Weighing apparatus digital modeling calibration method and device for improving metering precision

Abstract

The invention provides a weighing apparatus digital modeling calibration method and device for improving metering precision, and relates to the technical field of metering calibration. The method comprises the steps that the bypass metering calibration system constructs an analog electronic ruler, the weighing apparatus generates a voltage signal according to a calibration object, the bypass metering calibration system converts the voltage signal into calibration data according to the analog electronic ruler to obtain multiple calibration data and calculate multiple slopes, and the weighing apparatus generates a voltage signal according to a weight and displays a weighing indicating value. The bypass metering calibration system converts the voltage signal into an evaluation value according to an analog electronic ruler, matches the evaluation value with a plurality of slopes so as to calculate an analog indicating value, optimizes a weighing indicating value into a weighing indicating value before integration, calculates an error with the analog indicating value, and judges whether the weighing apparatus needs to be optimized according to the error. A high-precision weight value is converted by using an analog electronic ruler during metering calibration, so that the measurement precision of the weighing apparatus is effectively improved, the error of the weighing apparatus is corrected, and the weighing result is more accurate.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of metrological calibration, and particularly relates to a digital modeling calibration method and device for a weighing scale to improve metrological accuracy. Background Art

[0002] Due to the influence of factors such as service time, service environment, and usage frequency, the accuracy of weighing scales often deviates, resulting in inaccurate measurement results. Weighing scale calibration refers to comparing with a metrological standard to evaluate the indication error of the weighing scale and ensure the accuracy of weighing scale measurement. However, the calibration accuracy of the current weighing scale calibration technology is the same as the measurement accuracy of the weighing scale, and it cannot calculate a high-precision indication error to reflect the small errors existing in the weighing scale, thus affecting the weighing results of materials during the production process and leading to a reduction in product production efficiency and quality. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a digital modeling calibration method and device for a weighing scale to improve metrological accuracy in view of the deficiencies of the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] A digital modeling calibration method for a weighing scale to improve metrological accuracy includes the following steps:

[0006] The bypass metrological calibration system constructs a simulated electronic ruler according to the imported device parameters of the weighing scale.

[0007] Collect calibration data of multiple calibration weights of different weights. Among them, the process of collecting calibration data is as follows: The weighing scale generates a voltage signal for calibration according to the loaded calibration weight of any weight, and the bypass metrological calibration system calculates the voltage signal for calibration according to the simulated electronic ruler to obtain calibration data; after multiple processes of collecting calibration data, multiple calibration data are obtained.

[0008] The bypass metrological calibration system calculates multiple slopes according to the multiple calibration data and divides slope intervals corresponding to the multiple calibration data.

[0009] The weighing scale generates a voltage signal for evaluation according to the loaded evaluation weight and converts it to obtain a weighing indication value. The bypass metrological calibration system calculates the voltage signal for evaluation according to the simulated electronic ruler to obtain an evaluation value, matches the evaluation value with the slope interval to obtain a matching slope, and calculates the evaluation weight according to the matching slope to obtain a simulated indication value.

[0010] The bypass metering calibration system optimizes the weighing indication value to obtain the weighing indication value before rounding, calculates the error between the weighing indication value before rounding and the analog indication value, and determines whether the error is greater than the set error threshold. If so, it determines that the weighing scale is faulty and performs optimization.

[0011] Another technical solution of the present invention to solve the above technical problems is as follows:

[0012] A digital modeling calibration device for a weighing scale to improve metering accuracy, comprising: a weighing scale and a bypass metering calibration system, the bypass metering calibration system includes a calibration acquisition module, a calibration calculation module, a calibration calculation module, and a calibration judgment module;

[0013] The weighing scale is used to generate a voltage signal for calibration according to a calibration object with any loaded weight;

[0014] The calibration acquisition module is used to construct an analog electronic scale according to the device parameters of the imported weighing scale, calculate the voltage signal for calibration according to the analog electronic scale, and obtain calibration data;

[0015] The calibration calculation module is used to calculate multiple slopes according to multiple pieces of the calibration data and divide slope intervals corresponding to multiple pieces of the calibration data;

[0016] The weighing scale is further used to generate a voltage signal for evaluation according to an evaluation weight loaded on the weighing scale, and convert the voltage signal for evaluation to obtain a weighing indication value;

[0017] The calibration calculation module is used to calculate an evaluation value according to the analog electronic scale for the voltage signal for evaluation, match the evaluation value with the slope interval to obtain a matching slope, and calculate the evaluation weight according to the matching slope to obtain an analog indication value;

[0018] The calibration judgment module is used to optimize the weighing indication value to obtain the weighing indication value before rounding, calculate the error between the weighing indication value before rounding and the analog indication value, and determine whether the error is greater than the set error threshold. If so, it determines that the weighing scale is faulty and performs optimization.

