A flexible pressure sensor piezoresistive testing device

Abstract

This utility model discloses a piezoresistive testing device for a flexible pressure sensor, relating to the field of flexible pressure sensor manufacturing technology. The device includes a main body, a pressure head, and a base. Mounting seats are connected to the bottom of the pressure head and the top of the base, and a contact plate is connected to the outer ring of the mounting seat. Limiting bolts penetrate the outer surface of the mounting seat, and a retaining plate is fixed inside the mounting seat. Retaining grooves are provided on the top of the pressure head and the bottom of the base. This utility model, through the arrangement of the mounting seat and the contact plate, allows for the use of different materials for the contact plate, suitable for various application scenarios, such as conventional metal pressure. The edges of the contact plate are chamfered to create a rounded transition, and the contact surface between the contact plate and the flexible sensor is mirror-polished to prevent burrs, wind-induced damage, or other issues that could scratch or puncture the flexible sensor during testing. The mounting seat is detachable, facilitating timely replacement of the contact plate after wear, effectively reducing damage to the flexible sensor.

Description

Technical Field

[0001] This utility model relates to the field of flexible pressure sensor manufacturing technology, specifically a piezoresistive testing device for flexible pressure sensors. Background Technology

[0002] Flexible sensors are sensors made of flexible materials. They have good flexibility, ductility, and can even be bent or folded freely. Moreover, their structures are flexible and diverse, and can be arranged arbitrarily according to the requirements of measurement conditions, making it very convenient to detect complex measurands.

[0003] The advantages of flexible sensors make them highly promising for applications in fields such as medical electronics, environmental monitoring, and wearable devices. For example, in environmental monitoring, scientists have incorporated flexible sensors into devices to monitor the intensity of typhoons and rainstorms. In wearables, flexible electronics make it easier to test skin parameters because the human body is not flat. Using flexible sensors and conductors, scientists can convert external forces or heat into electrical signals, which are then transmitted to a robot's computer for signal processing. This allows for the creation of transparent, flexible, stretchable, bendable, and wearable electronic skin, enabling real-time and accurate monitoring of various human health indicators.

[0004] Existing piezoresistive testing devices for flexible pressure sensors typically apply pressure to the sensor using an indenter to perform the test. However, the indenter is usually made of metal, and after prolonged use, the contact surface between the indenter and the flexible sensor may experience wear. Over time, this wear accumulates, and since the hardness of metal is much higher than that of the flexible pressure sensor, the high hardness combined with the rough surface after wear can easily cause scratches, permanent deformation, or even punctures to the flexible pressure sensor during testing, rendering it unusable. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a flexible pressure sensor piezoresistive testing device to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flexible pressure sensor piezoresistive testing device, comprising a device body, a pressure head and a base, wherein the bottom of the pressure head and the top of the base are connected to mounting seats, and a contact plate is connected to the outer ring of the mounting seats, a limit bolt passes through the outer surface of the mounting seats, a retaining plate is fixed inside the mounting seats, and a retaining groove is provided on the top of the pressure head and the bottom of the base.

[0007] By adopting the above technical solution, during the measurement process, such as conventional metal pressure application (where the contact plate is made of stainless steel or other metal materials), the edges of the contact plate are chamfered to form a rounded transition, and the contact surface between the contact plate and the flexible sensor is mirror-polished to avoid burrs, wind-induced edges, etc., which could cause the flexible sensor to be scratched or punctured during testing. The mounting base is detachable, facilitating timely replacement of the contact plate after wear. Compared to replacing the entire pressure head, this method is less wasteful and requires fewer materials, resulting in lower costs. When it is necessary to replace a worn contact plate or replace it with another type of contact plate, the operator first removes the limit bolts and anti-loosening washers, and then rotates the contact plate or mounting base to rotate the clamping plate. Once the slot opening is larger, the mounting base and contact plate can be removed vertically. During installation, the worker aligns the plate with the larger slot opening, then attaches the mounting base to the pressure head or base. The worker then rotates the mounting base to move the plate to the smaller slot opening, thus limiting the mounting base and preventing it from falling off vertically. This completes the installation of the contact plate. After installing the mounting base, the worker screws in the limiting bolts to prevent the mounting base from rotating due to vibration during reciprocating up and down movements, thus preventing the mounting base from falling off and damaging the flexible pressure sensor. The limiting bolts also have anti-loosening washers to prevent vibration from causing the limiting bolts to loosen and fall off.

