Liquid level detection device and system based on weighing platform

Abstract

The utility model discloses a liquid level detection device and system based on a weighing platform, and relates to the technical field of liquid level detection, the device comprises a container load-bearing bottom plate, the top of the container load-bearing bottom plate is connected with a container load-bearing upper cover, and the container load-bearing upper cover is used for placing a container to be detected; the pressure sensors are arranged between the container bearing bottom plate and the container bearing upper cover, the four pressure sensors are evenly arranged in the circumferential direction of the container bearing bottom plate, and the four pressure sensors are externally connected with a data collecting and processing module. According to the liquid level detection device and system based on the weighing platform, the measurement precision can be improved, and the liquid level in the container to be measured can be measured in real time.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid level detection technical field, in particular to a kind of liquid level detection device and system based on weighing platform. BACKGROUND

[0002] Some solution preparation device needs to detect the liquid level in the water tank matched when using;The liquid level detection device understood by the inventor is all through measuring the position of liquid surface to realize the measurement of the liquid level in water tank, and measurement precision is lower, and cannot be measured in real time.Therefore, it is urgent to design a kind of technical scheme which can improve measurement precision, and can measure liquid level in real time. UTILITY MODEL CONTENT

[0003] The utility model aims at providing a kind of liquid level detection device and system based on weighing platform, can improve measurement precision, and can measure the liquid level in the container to be measured in real time.

[0004] To achieve the above object, the utility model provides the following scheme:

[0005] First, the utility model provides a kind of liquid level detection device based on weighing platform, comprising:

[0006] Weighing platform, the weighing platform includes container bearing bottom plate and container bearing upper cover, the container bearing upper cover is used to place the container to be measured on;

[0007] Pressure sensor is arranged between the container bearing bottom plate and container bearing upper cover, and four pressure sensors are evenly arranged along the circumference of the container bearing bottom plate, and the four pressure sensors are connected with data acquisition and processing module.

[0008] Optionally, the pressure sensor is respectively first pressure sensor, second pressure sensor, third pressure sensor and fourth pressure sensor;The first pressure sensor includes first resistance strain gauge, the second pressure sensor includes second resistance strain gauge, the third pressure sensor includes third resistance strain gauge, the fourth pressure sensor includes fourth resistance strain gauge, the first resistance strain gauge, second resistance strain gauge, third resistance strain gauge and fourth resistance strain gauge are sequentially connected to form Wheatstone bridge, and are connected with the data acquisition and processing module respectively.

[0009] Optionally, the first pressure sensor further includes bearing piece upper cover and bearing piece bottom plate, the bearing piece upper cover and bearing piece bottom plate can be fixedly buckled connection, the first resistance strain gauge is fixedly attached between the bearing piece upper cover and bearing piece bottom plate;The second pressure sensor, third pressure sensor, fourth pressure sensor are all same as the structure of the first pressure sensor.

[0010] Optionally, four load-bearing piece grooves are arranged equidistantly on the circumferential direction of the container load-bearing bottom plate, and one pressure sensor is fixedly arranged in each load-bearing piece groove.

[0011] Optionally, a threaded fixing hole is arranged on one side of the load-bearing piece groove, and a connecting positioning part is arranged on both ends of the load-bearing piece upper cover, and a positioning hole is arranged in the positioning part, and the positioning hole is fixedly connected with the threaded fixing hole on one side of the load-bearing piece groove through a bolt.

[0012] Optionally, a plurality of container load-bearing bottom plate supporting legs are fixedly arranged on the outer bottom of the container load-bearing bottom plate.

[0013] Optionally, a container load-bearing upper cover fixing groove is arranged at the center position of the container load-bearing upper cover, and the container load-bearing upper cover fixing groove is used for placing a container to be measured.

[0014] In a second aspect, the utility model provides a kind of liquid level detection system based on weighing platform, including data acquisition and processing module, microprocessor and power module;The data acquisition and processing module are respectively connected with the microprocessor and the first resistance strain gauge, the second resistance strain gauge, the third resistance strain gauge and the fourth resistance strain gauge in the above liquid level detection device based on weighing platform;The power module is connected with the microprocessor;

[0015] The data acquisition and processing module are used to collect the resistance change signal of the first resistance strain gauge, the second resistance strain gauge, the third resistance strain gauge and the fourth resistance strain gauge, and the resistance change signal is amplified and analog-digital conversion processed, to obtain the processed resistance change signal;

[0016] The microprocessor is used to determine the liquid level inside the container to be measured according to the processed resistance change signal;

[0017] The power module is used to power the microprocessor.

