CN112515326A - Backpack with point-contact-type wearable pressure sensor - Google Patents

Abstract

The invention discloses a backpack provided with a point contact type wearable pressure sensor, which comprises a backpack body, shoulder straps, a circuit assembly and a point contact type wearable pressure sensor, wherein the point contact type wearable pressure sensor is arranged on the backpack body and the outer surface of the shoulder straps, a plurality of detection points are arranged on the shoulder straps and the outer surface of the backpack body, the regional pressure detection can be carried out on the shoulders and the back of a human body, the circuit assembly is fixed at the bottom of the backpack body and is electrically connected with the point contact type wearable pressure sensor, the circuit assembly is also connected with a Bluetooth module and can be connected with mobile terminals such as a mobile phone and a PAD (PAD application program) to display the pressure distribution condition in real time. Through the mode, the point contact type wearable pressure sensor backpack can detect the pressure conditions borne by the shoulders and the back of a human body after the backpack is carried regionally, is shared in real time, and is convenient for timely adjusting the backpack mode according to stress distribution.

Description

Backpack with point-contact-type wearable pressure sensor

Technical Field

The invention relates to a backpack, in particular to a backpack provided with a point contact type wearable pressure sensor.

Background

The backpack is used as a common living article and is applied to various fields of daily life, such as work, school, tourism and the like, the backpack can bear a lot of articles due to large internal space, then, under the condition that too many articles are placed in the backpack, a person is in a state that the stress on the back and the shoulders is uneven for a long time, diseases on the back and the shoulders are easily caused, fatigue, inflammation, injury and the like are caused to the disease, even the spine is deformed and bent, and particularly for children in school, the person can easily get into a bad posture when going to school and getting out of school every day, and the growth and development of the person are extremely unfavorable.

Nowadays, most of the backpacks with pressure detection function in the prior art adopt a common semiconductor piezoelectric impedance diffusion pressure sensor, and the sheet is deformed by external force to generate piezoelectric impedance effect, so that impedance change is converted into electric signals.

Simultaneously, these backpacks are mostly fixed pressure sensor inside the knapsack, and it detects the precision not high, and be not convenient for dismantle and change moreover, and the convenience of use is not strong.

Therefore, it is necessary to design a pressure sensing schoolbag which can detect the stress condition of the shoulder and the back regionally in real time, has high precision and is convenient to detach and replace.

Disclosure of Invention

In order to solve the problems that the existing pressure detection backpack cannot detect the stress condition of the shoulder and the back regionally in real time, has low precision and is inconvenient to disassemble and replace, the invention provides the backpack with the point-contact wearable pressure sensor, which can detect the shoulder and the back regionally when a human body is carried on the backpack, can be shared in real time, has high pressure detection precision and is convenient to disassemble and replace.

In order to achieve the purpose, the invention adopts the technical scheme that:

a backpack provided with a point contact type wearable pressure sensor comprises a backpack body and shoulder straps, and further comprises the point contact type wearable pressure sensor and a circuit assembly, wherein the point contact type wearable pressure sensor is arranged on the backpack body and the outer surfaces of the shoulder straps, and a plurality of detection points are arranged on the shoulder straps and the outer surfaces of the backpack body, so that regional pressure detection can be performed on the shoulders and the back of a human body;

the point-contact wearable pressure sensor comprises a flexible substrate, a first conductive yarn and a second conductive yarn which are distributed in a mutually crossed manner, wherein a dielectric layer is arranged between a first electrode of the first conductive yarn and a second electrode of the second conductive yarn at the crossed point;

the circuit assembly is fixed at the bottom of the backpack body and electrically connected with the point-contact wearable pressure sensor, and the circuit assembly is connected with a Bluetooth module and can be connected to mobile terminals such as a mobile phone and a PAD.

