A negative pressure suction cup type voltage signal measuring device

Abstract

This application belongs to the technical field of voltage signal measurement, and specifically relates to a negative pressure suction cup type voltage signal measurement device. The edge of the flexible suction cup is fixed to the edge of the bottom of the cavity. An opening is provided at the center of the flexible suction cup, and the opening is connected to the elastic cavity through a conduction tube. The conduction tube movably penetrates through the top of the cavity. The first annular electrode and the second annular electrode are arranged on the outer side of the cavity of the flexible suction cup. The first annular electrode is located on the side close to the edge of the cavity, and the second annular electrode is located on the side close to the center of the flexible suction cup. The first annular electrode and the second annular electrode do not contact. Through the negative pressure adsorption force formed by the flexible suction cup, the present invention enables the electrode to be in close contact with the surface of the object to be measured, avoiding measurement errors caused by poor contact. At the same time, a double annular electrode is designed, and the two cooperate with each other, improving the purity of the signal and the measurement accuracy. Considering the above effects, the present invention has good application prospects in the technical field of voltage signal measurement.

Description

Technical Field

[0001] This application belongs to the technical field of voltage signal measurement, and particularly relates to a negative pressure suction cup type voltage signal measurement device. Background Art

[0002] Voltage signal measurement plays an important role in modern technological applications and is widely used in fields such as industrial automation, environmental monitoring, and medical monitoring. Traditional voltage signal measurement methods usually involve directly attaching electrodes to the surface of the object to be measured. Although this method is simple, there are many problems and limitations in practical applications, which affect the stability, accuracy, and reliability of the measurement.

[0003] For example, in industrial automation and environmental monitoring, voltage signal measurement devices need to have high anti-interference ability and stability to work properly in complex and harsh environments. The method of directly attaching electrodes is more vulnerable to electromagnetic interference and mechanical vibration in such environments, resulting in unstable measurement data and unable to meet the requirements of high-precision measurement. Oil stains, dust, etc. in the industrial environment will also affect the contact quality between the electrode and the surface of the object to be measured, further reducing the measurement accuracy and reliability. In addition, it is not easy to move the electrode again after attaching it to the surface of the object to be measured.

[0004] Therefore, designing a new type of voltage signal measurement device to overcome the shortcomings of traditional voltage signal measurement devices on the surface of objects is of great significance. Summary of the Invention

[0005] To solve the above problems, the present invention provides a negative pressure suction cup type voltage signal measurement device, including a cavity, a flexible suction cup, a conduction tube, an elastic cavity, a first annular electrode, and a second annular electrode. The edge of the flexible suction cup is fixed to the edge of the bottom of the cavity; in the natural state, the flexible suction cup is recessed into the cavity. An opening is provided at the center of the flexible suction cup, and the opening is connected to the elastic cavity through the conduction tube. The conduction tube movably penetrates through the top of the cavity. The first annular electrode and the second annular electrode are arranged outside the cavity on the flexible suction cup. The first annular electrode is located on the side close to the edge of the cavity, and the second annular electrode is located on the side close to the center of the flexible suction cup. The first annular electrode and the second annular electrode do not contact. During application, a first wire penetrates through the flexible suction cup, one end of the first wire is electrically connected to the second annular electrode, and the other end of the first wire is used for signal output. The elastic cavity is squeezed, a negative pressure is formed in the elastic cavity, the flexible suction cup adsorbs on the surface of the object to be measured, and the first annular electrode and the second annular electrode are closely attached to the surface of the object to be measured.

[0006] The present invention realizes stable contact between the electrode and the surface of the object to be measured by adopting a flexible suction cup and negative pressure adsorption technology, thereby improving the stability and accuracy of the measurement signal; at the same time, the layout of the annular electrode is used to optimize the acquisition of the voltage signal and interference shielding.

[0007] Furthermore, the material of the cavity is low-carbon steel. Low-carbon steel has a high electromagnetic field absorption capacity. The low-carbon steel material forms a good shielding shell, effectively shielding external electromagnetic interference, protecting the internal measurement signal from the influence of the external environment, and improving the accuracy and stability of the measurement.