[0019] The beneficial effects of the present invention are: by constructing an analog electronic scale according to the device parameters of the weighing scale, realizing the modeling of each weighing value in the range of the weighing scale, and converting the weighed voltage signal into a high-precision weight value according to the analog electronic scale. Through multiple calibrations of the weighing scale, and the bypass metering calibration system repeatedly converts the calibrated voltage signal into a high-precision weight value, and then calculates the slope of the weighing scale in each calibration range based on multiple weight values. Use the evaluation weight to evaluate the weighing scale, calculate the analog indication value according to the slope established by calibration, and calculate the error from the display indication value of the weighing scale to determine whether the weighing scale is faulty.

[0020] By using the constructed analog electronic scale during metrological calibration testing to convert high-precision weight values, the measurement accuracy of weighing scales is effectively improved, weighing errors of weighing scales are discovered and corrected, making weighing results more accurate. High-precision metrological calibration can help enterprises more accurately control key parameters in the production process, ensure the stability and consistency of product performance, not only contribute to improving product quality but also reduce the defective product rate. Using digital calibration prevents cheating during manual calibration and supports more enterprises with special requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flowchart of a digital modeling calibration method for a weighing scale to improve metrological accuracy provided by an embodiment of the present invention;

[0022] Figure 2 It is a block diagram of a bypass metrological calibration system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0024] The weighing scale adopted by the present invention is a filling scale, which mainly includes a tank for storing materials and a plurality of strain sensors distributed and connected to the bottom of the tank. The filling scale can be divided into a liquid filling scale, a solid filling scale, and a gas filling scale. The liquid filling scale is mainly used to measure the weight of liquid cans such as water, beverages, and wine; the solid filling scale is used to measure the weight of solid cans such as rice, flour, and coal; the gas filling scale is mainly used to measure the weight of gas cans such as liquefied petroleum gas, natural gas, ammonia, and oxygen.

[0025] As Figure 1 shown, a digital modeling calibration method for a weighing scale to improve metrological accuracy provided by an embodiment of the present invention includes the following steps:

[0026] The bypass metrological calibration system constructs an analog electronic scale according to the imported device parameters of the weighing scale;

[0027] Collect calibration data of multiple calibration objects with different weights. Among them, the process of collecting calibration data is as follows: The weighing scale generates a voltage signal for calibration according to the loaded calibration object with any weight, and the bypass metrological calibration system calculates the voltage signal for calibration according to the analog electronic scale to obtain calibration data; After multiple processes of collecting calibration data, multiple calibration data are obtained;

[0028] The bypass metrological calibration system calculates multiple slopes according to multiple pieces of the calibration data and divides slope intervals corresponding to multiple pieces of the calibration data;

[0029] The weighing scale generates a voltage signal for evaluation based on the loaded evaluation weights, and converts the weighing indication value according to the voltage signal for evaluation. The bypass metering calibration system calculates the voltage signal for evaluation according to the analog electronic scale to obtain an evaluation value, matches the evaluation value with the slope interval to obtain a matching slope, and calculates the evaluation weights according to the matching slope to obtain an analog indication value;

[0030] The bypass metering calibration system optimizes the weighing indication value to obtain the weighing indication value before rounding, calculates the error between the weighing indication value before rounding and the analog indication value, and determines whether the error is greater than the set error threshold. If so, it determines that the weighing scale is faulty and performs optimization.

[0031] In the embodiment of the present invention, by constructing an analog electronic scale according to the device parameters of the weighing scale, the modeling of each weighing value in the range of the weighing scale is realized, and the voltage signal obtained by weighing is converted into a high-precision weight value according to the analog electronic scale. Through multiple calibrations of the weighing scale, and the bypass metering calibration system repeatedly converts the calibrated voltage signal into a high-precision weight value, and then calculates the slope of the weighing scale in each calibration range based on multiple weight values. Use the evaluation weights to evaluate the weighing scale, calculate the analog indication value according to the slope established by calibration, and calculate the error from the display indication value of the weighing scale to determine whether the weighing scale is faulty. That is, through digital modeling, the quality digital traceability, calibration application, and anti-cheating function of large-quality standard weights can be solved.