Further, the first conductive yarn and/or the second conductive yarn is/are a core-spun yarn, a covering yarn or a sheath-core fiber; the core layer of the core-spun yarn, the covering yarn or the sheath-core fiber is a first electrode or a second electrode, the sheath layer comprises the dielectric layer, and the resistivity difference of the dielectric layer and the first electrode and the resistivity difference of the dielectric layer and the second electrode are all larger than 0.1 omega-m.

Further, the first conductive yarns and the second conductive yarns are fixed on the surface of the flexible substrate in a crossed mode through embroidery or fixing threads, the first conductive yarns and the second conductive yarns are only distributed on one side of the flexible substrate and are provided with a plurality of cross points, and the point-contact type wearable pressure sensor can acquire position information of each cross point.

Furthermore, the flexible substrate is detachably fixed on the outer surface of the backpack body and the outer surface of the shoulder belt close to the human body.

Further, flexible basement is the centre and is provided with bar open-ended square structure, flexible basement week side is provided with a plurality of pothooks, knapsack body and baldric surface be provided with flexible basement shape complex folding layer, folding layer is to peripheral opening to form the cavity structure, folding layer cavity inside be provided with a plurality of with pothook complex snap ring, be provided with in the middle of the folding layer and place the platform, the two shape is unanimous, place the platform with folding layer formula structure as an organic whole, place the bench surface with folding layer upper surface parallel and level.

Further, the dielectric layer includes an elastic polymer matrix including at least two elastic polymer matrices having different compression moduli and a conductive substance.

Further, the electrode includes, but is not limited to, a metal electrode, an inorganic electrode, an organic electrode, or a composite electrode;

the conductive substance includes, but is not limited to, inorganic, organic or metal conductive substances; the inorganic conductive substance includes but is not limited to one or more of graphite fiber, carbon fiber, silicon fiber and carbon nanotube fiber, and the organic conductive substance includes but is not limited to polyacetylene, polypyrrole, polythiophene, polyaniline, PEDOT: PSS, the metal conductive substance comprises one or more of metal nano particles, metal nano wires/sheets, liquid metal, metal oxide powder and conductive titanium dioxide.

Further, the bottom of the backpack body is provided with a storage box, a rigid cover plate is arranged at the upper end of the storage box, and the circuit component is fixed inside the storage box.

Furthermore, the circuit component comprises a collecting circuit for collecting electric signals at the intersection of the first conductive yarn and the second conductive yarn and a scanning circuit for scanning position signals at the intersection of the first conductive yarn and the second conductive yarn, and the circuit component is further connected with a buzzer and a power supply component fixed inside the storage box.

Further, the outer surface of the point-contact wearable pressure sensor is covered with a sealing film.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the backpack provided with the point contact type wearable pressure sensor, the point contact type pressure sensor is adopted, the pressure sensor is provided with the first conductive yarns and the second conductive yarns which are distributed in a mutually crossed manner, the first electrode, the second electrode and the dielectric layer arranged between the first electrode and the second electrode are arranged at the crossed point of the first conductive yarns and the second conductive yarns, so that a resistance gradient is formed between the two electrodes, when the crossed point is stimulated by pressure, the distance between the two electrodes is changed, the resistance of the electrodes is further changed, and at the moment, the electric signals at the crossed point are collected, so that the detection of pressure sensing can be realized. According to the arrangement, a point-contact wearable pressure sensor can be constructed through the cross points of the yarns, integration on the fabric is facilitated, each cross point can form an independent pressure sensing area, micro-nano sensing can be achieved, and the pressure sensing sensitivity and the pressure response range are remarkably improved.

2. According to the backpack provided with the point contact type wearable pressure sensor, the first conductive yarns and the second conductive yarns of the point contact type wearable pressure sensor are fixed on the same surface of the flexible substrate, the shape of the flexible substrate is set to be in the shape of the Chinese character 'ao', and the shape of the flexible substrate is matched with the shape of shoulder straps on two sides of the backpack and the shape of the backpack body, so that regional pressure detection can be performed on the whole body of the shoulder and the back of a human body, the detection result is more visual, and analysis and comparison of a region with larger pressure are facilitated.

