JPH0339620A - Combination weighing device - Google Patents

Abstract

PURPOSE:To improve the accuracy and reliability by testing data of a 1st and a 2nd weight data area which are sampled at different points of time. CONSTITUTION:Weight signals from weight detectors provided to weighing units 21 - 25 are inputted to an A/D converter 31 through a multiplexer 30. Then a weight monitor device 40 outputs a gate switching signal to the multiplexer 30 at signal input timing, the signal from the converter 31 is processed, and the input signal is stored in a data storage circuit 41. Here, two weight data which has a constant time difference among the weight signals of the units 21 - 25 are stored in the 1st and 2nd booster hopper weight data storage areas of the circuit 41. Further, the combination arithmetic processor 43 calculates the best based on the target data from an input device 44 and the data from the circuit 41. Further, when the difference between the calculation result and the target data is not within a specific range, defect processing is carried out. Consequently, the influence of disturbance upon the weighting result is reduced and the weighing accuracy and reliability are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention randomly distributes small pieces of articles to a plurality of weighing units so that the total weight of the plurality of weighing units becomes a target weight. The present invention relates to a combination weighing device that can be combined.

(Prior art) A unit is selected so that the weight data of a plurality of weighing units randomly loaded with articles becomes a target weight, and only the articles of the selected unit are discharged, while the next article is placed in the empty unit. A combination weighing device in which the above process is repeated after the weighing process is repeated has the advantage of being able to weigh small pieces of articles in a short period of time and with high precision.

However, since one empty weighing machine is loaded with the next article, the number of weighing units that can be effectively used next time is limited, and there is a disadvantage that the original accuracy cannot be fully utilized.

In order to eliminate this inconvenience, a booster hopper is installed below the weighing unit, and the items in the weighing unit and the items stored in the booster hopper are combined to maintain the number of items that can be combined next time to maintain accuracy. The following has been proposed.

According to such a device, it is possible to combine the weights of articles stored in both the weighing unit and the booster hopper, thereby improving the weighing accuracy.

By the way, combination weighing devices are generally installed at manufacturing sites.
Since it is used in an environment where it is easily subjected to external vibrations, if external vibrations are received when capturing the weight signal, the weight signal will contain an error, which will reduce the measurement accuracy. be.

For this reason, the optimal weighing machine is selected by taking in the weight signals from the weighing units and performing a combination calculation, while at the same time, when the article is discharged from the selected weighing machine, another weighing signal is taken in. , it is determined whether the difference from the previous weight signal is within the allowable range or not.

(Issue 1m to be solved by the invention) According to such a method, while it is possible to manage with high precision the combinations of only the articles input into the weighing machine, on the other hand, the weight data stored in the booster hopper can be managed with high precision. There is a problem that it is not possible to test the

The present invention has been made in view of these problems, and its purpose is to provide a novel combination weighing device llv that can ensure the reliability of the entire system.
! It is about providing.

(Means for Solving the Problems) In order to solve these problems, in the present invention, the weight of the articles discharged into the booster hopper is reduced by at least 2
A first weight data recording area sampled at two different times and stored in correspondence with the booster hopper;
A storage means having a weight data storage area, and when a quantitative combination is performed, calculations are performed based on the weight data in the first weight data area or the second weight data area, and after the combination calculation is completed, the second or first weight is Means for verification based on the weight data of the data area is provided.

(Function) In order to verify the data of the first weight data area and the second weight data area w4 collected at different times, if the weighing unit is subjected to disturbance and an error occurs, it is reliably detected and To perform re-weighing and enable highly accurate and reliable measurement.

(Example) The details of the present invention will be described below based on illustrated examples.

FIG. 2 shows an embodiment of the combination metering and feeding device used in the present invention, and the reference numeral 1 in the figure indicates a plurality of radially arranged small pieces of articles distributed in all directions. This is a vibration conveyance type distribution table that randomly supplies articles to the weighing sections 2.2.2... Reference numeral 2 denotes a weighing section provided around the outer periphery of the dispersion table, and each section is configured by disposing a dispersion supply device 3, a pool hopper 4, a weighing unit 5, and a booster hopper 6 in order from the top.

The pool hopper 4 is equipped with a pool hopper gate 4a at a lower discharge port, and is configured to discharge the article when the article is put therein and the lower weighing unit 5 is filled.