[0008] Furthermore, the end face of the touch plate is connected to the outer ring by a rounded transition, and the bottom of the touch plate is smooth and flat.

[0009] By adopting the above technical solution, the contact plate is made of stainless steel or other metal materials. The corners of the contact plate are chamfered to form a rounded transition, and the contact surface between the contact plate and the flexible sensor is mirror polished to avoid burrs, wind-induced corners, etc., which could cause the flexible sensor to be scratched or punctured during testing.

[0010] Furthermore, the contact plate is fixedly connected to the mounting base, and the mounting base is detachably connected to the pressure head and the base.

[0011] By adopting the above technical solution, the mounting base is also made of stainless steel. When combined with the stainless steel contact plate, it can be welded or integrally molded. When combined with materials such as POM, foam, and rubber, the surface can be roughened by grinding and then fixed with a primer and adhesive, such as Loctite 770 primer, silane coupling agent primer, cyanoacrylate adhesive, two-component epoxy resin adhesive, two-component polyurethane adhesive, contact adhesive, room temperature vulcanizing silicone rubber adhesive, high-strength modified silane polymer adhesive, water-based polyurethane adhesive, etc. The mounting base is detachable, which facilitates timely replacement after the contact plate wears out. Compared with replacing the entire pressure head, it is less wasteful and requires less material, resulting in lower costs.

[0012] Furthermore, the longitudinal section of the card plate is L-shaped, and the cross-section of the card slot is L-shaped.

[0013] By adopting the above technical solution, the worker aligns the card plate with the area of ​​the larger card slot opening, then the worker attaches the mounting base to the pressure head or base, and then the worker rotates the mounting base to make the card plate rotate to the area of ​​the smaller card slot opening, thereby limiting the mounting base and preventing the mounting base from falling off vertically.

[0014] Furthermore, the card plate and the card slot are detachably connected.

[0015] By adopting the above technical solution, the operator can rotate the contact plate or mounting base to make the card plate rotate to a larger area of ​​the card slot opening, and then the mounting base and contact plate can be removed vertically.

[0016] Furthermore, an anti-loosening washer is provided on the outside of the limiting bolt.

[0017] By adopting the above technical solution, when it is necessary to replace a worn contact plate or replace it with another type of contact plate, the staff first removes the limit bolt and anti-loosening washer.

[0018] Furthermore, the limiting bolt is threadedly connected to the pressure head and the base, and the limiting bolt abuts against the mounting seat.

[0019] By adopting the above technical solution, the staff screws in the limiting bolts, thereby preventing the mounting base from rotating due to vibration during the reciprocating up and down movement, thus preventing the mounting base from falling off and damaging the flexible pressure sensor. In addition, the limiting bolts have anti-loosening washers, which can prevent the limiting bolts from loosening and falling off due to vibration.

[0020] Furthermore, an electric cylinder is installed on the top of the main body of the device, and the output end of the electric cylinder is connected to a pressure head through a force sensor. A base is connected to the lower part of the main body of the device, and a control cabinet is installed on the upper part of the main body of the device. A display screen and control buttons are installed on the cabinet door on the surface of the control cabinet. Cables are connected to both sides of the bottom of the control cabinet, and one end of each cable is connected to an alligator clip.

[0021] By adopting the above technical solution, the operator places the flexible pressure sensor to be tested on the base, and then connects the cable to the contact terminal of the flexible pressure sensor using alligator clips. At this point, preparation is complete, and the operator can then control the electric cylinder to start via the control cabinet. The advantages of using an electric cylinder are: compared to a hydraulic cylinder, there is no risk of hydraulic oil leakage and contamination; compared to hydraulic and pneumatic cylinders, the structure is simple, without complicated pipelines, valves, pumps, or hydraulic oil or compressed air containers; and the electric cylinder can be precisely controlled via servo control to prevent excessive pressure from causing the flexible pressure sensor to crack or deform. Furthermore, the electric cylinder has good sealing properties, a long service life, and is easy to maintain. After the cylinder starts, the output end drives the measuring force sensor, pressure head, mounting base under the pressure head, contact plate, and other structures to move downward, thereby applying pressure to the flexible pressure sensor. During this process, the measuring force sensor and the force sensor used for measurement perform real-time, high-precision measurement of the force applied to the flexible pressure sensor to avoid excessive pressure and to compare it with the pressure received by the flexible pressure sensor. The flexible pressure sensor converts the received pressure into an electrical signal and sends the electrical signal to the control cabinet through a cable, where the active measurement unit can perform calculations. After the measurement is completed, the output end of the electric cylinder retracts, retracting the measuring force sensor, pressure head, and other structures. At this point, the operator can unload the tested flexible pressure sensor.