3. According to the backpack provided with the point contact type wearable pressure sensor, the interlayer structure is arranged on the outer surface of the backpack, the periphery of the flexible substrate is embedded into the interlayer and is fixed through the clamping hooks, so that the flexible substrate is flatly arranged on the outermost side of the backpack and is higher than the outermost surface of the backpack, the contact effect of the pressure sensor and a human body is better, the detected data accuracy is higher, and the fixing mode is convenient for detaching the pressure sensor when the schoolbag needs to be cleaned or the backpack is drenched, so that the damage is prevented.

4. According to the backpack provided with the point contact type wearable pressure sensor, the point contact type pressure sensor is arranged, the first conductive yarns and the second conductive yarns which are distributed in a crossed mode are fixed on the surface of the flexible substrate according to the preset patterns by the aid of the fixing yarns, and the first conductive yarns and the second conductive yarns are prepared separately, so that integration and cleaning, disassembly after integration, repair after damage and the like are facilitated.

Drawings

FIG. 1 is a schematic representation of the forward axis of the present invention;

FIG. 2 is a schematic partial isometric view of a folded layer of the present invention;

FIG. 3 is a schematic view of a folded layer of the present invention in a forward direction;

FIG. 4 is an enlarged view of A in FIG. 3;

FIG. 5 is a schematic view of a point contact wearable pressure sensor of the present invention;

FIG. 6 is a schematic view of the bottom end structure of the present invention;

FIG. 7 is a schematic diagram of one configuration of a point contact wearable pressure sensor of the present invention;

FIG. 8 is a graph of data relating to the variation of current with respect to a single pressure point under pressure in accordance with the present invention; b is a graph of relative current change in single compression and extension of the sensing point versus response time; c. d is the running state of the sensing point under 5000 cycles respectively;

FIG. 9 is a schematic view of a structure at the intersection point in the view direction A1-A2 of FIG. 7;

FIG. 10 is a schematic view of an alternative configuration at the intersection point in the view of FIG. 7 from A1-A2;

the parts in the drawings are numbered as follows: 1. a backpack body; 2. shoulder straps; 3. a folding layer; 4. a placing table; 5. a point-contact wearable pressure sensor; 6. a hook; 7. a snap ring; 8. a storage tank; 81. a power supply component; 82. a circuit component; 83. a buzzer; 84. a control component; 85. a rigid cover plate; 10. a first conductive yarn; 11. a first electrode; 12. a first dielectric layer; 20. a second conductive yarn; 21. a second electrode; 22. a second dielectric layer; 30. a dielectric layer; 40. a flexible substrate.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

Example 1

As shown in fig. 1, a backpack provided with a point-contact wearable pressure sensor includes abackpack body 1 andshoulder straps 2, the backpack further includes a point-contactwearable pressure sensor 5 and acircuit component 82, the point-contactwearable pressure sensor 5 is disposed on the outer surfaces of thebackpack body 1 andshoulder straps 2, and can be in closer contact with a human body, and the accuracy of detection data is higher, and a plurality of detection points are disposed on the outer surfaces of theshoulder straps 2 and thebackpack body 1, and are uniformly distributed along theshoulder straps 2 and thebackpack body 1, so that regional pressure detection can be performed on the shoulders and the back of the human body.

As shown in fig. 9 to 10, the point-contactwearable pressure sensor 5 includes aflexible substrate 40, and firstconductive yarns 10 and secondconductive yarns 20 distributed across each other, where theflexible substrate 40 is a fabric or a non-woven fabric, so that the firstconductive yarns 10 and the secondconductive yarns 20 are fixed on the surface of theflexible substrate 40, and adielectric layer 30 is disposed between the first electrodes 11 of the firstconductive yarns 10 and thesecond electrodes 21 of the secondconductive yarns 20 at the crossing points.