[0032] Preferably, the weighing scale includes a strain gauge sensor; the bypass metering calibration system constructs an analog electronic scale according to the imported device parameters of the weighing scale, including:

[0033] The bypass metering calibration system multiplies the sensitivity and excitation voltage of the imported strain gauge sensor to obtain the first maximum output voltage, and calculates the ratio of the first maximum output voltage to the graduation number of the strain gauge sensor to obtain the analog electronic scale.

[0034] Specifically, the weighing scale is a filling scale, the filling scale includes a strain gauge sensor, and the device parameters of the strain gauge sensor are imported into the bypass metering calibration system. If the range of the strain gauge sensor is 3000 kg / 1 kg, the device parameters include the graduation number n of 3000, the actual graduation number of 1 kg, the sensor sensitivity of 2 mv / v, and the excitation voltage of 5 v;

[0035] The bypass metering calibration system multiplies the excitation voltage by the sensitivity of the strain gauge sensor to obtain the maximum output voltage. The calculation formula for the maximum output voltage is:

[0036] V max =V E ×S,

[0037] Among them, V max is the maximum output voltage, V E is the excitation voltage, S is the sensor sensitivity, and × represents multiplication;

[0038] The maximum output voltage of the strain gauge sensor is calculated through the maximum output voltage calculation formula, expressed as:

[0039] V max = 5V × 2mV / V = 10mV,

[0040] That is, when a 3000 kg weight is placed on the strain gauge sensor, a maximum voltage of 10 mV can be output;

[0041] The number of divisions is calculated according to the maximum output voltage through the electronic scale calculation formula, and the voltage value output for weighing a 1 kg weight is obtained. The electronic scale calculation formula is:

[0042]

[0043] Among them, V is the electronic scale and n is the number of divisions;

[0044] If data is substituted, the analog electronic scale V1 for 1 kg of the number of divisions is approximately 0.0033 mV, and after conversion, it is 3.3 μV. Thus, a digital model can be constructed for all the number of divisions within the range of 3000 of the weighing scale according to the analog electronic scale V1, that is, the weight corresponding to the voltage value output after weighing an object at each scale within the range of the weighing scale is calculated according to the analog electronic scale V1, and an analog-digital model is constructed in this way.

[0045] It should be understood that the strain gauge sensor is a bridge circuit, and the working principle with an excitation voltage resolution (i.e., sensor sensitivity) of 2 mV / V is as follows: When no object is placed on the sensor and a current of 10 mA flows through the high-precision resistor, the pressure difference is 0; when a 1 kg weight is placed on the sensor and a current of 10 mA flows through the high-precision resistor, a voltage deviation will occur, the current will change, and there will be a pressure difference. That is, when the current enters, the maximum pressure difference between the voltages output on both sides of the bridge circuit is 2 mV. If the sensor sensitivity is 1 mV / V, when the current enters, the maximum pressure difference between the voltages output on both sides of the bridge circuit is 1 mV.

[0046] In the embodiment of the present invention, an analog electronic scale is constructed according to the device parameters of the weighing scale. The analog electronic scale can calculate a higher number of precise digits compared to the weight value measured by the weighing scale, that is, it can accurately weigh the weight to many decimal places, and high-precision modeling of each weighing value within the range of the weighing scale is achieved.

[0047] Preferably, the voltage signal for calibration includes a plurality of sub-voltage signals for calibration;

[0048] Before the step in which the bypass metering calibration system calculates the voltage signal for calibration according to the analog electronic scale, it includes:

[0049] The bypass metering calibration system respectively converts a plurality of sub-voltage signals for calibration into a plurality of initial voltage values, screens the plurality of initial voltage values according to a preset maximum threshold to obtain a plurality of voltage values, screens the plurality of voltage values according to a preset minimum threshold to obtain a plurality of optimal voltage values, calculates the mean value of the plurality of optimal voltage values to obtain an initial average voltage value, and determines whether the initial average voltage value exceeds a set threshold range. If so, the initial average voltage value is optimized and adjusted to obtain an average voltage value.

[0050] If the initial average voltage value does not exceed the set threshold range, the initial average voltage value is used as the average voltage value.

[0051] It should be understood that the weighing scale includes a plurality of strain sensors, and each strain sensor collects a plurality of sub-voltage signals for calibration according to a corresponding preset sampling frequency.

