Device suitable for detecting electrical property of fabric

Abstract

The invention relates to a device and a method suitable for detecting the electrical property of a fabric. The device comprises a frame, an electrode, an automatic pressure applying assembly, an electrical property detecting assembly and a main control assembly, the electrodes comprise a fixed electrode and a movable electrode, and a fabric sample to be detected is placed between the fixed electrode and the movable electrode; the automatic pressure applying assembly comprises a butt joint mechanism, an electric mechanism and a pressure sensor, the automatic pressure applying assembly is connected to the frame through the butt joint mechanism, and the pressure sensor and the moving pole are connected to the electric mechanism; the main control assembly drives the automatic pressure applying assembly to drive the movable pole fixed on the automatic pressure applying assembly to move, and the distance between the fixed pole and the movable pole is changed, so that the pressure applied to the fabric sample by the fixed pole and the movable pole is changed; the pressure sensor feeds back the pressure applied to the fabric sample to the main control assembly, so that closed-loop control is formed, and the purpose of controlling the pressure controllably and accurately is achieved.

Description

Technical Field

[0001] This application relates to electrical performance testing technology for textile fabrics, specifically, to an apparatus and method for using electrodes to hold a fabric sample to be tested, applying pressure to the fabric sample, and detecting the electrical performance of the fabric sample through the electrodes. Background Technology

[0002] Smart seat cushions, smart mattresses, and bionic skin are becoming indispensable technologies in this year's research on smart living. These technologies are suitable for real-time detection of pressure, touch, and other operations applied over large areas in uneven application scenarios, requiring real-time detection of parameters such as the coordinates and pressure values ​​of the applied operations.

[0003] Existing technologies address this need using the following methods: ① Multiple pressure sensors with a pressure transmission mechanism are used for sampling at multiple points. During use, the pressure coordinates and pressure are determined by detecting the real-time output of each pressure sensor; ② Multiple strip-shaped highly conductive material layers (grids) are coated parallel to each other on an insulating film material as the first electrode. Then, piezoresistive plasma is coated onto the first electrode, and finally, multiple strip-shaped highly conductive material layers that are not parallel to the first electrode are coated parallel to each other on the piezoresistive plasma coating as the second electrode. During use, the pressure coordinates and pressure are detected by detecting the resistance or capacitance values ​​between the grids of the two electrodes; ③ The conductive paste is mixed with a spinnable material and spun into fabric, or the conductive paste is mixed with a spinnable material and made into nonwoven fabric. Then, grids are arranged non-parallel on both sides of the fabric. During use, the pressure coordinates and pressure are detected by detecting the resistance or capacitance values ​​between the grids of the two electrodes.

[0004] Of the above methods, method ① has a complex structure, high cost, poor adaptability to uneven application scenarios, and is not suitable for use in scenarios with high comfort requirements such as seat cushions and mattresses, let alone for application scenarios with complex shapes, complex force directions, and small spaces, such as bionic skin; method ② uses insulating film material as the base material, which has poor flexibility, lacks breathability and moisture-wicking properties, and is not suitable for use in home textiles or clothing.

[0005] Method ③ has become the preferred choice for this application scenario. However, the manufacturing process of the fabric determines that the fabric itself is difficult to achieve the level of consistency, uniformity, repeatability, and linearity in electrical properties suitable for electronic sensor applications. Significant improvements need to be made to the manufacturing process and process control needs to be strengthened to make it suitable for electronic sensor applications. Therefore, a dedicated detection device is needed that is lightweight and easy to use for real-time detection of samples.

[0006] In existing testing technologies, the electrical performance testing of the aforementioned fabrics generally employs the following method: A flat conductive surface is set as the bottom electrode, and the fabric sample is laid on top of the bottom electrode. An upper electrode with a known area (much smaller than the area of ​​the bottom electrode) is placed on top of the fabric sample. Weights of different masses are replaced on the upper electrode, and the resistance and / or capacitance values ​​between the bottom and upper electrodes are measured simultaneously. The fabric sample is moved, and the above testing process is repeated to obtain the resistance and / or capacitance values ​​of different areas of the sample under different weight pressures, thereby determining whether the electrical performance of the sample meets the standards.

[0007] The above-mentioned detection technology is simple and low-cost, but it has the following problems: 1) The entire process is manual, as the upper electrode generally requires a small area (e.g., 100mm²). 2 This method aims to detect the consistency or repeatability of the electrical properties of fabric within a subdivided area. However, the base area of ​​large-mass weights is generally large, and even with custom-made, high-strength weights, the stability of their placement on the small-area upper electrode becomes a challenge for manual operation. Therefore, whether the weights are placed eccentrically or tilted during manual placement will cause uneven stress on the fabric between the bottom and top electrodes, leading to inaccurate test results.

[0008] 2) Frequent weight changes are required, making the operation cumbersome, labor-intensive, and prone to errors.

[0009] 3) Low efficiency, which is not conducive to collecting large amounts of data to make real-time corrections to the manufacturing process. Summary of the Invention

[0010] In response to the limitations of traditional technologies in practical research and development, production, and market demands, and to solve the existing technical problems, this invention provides a device and method for testing the electrical properties of fabrics. The testing device has a simple structure, a high degree of automation, high control precision, and high testing efficiency. The testing method provides fast testing speed, instant detection and immediate results, improving the effectiveness and providing more accurate data. It is highly practical and suitable for large-scale promotion and application.