The weighing unit 5 has first and second cages 7 that open in two directions.
a, the weighing hopper 7 equipped with 7 tl is attached to the weight detection device 110 installed on the base 9, and the booster hopper 6 or the collecting chute 11 is selected by selecting the gates 7a and 7b.
The article is configured to be discharged to either one of the two.

FIG. 1 shows an embodiment of a control device for controlling the operation of the above-mentioned quantitative supply mechanism, and reference numerals 21 to 25 in the figure are measuring units constituting the measuring device. The weight signal from the provided weight detector is sent to the multiplexer 301! The signal is input to the analog-to-digital converter 31 via the gate, and the gate is opened and closed by a signal from the drive control device 132.

Reference numeral 40 denotes a weight monitoring device consisting of a microcomputer that processes signals from the analog-to-digital converter 31, outputs a gate switching signal to the multiplexer 30 in accordance with the signal acquisition timing, and also outputs a gate switching signal to the multiplexer 30 at the same time as the data storage circuit 41, which will be described later. is configured to store an input signal.

41 is the data storage circuit described above, and as shown in FIG.
A weighing hopper weight data storage area 52 stores weight data from the weighing units 21 to 25 in correspondence with the area pA51, and a booster hopper ID area 53 of the booster hopper attached to each weighing unit stores weight data at different times. The first booster hopper weight data storage area 54 and the second booster hopper weight data storage area tt455 are provided.

Returning to FIG. 1 again, reference numeral 42 in the figure is a state memory circuit that stores the state of each weight hopper.
It is configured to set a stable flag and an empty flag in accordance with the D area.

43 is a combinational arithmetic processing device consisting of a microcomputer, which is equipped with a combinatorial arithmetic processing program, and has an input table W4.
The optimum combination is calculated based on the target data from 4 and the data from the data storage circuit 41. Note that the reference numeral 45 in the figure indicates an external bag W1 of a packaging machine or the like.

Next, the operation of the apparatus configured as described above will be explained based on the flowchart of FIG. 4.5.

The weight monitoring device 40 operates the multiplexer 30% at a predetermined period, e.g., 1.5 milliseconds, regardless of the state of the weighing unit, that is, when the article is being fed or discharged, to display one weighing unit, e.g., the weighing unit. 21 (FIG. 4A), compares the captured weight signal with the previous weight signal (weight data stored in the weighing hopper weight data storage area 52 of the data storage circuit 41), Calculates whether the difference between the two is within a certain range or not, and determines whether the weight data of the weighing unit 21 currently being sampled is stable or not (mouth); As a result of the stability judgment, if the weight data is stable (c), the weight data of the weighing unit 21 just sampled is stored in the weighing hopper weight of the data storage circuit 41 in correspondence with the ID of this weighing unit 21. Data storage 9111tt521 is stored (2). On the other hand, if the weight data does not reach the stable state sf (c),
Reset stability flag (nu).

When the weight data has been stored in the weighing hopper weight data storage area 52, the booster hoppers 6, 6, 6, . . . attached to the weighing unit 21 that has stored the weight data are then
・Check the condition of booster hopper 6.6.6...
is empty and the gate is closed and the weighing hopper 7.
7. Determine whether it is possible to accept the goods from 7... (e).

As a result, if the booster hopper 6.6.6... can receive goods, it is investigated whether the stability flag is set, and if the stability flag is not set, go to , set the stability flag), then start the timer (ch), and set the weighing unit 21.
The weight data, that is, the data in the weighing hopper weight data storage area 52, is stored in the first booster hopper weight data storage area 53.

On the other hand, if the stability flag is already set (
), wait for the timer to time up (l), and store the weight signal from the weighing unit 21 in the second booster hopper weight data storage area (e). After a while 2
The weight data will be stored in the first and second booster hopper weight data storage areas 53 and 54. this(
Therefore, if a disturbance occurs when the weight data of the articles stored in the booster hoppers 6, 6, 6, etc. is taken in, a difference will occur.

At the stage where the two weight data are stored, the booster hopper 6.6.6 attached to this weighing hopper 21...
Set a command to eject the item (wa). However, when the sampling operation for one weighing unit 21 is completed, the weight monitoring device f40 designates the next weighing unit, for example, the weighing unit 22, and repeats the above-mentioned process to sequentially import the weight data ( Power)
.