[0052] In the embodiment of the present invention, during the weighing process, there will be electronic jitter in the voltage signal generated by the strain sensor, and when the loaded material is solid, there will be measurement errors due to uneven material distribution. The digital filter controls the jitter force (i.e., the initial average voltage value) in the plurality of sub-voltage signals within the set threshold range, making the measured weight of the object closer to the true value.

[0053] Preferably, the bypass metering calibration system calculates the voltage signal for calibration according to the analog electronic scale to obtain calibration data, including:

[0054] The bypass metering calibration system calculates the ratio of the average voltage value to the analog electronic scale to obtain calibration data.

[0055] Specifically, the average voltage value is divided by the analog electronic scale to obtain calibration data (i.e., the calibration value or the calibration value).

[0056] Preferably, the process of collecting calibration data is specifically as follows:

[0057] The weighing scale generates a calibration weight signal according to the material of any weight added, and the bypass metering calibration system converts the calibration weight signal into a calibration value. Then, the weighing scale generates a calibration weight signal according to the loaded calibration weight, and the bypass metering calibration system converts the calibration weight signal into a calibration value. The calibration value and the calibration value are used as calibration data; after multiple processes of collecting calibration data, multiple groups of different calibration data are obtained. The present invention selects 25 calibration weighing points.

[0058] Specifically, the strain gauge sensor of the weighing scale generates a voltage signal of the calibrated weight according to the material of any weight added. The bypass metering and calibration system converts the voltage signal of the calibrated weight into a calibrated weight voltage value, and calculates the calibrated weight according to the analog electronic ruler for the calibrated weight voltage value. After that, the strain gauge sensor of the weighing scale generates a voltage signal of the calibration weight according to the loaded calibration weight. The bypass metering and calibration system converts the voltage signal of the calibration weight into a calibration weight voltage value, and calculates the calibration weight according to the analog electronic ruler for the calibration weight voltage value. Among them, when the bypass metering and calibration system receives the voltage signal of the calibrated weight and the voltage signal of the calibration weight, digital filtering processing is performed on both of them.

[0059] Preferably, the bypass metering and calibration system calculates multiple slopes according to the multiple calibration data, and divides the slope intervals corresponding to the multiple calibration data, specifically:

[0060] The ratio calculation is respectively performed on the multiple calibration data through the slope calculation expression, and the slopes corresponding to the multiple calibrated weights are respectively obtained. The slope calculation expression is:

[0061]

[0062] Among them, K i is the slope, W i is the calibration weight, Z i is the calibrated weight, F i is the mass of the calibration weight;

[0063] The corresponding slope intervals are divided according to the multiple calibration weights. For example, zero to the first calibration weight W1 is the first slope interval [0, W1), and the corresponding slope is K1; the first calibration weight W1 to the second calibration weight W2 is the second slope interval [W1, W2), and the corresponding slope is K2, and so on. The (n - 1)th calibration weight W n-1 to the nth calibration weight W n is the second slope interval [W n-1 , W n , and the corresponding slope is K n . That is, the ith slope interval is [W i-1 , W i ), and the corresponding slope is K i .

[0064] Preferably, the evaluation weight is calculated according to the matching slope to obtain the simulated indication value, specifically:

[0065] The matching slope and the evaluation weight are calculated through the indication value calculation expression to obtain the simulated indication value. The indication value calculation expression is:

[0066] Y = K i F ′ ,

[0067] Wherein, Y is the true weight, K i is the slope, and F ′ is the mass of the pre-set evaluation weight.

[0068] In the embodiments of the present invention, the slopes corresponding to multiple calibration intervals are calculated through multi-point calibration, and the weighing results of the weighing scale are reflected by multiple slopes, showing a regular change in the divided measuring ranges. According to multiple slopes, when the weighing scale weighs the evaluation weight, the weight of the evaluation weight corresponding to the true weighing trend (i.e., the simulated indication value) is calculated, and the error calculation is performed with the display indication value of the weighing scale to determine whether there is a weighing fault in the weighing scale.

[0069] Preferably, the bypass metrology calibration system optimizes the weighing indication value to obtain the weighing indication value before rounding, including:[[]]

[0070] The bypass metrology calibration system calculates the weighing indication value before rounding according to the formula of the indication value before rounding, and the formula of the indication value before rounding is:[[]]

[0071]

[0072] Wherein, P is the weighing indication value before rounding, I is the weighing indication value, e is the verification scale interval, and ΔL is the mass value of the set rounding small weight.

