CN112577585A - Weighing equipment, and state detection device and method of weighing sensor group - Google Patents
Weighing equipment, and state detection device and method of weighing sensor group Download PDFInfo
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- CN112577585A CN112577585A CN201910938723.9A CN201910938723A CN112577585A CN 112577585 A CN112577585 A CN 112577585A CN 201910938723 A CN201910938723 A CN 201910938723A CN 112577585 A CN112577585 A CN 112577585A
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- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
Abstract
The invention provides a weighing device, a state detection device of a weighing sensor group and a method, wherein the state detection device of the weighing sensor group comprises: the sampling circuit is arranged in a microprocessor of the weighing equipment and is connected with a constant voltage source; the method comprises the steps of obtaining actually measured sampling data; the microprocessor diagnoses the working state of the weighing equipment and further diagnoses the access quantity f (n) g (a, b) of the weighing sensors according to the ratio of the number of the corresponding weighing sensors to the preset value of the specification parameters to the actually measured data of the circuit; wherein n is the number of the weighing sensors, a is the actually measured sampling data, and b is the preset value. Through the state detection device of weighing sensor group, more detailed weighing sensor connection state information can be provided.
Description
Technical Field
The invention relates to the technical field of weighing, in particular to a weighing device, a state detection device of a weighing sensor group and a state detection method of the weighing device.
Background
In weighing applications, in order to improve weighing accuracy, a plurality of weighing sensors may be respectively disposed at different positions of the weighing apparatus. Particularly for high precision electronic weighing apparatus, more than two sensors are usually included to form a weighing sensor system, and a single weighing sensor is rarely used. For small weighing equipment, a plurality of weighing sensors are arranged, so that the influence of the weighing result on the object to be weighed due to the placement position relationship can be reduced; for large-scale weighing equipment, on one hand, the stability of the scale body can be maintained, and on the other hand, the weighing weight can be increased.
The weighing sensor is connected to the weighing instrument and detects the connection state between the weighing sensor and the weighing instrument when weighing so as to judge whether the weighing sensor works normally or not. In the existing detection method, when the connection state between a sensor group consisting of a plurality of weighing sensors and a weighing instrument is detected, the connection state information can only be displayed to the level of 'on' or 'off', so that a user can only be prompted whether the weighing sensor group is connected with the weighing instrument, and the connection state of individual weighing sensors in the sensor group cannot be detected.
For weighing equipment comprising a plurality of weighing sensors, the existing detection method can only judge the connection state of the whole sensor group and a weighing instrument, and is not beneficial to the installation, debugging, maintenance and use of a multi-sensor weighing system. Therefore, a detection method is needed to identify more detailed connection status information in the sensor group.
Disclosure of Invention
The invention aims to solve the technical problem that the display state information is limited in the existing weighing sensor state detection method, and provides a detection device and a detection method capable of providing more detailed weighing sensor connection state information.
In order to solve the above technical problem, the present invention provides a status detecting device for a weighing sensor group, comprising: the sampling circuit is arranged in a microprocessor of the weighing equipment and is connected with a constant voltage source; the method comprises the steps of obtaining actually measured sampling data; the microprocessor diagnoses the working state of the weighing equipment and further diagnoses the access quantity f (n) g (a, b) of the weighing sensors according to the ratio of the number of the corresponding weighing sensors to the preset value of the specification parameters to the actually measured data of the circuit; wherein n is the number of the weighing sensors, a is the actually measured sampling data, and b is the preset value.
Preferably, the error adjusting range is preset according to the installation of the weighing sensors, and the corresponding quantity of the weighing sensors is determined according to the error adjusting range of the ratio.
Preferably, the sampling circuit is arranged between an excitation terminal of the weighing sensor group and a constant voltage source or a ground terminal of the constant voltage source.
Preferably, the sampling circuit comprises a sampling resistor and an analog-to-digital converter; the analog-to-digital converter is used for detecting the voltage of the sampling resistor.
Preferably, the sampling circuit prompts the weighing sensor to have access error when the voltages at the two ends of the sampling resistor change.
Preferably, the obtaining of the measured sampling data by the sampling circuit includes: and acquiring the measured voltage of the sampling resistor through the analog-to-digital converter.
Preferably, the preset values corresponding to the number of the weighing sensors and the specification parameters include sampling current or sampling voltage of the sampling resistor when the weighing sensor group comprises weighing sensors with different numbers.
In order to solve the counting problem, the invention also discloses weighing equipment which comprises the state detection device of the weighing sensor group.
