Wide-threshold uniform pressure calibration device for flexible fabric pressure sensor

Abstract

The invention relates to the technical field of pressure sensors, and discloses a wide-threshold uniform pressure calibration device for a flexible fabric pressure sensor, which solves the problem that at present, it is difficult to ensure that the pressure uniformly covers the surface of the whole sensor, so that a large error of a calibration result is easily caused, the device comprises a base, and the top of the base is provided with an extrusion mechanism; a clamping mechanism is arranged on the base, a limiting mechanism is arranged on the clamping mechanism, the extrusion mechanism comprises a top disc located over the base, a plurality of supporting columns are fixedly connected between the top disc and the base at equal angles, a mounting disc is fixedly connected to the bottom of the top disc, a rubber air bag is fixedly connected to the bottom of the mounting disc, and a bottom disc is fixedly connected to the bottom of the rubber air bag; according to the invention, through the cooperation of the chassis, the connecting column, the guide ring, the supporting column and the ball, the rubber plate can be guided to uniformly extrude the pressure sensor, so that it is convenient to ensure that the pressure uniformly covers the surface of the whole sensor.

Description

Technical Field

[0001] This invention belongs to the field of pressure sensor technology, specifically a wide threshold uniform pressure calibration device for a flexible fabric pressure sensor. Background Technology

[0002] Flexible fabric pressure sensors are a new type of device that combines electronic sensing functionality with traditional textile materials. Using fabric as a substrate, conductive fibers and nanomaterials are embedded in the fabric, or functional coatings are applied to its surface. Textile processes such as weaving, embroidery, and printing are used to give the fabric the ability to sense pressure. Its working mechanism is mainly based on resistive, capacitive, or piezoelectric principles. When external pressure is applied to the sensor, it causes changes in the contact resistance between conductive materials, changes in capacitance, or the generation of a piezoelectric effect, thereby converting the pressure signal into a measurable electrical signal output. With the lightweight, breathable, soft, and stretchable properties of the fabric itself, this type of sensor shows great application potential in wearable devices, human-computer interaction, medical rehabilitation, and other fields.

[0003] However, existing flexible fabric pressure sensors require calibration of pressure points. For high-density flexible sensors, from a calibration perspective, it is difficult to ensure that the pressure is evenly covered across the entire sensor surface when applying pressure uniformly to each pressure point. This results in significant errors in the calibration results and cannot provide reliable assurance for accurate measurement in practical applications. Therefore, a calibration device suitable for flexible high-density pressure sensors is needed. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a wide threshold uniform pressure calibration device for flexible fabric pressure sensors, which effectively solves the problem that it is difficult to ensure that the pressure uniformly covers the entire sensor surface, which easily leads to large errors in the calibration results.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a flexible fabric pressure sensor with wide threshold uniform pressure calibration device, comprising a base, a squeezing mechanism on the top of the base, a clamping mechanism on the base, and a limiting mechanism on the clamping mechanism; The extrusion mechanism includes a top plate located directly above the base. Multiple support columns are fixedly connected to the top plate and the base at equal angles. A mounting plate is fixedly connected to the bottom of the top plate. A rubber air bladder is fixedly connected to the bottom of the mounting plate. A base plate is fixedly connected to the bottom of the rubber air bladder. A rubber plate is fixedly connected to the bottom of the base plate. An air pipe is fixedly connected to the top of the mounting plate. The end of the air pipe away from the mounting plate extends to the top of the top plate. An inner tube located inside the rubber air bladder is fixedly connected to the bottom of the mounting plate. The inner tube communicates with the air pipe. Multiple through holes are provided on the side and bottom of the inner tube.

[0006] Preferably, a guide ring is movably sleeved on the outer side of the support column, and a connecting column is fixedly connected between the guide ring and the chassis.

[0007] Preferably, the inner side of the guide ring is provided with an annular groove, and a plurality of balls are installed on the inner side of the annular groove, each abutting against the outer wall of the support column.

