Pressure-volume sensing sports insole with 3D printing negative Poisson's ratio structure

Abstract

The utility model discloses a 3D printing negative Poisson's ratio structure pressure-volume sensing sports insole. The 3D printing negative Poisson's ratio structure pressure-volume sensing sports insole comprises a negative Poisson's ratio structure insole insole and a flexible pressure-volume type pressure sensor which are arranged from bottom to top. The insole of the negative Poisson's ratio structure is of a spiral negative Poisson's ratio structure; the flexible pressure-volume type pressure sensor comprises a dielectric interlayer and electrodes arranged at the upper end and the lower end of the dielectric interlayer. According to the utility model, on the basis of the insole with the spiral negative Poisson's ratio structure, the insole is combined with the flexible pressure sensor with high sensing property and high stability, so that the insole has high buffering property and high supporting property, and also has motion monitoring and analysis functions with high sensitivity and stability. The insole provided by the utility model is simple in structure, can be produced and manufactured in a large scale, and is beneficial to industrial production.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flexible pressure sensor, especially to a 3D printing negative poisson's ratio structure's pressure capacity sensing insole. BACKGROUND

[0002] With the development of science and technology and the improvement of human living standards, people's requirements for the comfort, support and shock absorption of insoles are becoming higher and higher, and with the rise of national sports, people's demand for sports monitoring is becoming more and more intense. Therefore, people urgently need an insole product that can have excellent comfort and shock absorption and can monitor and analyze sports.

[0003] In the prior art, for example, application number: 202323230447.1, patent name: a foot pressure monitoring intelligent insole based on warp-knitted spacer fabric, the sensor is introduced into the warp-knitted spacer fabric with negative poisson's ratio structure to prepare the insole. The insole realizes the inconsiderate wearing of the wearer, meets the small and light weight, and can monitor the foot pressure signal in real time. However, the selected area is treated with graphene composite water-based paint in this patent, and the paint is solidified in the loop of the warp-knitted spacer fabric, which affects the rotation and sliding of the loop, and further affects the signal of generating electricity and the feedback to the foot pressure;

[0004] Application number: 202310852260.0, patent name: a pressure sensing insole based on capacitance, inductance and resistance, which realizes comprehensive, real-time and dynamic measurement of foot pressure. However, the threshold level of the oscillator circuit module used in this patent is set by the resistor network, and the maximum frequency is limited by the switching speed of the comparator and the output capacitor load, so the transmission of data during the use of the insole may be affected;

[0005] Application number: 202021029886.X, patent name: an intelligent pressure sensing insole for measuring gait by using a thin film pressure sensor, which is fixedly installed with a pressure module inside the protective pad. The protective pad protects the pressure module. The gait generated by the user during walking is detected through the transmission of the Bluetooth module. The inner arch is arranged on one side of the surface pad, and the air hole pad is arranged inside the bottom pad, which improves the comfort and overall breathability of the insole, and the wear-resistant layer is arranged on one side of the breathable layer, which can prolong the service life of the insole. However, the insole in this patent integrates a battery and a charging device, which may make the insole too heavy and cause the insole to be unable to be used conveniently;

[0006] Patent name: A shoe with negative Poisson's ratio effect, the shoe sole and insole adopt negative Poisson's ratio microstructure design and material selection. It has better energy absorption, shock resistance, ventilation and deformation characteristics than similar products, and has excellent performance such as lightness, ventilation, shock absorption and special working conditions. However, the periodic microstructure of the shoe sole and insole in the patent includes concave structure, rotating polygonal structure, chiral structure and sheet-like wrinkle structure, which makes the structure of the shoe sole and insole too complex and not conducive to large-scale production;

[0007] Patent name: 3D printing negative Poisson's ratio structure shock absorption shoe sole and insole. The corresponding powder is made of high molecular elastomer, the shoe sole model of the shoe sole is drawn by computer 3D modeling software, and the negative Poisson's ratio structure shoe sole and insole drawn by computer are printed by laser sintering 3D printer. It overcomes the problems that traditional model forming technology and subtractive manufacturing technology cannot be realized, and the 3D printed shoe sole and insole have strong impact resistance, excellent elasticity, shear resistance and vibration absorption. However, the artificial synthesis method used to manufacture artificial negative Poisson's ratio material composite cannot be practical, and the strength and hardness of the material are too low. If the hardness and strength of the material are enhanced, the negative Poisson's ratio phenomenon will disappear. Because many auxetic structures are complex, traditional molding technology and subtractive manufacturing technology are difficult to realize, so the development of negative Poisson's ratio structure in industry is limited;

