JPS603525A - Weight measuring method - Google Patents

Abstract

PURPOSE:To raise a corrected measuring accuracy by an additional very small quantity supply, and to raise a measuring accuracy of the whole by adding a little smaller value than a short quantity to a measured value, when a measured value of a still and stable time after a supply has been completed is short, using the added value as a new supply completed weight, and supplying an additional very small quantity. CONSTITUTION:A large quantity supply completed weight, a very small quantity supply completed weight, and a target weight are inputted to a control part 9, respectively, from a setting part 10, and in case of a large quantity supply, a gate 4-1 is positioned at the upper state, also an amplitude of a feeder 3 is enlarged, and it is controlled to such a large quantity supply state until a measured value reaches the large quantity supply completed weight. When the measured value reaches the large quantity supply completed weight, this time, the gate 4-1 is switched to the lower stage position, also the amplitude of the feeder 3 is made small, and it is controlled to such a very small quantity supply state until the measured value reaches the very small quantity supply completed weight. In this way, when the very small quantity supply is completed, and the measured value which has become still and stable reaches the target weight, an opening/closing device 8 is operated, and a control for discharging an object to be measured in a measuring hopper 5 is executed.

Description

Detailed Description of the Invention (Industrial Application Field) This invention controls the supply flow rate of the object to be weighed to the hopper based on the amount of the object to be weighed M put into the weighing hopper, and The present invention relates to a weighing method in which the object to be weighed in the hopper is discharged when the weight reaches a target weight.

(Conventional problems) In this type of conventional weighing method, in order to reduce the measurement error due to head error, the supply of the object to be weighed is completed at a weight slightly before the target weight, and the object to be weighed falling from the supply trough is (
At the final weighing after the head error (head error) has been stored in the weighing hopper, the supply amount of the object to be weighed is controlled so that the weight of the object in the weighing hopper is approximately equal to the target weight in the positive direction.

However, since the head error varies depending on the unit weight of the object to be weighed and the state of supply, the measured value at 9:00 when the object is stationary and stable may be less than the target weight.

In such a case, an additional small amount of supply must be performed again, but the conventional additional small amount of supply is l! ! The f& meter was supplied for a set period of time.

For this reason, conventional models do not have good weighing accuracy.

Especially for those that perform large-scale weighing with high capacity.

It is necessary to increase the small amount supply flow rate, which increases the amount of head error, and there is a limit to the improvement of metering accuracy of this type of device.

(Object of the invention) This invention was made in consideration of the above circumstances, and
The purpose of the present invention is to provide a new weighing method that can improve the correction weighing (71 degrees) by adding a small amount of supply, thereby improving the overall weighing accuracy.

(Structure of the Invention) In order to achieve the above object, the present invention is characterized by having the following structure.

That is, the supply flow rate of the object to be weighed to the hopper is controlled based on the weight of the object to be weighed in the weighing hopper.

When the weight of the object to be weighed reaches the target weight, if the weight of the object to be weighed reaches the target weight, in the weighing method where the object to be weighed is discharged from the container, if the measured value when the object is stationary and stable after feeding is completed is insufficient for the target weight, the weighing The feature is that a weight value slightly less than the insufficient weight is added to the value, and the added total value is used as the completed weight for supplying an additional small amount.

(Example) Embodiments of the present invention will be described below based on the drawings.

The first part is a schematic diagram of the main parts of an apparatus for carrying out the measuring method according to the present invention.

In this figure, the supply device A includes a trough 2 whose starting end is located under the lower end of the supply hopper 1, an electromagnetic feeder 3 that vibrates the trough 2, and a gate provided near the terminal end of the trough 2. It consists of a device 4.

The gate device 4 includes an r-shaped gate 4-1 and a gate 1-4.
-1 and a cylinder 4-2 that moves the
The operation of the cylinder 4-2 creates a gap between the lower edge of the gate 4-1 and the bottom surface of the trough 2, that is.

The cross-sectional area of the passage of the object to be weighed on the trough 2 is wide and narrow 2.

It is designed so that it can be cut and handled in stages.

A metering device B is provided at the front lower part of the terminal end of the trough 2. This weighing device B has a weighing hopper 5 into which objects to be weighed are fed from the supply device A, and a load cell 6 that supports the hopper 5.

The outlet of the hopper 5 is equipped with a gate 1-7.

One end of the gate 7 is pivoted to the side of the hopper 5,
A suitable opening/closing device 8 allows the extraction port to be pivoted between a closed position indicated by a solid line and an open position indicated by a chain line.

The control unit 9 controls the supply of a large amount or small amount of the object to be weighed based on the weight value input from the load cell 6, and when the amount of the object to be weighed reaches the target weight, it stops feeding and starts weighing. This control is for discharging the object to be weighed from the bosoba 5.