[0018] Optionally, the data acquisition and processing module includes a differential amplifier and an A / D converter;

[0019] The differential amplifier is used to amplify the resistance change signal to obtain the amplified resistance change signal;

[0020] The A / D converter is used to analog-digital conversion process the amplified resistance change signal to obtain the processed resistance change signal.

[0021] Optionally, the data acquisition and processing module is HX711 chip.

[0022] According to the specific embodiment provided by the utility model, the utility model has the following technical effects:

[0023] The utility model provides a kind of liquid level detection device and system based on weighing platform, four pressure sensors are symmetrically arranged by circumference, the weight of container and its liquid can be measured in real time, after subtracting the weight of empty container itself, the weight of liquid can be obtained, liquid is taken water as example, under the condition of standard atmospheric pressure and 4 ℃, the density of water is about 1 gram / milliliter, which means that 1 milliliter of water weighs about 1 gram. Therefore, milliliter and gram can be exchanged in the measurement of water, the cross-sectional dimension of container is known, based on this, the weight of water in container can be converted into liquid level by data acquisition and processing module, this detection method does not need to be directly contacted with liquid medium, and it is sensitive and can continuously test liquid level in container. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0025] Figure 1 A structural schematic diagram of a liquid level detection device based on a weighing platform provided by an embodiment of the utility model is shown in the figure.

[0026] Figure 2 An exploded view of the liquid level detection device based on the weighing platform is shown in the figure. Figure 1

[0027] Figure 3 A structural schematic diagram of a container load-bearing bottom plate provided by an embodiment of the utility model is shown in the figure.

[0028] Figure 4 A structural schematic diagram of a container load-bearing upper cover provided by an embodiment of the utility model is shown in the figure.

[0029] Figure 5 A structural schematic diagram of a first pressure sensor provided by an embodiment of the utility model is shown in the figure.

[0030] Figure 6 An exploded view of the first pressure sensor is shown in the figure. Figure 5

[0031] A structural block diagram of a liquid level detection system based on a weighing platform provided by an embodiment of the utility model is shown in the figure. Figure 7

[0032] A circuit schematic diagram of the liquid level detection system based on the weighing platform provided by an embodiment of the utility model is shown in the figure. Figure 8

[0033] ​​In the figure: 1 - load bearing recess, 2 - threaded fixing hole, 3 - container load bearing upper cover fixing groove, 4 - load bearing upper cover, 5 - first resistance strain gauge, 6 - load bearing bottom plate, 7 - second resistance strain gauge, 8 - third resistance strain gauge, 9 - fourth resistance strain gauge, 10 - container load bearing bottom plate, 11 - container load bearing bottom plate support leg, 12 - container load bearing upper cover. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be described in further detail below with reference to the drawings and specific embodiments.

[0036] In one exemplary embodiment, as shown in Figures 1-6 A liquid level detection device based on a weighing platform is provided, which comprises a container load bearing bottom plate 10 and a pressure sensor. The container load bearing bottom plate 10 is connected with a container load bearing upper cover 12 at the top, and the container load bearing upper cover 12 is used for placing a container to be measured. The pressure sensor is arranged between the container load bearing bottom plate 10 and the container load bearing upper cover 12, and four pressure sensors are arranged uniformly along the circumference of the container load bearing bottom plate 10. The four pressure sensors are connected with a data acquisition and processing module. A plurality of container load bearing bottom plate support legs 11 are fixed to the outer bottom of the container load bearing bottom plate 10, thereby playing a stable supporting role for the whole device. A container load bearing upper cover fixing groove 3 is arranged at the center position of the container load bearing upper cover 12, and the container load bearing upper cover fixing groove 3 is used for placing the container to be measured, so that the relative positions of the container and the four pressure sensors are symmetrical, and the container to be measured can be fixed, thereby facilitating measurement of the weight of the solution in the container according to the four pressure sensors, and then determining the liquid level in the container according to the conversion relationship between the weight and the volume of the solution.

[0037] In order to realize more accurate real-time monitoring, and facilitate the collection of data, so the four pressure sensors of the embodiment are respectively first pressure sensor, second pressure sensor, third pressure sensor and fourth pressure sensor; the first pressure sensor comprises a first resistance strain gauge 5, the second pressure sensor comprises a second resistance strain gauge 7, the third pressure sensor comprises a third resistance strain gauge 8, and the fourth pressure sensor comprises a fourth resistance strain gauge 9, the first resistance strain gauge 5, the second resistance strain gauge 7, the third resistance strain gauge 8 and the fourth resistance strain gauge 9 are connected in sequence to form a Wheatstone bridge, and are connected with a data acquisition and processing module; after placing the container to be measured on the container load upper cover, elastic deformation is generated under the action of external force, so that the four resistance strain gauges pasted on the surface also deform, after the deformation of the resistance strain gauge, the resistance value will change (increase or decrease), then the resistance change is converted into an electric signal (voltage or current) through the corresponding measurement circuit, thereby completing the process of converting external force into electric signal, and then the function of real-time measuring the weight of the liquid in the container can be realized, according to the cross-sectional size of the container, and under the condition of standard atmospheric pressure and 4℃, the density of water is about 1g / ml, and then the water is converted between milliliter and gram, and finally the liquid level of water in the container is obtained. This detection method does not need to be in direct contact with the liquid medium, and can continuously test the liquid level in the container.