[0008] Patent name: 3D printing negative Poisson's ratio structure shock absorption shoe sole and insole. The corresponding powder is made of high molecular elastomer, the shoe sole model of the shoe sole is drawn by computer 3D modeling software, and the negative Poisson's ratio structure shoe sole and insole drawn by computer are printed by laser sintering 3D printer. It overcomes the problems that traditional model forming technology and subtractive manufacturing technology cannot be realized, and the 3D printed shoe sole and insole have strong impact resistance, excellent elasticity, shear resistance and vibration absorption. However, the artificial synthesis method used to manufacture artificial negative Poisson's ratio material composite cannot be practical, and the strength and hardness of the material are too low. If the hardness and strength of the material are enhanced, the negative Poisson's ratio phenomenon will disappear. Because many auxetic structures are complex, traditional molding technology and subtractive manufacturing technology are difficult to realize, so the development of negative Poisson's ratio structure in industry is limited;

[0009] Based on the above existing technologies, the application of existing negative Poisson's ratio structure insole and pressure sensing insole mainly has the following problems:

[0010] The structure of the insole is too complex, which is not conducive to large-scale production and manufacturing;

[0011] The insole pressure sensor is too heavy or has poor sensing performance, which is difficult to use conveniently or has excellent and stable sensing performance;

[0012] The negative Poisson's ratio structure insole and flexible pressure sensor are not combined well to realize shock absorption, support, lightness and high sensing. Utility model content

[0013] Therefore, in order to solve the problems of poor combination effect and difficult processing of the existing negative Poisson ratio structure insole and sensor, the utility model provides a 3D printing negative Poisson ratio structure pressure and volume sensing sports insole.

[0014] In order to achieve the above object, the utility model adopts the following technical scheme:

[0015] A 3D printing negative Poisson ratio structure pressure and volume sensing sports insole, comprising: negative Poisson ratio structure insole midsole and flexible pressure and volume type pressure sensor arranged from bottom to top.

[0016] The negative Poisson ratio structure insole midsole adopts a spiral negative Poisson ratio structure.

[0017] The flexible pressure and volume type pressure sensor comprises a medium interlayer, electrodes arranged on the upper and lower ends of the medium interlayer.

[0018] As a further improvement of the above technical scheme:

[0019] Preferably, the negative Poisson ratio structure insole midsole is composed of a plurality of unit assemblies, the unit assembly is composed of six structural units spliced into a square body, the structural unit comprises a middle circular unit, four connecting rods arranged on the outer wall of the middle circular unit and arranged vertically in turn, and the adjacent structural units are connected by connecting balls.

[0020] Preferably, the middle circular unit comprises a circular ring, a square frame inscribed in the circular ring, the square frame is composed of two right-angle edges and two V-shaped edges alternately connected, the tips of the two V-shaped edges are both directed to the center of the square frame, and a connecting rod is arranged between the V-shaped edge and the circular ring.

[0021] Preferably, the medium interlayer is formed by a plurality of dielectric microstructures, the dielectric microstructure is composed of a bionic starfish negative Poisson ratio assembly on the left and right sides and a pyramid-like block in the middle.

[0022] Preferably, the bionic starfish negative Poisson ratio assembly comprises fixed blocks on the upper and lower sides and a bionic starfish frame in the middle layer, the four edges of the bionic starfish frame are V-shaped and all directed to the center of the bionic starfish frame.

[0023] Preferably, the flexible pressure and volume type pressure sensor is glued with a sealing gasket on the outside.

[0024] Preferably, the flexible pressure and volume type pressure sensor and the Poisson ratio structure insole midsole are connected in an adhesive manner.

[0025] Compared with the prior art, the utility model has the advantages of

[0026] The utility model discloses a negative poisson's ratio structure insole middle sole based on the negative poisson's ratio structure insole middle sole, and the high sensing, high stability flexible pressure sensor is combined, realizes that the insole middle sole has high buffering, high support and has high sensitivity and stability motion monitoring, analysis function.

[0027] The insole is simple in structure, can realize mass production and is favorable for industrial production.

[0028] The negative poisson's ratio structure insole realizes high damping, high support and is combined with the flexible pressure sensor to improve the lightness, comfort and signal stability of the insole pressure sensing. The 3D printing technology is favorable for the forming of the negative poisson's ratio complex structure, and the printed negative poisson's ratio structure insole can enhance the damping and support effect of the insole to reduce the impact on the ankle and knee during running. The flexible pressure sensor is attached to the negative poisson's ratio structure insole, and the flexible pressure sensor has the characteristics of lightness, high comfort, high sensitivity and high stability, can stably collect and output pressure signals, and can collect, process and analyze the plantar pressure data to provide personalized motion monitoring services for users. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the whole structure schematic diagram of the utility model.

