Micro pressure sensing electrode and sensing method
By using micro-pressure sensing electrodes in pharmaceutical weighing equipment and using dielectric elastomers to detect micro-pressure, the problem of inducing in the traditional Chinese medicine solution or powder when the weight of traditional Chinese medicine is lighter is solved, and a higher accuracy and convenient measurement process is achieved.
Patent Information
- Application Number
- CN202311759505.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-20
- Publication Date
- 2025-04-04
AI Technical Summary
When existing pharmaceutical weighing equipment encounters light weight in the drug solution or powder, it cannot effectively sense the weight, resulting in inaccurate measurement and frequent adjustment of the test scale.
A micro-pressure sensing electrode is used, including a bottom plate and a pressure-receiving plate. The pressure-receiving plate is equipped with an acrylic insulated shell and a pressure-receiving mechanism. The pressure-receiving mechanism consists of an upper PCB plate, a lower PCB plate and a dielectric elastomer. The dielectric elastomer is composed of silicone rubber and copper calcium titanate and its derivatives, and is used to detect micro-pressure.
It realizes sensitive detection of microweights, improves the accuracy of drug weighing, and avoids the trouble of frequent adjustment of test weighing.
Smart Images
Figure CN119756536A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of pressure sensing technology, and more particularly to a micro pressure sensing electrode and a sensing method. Background Art
[0002] Drug weighing is one of the important links in the pharmaceutical industry. In the pharmaceutical industry, drug weighing is widely used in control, batching, and measurement. Checkweighers are used to weigh drug powders or medicines. Accurate weighing of drugs has a vital impact on production quality and patient medication. Therefore, in the drug production process, drug weight detection requires the use of high-precision checkweighers to ensure accurate weighing of drugs.
[0003] Most sensors used in pharmaceutical scales (pharmaceutical checkweighers) use springs as the middle elastic parts for support. When subjected to force, the elastic parts deform, thereby changing the capacitance between the electrodes. However, since the springs themselves have a certain supporting force, when the weight of the drug powder or drug solution is lower than the supporting force of the springs themselves, the sensors will not be able to sense the weight of the drug solution or drug powder, resulting in the staff being unable to measure the weight of the drug solution or drug powder normally, resulting in the drug being unable to be properly proportioned. Therefore, the staff need to frequently adjust different test scales for testing, which is more troublesome. Summary of the Invention
[0004] 1. Technical problems to be solved In response to the problems existing in the prior art, the purpose of the present invention is to provide a micro-pressure sensing electrode and sensing method, which aims to solve the problem in the prior art that when the pharmaceutical solution or powder is light, it is not enough to cause the spring to deform, resulting in the sensor being unable to sense the weight of the pharmaceutical solution or powder, resulting in the staff being unable to measure the weight of the pharmaceutical solution or powder normally.
[0005] 2. Technical solution In order to solve the above problems, the present invention adopts the following technical solutions: A micro-pressure sensing electrode comprises a base plate and a pressure-receiving plate, wherein the pressure-receiving plate is arranged on the upper side of the base plate, and an acrylic insulating shell is provided at the end of the pressure-receiving plate and the base plate adjacent to each other, and a pressure-sensing mechanism is provided between the two acrylic insulating shells, wherein the pressure-sensing mechanism is used for pressure detection; The pressure-sensing mechanism includes an upper PCB board, a lower PCB board, and a dielectric elastomer. The upper PCB board and the lower PCB board are respectively installed in two acrylic insulating shells, and the upper PCB board is located on the upper side of the lower PCB board. The dielectric elastomer is arranged between the upper PCB board and the lower PCB board.
[0006] As a preferred solution of the present invention, multiple mounting blocks are provided on the base plate, multiple mounting blocks are threadedly connected to the base plate with bolts, multiple mounting blocks are fixedly connected to limit blocks, and multiple limit blocks are located on the upper side of the two acrylic insulating shells corresponding to the pressure plate.
[0007] As a preferred solution of the present invention, the dielectric elastomer is composed of silicone rubber and copper calcium titanate and its derivatives, the silicone rubber material is the matrix, and the copper calcium titanate and its derivatives are used as high dielectric fillers.
[0008] A sensing method for a micro-pressure sensing electrode comprises the following steps: Step S1, external pressure: placing the object to be tested on the pressure plate. The weight of the object to be tested forms an external pressure which is transmitted to an acrylic insulating shell through the pressure plate. The two acrylic insulating shells cooperate to pressurize the pressure-sensing mechanism. Step S2, pressure sensing: the acrylic insulating shell located on the upper side transmits pressure to the dielectric elastomer through the upper PCB board, causing the dielectric elastomer to deform, thereby changing the capacitance of the dielectric elastomer; Step S3, pressure detection: After the capacitance of the dielectric elastomer changes, the upper PCB and the lower PCB detect the dielectric elastomer, and the detection result is transmitted to the sensor chip; Step S4, signal output: the sensor chip converts the detection result into an electrical signal and transmits it to the application program. The application program receives and processes the electrical signal to obtain the weight of the object to be measured.