[0038] In order to better install and arrange the resistance strain gauge, the pressure sensor structure of the embodiment further comprises a load upper cover 4 and a load bottom plate 6 with a circular cross-section structure, the load upper cover 4 and the load bottom plate 6 can be fixedly connected, the first resistance strain gauge 5, the second resistance strain gauge 7, the third resistance strain gauge 8 and the fourth resistance strain gauge 9 are respectively fixedly attached between the load upper cover 4 and the load bottom plate 6 of the respective sensor. Four load recesses 1 are arranged on the container load bottom plate 10 at equal intervals in the circumferential direction, and one pressure sensor is fixedly arranged in each load recess 1. In order to realize the fixation of the pressure sensor, a threaded fixing hole 2 is arranged on one side of the load recess 1, and the load upper cover 4 is provided with a connecting positioning part at both ends, the positioning part is provided with a positioning hole, and the positioning hole and the threaded fixing hole 2 on one side of the load recess 1 are fixedly connected through a bolt. The load upper cover 4 and the load bottom plate 6 are connected with the corresponding resistance strain gauges above and below, and are combined into a load, i.e. a pressure sensor.

[0039] In one exemplary embodiment, the utility model provides a kind of liquid level detection system based on weighing platform, including data acquisition and processing module, microprocessor and power module;The data acquisition and processing module are connected with the microprocessor and the first resistance strain gauge 5, second resistance strain gauge 7, third resistance strain gauge 8 and fourth resistance strain gauge 9 in the above liquid level detection device based on weighing platform respectively;The power module is connected with the microprocessor.The data acquisition and processing module is HX711 chip.

[0040] The data acquisition and processing module is used to collect the resistance change signal of the first resistance strain gauge 5, the second resistance strain gauge 7, the third resistance strain gauge 8 and the fourth resistance strain gauge 9, and to amplify and analog-digital conversion process the resistance change signal, to obtain the processed resistance change signal.

[0041] As an optional implementation, the data acquisition and processing module includes a differential amplifier and an A / D converter.

[0042] The differential amplifier is used to amplify the resistance change signal to obtain the amplified resistance change signal.

[0043] The A / D converter is used to analog-digital conversion process the amplified resistance change signal to obtain the processed resistance change signal.

[0044] The microprocessor is used to determine the liquid level inside the container to be measured according to the processed resistance change signal.

[0045] The power module is used to power the microprocessor.

[0046] In this embodiment, as Figure 7 and Figure 8As shown, the system architecture of the liquid level detection system based on the weighing platform includes a microprocessor, a power module, and a data acquisition and processing module. The microprocessor is connected to the power module, and the pressure monitoring module is connected to the microprocessor through the data acquisition and processing module (HX711 chip). The microprocessor uses a chip STM32-G030, and the pressure monitoring module uses 4 groups of resistance strain gauge type pressure sensors. The 4 groups of pressure sensors are assembled to form a load-bearing block. The sensor wires are connected to each other in pairs to form a bridge circuit. The signal line is led out and connected to the HX711 chip. Among them, E+ and E- are the positive and negative electrodes of the power supply, A+ and A- are the signal inputs, the amplified signal is processed by the 24-bit A / D converter, and the output is output through the Dout pin. The SCK pin is used to synchronize the output data of the converter through the clock signal. Through amplification and digitization of the input signal, preliminary weight data is obtained. The preliminary collected data (X in the following formula) is converted into the actual weight (Y in the following formula) through the fitting formula in the program. The fitting formula is calculated by fitting the collected weight data with the actual weight of the weight at multiple points. The measurement range is 0-160KG, and the determination coefficient is 0.999. The formula is:

[0047] Y = 0.4637 * X - 1.4465.

[0048] Among them, X is the processed resistance change signal; Y is the actual weight.

[0049] After the system is powered on, it is initialized, the stored peeling value is read from the FLASH, the zero point correction is completed, the microprocessor sends a weight collection instruction to the pressure sensor, and after the weight value is collected, the initial data collected is corrected by the fitting formula to output the actual weight data. Take water as an example to illustrate that under the condition of standard atmospheric pressure and 4℃, the density of water is 1g / ml, which means that 1ml of water weighs 1g. Therefore, milliliter and gram can be interchanged in the measurement of water. Therefore, the obtained weight can be directly regarded as the water volume of water, and then converted to the liquid level in the container (water volume / maximum volume*100%) according to the volume of the container and uploaded.

