Flexible pressure sensor of hydrogel composite membrane
By embedding sensor components in the hydrogel composite film and using conductive sheets and electromagnetic locking mechanisms, the problems of traditional sensors being difficult to conform to curved surfaces and hydrogel sensors being unable to move and position are solved, achieving efficient and accurate pressure sensing effects.
Patent Information
- Application Number
- CN202510817322.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-18
- Publication Date
- 2025-09-09
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing traditional pressure sensors mostly use metal or rigid semiconductor materials, which are difficult to conform to curved surfaces and cannot sense multi-directional forces. In addition, existing hydrogel sensors cannot effectively adapt to the performance of hydrogels, resulting in low sensing efficiency and accuracy, and cannot be moved and positioned according to needs.
It adopts a hydrogel composite membrane with multiple sensor components embedded inside. Each component is connected by a conductive sheet and includes a flexible base, a thermistor, a pressure sensor sheet and a graphene arc sheet. The movement and adjustment of the sensor components are achieved through a press trigger mechanism and a thermal trigger mechanism, and free positioning is achieved using an electromagnetic locking mechanism.
The sensing efficiency and accuracy of the sensor are improved, and the free adjustment and positioning of the sensor components are realized to adapt to the detection needs of different pressure parts.
Smart Images
Figure CN120609468A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of hydrogel composite films, in particular to a flexible pressure sensor of a hydrogel composite film. Background Art
[0002] At present, traditional pressure sensors mostly use metal or rigid semiconductor materials, which have defects such as hard texture, difficulty in conforming to curved surfaces, and inability to sense multi-directional forces, which limit their application in wearable devices and biomedical fields.
[0003] With the development of flexible materials, hydrogels have been widely used in the biomedical field due to their excellent performance. However, existing sensors cannot effectively adapt to the performance of hydrogels, and most sensors are fixed in position and cannot be moved according to demand, and cannot be positioned according to different pressure parts, resulting in low sensing efficiency and accuracy. Therefore, there is an urgent need for a flexible pressure sensor with a hydrogel composite film. Summary of the Invention
[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a flexible pressure sensor of a hydrogel composite film.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A flexible pressure sensor of a hydrogel composite film comprises a hydrogel composite film and a sensor assembly. A plurality of sensor assemblies are embedded and installed inside the hydrogel composite film, and each sensor assembly is connected by a conductive sheet, which is connected to an external power supply. The sensor assembly includes a flexible base, a thermistor, a flexible sheet, and a pressure sensing sheet. A partition is installed on the upper part of the flexible base, and a flexible sheet is installed on the upper part of the partition through a connecting column. The flexible sheet penetrates into an assembly groove provided inside the flexible base and is connected to a plurality of arc-shaped conductive sheets. A graphene arc sheet is provided below each adjacent arc-shaped conductive sheet, and the graphene arc sheet is connected to the thermistor, which is installed on the flexible sheet. A pair of magnetic limiting plates are installed in the middle of the bottom end of the flexible base through an elastic column. The bottom wall of the magnetic limiting plate is made of magnetic material. A blocking plate is provided on the upper part of the magnetic limiting plate. A gap is left between adjacent magnetic limiting plates and a conductive sheet is installed thereon. The conductive sheet passes through the bottom of the blocking plate, and a micro electromagnet is installed below the magnetic limiting plate. The micro electromagnet is electrically connected to any arc-shaped conductive sheet. A pair of micro electromagnets are installed at the bottom of the flexible base, and an elastic column is installed on the top of the micro electromagnets.
[0006] Preferably, the hydrogel composite film comprises a composite film and a hydrogel, and the hydrogel is installed inside the composite film.
[0007] Preferably, a plurality of connecting columns are installed on the bottom of the flexible sheet, and the connecting columns are inserted into the docking holes opened on the upper part of the flexible base and extend to the assembly groove.
[0008] Preferably, an elastic block is installed in the middle of the connecting column, and the elastic block is embedded in the docking hole. When the connecting column moves vertically through the docking hole, the elastic block is squeezed and deformed and generates a rebound force.
[0009] Preferably, a gap is left between the flexible sheet and the flexible base, and a plurality of thermistors are installed on the upper part of the flexible sheet, the first pin of the thermistor is directly exposed to the outside of the flexible sheet and is in direct contact with the hydrogel, the second pin of the thermistor extends downward and penetrates into the assembly groove and is electrically connected to the conductive ring, the conductive ring is limitedly installed on the inner wall of the assembly groove, and one output end of the conductive ring is electrically connected to each graphene arc sheet.