[0009] As a preferred solution of the present invention, in step S3, the upper PCB board and the lower PCB board are respectively the GND electrode and the A electrode, and the GND electrode and the A electrode are in contact with the dielectric elastomer.
[0010] As a preferred solution of the present invention, in step S3, after the dielectric elastomer is deformed and the capacitance changes, its own dielectric constant changes, and the GND electrode and the A electrode detect the change in the dielectric constant.
[0011] As a preferred solution of the present invention, in step S4, the sensing chip reads the GND electrode and the A electrode to detect the change in dielectric constant, and samples the continuous signal of this change into a discrete signal. The discrete signal is quantized by the sensing chip and converted into a digital signal and transmitted to the application.
[0012] As a preferred solution of the present invention, in step S4, the application includes a display system and a computing system, and the digital signal quantified by the sensing chip forms a waveform through the display system.
[0013] As a preferred solution of the present invention, in the process of transmitting the digital signal quantized by the sensing chip to the display system, the conversion formula of the digital signal is: f(n)=sin(2*pi*n*Ts), and the display system draws a waveform diagram based on the digital signal converted by the conversion formula.
[0014] As a preferred solution of the present invention, the calculation system calculates the values in the waveform diagram to obtain the weight of the object to be measured in each time period, and displays the calculation results on the display system.
[0015] 3. Beneficial effects Compared with the prior art, the advantages of the present invention are: (1) In this solution, the object to be tested is placed on the pressure plate. The pressure plate is subjected to force to squeeze the dielectric elastomer, causing deformation. The deformation of the dielectric elastomer causes a change in capacitance. The upper PCB and the lower PCB detect this change. The sensor chip reads this change and quantifies it and reflects it in the application. The dielectric elastomer is composed of polymer materials. While ensuring elasticity, its supporting force is smaller than that of the spring, thereby replacing the traditional elastic part with a spring setting. In addition, the force is measured by detecting the change in capacitance of the dielectric elastomer. The force is more sensitive, so that the sensing electrode can detect micro-pressure and increase the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A top view of a micro pressure sensing electrode; Figure 2 A side cross-sectional view of a micro pressure sensing electrode; Figure 3 This is a structural diagram of the upper PCB board in a micro-pressure sensing electrode; Figure 4 This is a structural diagram of the lower PCB board in a micro-pressure sensing electrode; Figure 5 A first flow chart of a micro-pressure sensing electrode sensing method; Figure 6 A second flow chart of a micro-pressure sensing electrode sensing method; Figure 7 This is a first principle block diagram of a micro pressure sensing electrode sensing method; Figure 8 The second principle block diagram of a micro pressure sensing electrode sensing method; Figure 9 The schematic diagram of the application program in a micro pressure sensing electrode sensing method is shown in FIG. Figure 10 This is a waveform diagram of the display system in a micro pressure sensing electrode sensing method.
[0017] Description of the numbers in the figure: 1. Bottom plate; 2. Pressure plate; 3. Acrylic insulating shell; 4. Pressure sensing mechanism; 401. Upper PCB board; 402. Lower PCB board; 403. Dielectric elastomer; 5. Mounting block; 6. Bolt; 7. Limit block. DETAILED DESCRIPTION
[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.
[0019] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.
[0021] Example: See also Figure 1-4 A micro-pressure sensing electrode includes a base plate 1 and a pressure-receiving plate 2. The pressure-receiving plate 2 is arranged on the upper side of the base plate 1. An acrylic insulating shell 3 is provided at the end where the pressure-receiving plate 2 and the base plate 1 are close to each other. A pressure-sensing mechanism 4 is provided between the two acrylic insulating shells 3. The pressure-sensing mechanism 4 is used for pressure detection. The pressure-sensing mechanism 4 includes an upper PCB board 401, a lower PCB board 402 and a dielectric elastomer 403. The upper PCB board 401 and the lower PCB board 402 are respectively installed in two acrylic insulating shells 3, and the upper PCB board 401 is located on the upper side of the lower PCB board 402, and the dielectric elastomer 403 is arranged between the upper PCB board 401 and the lower PCB board 402.