[0073] It should be understood that in the current weight regulations, the mass of the weights is not less than 1 mg, so the quantity transfer and traceability of less than 1 mg are all carried out through an electronic balance for fine division of precision. Even now, 1 μg is also rounded and subdivided through mass digital subdivision technology. The display screen of the filling scale is used to display the display indication value (i.e., the weighing indication value) of the voltage conversion of the strain gauge sensor, which can only be accurate to 1 kg. Therefore, the recognition accuracy of the display indication value of the filling scale (i.e., the weighing scale) is increased by 10 times through mass digital subdivision technology to more accurately judge the error between the display indication value and the simulated indication value of the weighing scale.

[0074] In the embodiments of the present invention, due to the limitation of the recognition accuracy of the weighing scale, the display indication value of the weighing scale will round off the value after voltage conversion, resulting in an error from the actual value. The mass value is processed through mass digital subdivision technology to obtain the value before rounding to the greatest extent.

[0075] Preferably, after the step of determining whether the error is greater than the set error threshold, it further includes:[[]]

[0076] When the error is greater than the set error threshold, verify whether the bypass metering calibration system is faulty. Specifically:

[0077] The weighing scale generates a first voltage signal for verification according to the loaded verification weights, and the electromagnetic force electronic balance generates a second voltage signal for verification according to the loaded verification weights.

[0078] The bypass metering calibration system calculates the first verification internal code value for verification according to the analog electronic ruler for the first voltage signal for verification, calculates the second verification internal code value for verification according to the constructed standard electronic ruler for the second voltage signal for verification, performs a ratio calculation on the first verification internal code value and the second verification internal code value to obtain a verification ratio, and determines whether the verification ratio is consistent with the preset verification ratio. If not, it is determined that the bypass metering calibration system is faulty. If consistent, it is determined that the weighing scale is faulty.

[0079] Among them, the bypass metering calibration system performs digital filtering processing on both the first verification voltage signal and the second verification voltage signal.

[0080] Specifically, load 200 kg of verification weights on the weighing scale, and the weighing sensor generates a first voltage signal for verification according to the weights.

[0081] Load 20 kg of verification weights on the electromagnetic force electronic balance, and the electromagnetic force electronic balance generates a second voltage signal for verification according to the weights.

[0082] The bypass metering calibration system performs a ratio calculation on the first verification internal code value and the second verification internal code value through the verification ratio expression to obtain the verification ratio. The verification ratio expression is:

[0083]

[0084] Among them, K i ′ is the verification ratio, n C is the second verification internal code value, n B is the first verification internal code value.

[0085] In the embodiment of the present invention, when determining whether the verification ratio is consistent with the preset verification ratio, the correctness of the slope is traced and verified to exclude the inconsistency between the actual weight and the weighed weight caused by inaccurate slope, and then it is deduced that the weighing sensor of the weighing scale is faulty. Using the electromagnetic force electronic balance for traceability realizes high-level and stable metrological traceability.

[0086] Preferably, the construction process of the standard electronic ruler includes:

[0087] The bypass measurement calibration system performs multiplication calculation based on the sensitivity of the imported electromagnetic force electronic balance and the excitation voltage to obtain a second maximum output voltage, and performs ratio calculation on the second maximum output voltage and the number of divisions of the electromagnetic force electronic balance to obtain a standard electronic ruler.

[0088] Specifically, according to the working principle of the electromagnetic force electronic balance, it is deduced that the voltage change of the electromagnetic force electronic balance changes with the weight, and the derivation process includes:

[0089] Combining the Ampère force formula with the gravity formula, we can derive the current used when placing an object on the electromagnetic force electronic balance. Then, based on Ohm's law, we can derive the relationship between mass and voltage. The Ampère force formula is:

[0090] F = BIL,

[0091] Among them, F is the ampere force, B is the magnetic field strength, I is the current intensity, and L is the wire length;

[0092] The gravity formula is:

[0093] F=mg,

[0094] Among them, F is gravity, m is mass, and g is gravitational acceleration;

[0095] Combining the Amber force formula with the gravity formula yields:

[0096]

[0097] Will As a constant K, then:

[0098] m=KI,

[0099] Ohm's law is:

[0100]

[0101] Where V is voltage and R is resistance;

[0102] Then the current is converted into voltage through high-precision resistors and becomes a stable voltage, which can be deduced:

[0103]

[0104] Since the resistance is fixed, the relationship between mass and voltage is:

[0105] m=KV,

[0106] The weight of the object can be derived from the voltage generated when the object is placed on the electromagnetic force electronic balance.