[0030] Figure 2 It is the whole compression structure schematic diagram of the utility model;

[0031] Figure 3 It is the medium interlayer three-dimensional structure schematic diagram of the utility model;

[0032] Figure 4 It is the structure unit three-dimensional structure schematic diagram of the utility model;

[0033] Figure 5 It is the structure unit overhead view structure schematic diagram of the utility model;

[0034] Figure 6 It is the structure unit related size schematic diagram of the utility model;

[0035] In the drawing: 1, negative poisson's ratio structure insole middle sole;11, unit assembly;12, structure unit;121, circular ring;122, square frame;123, connecting rod;124, connecting rod;13, connecting ball;2, flexible pressure container type pressure sensor;21, electrode;22, medium interlayer;221, pyramid block;222, fixed block;223, bionic starfish frame. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0037] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the directions or position relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated or implied to have a specific direction, to be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The technical scheme is shown in the drawings. Figure 1 The technical scheme mainly includes a flexible pressure-capacity pressure sensor 2 and a negative Poisson's ratio structure insole midsole 1 distributed upward and downward.

[0040] 1. As shown in the drawings, Figure 1 , the drawings, Figure 2 and the drawings, Figure 3 , the flexible pressure-capacity pressure sensor 2 part (FSCPS): composed of three layers, the electrodes 21 are distributed in the upper layer and the lower layer, and the medium interlayer 22 is in the middle. Among them, the dielectric layer is a combination of bionic starfish negative Poisson's ratio (NPR) structure and pyramid-shaped microstructure, which improves the sensitivity and reliability of the sensor, and its specific structure is described as follows:

[0041] The medium interlayer 22 is composed of a plurality of dielectric microstructures, and the dielectric microstructure is composed of bionic starfish negative Poisson's ratio components on the left and right sides and a pyramid-shaped block 221 in the middle. The bionic starfish negative Poisson's ratio component includes fixed blocks 222 on the upper and lower sides and a bionic starfish frame 223 in the middle layer, and the four edges of the bionic starfish frame 223 are V-shaped and all face the center of the bionic starfish frame 223.

[0042] The production of the flexible pressure-capacity pressure sensor 2 part is shown as follows:

[0043] Technology selection: 3D printing technology, printing material is PLA material printing mold.

[0044] Material selection: The main material is polydimethylsiloxane (PDMS)

[0045] Preparation of flexible pressure capacitive pressure sensor 2:

[0046] First, use SolidWorks to design the NPR starfish-shaped pyramid microstructure and PDMS (polydimethylsiloxane) base mold.

[0047] The dielectric layer of the bionic starfish NPR pyramid microstructure is shown in Figure 1 .

[0048] Match the PDMS with its corresponding curing agent in a mass ratio of 10:1.

[0049] Pour the prepared mixture into the mold, then place the mold in a vacuum drying oven with an ambient temperature of 55°C for 30 minutes to remove bubbles generated during preparation.

[0050] Prepare the flexible electrode 21, evenly coat the stirred conductive silver paste on one side of the PDMS base, and dry it in a vacuum oven at an ambient temperature of 40°C for 4 hours to ensure that the conductive silver paste is cured, thereby preparing the flexible electrode 21.

[0051] The bionic starfish NPR pyramid microstructure is bonded to the upper and lower electrodes 21 as a dielectric layer through SR (synthetic rubber). A pressure capacitive flexible sensor FSCPS with a bionic starfish NPR pyramid microstructure is prepared through layer-by-layer assembly technology. The 3D structure of the flexible pressure sensor is shown in Figure 3 .

[0052] 2. As shown in Figure 1 , attached Figure 2 , attached Figure 4 and attached Figure 5 , the negative Poisson's ratio structure insole midsole 1 applies a spiral negative Poisson's ratio structure to the design of the running shoe midsole structure, enhancing the cushioning ability of the insole, thereby reducing the impact on the ankle and knee. Its specific structure is as follows:

[0053] The negative Poisson's ratio structure insole midsole 1 is composed of a plurality of unit assemblies 11, and the unit assembly 11 is composed of six structural units 12 spliced into a square body, and the structural unit 12 includes a middle circular unit, four connecting rods 124 arranged tangentially on the outer wall of the middle circular unit and arranged vertically in turn, and the connecting ball 13 connects the corresponding two connecting rods 124 of the adjacent structural units 12.

[0054] The intermediate circular unit comprises a circular ring 121, a square frame 122 is arranged in the circular ring 121, the square frame 122 is composed of two right-angle edges and two V-shaped edges, the tips of the two V-shaped edges are directed to the center of the square frame 122, and a connecting rod 123 is arranged between the concave point of the V-shaped edge and the circular ring 121.