[0008] Furthermore, the material of the conduction tube is stainless steel. Stainless steel material has high mechanical strength and hardness, can withstand large pressures and mechanical stresses, and ensures the stability and durability of the conduction tube during use. In addition, the surface of stainless steel is smooth and has a low friction coefficient, so that the conduction tube can move smoothly and reduce friction when moving; at the same time, the stainless steel conduction tube also has a small resistance to the gas flowing inside.

[0009] Furthermore, the materials of the elastic cavity and the flexible suction cup are rubber. For the flexible suction cup, rubber can closely fit various shapes and textures on the surface of the object to be measured, ensuring good contact between the electrode and the surface, and making it suitable for measurements on complex and irregular surfaces. For the elastic cavity, the rubber material has good sealing performance, can effectively form negative pressure, and enables the flexible suction cup to firmly adsorb on the surface of the object to be measured, improving the stability and durability of the adsorption.

[0010] Furthermore, the cross-section of the first annular electrode extends to the other side of the flexible suction cup. In the application, the parts of the first annular electrode on both sides of the flexible suction cup are connected through some through holes. In this way, the first annular electrode has a larger shielding area, lower resistance and inductance, can more effectively shield electromagnetic interference from the object surface, and reduce the influence of external noise on the measurement signal.

[0011] Furthermore, the material of the first annular electrode is conductive rubber, and the material of the second annular electrode is silver / silver chloride. Conductive rubber has excellent flexibility, can better fit and adapt to the shape and texture of the surface of the object to be measured, ensuring good contact and stability of the electrode; conductive rubber also has good electrical conductivity and electromagnetic shielding performance, and can effectively shield external electromagnetic interference. The silver / silver chloride electrode has a low and stable electrode potential, which is beneficial to the measurement of high-precision voltage signals; in addition, silver / silver chloride shows excellent stability in electrochemical reactions, can reduce the fluctuation of the interfacial potential, and ensure the stability and reliability of the measurement signal. In the present invention, the conductive rubber is used as the first annular electrode, mainly responsible for electromagnetic shielding; the silver / silver chloride electrode is used as the second annular electrode, focusing on the measurement of high-static voltage signals; the combination of the two materials optimizes the performance of the entire measurement system.

[0012] Furthermore, on one side close to the edge of the cavity, the thickness of the first annular electrode is small; on the side close to the center of the flexible suction cup, the thickness of the first annular electrode is large. That is to say, by designing the electrode thickness to gradually increase, a shielding effect that gradually strengthens from the edge to the center is achieved, more effectively blocking external electromagnetic interference and ensuring that the measurement signal in the central area is purer. In addition, the larger electrode thickness on the side close to the center increases the mechanical strength and stability of the electrode in the central area, ensuring good contact between the electrode and the surface of the object to be measured in the central area; at the same time, the smaller thickness on the side close to the edge makes the electrode edge softer, enabling it to better conform to and adapt to the subtle changes in the surface of the object to be measured, ensuring the contact quality of the entire electrode.

[0013] Furthermore, the top surface of the first annular electrode is wide, and the bottom surface of the first annular electrode is narrow. The design of the wide top surface increases the contact area of the electrode, enhances the support ability for the flexible suction cup and the cavity, and increases the stability of the overall structure. During application, the first annular electrode adsorbs on the surface of the object to be measured, and such a design can better block the air flowing through the cross-section between the first annular electrode and the object to be measured, enhancing the stability of the system.

[0014] Furthermore, a scale is marked on the conduction tube outside the cavity. Through the scale, the user can accurately locate the position of the conduction tube to achieve precise negative pressure regulation and the adsorption strength of the flexible suction cup. This precise control ensures the consistency of each operating condition, improving the repeatability and reliability of experiments and measurements. In addition, the scale can also help the user visually see the position of the conduction tube, reducing the blindness and uncertainty of adjustment, thereby simplifying the operation steps. This intuitive design not only reduces errors caused by human factors but also improves the accuracy and efficiency of the overall operation.