[0107] Specifically, import the device parameters of the electromagnetic force electronic balance into the bypass metering calibration system. If the range of the electromagnetic force electronic balance is 32 kg / 0.01 g, the device parameters include the number of divisions n of 3,200,000, the actual number of divisions of 0.01 g, the sensor sensitivity of 2 mv / v, and the excitation voltage of 5 v;

[0108] The bypass metering calibration system multiplies the excitation voltage by the sensitivity of the strain gauge sensor to obtain the maximum output voltage. The calculation formula is:

[0109] V max = 5 v × 2 mv / v = 10 mv,

[0110] That is, placing a 32 kg weight on the electromagnetic force electronic balance can output a maximum voltage of 10 mv;

[0111] Calculate the number of divisions according to the maximum output voltage through the electronic scale calculation formula, and obtain the voltage value of 0.31 μv (i.e., the standard electronic scale) output when weighing a 0.01 g weight. The calculation formula is:

[0112] V2 = 10 mv / 3,200,000 g ≈ 0.00031 mv ≈ 0.31 μv.

[0113] The subdivision degree of the scale value of the standard electronic scale is much higher than that of the filling scale to be calibrated. However, considering some interference factors, in order to ensure the accuracy and reliability of metering, the second verification internal code value is amplified by 10 times for processing. The amplified standard electronic scale is 0.310 μv. Thus, a digital model can be established for all the number of divisions of the electromagnetic force electronic balance within the range of 3,200,000 according to the standard electronic scale V2, that is, calculate the weight corresponding to the voltage value output after weighing an object at each scale within the range of the electromagnetic force electronic balance according to the standard electronic scale V2, and construct a standard digital model accordingly.

[0114] In the embodiment of the present invention, a standard electronic scale is constructed according to the device parameters of the electromagnetic force electronic balance, and the weight voltage measured by the electromagnetic force electronic balance is converted using the standard electronic scale. The converted value has a higher number of significant digits compared to the weight value measured by the weighing instrument. During the traceability verification, it is verified through a scale value higher than that of the weighing instrument, making the verification result more accurate.

[0115] Preferably, calculating the second verification internal code value by calculating the ratio of the second voltage signal for verification to the constructed standard electronic scale includes:

[0116] Calculating the ratio of the second voltage signal for verification to the constructed standard electronic scale to obtain the second verification internal code value.

[0117] In the embodiment of the present invention, based on a high-precision resistor, the bypass metering and calibration system performs A / D conversion through an analog-to-digital converter, converts the voltage into the number of crystal oscillators (10mv = 10HZ) and reads it, and calculates the weight value according to the ratio calculation of a standard electronic ruler.

[0118] Preferably, calculating the error between the weighing indication value before rounding and the analog indication value is expressed as:

[0119] E = I a -I b ,

[0120] wherein, I a is the analog indication value, I b is the weighing indication value before rounding, E is the error, and the error threshold is set to 2% of the verification requirement.

[0121] Preferably, before the step of collecting calibration data of multiple calibration objects with different weights, it includes:

[0122] The weighing scale generates a voltage signal for verification according to the calibration object with any weight loaded;

[0123] The bypass metering and calibration system calculates the set converter bits, the set reference voltage, and the voltage signal for verification according to the graduation calculation expression to obtain the calibration graduation number, and determines whether the calibration graduation number is greater than the set verification regulation value. If it is not greater, it is determined that the bypass metering and calibration system fails. The graduation calculation expression is:

[0124]

[0125] wherein, n is the calibration graduation number, V P is the value of the verification voltage signal, v is the reference voltage, x is the converter bits, and the present invention selects a 24-bit converter.

[0126] In the embodiment of the present invention, since the graduation number of the calibration device needs to reach the specified value during calibration to perform the calibration operation on the device to be inspected, the detection graduation number of the bypass metering and calibration system is verified by loading materials with any weight to ensure that the calibration device can be used normally.