[0011] To meet practical needs, this invention provides an apparatus and method for testing the electrical properties of fabrics, overcoming current limitations in fabric electrical property testing and offering a practical and convenient solution. The technical solution of this invention is as follows: A device for testing the electrical properties of fabrics includes a frame, electrodes, an automatic pressure application component, an electrical property testing component, and a main control component. The electrode includes a fixed electrode and a movable electrode, and the fabric sample to be tested is placed between the fixed electrode and the movable electrode. The automatic pressure application assembly includes a docking mechanism, an electric mechanism, and a pressure sensor. The docking mechanism is connected to the frame, and the pressure sensor and the moving pole are connected to the electric mechanism. The main control component drives the automatic pressure application component, which in turn moves the movable pole fixed on the automatic pressure application component, changing the distance between the fixed pole and the movable pole, thereby changing the pressure applied to the fabric sample by the fixed pole and the movable pole; the pressure sensor feeds back the pressure applied to the fabric sample to the main control component, forming a closed-loop control, so as to achieve the purpose of controllable and precise pressure control. Under the control of the main control component, the electrical performance testing component detects and records the electrical performance of the fabric sample under different pressures.

[0012] This solution provides a closed-loop control consisting of a main control component, an electric mechanism, and a pressure sensor, which enables two electrodes to clamp the fabric sample to be inspected and apply arbitrary pressure to the fabric sample. At the same time, the electrical properties of the clamped fabric sample are detected by the two electrodes.

[0013] The electrical properties include, but are not limited to, the resistance and / or capacitance values ​​of the fabric detected by the fixed and moving electrodes.

[0014] Compared to traditional methods that involve placing and replacing weights, this method has the following advantages: 1) More realistic test results can be obtained: the force between the electrodes is balanced (avoiding the force imbalance caused by the eccentric placement of weights in traditional technology), the test conditions within the sample test surface are consistent, and the results output to the electrodes truly reflect the electrical properties of the fabric under the specified pressure.

[0015] 2) Finer Detection Steps: Traditional techniques change the pressure applied to the fabric sample by changing weights of varying masses, resulting in a wide range of weight mass increments. Fabrics, composed of stacked fibers (especially woven fabrics), are susceptible to sudden collapse of fiber cross-sections (e.g., C-shaped cross-section fibers) or sudden misalignment between fibers under certain pressure, inevitably causing abrupt changes in the fabric's electrical properties. Identifying these abrupt changes during fabric development allows for targeted improvements in fiber structure or weaving processes. Furthermore, accurately identifying these inflection points in the fabric's electrical properties during the application design phase allows for the pre-setting of precise characteristic curves for fabric performance, leading to accurate application results. Therefore, finer pressure adjustments are more effective in accurately identifying these abrupt changes. This solution adjusts the electrode spacing via an electric mechanism, thereby adjusting the pressure applied to the fabric sample. This allows for finer pressure adjustment steps than traditional weight-changing methods, enabling more precise detection of these abrupt changes and a more accurate correlation between pressure and electrical properties.

[0016] 3) High efficiency: No frequent weight changes are required. By setting different pressures through the main control component, the electric mechanism is driven to move. Closed-loop feedback from the pressure sensor quickly obtains the desired pressure conditions between the two electrodes. Simultaneously, the main control component controls the electrical performance detection component to detect and record the electrical performance under the corresponding pressure. Clearly, compared to manual weight changes, this solution offers a higher degree of automation, more precise control, and higher efficiency.

[0017] As a further technical solution, there are multiple pairs of fixed electrodes and movable electrodes, or the fixed electrode is a large-area flat plate electrode, and there are multiple movable electrodes, forming multiple pairs of electrodes with the same fixed electrode. The main control component drives the automatic pressure application component to change the pressure applied to the fabric sample by each pair of electrodes, and detects and records the electrical properties of the fabric sample under different pressures at the locations of each pair of electrodes.

[0018] This solution provides a "multi-point simultaneous detection" technology, enabling the testing device to simultaneously perform electrical performance tests on different locations of the same fabric sample under varying pressures. This further improves testing efficiency and allows the device to acquire multi-point data from the same fabric sample at once. This facilitates the direct acquisition of the fabric's overall electrical performance parameters through the device's analysis software, eliminating the need for manual operation to acquire multiple data points separately and then manually "inform" the testing equipment which data points come from the same fabric sample. Clearly, this solution offers a higher level of intelligence and yields superior testing results.

[0019] As an optional technical solution, the fixed electrode is a horizontally arranged conductive plate; The frame includes a column vertically fixed to the fixed pole and a horizontal arm vertically mounted on the column. The automatic pressure application component has an electric motor as its electric mechanism and a coupling mechanism consisting of a speed-changing mechanism and a linear bearing connecting the electric motor and the column. Under the control of the main control component, the automatic pressure application component moves up and down along the column. The pressure sensor is installed at the end of the horizontal arm away from the column, and a horizontally arranged movable pole is installed at the lower end of the pressure sensor.

[0020] This solution offers a more specific technical approach: a vertical column supports two horizontally arranged fixed and movable electrodes. The movable electrode is driven by an automatic pressure-applying component that moves up and down along the column, changing the distance between it and the fixed electrode. This alters the pressure applied to the fabric sample held between the two electrodes, allowing for the detection and recording of the fabric's electrical properties at its current position under that pressure. In this solution, the automatic pressure-applying component is powered by an electric motor, which, via a speed-changing mechanism and linear bearings, drives the movable electrode up and down. A pressure sensor forms a closed-loop control system, enabling precise pressure control.