[0015] Furthermore, during application, the second wire penetrates through the flexible suction cup to connect to the first annular electrode; at the same time, the first wire penetrates through the flexible suction cup to connect to the second annular electrode. The electrical signals of the first annular electrode and the second annular electrode are collected respectively to obtain two independent signal channels. A low-noise preamplifier is used to amplify the two signals respectively to increase the signal strength and reduce the noise influence. The two signals are respectively filtered to remove high-frequency noise and unwanted frequency components to ensure the purity of the signals. The amplified and filtered signals are input into a differential amplifier to calculate the difference between the two electrode signals. The differential amplifier can effectively suppress common-mode noise, thereby enhancing the signal-to-noise ratio. By comparing the differences between the two electrode signals, the strength of the noise signal is judged. If the difference between the two electrode signals is large, it indicates that there is strong noise interference; if the difference is small, it indicates that the noise influence is weak. Combining the signals of the two electrodes, a more stable and accurate voltage signal is extracted through weighted average or other fusion algorithms. In addition, according to the result of differential processing, noise correction and compensation can also be performed on the measurement signal to improve the accuracy of the final signal.

[0016] Advantages of the present invention:

[0017] (1) Due to the negative pressure adsorption force formed by the flexible suction cup in the present invention, the electrode is in close contact with the surface of the object to be measured, avoiding measurement errors caused by poor contact.

[0018] (2) The present invention designs a double-ring electrode. The first ring electrode is located at the edge of the cavity for shielding external electromagnetic interference; the second ring electrode is located at the center of the flexible suction cup for accurately measuring voltage signals; the two cooperate with each other to improve the purity of the signal and the measurement accuracy.

[0019] (3) The cavity in the present invention weakens the influence of external dust and moisture on voltage measurement, improving the reliability of the measurement result.

[0020] (4) The structure of the present invention is relatively simple, easy to manufacture and operate. After measuring one part of the object, it is convenient to move the device to measure other parts of the object.

[0021] Considering the above advantages, the present invention has good application prospects in the technical field of voltage signal measurement. Description of the drawings

[0022] Figure 1 is a schematic diagram of a negative pressure suction cup type voltage signal measurement device.

[0023] Figure 2 is another schematic diagram of a negative pressure suction cup type voltage signal measurement device.

[0024] In the figure: 1, cavity; 2, flexible suction cup; 3, conduction tube; 4, elastic cavity; 5, first ring electrode; 6, second ring electrode. Detailed implementation manners

[0025] To make the purpose, technical solutions and advantages of the present application clearer, the following examples are given with reference to the drawings to further elaborate on the present application in detail.

[0026] The present invention provides a negative pressure suction cup type voltage signal measurement device, as Figure 1As shown, it includes a cavity 1, a flexible suction cup 2, a conduction tube 3, an elastic cavity 4, a first annular electrode 5, and a second annular electrode 6. The material of the cavity 1 is low-carbon steel. The cavity 1 is cylindrical, and its specific dimensions are designed according to actual needs and are not specifically limited here; the cavity 1 provides structural support and mechanical protection, and low-carbon steel has good electromagnetic shielding effect, which can effectively shield external electromagnetic interference and improve the accuracy of measurement. The material of the flexible suction cup 2 is rubber. The flexible suction cup 2 is circular, and the shape of the flexible suction cup 2 matches the shape of the cavity 1. The edge of the flexible suction cup 2 is fixed to the edge of the bottom of the cavity 1. In the natural state, the flexible suction cup 2 is recessed into the cavity 1. An opening is provided at the center of the flexible suction cup 2, and the opening is connected to the elastic cavity 4 through the conduction tube 3. The material of the conduction tube 3 is stainless steel. The conduction tube 3 is a cylindrical pipe, and the diameter and length of the conduction tube 3 are determined according to the specific design requirements of the device. The conduction tube 3 movably penetrates through the top of the cavity 1. A scale is marked on the conduction tube 3 outside the cavity 1. The conduction tube 3 provides an airtight channel for controlling and adjusting the negative pressure of the flexible suction cup 2 to ensure that the flexible suction cup 2 can tightly adsorb on the surface of the object to be measured; at the same time, the scale marking facilitates precise control of the position of the conduction tube 3. The material of the elastic cavity 4 is rubber. The elastic cavity 4 is a deformable cavity, and its size is adjusted according to the designs of the flexible suction cup 2 and the conduction tube 3. The elastic cavity 4 is located outside the cavity 1 for easy operation. The function of the elastic cavity 4 is to form a negative pressure. By squeezing the elastic cavity 4, a negative pressure is generated inside the flexible suction cup 2, so that the flexible suction cup 2 tightly adsorbs on the surface of the object to be measured, ensuring good contact between the electrode and the surface. The material of the first annular electrode 5 is conductive rubber. The first annular electrode 5 is arranged on the outside of the cavity 1 on the flexible suction cup 2, and the first annular electrode 5 is located on the side close to the edge of the cavity 1. The first annular electrode 5 provides electromagnetic shielding, reduces external electromagnetic interference, and improves the purity of the measurement signal. In addition, when in use, the first annular electrode 5 closely adheres to the surface of the object to be measured, and also blocks the entry of external air into the internal negative pressure area. The material of the second annular electrode 6 is silver / silver chloride. The second annular electrode 6 is also arranged on the outside of the cavity 1 on the flexible suction cup 2, and the second annular electrode 6 is located on the side close to the center of the flexible suction cup 2. The second annular electrode 6 is used to accurately measure the voltage signal on the surface of the object to be measured. The silver / silver chloride material has excellent electrical conductivity and electrochemical stability, ensuring the accuracy and reliability of signal measurement. The first annular electrode 5 and the second annular electrode 6 do not contact, and the distance between the first annular electrode 5 and the second annular electrode 6 is greater than 10 microns.

