Warp-knitted interval sensing fabric, preparation method and application thereof, pressure sensor, pressure sensing foot pad and plantar pressure value acquisition system

Abstract

The invention provides a warp-knitted interval sensing fabric and a preparation method and application thereof, a pressure sensor, a pressure sensing foot pad and a plantar pressure value acquisition system, and belongs to the technical field of flexible sensors. The warp-knitted interval sensing fabric comprises an electrode layer, a monofilament interval layer and a sensing layer which are sequentially laminated; the warp-knitted interval sensing fabric is of an integrally formed structure; the electrode layer is provided with a full-penetrating double-comb structure and comprises a plurality of conductive strips which are arranged in parallel, and an insulating strip is arranged between every two adjacent conductive strips; the monofilament spacing layer is formed by mutually connecting fiber coils, and the electrode layer and the sensing layer are connected through the fiber coils; the sensing layer has a full-penetration double-comb weave and is obtained by weaving sensing yarns. According to the warp-knitted spacer sensing fabric pressure sensor, the electrode layer, the monofilament spacer layer and the sensing layer are integrally formed, the process is simple, the cost is low, and large-scale production and practical application are facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible sensors, and particularly relates to a warp-knitted spacer sensing fabric, a preparation method and application thereof, a pressure sensor, a pressure sensing insole and a plantar pressure value acquisition system. Background Art

[0002] With the development of textile technology and the improvement of people's living standards, textiles are gradually developing towards functionalization and intelligence. In particular, intelligent electronic textiles that integrate multiple disciplines such as textiles, electronics, and computers endow textiles with the functions of perceiving and reacting to the outside world. Based on this, various types of monitoring systems have been designed in clothing such as shoes, insoles, and socks in the prior art to monitor various physiological parameters of the human body.

[0003] In the above monitoring system, the most important component for detecting physiological parameters is the sensor. At present, there are already some products that sew sensors on fabrics to detect data such as pressure generated during human movement. However, in the prior art, it is generally necessary to process and manufacture each layer of the sensor through multiple steps, and then composite each layer together by means of adhesion or sewing to form the sensor. The preparation process is complex and the manufacturing cost is high, making it difficult to be used in industrial production and practical applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a warp-knitted spacer sensing fabric, a preparation method and application thereof, a pressure sensor, a pressure sensing insole and a plantar pressure value acquisition system. The warp-knitted spacer sensing fabric provided by the present invention realizes the integrated forming of the electrode layer, the monofilament spacer layer and the sensing layer, with a simple process, low cost, and being convenient for large-scale production and practical application.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a warp-knitted spacer sensing fabric, which includes an electrode layer, a monofilament spacer layer and a sensing layer that are sequentially stacked, and the warp-knitted spacer sensing fabric is an integrated forming structure;

[0007] The electrode layer has a full-laid double-comb structure, including multiple conductive strips arranged in parallel, and an insulating strip is arranged between adjacent two conductive strips; the conductive strips are formed by conductive yarns, and the insulating strips are formed by insulating yarns;

[0008] The monofilament spacer layer is formed by connecting fiber coils to each other, and the fiber coils are formed by fiber monofilaments; the electrode layer and the sensing layer are connected by the fiber coils;

[0009] The sensing layer has a full-laid double-comb structure and is woven by sensing yarns.

[0010] Preferably, the conductive yarn includes at least one of copper wire, silver-plated yarn, carbon nanotube yarn, and graphene yarn; the width of each conductive strip is 5-10 mm, and the distance between two adjacent conductive strips is 4-10 mm;

[0011] The insulating yarn includes at least one of nylon yarn, polyester yarn, and cotton fiber; the width of each insulating strip is 4-10 mm, and the distance between two adjacent insulating strips is 5-10 mm;

[0012] The fabric structure of the electrode layer is double-jersey or double-pile weave.

[0013] Preferably, the fiber monofilament includes at least one of nylon monofilament, polyester monofilament, and polytrimethylene terephthalate fiber monofilament; the connection modes of the fiber coils include V-shaped, cross-shaped, parallel-shaped, or parallel-cross-shaped.

[0014] Preferably, the sensing yarn includes carbon black yarn; the breaking strength of the carbon black yarn is 4.0-6.0 cN / dtex, and the breaking elongation is 25-50%; the carbon black yarn is obtained by weaving polyester black yarn and carbon black conductive yarn; the fabric structure of the sensing layer is double-jersey.