In order to solve the counting problem, the invention also discloses a state detection method of the weighing sensor group, which comprises the following steps: acquiring actually measured sampling data through a sampling circuit connected to a constant voltage source in a microprocessor of the weighing equipment; diagnosing the working state of the weighing equipment according to the ratio of the number of the corresponding weighing sensors, the preset value of the specification parameters and the actually measured data of the circuit; and diagnosing the access number f (n) of the weighing sensors as g (a, b); wherein n is the number of the weighing sensors, a is the actually measured sampling data, and b is the preset value.
Preferably, the sampling circuit comprises a sampling resistor and an analog-to-digital converter; the analog-to-digital converter is used for detecting the voltage of the sampling resistor; the state detection method of the load cell further includes: the sampling circuit prompts the weighing sensor to have access error when the voltages at the two ends of the sampling resistor change.
Preferably, the preset values corresponding to the number of the weighing sensors and the specification parameters include sampling current or sampling voltage of the sampling resistor when the weighing sensor group comprises weighing sensors with different numbers.
The positive progress effects of the invention are as follows:
the detection device and the detection method of the weighing sensor group can correspondingly judge the number of the weighing sensors in the current disconnection state by comparing the ratio of the actually measured sampling data obtained by the sampling circuit with the preset value and then obtaining the corresponding number of the weighing sensors in the connection state through f (n) g (a, b), thereby providing convenience for the actual installation, debugging, maintenance and use of the multi-sensor weighing system.
Certain terms are used throughout the description and claims to refer to particular system components. As one skilled in the art will appreciate, different usage objects may represent the same component by different names. Components that differ in name but not function are not distinguished herein and are intended to be within the scope of the present invention.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:
fig. 1 is a schematic structural diagram of a weighing apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a sampling unit in a state detection device of a load cell according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a sampling unit in a state detection device of another weighing sensor according to an embodiment of the invention.
Fig. 4 is a flowchart illustrating a status detection method for a load cell according to an embodiment of the present invention.
FIG. 5 is a flowchart of another method for detecting a condition of a load cell according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example 1
As shown in fig. 1, the weighing apparatus comprises a load cell group consisting of 4 load cells, and a load cell connected thereto. The power supply system of the weighing instrument weighing sensor adopts constant voltage power supply, and the weighing sensor is an analog weighing sensor.
A state detection device of a weighing sensor is integrated in a Micro Controller Unit (MCU) of the weighing instrument and comprises a sampling circuit. As shown in fig. 2, the sampling resistor and the analog-to-digital converter (AD converter) are included. The sampling resistor is arranged at the monitoring end of the constant voltage power supply. When the power supply output of the weighing instrument starts to supply power to the weighing sensor, the analog-to-digital converter detects the voltage on the sampling resistor, so that the power supply sampling of the weighing sensor group is realized.
In practical applications, the load cell is of a known type and its associated data are known, for example, a general load cell with 350 ohm impedance, i.e. the impedance of the positive and negative excitation terminals of the load cell is 350 ohm. Suppose the known excitation voltage of the load cell is U0Impedance of R0The theoretical value of the current I of a single weighing sensor0Comprises the following steps: i is0＝U0/R0. Meanwhile, because the weighing sensors are connected in parallel with each other, the current theoretical value I of a single sensor0Multiplying the number by the number m of the weighing sensors to obtain the theoretical total current I of the weighing sensor group I0M. Further, the weighing instrument multiplies the theoretical total current I of the weighing sensor group by the impedance R of the sampling resistor through the micro-control unit chipMiningAnd obtaining the theoretical voltage U of the sampling resistor: u ═ I RMining。
Through the calculation, the corresponding relation between the number m of the weighing sensors and the theoretical voltage U of the sampling resistor can be obtained. In the weighing sensor group composed of 4 weighing sensors as shown in fig. 1, the theoretical voltages U of the sampling resistors respectively corresponding to the weighing sensors with the number of the weighing sensors being 1-4 can be obtained through the calculation. Therefore, in the actual use process of the weighing device, the sampling circuit acquires the measured voltage U 'of the sampling resistor, and then the number n of the weighing sensors in the normal connection state in the current weighing sensor group can be judged by comparing the theoretical voltage U and the measured voltage U' of the sampling resistor, as shown in the following table 1. And finally, judging that a plurality of weighing sensors fail at present by comparing the difference m-n between the number n of the sensors obtained by measurement and the number m of the connected weighing sensors.