Wherein,circuit component 82fixes 1 bottom of knapsack body, and with thewearable pressure sensor 5 electricity of point contact is connected for gather its intersect's signal of telecommunication,circuit component 82 is connected with bluetooth module, thewearable pressure sensor 5 accessible bluetooth module of point contact connects the removal end such as cell-phone and PAD, shares the testing result for the user in real time, is convenient for in time observe the adjustment knapsack mode.

In this embodiment, the firstconductive yarn 10 and/or the secondconductive yarn 20 is a core spun yarn, a covered yarn, or a sheath-core fiber; the core layer of the core spun yarn, the covering yarn or the sheath-core fiber is an electrode, and the sheath layer comprises thedielectric layer 30. For example: the firstconductive yarn 10 is a core-spun yarn, a covering yarn or a sheath-core fiber with a core layer as a first electrode 11 and a sheath layer as afirst dielectric layer 12, and at this time, the secondconductive yarn 20 may be an electrode formed by a common conductive yarn, or a core-spun yarn, a covering yarn or a sheath-core fiber with a core layer as asecond electrode 21 and a sheath layer as asecond dielectric layer 22. The firstconductive yarn 10 and the secondconductive yarn 20 are preferably both core spun yarns or sheath-core fibers with the core layer being an electrode and the sheath layer being adielectric layer 30. When the firstconductive yarn 10 and the secondconductive yarn 20 are skin-core fibers with a core layer as an electrode and a skin layer as adielectric layer 30, a pressure sensor with a smaller scale can be constructed, and pressure sensing with higher precision is realized. The pressure sensing performance can be adjusted by adjusting the thickness of the dielectric.

Wherein the resistivity difference of thedielectric layer 30 and the first andsecond electrodes 11, 21 is larger than 0.1 Ω · m, preferably larger than 100 Ω · m, more preferably larger than 1000 Ω · m, in order to create a resistance gradient between the two electrodes. When the intersection is stimulated by pressure, the distance between the first electrode 11 and thesecond electrode 21 changes, so that the resistance between the two changes, and the pressure sensing detection can be realized by collecting the electric signals at the intersection.

In this embodiment, the firstconductive yarn 10 and the secondconductive yarn 20 are fixed on the surface of theflexible substrate 40 by crossing embroidery or fixing thread, the firstconductive yarn 10 and the secondconductive yarn 20 are distributed on only one side of theflexible substrate 40, and no sewing bending is needed, so that the firstconductive yarn 10 and the secondconductive yarn 20 have better signal transmission effect, wherein the fixed wire is insulated yarn to prevent short circuit, the firstconductive yarn 10 and the secondconductive yarn 20 have several crossing points, the point-contactwearable pressure sensor 5 can acquire the position information of each intersection point through line and column scanning, infrared imaging, equivalent models and the like, and obtaining an integral pressure model according to the electric signals of the cross points, and adjusting the measuring range and the contact area of the pressure sensor by changing the number of the cross points.

In this embodiment, theflexible substrate 40 is detachably fixed on the outer surfaces of thebackpack body 1 and theshoulder straps 2 near the human body, and due to the fact that electronic components such as the pressure sensors are not high in waterproof performance, the point-contact pressure sensors can be conveniently and temporarily removed in time when the backpack needs to be cleaned or in rainy days by adopting a detachable fixing mode, and damage is prevented.