[0021] The electric motor is a mature motion component, making the motion control of this solution reliable and highly accurate.

[0022] As a further technical solution, an elastic component is provided between the pressure sensor and the moving electrode, or between the horizontal arm and the pressure sensor, or the horizontal arm is elastic.

[0023] This design provides a degree of elasticity to the moving electrode, buffering the movement of the electric mechanism. Compared to designs without this elasticity, this design allows for a greater stroke of the electric mechanism under the same pressure conditions due to the elasticity (taking a spring as an example, the force compressing the spring is directly proportional to the compression stroke; by selecting a spring with a suitable elastic coefficient, the electric mechanism can achieve the appropriate stroke). It is well known that if the two electrodes have a hard-on-hard structure, theoretically, pressure adjustment between the electrodes needs to be completed within a very small stroke. If a finer motor stroke is required, a transmission mechanism with a larger reduction ratio is necessary, which not only increases costs but also significantly reduces the electric mechanism's travel speed and work efficiency. This design, by incorporating elasticity, significantly increases the motor stroke under the same pressure, making pressure finer division easier to achieve, pressure control more precise, and work efficiency higher.

[0024] As a further technical solution, the horizontal arm can rotate around the column as an axis to change the position of the fabric sample facing the fixed pole and the moving pole, and to detect the electrical properties of different areas of the fabric sample.

[0025] This solution allows for changing the fabric detection area through the movement of the detection device itself. In the optional semi-automatic scheme, after the detection device completes the detection of the current fabric position, manually rotating the horizontal arm by a certain angle changes the fabric area facing the two electrodes, enabling detection of different areas. In the optional fully automatic scheme, an electric rotating mechanism is installed between the horizontal arm and the column, electrically connected to the main control component. The main control component then controls the rotation of the horizontal arm. By controlling the rotation angle, automatic point selection and multi-point automatic detection are achieved, completing the electrical performance testing and recording of multiple points on the current fabric in one go, resulting in higher automation and work efficiency.

[0026] As an optional technical solution, the frame includes a first arm and a second arm arranged opposite to each other; the first ends of the first arm and the second arm are connected by a docking shaft, wherein one end of the docking shaft is fixed to the first end of the first arm, and the other end is movably connected to the first end of the second arm, and a spring is sleeved on the docking shaft between the first arm and the second arm. The end of the docking shaft that connects to the second support arm is provided with an external thread, and a coarse adjusting nut that is installed at the end of the docking shaft through the external thread; The automatic pressure application assembly includes an electromagnet, an armature, and a pressure sensor; the electromagnet is fixed to the second end of the first arm, and its side facing the second arm has a fixed pole; the pressure sensor is fixed to the second end of the second arm, and its side facing the first arm has an armature installed, which also serves as a movable pole. When the electromagnet is energized, it generates a magnetic field that attracts the armature, bringing the distance between the electromagnet and the armature closer, thereby changing the pressure applied to the fabric sample between the fixed pole and the moving pole. By adjusting the current of the electromagnet, the pressure applied to the fabric sample by the fixed pole and the moving pole can be adjusted.

[0027] This solution offers another more specific technical approach: two parallel arms are connected from one end by a docking shaft, spring, and coarse adjustment nut. One arm has an electromagnet and a fixed electrode mounted on one end, while the other arm has a pressure sensor and a moving electrode mounted on the opposite end. Adjusting the coarse adjustment nut quickly adjusts the distance between the two electrodes, bringing them closer to the fabric sample clamped between them. Energizing the electromagnet generates a magnetic field, which in turn creates a magnetic force on the armature positioned opposite it, causing the armature and magnet to move towards each other until they press against the fabric sample, applying pressure. Adjusting the current through the electromagnet regulates the pressure applied to the fabric sample by the two electrodes. The pressure sensor provides real-time feedback of the pressure information, forming a closed-loop control system. This system precisely controls and maintains the pressure applied to the fabric sample by the two electrodes, providing stable testing conditions for the electrical performance testing component to accurately detect and record the electrical properties of the fabric sample under the current pressure.

[0028] In this scheme, the operating current of the electromagnet is subdivided, which means that the pressure applied to the fabric sample can be subdivided, providing different pressure detection conditions for the electrical performance detection component, thereby obtaining the electrical performance of the fabric sample under each subdivided pressure.

[0029] Compared with the solution of using an electric motor as the power source for the electric mechanism, this solution does not have a speed change mechanism or complex precision components such as bearings / guide rails. It has a simple structure, low cost, and is easy to maintain.

[0030] Compared to traditional techniques, this solution offers a simple structure, providing automatic and precise subdivision of pressure to determine the electrical properties of fabric samples under various subdivision pressures. A single operation can batch-obtain electrical performance parameters corresponding to multiple pressures, resulting in high efficiency. Sufficiently accurate pressure conditions can be obtained as long as the electromagnet current is sufficiently subdivided.

[0031] As a further technical solution, an elastic component is provided between the second arm and the armature, or one or both of the first arm and the second arm are elastic, so that when the electromagnet and the armature are attracted, there is a buffer in the attraction stroke.

[0032] This scheme utilizes an elastic element (equivalent to an elastic band) positioned between the two electrodes to buffer the stroke of the armature under the magnetic force of the electromagnet, thereby improving the accuracy of pressure control. Empirically, the measured magnetic field and current of the electromagnet exhibit a non-linear relationship when the current is below a certain range (initial stage) and above a certain range (approaching magnetic saturation). The aforementioned elasticity allows the pressure between the electromagnet and the armature (ultimately transmitted as pressure between the two electrodes) to partially or completely avoid the non-linear region, facilitating more precise pressure control.

