CN117782274A - Strain gauge electronic balance and correction method thereof - Google Patents
Strain gauge electronic balance and correction method thereof Download PDFInfo
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- CN117782274A CN117782274A CN202311818049.3A CN202311818049A CN117782274A CN 117782274 A CN117782274 A CN 117782274A CN 202311818049 A CN202311818049 A CN 202311818049A CN 117782274 A CN117782274 A CN 117782274A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012937 correction Methods 0.000 title abstract description 17
- 230000005484 gravity Effects 0.000 claims abstract description 27
- 238000012935 Averaging Methods 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Abstract
The invention discloses a strain gauge electronic balance and a correction method thereof.A support arm is arranged on a base and is used for supporting the weight of a measured object; the sensor assembly comprises a first strain gauge sensor for measuring the weight of an object placed on the scale pan and a second strain gauge sensor for correcting the horizontal deviation and the difference between the gravity and the calibration, and the first strain gauge sensor and the second strain gauge sensor are arranged on the upper surface of the base in parallel; the built-in weight is arranged on the support arm, and the support arm can load the built-in weight onto the second strain gauge sensor; the two A/D converters are respectively connected with the first strain gauge sensor and the second strain gauge sensor and are used for measuring and converting the resistance change of the sensor assembly; the scale pan is arranged above the first strain gauge sensor. According to the strain gauge electronic balance provided by the invention, the built-in weights are arranged on the balance, and the sensor assembly and the A/D converter are utilized to correct the level and the gravity, so that the gravity of the needed weights is reduced.
Description
Technical Field
The invention belongs to the technical field of weighing, and particularly relates to a strain gauge electronic balance and a correction method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The electronic balance is a measuring instrument commonly used in industrial production and scientific research experiments, the measuring accuracy of the measuring instrument directly influences the accuracy of a measuring result, and the level and the gravity error of the electronic balance are two main factors influencing the measuring accuracy.
At present, the correction of the horizontal and gravity errors of the electronic balance mainly adopts the following methods: 1. mechanical adjustment method: the supporting structure of the electronic balance is adjusted to enable the electronic balance to reach a horizontal state, and the method is simple and special-shaped, but has lower precision; 2. optical measurement method: the level and the gravity center position of the electronic balance are measured through the optical measuring equipment, and the method has higher precision but higher cost.
In many application fields, it is required to accurately measure the mass of an object, and the conventional balance usually uses an external weight for level and gravity correction to obtain an accurate mass measurement result, however, the weight of the external weight needs to be adjusted according to the measuring range of the balance, generally at least 1/3 of the measuring range, and the balance with the measuring range of 3kg needs to be a built-in weight of 1kg, so that the weight of the balance and the supporting force of the lifting weight structure are greatly increased.
It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present invention and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the invention section.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a strain gauge electronic balance and a correction method thereof, wherein the balance is provided with a built-in weight to correct the horizontal and gravity, so that the gravity of the needed weight is reduced.
The invention discloses a strain gauge electronic balance, which is used for accommodating a battery module and comprises the following components:
a base;
the support arm is arranged on the base and used for supporting the weight of a measured object;
the sensor assembly comprises a first strain gauge sensor for measuring the weight of an object placed on the scale pan and a second strain gauge sensor for correcting the horizontal deviation and the difference between gravity and calibration, and the first strain gauge sensor and the second strain gauge sensor are arranged on the upper surface of the base in parallel;
the built-in weight is arranged on the support arm, and the support arm can load the built-in weight onto the second strain gauge sensor;
the two A/D converters are respectively connected with the first strain gauge sensor and the second strain gauge sensor and are used for measuring and converting the resistance change of the sensor assembly;
and the scale pan is arranged above the first strain gauge sensor.
Further, in the strain gauge electronic balance, the model of the a/D converter is CS5552.
Further, in the strain gauge electronic balance, the weight of the built-in weight ranges from 100g to 300g.
Further, in the strain gauge electronic balance, the model of the sensor assembly is HBM300MHXVH1b 04W.
Further, in the strain gauge electronic balance, the resistance value of the sensor assembly is 350 Ω.