[0010] Preferably, the two sides of the graphene arc sheet are slightly tilted upward, the bottom of the graphene arc sheet is fixedly installed in the assembly groove, and in a natural state, there is a gap between the graphene arc sheet and the arc-shaped conductive sheet. When the arc-shaped conductive sheet moves downward, there is still a gap between the two sides of the graphene arc sheet and the arc-shaped conductive sheet.
[0011] Preferably, protrusions are installed on both sides of the graphene arc sheet, and the protrusions and the snap-in holes opened on both sides of the arc-shaped conductive sheet are snap-in structures to each other. When the arc-shaped conductive sheet is connected to the graphene arc sheet, the arc-shaped conductive sheet and the graphene arc sheet form a connecting conductor, and the protrusions are limitedly snapped into the snap-in holes.
[0012] Preferably, open grooves are provided on both sides of the bottom of the flexible base, and conductive sheets are passed through the open grooves.
[0013] Preferably, a baffle is installed on the upper part of the magnetic limit plate, the baffle cover is installed above the conductive sheet, and a plurality of clamping blocks are installed at the bottom of the baffle, which are engaged with the vertical grooves opened on the outer wall of the conductive sheet.
[0014] Preferably, a micro control unit is installed in the middle of the flexible base, and the micro control unit is electrically connected to each thermistor and micro electromagnet.
[0015] The beneficial effects of the present invention are: In the present invention, a press trigger mechanism and a thermal trigger mechanism are arranged inside the sensor component. When the pressing stroke and the heat reach the corresponding threshold value, the electromagnetic locking mechanism arranged inside the sensor component is released. At this time, the sensor component can be moved and adjusted through the conductive sheet, and the electromagnetic locking mechanism can be stimulated by simply canceling the pressing and the locking function of the sensor component and the conductive sheet can be realized through the card slot card connection structure, thereby realizing the free adjustment positioning function and improving the sensing efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the overall structure of a flexible pressure sensor of a hydrogel composite film proposed in the present invention; Figure 2 Schematic diagram of the external structure of the sensor assembly proposed by the present invention Figure 1 ; Figure 3 Schematic diagram of the external structure of the sensor assembly proposed by the present invention Figure 2 ; Figure 4 This is an exploded schematic diagram of the internal structure of the sensor assembly proposed by the present invention; Figure 5 This is a schematic diagram of the conductive ring structure proposed by the present invention; Figure 6 This is a schematic diagram of the flexible sheet structure proposed by the present invention; Figure 7 Cross-sectional view of the internal structure of the flexible base proposed by the present invention Figure 1 ; Figure 8 Cross-sectional view of the internal structure of the flexible base proposed by the present invention Figure 2 ; Figure 9 This is a schematic diagram of the installation of the connecting column proposed by the present invention; Figure 10 This is a schematic diagram of the installation of the magnetic limiter proposed in the present invention; Figure 11 This is a schematic diagram of the connection structure of the magnetic limiting sheet and the conductive sheet proposed in the present invention; Figure 12 This is an exploded schematic diagram of the magnetic limiter connection structure proposed in the present invention; Figure 13 This is a schematic diagram of the elastic column structure proposed in the present invention.