[0015] The present invention provides a preparation method of the warp-knitted spacer sensing fabric described in the above technical solution, including the following steps:

[0016] Weaving the warp-knitted spacer sensing fabric on a double-needle bed warp knitting machine with at least six guide bars:

[0017] On the first two guide bars, the conductive yarn and the insulating yarn are alternately threaded to obtain an electrode layer with a full-threaded double-comb structure; the electrode layer includes alternately arranged conductive strips and insulating strips, and the conductive strips and the insulating strips are parallel to each other;

[0018] On the last two guide bars, the sensing yarn is woven to obtain a sensing layer with a full-threaded double-comb structure;

[0019] On the middle two guide bars, the fiber monofilaments are fully threaded, and the yarn is alternately laid on the front and rear needle beds to form loops, connecting the electrode layer and the sensing layer to obtain the warp-knitted spacer sensing fabric.

[0020] The present invention provides a pressure sensor based on a warp-knitted spacer sensing fabric, including a first warp-knitted spacer sensing fabric and a second warp-knitted spacer sensing fabric arranged in a stacked manner. The first warp-knitted spacer sensing fabric and the second warp-knitted spacer sensing fabric are independently the warp-knitted spacer sensing fabric described in the above technical solution or the warp-knitted spacer sensing fabric obtained by the preparation method described in the above technical solution. The sensing layer in the first warp-knitted spacer sensing fabric is in contact connection with the sensing layer in the second warp-knitted spacer sensing fabric.

[0021] Preferably, the direction of the conductive strips in the electrode layer of the first warp-knitted spacer sensing fabric is perpendicular to the direction of the conductive strips in the electrode layer of the second warp-knitted spacer sensing fabric.

[0022] The present invention provides an application of the pressure sensor based on the warp-knitted spacer sensing fabric described in the above technical solution in a flexible wearable device or a smart home appliance.

[0023] The present invention provides a pressure-sensing insole, which includes the pressure sensor based on the warp-knitted spacer sensing fabric described in the above technical solution.

[0024] The present invention provides a plantar pressure value acquisition system, which includes a signal acquisition device, a smart display terminal, and the pressure-sensing insole described in the above technical solution; the pressure-sensing insole is connected to the signal acquisition device, and the signal acquisition device is connected to the smart display terminal.

[0025] The present invention provides a warp-knitted spacer sensing fabric, which includes an electrode layer, a monofilament spacer layer, and a sensing layer arranged in a stacked manner in sequence. The warp-knitted spacer sensing fabric is an integrally formed structure; the electrode layer has a full-laid double-comb structure and includes a plurality of conductive strips arranged in parallel, and an insulating strip is arranged between two adjacent conductive strips; the conductive strips are formed by conductive yarns, and the insulating strips are formed by insulating yarns; the monofilament spacer layer is formed by connecting fiber coils, and the fiber coils are formed by fiber monofilaments; the electrode layer and the sensing layer are connected by the fiber coils; the sensing layer has a full-laid double-comb structure and is woven from sensing yarns. In the present invention, the insulating yarns can separate the conductive yarns to form conductive strips; the presence of the conductive yarns in the conductive layer can realize the detection of array-type sensing data. The fiber monofilaments in the monofilament spacer layer serve as a support body, endowing the warp-knitted spacer sensing fabric with excellent pressure-bearing and impact resistance, so that it has a large strain range when being pressed, which is beneficial to improving the signal resolution of the pressure sensor. The warp-knitted spacer sensing fabric provided by the present invention has a three-dimensional spatial structure, realizes the integral formation of the electrode layer, the monofilament spacer layer, and the sensing layer, has a simple process, low cost, and is convenient for large-scale production and practical application.

[0026] The present invention provides a method for preparing a warp-knitted spacer sensing fabric. By adopting the mature and highly efficient warp-knitting forming technology, an integrated structural design and forming weaving are carried out on the electrode layer with a flexible fabric and the sensing layer with a flexible fabric to obtain the warp-knitted spacer sensing fabric. In the present invention, the electrode layer and the sensing layer of the warp-knitted spacer sensing fabric are connected by fiber filaments into a sandwich structure, and this sandwich structure is integrally woven, eliminating the composite process between the electrode layer and the sensing layer. Moreover, the present invention does not require the use of methods such as gluing layers or sewing to combine the sensing layer with the textile, and also avoids the environmental pollution caused by the reagents required for the gluing layer. The preparation method provided by the present invention has a simple process and low cost. By means of integral weaving, a multi-site warp-knitted spacer sensing fabric is prepared, eliminating the combination process between multiple sensing points.