Furthermore, the invention also discloses a correction method of the strain gauge electronic balance, which comprises the following steps:
placing the base on a horizontal plane;
when the second strain gauge sensor is not loaded with a built-in weight, recording a zero point internal code value of the second strain gauge sensor;
loading the weight onto the second strain gauge sensor, recording a calibrated internal code value of the weight after the weight is stabilized, wherein the data of subtracting the zero internal code value from the calibrated internal code value is the actual internal code value of the loaded weight;
starting a compensation program, wherein a horizontal adjusting knob is arranged on the balance, horizontal bubbles of the electronic balance are sequentially deflected to four oblique angles through the horizontal adjusting knob, weights with 2/3 balance range are placed at the right center position of the scale pan, and the difference between the electronic balance reading and the weight of the correct weights is recorded;
after the weights on the scale pan are unloaded, the electronic balance reads the zero point internal code value of the second strain gauge sensor;
loading the built-in weights again, recording the internal code difference caused by the level and the weight difference caused by the non-level, repeating the steps for a plurality of times, and averaging a plurality of groups of data to obtain the level difference;
the difference from the level measured by the second strain gauge sensor is calculated from the value of the resistance change and the weight measured by the first strain gauge sensor is corrected proportionally.
Further, in the method for correcting the strain gauge electronic balance, the base is placed on a horizontal plane, the first strain gauge sensor and the second strain gauge sensor are located on the same horizontal plane, and therefore the scale pan is ensured to be in a horizontal state, and the first strain gauge main sensor is calibrated linearly by adopting multiple points.
Further, in the method for correcting the electronic balance with the strain gauge, the step of loading the weight onto the second strain gauge sensor is that the support arm is provided with a lifting mechanism, the built-in weight is controlled to be loaded or unloaded from the second strain gauge sensor through lifting of a micro motor, the lowest descending point of the motor is the position where the weight is fully loaded onto the second strain gauge sensor, and the highest ascending point of the motor is the position where the built-in weight is fully unloaded from the second strain gauge sensor.
Further, in the correction method of the strain gauge electronic balance, the mass of the built-in weight is 2/3 of the full range of the second strain gauge sensor.
The technical scheme can be seen that the invention has the following beneficial effects:
according to the strain gauge electronic balance, the built-in weights are adopted for horizontal and gravity correction, external weights are not needed, the resistance changes of the first strain gauge sensor and the second strain gauge sensor are measured through the two A/D converters, the mass of an object can be accurately calculated and corrected according to the values of the resistance changes, the influence of the horizontal and gravity is eliminated, the complexity and the cost of the balance are reduced, a sensor assembly and the two A/D converters are utilized, a more accurate mass measurement result can be provided, the weight of the needed weights is reduced, the electronic balance can be more easily carried and used, and the manufacturing and maintenance cost is lower.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall structure of a strain gauge electronic balance in an embodiment of the invention;
FIG. 2 is a schematic diagram of the wiring of an A/D converter and sensor assembly according to an embodiment of the present invention;
fig. 3-6 are schematic diagrams of four cases of horizontal bubble displacement of a strain gauge electronic balance in an embodiment of the invention.
Reference numerals of the above drawings: 1. a base; 2. a support arm; 3. a first strain gauge sensor; 4. a second strain gauge sensor; 5. a weight is arranged in the container; 6. a scale pan; 7. an A/D converter; 8. horizontal bubble; 9. an inner ring.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and to distinguish between similar objects, and there is no order of preference between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The present invention will be described in detail with reference to the accompanying drawings and examples.
Examples
Referring to fig. 1 to 6, the present embodiment provides a strain gauge electronic balance for accommodating a battery module, comprising:
a base 1;
a support arm 2, the support arm 2 is mounted on the base 1 and is used for supporting the weight of a measured object;
the sensor assembly comprises a first strain gauge sensor 3 for measuring the weight of an object placed on the scale pan 6 and a second strain gauge sensor 4 for correcting the horizontal deviation and the difference between the gravity and the calibration, and the first strain gauge sensor 3 and the second strain gauge sensor 4 are arranged on the upper surface of the base 1 in parallel; the strain gauge is an element formed by a sensitive grating and the like and used for measuring strain, the first strain gauge sensor 3 is a large strain gauge sensor and used for detecting the weight of a measured object, and the second strain gauge sensor 4 is a small strain gauge sensor and used for correcting the difference between horizontal deviation and calibration; the strain gauge sensor has the characteristics of high precision and high stability, and can improve the measurement precision.
A built-in weight 5, the built-in weight 5 being mounted on the support arm 2, and the support arm 2 being capable of loading the built-in weight 5 onto the second strain gauge sensor 4; the weight caused by gravity and incomplete level is measured by using the built-in weight 5 with small weight and is different from the original value before leaving the factory, and the difference is detected for correction;
two a/D converters 7 directly connected to the first and second strain gauge sensors 3 and 4, respectively, for measuring and converting the resistance change of the sensor assembly; the A/D converter is connected with a singlechip system, and the singlechip system uses an LCD display screen;
the scale pan 6, the scale pan 6 sets up the top of first foil gage sensor 3, and the object of awaiting measuring is placed on the scale pan 6, and the resistance measurement of first foil gage sensor 3 can change weight display to the LCD screen of electronic balance.