[0022] Furthermore, multiple card plates and card slots are provided, and the multiple card plates and card slots are distributed in a double-ring array.

[0023] By adopting the above technical solution and increasing the number of card plates and slots, the connection surface and support points of the structure are increased, thereby improving the stability of the mounting base after installation.

[0024] Furthermore, the touch plate is made of stainless steel, polyurethane foam, silicone rubber, POM or EVA foam materials.

[0025] By adopting the above technical solutions, the contact plate can be made of different materials to suit different application scenarios. For example, hard materials such as stainless steel are suitable for high-precision measurement work. POM material can also be used, which has good pressure resistance and a lower surface friction coefficient than stainless steel, which can further reduce the phenomenon of scratching the flexible pressure sensor. Alternatively, contact plates made of foaming materials such as polyurethane foam and EVA foam, or flexible materials such as rubber and silicone rubber, have a certain degree of cushioning, which can effectively prevent the pressure head from damaging the flexible pressure sensor, isolate the influence of vibration, and simulate the pressure measurement when in contact with skin.

[0026] In summary, the present invention has the following main advantages:

[0027] 1. This utility model, through the setting of a mounting base and a contact plate, allows the contact plate to be made of different materials to suit different application scenarios, such as conventional metal pressure. The corners of the contact plate are chamfered to form a rounded transition, and the contact surface between the contact plate and the flexible sensor is mirror polished to avoid burrs, wind-induced corners, etc., which could cause the flexible sensor to be scratched or punctured during testing. The mounting base is detachable, which facilitates timely replacement of the contact plate after wear. Compared with replacing the entire pressure head, it is less wasteful and requires less material, resulting in lower costs; effectively reducing damage to the flexible sensor.

[0028] 2. This utility model, through the setting of the clamping plate and the clamping slot, allows for easy replacement of the contact plate when disassembling and assembling the mounting base. Simply rotate the contact plate or the mounting base so that the clamping plate rotates to a larger area of ​​the clamping slot opening, and then the mounting base and the contact plate can be removed vertically. During installation, align the clamping plate with a larger area of ​​the clamping slot opening, then attach the mounting base to the pressure head or base, and then rotate the mounting base so that the clamping plate rotates to a smaller area of ​​the clamping slot opening, thereby limiting the mounting base and preventing it from falling off vertically, thus completing the installation of the contact plate; it facilitates quick and easy disassembly and assembly.

[0029] 3. By setting a limiting bolt, this utility model prevents the mounting base from rotating due to vibration during its reciprocating up and down movement after the mounting base is installed. This avoids the mounting base falling off and damaging the flexible pressure sensor. It also improves stability, and the single bolt structure avoids excessively increasing the complexity of operation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the main structure of the device of this utility model;

[0032] Figure 3 This is a side sectional view of the pressure head structure of this utility model;

[0033] Figure 4 This is a schematic diagram of the explosion structure of the pressure head of this utility model;

[0034] Figure 5 This is a schematic diagram of the exploded structure of the base of this utility model.

[0035] In the diagram: 1. Main body of the device; 2. Electric cylinder; 3. Measuring force sensor; 4. Pressure head; 5. Base; 6. Control cabinet; 7. Cable; 8. Mounting seat; 9. Contact plate; 10. Card plate; 11. Card slot; 12. Limit bolt. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The embodiments of this utility model will be described below based on its overall structure.

[0038] Example 1:

[0039] A flexible pressure sensor piezoresistive testing device, such as Figures 1-5 As shown, the device includes a main body 1, a pressure head 4, and a base 5. Mounting seats 8 are connected to the bottom of the pressure head 4 and the top of the base 5. The mounting seats 8 are detachably connected to the pressure head 4 and the base 5. A contact plate 9 is connected to the outer ring of the mounting seat 8. The end face of the contact plate 9 transitions to the outer ring via an arc. The bottom of the contact plate 9 is smooth and flat. A limiting bolt 12 passes through the outer surface of the mounting seat 8. An anti-loosening washer is provided on the outside of the limiting bolt 12. The limiting bolt 12 is threadedly connected to the pressure head 4 and the base 5, and abuts against the mounting seat 8. A retaining plate 10 is fixed inside the mounting seat 8. The clamping plate 10 has an "L"-shaped longitudinal section. The top of the pressure head 4 and the bottom of the base 5 both have "L"-shaped slots 11. The clamping plate 10 and the slots 11 are detachably connected. During measurement, such as conventional metal pressure application, the contact plate 9 is made of stainless steel or other metal materials. The edges of the contact plate 9 are chamfered to form a rounded transition, and the contact surface between the contact plate 9 and the flexible sensor is mirror-polished to prevent burrs, wind-induced edges, etc., from scratching or puncturing the flexible sensor during testing. The mounting base 8 is detachable for easy installation. Replacing the contact plate 9 promptly after it wears out reduces waste and material consumption compared to replacing the entire pressure head 4, resulting in lower costs. When replacing a worn contact plate 9 or a different type of contact plate 9, the operator first removes the limit bolt 12 and the anti-loosening washer. Then, the operator rotates the contact plate 9 or the mounting base 8 to rotate the clamping plate 10 to a larger area of ​​the slot 11. The mounting base 8 and the contact plate 9 can then be removed vertically. During installation, the operator aligns the clamping plate 10 with the larger area of ​​the slot 11, and then the operator inserts the mounting base 8 and... After the pressure head 4 or base 5 is attached, the operator rotates the mounting base 8 to make the card plate 10 rotate to a smaller area of ​​the card slot 11, thereby limiting the mounting base 8 and preventing it from falling vertically, thus completing the installation of the contact plate 9. After the mounting base 8 is installed, the operator screws in the limiting bolt 12 to prevent the mounting base 8 from rotating due to vibration during the reciprocating up and down movement, so as to prevent the mounting base 8 from falling off and damaging the flexible pressure sensor. In addition, the limiting bolt 12 has an anti-loosening washer, which can prevent the limiting bolt 12 from loosening and falling off due to vibration.

[0040] See Figure 1 and Figure 2In the above embodiment, an electric cylinder 2 is installed on the top of the main body 1. The output end of the electric cylinder 2 is connected to a pressure head 4 through a force sensor 3. A base 5 is connected to the lower part of the main body 1, and a control cabinet 6 is installed on the upper part of the main body 1. The cabinet door of the control cabinet 6 is equipped with a display screen and control buttons. Cables 7 are connected to both sides of the bottom of the control cabinet 6, and one end of each cable 7 is connected to an alligator clip. The operator places the flexible pressure sensor to be tested on the base 5, and then connects the cable 7 to the contact terminal of the flexible pressure sensor through the alligator clip. At this time, the preparation is completed, and the operator can then control the electric cylinder 2 to start through the control cabinet 6. The advantage of using an electric cylinder 2 is that, compared with a hydraulic cylinder, there is no risk of hydraulic oil leakage and contamination. Compared with hydraulic cylinders and pneumatic cylinders, the structure is simple, without complicated pipelines, valves, pumps, and hydraulic oil or compressed air containers. Moreover, the electric cylinder 2 can be precisely controlled by a servo. The electric cylinder 2 controls the stroke and pressure to prevent excessive pressure from causing the flexible pressure sensor to crack or deform. It also features good sealing, long service life, and simple maintenance. After starting, the output of the electric cylinder 2 drives the measuring force sensor 3, the pressure head 4, and the mounting base 8 and contact plate 9 below the pressure head 4 to move downwards, thus applying pressure to the flexible pressure sensor. During this process, the measuring force sensor 3 and the force sensor used for measurement perform real-time, high-precision measurements of the force applied to the flexible pressure sensor, preventing excessive pressure and allowing comparison with the pressure received by the flexible pressure sensor. The flexible pressure sensor converts the received pressure into an electrical signal, which is sent to the control cabinet 6 via cable 7. The active measurement unit in the control cabinet 6 can then perform calculations. After the measurement is completed, the output of the electric cylinder 2 retracts, retracting the measuring force sensor 3, the pressure head 4, and other structures. At this point, the operator can unload the tested flexible pressure sensor.

[0041] Example 2:

[0042] Based on the above embodiment one, the following settings are now adopted to increase structural strength.

[0043] See Figures 2-5 In the above embodiments, multiple card plates 10 and card slots 11 are provided, and the multiple card plates 10 and card slots 11 are distributed in a double-ring array. By increasing the number of card plates 10 and card slots 11, the connection surface and support points of the structure are increased, thereby improving the stability of the mounting base after installation.