[0022] In this embodiment, the pressure plate 2 and the base plate 1 are both made of insulating materials. The pressure-sensing mechanism 4 is arranged between two acrylic insulating shells 3. The two acrylic insulating shells 3 have an insulating effect, which keeps the upper PCB board 401 and the lower PCB board 402 stable during use and protects the entire pressure-sensing mechanism 4. The dielectric elastomer 403 is a capacitance signal generating material. When detecting the weight of the object to be measured, the object to be measured is placed on the pressure plate 2. The pressure on the pressure plate 2 causes the dielectric elastomer 403 to be squeezed, thereby changing the shape of the dielectric elastomer 403 and causing the capacitance of the dielectric elastomer 403 to change. The upper PCB board 401 and the lower PCB board 402 detect the change in capacitance, read this change through the sensing chip, quantify this change, and reflect it in the application, thereby obtaining the weight of the object to be measured.
[0023] Specifically, a plurality of mounting blocks 5 are provided on the base plate 1, and bolts 6 are threadedly connected between the plurality of mounting blocks 5 and the base plate 1. Limiting blocks 7 are fixedly connected to the plurality of mounting blocks 5, and the plurality of limiting blocks 7 are located on the upper side of the two acrylic insulating shells 3 corresponding to the pressure plate 2.
[0024] In this embodiment, multiple mounting blocks 5 are installed on the base plate 1 by multiple bolts 6, so that multiple limit blocks 7 correspond to the pressure sensing mechanism 4 and the pressure plate 2. The multiple limit blocks 7 stabilize the pressure sensing mechanism 4 and the pressure plate 2 on the base plate 1 for use.
[0025] Specifically, the dielectric elastomer 403 is composed of silicone rubber and copper calcium titanate and its derivatives, with the silicone rubber serving as a matrix and the copper calcium titanate and its derivatives serving as high dielectric fillers.
[0026] In this embodiment, the dielectric elastomer 403 is made of silicone rubber, copper calcium titanate and its derivatives, has good elasticity, and can quickly recover to a state and size close to its original state after stress relaxation.
[0027] See also Figure 1-8 , a sensing method of a micro pressure sensing electrode, comprising the following steps: Step S1, external pressure: The object to be tested is placed on the pressure plate 2. The weight of the object to be tested forms an external pressure which is transmitted to an acrylic insulating shell 3 through the pressure plate 2. The two acrylic insulating shells 3 cooperate to pressurize the pressure-sensing mechanism 4. Step S2, pressure sensing: the acrylic insulating shell 3 located on the upper side transmits pressure to the dielectric elastomer 403 through the upper PCB board 401, causing the dielectric elastomer 403 to deform, thereby changing the capacitance of the dielectric elastomer 403; Step S3, pressure detection: After the capacitance of the dielectric elastomer 403 changes, the upper PCB 401 and the lower PCB 402 detect the dielectric elastomer 403, and the detection result is transmitted to the sensor chip; Step S4, signal output: The sensor chip converts the detection result into an electrical signal and transmits it to the application program. The application program receives and processes the electrical signal to obtain the weight of the object to be measured.
[0028] Specifically, in step S3 , the upper PCB board 401 and the lower PCB board 402 are respectively the GND electrode and the A electrode, and the GND electrode and the A electrode are in contact with the dielectric elastomer 403 .
[0029] Specifically, in step S3, after the dielectric elastomer 403 is deformed and the capacitance changes, its own dielectric constant changes, and the GND electrode and the A electrode detect the change in the dielectric constant.
[0030] Specifically, in step S4, the sensing chip reads the GND electrode and the A electrode to detect the change in dielectric constant, and samples the continuous signal of this change into a discrete signal. The discrete signal is quantized by the sensing chip and converted into a digital signal and transmitted to the application.
[0031] Specifically, in step S4, the application includes a display system and a computing system, and the digital signal quantized by the sensing chip forms a waveform through the display system.
[0032] Specifically, when the digital signal quantized by the sensing chip is transmitted to the display system, the conversion formula of the digital signal is: f(n)=sin(2*pi*n*Ts), and the display system draws a waveform diagram based on the digital signal converted by the conversion formula.
[0033] Specifically, the calculation system calculates the values in the waveform diagram to obtain the weight of the object to be measured in each time period, and displays the calculation results on the display system.
[0034] Working principle: The object to be measured is placed on the pressure plate 2. The weight of the object to be measured forms an external pressure, which is transmitted to an acrylic insulating shell 3 through the pressure plate 2. The two acrylic insulating shells 3 cooperate to pressurize the pressure-sensing mechanism 4. The acrylic insulating shell 3 on the upper side transmits the pressure to the dielectric elastomer 403 through the upper PCB board 401, causing the dielectric elastomer 403 to deform, thereby changing the capacitance of the dielectric elastomer 403 and its own dielectric constant. The upper PCB board 401 and the lower PCB board 402 detect the dielectric elastomer 403 through the GND electrode and the A electrode, and the detection result is transmitted to the sensing chip. The sensing chip reads the GND electrode and the A electrode to detect the change in the dielectric constant and samples the continuous signal of this change into a discrete signal. The discrete signal is quantized by the sensing chip and converted into a digital signal and transmitted to the application. The computing system calculates the digital signal quantized by the sensing chip to obtain the weight of the object to be measured and displays the calculation result in the application.