Specifically, in the present embodiment, the a/D converter 7 is CS5552.
Specifically, in this embodiment, the weight of the built-in weight 5 is 100 g-300 g, so that the weight of the required weight is reduced, and the balance is easier to carry and use.
Specifically, in this embodiment, the sensor assembly is HBM300MHXVH1b04W, the resistance value of the sensor assembly is 350 Ω, the maximum resistance change is 0.5 Ω, and small resistance changes can be accurately measured.
When the strain gauge electronic balance of the embodiment is used for mass measurement, the balance is firstly placed on a horizontal surface, then the resistance changes of the first strain gauge sensor 3 and the second strain gauge sensor 4 are measured through the two A/D converters 7, the mass of an object can be accurately calculated and corrected according to the values of the resistance changes, and the influence of the level and the gravity is eliminated. Compared with the traditional balance, the strain gauge electronic balance of the embodiment adopts the built-in weight 5 for horizontal and gravity correction, does not need an external weight, reduces the complexity and cost of the balance, can provide more accurate mass measurement results by utilizing the sensor component and the two A/D converters 7, reduces the weight of the required weight, can be more easily carried and used, and has lower manufacturing and maintenance cost.
The embodiment also discloses a correction method of the strain gauge electronic balance, which comprises the following steps:
placing the base 1 on a horizontal plane;
when the second strain gauge sensor 4 is not loaded with the built-in weight 5, recording a zero point internal code value of the second strain gauge sensor 4;
loading the weight onto the second strain gauge sensor 4, recording a calibrated internal code value of the weight after the weight is stabilized, wherein the data of subtracting the zero internal code value from the calibrated internal code value is the actual internal code value of the loaded weight;
starting a compensation program, wherein a horizontal adjusting knob is arranged on the balance, a horizontal bubble 8 of the electronic balance is sequentially deflected to four oblique angles through the horizontal adjusting knob according to the figures 3-6, a weight with a 2/3 balance range is arranged at the right center position of the scale pan 6, and the difference between the electronic balance reading and the weight of the right weight is recorded;
after the weight on the scale pan 6 is unloaded, the electronic balance reads the zero point internal code value of the second strain gauge sensor 4;
loading the built-in weight 5 again, recording the internal code difference caused by the level and the weight difference caused by the non-level, repeating the steps for a plurality of times, and averaging a plurality of groups of data to obtain the level difference;
the difference from the level measured by the second strain gauge sensor 4 is calculated from the value of the resistance change and the weight measured by the first strain gauge sensor 3 is corrected proportionally.
The horizontal bubble 8 is used for correcting errors caused by the horizontal when different X/Y axes are inclined at different angles, error values are recorded as correction consideration, and the horizontal bubble 8 is adjusted to the central position as much as possible when the electronic balance is used in the future, so that the horizontal bubble 8 falls into at least the inner ring 9.
Specifically, in this embodiment, in the step of "placing the base 1 on a horizontal plane", the first strain gauge sensor 3 and the second strain gauge sensor 4 are on the same horizontal plane, so as to ensure that the scale pan 6 is in a horizontal state, and the first strain gauge main sensor is calibrated by using a multipoint line.
Specifically, in this embodiment, in the step of "loading the weight onto the second strain gauge sensor 4", the arm 2 is provided with a lifting mechanism, the built-in weight 5 is controlled to be loaded or unloaded from the second strain gauge sensor 4 by lifting by a micro motor, the lowest point of the motor descent is the position where the weight is fully loaded onto the second strain gauge sensor 4, and the highest point of the motor ascent is the position where the built-in weight 5 is fully unloaded from the second strain gauge sensor 4.
Specifically, in this embodiment, the mass of the built-in weight 5 is 2/3 of the full scale of the second strain gauge sensor 4, and the correction of gravity and level is measured by loading and unloading the balance when the balance is started.