Under the influence of various factors, the actually measured voltage U' of the sampling resistor may have a relative error with the theoretical voltage U. Therefore, a certain error range is set for the theoretical voltage U corresponding to the number of the sensors, so that the number of the sensors corresponding to the actually measured voltage U' is judged. The error range is mainly determined according to field installation and debugging conditions, and can be set to an adjustable value instead of a fixed value in the operation control of the weighing instrument.
TABLE 1
As a modification of this embodiment, after the power supply of the weighing instrument outputs power to the weighing sensors, if the connection state of a certain weighing sensor changes, the impedance of the weighing sensor group changes, which causes a change in the current I and a change in the voltage on the sampling resistor. Therefore, after the AD converter finds that the voltage flowing through the sampling resistor changes, the weighing instrument end can send out prompt information that the connection state of the weighing sensor is wrong in time through the reminding device.
This embodiment 1 supplies power to a weighing sensor group by a constant voltage source and detects a voltage drop caused by a passing current by adding a sampling resistor of a small resistance value, and measures a voltage caused by a current passing through a measuring resistor by an AD converter. And for the control end of the weighing instrument, the bridge circuit impedance of the weighing sensor is obtained through the type information of the weighing sensor, so that the corresponding relation between the number of the weighing sensors and the measuring voltage of the sampling resistor is established. By comparing the relation between the sampling resistance measurement voltage U' and the theoretical calculation voltage U, whether the number of the weighing sensors connected into the weighing instrument is normal can be determined.
Compared with the existing detection device, the detection device for the weighing sensor realizes the state detection of the connection state of a single weighing sensor or a sensor group and the state detection of the number of the sensors connected into the sensor group, and is realized in a hardware mode of group end detection, so the detection device is simple and convenient to implement.
Example 2
As shown in fig. 1, the weighing apparatus comprises a load cell group consisting of 4 load cells, and a load cell connected thereto. The power supply system of the weighing instrument weighing sensor adopts a constant voltage source for supplying power, and the weighing sensor is an analog weighing sensor.
The state detection device of a weighing sensor is integrated in the MCU of the weighing instrument and comprises a sampling circuit. As shown in fig. 3, the sampling circuit includes a sampling resistor and an analog-to-digital converter (AD converter). The power supply is arranged between an excitation terminal of the weighing instrument and a power supply output and can be a positive excitation end or a negative excitation end. When the power supply output of the weighing instrument starts to supply power to the weighing sensor, the analog-to-digital converter detects the voltage on the sampling resistor, so that the power supply sampling of the weighing sensor group is realized.
In practice, the type of load cell is knownThen the relevant data is known, for example, a general 350 ohm impedance load cell, i.e. the impedance of the positive and negative excitation terminals of the load cell is 350 ohms. Suppose the known excitation voltage of the load cell is U0Impedance of R0The theoretical value of the current I of a single weighing sensor0Comprises the following steps: i is0＝U0/R0. Meanwhile, because the weighing sensors are connected in parallel with each other, the current theoretical value I of a single sensor0Multiplying the number m of the weighing sensors by the number m of the weighing sensors to obtain the theoretical total current of the weighing sensor group, namely the current I passing through the sampling resistor is I0*m。
Through the calculation, the corresponding relation between the number m of the weighing sensors and the theoretical current I of the sampling resistor can be obtained. In the weighing sensor group composed of 4 weighing sensors as shown in fig. 1, the theoretical current values I of the sampling resistors respectively corresponding to the weighing sensors with the number of the weighing sensors being 1-4 can be obtained through the calculation. Therefore, in the actual use process of the weighing equipment, the measured voltage drop U 'at two ends of the sampling resistor is obtained through the AD converter in the sampling circuit, and then the measured current value I' is obtained through the calculation of the MCU chip: i ═ U'/RMining(RMiningThe impedance of the sampling resistor), and then the number n of the weighing sensors in the normal connection state in the current weighing sensor group can be judged by comparing the theoretical current I and the actually measured current I' of the sampling resistor. And finally, judging that a plurality of weighing sensors fail at present by comparing the difference m-n between the number n of the sensors obtained by measurement and the number m of the connected weighing sensors.
Under the influence of various factors, the actually measured voltage I' of the sampling resistor may have a relative error with the theoretical voltage I. Therefore, a certain error range is set for the theoretical voltage I corresponding to the number of the sensors, so that the number of the sensors corresponding to the actually measured voltage I' is judged. The error range is mainly determined according to field installation and debugging conditions, and can be set to an adjustable value instead of a fixed value in the operation control of the weighing instrument.