That is, the control unit 9 receives the mass supply completion weight from the setting unit 10;
The completed weight of small amount supply and the target weight are respectively input, and when supplying a large amount, as shown in FIG. 2, the gate 4-
1 is placed in the upper stage, and the amplitude of the feeder 3 is increased to control the large quantity supply state until the measured value reaches the mass supply completion weight.

When the measured value reaches the mass supply completion weight, as shown in Fig. 3, the gate 4 = 1 is switched to the lower position and the amplitude of the feeder 3 is made small, so that the measured value indicates that the small quantity supply is completed. The supply is controlled in such a small amount until the weight is reached. Then, when the small amount supply is completed and the weighed value after being stabilized has reached the target weight, control is performed to operate the opening/closing device 8 to discharge the object to be weighed from the weighing hopper 5.

A chute 11 is provided at the bottom of the discharge port of the weighing hopper 5 to guide the object to be weighed into a packaging container or the like. A start signal is input to start the process.

Next, an explanation will be given of the operational flow when the measuring method according to the present invention is carried out using this embodiment device.

FIG. 4 shows an example of the operation flow of the control section 9 of this embodiment device, which is comprised of a microcomputer (hereinafter referred to as CPU 6-).

First, when a start signal is given from a switch, a packaging machine, etc., the CPU inputs the measured value W from the load cell 6, and then inputs this measured value W and the large quantity supply completion type "IWI+" input from the setting section 10. Small amount supply completed weight W2. Compare with target weight W0 (Step 1. Step 2
).

As a result of the comparison, if the measured value W is W < W, the process moves to the mass supply process shown in Figure 4 ■, and if the measured value W is W, ≦
When it falls within the range of W < W, it shifts to the micro-supply process (not shown in ■), and furthermore, when the measured value W falls within the range of W2≦W < Wo, it moves to the static 1] bistable state (not shown in ■). processing.

The process moves to the additional small amount supply process shown in (1) to (2), and if the measured value W or W, .

In addition, in this operation flow, no matter which processing route from ■ to ■ is followed, the process always returns to the first step J5 and step 2, so for example 2.

When the measured value is fluctuating up and down due to the vibration of the measuring water soba 5, the large quantity supply process ■ and the small quantity supply process ■ may be repeated alternately, or the mass supply process ■ may be suddenly followed by the discharge process of the object to be weighed. It may shift to ■.

When proceeding to the mass supply process (2), first check whether the feeder 3 has stopped (step 1), and if it has stopped, then output a command to operate the feeder 3 in the second step 2. If the feeder 3 is operating, step 2 is skipped and the primary gate 1-4-1 is checked to see if it is at the second stage position (step 3).
As a result of the check, if it is in the lower position, a command to raise the cage 4-1 is output, and a command to increase the amplitude of the feeder 3 is output (Step 4). If the gate 4-1 is in the upper position, step 4 is skipped and it is checked whether the primary check flag is ON (step 5). This check flag is turned ON in step 3-4 of the stationary stabilization process (2) to be described later. therefore.

If the check flag is ON during bulk supply processing ■, the weighing value W is checked again in step 2 after it is stable.
This is a case where it is determined that W is insufficient (W<W,).

If the check flag is ON, it is turned OFF in the second step 6 and the process returns to the first step 1.

If the check flag is OFF, step 6 is skipped and the process returns to the first step 1.

As the mass supply process ■ is repeated in this way, the measured value W becomes W.
, ≦W < W2, this time, the process shifts to the small amount supply process, which is not shown in (■).

In the trace amount supply process (■), step 2-1. Step 2-2
In step 1 mentioned above. The same process as that in step 2 is executed, and in the subsequent step 2-3 it is checked whether the gate 4-1 is in the upper position. If it is in the upper position, a command to lower it is output in the following step 2-4.

Subsequently, a command to attenuate the amplitude of the feeder 3 is output.

If it is in the lower position, step 2-4 is skipped, and in the following steps 2-5 and 2-6 = 9-, the same processing as that performed in step I-5 and step 6 described above is performed. Execute.

In this way, the small quantity supply completed weight W2 is reached, and the measured value W becomes W
If it falls within the range of 2≦W<W, the process moves to the seventh stationary stabilization process (■).

In the stationary stabilization process (3), first check whether the feeder 3 is stopped (step 3-1).

If it is not stopped, a command to stop it is output in the second step 3-2, and if it is stopped, it is output in step 3 above.
-2 is skipped and the process moves to the secondary step 3-3.

In the next step 3-3, it is checked whether the check flag is ON. Check results.