When a small balance measures the mass of an object, the influence of the gravity of the earth on the measurement result needs to be considered, and corresponding correction and compensation are carried out, so that the gravity field of the earth is not completely uniform, and small differences exist in the gravity acceleration of different places, and the differences may cause measurement errors of the balance. Therefore, before the balance is used, gravity correction can be performed once to improve measurement accuracy. The method comprises the steps of measuring the weight of the small-weight built-in weight because of gravity and incomplete level to be different from the original value before delivery, and detecting the difference to correct the weight; generally, gravity detection and compensation are automatically performed once every time the machine is started, so as to reduce errors caused by different gravity and calibration time. The micro strain of the elastic element is determined by utilizing the variable quantity of the resistance value of the strain gauge sensor, so that the magnitude of force is determined by utilizing the relation among force, hand area and strain, the mass of an object generating acting force is obtained, the elastic element in the sensor senses the gravity of the object and converts the gravity into the resistance change of the strain gauge, and the weighing of the mass of an object can be realized by changing the voltage into the mass on the LCD display screen of the electronic balance through the linear relation between the output voltage of the circuit and the standard weight.
The principle and the implementation mode of the invention are explained by applying specific examples, and the above examples are only used for helping to understand the technical scheme and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (9)
1. A strain gauge electronic balance, comprising:
a base;
the support arm is arranged on the base and used for supporting the weight of a measured object;
the sensor assembly comprises a first strain gauge sensor for measuring the weight of an object placed on the scale pan and a second strain gauge sensor for correcting the horizontal deviation and the difference between gravity and calibration, and the first strain gauge sensor and the second strain gauge sensor are arranged on the upper surface of the base in parallel;
the built-in weight is arranged on the support arm, and the support arm can load the built-in weight onto the second strain gauge sensor;
the two A/D converters are respectively connected with the first strain gauge sensor and the second strain gauge sensor and are used for measuring and converting the resistance change of the sensor assembly;
and the scale pan is arranged above the first strain gauge sensor.
2. The strain gauge electronic balance of claim 1, wherein the a/D converter is model CS5552.
3. The strain gauge electronic balance of claim 1, wherein the weight of the built-in weight ranges from 100g to 300g.
4. The strain gauge electronic balance of claim 1, wherein the sensor assembly is of the type HBM300MHXVH1b 04W.
5. The strain gauge electronic balance of claim 1, wherein the sensor assembly has a resistance value of 350 Ω.
6. A method of modifying an electronic balance using a strain gauge according to any one of claims 1 to 5, comprising the steps of:
placing the base on a horizontal plane;
when the second strain gauge sensor is not loaded with a built-in weight, recording a zero point internal code value of the second strain gauge sensor;
loading the weight onto the second strain gauge sensor, recording a calibrated internal code value of the weight after the weight is stabilized, wherein the data of subtracting the zero internal code value from the calibrated internal code value is the actual internal code value of the loaded weight;
starting a compensation program, wherein a horizontal adjusting knob is arranged on the balance, horizontal bubbles of the electronic balance are sequentially deflected to four oblique angles through the horizontal adjusting knob, weights with 2/3 balance range are placed at the right center position of the scale pan, and the difference between the electronic balance reading and the weight of the correct weights is recorded;
after the weights on the scale pan are unloaded, the electronic balance reads the zero point internal code value of the second strain gauge sensor;
loading the built-in weights again, recording the internal code difference caused by the level and the weight difference caused by the non-level, repeating the steps for a plurality of times, and averaging a plurality of groups of data to obtain the level difference;
the difference from the level measured by the second strain gauge sensor is calculated from the value of the resistance change and the weight measured by the first strain gauge sensor is corrected proportionally.
7. The method of claim 6, wherein the step of positioning the base on a horizontal plane, wherein the first and second strain gauge sensors are on the same horizontal plane, ensures that the scale pan is in a horizontal state, and calibrates the first strain gauge main sensor using multiple points of linearity.
8. The method according to claim 6, wherein the step of loading the weight onto the second strain gauge sensor is performed, the arm is provided with a lifting mechanism, the built-in weight is controlled to be loaded or unloaded from the second strain gauge sensor by lifting the micro motor, the lowest point of the motor descending is the position where the weight is fully loaded onto the second strain gauge sensor, and the highest point of the motor ascending is the position where the built-in weight is fully unloaded from the second strain gauge sensor.
9. The method of claim 6, wherein the mass of the built-in weight is 2/3 of the full scale of the second strain gauge sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311818049.3A CN117782274A (en) | 2023-12-27 | 2023-12-27 | Strain gauge electronic balance and correction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311818049.3A CN117782274A (en) | 2023-12-27 | 2023-12-27 | Strain gauge electronic balance and correction method thereof |
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| Publication Number | Publication Date |
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| CN117782274A true CN117782274A (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311818049.3A Pending CN117782274A (en) | 2023-12-27 | 2023-12-27 | Strain gauge electronic balance and correction method thereof |
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| Country | Link |
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| CN (1) | CN117782274A (en) |
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- 2023-12-27 CN CN202311818049.3A patent/CN117782274A/en active Pending
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