[0127] As Figure 2 shown, a digital modeling calibration device for a weighing scale for improving metering accuracy provided by the embodiment of the present invention includes: a weighing scale and a bypass metering and calibration system. The bypass metering and calibration system includes a calibration acquisition module, a calibration calculation module, a calibration calculation module, and a calibration judgment module;

[0128] The weighing scale is used to generate a voltage signal for calibration according to the calibration object with any weight loaded;

[0129] The calibration acquisition module is used to construct a simulated electronic scale according to the device parameters of the imported weighing scale, calculate the calibration voltage signal according to the simulated electronic scale, and obtain calibration data;

[0130] The calibration calculation module is used to calculate multiple slopes based on the multiple calibration data and divide the slope intervals corresponding to the multiple calibration data;

[0131] The weighing scale is further used to generate an evaluation voltage signal according to the loaded evaluation weights, and convert the evaluation voltage signal to obtain a weighing indication value;

[0132] The calibration calculation module is used to calculate an evaluation value according to the simulated electronic scale for the evaluation voltage signal, match the evaluation value with the slope interval to obtain a matching slope, and calculate the evaluation weights according to the matching slope to obtain a simulated indication value;

[0133] The calibration judgment module is used to optimize the weighing indication value to obtain the weighing indication value before rounding, calculate the error between the weighing indication value before rounding and the simulated indication value, and judge whether the error is greater than the set error threshold. If so, it is determined that the weighing scale is faulty and optimized.

[0134] For the above digital modeling calibration device for a weighing scale to improve measurement accuracy, reference can be made to the implementation content and its beneficial effects described in detail above for a digital modeling calibration method for a weighing scale to improve measurement accuracy, which will not be elaborated here.

[0135] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0136] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described device and module can refer to the corresponding processes in the foregoing method embodiments, which will not be elaborated here.

[0137] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0138] The modules described as separate components may or may not be physically separated. The components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present invention.

[0139] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A digital modeling and calibration method for a weighing scale to improve measurement accuracy, characterized in that: The steps include: The bypass measurement and calibration system constructs a simulated electronic ruler based on the equipment parameters of the imported weighing scale; Calibration data collection of multiple calibration objects of different weights is performed, wherein the calibration data collection process is as follows: the weighing instrument generates a voltage signal for calibration according to the calibration object of any weight loaded, and the bypass measurement calibration system calculates the voltage signal for calibration according to the analog electronic ruler to obtain calibration data; after multiple calibration data collection processes, multiple calibration data are obtained; The bypass measurement calibration system calculates a plurality of slopes according to the plurality of calibration data, and divides the slope intervals corresponding to the plurality of calibration data; The weighing scale generates a voltage signal for evaluation according to the loaded evaluation weight, and converts the voltage signal for evaluation to obtain a weighing indication, the bypass measurement calibration system calculates the voltage signal for evaluation according to the analog electronic ruler to obtain an evaluation value, matches the evaluation value with the slope interval to obtain a matching slope, and calculates the evaluation weight according to the matching slope to obtain an analog indication; The bypass measurement and calibration system optimizes the weighing indication to obtain the weighing indication before rounding, calculates the error between the weighing indication before rounding and the simulation indication, and determines whether the error is greater than a set error threshold. If so, the weighing scale is determined to be faulty and optimized.

2. The digital modeling and calibration method for weighing instruments for improving measurement accuracy according to claim 1 is characterized in that: The weighing scale includes a strain sensor; The bypass measurement and calibration system constructs a simulated electronic ruler according to the equipment parameters of the imported weighing scale, including: The bypass measurement calibration system performs multiplication calculation based on the sensitivity of the imported strain sensor and the excitation voltage to obtain a first maximum output voltage, and performs ratio calculation on the first maximum output voltage and the number of divisions of the strain sensor to obtain an analog electronic ruler.

3. The digital modeling and calibration method for weighing instruments for improving measurement accuracy according to claim 1 is characterized in that: The voltage signal for calibration includes a plurality of sub-voltage signals for calibration; Before the bypass measurement calibration system calculates the voltage signal for calibration according to the analog electronic ruler, the bypass measurement calibration system includes: The bypass measurement and calibration system converts the multiple sub-voltage signals for calibration into multiple initial voltage values ​​respectively, screens the multiple initial voltage values ​​according to a preset maximum threshold to obtain multiple voltage values, screens the multiple voltage values ​​according to a preset minimum threshold to obtain multiple optimal voltage values, calculates the average of the multiple optimal voltage values ​​to obtain an initial average voltage value, determines whether the initial average voltage value exceeds a set threshold range, and if so, optimizes and adjusts the initial average voltage value to obtain an average voltage value.

4. The digital modeling and calibration method for weighing instruments for improving measurement accuracy according to claim 3 is characterized in that: The bypass measurement calibration system calculates the voltage signal for calibration according to the analog electronic ruler to obtain calibration data, including: The bypass measurement calibration system calculates the ratio of the average voltage value to the analog electronic ruler to obtain calibration data.