[0027] The present invention also provides a pressure sensor based on the warp-knitted spacer sensing fabric, which includes a first warp-knitted spacer sensing fabric and a second warp-knitted spacer sensing fabric arranged in a stacked manner, and the sensing layer in the first warp-knitted spacer sensing fabric is in contact connection with the sensing layer in the second warp-knitted spacer sensing fabric. In the pressure sensor of the present invention, the sensing layer can prevent the two electrode layers from directly contacting and causing a short circuit; the electrode layers placed on the upper and lower surface layers are arranged in a vertical arrangement, and the insulating yarns can separate the conductive yarns to form conductive strips, so that the conductive strips in the electrode layers of the upper and lower warp-knitted spacer sensing fabrics can vertically intersect to form a large number of required sensing points, and a large-area sensing array can be directly formed to achieve array sensing. At the same time, the pattern and size of the electrode layer can be flexibly changed according to application requirements. The pressure sensor provided by the present invention is a piezoresistive sensor based on the warp-knitted spacer sensing fabric, and its working principle is as follows: when the fabric is not under pressure, the spatial structure formed by multiple fiber filaments makes the sensing layer and the electrode layer in a non-contact state, and the measured resistance is infinite; when the fabric is under pressure, the fiber filaments buckle and deform, and the distance between the sensing layer and the electrode layer decreases; when the pressure increases to a certain extent, the sensing layer and the electrode layer come into contact with each other and are gradually pressed together, so the corresponding resistance gradually decreases; the magnitude of the pressure can be calculated through the corresponding relationship between the resistance and the pressure. Moreover, the spatial structure of the pressure sensor endows it with good flexibility, air permeability and moisture permeability, and is suitable for application in flexible wearable devices and smart home appliances. In addition, due to the stable three-dimensional spatial structure of the warp-knitted spacer sensing fabric, the performance of the pressure sensor based on the warp-knitted spacer sensing fabric is stable, and the sensitivity is between 0.5 and 59.9 Pa -1 and the response time is 550 - 600 ms, ensuring the effectiveness of the sensing fabric.

[0028] The present invention also provides a pressure-sensing insole including the above pressure sensor. The pressure-sensing insole has multiple sensing points and can well collect the foot pressure information of the human body.

[0029] The present invention also provides a plantar pressure value acquisition system, including the pressure-sensing foot pad, a signal acquisition device, and an intelligent display terminal. When a user steps on it, the pressure-sensing foot pad deforms under pressure, causing a resistance change in the internal electrode layer and transmitting it to the intelligent display terminal. The plantar pressure value acquisition system of the present invention can analyze the user's foot condition by detecting the pressure distribution on the electrode layer, providing reference data for the human body's morphology and foot problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 Schematic structural diagram of a warp-knitted spacer sensing fabric;

[0032] Figure 2 Schematic structural diagram of a monofilament spacer layer obtained by connecting fiber coils in a V shape;

[0033] Figure 3 Schematic structural diagram of a monofilament spacer layer obtained by connecting fiber coils in an X shape;

[0034] Figure 4 Schematic structural diagram of a monofilament spacer layer obtained by connecting fiber coils in a II shape;

[0035] Figure 5 Schematic structural diagram of a monofilament spacer layer obtained by connecting fiber coils in an IXI shape;

[0036] Figure 6 Schematic structural diagram of a pressure sensor based on a warp-knitted spacer sensing fabric;

[0037] Figure 7 Schematic diagram of the setup method of a sensing performance test system for a pressure sensor;

[0038] Among them, 1 - electrode layer; 2 - monofilament spacer layer; 3 - sensing layer; 1' - electrode layer; 2' - monofilament spacer layer; 3' - sensing layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present invention provides a warp-knitted spacer sensing fabric, including an electrode layer, a monofilament spacer layer, and a sensing layer stacked in sequence; the warp-knitted spacer sensing fabric is an integrally formed structure;

[0040] The electrode layer has a full-through double-comb structure, including a plurality of conductive strips arranged in parallel, with an insulating strip disposed between two adjacent conductive strips; the conductive strips are formed by conductive yarns, and the insulating strips are formed by insulating yarns;

[0041] The monofilament spacer layer is formed by connecting fiber coils to each other, and the fiber coils are formed by fiber monofilaments; the electrode layer and the sensing layer are connected by the fiber coils;

[0042] The sensing layer has a full-through double-comb structure and is obtained by weaving sensing yarns;

[0043] In the present invention, unless otherwise specified, the raw materials used are commercially available products well-known to those skilled in the art or are prepared by methods well-known to those skilled in the art.