[0044] Example 3:

[0045] Based on the above embodiment one, the following settings are now adopted to be applicable to different scenarios.

[0046] See Figures 1-5In the above embodiments, the contact plate 9 is made of stainless steel, polyurethane foam, silicone rubber, POM, or EVA foam. Different materials can be used for the contact plate 9 to suit different application scenarios. For example, using hard materials such as stainless steel is suitable for high-precision measurement work. POM material can also be used, which has good pressure resistance and a lower surface friction coefficient than stainless steel, further reducing the possibility of scratching the flexible pressure sensor. Alternatively, contact plates 9 made of foaming materials such as polyurethane foam or EVA foam, or flexible materials such as rubber or silicone rubber, have a certain degree of cushioning, effectively preventing the pressure head 4 from damaging the flexible pressure sensor. It isolates the effects of vibration and can simulate pressure measurement during skin contact. The contact plate 9 is fixedly connected to the mounting base 8, which is also made of stainless steel. When combined with the stainless steel contact plate 9, it can be welded or integrally molded. When combined with materials such as POM, foam, and rubber, it can be fixed by roughening the surface with a primer and adhesive, such as Loctite 770 primer, silane coupling agent primer, cyanoacrylate adhesive, two-component epoxy resin adhesive, two-component polyurethane adhesive, contact adhesive, room temperature vulcanizing silicone rubber adhesive, high-strength modified silane polymer adhesive, water-based polyurethane adhesive, etc.

[0047] The implementation principle of this utility model is as follows: First, the operator places the flexible pressure sensor to be tested on the base 5. Then, the operator connects the cable 7 to the contact terminal of the flexible pressure sensor using alligator clips. At this point, the preparation work is complete, and the operator can then control the electric cylinder 2 to start through the control cabinet 6. The advantages of using the electric cylinder 2 are that, compared to a hydraulic cylinder, there is no risk of hydraulic oil leakage and contamination. Compared to hydraulic cylinders and pneumatic cylinders, it has a simple structure, without complicated pipelines, valves, pumps, or hydraulic oil or compressed air containers. Furthermore, the electric cylinder 2 can be precisely controlled by servo control to control the stroke, pressure, etc., avoiding excessive pressure that could cause the flexible pressure sensor to crack or deform. The electric cylinder 2 also has good sealing performance, long service life, and simple maintenance. After the electric cylinder 2 starts, its output drives the measuring force sensor 3, the pressure head 4, and the pressure head 4. The mounting base 8, contact plate 9, and other structures move downwards to apply pressure to the flexible pressure sensor. During this process, the measuring force sensor 3 and the force sensor used for measurement perform real-time, high-precision measurement of the force applied to the flexible pressure sensor, avoiding excessive pressure and allowing comparison with the pressure received by the flexible pressure sensor. The flexible pressure sensor converts the received pressure into an electrical signal, which is sent to the control cabinet 6 via cable 7. The active measurement unit in the control cabinet 6 can perform calculations. After the measurement is completed, the output end of the electric cylinder 2 retracts to retract the measuring force sensor 3, pressure head 4, and other structures. At this time, the operator can unload the tested flexible pressure sensor. The piezoresistive testing of the flexible pressure sensor is existing technology, and the specific principle and structure are well-known technical solutions in this field. Therefore, this solution only provides a brief description.

[0048] During the measurement process, such as conventional metal pressure application, the contact plate 9 is made of stainless steel or other metal materials. The corners of the contact plate 9 are chamfered to form a rounded transition, and the contact surface between the contact plate 9 and the flexible sensor is mirror polished to avoid burrs, wind-induced corners, etc., which could cause the flexible sensor to be scratched or punctured during testing. The mounting base 8 is detachable, which makes it easy to replace the contact plate 9 in time after it wears out. Compared with replacing the entire pressure head 4, it is less wasteful and requires less material, resulting in lower cost.

[0049] When it is necessary to replace the worn contact plate 9 or replace it with another type of contact plate 9, the operator first removes the limit bolt 12 and the anti-loosening washer, and then the operator rotates the contact plate 9 or the mounting base 8 so that the clamping plate 10 rotates to a larger area of ​​the opening of the clamping slot 11. Then the mounting base 8 and the contact plate 9 can be removed vertically.

