Weighing calibration method and device

Abstract

The invention relates to the technical field of electronic scale calibration, in particular to a weighing calibration method which comprises a modeling module, a traceability electronic scale, a traceability weight, an industrial-grade router and a weighing system remote online calibration app. The method comprises the following steps: carrying out digital modeling on a weighing range of a calibrated material tank scale through weight or material superposition, establishing a standard model through tracing of a high-precision single magnetic cylinder electronic scale, carrying out integration subdivision on a sampling voltage, and finally comparing a standard indicating value of an actual slope model of the subdivided calibrated material tank scale with an original indicating value of the calibrated material tank scale to obtain a real error value. Comprising a single sensor, the processing relates to a series of latest technologies such as materials, hyperfine processing, superspeed cutting, precise online measurement, real-time abrasion and temperature compensation, and the manufactured analytical balance is quicker in response, more stable in indicating value reading, firmer and more durable, and is slightly influenced by environment temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic scale calibration, in particular to a weighing calibration method and device. BACKGROUND

[0002] Because the structure of large tank scale and special large scale electronic scale (hereinafter referred to as: special scale) is very complex, the weighing interference factors are many, the loading of the weight and the material is difficult, and the calibration is inaccurate. The method in the existing related regulations and specifications does not match the actual measurement characteristics of the special scale, and cannot be executed. At present, the measurement industry has also developed many methods for special scales, and the method that can be basically implemented in theory is to calibrate the standard control balance, and the material is stacked into the calibrated balance multiple times, which has the problems of time-consuming, laborious, large error and the like. SUMMARY

[0003] In view of the above problems, the present application provides a weighing calibration method and device, which solves the problems of complicated steps and large error during calibration of large scale electronic scale.

[0004] The technical scheme of the present application is as follows: a weighing calibration method, the method comprising the following steps: S1, a bypass modeling module samples the electronic analog signal of the calibrated tank scale sensor through bypass sampling; S2, the digital modeling of the calibrated tank scale weighing range is established through the stacking of the weight or the material, and the standard model is established through the high-precision single magnetic cylinder electronic balance traceability, and the integral subdivision sampling voltage is obtained; S3, finally, the standard value of the actual slope model of the calibrated tank scale is compared with the original value of the calibrated tank scale, and the true error value is obtained.

[0005] Preferably, the calibration adopts the bypass online connection mode to sample the original signal of the weighing sensor of the calibrated tank scale.

[0006] On the other hand, the present application also provides a device for realizing the above-mentioned weighing calibration method, comprising an integrally formed base body, a scanner is installed on the inner side of the base body, a magnetic steel magnet assembly is installed in the middle of the base body, and a coil is installed on the inner side of the magnetic steel magnet assembly.

[0007] The beneficial effects of the present application are as follows: The single sensor of the present application is a complete modular sensor except for the magnetic cylinder and the coil, which is formed by machining a piece of aviation aluminum alloy on a 20000rpm ultra-high-speed five-axis machining center. The machining of the sensor involves a series of latest technologies such as material, ultra-fine machining, ultra-high-speed cutting, precise online measurement, real-time wear and tear, and temperature compensation. The analytical balance manufactured by using such technology has faster response, more stable value reading, more solid and durable, and is less affected by environmental temperature. BRIEF DESCRIPTION OF DRAWINGS

[0008] The application will be further described below in conjunction with the drawings and embodiments.

[0009] Figure 1 A structural schematic diagram of a weighing calibration device provided by the application; Figure 2 An exploded view of a weighing calibration device provided by the application; Figure 3 A workflow diagram of the method of the application; Figure 4 A system principle diagram of the application; Figure 5 A process diagram of transferring the accuracy of a balance in the prior art to a test weight; Figure 6 A process diagram of pouring the weighed material into a special scale to be calibrated; Figure 7 A process diagram of a modeling method of successively stacking weights; Figure 8 A schematic diagram of an electronic subdividing scale; Figure 9 A real-time verification step diagram of the application.

[0010] In the drawings: 1, magnetic steel system upper cover; 2, scanner; 3, triangular base plate; 4, base; 5, coil; 6, magnetic steel magnet assembly. DETAILED DESCRIPTION

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the application will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the drawings structure is only some embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor. It should be noted that the description of these embodiment modes is used to help understand the application, but does not constitute a limitation on the application.