As shown in fig. 2 to 5, the flexible substrate 40 is a square structure with a strip-shaped opening in the middle, because the first conductive yarn 10 and the second conductive yarn 20 are fixed on one side of the flexible substrate 40, the flexible substrate 40 is designed into a shape corresponding to the shoulder strap and the backpack body 1, the flexible substrate 40 can be fixed on the backpack in a matching manner, and the first conductive yarn 10 and the second conductive yarn 20 can be uniformly distributed along the shoulder straps 2 and the backpack body 1 in an integrated manner, the pressure detection area is larger, the stress points are more, a plurality of hooks 6 are arranged on the periphery of the flexible substrate 40, a folding layer 3 matched with the flexible substrate 40 in shape is arranged on the outer surfaces of the backpack body 1 and the shoulder straps 2, the folding layer 3 is opened to the periphery and forms a cavity structure, the periphery of the flexible substrate 40 is matched and pressed in the cavity, a plurality of hooks 7 matched with the hooks 6 are arranged in the cavity of the folding layer 3, pothook 6 with snap ring 7 cooperation is connected, makes flexible basement 40 is flat fixed on 3 surfaces of folded layer, be provided with in the middle of the folded layer 3 and place platform 4, the two shape is unanimous, place platform 4 with 3 one-piece type structures of folded layer, flexible basement 40 is gone up electrically conductive yarn coverage area and is located place on the platform 4, place platform 4 upper surface with 3 upper surface parallel and level of folded layer, make pressure sensor and the more direct contact of human body can be more accurate the collection human shoulder and the regional pressure size that receives of back.

In the present embodiment, thedielectric layer 30 includes an elastic polymer matrix selected from polyurethane, aliphatic-aromatic copolyester, or polyolefin elastomer, and a conductive substance. The compounding mode of the conductive substance and the elastic polymer matrix comprises the following steps: blending and spinning to form composite fibers, blending and spinning to form blended yarns or impregnating or coating conductive substances on the surface of fibers or yarns formed by an elastic polymer matrix. Preferably, the cross section of the fiber and/or yarn is a profiled cross section for expanding the pressure range of the pressure sensing yarn.

The elastic polymer matrix comprises at least two elastic polymer matrixes with different compression moduli, and the pressure sensing yarns can respond in different pressure ranges by compounding the polymers with different compression moduli or constructing profiled fibers, so that the pressure sensing range is enlarged.

In the present embodiment, the electrode includes, but is not limited to, a metal electrode, an inorganic electrode, an organic electrode, or a composite electrode; the conductive substance includes, but is not limited to, inorganic, organic or metal conductive substances; the inorganic conductive substance includes but is not limited to one or more of graphite fiber, carbon fiber, silicon fiber and carbon nanotube fiber, and the organic conductive substance includes but is not limited to polyacetylene, polypyrrole, polythiophene, polyaniline, PEDOT: PSS, the metal conductive substance comprises one or more of metal nano particles, metal nano wires/sheets, liquid metal, metal oxide powder and conductive titanium dioxide.

As shown in fig. 6, thebackpack body 1 is provided with astorage box 8 at the bottom thereof for accommodating the hardware components connected to the pressure sensor, and arigid cover 85 at the upper end of thestorage box 8 for separating the backpack loading object from thestorage box 8 and protecting the internal components of thestorage box 8, wherein thecircuit component 82 is fixed inside thestorage box 8 by an integrated circuit board.

In this embodiment, the circuit assembly 82 includes a collecting circuit for collecting an electrical signal at the intersection of the first conductive yarn 10 and the second conductive yarn 20 and a scanning circuit for scanning a position signal at the intersection of the first conductive yarn 10 and the second conductive yarn 20; the collecting circuit is respectively connected with one end of the first conductive yarn 10 and one end of the second conductive yarn 20, the collecting circuit is also connected with a multi-channel collector, so that when the power supply is switched on, current passes through each row/column at a very fast speed, the multi-channel collector can control the conduction of cross points and record the voltage value of the cross points, and all the cross points can be in a switching-on state by default at any time due to the very fast current speed (close to the light speed); the scanning circuit is connected with a line scanner and a column scanner, and can quickly and accurately acquire the position information of the cross point; the circuit component 82 is also connected with a buzzer 83 and a power supply component 81 fixed in the storage box 8, the buzzer 83 is also connected with a control component 84 connected with the circuit component 82, and when the detected pressure data exceeds a set dangerous value of the backpack, the control component 84 controls the buzzer 83 to give an alarm to remind a user of reducing the weight of the backpack or adjusting the posture in time; the power supply assembly 81 adopts a power battery pack, is convenient to carry and can be continuously used.

