JP4508398B2 - Electronic balance - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic balance. More specifically, the weight detection data from a load detection mechanism is subjected to data processing using a method selected from a plurality of data processing methods stored in advance to determine a measurement value. It relates to electronic balances. The present invention is a load detection mechanism including a load sensor such as a load cell in addition to a so-called electronic balance that generates an electromagnetic force that counteracts the load on the plate and detects the load on the plate from the magnitude of the generated electromagnetic force. It is applicable also to what is called an electronic balance provided with.
[0002]
[Prior art]
In an electronic balance or an electronic balance (hereinafter simply referred to as an electronic balance), generally, a dish is engaged with a load detection mechanism, a load acting on the dish is detected by the load detection mechanism, and the detected data is detected by a microcomputer or the like. This is taken into the calculation means every time and subjected to data processing such as averaging processing and digital filter processing, and then converted into a weight value to determine a measurement value to be displayed on the display.
[0003]
The data processing of the load data is mainly intended to prevent the measurement display value from becoming unstable due to fluctuations in the load data caused by vibrations in the balance installation environment, depending on the balance installation environment. Data processing is required.
[0004]
Therefore, in many conventional electronic balances, a plurality of types of data processing programs are stored in advance, and an arbitrary program can be selected from them.
[0005]
[Problems to be solved by the invention]
By the way, in the electronic balance in which a plurality of types of data processing programs as described above can be selected, the user of the electronic balance selects a data processing program to be used according to the installation environment. However, whether or not the data processing program selected by the user in this way corresponds to the installation environment of the electronic balance can be determined only by whether or not the weighing display value is stable. However, it is unclear whether the installation environment and the selected data processing program are the optimal combination.
[0006]
In addition, when the weighing display value is unstable, the user changes the data processing program as appropriate, but whether it is caused by the installation environment or the failure of the device is determined by the user. The fact is that it is not possible to determine whether the determination is correct or not by investigating separately.
[0007]
The present invention has been made in view of the above points, and it is possible to always select an optimum data processing program for an installation environment from among a plurality of types of stored data processing programs. The purpose of the present invention is to provide an electronic balance capable of notifying whether the displayed value is caused by an installation environment or a device failure when the displayed value is not stable.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the electronic balance of the present invention takes in load data detected by a load detection mechanism that detects a load on the pan every moment, and the load data is stored in advance in a plurality of types of data. In the electronic balance that determines the weighing value of the load on the pan by performing data processing using the one selected from the processing programs, the time-lapse of the load data set in advance corresponding to each of the above data processing programs The load data for a certain period of time detected by the load detecting mechanism and the storage means for storing the static change pattern, and the temporal change pattern is compared with the pattern stored in the storage means to match or similar If a pattern exists, the data processing program corresponding to that pattern is automatically selected to determine the weighing value. A data processing method automatic selection means to be provided, and a failure diagnosis means that operates when there is no matching or similar pattern, determines whether or not there is a device failure, and notifies the result (claim) 1).
[0009]
Further, in the present invention, the data processing method automatic selection means matches or resembles any of the patterns stored in the storage means with the temporal change pattern of the load data for a certain time detected by the load detection mechanism. And when it is determined by the failure diagnosis means that there is no device failure, a new data processing program is created, and when the load data is processed using the data processing program, the weighing display value is stable, The data processing program may be newly stored in the storage means together with the time-dependent change pattern of the load data for the predetermined time (claim 2).
[0010]
In the present invention, corresponding to a plurality of types of data processing programs for processing the load data to determine the measurement value, a time-dependent change pattern of the load data suitable for using each data processing program is stored. In actual measurement, the stored pattern is compared with the time-dependent change pattern of the measured load data for a certain period of time. Automatically select a processing program. Also, if there is no matching or similar pattern in the above comparison, the stored data processing program cannot handle it. In this case, the automatic diagnosis means for failure is operated to determine whether there is a device failure. Then, the result is notified.
[0011]
By having the above functions, it is possible to always select the optimum data processing program corresponding to the installation environment from the stored data processing programs without requiring the judgment of the balance user. Even in the case where the device cannot be operated, the user can know whether or not there is a device failure.
[0012]
Further, in the invention according to claim 2, if the time-dependent change pattern of the actually measured load data does not match or resembles any of the change patterns in the storage device and is not a failure, a new data processing program is provided. Creates and processes load data, and adds a function to newly store the data processing program in the storage means in association with the measured load data change pattern when the measured value is stabilized. By adding this function, a data processing program corresponding to a new environment is automatically created, and it becomes possible to gradually widen the range of environments that can be handled.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.
[0014]
The load detection mechanism 1 is, for example, an electromagnetic force balance mechanism, and generates an electromagnetic force that keeps the balance against the load on the plate 1a supported by the load sensitive portion. A voltage signal corresponding to the magnitude of the current required for generation is output as a load detection signal. The load detection signal is digitized by the A-D converter 2 and then taken into a one-chip microcomputer 3 mainly composed of a CPU every predetermined minute time. The one-chip microcomputer 3 is connected to a storage device 4 and a display 5 for displaying a measured value and the presence / absence of a failure described later.
[0015]
The storage device 4 includes a plurality of types of data processing programs for processing the load data taken in via the A-D converter 2, load data change patterns corresponding to the data processing programs, and operations shown below. The one-chip microcomputer 3 displays a measured value corresponding to the load on the dish 1a on the display 5 while controlling each peripheral device according to this program.
[0016]
FIG. 2 is a flowchart showing the contents of the program for the operation.