[0012] Embodiment one: As shown in the drawings, the application provides a weighing calibration method, which comprises the following steps: Figures 1-9 S1, a bypass modeling module samples the electronic analog signal of the sensor of the material tank scale to be calibrated by bypass; S2, the weight range of the material tank scale to be calibrated is digitally modeled by stacking weights or materials, and a standard model is established by tracing the high-precision single magnetic cylinder electronic balance, and the integral subdivision sampling voltage is converted. ​S3, finally, the standard indication value of the actual slope model of the subdivided material tank scale to be calibrated is compared with the original indication value of the material tank scale to be calibrated, and a true error value is obtained.

[0013] The calibration adopts a bypass online connection mode to sample the original signal of the weighing sensor of the material tank scale to be calibrated.

[0014] The weighing sensor is a single sensor; and / or The single sensor is a complete modular sensor except a magnetic cylinder and a coil, which is formed by one piece of aviation aluminum alloy on a super-speed five-axis machining center at 20000 rpm.

[0015] Embodiment two: The application also provides a device for the weighing calibration method, which comprises an integrally-formed base body 4, a scanner 2 is installed on the inner side of the base body 4, a magnetic steel magnet assembly 6 is installed in the middle of the base body 4, and a coil 5 is installed on the inner side of the magnetic steel magnet assembly 6.

[0016] A triangular bottom plate 3 is installed at the bottom of the base body 4, a magnetic steel system upper cover 1 is installed at the top of the base body 4, and the scanner 2 has high resolution and can distinguish nanometer-level light wave fluctuations.

[0017] Modeling module: single-power modeling module and double-power modeling module; Traceable electronic balance and traceable weight: 32 kg / 0.01 g; F1 grade 20 kg weight; Weighing system remote online calibration app (HONMENG system tablet or mobile phone, compatible with Xiaomi).

[0018] The online calibration device is composed of a bypass modeling module and a traceable high-precision single-magnetic-cylinder electronic balance and a professional data analysis software APP, and adopts a bypass online connection mode to sample the original signal of the weighing sensor of the material tank scale to be calibrated. The bypass modeling module functions to subdivide the sampling voltage, process data, store data, and output the actual slope digital model (a complex curve digital model can be realized) and data and digital model of the weight range of the material tank scale to be calibrated by weight or material stacking; the high-precision single-magnetic-cylinder electronic balance functions to measure the digital model traceability, establish an accurate standard model, and ensure the accuracy and reliability of the digital model.

[0019] It should be noted that the weighing calibration method of the application is derived from the following: (1) Weighting principle of the weight (JJG99) ABBA 1. The standard weight mA value is transmitted to the detected weight mB through the balance c with known accuracy, and the flow is as shown in Figure 5 .

[0020] 2. The same process can be used to verify the correctness of the balance c with known mA value and known mB value.

[0021] (II) According to the automatic weighing instrument specification, the concept of standard scale is introduced for tank scale or special scale.

[0022] First, verify the standard control scale sA (standard scale has been traceable and qualified) by standard weight mA, then put the material into the standard control scale sA, and then pour the weighed material mB into the calibrated special scale st for calibration, as shown in the flow chart of Figure 6 .

[0023] (III) Because of the special structure of the calibrated special scale st, it cannot load many weights at one time, so the weight material stacking modeling method and the known mass material stacking modeling method are proposed.

[0024] The weight material stacking modeling method is shown in the flow chart of Figure 7 .

[0025] The bypass modeling module bypasses the sampling of the electronic analog signal of the calibrated scale sensor, and models the full range of the calibrated material tank scale by stacking weights or materials.

[0026] Micro-sampling technology A: user's power ≥1000mA; online real-time verification module is 20mA-35mA. It will not affect the original sensor system, and they will work independently without interference.

[0027] Sampling voltage preloading non-interference technology B: lithium battery starts preloading sampling current to the sampling port through electronic switch, and disconnects after the sampling current is stable, keeping the sampling stable and not interfering with the calibrated system.

[0028] The digital model is traceable to high-grade weights through high-precision single electronic balance: according to the weight quantity transmission requirements, through a large number of experiments, max=32kg, d=0.01g high-precision single magnetic cylinder electronic balance is used for traceability, because this balance has a stable single sensor to ensure the stability of the value, and the sampling voltage of this balance is 10mA-50mA, which can cover the sampling voltage of the strain sensor (the change of the strain sensor is basically 2mv / v), which can provide real-time standard signal for integer subdivision sampling voltage.