In this embodiment, the outer surface of the point-contactwearable pressure sensor 5 is covered with a sealing film, which can isolate dust, liquid, etc., protect the firstconductive yarn 10 and the secondconductive yarn 20, and prolong the service life thereof.

The performance of the point contact pressure sensor is measured in the following with respect to a specific embodiment.

As shown in fig. 7, the firstconductive yarn 10 and the secondconductive yarn 20 are arranged as shown in the figure, the number of crossing points is one, in this embodiment, the firstconductive yarn 10 is a core spun yarn, specifically, the core layer is a plurality of stainless steel wires (as electrodes, resistivity is about 0.55 × 10-6 to 0.65 × 10-6 Ω · m) with denier of 40, the skin layer is a composite yarn of carbon black and polyester, and the core spun by a core-spun machine at 50 twists per 10 cm; the secondconductive yarn 20 is the same type of yarn as the firstconductive yarn 10.

As shown in FIG. 8, the graph a shows the relative current change data of a single pressure point under the pressure state, and it can be seen from the graph a that the relative current change of the sensing point in the interval of 0-15kPa is as high as 2500%, and the curve is relatively smooth and still has obvious change in the interval of 15-50 kPa. Plot b is the relative current change in individual compression and extension of the sensing point with a response time of 0.95s, resulting in a range of typical sensor response times. The pressure sensor provided by the invention has good response sensitivity. The graphs c and d respectively show the operating states of the sensing point under 5000 cycles, and as can be seen from the graphs, the device has excellent operating state, which shows that the device has good cycle stability and long service life, and can detect the stress condition of a person under the backpack state in real time for a long time.

Example 2

Compared withembodiment 1, the backpack provided with the point-contact wearable pressure sensor is different in that the concave-shapedflexible substrate 40 is fixed on thebackpack body 1 and theshoulder straps 2 through fixing yarns at the periphery, or the outer layer of thebackpack body 1 is used as theflexible substrate 40, and the firstconductive yarns 10 and the secondconductive yarns 20 are sequentially fixed on the outer layer of the backpack through fixing yarns or embroidering. The rest is substantially the same as in example 1.

Example 3

The utility model provides a set up wearable pressure sensor's of point contact knapsack, compares withembodiment 1, and the difference lies in, the knapsack has increased the gasbag structure, the gasbag structure includes a plurality of gasbags, breather pipe, can realize bleeding and the miniature air pump of dual-purpose of inflating, the gasbag is fixed in the elasticity gasbag in-band that is provided with a plurality of interval spaces to fix the elasticity gasbag area inside the knapsack, the gasbag position corresponds respectively a plurality of crosspoints ofwearable pressure sensor 5 of point contact, the gasbag passes through the breather pipe and is connected with miniature air pump, and when pressure sensor detected pressure data, the singlechip that sets up inside the knapsack can be according to the pressure size of each crosspoint, and the control air pump is admitted air or is discharged, adjusts the gasbag of each crosspoint department to suitable size for be in the most comfortable state during user's knapsack. The rest is substantially the same as in example 1.

The above description is only for the purpose of illustrating the technical solutions of the present invention and is not intended to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent processes performed by using the contents of the specification and the drawings of the invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A backpack provided with a point-contact wearable pressure sensor comprises a backpack body (1) and shoulder straps (2), and is characterized by further comprising a point-contact wearable pressure sensor (5) and a circuit assembly (82), wherein the point-contact wearable pressure sensor (5) is arranged on the outer surfaces of the backpack body (1) and the shoulder straps (2), and a plurality of detection points for carrying out regional pressure detection on the shoulders and the back of a human body are arranged on the outer surfaces of the shoulder straps (2) and the backpack body (1);

the point-contact wearable pressure sensor (5) comprises a flexible substrate (40), a first conductive yarn (10) and a second conductive yarn (20) which are distributed in a mutually crossed mode, wherein a dielectric layer (30) is arranged between a first electrode (11) of the first conductive yarn (10) and a second electrode (21) of the second conductive yarn (20) at the crossed point;

the circuit component (82) is fixed at the bottom of the backpack body (1) and is electrically connected with the point-contact wearable pressure sensor (5), and the circuit component (82) is connected with a Bluetooth module which realizes signal transmission with a mobile terminal.

