
7. The pressure sensing fabric of claim 1, wherein the first direction is orthogonally disposed to the second direction.
8. A pressure sensing system, comprising: at least one pressure sensing fabric, a main board and a terminal electronic device as claimed in any one of claims 1 to 7, wherein the pressure sensing fabric is mounted on a detected product, senses capacitance variation data of all sensing points when the detected product is subjected to external pressure, and sends the capacitance variation data to the main board; the mainboard obtains pressure information of a detected product according to the capacitance variation data and sends the pressure information to the terminal electronic equipment; and the terminal electronic equipment generates a pressure analysis report according to the pressure information.
9. The pressure sensing system of claim 8, wherein the main plate comprises: the system comprises a main control chip, and a touch signal processing module, a power management module, a battery charging module, an I2C communication module, the main control chip and a Bluetooth module which are respectively connected with the main control chip;
the main control chip is used for regulating and controlling the running state of each module;
the touch signal processing module receives capacitance variation data sent by the pressure sensing fabric through an I2C communication module, obtains pressure information received by a detected product according to the capacitance variation data, and sends the pressure information to the terminal electronic equipment through the Bluetooth module;
the power supply management module is used for monitoring and managing power supply signals;
and the battery charging module is used for charging the storage battery.
10. The pressure sensing system of claim 8, wherein the sensed product is a shoe insole, a mattress, a cushion, or a backrest.
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| CN201811466854.3A CN111256880A (en) | 2018-12-03 | 2018-12-03 | Pressure sensing fabric and pressure detection system |
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| CN201811466854.3A CN111256880A (en) | 2018-12-03 | 2018-12-03 | Pressure sensing fabric and pressure detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112515326A (en) * | 2020-12-02 | 2021-03-19 | 王铭衡 | Backpack with point-contact-type wearable pressure sensor |
| CN112693717A (en) * | 2020-12-11 | 2021-04-23 | 惠州市美盛隆科技有限公司 | Tank structure with detection function |
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Application publication date: 20200609 |