[0033] As an optional technical solution, the frame is a tweezers structure, including an integrally arranged first and second clamping arms. The automatic pressure application component includes an electromagnet, an armature, and a pressure sensor; The electromagnet is fixed to the end of the first clamping arm on the side facing the second clamping arm, and a fixed pole with a height not lower than the height of the electromagnet is fixed at a position adjacent to the electromagnet. The armature is installed on the end of the second clamping arm facing the first clamping arm, and a movable pole is provided at a position adjacent to the armature and opposite to the first electrode. The height of the movable pole is not lower than the height of the armature. When the electromagnet is energized, it generates a magnetic field that attracts the armature, bringing the distance between the electromagnet and the armature closer, thereby changing the pressure applied to the fabric sample between the fixed pole and the moving pole. By adjusting the current of the electromagnet, the pressure applied to the fabric sample by the fixed pole and the moving pole can be adjusted.

[0034] This solution offers a more specific technical approach: At both ends of the tweezers (or clamps) structure (away from the connected ends), an electromagnet with a fixed electrode and an armature with a movable electrode are respectively installed. In this solution, energizing the electromagnet generates a magnetic field, which in turn generates a magnetic force on the armature located opposite it. This causes the armature and the magnet to move towards each other, moving the movable electrode towards the fixed electrode until both electrodes press against the fabric sample, creating pressure. Adjusting the current through the electromagnet regulates the pressure applied to the fabric sample by the two electrodes. A pressure sensor provides real-time feedback of the pressure information, forming a closed-loop control system. This allows for precise control and maintenance of the pressure applied to the fabric sample by the two electrodes, providing stable testing conditions for the electrical performance testing component to accurately detect and record the electrical properties of the fabric sample under the current pressure.

[0035] Compared to solutions using an electric motor as the power source for the electric mechanism, this solution eliminates the need for a speed-changing mechanism and complex precision components such as bearings / guide rails, resulting in a simpler structure, lower cost, and easier maintenance. In this solution, only the current of the electromagnet needs to be adjusted to regulate the pressure applied to the fabric sample by the fixed and moving poles. As long as the electromagnet current is controlled sufficiently finely, the pressure applied to the fabric sample by the fixed and moving poles can be sufficiently subdivided, thus allowing for the determination of the electrical properties of the fabric sample under each subdivided pressure. A single operation can obtain a batch of electrical performance parameters corresponding to multiple pressures, resulting in high work efficiency and accurate test results.

[0036] As a further technical solution, the connecting end of the first and second clamping arms of the frame is provided with an adjusting post; one end of the adjusting post is fixed to one of the clamping arms, and the other end is provided with an external thread, which passes through a hole on the other clamping arm and is provided with a coarse adjusting nut. The adjusting nut can adjust the distance between the first and second clamping arms. A spring is fitted in the area between the first and second clamping arms of the adjusting column.

[0037] This solution provides a coarse adjustment technique for the electrode spacing of the tweezer-type detection device. Since the effective working distance between the electromagnet and armature is limited, typically only a few millimeters, this limited space makes it difficult to place fabric samples inwards. Therefore, this solution provides a coarse adjustment method using an adjustment column + spring + coarse adjustment nut structure. By rotating the coarse adjustment nut, the spacing between the two clamping arms can be quickly and widely adjusted with the assistance of the spring force and the elasticity of the two clamping arms of the tweezers structure. This facilitates the quick and easy placement of the fabric sample to be tested between the two electrodes, ready for detection. This solution makes the detection device more convenient to operate, more user-friendly in structure, and more efficient in operation.

[0038] A method for testing the electrical properties of fabrics, comprising testing the fabric using the apparatus described in any of the above-mentioned schemes, and the specific method including the following steps: Install the sample to be tested: Place the fabric sample to be tested between the fixed electrode and the moving electrode, and smooth it out; Coarse adjustment of electrode spacing: The main control component controls the motor to work, or the coarse adjustment nut is adjusted to bring the moving electrode closer to the fixed electrode, and the pressure applied to the sample to be tested begins to be slightly greater than 0. Given pressure: The main control component and the automatic pressure application component form a closed-loop control system, which drives the control motor to work or supplies power to the electromagnet so that the pressure applied to the sample to be tested is equal to the set pressure value. Test results: Test and record the electrical properties between the fixed electrode and the moving electrode under the current pressure; Same-site retest: Keep the fabric sample stationary, change the set pressure value, repeat the steps of giving the pressure and recording the test results to obtain the electrical properties of the current area of ​​the fabric sample under different pressures; Repositioning and retesting: The main control component controls the motor to work, or adjusts the coarse adjustment nut to release the pressure applied to the fabric sample, change the relative position between the fabric sample and the electrode, and then repeat the steps of coarse adjustment of electrode spacing, given pressure, detection and recording results, and repositioning and retesting to obtain the electrical properties of different areas of the current fabric sample under different pressures.