[0050] The contact plate 9 can be made of different materials to suit different application scenarios. For example, it can be made of hard materials such as stainless steel, which is suitable for high-precision measurement. It can also be made of POM material, which has good pressure resistance and a lower surface friction coefficient than stainless steel, which can further reduce the phenomenon of scratching the flexible pressure sensor. Alternatively, the contact plate 9 made of foam materials such as polyurethane foam and EVA foam, or flexible materials such as rubber and silicone rubber, has a certain degree of cushioning, which can effectively prevent the pressure head 4 from damaging the flexible pressure sensor, isolate the influence of vibration, and simulate the pressure measurement when in contact with skin. The mounting base 8 is also made of stainless steel. When combined with the stainless steel contact plate 9, it can be welded or integrally molded. When combined with materials such as POM, foam materials, and rubber materials, it can be fixed by roughening the surface and then fixing it with a primer and adhesive, such as Loctite 770 primer, silane coupling agent primer, cyanoacrylate adhesive, two-component epoxy resin adhesive, two-component polyurethane adhesive, contact adhesive, room temperature vulcanizing silicone rubber adhesive, high-strength modified silane polymer adhesive, water-based polyurethane adhesive, etc.

[0051] During installation, the worker aligns the card plate 10 with the larger opening area of ​​the card slot 11. Then, the worker attaches the mounting base 8 to the pressure head 4 or the base 5. The worker then rotates the mounting base 8 to make the card plate 10 rotate to the smaller opening area of ​​the card slot 11, thereby limiting the mounting base 8 and preventing it from falling vertically. This completes the installation of the contact plate 9. After the mounting base 8 is installed, the worker screws in the limiting bolt 12 to prevent the mounting base 8 from rotating due to vibration during reciprocating up and down movements. This prevents the mounting base 8 from falling off and damaging the flexible pressure sensor. The limiting bolt 12 also has an anti-loosening washer to prevent the limiting bolt 12 from loosening and falling off due to vibration.

[0052] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A flexible pressure sensor piezoresistive testing device comprising a device body (1), a pressure head (4) and a base (5), characterised in that: The bottom of the pressure head (4) and the top of the base (5) are both connected to the mounting base (8), and the outer ring of the mounting base (8) is connected to the contact plate (9). The outer surface of the mounting base (8) is penetrated by the limit bolt (12). The mounting base (8) is fixed with a card plate (10). The top of the pressure head (4) and the bottom of the base (5) are both provided with a slot (11).

2. The flexible pressure sensor piezoresistive testing device of claim 1, wherein: The end face of the touch plate (9) is connected to the outer ring by a rounded transition, and the bottom of the touch plate (9) is smooth and flat.

3. The flexible pressure sensor piezoresistive testing device of claim 2, wherein: The contact plate (9) is fixedly connected to the mounting base (8), and the mounting base (8) is detachably connected to the pressure head (4) and the base (5).

4. The flexible pressure sensor piezoresistive testing device according to claim 1, characterized in that: The longitudinal section of the card plate (10) is "L" shaped, and the cross section of the card slot (11) is "L" shaped.

5. The flexible pressure sensor piezoresistive test device of claim 4, wherein: The card plate (10) and the card slot (11) are detached and connected.

6. The flexible pressure sensor piezoresistive testing device of claim 1, wherein: The limiting bolt (12) is provided with an anti-loosening washer on the outside.

7. The flexible pressure sensor piezoresistive testing device of claim 6, wherein: The limiting bolt (12) is threadedly connected to the pressure head (4) and the base (5), and the limiting bolt (12) abuts against the mounting seat (8).

8. The flexible pressure sensor piezoresistive testing device of claim 1, wherein: An electric cylinder (2) is installed on the top of the main body (1) of the device, and the output end of the electric cylinder (2) is connected to a pressure head (4) through a force sensor (3). A base (5) is connected to the lower part of the main body (1). A control cabinet (6) is installed on the upper part of the main body (1), and a display screen and control buttons are installed on the cabinet door on the surface of the control cabinet (6). Cables (7) are connected to both sides of the bottom of the control cabinet (6), and one end of each cable (7) is connected to an alligator clip.

9. The flexible pressure sensor piezoresistive testing device of claim 5, wherein: Multiple card plates (10) and card slots (11) are provided, and the multiple card plates (10) and card slots (11) are distributed in a double-ring array.

10. The flexible pressure sensor piezoresistive testing device of claim 3, wherein: The contact plate (9) is made of stainless steel, polyurethane foam, silicone rubber, POM or EVA foam.

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