[0027] During application, the first wire passes through the flexible suction cup 2. One end of the first wire is electrically connected to the second annular electrode 6, and the other end of the first wire is used for signal output. By squeezing the elastic cavity 4, a negative pressure is formed inside the elastic cavity 4. Through the conduction tube 3, a negative pressure is also formed inside the flexible suction cup 2, and the flexible suction cup 2 adsorbs on the surface of the object to be measured. The first annular electrode 5 and the second annular electrode 6 are in close contact with the surface of the object to be measured. The original voltage signal on the surface of the object to be measured is transmitted on the first wire. After filtering, analog-to-digital conversion, and digital signal processing of the original voltage signal, the final voltage signal is obtained.

[0028] Preferably, as Figure 2 shown, the cross-section of the first annular electrode 5 extends to the other side of the flexible suction cup 2. The flexible suction cup 2 is provided with a through hole, and the first annular electrode 5 extends to the other side of the flexible suction cup 2 through the through hole, which increases the cross-sectional area and the overall volume of the first annular electrode 5, and improves the electromagnetic shielding ability of the first annular electrode 5.

[0029] Preferably, the width of the first annular electrode 5 is 10 mm. Near the edge of the cavity 1, the thickness of the first annular electrode 5 is small; near the center of the flexible suction cup 2, the thickness of the first annular electrode 5 is large. The thickness of the first annular electrode 5 near the edge of the cavity 1 is 1 mm, making the electrode more flexible in the edge area and able to better fit the minute unevenness on the surface of the object to be measured, ensuring good contact; the thickness of the first annular electrode 5 near the center of the flexible suction cup 2 is 5 mm, which can provide a stronger electromagnetic shielding effect in the center area, reduce electromagnetic interference in the center area, and improve the purity of the measurement signal. In addition, the thicker design also provides higher mechanical strength in the center area, ensuring the stability of the electrode during the adsorption process and reducing deformation or displacement caused by mechanical stress.

[0030] Preferably, the top surface of the first annular electrode 5 is wide and the bottom surface is narrow. For example, the width of the top surface of the first annular electrode 5 is 8 mm, and the width of the bottom surface is 4 mm. The height gradually increases from the edge to the center, with the edge height being 1 mm and the center height being 5 mm. During adsorption, the top surface of the first annular electrode 5 contacts the object to be measured. The wider top surface and thinner edge design make the electrode softer when contacting the object to be measured, able to better adapt to the minute unevenness on the surface, and ensure good electrical contact. Of course, the wider top surface of the first annular electrode 5 is also more conducive to shielding the noise transmitted along the object surface to the second annular electrode 6.