If it is OFF, a timer for measuring stabilization time is set in the first step 3-4, and then the check flag is turned ON. Then, while repeating the timeout check process in the first step 3-5, wait for the stabilization time described above to elapse, and if the timeout occurs, the first step 1.
Returning to step 2, the measured value W after stabilization is rechecked.

=10- As a result of the check, the measured value W is W. If ≦W,
If the process moves to process (3) for discharging the object to be weighed, and the it quantity value W is again within the range of W2≦W<W.

After the process of step 3-3, the process moves to additional micro M (l supply process 2).

In the additional small amount supply process■, first turn off the check flag set in step 3-4, then perform ;i5 calculation on W, -W w, -w+□, and use the result W as the next The feeder 2 is then sent as a new small amount supply completed weight, and an operation command is output to the stopped feeder 2 (step 4-1). Then, in the next step 4-2, wait for the weight value W to reach the new minute supply completion weight tag, and when it reaches the minute supply completion weight W3, in the first step 4-3, a command is given to stop the feeder 3. Output. and.

Go back to step 3-4 and set the timer 2.
In the next step 3-5, wait until the measuring water soba 5 becomes static and stable.

In this way, the process returns to the first step 1 and as a result of the check in the second step 2, if the weighed value W is W6≦W, the process moves to the discharge process of the object to be weighed (■), and if the weighed value W is W2≦W<
If it falls within the range of W, the process shifts to the additional small amount supply process (2) again.

In the above calculation formula, half of the deficit 1f(W, , -W> is added to the measured value W when it is stationary and stable, but it is not necessarily limited to this.1For example, the property of the object to be weighed, Depending on liquidity etc., 1/3.2/ of the shortage M(w, -W)
3.215.315.3/74/7 etc. may be added to the measured value W when the weight is stable.

In this way, when the measured value when the machine is stationary and stable after supplying is completed is insufficient, add a value slightly smaller than the insufficient amount to the measured value and use the value added by 1 as the new supply completed weight to supply an additional small amount. So, according to the shortage amount. Moreover, it is possible to perform an additional small amount supply taking into consideration the head error. Therefore, in this invention, the measurement error due to the head error can be reduced compared to the conventional one.

Next, in the process (2) of discharging the object to be weighed, first check whether the feeder 3 is stopped (step 5-)), and if it is not stopped, a command to stop it is output in the fifth step 5-2. If it is stopped, step 5-
2 is skipped, and in the ninth step 5-3, it is checked whether the check flag is turned on. and,
If it is ON, then in step 5-4 a command is output to open the measuring water soba 5, and then the check flag is turned OFF to complete one measuring cycle. Also, as a result of the check in step 5-3, the flag is set to OFF.
If F, the process returns to step 3-4, sets the timer, and waits until the measuring water soba 5 becomes stationary and stable. Then, one measurement cycle is completed through the same processes as described above.

Although omitted in this operation flow, when a signal is inputted to Star 1 from the outside again, the updated last small amount supply completed weight W3 is cleared.

In addition, in the above description, a device for carrying out the present invention uses a 13-line supply trough 2 for objects to be weighed, but the present invention is not limited to this.
For example, a feeder having a large quantity supply trough and a small quantity supply trough may be used, or one which performs large quantity supply and minute quantity supply only by controlling the amplitude of the feeder may be used.

(Effects of the Invention) As described above, the present invention sets the completed weight of a small amount of supply to be slightly less than the target weight, and when the measured value when the supply is stable after completion of supply is insufficient.

Add a value slightly less than the missing amount to the measured value.

The added value was used as the new weight of completed supply, and an additional small amount was supplied, so that the shortage was met. Moreover, it is possible to perform an additional small amount supply taking into consideration the head error. Therefore, it is possible to reduce the measurement error due to the head error compared to the conventional one, and to improve the overall measurement accuracy.

14-

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a device used to carry out the measuring method according to the present invention, Figs. 2 and 3 are explanatory diagrams of the operation of the embodiment device, and Fig. 4 is an operational flow diagram of the embodiment device. This is the flowchart 1 shown. Applicant Ishida Koki Seisakusho Co., Ltd. Representative Patent Attorney Tsune Takeuchi 15- Figure 1

Claims (1)

[Scope of Claims] +1) The supply flow rate of the object to be weighed to the hopper is controlled based on the weight of the object to be weighed in the weighing hopper. When the weight of the object to be weighed reaches the target weight, in the weighing method of discharging the object in the hopper, if the measured value when the object is stationary and stable after the supply is completed is insufficient for the target weight, the measured value is A weighing method characterized by adding a weight value slightly less than the insufficient weight and supplying an additional small amount based on the added value. (2. In the measuring method described in claim 1, 1
A measuring method characterized by adding a weight value slightly less than the insufficient weight to the current measured value, and setting the added total value as the completed weight of the additional small amount of supply.