[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, and these should be covered by the scope of protection of the present invention.
Claims
1. A micro pressure sensing electrode, comprising a base plate (1) and a pressure receiving plate (2), characterized in that: The pressure-receiving plate (2) is arranged on the upper side of the bottom plate (1), and an acrylic insulating shell (3) is arranged at the end of the pressure-receiving plate (2) and the bottom plate (1) that are close to each other, and a pressure sensing mechanism (4) is arranged between the two acrylic insulating shells (3), and the pressure sensing mechanism (4) is used for pressure detection; The pressure sensing mechanism (4) comprises an upper PCB board (401), a lower PCB board (402) and a dielectric elastomer (403); the upper PCB board (401) and the lower PCB board (402) are respectively installed in two acrylic insulating shells (3), and the upper PCB board (401) is located on the upper side of the lower PCB board (402); and the dielectric elastomer (403) is arranged between the upper PCB board (401) and the lower PCB board (402).
2. A micro pressure sensing electrode according to claim 1, characterized in that: A plurality of mounting blocks (5) are arranged on the bottom plate (1), and bolts (6) are threadedly connected between the plurality of mounting blocks (5) and the bottom plate (1). A limiting block (7) is fixedly connected to the plurality of mounting blocks (5), and the plurality of limiting blocks (7) are located on the upper sides of the two acrylic insulating shells (3) and correspond to the pressure plate (2).
3. A micro pressure sensing electrode according to claim 2, characterized in that: The dielectric elastomer (403) is composed of silicone rubber and copper calcium titanate and its derivatives, the silicone rubber material is a matrix, and the copper calcium titanate and its derivatives are used as high dielectric fillers.
4. A sensing method of a micro pressure sensing electrode according to claims 1-3, characterized in that: The following steps are involved: Step S1, external pressure: the object to be tested is placed on the pressure plate (2), and the weight of the object to be tested forms an external pressure which is transmitted to an acrylic insulating shell (3) through the pressure plate (2), and the two acrylic insulating shells (3) cooperate to pressurize the pressure sensing mechanism (4); Step S2, pressure sensing: the acrylic insulating shell (3) located on the upper side transmits pressure to the dielectric elastomer (403) through the upper PCB board (401), causing the dielectric elastomer (403) to deform, thereby causing the capacitance of the dielectric elastomer (403) to change; Step S3, pressure detection: after the capacitance of the dielectric elastomer (403) changes, the upper PCB board (401) and the lower PCB board (402) detect the dielectric elastomer (403), and the detection result is transmitted to the sensing chip; Step S4, signal output: the sensing chip converts the detection result into an electrical signal and transmits it to the application program, and the application program receives and processes the electrical signal to obtain the weight of the object to be measured.
5. The sensing method of a micro pressure sensing electrode according to claim 4, characterized in that: In step S3, the upper PCB board (401) and the lower PCB board (402) are respectively a GND electrode and an A electrode, and the GND electrode and the A electrode are in contact with the dielectric elastomer (403).
6. The sensing method of a micro pressure sensing electrode according to claim 5, characterized in that: In step S3, after the dielectric elastomer (403) is deformed and the capacitance changes, its own dielectric constant changes, and the GND electrode and the A electrode detect the change in the dielectric constant.
7. The sensing method of a micro pressure sensing electrode according to claim 6, characterized in that: In step S4, the sensing chip reads the GND electrode and the A electrode to detect the change in dielectric constant, and samples the continuous signal of the change into a discrete signal. The discrete signal is quantized by the sensing chip and converted into a digital signal for transmission to the application.
8. The sensing method of a micro pressure sensing electrode according to claim 7, characterized in that: In step S4, the application includes a display system and a computing system, and the digital signal quantified by the sensing chip forms a waveform through the display system.
9. The sensing method of a micro pressure sensing electrode according to claim 8, characterized in that: When the digital signal quantified by the sensing chip is transmitted to the display system, the conversion formula of the digital signal is: f(n)=sin(2*pi*n*Ts), and the display system draws a waveform diagram according to the digital signal converted by the conversion formula.
10. The sensing method of a micro pressure sensing electrode according to claim 9, characterized in that: The calculation system calculates the value in the waveform diagram to obtain the weight of the object to be tested in each time period, and displays the calculation result on the display system.