JPS6031022A - Method of discharging material to be measured in combination scale - Google Patents

Abstract

PURPOSE:To improve combination accuracy, by forcibly discharging a material to be measured in hoppers based on the conditions corresponding to the state where measuring hoppers are not combined and selected, and forcibly discharging the measuring hoppers, which are hard to be combined and selected. CONSTITUTION:When hoppers 1''... are combined and selected, corresponding counters 10, which are counted up every time combination and selection are not performed, are cleared. The hoppers 1'', which are not selected, are detected by a control device 7 for every combination or for every number of times of combinations. When the maximum and minimum measured values in a memory part 7b are not selected, the hoppers 1'' corresponding to both or either of the values are forcibly discharged through a judging part 7a which responds to the discharge condition. When either of the values is selected, the hoppers corresponding to the other value are forcibly discharged. When both values are selected, the materials to be measured in the hoppers, whose continuous number of unselected times is many, are sequentially discharged forcibly in that order. The measuring hoppers, which are hard to be combined and selected, are forcibly discharged. Thus the probability of selection of each hopper becomes high and the combination accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combination weigher, in particular, a combination weighing device that weighs each of the objects supplied to a plurality of weighing hoppers, and selects a combination of a plurality of weighing hoppers that achieves a set weight within a tolerance. Concerning improvement of scales.

The standard amount W of objects to be weighed into each weighing hopper in the above combination weigher is as follows: Wt: set weight: standard number of combined weighing hoppers, W=Wt- If the transport conditions for the objects to be weighed are appropriate, the amount of objects to be weighed carried into each weighing hopper will be a normal distribution centered on the reference amount W.

Most of the objects to be weighed in the weighing hopper that are selected as a combination have weight values close to the standard incoming amount W, and weight values that are significantly different, such as the maximum weight value or the minimum weight value, have a high probability of being selected as a combination. low.

That is, the Nl lids to be weighed are stored in the weighing hopper for a long time, causing the following problems.

0. Movement of the point due to long-term load.

0 Adhesion of the object to be weighed to the needle hopper 0 Decreased combination accuracy because it does not actually participate in the combination.

Furthermore, even if a combination that is closest to the set weight is intentionally selected among combinations that include the maximum or minimum weight value, the combination accuracy will be poor.

The present invention has been made in view of the above-mentioned conventional circumstances, and its purpose is to forcibly discharge objects to be weighed in a weighing hopper that are difficult to select for combinations such as maximum weighing value or minimum weighing value. In this way, the purpose is to further improve the combination precision of the combination scale.

The method for discharging objects to be weighed in a combination scale of the present invention is such that in the combination scale, each weighing hopper is provided with a counter for counting the number of consecutive times that a combination is not selected, and a counter is provided for counting the number of consecutive times that a combination is not selected. ,the below described(
It is characterized in that the object to be weighed in the weighing hopper is forcibly discharged according to the discharge conditions of a) to (C).

(a) If neither of the objects to be weighed with the maximum weight value and the minimum weight value is selected as a combination, the shrimp size t'l - the weight value and/or the weight object with the minimum weight value.

(b) The other object to be weighed when either the maximum weighing value or the minimum weighing value is selected as a combination.

(e) When both the maximum weight value and the minimum weight value are selected as a combination, one or more objects to be weighed in descending order of the number of consecutive times that they are not selected as a combination.

An example of the implementation of the present invention will be explained using the combination scale shown in FIG. A combination is obtained by discharging the objects to be weighed in the weighing hopper (1) selected as follows.

Each of the above weighing hoppers (a pool hopper (4
) are provided respectively. The pool hopper (4) receives the object to be weighed on the distribution plate (not shown) via the supply trough (not shown), temporarily stores it, and returns the object to be weighed when the weighing hopper (1) is empty. It is intended to supply

A collecting hopper (5) is provided below the weighing hopper (5) to collect the objects to be weighed, and the collecting hopper (5)
The discharge port 5) is branched into two, and a valve (6) is provided at the branched portion.