[0017] In the figure: 1. Hydrogel composite film; 11. Composite film; 12. Hydrogel; 2. Sensor assembly; 21. Flexible base; 211. Docking hole; 22. Thermistor; 221. First pin; 222. Second pin; 23. Flexible sheet; 231. Connecting column; 232. Elastic block; 24. Pressure sensing sheet; 3. Conductive sheet; 31. Vertical groove; 4. Conductive ring; 5. Arc-shaped conductive sheet; 51. Snap-in hole; 6. Graphene arc sheet; 61. Bump; 7. Magnetic limiter; 71. Block; 72. Block; 73. Elastic column; 74. Micro electromagnet; 8. Micro control unit; 9. Assembly slot; 10. Open slot. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0019] Reference Figure 1-13 A flexible pressure sensor of a hydrogel composite film includes a hydrogel composite film 1 and a sensor component 2. A plurality of sensor components 2 are embedded and installed inside the hydrogel composite film 1. Each sensor component 2 is connected by a conductive sheet 3, and the conductive sheet 3 is connected to an external power supply. The sensor assembly 2 includes a flexible base 21, a thermistor 22, a flexible sheet 23, and a pressure sensing sheet 24. A partition is installed on the upper part of the flexible base 21. The flexible sheet 23 is installed on the upper part of the partition through a connecting column 231. The flexible sheet 23 penetrates into the assembly groove 9 provided inside the flexible base 21 and is connected to a plurality of arc-shaped conductive sheets 5. A graphene arc sheet 6 is provided below each adjacent arc-shaped conductive sheet 5. The graphene arc sheet 6 is connected to the thermistor 22, and the thermistor 22 is mounted on the flexible sheet 23. A pair of magnetic limit plates 7 are installed in the middle of the bottom end of the flexible base 21 through elastic columns 73. The bottom wall of the magnetic limit plates 7 is made of magnetic material. A blocking plate 72 is provided on the upper part of the magnetic limit plates 7. A gap is left between adjacent magnetic limit plates 7 and a conductive sheet 3 is clamped and installed. The conductive sheet 3 passes under the blocking plate 72, and a micro electromagnet 74 is installed under the magnetic limit plates 7. The micro electromagnet 74 is electrically connected to any arc-shaped conductive sheet 5. A pair of micro electromagnets 74 are installed at the bottom of the flexible base 21, and an elastic column 73 is installed on the upper part of the micro electromagnet 74. The elastic column 73 includes multiple layers of spacers and Z-shaped sheets. The overall height change operation of the elastic column 73 is achieved by vertical extension of the Z-shaped sheet.
[0020] The hydrogel composite film 1 includes a composite film 11 and a hydrogel 12 , wherein the hydrogel 12 is installed inside the composite film 11 .
[0021] A plurality of connecting columns 231 are installed at the bottom of the flexible sheet 23. The connecting columns 231 are inserted into the docking holes 211 opened on the upper part of the flexible base 21 and extend to the assembly groove 9. After being pressed, the flexible sheet 23 moves toward the side of the flexible base 21 until it conflicts with the flexible base 21, and the connecting columns 231 move downward synchronously.
[0022] An elastic block 232 is installed in the middle of the connecting column 231. The elastic block 232 is embedded in the docking hole 211. When the connecting column 231 moves vertically through the docking hole 211, the elastic block 232 is squeezed and deformed and generates a rebound force. The rebound force generated by the elastic block 232 will drive the connecting column 231 to generate a force in the opposite direction of its movement, thereby realizing its reset function.
[0023] There is a gap between the flexible sheet 23 and the flexible base 21. A plurality of thermistors 22 are installed on the upper part of the flexible sheet 23. The first pin 221 of the thermistor 22 is directly exposed to the outside of the flexible sheet 23 and is in direct contact with the hydrogel 12. The second pin 222 of the thermistor 22 extends downward and penetrates into the assembly groove 9 and is electrically connected to the conductive ring 4. The conductive ring 4 is limitedly installed on the inner wall of the assembly groove 9, and one output end of the conductive ring 4 is electrically connected to each graphene arc sheet 6.
[0024] The two sides of the graphene arc sheet 6 are slightly tilted upward, and the bottom of the graphene arc sheet 6 is fixedly installed in the assembly groove 9. In the natural state, there is a gap between the graphene arc sheet 6 and the arc-shaped conductive sheet 5. When the arc-shaped conductive sheet 5 moves downward, there is still a gap between the two sides of the graphene arc sheet 6 and the arc-shaped conductive sheet 5.
[0025] Bumps 61 are installed on both sides of the graphene arc sheet 6. The bumps 61 and the snap-in holes 51 opened on both sides of the arc-shaped conductive sheet 5 form a snap-in structure with each other. When the arc-shaped conductive sheet 5 and the graphene arc sheet 6 are connected, the arc-shaped conductive sheet 5 and the graphene arc sheet 6 form a connecting conductor, and the bumps 61 are limitedly snapped into the snap-in holes 51.
[0026] Open slots 10 are formed on both sides of the bottom of the flexible base 21 , and conductive sheets 3 are inserted into the open slots 10 .