When the apparatus is energized, first, the data processing program selected at the time of the previous measurement is read out, and the data processing program is set as a data processing program for load data used at the time of the weighing operation. The loading of the load data from the digitized load detection mechanism 1 is started. The fetched load data is stored in a buffer that stores a predetermined number of data set in advance. The load data in this buffer is discarded every time the latest load data is fetched, so that the latest predetermined number of load data is always stored in time series in this buffer. . Each time the latest load data is stored in the buffer, it is determined whether or not the load data in this buffer is stable, that is, whether or not each data value is within a certain range. If the data processing program is set, data processing such as averaging the load data in the buffer is performed, and then converted into a weight value and displayed on the display 5 as a measured value. To do.
[0017]
When it is determined that the load data in the buffer is unstable, the change patterns of the plurality of load data stored in the storage device 4 are read and compared with the temporal change patterns of the load data in the buffer. Among the change patterns stored in the storage device 4, if there is a change pattern with time of the load data in the buffer, that is, a change pattern that matches or resembles the change pattern with time of the latest predetermined number of load data, the change pattern The data processing program stored in the storage device 4 is read out in response to the above, and the data processing program is newly set as the data processing program used during the weighing operation. Thereafter, the load data in the buffer is read using the data processing program. Is processed, converted into a weight value, and displayed on the display 5 as a measured value.
[0018]
Further, when it is determined that the load data in the buffer is unstable and the change pattern of the load data in the buffer does not match or similar to any of the change patterns in the storage device 4, a device failure is checked. . The method of checking the failure is not particularly limited. For example, whether the load data in the buffer fluctuates at a fast cycle that does not appear in a normal environment, or whether the fluctuation range is abnormally large. Furthermore, it is possible to check the failure of the A-D converter 2 by exchanging signals between the A-D converter 2 and the one-chip microcomputer 3. When the determination is made, a display indicating that a device failure has occurred is displayed on the display 5 to notify the measurer.
[0019]
When it is determined that there is no failure, the load data change pattern in the buffer is stored in the storage device 4, the data processing method selection is displayed on the display device 5, and the data stored in the storage device 4 is displayed. A new data processing program different from the processing program is created. This is because, for example, data processing of the load data in the buffer is performed while creating a new data processing program in which coefficients and the like in a plurality of data processing programs stored in the storage device 4 are appropriately changed. If a stable data processing program can be created, the data processing program is stored in the storage device 4 in correspondence with the load data change pattern previously stored, and thereafter the data processing program is used for weighing. And the display during selection of the data processing program is erased, and the normal weighing operation is resumed.
[0020]
The above operation automatically selects the data processing program according to the balance's installation environment without requiring the balance's user's judgment, and the user has the trouble of selecting a failure and selecting / setting the data processing program. In addition, it is possible to obtain a stable measurement display value at all times.
[0021]
In the above embodiment, the time-dependent change pattern of the latest predetermined number of load data stored in the buffer is any of the load data change patterns corresponding to a plurality of types of data processing programs stored in advance. Although an example in which a new data processing program is created and added to the storage device when they do not match or are similar and is not diagnosed as a failure has been shown, the present invention is limited to this However, if there is no matching or similar pattern in the storage device and there is no failure, it is possible to adopt a configuration that prompts the user to change the installation environment by displaying that fact.
[0022]
In the above embodiment, an example in which the present invention is applied to an electronic balance equipped with an electromagnetic force balancing mechanism has been shown. However, the present invention is equally applicable to an electronic balance equipped with a load sensor such as a load cell. Of course, it can be applied.
[0023]
【The invention's effect】
As described above, according to the present invention, a change pattern with time of load data is compared with a change pattern stored in advance in a storage device in association with a plurality of data processing programs. For example, a data processing program corresponding to the pattern is automatically set and the weighing operation is performed.If there is no matching or similar pattern, the failure diagnosis is activated to determine whether there is a failure. The user does not need to select a data processing program that would be suitable according to the installation environment as in the past, and a suitable data processing program is always automatically selected and the correct weighing value is displayed. At the same time, since the failure diagnosis program operates when it cannot be selected, the cause is a device failure when the weighing display value is unstable. Or the user does not need to be determined by whether the installation environment thing.
[0024]
Further, as in the invention according to claim 2, when the change pattern of the load data does not match or resembles that already stored, a new data processing program is created, which stabilizes the weighing display value. If possible, if the data processing program is newly stored together with the load data change pattern, the types of installation environments that can be dealt with can be sequentially increased.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.
FIG. 2 is a flowchart showing the contents of an operation program written in the storage device 4 according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Load detection mechanism 1a Dish 2 A-D converter 3 One-chip microcomputer 4 Memory | storage device 5 Display

Claims (2)

The load data detected by the load detection mechanism that detects the load on the pan is taken in every moment, and the load data is processed using data selected from a plurality of pre-stored data processing programs. In an electronic balance that determines the weighing value of the pan load,
Storage means for storing a time-dependent change pattern of load data stored in advance corresponding to each of the data processing programs, and load data for a predetermined time detected by the load detection mechanism, and the time-dependent change pattern Compared with the pattern stored in the storage means, and if there is a match or similar pattern, the data processing program corresponding to that pattern is automatically selected and used to determine the measurement value An electronic balance comprising a processing method automatic selection means and a failure diagnosis means that operates when there is no matching or similar pattern and determines whether there is a device failure and notifies the result. The data processing method automatic selection means is such that the time-dependent change pattern of the load data for a certain time detected by the load detection mechanism does not match or resembles any of the patterns stored in the storage means, and the failure diagnosis When it is determined by the means that there is no device failure, a new data processing program is created, and when the weight display value is stabilized when the load data is processed using the data processing program, the data processing program is The electronic balance according to claim 1, wherein the electronic balance is newly stored in a storage unit together with a temporal change pattern of load data for a predetermined time.

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