[0008] Preferably, the clamping mechanism includes a placement plate fixed to the top of the base, the placement plate being located below the rubber plate, an abutment plate fixedly connected to the top of the placement plate, the abutment plate being fixedly sleeved on the outside of one of the support columns, a base block fixedly connected to the bottom of the placement plate, a round rod located below the base being fixedly connected to the outside of the base block, a U-shaped plate being movably sleeved on the outside of the round rod, a top frame fixedly connected to the top of the U-shaped plate, and a clamping plate fixedly connected to the side of the top frame near the abutment plate, the clamping plate being located on the top of the placement plate.

[0009] Preferably, the base has a through groove 1, the bottom block passes through the through groove 1, and two through grooves 2 are symmetrically provided on the base, with the top frame slidably connected to the two through grooves 2.

[0010] Preferably, a screw located below the base is rotatably connected to the outer side of the base block, a handwheel is fixedly connected to the end of the screw away from the base block, a screw sleeve is threaded onto the outer side of the screw, and a U-shaped plate is fixed to the bottom of the screw sleeve.

[0011] Preferably, the limiting mechanism includes a round rod II fixed to the outside of the placement plate, the round rod II passing through a through groove I, a bottom block fixedly sleeved on the middle of the outer side of the round rod II, two sliding plates I symmetrically and movably sleeved on the outer side of the round rod II, a connecting plate fixedly connected to the top of each of the two sliding plates I, a limiting plate fixedly connected to the side of each of the two connecting plates that are close to each other, the two limiting plates being located at the top of the placement plate, two outer rings symmetrically and fixedly sleeved on the outer side of the round rod II, a spring fixedly connected to the side of each of the two outer rings that are close to each other, the ends of the two springs that are close to each other being fixedly connected to the two sliding plates I respectively, and both springs being sleeved on the outer side of the round rod II.

[0012] Preferably, two sliding plates are symmetrically and movably sleeved on the outer side of the round rod two, and the sides of the two sliding plates two that are far apart from each other abut against the two sliding plates one respectively.

[0013] Preferably, the outer side of the U-shaped plate is symmetrically rotatably connected to two movable rods, and the ends of the two movable rods away from the U-shaped plate are respectively rotatably connected to the outer sides of the two sliding plates.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention, through the cooperation between the air tube, mounting plate, rubber air bladder, inner tube and through hole, facilitates the rapid and uniform filling of the internal space of the rubber air bladder with gas, and through the cooperation between the chassis, connecting column, guide ring, support column and ball bearing, guides the rubber plate to uniformly compress the pressure sensor, thereby ensuring that the pressure uniformly covers the entire sensor surface.

[0015] 2. This invention facilitates the fixing of the pressure sensor to the top of the placement plate through the cooperation between the handwheel, screw, screw sleeve, U-shaped plate, round rod one, top frame, through groove two, clamping plate and abutment plate.

[0016] 3. This invention, through the cooperation between the U-shaped plate, the first round rod, the movable rod, the second sliding plate, the second round rod, the first sliding plate, the spring, the outer ring, and the connecting plate, facilitates the two limiting plates to approach each other and clamp the pressure sensor from the front and back, thereby ensuring the stability of the pressure sensor. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the flexible fabric pressure sensor wide threshold uniform pressure calibration device of the present invention. Figure 2 This is a schematic diagram of the base structure of the present invention; Figure 3 This is a schematic diagram of the extrusion mechanism of the present invention; Figure 4 This is a schematic cross-sectional view of the rubber airbag structure of the present invention; Figure 5 This is a schematic diagram of the guide ring structure of the present invention; Figure 6 This is a schematic diagram of the clamping mechanism of the present invention; Figure 7 This is a schematic diagram of the limiting mechanism structure of the present invention; Figure 8 This is a schematic diagram of the circular rod structure of the present invention.