[0031] Preferably, during application, the second wire penetrates through the flexible suction cup 2 to connect to the second annular electrode 6. In this way, the first annular electrode signal V1(t) and the second annular electrode signal V2(t) are collected. The V1(t) and V2(t) are amplified respectively using a low-noise preamplifier, and then the amplified signals V1(t) and V2(t) are subjected to provide filtering and band-pass filtering to remove high-frequency noise and unwanted frequency components. Then, the filtered signals are input into a differential amplifier to calculate the differential signal V d (t): V d (t) = V1(t) - V2(t). By analyzing the root mean square (RMS) value of the differential signal V d (t), the strength of the noise signal is judged. The calculation method of the RMS is

[0032]

[0033] where T is the period. If the RMS value of V d (t) is large, it indicates that the noise interference is strong; if the RMS value of V d (t) is small, it indicates that the noise interference is weak. A more stable and accurate voltage signal V avg (t) is extracted through a weighted average algorithm: V avg (t) = αV1(t) + βV2(t), where α and β are weight coefficients and satisfy α + β = 1. The weight coefficients are dynamically adjusted according to the noise level of the signal, where,

[0034]

[0035]

[0036] Noise correction and compensation are performed according to the differential signal V d (t). The corrected signal V corr (t) is:

[0037] V corr (t) = V avg (t) – kV d (t),

[0038] where k is the compensation coefficient, which is adjusted according to the actual noise level and system characteristics.

[0039] In summary, the present invention provides a negative pressure suction cup type voltage signal measuring device. The advantage of this device is that through the flexible suction cup 2 and the negative pressure adsorption structure, the electrode can be more stably attached to the surface of the object to be measured, avoiding measurement errors caused by poor contact, vibration, and environmental interference in the traditional method. At the same time, the setting of the annular electrode further optimizes the signal acquisition and interference shielding effect, making the measurement result more reliable and accurate.

[0040] The flexible suction cup type voltage signal measuring device is not only applicable to medical monitoring, but also can be widely used in fields such as industrial automation, environmental monitoring, and scientific research. In medical monitoring, it can be used for high-precision measurement of bioelectric signals such as electrocardiogram, electroencephalogram, and electromyogram, improving the accuracy and reliability of diagnosis. In industrial automation, it can be used for monitoring the operating status of equipment and fault diagnosis, improving the safety and efficiency of the production process. In environmental monitoring, it can be used for monitoring parameters such as atmospheric electric field and electromagnetic radiation, providing accurate environmental data to support environmental protection.

[0041] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. A negative pressure suction cup voltage signal measuring device, comprising a cavity, a flexible suction cup, a conducting tube, an elastic cavity, a first annular electrode, and a second annular electrode, wherein the edge of the flexible suction cup is fixed to the edge of the bottom of the cavity, and in a natural state, the flexible suction cup is recessed into the cavity, and an opening is provided in the center of the flexible suction cup, and the opening is connected to the elastic cavity through the conducting tube, and the conducting tube can movably pass through the top of the cavity, and the first annular electrode and the second annular electrode are arranged on the outer side of the cavity on the flexible suction cup, and the first annular electrode is located on the side close to the edge of the cavity, and the second annular electrode is located on the side close to the center of the flexible suction cup, and the first annular electrode and the second annular electrode are not in contact; when used, a first wire passes through the flexible suction cup, one end of the first wire is electrically connected to the second annular electrode, and the other end of the first wire is used for signal output, squeezing the elastic cavity, and a negative pressure is formed in the elastic cavity, and the flexible suction cup is adsorbed on the surface of the object to be measured, and the first annular electrode and the second annular electrode are closely attached to the surface of the object to be measured, characterized in that The material of the cavity is low carbon steel, the cross section of the first annular electrode extends to the other side of the flexible suction cup, the top surface of the first annular electrode is wide, and the bottom surface of the first annular electrode is narrow.

2. The negative pressure suction cup voltage signal measuring device according to claim 1, characterized in that: The material of the conducting tube is stainless steel.

3. The negative pressure suction cup voltage signal measuring device according to claim 1, characterized in that: The elastic cavity and the flexible suction cup are made of rubber.

4. The negative pressure suction cup voltage signal measuring device according to claim 1, characterized in that: The material of the first annular electrode is conductive rubber, and the material of the second annular electrode is silver / silver chloride.

5. The negative pressure suction cup voltage signal measuring device according to claim 4, characterized in that: The first annular electrode has a smaller thickness on a side close to the edge of the cavity; and has a larger thickness on a side close to the center of the flexible suction cup.

6. The negative pressure suction cup voltage signal measuring device according to any one of claims 1 to 5, characterized in that: The conducting tube outside the cavity is marked with scale.

7. The negative pressure suction cup voltage signal measuring device according to claim 6, characterized in that: When used, a second wire is used to penetrate the flexible suction cup and connect to the first annular electrode.

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