[0055] The manufacturing of the negative Poisson's ratio structure insole 1 is as follows:

[0056] Technical selection: light curing (SLA) printing technology

[0057] Printing material selection: the printing material is selected to have a density of 0.96 g / cm 3 , and a breaking strength of 8.20 MPa.

[0058] 3D printing: the parameters of the insole basic unit are designed by CAD, and a spiral negative Poisson's ratio structure with the most obvious stability of negative Poisson's ratio effect after compression is selected for 3D printing. The parameters of the negative Poisson's ratio structure basic unit are as follows:

[0059] As shown in the accompanying Figure 6 , the circular ring radius r is 1.8 mm, the horizontal cell wall length l1 is 32 mm, the inclined cell wall length l2 is 16, the connecting cell wall length l3 is 16 mm, the cell wall width is 10 mm (the width viewed from top to bottom in the perspective view), the cell wall thickness t is 0.5 mm, and the concave angle θ is 45°. The structure unit 12 is shown in the schematic view. Figure 4 Finally, the light curing (SLA) printing technology is used to print the insole of the sports insole with the chiral NPR structure by using a 3D printer.

[0060] The optimal insole structure parameters are obtained through static compression and dynamic compression simulation tests, and the structure has excellent lateral shrinkage and excellent damping performance, so that the insole has excellent cushioning and shock absorption.

[0061] 3. Negative Poisson's ratio structure insole 1 combined with flexible sensor

[0062] The negative Poisson's ratio structure insole 1 is combined with the prepared flexible pressure sensor FSCPS. The structure schematic diagram after combination is shown in the accompanying Figure 6 . The flexible pressure sensor and the negative Poisson's ratio structure insole are bonded and assembled by using the point gluing technology and the gluing technology with epoxy resin glue or silicone rubber as the bonding material, the sensor is sealed and protected by using a sealing gasket, and the insole is installed by using the adhesive, so that the negative Poisson's ratio pressure-capacity sensing sports insole is formed. The schematic diagrams of the negative Poisson's ratio pressure-capacity sensing insole before and after compression are shown in the accompanying Figure 2 .

[0063] The above merely is the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited to this, any skilled person in the technical field according to the technical scheme and the utility model concept of the present utility model is equivalent to replace or change within the technical range disclosed by the present utility model, and should be covered in the protection scope of the present utility model.

Claims

1. A pressure-insole for 3D printed negative Poisson's ratio structure, characterized in that, The invention relates to a negative Poisson's ratio structure insole (1) and a flexible pressure-capacitive pressure sensor (2). The negative Poisson's ratio structure insole (1) adopts a spiral negative Poisson's ratio structure. The flexible pressure-capacitive pressure sensor (2) comprises a medium interlayer (22) and electrodes (21) arranged on the upper and lower ends of the medium interlayer (22). The negative Poisson's ratio structure insole (1) is composed of a plurality of unit assemblies (11), the unit assembly (11) is composed of six structural units (12) spliced into a square body, the structural unit (12) comprises a middle circular unit, four connecting rods (124) arranged on the outer wall of the middle circular unit in tangential and vertical order, and the connecting rods (124) of adjacent structural units (12) are connected through connecting balls (13).

2. The pressure-insole of claim 1, wherein, The middle circular unit comprises a circular ring (121) and a square frame (122) arranged in the circular ring (121), the square frame (122) is composed of two straight angle edges and two V-shaped edges, the tips of the two V-shaped edges are directed to the center of the square frame (122), and a connecting rod (123) is arranged between the V-shaped edge and the circular ring (121).

3. The pressure-insole of claim 2, wherein, The medium interlayer (22) is composed of a plurality of dielectric microstructures, the dielectric microstructure is composed of a bionic starfish negative Poisson's ratio assembly on the left and right sides and a pyramid-like block (221) in the middle.

4. The pressure-insole of claim 1, wherein, The bionic starfish negative Poisson's ratio assembly comprises fixed blocks (222) on the upper and lower sides and a bionic starfish frame (223) in the middle layer, the four edges of the bionic starfish frame (223) are V-shaped and directed to the center of the bionic starfish frame (223).

5. The pressure-insole of claim 4, wherein, The flexible pressure-capacitive pressure sensor (2) is glued with a sealing gasket on the outside.

6. The pressure-insole of claim 1, wherein, The flexible pressure-capacitive pressure sensor (2) and the Poisson's ratio structure insole are connected in an adhesive manner.

7. The pressure-insole of claim 1, wherein, ​

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