[0019] In the diagram: 1. Base; 2. Extrusion mechanism; 201. Top plate; 202. Air pipe; 203. Rubber airbag; 204. Support column; 205. Chassis; 206. Connecting column; 207. Guide ring; 208. Rubber plate; 209. Mounting plate; 2010. Through hole; 2011. Inner tube; 2012. Ball bearing; 2013. Annular groove; 3. Clamping mechanism; 301. Placement plate; 302. Abutment plate; 303. Round rod one; 304. Base block; 305. Screw; 306. U-shaped plate; 307. Handwheel; 308. Screw sleeve; 309. Top frame; 3010. Clamping plate; 4. Limiting mechanism; 401. Round rod two; 402. Movable rod; 403. Limiting plate; 404. Spring; 405. Outer ring; 406. Slide plate one; 407. Connecting plate; 408. Slide plate two; 5. Through groove one; 6. Through groove two. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Example 1, by Figures 1-8 The present invention relates to a wide threshold uniform pressure calibration device for a flexible fabric pressure sensor, comprising a base 1, a squeezing mechanism 2 on the top of the base 1, a clamping mechanism 3 on the base 1, and a limiting mechanism 4 on the clamping mechanism 3.

[0022] In Embodiment 2, based on Embodiment 1, the extrusion mechanism 2 includes a top plate 201 located directly above the base 1. Multiple support columns 204 are fixedly connected to the top plate 201 and the base 1 at equal angles. A mounting plate 209 is fixedly connected to the bottom of the top plate 201. A rubber air bladder 203 is fixedly connected to the bottom of the mounting plate 209. A base plate 205 is fixedly connected to the bottom of the rubber air bladder 203. A rubber plate 208 is fixedly connected to the bottom of the base plate 205. An air pipe 202 is fixedly connected to the top of the mounting plate 209. One end of the air pipe 202, away from the mounting plate 209, extends above the top plate 201. A positioning... The inner tube 2011 inside the rubber airbag 203 is connected to the air tube 202. The inner tube 2011 has multiple through holes 2010 on its side and bottom. The outer side of the support column 204 is movably fitted with a guide ring 207. The guide ring 207 is fixedly connected to the chassis 205 by a connecting column 206. The inner side of the guide ring 207 is provided with an annular groove 2013. Multiple balls 2012 that abut against the outer wall of the support column 204 are installed on the inner side of the annular groove 2013. By setting the balls 2012, the guide ring 207 is prevented from directly contacting the support column 204, and the friction force on the guide ring 207 when sliding on the outer side of the support column 204 is reduced. First, connect the end of the air tube 202 furthest from the mounting plate 209 to an external booster pump, allowing gas to enter the inner tube 2011 through the air tube 202. Simultaneously, the gas exits from each through hole 2010 and quickly and evenly fills the internal space of the rubber air bladder 203. The rubber air bladder 203 is filled with gas and expands, pushing the chassis 205, thereby moving the rubber plate 208. At the same time, each guide ring 207 slides along each support column 204 through each connecting column 206, achieving limiting and guiding the chassis 205, ensuring the stability of the movement of the rubber plate 208, and ensuring that the rubber plate 208 evenly compresses the pressure sensor, finally ensuring that the pressure evenly covers the entire sensor surface.

[0023] In embodiment three, based on embodiment one, the clamping mechanism 3 includes a placement plate 301 fixed to the top of the base 1. The placement plate 301 is located below the rubber plate 208. An abutment plate 302 is fixedly connected to the top of the placement plate 301. The abutment plate 302 is fixedly sleeved on the outside of one of the support columns 204. A base block 304 is fixedly connected to the bottom of the placement plate 301. A round rod 303 located below the base 1 is fixedly connected to the outside of the base block 304. A U-shaped plate 306 is movably sleeved on the outside of the round rod 303. A top frame 309 is fixedly connected to the top of the U-shaped plate 306. A clamping plate 3010 is fixedly connected to the side of the frame 309 near the abutment plate 302. The clamping plate 3010 is located on the top of the placement plate 301. A through groove 5 is provided on the base 1. The bottom block 304 passes through the through groove 5. Two through grooves 6 are symmetrically provided on the base 1. The top frame 309 is slidably connected to the two through grooves 6. A screw 305 located below the base 1 is rotatably connected to the outer side of the bottom block 304. A handwheel 307 is fixedly connected to the end of the screw 305 away from the bottom block 304. A screw sleeve 308 is threaded onto the outer side of the screw 305. A U-shaped plate 306 is fixed to the bottom of the screw sleeve 308. First, place the pressure sensor on top of the placement plate 301, so that the pressure sensor is below the rubber plate 208 and abuts against the abutment plate 302. Then, rotate the handwheel 307 to drive the screw 305 to rotate. Through the screw sleeve 308, drive the U-shaped plate 306 to slide along the round rod 303, and drive the top frame 309 to slide along the two through slots 6. At the same time, the clamping plate 3010 moves horizontally until it abuts against the pressure sensor, thereby clamping the pressure sensor from both sides. Finally, the pressure sensor is fixed.