[0044] As Figure 1 shown, the warp-knitted spacer sensing fabric of the present invention includes an electrode layer 1, a monofilament spacer layer 2, and a sensing layer 3 which are sequentially stacked.

[0045] The warp-knitted spacer sensing fabric of the present invention includes an electrode layer. In the present invention, the electrode layer has a full-through double-comb structure and is obtained by alternately weaving conductive strips and insulating strips arranged in parallel.

[0046] In the present invention, the conductive strip is formed by conductive yarns; the conductive yarns may include at least one of copper wires, silver-plated yarns, carbon nanotube yarns, and graphene yarns. In the present invention, the fineness of the conductive yarns may be 70D. The present invention may use an insulating matrix as a raw material to prepare the conductive yarns. In the present invention, the insulating matrix may include at least one of polyamide, polyester, and cotton fibers. In a specific embodiment of the present invention, the conductive yarn is a silver-plated yarn; the conductive matrix of the conductive yarn is polyamide 6. In a specific embodiment of the present invention, silver plating treatment is performed on the surface of polyamide 6 to obtain a silver-plated yarn with a fineness of 70D. In the present invention, the silver plating treatment may be carried out in a conventional manner in the art. The present invention may weave the conductive yarns to obtain a conductive strip. In the present invention, the width of each conductive strip may be 5-10 mm, and the distance between two adjacent conductive strips may be 4-10 mm; in a specific embodiment of the invention, the width of each conductive strip is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm; the distance between two adjacent conductive strips is 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. In the present invention, the number of conductive strips in the electrode layer may be 40-60, and the number of conductive yarns in each conductive strip may be 3-6. In a specific embodiment of the present invention, the number of conductive strips in the electrode layer is 40, 50, or 60; the number of conductive yarns in each conductive strip is 3, 4, 5, or 6.

[0047] In the present invention, the insulating strip is formed by insulating yarns; the insulating yarns may include at least one of polyamide yarns, polyester yarns, and cotton fibers. In the present invention, the fineness of the insulating yarns may be 100D. In a specific embodiment of the present invention, the insulating yarn is polyester. The present invention may weave the insulating yarns to obtain an insulating strip. In the present invention, the width of each insulating strip may be 4-10 mm, and the distance between two adjacent insulating strips may be 5-10 mm; in a specific embodiment of the invention, the width of each insulating strip is 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm; the distance between two adjacent insulating strips is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. In the present invention, the number of insulating strips in the electrode layer may be 40-60, and the number of insulating yarns in each insulating strip may be 3-6. In a specific embodiment of the present invention, the number of insulating strips in the electrode layer is 40, 50, or 60; the number of insulating yarns in each insulating strip is 3, 4, 5, or 6.

[0048] After obtaining the conductive strips and insulating strips, the present invention alternately weaves the parallel conductive strips and insulating strips to obtain an electrode layer. In the present invention, the electrode layer can withstand an ironing temperature of 80 °C and can withstand 80 washes. In the present invention, the presence of the conductive yarn can achieve the detection of array-type sensing data, and the function of the insulating yarn is to separate the conductive yarns to form conductive strips. Thus, the prepared electrode layer can have better detection sensitivity.

[0049] The warp-knitted spacer sensing fabric of the present invention includes a monofilament spacer layer. In the present invention, the monofilament spacer layer is formed by connecting fiber coils to each other, and the fiber coils are formed by fiber filaments; the fiber coils connect the electrode layer and the sensing layer. In the present invention, the thickness of the monofilament spacer layer can be 2 to 10 mm; in specific embodiments of the present invention, the thickness of the monofilament spacer layer is 2 mm, 4 mm, 6 mm, 8 mm or 10 mm. In the present invention, the fiber filaments can include at least one of polyamide monofilaments, polyester monofilaments and polytrimethylene terephthalate (PTT) fiber filaments; in specific embodiments of the present invention, the fiber filaments are polyamide monofilaments, polyester monofilaments or polytrimethylene terephthalate fiber filaments. In the present invention, the fineness of the fiber filaments can be 30 to 50 tex; in specific embodiments of the present invention, the fineness of the fiber filaments is 30 tex, 40 tex or 50 tex. In the present invention, the connection mode of the fiber coils can include V-shaped, cross (X)-shaped, parallel (II)-shaped or parallel cross (IXI)-shaped, as specifically shown in Figures 2 to 5 shown. In the present invention, the fiber filaments in the monofilament spacer layer serve as a support, endowing the warp-knitted spacer sensing fabric with excellent pressure resistance and impact resistance, so that it has a large strain range when compressed, which is beneficial to improving the signal resolution of the warp-knitted spacer sensing fabric.