On the other hand, the combination arithmetic processing unit M42 calculates the weight of the weighing hoppers 7.7.
Activate the booster hopper 6.6.6.
(Figure 5 A) - 1 Empty weighing hopper 7. 7. 7.
．． 4. Supply goods from 4... (mouth). This process is repeated until a start signal is input from the packaging machine 45 (c).

In this way, when the signal from the packaging machine 45 is input (
c) The combinational arithmetic processing device 43 includes a weight monitor device fl.
At t40, a weight data transfer request command is output.

The weight monitor device 140 stores the weight data stored in the weighing hopper weight data storage area 52 of the data storage circuit 41, the flag information accompanying this, and the first
, 2nd booster hopper weight data storage area t*53.5
The weight data stored in one of 4 is transferred to the combinational arithmetic processing device 42.

The combination processing unit 42 selects only the weight data whose stability flag is set from among the transferred weight data, and targets the selected weight data and the data in the one booster hopper weight data storage area 53. Perform combinatorial operations on (2).

This combination calculation is performed by, for example, updating the previously stored combination data to a new combination when a combination of data is randomly combined to produce a value closer to the target value.

In this way, when the final combination result is obtained, the combination (calculate the difference between the weight and the target value, and if it is greater than or equal to the target value and within a predetermined range, select this combination. (e) If the optimal combination does not exist, the process is repeated by repeating the above process by adding a few items, such as using multiple weighing hoppers (e.g. three weighing hoppers). changes, so the probability of obtaining an optimal combination result increases.

When the combinational calculation is completed, the combinational calculation processing device 42
In the process of this combination calculation, the weight data is newly sampled and stored in the weighing hopper weight data storage area 52, and the other booster hopper selected for the combination, that is, the second booster hopper weight data storage area 5.
Request the transfer of the weight data of No. 4, and calculate the total value again using these weight data (to).

If the difference between this calculation result and the target value is positive and within a predetermined range (g), the selected weighing hopper 7.7.7... and booster hopper 6. 6
．． 6... are discharged into the collection chute 11 and supplied to the packaging machine 45 (H).

On the other hand, if the difference between the calculation result and the target value is outside the predetermined range (g), there is a possibility that a disturbance may have occurred when the weight signal was taken in from the weighing unit 5.5.5... So,
By performing defect processing, it is possible to reduce as much as possible the influence of disturbances mixed into the measurement results, and to ensure high measurement accuracy and high reliability.

Thereafter, such a process is repeated to continuously weigh the articles.

(Effects of the Invention) As described above, in the present invention, there is provided a first weight data storage area in which the weight of the article discharged into the booster hopper is sampled at at least two different times and stored in correspondence with the booster hopper. , a storage means having an M2 weight data storage area, and the first
While the calculation W is executed based on the weight data in the weight data area or the second weight data area, a means is provided for performing verification based on the weight data in the second or first weight data area after the combination calculation is completed. Since the data of the first weight data area and the second weight data area that were collected at different times are used, it is possible to reliably detect errors when the weighing unit is subject to external disturbances such as vibrations. In order to improve the accuracy of the quantitative feeding device with a booster hopper,
Reliability can be improved.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention, Fig. 2 is a schematic diagram of a mechanism showing an embodiment of a hopper type quantitative feeding device used in the present invention, and Fig. 3 The figure is a schematic diagram showing the configuration of a data storage circuit in the above device, and FIG. 4.5 is a flow chart and an explanatory diagram showing the operation of the above device, respectively. 1... Distribution table 4... Pool hopper 6... Booster hopper 10... Weight detectors 21 to 25... Weighing unit 40... Arithmetic processing unit 2... 5 7... 1 Weighing section...Weighing unit...Weighing hopper...Collection chute

Claims (1)

[Claims] In a device that weighs items to a target weight by combining weight data of items stored in a plurality of weighing units and items in a booster hopper disposed below the weighing units, the weight of the items discharged into the booster hopper is calculated. a storage means comprising a first weight data storage area and a second weight data storage area for sampling at least two different times and storing them in correspondence with booster hoppers; 2. While performing calculations based on the weight data in the weight data area,
A combination weighing device comprising means for verifying based on weight data in the second or first weight data area after completion of the combination calculation.