[0024] In Example 4, based on Example 1, the limiting mechanism 4 includes a second round rod 401 fixed to the outside of the placement plate 301. The second round rod 401 passes through the through groove 5. The bottom block 304 is fixedly sleeved on the middle of the outer side of the second round rod 401. Two sliding plates 406 are symmetrically and movably sleeved on the outer side of the second round rod 401. A connecting plate 407 is fixedly connected to the top of each of the two sliding plates 406. A limiting plate 403 is fixedly connected to the side of each of the two connecting plates 407 that is close to each other. Both limiting plates 403 are located at the top of the placement plate 301. Two outer rings 40 are symmetrically and fixedly sleeved on the outer side of the second round rod 401. 5. Two outer rings 405 are fixedly connected to each other on their close sides. The close ends of the two springs 404 are fixedly connected to the two slide plates 406 respectively. The two springs 404 are sleeved on the outside of the round rod 401. The outside of the round rod 401 is symmetrically and movably sleeved with two slide plates 408. The far sides of the two slide plates 408 are respectively in contact with the two slide plates 406. The outside of the U-shaped plate 306 is symmetrically and rotatably connected with two movable rods 402. The far ends of the two movable rods 402 are respectively rotatably connected to the outside of the two slide plates 408. In the initial state, the two sliding plates 408, with their sides far apart, abut against the two sliding plates 406, while the two springs 404 are compressed. When the handwheel 307 is rotated, causing the U-shaped plate 306 to slide along the round rod 303, the clamping plate 3010 moves. This, along with the two movable rods 402, causes the two sliding plates 408 to slide along the round rod 401. As the two sliding plates 408 move closer together, they release the restriction effect on the two sliding plates 406. At this point, the two springs 404 return to their original positions, causing the two sliding plates 406 to slide along the round rod 401. Then, the two connecting plates 407 move the two limiting plates 403. When the two limiting plates 403 abut against the pressure sensor, they clamp the pressure sensor from front to back. At this point, the clamping plate 3010 is not in contact with the pressure sensor. The U-shaped plate 306 continues to slide along the round rod 303 until the clamping plate 3010 abuts against the pressure sensor, thus achieving stable clamping of the pressure sensor and ensuring its stability.

Claims

1. A flexible fabric pressure sensor wide threshold uniform pressure calibration device, comprising a base (1), characterized in that: The base (1) is provided with a pressing mechanism (2) at the top, a clamping mechanism (3) on the base (1), and a limiting mechanism (4) on the clamping mechanism (3). The extrusion mechanism (2) includes a top plate (201) located directly above the base (1). Multiple support columns (204) are fixedly connected at equal angles between the top plate (201) and the base (1). A mounting plate (209) is fixedly connected to the bottom of the top plate (201). A rubber air bladder (203) is fixedly connected to the bottom of the mounting plate (209). A base plate (205) is fixedly connected to the bottom of the rubber air bladder (203). A rubber plate (208) is fixedly connected to the bottom of the base plate (205). An air pipe (202) is fixedly connected to the top of the mounting plate (209). One end of the air pipe (202) away from the mounting plate (209) extends to the top of the top plate (201). An inner tube (2011) located inside the rubber air bladder (203) is fixedly connected to the bottom of the mounting plate (209). The inner tube (2011) communicates with the air pipe (202). Multiple through holes (2010) are provided on the side and bottom of the inner tube (2011).