As a modification of this embodiment, after the power supply of the weighing instrument outputs power to the weighing sensors, if the connection state of a certain weighing sensor changes, the impedance of the weighing sensor group changes, which causes a change in the current I and a change in the voltage across the sampling resistor. Therefore, after the voltage change is found through the AD converter, the weighing instrument end can send out prompt information that the connection state of the weighing sensor is wrong through the reminding device in time.
It can be understood by those skilled in the art that the present embodiment and the first embodiment are based on the same inventive concept, and the technical contents of the two embodiments can be combined with each other, for example, the arrangement position of the sampling circuit can also be arranged between the constant voltage power supply and the ground terminal in the manner of fig. 2 in embodiment 1. Therefore, for this embodiment, reference may be made to the corresponding contents of the first embodiment, which are not described herein again.
Example 3
The method for monitoring the state of the load cell of the present embodiment can be applied to the load cell of embodiment 1 or 2 to monitor the connection state of the load cell. A state detection device of a weighing sensor is integrated in the MCU of the weighing instrument and comprises a sampling circuit. As shown in fig. 2, the sampling circuit includes a sampling resistor and an analog-to-digital converter (AD converter).
As shown in fig. 3, the status method of the load cell includes:
and S101, calculating the corresponding relation between the theoretical voltage value of the sampling resistor and the number of the weighing sensors.
In practical applications, the type of load cell is known, and the relevant data is known. Suppose the known excitation voltage of the load cell is U0Impedance of R0The theoretical value of the current I of a single weighing sensor0Comprises the following steps: i is0＝U0/R0. Meanwhile, because the weighing sensors are connected in parallel with each other, the current theoretical value I of a single sensor0Multiplying the number by the number m of the weighing sensors to obtain the theoretical total current I of the weighing sensor group I0M. Further, the weighing instrument converts the theoretical total current I of the weighing sensor group into a total current I,resistance R multiplied by a sampling resistanceMiningAnd obtaining the theoretical voltage U of the sampling resistor: u ═ I RMining。
Through the calculation, the corresponding relation between the number m of the weighing sensors and the theoretical voltage U of the sampling resistor can be obtained. In the weighing sensor group composed of 4 weighing sensors as shown in fig. 1, the theoretical voltages U of the sampling resistors respectively corresponding to the weighing sensors with the number of the weighing sensors being 1-4 can be obtained through the calculation.
Step S102, acquiring the actually measured sampling data voltage U' of the sampling resistor.
When the power supply output of the weighing instrument starts to supply power to the weighing sensor, the AD converter detects the voltage on the sampling resistor, so that the power supply sampling of the weighing sensor group is realized.
And S103, comparing the voltage U' of the sampling resistor with the theoretical voltage U to obtain the number n of the weighing sensors corresponding to the current theoretical voltage U.
In the actual use process of the weighing equipment, the sampling circuit acquires the actually measured voltage U 'of the sampling resistor, and then the number n of the weighing sensors in the normal connection state in the current weighing sensor group can be judged by comparing the theoretical voltage U and the actually measured voltage U' of the sampling resistor.
And step S104, judging the connection state of the current weighing sensor.
And judging that a plurality of weighing sensors fail at present by comparing the difference m-n between the number n of the sensors obtained by measurement and the number m of the connected weighing sensors.
Example 4
The method for monitoring the state of the load cell of the present embodiment can be applied to the load cell of embodiment 1 or 2 to monitor the connection state of the load cell. Compared with embodiment 3, the present embodiment is different in comparison between actually measured sampling data and theoretical data of the sampling resistor, and specifically includes:
step S201, calculating the corresponding relation between the theoretical current value of the weighing sensor group and the number of the weighing sensors.
In the practical application of the method, the material is,the load cell is of a known type and its associated data is known, for example a conventional 350 ohm impedance load cell, i.e. the impedance of the positive and negative excitation terminals of the load cell is 350 ohms. Suppose the known excitation voltage of the load cell is U0Impedance of R0The theoretical value of the current I of a single weighing sensor0Comprises the following steps: i is0＝U0/R0. Meanwhile, because the weighing sensors are connected in parallel with each other, the current theoretical value I of a single sensor0Multiplying the number m of the weighing sensors by the number m of the weighing sensors to obtain the theoretical total current of the weighing sensor group, namely the current I passing through the sampling resistor is I0*m。
Through the calculation, the corresponding relation between the number m of the weighing sensors and the theoretical current I of the sampling resistor can be obtained. In the weighing sensor group composed of 4 weighing sensors as shown in fig. 1, the theoretical current values I of the sampling resistors respectively corresponding to the weighing sensors with the number of the weighing sensors being 1-4 can be obtained through the calculation. Because the weighing sensor group is connected with the sampling resistor in series, the current flowing through the weighing sensor group is the same as the current flowing through the sampling resistor.