[0029] Voltage integer subdivision principle: according to the current weight regulation, there is no weight less than 1mg, so the weight quantity transmission and traceability of less than 1mg is obtained by electronic subdivision and digital comparison of electronic balance, and now 0.1ug can also be displayed by electronic balance quality digital subdivision technology. Therefore, this method fully meets the accuracy requirements of weighing system calibration. The value formula before integer division is based on , Where P is the value before rounding, I is the displayed value, e is the certified value, AL is the rounding down weight value, d is the actual number of divisions. Through this formula, the resolution can be improved by 10 times.

[0030] Single electromagnetic force electronic balance working principle and the standard voltage value corresponding to the standard weight: single sensor is a piece of aviation aluminum alloy in 20000 rpm super-speed five-axis machining center on the one-time molding a complete modular sensor except magnetic cylinder and coil, the processing of the sensor involves a series of the latest technologies such as material, ultra-fine processing, ultra-high speed cutting, precision online measurement, real-time wear and temperature compensation. The analytical balance made by this technology, the response speed is improved by 50% on the basis of the original, the temperature drift is reduced by 60%, the stability is improved by 80%, and the highest resolution can reach 1x10-8. Faster response, more stable value reading, more solid and durable, and less affected by environmental temperature.

[0031] Single electromagnetic force electronic balance working principle and the standard voltage value corresponding to the standard weight: Electronic balance principle formula: (B: magnetic field intensity, I: current intensity, L: wire length); The working principle of electronic balance is to push a 1 kg weight, and the current used is: , It is derived that , And from the constant K, we can get: , It is equivalent to: , The current is converted into voltage through high-precision resistance, becoming a stable voltage: , The current passing through: ; As we know before: ; It can be deduced that: ; Since the resistance is fixed, this time And v form a relationship: , From which we can get the standard voltage value corresponding to the standard weight.

[0032] Electronic balance sampling voltage rounding subdivision: ADC principle: ADC has many configurations, the common ones are successive approximation type, integral type and ∑-delta type, parallel comparison type, etc. The balance is of successive approximation type. When weighing, the object to be measured is placed at one end, and the weight is placed at the other end. If the weight end is relatively heavy, remove one, and then place the second weight until the weights on both ends are equal.

[0033] The successive approximation type is composed of a comparator, a D / A converter, a buffer register and several control logic circuits. The ADC compares bit by bit from high to low, and the working process is as follows: 1. Clear the buffer register 2. After the conversion starts, first send the high bit of the register to 1 to the D / A converter, and the analog quantity converted by the D / A converter is sent to the comparator, which is called Vo.

[0034] 3. If vo<0, compare it with the analog quantity VI to be converted by the comparator; keep the bit, otherwise clear it to 0.

[0035] 4. Set the second high order of the register to 1, send the new digital quantity in the register to the D / A converter, and then compare the output VO with VI. If VO<0; keep the bit, otherwise clear it to 0, and loop this process until the low bit of the register gets the output of the digital quantity.

[0036] The precision of ADC is determined by the number of bits, for example, 16-bit ADC, 24-bit ADC, 32-bit ADC, for example, a 16-bit ADC with a full-scale voltage of 5V represents the resolution of the ADC as 2 raised to the power of 16, totaling 65536 bits, i.e. the small change amplitude of 16-bit ADC is 1 bit. 5V is divided into 65536 parts, and the small voltage change that can be measured is 5 / 65536v. Now we read the ADC value as 1200, then the actual voltage should be 1200*5 / 65535.

[0037] The reference voltage is the basic guarantee of the accuracy of ADC measurement. The design of reference voltage is very important, which is related to the accuracy of the whole system design. The 5vadc mentioned in the above example means that the reference voltage of this ADC is 5V. When the ADC is at full scale, the measured value is the reference voltage, which is used to correct the measured value.

[0038] The electronic balance used for tracing this device is 32kg / 0.01g, and the standard weight is placed on the electronic balance to output a standard voltage of 10mv. Because the electromagnetic force balance can distinguish 0.01g, the output voltage value of 0.01g is derived as follows: 10mv / 3200000g≈0.00031mv≈0.0031uv By placing the standard weight, the standard value is obtained, thereby establishing the standard electronic scale. At this time, the electronic balance will output 10mv voltage subdivided into the standard electronic scale with a scale of 0.0033uv, while the calibrated material tank scale can only subdivide 10mv voltage into an electronic scale with a scale of 3.3uv, which is much higher than the subdivision degree of the calibrated material tank scale. However, considering the existence of some interference factors, in order to ensure the accuracy and reliability of measurement, we amplify the standard electronic scale result interference by 10 times through software to process errors, and the scale is amplified to 0.033uv.