[0039] This solution provides a detailed testing process that automatically and simultaneously acquires the electrical properties of a specific location on a fabric sample under different set pressures. By changing the tested location on the fabric, the electrical properties of different areas of the same fabric sample under various pressures can be repeatedly acquired. Using this method, the electrical property data of fabric samples can be obtained automatically and in one go, providing a basis for further data analysis. The entire process requires minimal human intervention, boasts a high degree of automation and repeatability, and leverages the advantages of the aforementioned testing device to obtain more accurate test results. Because the testing equipment acquires a sufficient amount of data at once, it is more conducive to data processing by analysis software to obtain more practically valuable results. Attached Figure Description

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 A schematic diagram of the results from a vertical testing device driven by an electric motor; Figure 2 A schematic diagram of the results of a double-arm detection device that applies pressure to an electromagnet. Figure 3 A schematic diagram of the results from a tweezers-type testing device that applies pressure to an electromagnet; Figure 4 This is a flowchart illustrating the detection method using the aforementioned detection device. Detailed Implementation

[0041] Example 1 – Vertical Testing Device Driven by an Electric Motor like Figure 1 As shown, the electric motor-driven vertical testing device 1 consists of a fixed pole 11, a column 12, a horizontal arm 13, a pressure sensor 14, a moving pole 15, a spring 16, an electric motor 17, a speed-changing mechanism 18, a linear bearing 19, and necessary main control components (not shown) and electrical performance testing components (not shown). Among them: The fixed electrode 11 is made of a flat conductive material. The column 12 is vertically fixed on the fixed electrode 11. The motor 17 is connected to the column 12 through the speed change mechanism 18 and the linear bearing 19. The horizontal arm 13 is fixedly installed on the connector formed by the speed change mechanism 18 and the linear bearing 19. When the motor 17 is working, it can drive the connector formed by the speed change mechanism 18 and the linear bearing 19 to move up and down along the column 12, thereby driving the horizontal arm 13 to move up and down. A pressure sensor 14 is fixed on the lower end of the horizontal arm 13. A spring 16 is fixed on the sensitive end of the lower end of the pressure sensor 14 (not shown due to angle). A moving electrode 15 is fixed on the lower end of the spring 16.

[0042] During operation, the fabric sample to be tested is placed in the gap between the fixed electrode 11 and the movable electrode 15, ensuring it is flat and unaffected by external forces. The main control component (not shown) drives the motor 17 to reduce the distance between the movable electrode 15 and the fixed electrode 11 until they are close to the fabric sample. The pressure sensor 14 provides real-time closed-loop feedback on the pressure applied to the fabric sample by both electrodes. Once the pressure applied to the fabric sample by the movable electrode 15 and the fixed electrode 11 equals the set value, the motor 17 stops working, maintaining the pressure applied to the fabric sample by the movable electrode 15 and the fixed electrode 11 at a constant set value. Then, the main control component (not shown) controls the electrical performance detection. A component (not shown) detects and records the electrical properties (resistance, and / or capacitance, etc.) of the fabric sample clamped between the two electrodes via the movable electrode 15 and the fixed electrode 11. The main control component (not shown) drives the motor 17 to continue working until the pressure applied to the fabric sample by the movable electrode 15 and the fixed electrode 11 reaches another set value, at which point the motor 17 stops. The main control component (not shown) then controls the electrical property detection component (not shown) to detect and record the electrical properties of the fabric sample under the current pressure. By repeating the above steps, the electrical properties of the fabric sample at its current position (the area clamped by the movable electrode 15 and the fixed electrode 11) under different pressures can be obtained for subsequent analysis.

[0043] During this process, after the pressure applied to the fabric sample by the moving pole 15 and the fixed pole 11 is greater than 0, the length of the spring 16 will be gradually compressed, following Hooke's Law, F=kx (F is the pressure on the spring, k is the spring constant or elasticity coefficient, and x is the deformation of the spring). This provides a buffer space for the running stroke of the motor 17 in pursuit of a certain pressure value. By reasonably selecting a spring with a suitable spring constant k, the ratio of the stroke of the motor 17 to the pressure can be significantly increased, which is equivalent to greatly improving the stroke "resolution" or subdivision step number of the motor 17 when pursuing a certain pressure value, thereby greatly improving the accuracy of the pressure control of this detection device.

[0044] Clearly, compared to the traditional technique of manually changing weights, this embodiment offers the following advantages: ① It improves the automation and efficiency of the testing process; ② It obtains the electrical properties of the fabric sample at different pressures at its current position in a single test; ③ The testing process is continuous, preventing the fabric sample from shifting during pressure changes (as in traditional techniques where changing weights inevitably causes positional shifts), thus avoiding result drift caused by positional shifts and improving accuracy; ④ It provides high pressure precision, enabling the testing of the fabric sample's electrical properties under more precise pressure settings.

[0045] In another embodiment, the horizontal arm 13 can rotate along the column 12, or the horizontal arm 13 can be designed as multi-axis, such as two axes (X-axis + Y-axis), all of which are controlled by the main control component. Under the unified control of the main control component, the moving pole 15 can automatically move horizontally within the plane range of the fixed pole 11 to complete multi-point sampling (detecting multiple positions of the fabric sample). The advantages of implementation are: ① It can complete the electrical performance detection of different points of the entire fabric sample under different pressures in one go, with a higher degree of automation and higher efficiency; ② It is fully automatic, completely avoiding errors caused by manual operation, and the sampling accuracy is higher.