Step S202, acquiring the actually measured sampling data current I' of the sampling resistor.
In the actual use process of the weighing equipment, the actual measurement voltage drop U 'at two ends of the sampling resistor is obtained through an AD converter in the sampling circuit, and then an actual measurement current value I' is obtained through calculation of an MCU chip: i '═ U'/R sampling (R sampling is the impedance of the sampling resistor)
Step S203, comparing the actually measured current value I' of the sampling resistor with the theoretical current I to obtain the number n of the weighing sensors corresponding to the current theoretical current I.
The number n of the weighing sensors in the normal connection state in the current weighing sensor group can be judged by comparing the theoretical current I and the actually measured current I' of the sampling resistor.
And step S204, judging the connection state of the current weighing sensor.
And judging that a plurality of weighing sensors fail at present by comparing the difference m-n between the number n of the sensors obtained by measurement and the number m of the connected weighing sensors.
The present embodiment 3 and the embodiment 4, and the embodiments 1 and 2 are based on the same inventive concept, so that the content of the present embodiment can also refer to the corresponding content of the embodiments 1 and 2, and the details are not repeated herein.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored on a computer readable medium, which may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
While the invention has been described with reference to a number of specific embodiments, it will be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the invention, and various changes in and substitutions of equivalents may be made without departing from the spirit of the invention. Therefore, changes and modifications to the above-described embodiments within the spirit and scope of the present invention will fall within the scope of the claims of the present application.
Claims (11)
1. A status detection device for a weighing sensor group, comprising:
the sampling circuit is arranged in a microprocessor of the weighing equipment and is connected with a constant voltage source; the method comprises the steps of obtaining actually measured sampling data;
the microprocessor diagnoses the working state of the weighing equipment and further diagnoses the access quantity f (n) g (a, b) of the weighing sensors according to the ratio of the number of the corresponding weighing sensors to the preset value of the specification parameters to the actually measured data of the circuit;
wherein n is the number of the weighing sensors, a is the actually measured sampling data, and b is the preset value.
2. The status detecting device of claim 1, wherein the number of load cells is determined by presetting an error adjustment range according to the installation of the load cells and determining the corresponding number of load cells according to the error adjustment range of the ratio.
3. The status detecting device of the weighing sensor group as claimed in claim 1, wherein said sampling circuit is provided between an excitation terminal of the weighing sensor group and a constant voltage source, or a ground terminal of the constant voltage source.
4. The condition detecting device of the weighing sensor group as recited in claim 1, wherein the sampling circuit comprises a sampling resistor, an analog-to-digital converter; the analog-to-digital converter is used for detecting the voltage of the sampling resistor.
5. The status detecting device of claim 4, wherein the sampling circuit indicates that the load cell is incorrectly connected when the voltage across the sampling resistor changes.
6. The condition sensing device of a load cell group as recited in claim 4, wherein the sampling circuit obtaining measured sample data comprises: and acquiring the measured voltage of the sampling resistor through the analog-to-digital converter.
7. The status detecting apparatus for a load cell group according to claim 6, wherein the predetermined values corresponding to the number of load cells and the specification parameters include a sampling current or a sampling voltage of the sampling resistor when the load cell group includes a different number of load cells.
8. A weighing apparatus comprising a condition detecting device of the weighing sensor group according to any one of claims 1 to 7.
9. A method for detecting the state of a weighing sensor group is characterized by comprising the following steps:
acquiring actually measured sampling data through a sampling circuit connected to a constant voltage source in a microprocessor of the weighing equipment;
diagnosing the working state of the weighing equipment according to the ratio of the number of the corresponding weighing sensors, the preset value of the specification parameters and the actually measured data of the circuit; and diagnosing the access number f (n) of the weighing sensors as g (a, b);
wherein n is the number of the weighing sensors, a is the actually measured sampling data, and b is the preset value.
10. The condition detecting method of a load cell according to claim 9,
the sampling circuit comprises a sampling resistor and an analog-to-digital converter; the analog-to-digital converter is used for detecting the voltage of the sampling resistor;
the state detection method of the load cell further includes: the sampling circuit prompts the weighing sensor to have access error when the voltages at the two ends of the sampling resistor change.
11. The condition detecting method of a load cell according to claim 9,
the preset values corresponding to the number of the weighing sensors and the specification parameters comprise sampling current or sampling voltage of the sampling resistor when the weighing sensor group comprises weighing sensors with different numbers.
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