JPS61137021A - Cumulative weighing method - Google Patents

Abstract

PURPOSE:To prevent excessive weighing, by once necessarily stopping weighing before reaching a real objective value and allowing the difference between said temporary objective value and the real objective value to approach the real objective value by inching operation. CONSTITUTION:A stock material 2 is put in a tank 1 and a feeder 3 is mounted to the lower part of said tank 1. When a wiring breaker 5 is turned ON and a solenoid switch 6 is turned ON< the feeder 3 delivers the stock material 2. The delivered stock material 2 enters a weighing machine 4 to oscillate a weighing wt. value. A controller 9 for controlling these operations is constituted of an output part 7 for performing the ON/OFF operation of the solenoid switch 6, an input part 8 for inputting of the weighing value signal of a weighing machine and a setting apparatus 10 for setting various set values. The setting apparatus 10 sets a real objective value, a temporary objective value, a tolerant value, a wt. before determination, weighing machine stable times I, II and an inching time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of the Invention The present invention is suitable for weighing a wide variety of items while weighing them on one scale. The same idea can be used in various fields such as powder, granule, and liquid.

[Background of the invention]

In the conventional method, since there is no provisional target value setting, the kit amount is measured only with the true target value as the target. For that reason K.

When the measured amount exceeds the allowable value e, it takes a lot of man-hours to return the weighed raw material to its original state, and also causes various problems. There are some raw materials that can be tolerated in short supply, but cannot be tolerated in excess, so it was necessary to stop before the target value was reached.

[Object of the invention]

An object of the present invention is to prevent overdosing by always stopping the metering just before the true target value.

[Summary of the invention]

Excessive amount of ink during measurement is often unavoidable due to various reasons. Therefore, if control is performed by considering the true target value of the conventional concept as the provisional target value of the present invention, it becomes clear that an excess amount will not necessarily occur due to the difference in weight between the true target value and the provisional target value. Therefore, that weight is applied to the tentative target value, and the difference between the tentative target value and the true target value is calculated by inch blowing (inching) operation.
I thought that if I got close to the true target value, it would never be the right amount.

However, in this case, it is necessary to set the inching time so that the cutout by inching - times is less than the allowable value.

When measuring in this manner, if the measured value is not within the allowable value after measuring with the provisional target value as the target, the inching operation on the negative side will always bring it closer to the true target value. Moreover, since the measured weight does not exceed the allowable weight due to -times of inching, optimal weighing is possible.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows the overall configuration of the machine. In tank 1, i charge 2
feeder 3 is installed at the bottom. When the circuit breaker 5 is turned on and the electromagnetic switch 6 is turned on, feeder sFi raw material 2 gold is cut out. The cut raw material 2 enters a weighing machine 4 and oscillates a measured weight value. The controller 9 that controls these operations has a 1L magnetic switch 6 turned on.
.

It consists of an output section 7 that turns off, an input section 8 that inputs the weighing value signal of the weighing machine, and a setting device @io that sets the constant value of each electrode membrane. The following items are set from the setting device.

True target value, provisional target value, allowable value, weight before determination, weighing machine stability time 1% al inch puffer time.

Next, the operation will be explained.

When the control is started, first, the output section 7 of the controller 9 for the feeder 1 is turned on. When the feeder 3 rotates, the raw material 2 passes through the feeder 3 and is transferred to the weighing machine 4.
to go into. The weighing machine 4 oscillates the weight of the raw material contained therein and inputs it to the human power section 8 of the controller 9. Inside the controller 9, the output continues to be ONL until the value obtained by subtracting the pre-quantification weight from the temporary target value is reached. If the value of the measured value signal input to the controller 9 matches the value obtained by subtracting the pre-quantification weight from the temporary target value, the output cuff is turned off and the number of L feeders is stopped. At this time, even if the feeder is stopped, the motor does not suddenly stop, but rotates with a little inertia, and the raw material comes out, adding to the weighed value. In addition, raw materials that fall halfway from the feeder mouth to the point where they fall into the weighing machine are also added to the weighed value. Therefore, as shown in FIG. 2, after the stabilization time l has elapsed, the measured value signal becomes stable and stops around the temporary target value.

If there is no person within the range of the measured value at this time or the true target value Φ or e tolerance, the metering is started again by inching operation. The inching operation is turned ON only for the set inching time and then turned OFF immediately. However, if the raw material becomes wet in - times of inching time, it is necessary to set the time so that it does not exceed the allowable value range. This is determined and set in advance through experiments. Even after turning off the inching operation, check whether the weighing value after the stabilization time (3) of the weighing machine has elapsed and whether it is within the range of the true target value e or the allowable value e. If the value is within the allowable range, shift to feeder ■ operation,
If no one is in the area, perform inching operation again.

Feeder I operates in the same way as feeder 19.
Perform return control.

By repeating the above actions, #4 horizontal itt! Take control. Even if there are many feeders, the same control can be performed freely within the weighing range of the weighing machine.

〔Effect of the invention〕

1. The weighing value no longer exceeds 1t (exceeds the CD tolerance). Therefore, there is no waste of raw materials.

If the λ tolerance value is set small and the inching time is also shortened, the true target value will be approached and the variation will be reduced. Therefore, it becomes a stable product.

1. If the tentative target value is brought closer to the true target value, the number of intensifications will be reduced.Moreover, if the tentative target value and the true blindness value are made the same, it will be possible to achieve high-speed operation without performing inch blowing, although there will be variations in accuracy. You will also be able to perform measurements.

[Brief explanation of drawings]

Figure 1 is an overall configuration diagram of an apparatus for carrying out the method of the present invention;
The figure is a timing chart during operation.

Claims (1)

[Claims] In a system consisting of a weighing machine, multiple feeders that feed fluid raw materials into the weighing machine, and a controller that inputs the weight signal of the weighing machine and controls the operation stoppage of the feeders, the controller contains a calculated or set truth value. By setting a target weight value and a temporary target value on the near side of the target weight value, when weighing, first measure with the temporary target value as the target, and then move closer to the true target value by inching operation to achieve high accuracy. What's more, the cumulative weighing method prevents overdosing.