[0046] Example 2 – Double-arm detection device using electromagnet pressure like Figure 2 As shown, the double-arm detection device with electromagnet pressure consists of a first arm 21, a second arm 22, a docking shaft 23, a compression spring 24, a coarse adjustment nut 25, an electromagnet 26, a fixed pole 27, a pressure sensor 28, an armature 29 (which also serves as a moving pole; to ensure consistency between the name and function in the description, the terms armature 29 and moving pole 29 may appear in the following text, both referring to the armature that also functions as a moving pole), as well as necessary main control components (not shown) and electrical performance detection components (not shown). Among them: One end of the docking shaft 23 is fixed to the first end of the first support arm 21, and the other end passes through a hole on the first end of the second support arm 22. The end of the shaft has an external thread 2C. A coarse adjusting nut 25 is screwed onto the external thread of the docking shaft 23. A compression spring 24 is fitted onto the docking shaft 23 between the first support arm 21 and the second support arm 22. Adjusting the coarse adjusting nut 25 changes the distance between the first support arm 21 and the second support arm 22. At the second end of the first arm 21, an electromagnet 26 is fixed, and a fixed pole 27 is fixed on the side of the electromagnet facing the second arm 22. At the second end of the second arm 22, on the side facing the first arm 21, a pressure sensor 28 and an armature moving pole 29 are sequentially installed. To allow for a travel buffer for the moving pole, the pressure sensor 28 and the second arm 22 are movably mounted, with a buffer spring 2A and an end cap 2B between them. The buffer spring 2A and the end cap 2B, together with the second arm 22, limit the range of motion of the pressure sensor 28 and the moving pole 29 connected to it, thus providing a limited travel buffer for the pressure sensor 28 and the moving pole 29.

[0047] During operation, the fabric sample to be tested is placed between the fixed pole 27 and the movable pole 29 and smoothed. Then, the coarse adjustment nut 25 is adjusted to bring the fixed pole 27 and the movable pole 29 closer together, applying slight pressure to the fabric sample. According to the testing requirements, the main control component (not shown) outputs a drive current to the electromagnet 26, causing the electromagnet 26 to generate magnetic force, attracting the armature 29 (which also serves as the movable pole). This creates a compressive force between the two poles, positively correlated with the drive current of the electromagnet 26, which is applied to the fabric sample placed between them. The pressure sensor 28, fixed to the armature 29, synchronously senses the pressure between the fixed pole 27 and the movable pole 29, forming a closed-loop control through feedback to ensure the pressure... Force = a set value; then, the main control component (not shown) controls the electrical performance detection component (not shown) to detect and record the electrical performance (resistance value and / or capacitance value, etc.) between the fixed electrode 27 and the movable electrode 29. This electrical performance standardizes the electrical performance of the current clamping area of ​​the fabric sample held by the two electrodes under the current pressure; then, according to the test requirements, the main control component (not shown) changes the pressure value applied to the fabric sample by the two electrodes by changing the driving current of the electromagnet 26, and the electrical performance detection component (not shown) detects and records the electrical performance data under the current pressure again; this cycle continues until the electrical performance data under the predetermined multiple pressure values ​​are detected and recorded.

[0048] Compared to Example 1, this example does not have a speed-changing mechanism or complex structures such as linear bearings. The pressure on the fabric sample to be tested is completed by an electromagnet and an armature. The pressure on the fabric sample to be tested is changed by adjusting the current of the electromagnet. As long as the driving current of the electromagnet is fine enough, the pressure provided to the fabric sample is accurate enough to achieve the purpose of detecting the electrical properties of the fabric under various specified pressures.

[0049] This embodiment has a simple structure, low cost, and is easy to operate and maintain. It can acquire the electrical properties of the fabric sample at the current clamping position under different specified pressures in one go. It requires less manual intervention, is highly efficient, and provides accurate test results.

[0050] Compared to Example 1, this example is more versatile and flexible in use, suitable for both fixed laboratories and various field applications as a mobile or portable instrument.

[0051] In another embodiment, two docking shafts 23 are provided in parallel to define the relative positions of the two arms and prevent one of them from rotating along a single docking shaft, which would cause the two arms to misalign and result in inaccurate test results.

[0052] In another embodiment, the first arm 21 and the second arm 22, as well as the accessories installed on them, are provided in multiple sets, all of which are uniformly controlled by the main control component (not shown). The electrical properties of different points of the fabric sample under different specified pressures can be obtained in one test, which is more automated and more efficient.

[0053] Example 3 – Tweezers-type detection device using electromagnet pressure like Figure 3 As shown, the tweezer-type detection device with electromagnet pressure consists of a first clamping arm 32, a second clamping arm 31, an adjusting column 33, a coarse adjusting nut 34, a pressure spring 35, a moving pole 36, an electromagnet 37, an armature 38, a pressure sensor 39 (the side facing the moving pole 36 also serves as the fixed pole), and necessary main control components (not shown) and electrical performance detection components (not shown). Among them: The first clamping arm 32 and the second clamping arm 31 are an integral semi-return structure, forming a tweezers-like structure. At the end where the two clamping arms are connected, one end of the adjusting post 33 is fixed to the first clamping arm 32, and the other end passes through the hole on the second clamping arm 31 and is provided with an external thread at the end. The coarse adjustment nut 34 is screwed to the adjusting post 33 through the external thread. A compression spring 35 is sleeved between the two clamping arms of the adjusting post 33. The distance between the two clamping arms can be adjusted by rotating the coarse adjustment nut 34. At the open end of the tweezers structure, on the side of the first clamping arm 32 facing the second clamping arm 31, an armature 38 and a pressure sensor 39 (which also serves as a fixed pole) are fixed; on the side of the second clamping arm 31 facing the first clamping arm 32, an electromagnet 37 and a movable pole 36 are fixed; in relative positions, the armature 38 is opposite to the electromagnet 37, and the pressure sensor 39 (which also serves as a fixed pole) is opposite to the movable pole 36.