[0050] The warp-knitted spacer sensing fabric described in the present invention includes a sensing layer. In the present invention, the sensing layer has a full-lapping double-comb structure and is woven from sensing yarns. In the present invention, the sensing yarns may include carbon black yarns; the breaking strength of the carbon black yarns may be 4.0 - 6.0 cN / dtex, and the breaking elongation may be 25 - 50%. In specific embodiments of the present invention, the breaking strength of the carbon black yarns is 4 cN / dtex, 4.5 cN / dtex, 5 cN / dtex, 5.2 cN / dtex, 5.4 cN / dtex, or 5.6 cN / dtex; the breaking elongation may be 45%, 50%, 55%, or 60%. The carbon black yarns described in the present invention may be woven from polyester black filaments and carbon black conductive filaments. In the present invention, the fineness of the polyester black filaments may be 75D, and the fineness of the carbon black conductive filaments may be 20D. In the present invention, the polyester black filaments and the carbon black conductive filaments may be twisted and shaped in sequence to obtain the carbon black yarns. In the present invention, the temperature of the shaping may be 100 - 120 °C, and the time does not exceed 10 min; in specific embodiments of the present invention, the temperature of the shaping is 100 °C, 110 °C, or 120 °C; the time is 6 min, 8 min, or 10 min. In the present invention, the fabric structure of the sensing layer is a double-jersey structure. In the present invention, the sensing layer can prevent the two electrode layers in the pressure sensor based on the warp-knitted spacer sensing fabric from directly contacting and causing a short circuit.

[0051] In the present invention, the electrode layer and the sensing layer of the warp-knitted spacer sensing fabric are connected by fiber monofilaments to form a sandwich structure. This sandwich structure is integrally woven, eliminating the composite process between the electrode layer and the sensing layer; moreover, the warp-knitted spacer sensing fabric has a stable three-dimensional spatial structure, good air permeability and moisture permeability, and is suitable for application in flexible wearable devices and smart home appliances.

[0052] The present invention also provides a preparation method for the warp-knitted spacer sensing fabric described in the above technical solution, including the following steps:

[0053] Weave a pressure sensor based on the warp-knitted spacer sensing fabric on a double-needle bed warp knitting machine with at least six guide bars:

[0054] On the first two guide bars, alternately thread the conductive yarns and insulating yarns to obtain an electrode layer with a full-lapping double-comb structure; the electrode layer includes alternately arranged conductive strips and insulating strips, and the conductive strips and insulating strips are parallel to each other;

[0055] On the last two guide bars, weave the sensing yarns to obtain a sensing layer with a full-lapping double-comb structure;

[0056] Full-thread the fiber monofilaments on the middle two guide bars, and alternately lay the yarns and form loops on the front and back needle beds to connect the electrode layer and the sensing layer to obtain the warp-knitted spacer sensing fabric.

[0057] In a specific embodiment of the present invention, the double needle bed warp knitting machine is a double needle bed Raschel warp knitting machine.

[0058] The present invention does not require the use of methods such as gluing layers or sewing to combine the sensing layer with the textile, avoiding the environmental pollution caused by the reagents required for the gluing layer and making the manufacturing of the pressure sensor simpler and more convenient. Therefore, the preparation method provided by the present invention has a simple process and low cost, and a multi-site sensor is prepared by an integrated weaving method, eliminating the combination process between multiple sensing points.

[0059] The present invention also provides a pressure sensor based on a warp knitted spacer sensing fabric, including a first warp knitted spacer sensing fabric and a second warp knitted spacer sensing fabric arranged in a stacked manner. The first warp knitted spacer sensing fabric and the second warp knitted spacer sensing fabric are independently the warp knitted spacer sensing fabric described in the above technical solution or the warp knitted spacer sensing fabric obtained by the preparation method described in the above technical solution; the sensing layer in the first warp knitted spacer sensing fabric is in contact connection with the sensing layer in the second warp knitted spacer sensing fabric. In the present invention, the direction of the conductive strips in the electrode layer of the first warp knitted spacer sensing fabric may be perpendicular to the direction of the conductive strips in the electrode layer of the second warp knitted spacer sensing fabric.