[0050] The liquid level detection mode based on the weighing platform adopts resistance strain gauges as collectors, and the elastic body (elastic element, sensitive beam) produces elastic deformation under external force, so that the resistance strain gauges (conversion elements) pasted on the surface thereof also produce deformation, after the resistance strain gauges are deformed, the resistance value thereof will change (increase or decrease), then the resistance change is converted into an electric signal (voltage or current) through a corresponding measurement circuit, so that the process of converting external force into an electric signal is completed.

[0051] The technical features of the above embodiments can be combined in any manner, and to make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present application.

[0052] The principles and implementation modes of the present application are described by applying specific examples herein, and the above embodiment is only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, the specific implementation modes and application ranges will be changed according to the idea of the present application. In conclusion, the content of the present application should not be understood as a limitation.

Claims

1. A liquid level detection device based on a weighing platform, characterized in that, include: A weighing platform, comprising a container load-bearing base plate and a container load-bearing top cover, wherein the container load-bearing top cover is used to place the container to be tested; A pressure sensor is arranged between the container's load-bearing bottom plate and the container's load-bearing top cover, and four pressure sensors are evenly arranged along the circumference of the container's load-bearing bottom plate. The four pressure sensors are connected to an external data acquisition and processing module.

2. The liquid level detection device based on a weighing platform according to claim 1, characterized in that, The pressure sensors are a first pressure sensor, a second pressure sensor, a third pressure sensor, and a fourth pressure sensor; the first pressure sensor includes a first resistance strain gauge, the second pressure sensor includes a second resistance strain gauge, the third pressure sensor includes a third resistance strain gauge, and the fourth pressure sensor includes a fourth resistance strain gauge. The first, second, third, and fourth resistance strain gauges are connected in sequence to form a Wheatstone bridge and are respectively connected to the data acquisition and processing module.

3. The liquid level detection device based on a weighing platform according to claim 2, characterized in that, The first pressure sensor also includes a load-bearing upper cover and a load-bearing base plate, which can be fixedly fastened together, and the first resistance strain gauge is fixedly attached between the load-bearing upper cover and the load-bearing base plate; the second pressure sensor, the third pressure sensor, and the fourth pressure sensor all have the same structure as the first pressure sensor.

4. The liquid level detection device based on a weighing platform according to claim 3, characterized in that, The container's load-bearing base plate has four load-bearing grooves arranged at equal intervals along its circumference, and each load-bearing groove contains a fixed pressure sensor.

5. The liquid level detection device based on a weighing platform according to claim 4, characterized in that, The load-bearing component has a threaded fixing hole on one side of the groove, and the load-bearing component has a connecting positioning part at both ends. The positioning part has a positioning hole, and the positioning hole is fixedly connected to the threaded fixing hole on the side of the groove of the load-bearing component by bolts.

6. The liquid level detection device based on a weighing platform according to claim 1, characterized in that, The outer bottom of the container load-bearing base plate is fixedly provided with multiple container load-bearing base plate support legs.

7. The liquid level detection device based on a weighing platform according to claim 1, characterized in that, The container load-bearing top cover has a container load-bearing top cover fixing groove at its center position, and the container to be tested is placed in the container load-bearing top cover fixing groove.

8. A liquid level detection system based on a weighing platform, characterized in that, It includes a data acquisition and processing module, a microprocessor, and a power supply module; the data acquisition and processing module is connected to the microprocessor and the first, second, third, and fourth resistance strain gauges in the liquid level detection device based on the weighing platform according to any one of claims 1-7; the power supply module is connected to the microprocessor. The data acquisition and processing module is used to acquire the resistance change signals of the first resistance strain gauge, the second resistance strain gauge, the third resistance strain gauge and the fourth resistance strain gauge, and to amplify and perform analog-to-digital conversion on the resistance change signals to obtain the processed resistance change signals. The microprocessor is used to determine the liquid level inside the container under test based on the processed resistance change signal. The power module is used to supply power to the microprocessor.

9. The liquid level detection system based on a weighing platform according to claim 8, characterized in that, The data acquisition and processing module includes a differential amplifier and an A / D converter; The differential amplifier is used to amplify the resistance change signal to obtain an amplified resistance change signal. The A / D converter is used to perform analog-to-digital conversion on the amplified resistance change signal to obtain the processed resistance change signal.

10. The liquid level detection system based on a weighing platform according to claim 8, characterized in that, The data acquisition and processing module is an HX711 chip.

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