[0054] During operation, the fabric sample to be tested is placed between the pressure sensor 39 (which also serves as the fixed electrode) and the moving electrode 36, and smoothed. Then, the coarse adjustment nut 34 is adjusted to bring the pressure sensor 39 (which also serves as the fixed electrode) and the moving electrode 36 closer together, applying a slight pressure to the fabric sample. According to the testing requirements, the main control component (not shown) outputs a drive current to the electromagnet 37, causing the electromagnet 37 to generate magnetic force, attracting the armature 38, creating a compressive force between them that is positively correlated with the drive current of the electromagnet 37, which is applied to the fabric sample placed between them. The pressure sensor 39 simultaneously senses the pressure between the fixed electrode and the moving electrode 36, forming a closed-loop control through feedback, thus ensuring the pressure is applied correctly. Pressure = a set value; then, the main control component (not shown) controls the electrical performance detection component (not shown) to detect and record the electrical performance (resistance value and / or capacitance value, etc.) between the fixed electrode and the moving electrode 36. This electrical performance standardizes the electrical performance of the current clamping area of ​​the fabric sample held by the two electrodes under the current pressure; then, according to the test requirements, the main control component (not shown) changes the pressure value applied to the fabric sample by the two electrodes by changing the driving current of the electromagnet 37, and the electrical performance detection component (not shown) detects and records the electrical performance data under the current pressure again; this cycle continues until the electrical performance data under the predetermined multiple pressure values ​​are detected and recorded.

[0055] Example 4 – Detection Method Using the Detection Device Explained like Figure 4 As shown, using the apparatus of the above embodiment, the electrical performance parameters of multiple points on the same fabric sample under different pressures can be automatically and simultaneously detected in the following way, without human intervention. Specifically: Install the sample to be tested: Place the fabric sample to be tested between the fixed electrode and the moving electrode, and smooth it out; Coarse adjustment of electrode spacing: The main control component controls the motor to work, or the coarse adjustment nut is adjusted to bring the moving electrode closer to the fixed electrode, and the pressure applied to the sample to be tested begins to be slightly greater than 0. Given pressure: The main control component and the automatic pressure application component form a closed-loop control system, which drives the control motor to work or supplies power to the electromagnet so that the pressure applied to the sample to be tested is equal to the set pressure value. Test results: Test and record the electrical properties between the fixed electrode and the moving electrode under the current pressure; Same-site retest: Keep the fabric sample stationary, change the set pressure value, repeat the steps of giving the pressure and recording the test results to obtain the electrical properties of the current area of ​​the fabric sample under different pressures; Repositioning and retesting: The main control component controls the motor to work, or adjusts the coarse adjustment nut to release the pressure applied to the fabric sample, change the relative position between the fabric sample and the electrode, and then repeat the steps of coarse adjustment of electrode spacing, given pressure, detection and recording results, and repositioning and retesting to obtain the electrical properties of different areas of the current fabric sample under different pressures.

[0056] Compared to traditional weight-changing detection techniques, this embodiment only requires "feeding" the fabric sample to be tested into the device described above. The main control component then applies a predetermined pressure to the fabric sample between the two electrodes according to a set program, automatically detecting and recording the electrical properties under the current pressure, and performing performance tests on different points of the fabric sample at the same pressure sequence. This results in a high degree of automation, minimal human intervention, high consistency of detection conditions, more accurate results, and higher efficiency. It effectively addresses the limitations and problems of existing technologies listed in the background section, demonstrating high practicality.

[0057] The foregoing has described specific embodiments of this specification; other embodiments are within the scope of the appended claims. In some cases, the structure described in the claims can be used to achieve the desired results according to the specific embodiments described above. Those skilled in the art can easily achieve the desired results by referring to the foregoing description and its design concepts according to the specific implementation.

[0058] The above description is merely one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, the techniques of one or more embodiments of this specification can be combined in new ways to achieve new implementations, or various modifications and variations can be made. Any modifications, equivalent substitutions, improvements, technical combinations, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of the claims of this specification.

Claims

1. A device suitable for testing the electrical properties of fabrics, characterized in that: Includes frame, electrodes, automatic pressure application assembly, electrical performance testing assembly, and main control assembly; The electrode includes a fixed electrode and a movable electrode, and the fabric sample to be tested is placed between the fixed electrode and the movable electrode. The automatic pressure application assembly includes a docking mechanism, an electric mechanism, and a pressure sensor. The docking mechanism is connected to the frame, and the pressure sensor and the moving pole are connected to the electric mechanism. The main control component drives the automatic pressure application component, which in turn moves the movable pole fixed on the automatic pressure application component, changing the distance between the fixed pole and the movable pole, thereby changing the pressure applied to the fabric sample by the fixed pole and the movable pole; the pressure sensor feeds back the pressure applied to the fabric sample to the main control component, forming a closed-loop control, so as to achieve the purpose of controllable and precise pressure control. Under the control of the main control component, the electrical performance testing component detects and records the electrical performance of the fabric sample under different pressures.