[0060] As Figure 6 shown, in a specific embodiment of the present invention, completely identical first warp knitted spacer sensing fabric and second warp knitted spacer sensing fabric are stacked and combined to obtain a pressure sensor based on a warp knitted spacer sensing fabric; the first warp knitted spacer sensing fabric includes an electrode layer 1, a monofilament spacer layer 2, and a sensing layer 3, and the second warp knitted spacer sensing fabric includes an electrode layer 1', a monofilament spacer layer 2', and a sensing layer 3'. In the present invention, specifically, the electrode layer 1 of the first warp knitted spacer sensing fabric and the electrode layer 1' of the second warp knitted spacer sensing fabric are respectively placed on the topmost layer and the bottommost layer, and at the same time, the direction of the conductive strips in the electrode layer 1 and the direction of the conductive strips in the electrode layer 1' are arranged perpendicular to each other, in a 90° configuration; the sensing layer 3 of the first warp knitted spacer sensing fabric and the sensing layer 3' of the second warp knitted spacer sensing fabric are both placed in the inner layer, and the sensing layer 3 and the sensing layer 3' are adjacent and in contact with each other. In the present invention, any one conductive strip in the electrode layer 1 forms a specific intersection point with any one conductive strip in the electrode layer 1', and a transmission loop can be formed through an external circuit to obtain a sensing signal; in the present invention, all the conductive electrode fabric strips in the electrode layer 1 and the electrode layer 1' are connected through a circuit to form an array-type fabric-based pressure sensor; when pressure is applied, the conductive loop at the compressed sensing point shows a resistance change, and then the magnitude of the pressure can be obtained through the relationship between the pressure change and the resistance change.

[0061] In the pressure sensor based on warp-knitted spacer sensing fabric according to the present invention, the electrode layers are located on the upper and lower surface layers, and their patterns and sizes can be flexibly changed according to application requirements; moreover, the electrode layers on the upper and lower surface layers are arranged vertically, and a large-area sensing array can be directly formed. The present invention realizes the integrated forming of the electrode layer, the monofilament spacer layer and the sensing layer, with simple process, low cost, and is convenient for large-scale production and practical application.

[0062] The present invention also provides an application of the pressure sensor based on warp-knitted spacer sensing fabric described in the above technical solution in a flexible wearable device or a smart home appliance. In the present invention, the flexible wearable device may include knee pads, wrist guards, gloves or socks; the smart home appliances include foot pads, mattresses, seat backs or seat cushions.

[0063] The present invention also provides a pressure-sensing foot pad, including the pressure sensor based on warp-knitted spacer sensing fabric described in the above technical solution.

[0064] In the present invention, the pressure-sensing foot pad has a plurality of sensing points, and can well collect the foot pressure information of the human body.

[0065] The present invention also provides a plantar pressure value acquisition system, including a signal acquisition device, a smart display terminal and the pressure-sensing foot pad described in the above technical solution; the pressure-sensing foot pad is connected to the signal acquisition device, and the signal acquisition device is connected to the smart display terminal. In the plantar pressure value acquisition system of the present invention, the pressure layer of the pressure-sensing foot pad is connected to the signal acquisition device.

[0066] The working principle of the plantar pressure value acquisition system of the present invention is as follows: when the user steps on it, the pressure-sensing foot pad deforms under pressure, so that the electrode layer inside it changes in resistance and is transmitted to the smart display terminal. The plantar pressure value acquisition system of the present invention can analyze the user's foot condition by detecting the pressure distribution on the electrode layer, and provide reference data for the human body shape and foot problems.

[0067] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0068] Embodiment 1

[0069] The warp-knitted spacer sensing fabric is woven on a double-needle bed Raschel warp knitting machine with six guide bars, and the six guide bars are numbered as guide bar No. 1, guide bar No. 2, guide bar No. 3, guide bar No. 4, guide bar No. 5 and guide bar No. 6 in sequence from front to back.

[0070] Silver-plated yarn with a fineness of 70D; on guide bar No. 1 and guide bar No. 2, the silver-plated yarn and polyester yarn with a fineness of 100D are alternately threaded; after weaving is completed, an electrode layer is obtained; the electrode layer includes alternately and parallel arranged conductive strips and insulating strips, and has a full-threaded double tricot structure. Among them, the electrode layer includes 60 conductive strips, and each conductive strip includes 5 conductive yarns; the electrode layer includes 60 insulating strips, and each insulating strip includes 5 insulating yarns.