5. The digital modeling and calibration method for weighing instruments for improving measurement accuracy according to claim 1 is characterized in that: The bypass measurement and calibration system optimizes the weighing indication to obtain the weighing indication before rounding, including: The bypass measurement and calibration system calculates the weighing indication according to the indication formula before rounding to obtain the weighing indication before rounding, and the indication formula before rounding is: Among them, P is the weighing value before rounding, I is the weighing value, e is the verification graduation value, and ΔL is the mass value of the small weight after rounding.

6. The digital modeling and calibration method for weighing instruments for improving measurement accuracy according to claim 1 is characterized in that: After the step of determining whether the error is greater than a set error threshold, the method further includes: When the error is greater than the set error threshold, verify whether the bypass measurement and calibration system is faulty, specifically: The weighing scale generates a first voltage signal for verification according to the loaded verification weight, and the electromagnetic force electronic balance generates a second voltage signal for verification according to the loaded verification weight; The bypass measurement and calibration system calculates the first voltage signal for verification according to the analog electronic ruler to obtain a first verification internal code value, calculates the second voltage signal for verification according to the constructed standard electronic ruler to obtain a second verification internal code value, calculates the ratio of the first verification internal code value to the second verification internal code value to obtain a verification ratio, and determines whether the verification ratio is consistent with a preset verification ratio. If not, it is determined that the bypass measurement and calibration system is faulty. If they are consistent, it is determined that the weighing scale is faulty.

7. The digital modeling and calibration method for weighing instruments for improving measurement accuracy according to claim 6 is characterized in that: The construction process of the standard electronic ruler includes: The bypass measurement calibration system performs multiplication calculation based on the sensitivity of the imported electromagnetic force electronic balance and the excitation voltage to obtain a second maximum output voltage, and performs ratio calculation on the second maximum output voltage and the number of divisions of the electromagnetic force electronic balance to obtain a standard electronic ruler.

8. The digital modeling and calibration method for weighing instruments for improving measurement accuracy according to claim 6 is characterized in that: The step of calculating the second voltage signal for verification according to the constructed standard electronic ruler to obtain a second verification internal code value includes: A ratio calculation is performed between the second voltage signal for verification and the constructed standard electronic ruler to obtain a second verification internal code value.

9. The digital modeling and calibration method for weighing instruments for improving measurement accuracy according to claim 1 is characterized in that: Before the step of collecting calibration data of a plurality of calibration objects of different weights, the method includes: The weighing scale generates a voltage signal for identification based on the calibration object of any weight loaded; The bypass measurement and calibration system calculates the set number of converter bits, the set reference voltage and the voltage signal for identification according to the division number calculation expression to obtain the calibration division number, and determines whether the calibration division number is greater than the set verification procedure value. If not, the bypass measurement and calibration system is judged to be faulty. The division number calculation expression is: Where n is the calibration division number, x is the number of converter digits, V P To identify the voltage value, v is the reference voltage.

10. A digital modeling and calibration device for a weighing scale for improving measurement accuracy, characterized in that: include: Weighing scale and bypass measurement and calibration system, the bypass measurement and calibration system includes a calibration acquisition module, a calibration calculation module, a calibration calculation module and a calibration judgment module; A weighing scale is used to generate a voltage signal for calibration according to a calibration object of any weight loaded; A calibration acquisition module, used to construct a simulated electronic ruler according to the equipment parameters of the imported weighing scale, and calculate the voltage signal used for calibration according to the simulated electronic ruler to obtain calibration data; A calibration calculation module, used to calculate a plurality of slopes according to the plurality of calibration data, and divide the slope intervals corresponding to the plurality of calibration data; The weighing scale is also used for generating a voltage signal for evaluation according to the loaded evaluation weight, and converting the voltage signal for evaluation to obtain a weighing indication; a calibration calculation module, configured to calculate the voltage signal for evaluation according to the analog electronic ruler to obtain an evaluation value, match the evaluation value with the slope interval to obtain a matching slope, and calculate the evaluation weight according to the matching slope to obtain a simulated indication; The calibration judgment module is used to optimize the weighing indication, obtain the weighing indication before rounding, calculate the error between the weighing indication before rounding and the simulation indication, and judge whether the error is greater than a set error threshold. If so, the weighing scale is judged to be faulty and optimized.

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