2. The device for testing the electrical properties of fabrics according to claim 1, characterized in that: The fixed electrode and the movable electrode are in multiple pairs, or the fixed electrode is a large-area flat plate electrode and there are multiple movable electrodes, forming multiple pairs of electrodes with the same fixed electrode. The main control component drives the automatic pressure application component to change the pressure applied to the fabric sample by each pair of electrodes, and detects and records the electrical properties of the fabric sample under different pressures at the locations of each pair of electrodes.

3. The device for testing the electrical properties of fabrics according to claim 1, characterized in that: The fixed electrode is a horizontally arranged conductive plate; The frame includes a column vertically fixed to the fixed pole and a horizontal arm vertically mounted on the column. The automatic pressure application component has an electric motor as its electric mechanism and a coupling mechanism consisting of a speed-changing mechanism and a linear bearing connecting the electric motor and the column. Under the control of the main control component, the automatic pressure application component moves up and down along the column. The pressure sensor is installed at the end of the horizontal arm away from the column, and a horizontally arranged movable pole is installed at the lower end of the pressure sensor.

4. The device for testing the electrical properties of fabrics according to claim 3, characterized in that: An elastic component is provided between the pressure sensor and the movable electrode, or between the horizontal arm and the pressure sensor, or The horizontal arm is elastic.

5. The device for testing the electrical properties of fabrics according to claim 3, characterized in that: The horizontal arm can rotate around the column as an axis to change the position of the fabric sample facing the fixed pole and the moving pole, and to detect the electrical properties of different areas of the fabric sample.

6. The device for testing the electrical properties of fabrics according to claim 1, characterized in that: The frame includes a first arm and a second arm arranged opposite to each other; the first ends of the first arm and the second arm are connected by a docking shaft, wherein one end of the docking shaft is fixed to the first end of the first arm and the other end is movably connected to the first end of the second arm, and a spring is sleeved on the docking shaft between the first arm and the second arm. The end of the docking shaft that connects to the second support arm is provided with an external thread, and a coarse adjusting nut that is installed at the end of the docking shaft through the external thread; The automatic pressure application assembly includes an electromagnet, an armature, and a pressure sensor; the electromagnet is fixed to the second end of the first arm, and its side facing the second arm has a fixed pole; the pressure sensor is fixed to the second end of the second arm, and its side facing the first arm has an armature installed, which also serves as a movable pole. When the electromagnet is energized, it generates a magnetic field that attracts the armature, bringing the distance between the electromagnet and the armature closer, thereby changing the pressure applied to the fabric sample between the fixed pole and the moving pole. By adjusting the current of the electromagnet, the pressure applied to the fabric sample by the fixed pole and the moving pole can be adjusted.

7. The device for testing the electrical properties of fabrics according to claim 6, characterized in that: An elastic component is provided between the second arm and the armature, or one or both of the first and second arms are elastic, so that when the electromagnet and the armature are attracted, there is a buffer in the attraction stroke.

8. The device for testing the electrical properties of fabrics according to claim 1, characterized in that: The frame is a tweezers structure, including an integrally arranged first and second clamping arms. The automatic pressure application component includes an electromagnet, an armature, and a pressure sensor; The electromagnet is fixed to the end of the first clamping arm on the side facing the second clamping arm, and a fixed pole with a height not lower than the height of the electromagnet is fixed at a position adjacent to the electromagnet. The armature is installed on the end of the second clamping arm facing the first clamping arm, and a movable pole is provided at a position adjacent to the armature and opposite to the first electrode. The height of the movable pole is not lower than the height of the armature. When the electromagnet is energized, it generates a magnetic field that attracts the armature, bringing the distance between the electromagnet and the armature closer, thereby changing the pressure applied to the fabric sample between the fixed pole and the moving pole. By adjusting the current of the electromagnet, the pressure applied to the fabric sample by the fixed pole and the moving pole can be adjusted.

9. The device for testing the electrical properties of fabrics according to claim 8, characterized in that: The first and second clamping arms of the frame are connected by an adjusting post; one end of the adjusting post is fixed to one of the clamping arms, and the other end is provided with an external thread, which passes through a hole on the other clamping arm and is provided with a coarse adjusting nut. The adjusting nut can adjust the distance between the first and second clamping arms. A spring is fitted in the area between the first and second clamping arms of the adjusting column.

10. A method for testing the electrical properties of fabrics, characterized in that, The fabric is tested using the device for testing the electrical properties of fabrics as described in any one of claims 1 to 9, and the specific method includes the following steps: Install the sample to be tested: Place the fabric sample to be tested between the fixed electrode and the moving electrode, and smooth it out; Coarse adjustment of electrode spacing: The main control component controls the motor to work, or the coarse adjustment nut is adjusted to bring the moving electrode closer to the fixed electrode, and the pressure applied to the sample to be tested begins to be slightly greater than 0. Given pressure: The main control component and the automatic pressure application component form a closed-loop control system, which drives the control motor to work or supplies power to the electromagnet so that the pressure applied to the sample to be tested is equal to the set pressure value. Test results: Test and record the electrical properties between the fixed electrode and the moving electrode under the current pressure; Same-site retest: Keep the fabric sample stationary, change the set pressure value, repeat the steps of giving the pressure and recording the test results to obtain the electrical properties of the current area of ​​the fabric sample under different pressures; Repositioning and retesting: The main control component controls the motor to work, or adjusts the coarse adjustment nut to release the pressure applied to the fabric sample, change the relative position between the fabric sample and the electrode, and then repeat the steps of coarse adjustment of electrode spacing, given pressure, detection and recording results, and repositioning and retesting to obtain the electrical properties of different areas of the current fabric sample under different pressures.

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