[0071] The polyester black silk with a fineness of 75D and the carbon black conductive wire with a fineness of 20D are twisted, and after that, the obtained material is treated at 120°C for 10 minutes to be shaped, and a carbon black yarn is obtained (the breaking strength of the carbon black yarn is 4.5 cN / dtex, and the breaking elongation is 50%); on guide bar No. 5 and guide bar No. 6, the carbon black yarn is fully threaded to obtain a sensing layer, and the sensing layer has a full-threaded double tricot structure.

[0072] The polyester monofilament with a fineness of 40 tex is fully threaded on guide bar No. 3 and guide bar No. 4, and the yarn is alternately fed and looped on the front and back needle beds to form a monofilament spacer layer that can connect the electrode layer and the sensing layer, and a warp-knitted spacer sensing fabric is obtained.

[0073] The structural schematic diagram of the warp-knitted spacer sensing fabric is as Figure 1 shown, where 1 is the electrode layer, 2 is the monofilament spacer layer, and 3 is the sensing layer.

[0074] Example 2

[0075] The warp-knitted spacer sensing fabric obtained in Example 1 is cut to obtain two warp-knitted spacer sensing fabrics with a size of 10 cm × 10 cm. The two warp-knitted spacer sensing fabrics are laminated so that the sensing layers of the two warp-knitted spacer sensing fabrics are adjacent to and in contact with each other, the electrode layers are respectively located at the topmost layer and the bottommost layer, and the electrode strips in the two warp-knitted spacer sensing fabrics are perpendicular to each other, and a pressure sensor based on the warp-knitted spacer sensing fabric is obtained.

[0076] Test Example 1

[0077] The sensing performance of the pressure sensor based on the warp-knitted spacer sensing fabric obtained in Example 2 is tested, and the specific steps and results are as follows:

[0078] As Figure 7As shown, copper patches are used to attach wires to the electrode layers of the two warp knitted interval sensing fabrics of the pressure sensor obtained in Example 2, a parameter analyzer is connected to the warp knitted interval sensing fabric to form a sensing circuit, a press is used to apply pressure to the pressure sensor based on the warp knitted interval sensing fabric obtained in Example 2, and a parameter analyzer is used to test the resistance change of the warp knitted interval sensing fabric when it is under pressure.

[0079] The results show that when the pressure is between 0 and 30 kPa, the warp knitted interval sensing fabric has good sensitivity; when the pressure is between 0.5 and 59.9 Pa -1 When the pressure is within the normal range (the pressure generated by the limbs during human activities), the warp knitted interval sensing fabric has a good linear relationship, where R 2 =0.928. When a press machine is used to apply regular pressure to the warp knitted interval sensor fabric, the warp knitted interval sensor fabric presents a regular resistance change rate. When a press machine is used to apply pressure at a speed of 300 μm / s, the response time of the warp knitted interval sensor fabric is 582ms, which has a good response time.

[0080] Example 3

[0081] A warp knitted spacer sensing fabric is prepared in the manner of Example 1, and is cut into two pieces of warp knitted spacer sensing fabric with an electrode array of 40×40. The sensing layers of the two pieces of warp knitted spacer sensing fabric are adjacent and in contact with each other, the electrode layers are respectively located at the top layer and the bottom layer, and the electrode strips in the two pieces of warp knitted spacer sensing fabric are made perpendicular to each other, so as to obtain a pressure sensor based on the warp knitted spacer sensing fabric.

[0082] The electrode layer of the pressure sensor based on the warp-knitted interval sensing fabric is connected to a signal acquisition device through a wire, and the signal acquisition device is connected to an intelligent display terminal through a wire, so as to obtain a plantar pressure value acquisition system.

[0083] Test Example 2

[0084] The performance test of the plantar pressure value acquisition system obtained in Example 3 is performed as follows:

[0085] When a person stands on the warp-knitted interval sensing fabric connected to the plantar pressure value acquisition system, the intelligent display terminal can display the corresponding plantar morphology. When different movements are made, the plantar pressure changes, causing the plantar mapping morphology to change, which can be displayed and observed on the intelligent display terminal.

[0086] Combined with the result analysis, it can be seen that the pressure sensor based on the warp-knitted spacer sensing fabric described in Embodiment 3 is formed by the vertical overlap of two warp-knitted spacer sensing fabrics to form a complete sensing system. The upper-layer electrodes and the lower-layer electrodes cross to form a matrix arrangement, and a total of 1600 sensing points are included, which can well collect the foot pressure information of the human body.