2. The backpack of claim 1, wherein the first conductive yarn (10) and/or the second conductive yarn (20) is a core spun yarn, a covered yarn, or a sheath-core fiber; the core layer of the core-spun yarn, the covering yarn or the sheath-core fiber is a first electrode (11) or a second electrode (21), the sheath layer comprises the dielectric layer (30), and the resistivity difference of the dielectric layer (30) and the first electrode (11) and the resistivity difference of the dielectric layer (30) are both larger than 0.1 omega-m.

3. The backpack for arranging the point-contact wearable pressure sensor as claimed in claim 1, wherein the first conductive yarn (10) and the second conductive yarn (20) are fixed on the surface of the flexible substrate (40) by crossing with embroidery or fixed threads, the first conductive yarn (10) and the second conductive yarn (20) are distributed on only one side of the flexible substrate (40) and have a plurality of cross points, and the point-contact wearable pressure sensor (5) can collect the position information of each cross point.

4. The backpack with the wearable pressure sensor of claim 3, wherein the flexible substrate (40) is detachably fixed on the outer surface of the backpack body (1) and the shoulder strap (2) near the human body.

5. The backpack of claim 4 for providing a point-contact wearable pressure sensor, it is characterized in that the flexible substrate (40) is a square structure with a strip-shaped opening in the middle, a plurality of hooks (6) are arranged on the peripheral side of the flexible substrate (40), the outer surfaces of the backpack body (1) and the shoulder straps (2) are provided with folding layers (3) matched with the flexible substrate (40) in shape, the folding layers (3) are opened towards the periphery, and a cavity structure is formed, a plurality of snap rings (7) matched with the snap hooks (6) are arranged in the cavity of the folding layer (3), a placing table (4) is arranged in the middle of the folding layer (3), the shapes of the two are consistent, the placing table (4) and the folding layer (3) are of an integrated structure, and the upper surface of the placing table (4) is flush with the upper surface of the folding layer (3).

6. The backpack of claim 2, wherein the dielectric layer comprises an elastic polymer matrix and a conductive substance, the elastic polymer matrix comprising at least two elastic polymer matrices having different compression moduli.

7. The backpack of claim 2, wherein the electrodes include, but are not limited to, metal, inorganic, organic, or composite electrodes;

the conductive substance includes, but is not limited to, inorganic, organic or metal conductive substances; the inorganic conductive substance includes but is not limited to one or more of graphite fiber, carbon fiber, silicon fiber and carbon nanotube fiber, and the organic conductive substance includes but is not limited to polyacetylene, polypyrrole, polythiophene, polyaniline, PEDOT: PSS, the metal conductive substance comprises one or more of metal nano particles, metal nano wires/sheets, liquid metal, metal oxide powder and conductive titanium dioxide.

8. The backpack for setting a point-contact wearable pressure sensor as claimed in claim 1, wherein the backpack body (1) is provided with a storage box (8) at the bottom, the upper end of the storage box (8) is provided with a rigid cover plate (85), and the circuit assembly (82) is fixed inside the storage box (8).

9. The backpack for setting a point-contact wearable pressure sensor according to claim 8, characterized in that the circuit assembly (82) comprises a collecting circuit for collecting electrical signals at the crossing point of the first conductive yarn (10) and the second conductive yarn (20) and a scanning circuit for scanning position signals at the crossing point of the first conductive yarn (10) and the second conductive yarn (20), and the circuit assembly (82) is further connected with a buzzer (83) and a power supply assembly (81) fixed inside the storage box (8).

10. The backpack for providing a point-contact wearable pressure sensor according to claim 1, characterized in that the outer surface of the point-contact wearable pressure sensor (5) is covered with a sealing film.

Images