2. The flexible fabric pressure sensor wide threshold uniform pressure calibration device according to claim 1, characterized in that: A guide ring (207) is movably sleeved on the outer side of the support column (204), and a connecting column (206) is fixedly connected between the guide ring (207) and the chassis (205).

3. The flexible fabric pressure sensor wide threshold uniform pressure calibration device according to claim 2, characterized in that: The inner side of the guide ring (207) is provided with an annular groove (2013), and a plurality of balls (2012) are installed on the inner side of the annular groove (2013), which abut against the outer wall of the support column (204).

4. The flexible fabric pressure sensor wide threshold uniform pressure calibration device according to claim 1, characterized in that: The clamping mechanism (3) includes a placement plate (301) fixed to the top of the base (1). The placement plate (301) is located below the rubber plate (208). The top of the placement plate (301) is fixedly connected to an abutment plate (302). The abutment plate (302) is fixedly sleeved on the outside of one of the support columns (204). The bottom of the placement plate (301) is fixedly connected to a base block (304). The outside of the base block (304) is fixedly connected to a round rod (303) located below the base (1). The outside of the round rod (303) is movably sleeved with a U-shaped plate (306). The top of the U-shaped plate (306) is fixedly connected to a top frame (309). The side of the top frame (309) near the abutment plate (302) is fixedly connected to a clamping plate (3010). The clamping plate (3010) is located on the top of the placement plate (301).

5. The flexible fabric pressure sensor wide threshold uniform pressure calibration device according to claim 1, characterized in that: The base (1) has a through slot 1 (5), the bottom block (304) passes through the through slot 1 (5), and two through slots 2 (6) are symmetrically opened on the base (1). The top frame (309) is slidably connected to the two through slots 2 (6).

6. The flexible fabric pressure sensor wide threshold uniform pressure calibration device according to claim 4, characterized in that: The outer side of the base block (304) is rotatably connected to a screw (305) located below the base (1). A handwheel (307) is fixedly connected to one end of the screw (305) away from the base block (304). A screw sleeve (308) is threaded onto the outer side of the screw (305). A U-shaped plate (306) is fixed to the bottom of the screw sleeve (308).

7. The flexible fabric pressure sensor wide threshold uniform pressure calibration device according to claim 1, characterized in that: The limiting mechanism (4) includes a round rod two (401) fixed to the outside of the placement plate (301), the round rod two (401) passes through the through groove one (5), the bottom block (304) is fixedly sleeved on the middle of the outside of the round rod two (401), two sliding plates one (406) are symmetrically and movably sleeved on the outside of the round rod two (401), the top of the two sliding plates one (406) is fixedly connected to the connecting plate (407), the side of the two connecting plates (407) that are close to each other is fixedly connected to the limiting plate (403), the two limiting plates (403) are both located on the top of the placement plate (301), two outer rings (405) are symmetrically and fixedly sleeved on the outside of the round rod two (401), the side of the two outer rings (405) that are close to each other is fixedly connected to the spring (404), the end of the two springs (404) that are close to each other is fixedly connected to the two sliding plates one (406), and the two springs (404) are both sleeved on the outside of the round rod two (401).

8. The flexible fabric pressure sensor wide threshold uniform pressure calibration device according to claim 7, characterized in that: Two sliding plates (408) are symmetrically and movably sleeved on the outer side of the round rod (401). The two sliding plates (408) are respectively abutted against the two sliding plates (406) on the side that is far away from each other.

9. A flexible fabric pressure sensor wide threshold uniform pressure calibration device according to claim 4, characterized in that: Two movable rods (402) are symmetrically rotatably connected to the outer side of the U-shaped plate (306). The ends of the two movable rods (402) away from the U-shaped plate (306) are respectively rotatably connected to the outer side of the two sliding plates (408).

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