[0027] A baffle 72 is installed on the upper part of the magnetic limit plate 7, and the baffle 72 is installed above the conductive sheet 3, and a plurality of clamping blocks 71 are installed at the bottom of the baffle 72, which are engaged with the vertical grooves 31 opened on the outer wall of the conductive sheet 3.
[0028] A micro control unit 8 is installed in the middle of the flexible base 21 . The micro control unit 8 is electrically connected to each thermistor 22 and the micro electromagnet 74 .
[0029] In this embodiment, by attaching the hydrogel composite film 1 to the part of the human body to be detected, the material properties of the hydrogel 12 and the composite film 11 can effectively ensure the attachment stability of the hydrogel composite film 1.
[0030] At the same time, the multiple interconnected sensor components 2 arranged in the hydrogel composite film 1 and the pressure sensor sheet 24 arranged at the bottom thereof will detect the pressure of the application position, which is connected to the external control device through a wire to realize signal conversion.
[0031] In actual application, when the pressure sensor 24 needs to be adjusted according to different pressure sensing positions, the operator presses the sensor component 2 at the corresponding position with his finger, so that the temperature on the finger is gradually transferred to the sensor component 2 through the hydrogel 12.
[0032] At this time, the flexible sheet 23 provided in the sensor component 2 is pressed downward, and drives the connecting column 231 connected to it to move outward. The connecting column 231 drives the arc-shaped conductive sheet 5 downward in the flexible base 21 and gradually approaches the graphene arc sheet 6 provided in the flexible base 21. Since there is a certain distance between the flexible base 21 and the flexible sheet 23, this distance is the pressing stroke until the flexible sheet 23 completely conflicts with the flexible base 21 and cannot move.
[0033] At this time, the arc-shaped conductive sheet 5 is in a waiting-to-connect state. When the temperature of the finger is gradually transmitted to the thermistor 22 on the flexible sheet 23 and reaches the trigger threshold of the thermistor 22, the thermistor 22 forms a connected circuit with the first pin 221 exposed in the hydrogel 12 and the second pin 222 installed on the conductive ring 4, and transmits the corresponding electrical signal to the conductive ring 4, and energizes each graphene arc sheet 6 through the conductive ring 4. Since the graphene arc sheet 6 is slightly arc-shaped in its natural state, it deforms due to its material properties after being energized, and continues to bend along its original arc trend until the two sides of the graphene arc sheet 6 are completely raised, and are docked with the snap-in holes 51 opened on the arc-shaped conductive sheet 5 above it through the protrusions 61. At this time, the arc-shaped conductive sheets 5 and the graphene arc sheets 6 are connected to each other and form a connected circuit, and a wire is connected to any arc-shaped conductive sheet 5, and the wires are connected to the micro electromagnet 74 set at the bottom of the flexible base 21.
[0034] When the flexible sheet 23 is subjected to the pressing force and reaches the pressing stroke, and the thermistor 22 reaches the triggering threshold, both triggering conditions are met, causing the micro-electromagnet 74 to be energized, and a repulsive force is generated on the magnetic limit sheet 7 through a specific magnetic field. At this time, the magnetic limit sheet 7 is subjected to the force upward, and the elastic column 73 is stretched, and the clamping block 71 arranged on the upper portion of the magnetic limit sheet 7 is disengaged from the vertical slot 31 opened on the outer side of the conductive sheet 3. At this time, the clamping slot structure is disengaged, and by slightly moving the finger, the sensor assembly 2 can be driven to move along the conductive sheet 3 as a whole through pressure, and then move to the position to be detected. After the adjustment is completed, the connection between the arc-shaped conductive sheet 5 and the graphene arc sheet 6 can be disconnected by releasing the finger, causing the micro-electromagnet 74 to be powered off. Due to the elastic performance of the elastic column 73, the magnetic limit sheet 7 is reset downward, and the conductive sheet 3 is pressed down by the baffle 72, and the clamping is completed by re-entering the vertical slot 31 through the clamping block 71.
[0035] In the natural state, the blocking piece 72 covers the conductive sheet 3 , and the clamping block 71 is engaged with the vertical slot 31 to limit the movement of the sensor assembly 2 .
[0036] Among them, the hydrogel carrier has conductivity.
[0037] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.