[0087] Although the above embodiments have made a detailed description of the present invention, they are only a part of the embodiments of the present invention, rather than all embodiments. People can also obtain other embodiments based on this embodiment without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A warp knitted interval sensor fabric, characterized in that: It comprises an electrode layer, a monofilament spacer layer and a sensor layer which are stacked in sequence, and the warp-knitted spacer sensor fabric is an integrally formed structure; The electrode layer has a full-through double-comb structure, including a plurality of conductive strips arranged in parallel, and an insulating strip is arranged between two adjacent conductive strips; the conductive strips are formed by conductive yarns, and the insulating strips are formed by insulating yarns; The monofilament spacer layer is formed by interconnecting fiber coils, and the fiber coils are formed by fiber monofilaments; the electrode layer and the sensing layer are connected by the fiber coils; The sensing layer has a full-thread double-comb structure and is woven from sensing yarns.

2. The warp knitted spacer sensor fabric according to claim 1, characterized in that: The conductive yarn includes at least one of copper wire, silver-plated yarn, carbon nanotube yarn and graphene yarn; the width of each conductive strip is 5 to 10 mm, and the distance between two adjacent conductive strips is 4 to 10 mm; The insulating yarn comprises at least one of nylon yarn, polyester yarn and cotton fiber; the width of each insulating strip is 4 to 10 mm, and the distance between two adjacent insulating strips is 5 to 10 mm; The fabric structure of the electrode layer is a double-warp plain weave or a double-warp pile weave.

3. The warp knitted spacer sensor fabric according to claim 1, characterized in that: The fiber monofilaments include at least one of nylon monofilaments, polyester monofilaments and polytrimethylene terephthalate fiber monofilaments; the connection modes of the fiber coils include V-shape, cross shape, parallel shape or parallel cross shape.

4. The warp knitted spacer sensor fabric according to claim 1, characterized in that: The sensing yarn comprises carbon black yarn; the breaking strength of the carbon black yarn is 4.0-6.0 cN / dtex, and the breaking elongation is 25-50%; the carbon black yarn is woven from polyester black yarn and carbon black conductive yarn; the fabric structure of the sensing layer is double warp plain weave.

5. The method for preparing the warp knitted interval sensor fabric according to any one of claims 1 to 4, characterized in that: The following steps are involved: Weaving of warp knitted spacer sensor fabrics on a double needle bar warp knitting machine with at least six guide bars: On the first two combs, conductive yarns and insulating yarns are alternately threaded to obtain an electrode layer with a fully threaded double comb structure; the electrode layer includes conductive strips and insulating strips arranged alternately, and the conductive strips and insulating strips are parallel to each other; On the last two comb bars, the sensing yarn is woven to obtain a sensing layer with a full-threaded double comb structure; The fiber monofilaments are fully threaded on the two middle combing bars, the yarns are alternately padded on the front and rear needle beds to form loops, and the electrode layer and the sensor layer are connected to obtain the warp-knitted interval sensor fabric.

6. A pressure sensor based on warp knitted interval sensing fabric, characterized in that: The invention comprises a first warp knitted spacer sensing fabric and a second warp knitted spacer sensing fabric which are stacked, wherein the first warp knitted spacer sensing fabric and the second warp knitted spacer sensing fabric are independently the warp knitted spacer sensing fabric according to any one of claims 1 to 4 or the warp knitted spacer sensing fabric obtained by the preparation method according to claim 5, and the sensing layer in the first warp knitted spacer sensing fabric is in contact with and connected to the sensing layer in the second warp knitted spacer sensing fabric.

7. The pressure sensor based on the warp knitted spacer sensing fabric according to claim 6 is characterized in that: The direction of the conductive strips in the electrode layer of the first warp-knitted spacer sensing fabric is perpendicular to the direction of the conductive strips in the electrode layer of the second warp-knitted spacer sensing fabric.

8. Application of the pressure sensor based on the warp-knitted interval sensing fabric as described in any one of claims 6 to 7 in a flexible wearable device or smart home appliance.

9. A pressure sensing foot pad, characterized in that: A pressure sensor based on warp-knitted interval sensing fabric comprising any one of claims 6 to 7.

10. A system for obtaining plantar pressure values, characterized in that: It comprises a signal acquisition device, an intelligent display terminal and the pressure sensing foot pad according to claim 9; the pressure sensing foot pad is connected to the signal acquisition device, and the signal acquisition device is connected to the intelligent display terminal.

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