[0039] 4.2) The processing flow of converting the collected voltage value (Vp) into the standard mass value (m): The calibrated voltage value collected by the bypass standard display is 408.0852uv, and the electronic balance generates a standard voltage with a stability better than 0.0033uv. Using a 24-bit A / D converter, through the formula: ,

[0040] In the formula: n—bit number, Vp—collected voltage value, m—mass value, v—reference voltage.

[0041] For example: calculated according to 50% maximum sampling voltage.

[0042] ,

[0043] The division number of the bypass standard display is much larger than the division number of the calibrated system.

[0044] As shown in Figure 8 , through the subdivision scale 0.0033uv of the standard electronic scale, the collected 408.0582uv voltage can be recognized to 408.058uv, and the indication value Ia of the bypass standard display is obtained.

[0045] ,

[0046] Indication value comparison: E=Ia-Ib=123.654g-124g=-0.346g.

[0047] Digital measurement model full-range multi-slope curve synthesis technology: Multi-slope calibration method, each time the data collection adds different weight of material, the entire weighing range of the weighing instrument is subdivided into multiple small ranges, and the slope of each small range is calculated after calibration. Get multiple slopes of the entire weighing range, which can obtain the real weighing value curve corresponding to the indication value of the weighing instrument with the increase or decrease of the material in real time according to the slope.

[0048] Real-time online verification module, which can be used in combination, calibrating large-tonnage scales.

[0049] The digital metering model module employs hardware and software encryption technologies: the hardware enables wireless and wired encrypted transmission, while the software is implemented using the HarmonyOS system and requires a registration code for installation and device binding. Transmitted files are encrypted in hexadecimal format, significantly enhancing user data security.

[0050] The digital module compares the data from the standard model, the traceability standard value, and the value of the scale being calibrated in real time, which can prevent cheating. Because the module's data is transmitted in real time, it can monitor the data of the special scale being calibrated. If any abnormality occurs, an alarm will be triggered, and abnormal data prompts can be obtained in a timely manner for correction. Real-time online monitoring.

[0051] If a sensor is defective, it can be immediately identified and determined to be defective through multiple real-time verifications using mA and mB.

[0052] After equipment calibration, calibration data and equipment information will be stored in the database. Subsequent calibrations can be performed remotely, while the module monitors in real time. The module also has a memory function; it only needs to be calibrated once, after which it will create a model and have a powerful model library. Subsequent calibrations will not require further calibration; the module can find the corresponding model for the specific scale being tested and perform calibration accordingly.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of weighing calibration, characterized by, The method comprises the following steps: S1, the bypass modeling module samples the electronic analog signal of the calibrated material tank scale sensor through bypass; S2, the digital model of the calibrated material tank scale weight range is modeled through the weight or material superposition, and the standard model is established through high-precision single magnetic cylinder electronic balance traceability to subdivide the sampling voltage; S3, finally, the standard indication value of the actual slope model of the calibrated material tank scale is compared with the original indication value of the calibrated material tank scale, and the true error value is obtained.

2. A method of weighing calibration according to claim 1, characterized in that: The calibration adopts a bypass online connection mode to sample the original signal of the weighing sensor of the calibrated material tank scale.

3. A method of weighing calibration according to claim 2, characterised in that: The weighing sensor is a single sensor; and / or The single sensor is a complete modular sensor except the magnetic cylinder and the coil, which is formed by one piece of aviation aluminum alloy on a 20000 rpm ultra-high-speed five-axis machining center.

4. A device for implementing the method of weighing calibration according to any one of claims 1 to 3, characterized in that: The device comprises an integrally formed base body (4), a scanner (2) is installed on the inner side of the base body (4), a magnetic steel magnet assembly (6) is installed in the middle of the base body (4), and a coil (5) is installed on the inner side of the magnetic steel magnet assembly (6).

5. A device for implementing a method of weighing calibration according to claim 4, characterized in that: A triangular bottom plate (3) is installed at the bottom of the base body (4).

6. A device for implementing a method of weighing calibration according to claim 5, characterized in that: A magnetic steel system upper cover (1) is installed at the top of the base body (4).

7. A device for implementing a method of weighing calibration according to claim 6, characterized in that: The scanner (2) has high resolution and can distinguish nanometer-level light wave fluctuations.

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