Claims
1. A flexible pressure sensor of a hydrogel composite film, comprising a hydrogel composite film and a sensor component, characterized in that: A plurality of sensor components are embedded and installed inside the hydrogel composite membrane, and each sensor component is connected by a conductive sheet, which is connected to an external power supply; The sensor assembly includes a flexible base, a thermistor, a flexible sheet, and a pressure sensing sheet. A partition is installed on the upper part of the flexible base, and a flexible sheet is installed on the upper part of the partition through a connecting column. The flexible sheet penetrates into an assembly groove provided inside the flexible base and is connected to a plurality of arc-shaped conductive sheets. A graphene arc sheet is provided below each adjacent arc-shaped conductive sheet, and the graphene arc sheet is connected to the thermistor, which is installed on the flexible sheet. A pair of magnetic limiting plates are installed in the middle of the bottom end of the flexible base through an elastic column. The bottom wall of the magnetic limiting plate is made of magnetic material. A blocking plate is provided on the upper part of the magnetic limiting plate. A gap is left between adjacent magnetic limiting plates and a conductive sheet is installed thereon. The conductive sheet passes through the bottom of the blocking plate, and a micro electromagnet is installed below the magnetic limiting plate. The micro electromagnet is electrically connected to any arc-shaped conductive sheet. A pair of micro electromagnets are installed at the bottom of the flexible base, an elastic column is installed on the upper part of the micro electromagnet, and a pressure sensing sheet is arranged at the bottom of the flexible base.
2. The flexible pressure sensor of a hydrogel composite film according to claim 1, characterized in that: The hydrogel composite film comprises a composite film and a hydrogel, wherein the hydrogel is arranged inside the composite film.
3. The flexible pressure sensor of a hydrogel composite film according to claim 1, characterized in that: A plurality of connecting columns are installed on the bottom of the flexible sheet. The connecting columns are inserted into the docking holes opened on the upper part of the flexible base and extend to the assembly grooves.
4. The flexible pressure sensor of a hydrogel composite film according to claim 3, characterized in that: An elastic block is installed in the middle of the connecting column. The elastic block is embedded in the docking hole. When the connecting column moves vertically through the docking hole, the elastic block is squeezed and deformed to generate a rebound force.
5. The flexible pressure sensor of a hydrogel composite film according to claim 1, characterized in that: A gap is left between the flexible sheet and the flexible base, and multiple thermistors are installed on the upper part of the flexible sheet. The first pin of the thermistor is directly exposed to the outside of the flexible sheet and is in direct contact with the hydrogel. The second pin of the thermistor extends downward and penetrates into the assembly groove and is electrically connected to the conductive ring. The conductive ring is limitedly installed on the inner wall of the assembly groove, and one output end of the conductive ring is electrically connected to each graphene arc sheet.
6. The flexible pressure sensor of a hydrogel composite film according to claim 5, characterized in that: The two sides of the graphene arc sheet are slightly tilted upward, and the bottom of the graphene arc sheet is fixedly installed in the assembly groove. In the natural state, there is a gap between the graphene arc sheet and the arc-shaped conductive sheet. When the arc-shaped conductive sheet moves downward, there is still a gap between the two sides of the graphene arc sheet and the arc-shaped conductive sheet.
7. The flexible pressure sensor of a hydrogel composite film according to claim 6, characterized in that: Bumps are installed on both sides of the graphene arc sheet, and the bumps and the snap-in holes opened on both sides of the arc-shaped conductive sheet form a snap-in structure with each other. When the arc-shaped conductive sheet is connected to the graphene arc sheet, the arc-shaped conductive sheet and the graphene arc sheet form a connecting conductor, and the bumps are limitedly snapped into the snap-in holes.
8. The flexible pressure sensor of a hydrogel composite film according to claim 1, characterized in that: Open grooves are provided on both sides of the bottom of the flexible base, and conductive sheets are passed through the open grooves.
9. The flexible pressure sensor of a hydrogel composite film according to claim 1, characterized in that: A baffle is installed on the upper part of the magnetic limiting piece, the baffle cover is installed above the conductive sheet, and a plurality of clamping blocks are installed at the bottom of the baffle, which are engaged with the vertical grooves opened on the outer wall of the conductive sheet.
10. The flexible pressure sensor of a hydrogel composite film according to claim 1, characterized in that: A micro control unit is installed in the middle of the flexible base, and the micro control unit is electrically connected to each thermistor and the micro electromagnet.