A combined wave meter i is installed on one side of the outlet of the collective popper (5).
'An inlet (8) for a packaging machine or the like to carry in objects is provided, and a collection port (9) for collecting objects to be weighed that are not used in combination is provided on the other side.

The valve (6) is configured to open one exhaust outlet and open the other outlet, so that the objects to be weighed that have been lowered into the collecting hopper (5) can be transferred to the carrying-in opening (8) or the collection opening (9). It will guide you to either one.

Next, the control device (7) of the above-mentioned combination weigher will be explained with reference to FIG. It also controls the feeder (2) and the feeder (3) of the supply trough, and includes a determination section (7a) and a storage section (7b).

The dispersion feeder (2) drives a dispersion plate that disperses the objects to be measured, and the feeder (3) drives the dispersion plate that disperses the objects to be measured.
- for conveying weighed items to the pool hopper (4);
It is driven when the inside of the pool hopper (4) is empty.

The pool hopper (4) opens when the weighing hopper (1) is empty and supplies the object to be weighed to the weighing hopper (1), and the needle hoppers (1) each have a hopper opening/closing section (1
).

The storage unit (7b) stores the following (1k) to (e) as discharge conditions.

(a) If neither the maximum weight nor the minimum weight is selected as a combination, the object with the maximum weight and/or the minimum weight.

(b) The other object to be weighed when either the maximum weighing value or the minimum weighing value is selected as a combination.

(e) When both the maximum weight value and the minimum weight value are selected as a combination, one or more objects to be weighed in descending order of the number of consecutive times that they are not selected as a combination.

(d) If no combination is selected, one or more objects to be weighed in descending order of the number of consecutive times that they are not selected as a combination.

6- (e) If a combination is not selected and there are multiple objects to be weighed that have the highest number of consecutive times that they are not selected as a combination, then Weighing object.

The determination unit (7a) determines whether any of the objects to be weighed in each weighing hopper (1) is stored in the storage unit (7b) and satisfies the weighing condition 7', and performs the corresponding weighing process. Hopper (1
) is opened and the valve (6) is opened to the collection port (9) side.

The control device (7) selects a combination of set weight tolerances by combining the objects to be weighed in each weighing hopper, opens the opening/closing part (1) of the selected weighing hopper (1), and opens the valve (1).
6) is opened to the machine entrance (8) side.

Each weighing hopper (1) is provided with a counter (7).

Counter α (This is a counter that counts the number of times the weighing hopper (1) does not participate in the combination, and is cleared when the weighing hopper / < - (1) participates in the combination, and the counted value is constantly input to the determination section (7a).

As described above, the present invention provides a combination weigher that weighs objects to be weighed supplied to a plurality of weighing hoppers and selects a combination of a plurality of weighing hoppers that achieves a set weight within a tolerance. A counter is provided to count the number of consecutive times that a combination is not selected, and each time a combination is made or a predetermined number of times, the following discharge conditions (a) to (c) are met: (a) Maximum weighed value and minimum 1tt-tii: The maximum weighing value and/or the minimum weighing value of the weighing object, if the weighing object with the value does not fall or swamp as a combination.

(b) The other object to be weighed when either the maximum weighing value or the minimum weighing value is selected as a combination.

(C) When both the maximum IT amount value and the minimum weighing value are selected as a combination, one or more objects to be weighed in descending order of the number of consecutive times that they are not selected as a combination.

Accordingly, the weighing object discharging method is configured to forcibly discharge the weighing object in the sugar amount hopper, so the wave meter with the maximum weighing value and minimum weighing value, which is difficult to select as a combination, is forcibly discharging the object, and The object to be weighed does not need to be stored inside for a long time.

Therefore, there is almost no movement of the zero point of the hopper, and there is minimal adhesion of objects to be weighed.

Historically, most of the objects to be weighed in the weighing hopper are selected as a combination at a high rate, so the combination accuracy is good.

Thus, the desired goal is achieved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a combination weigher according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the control configuration thereof. In the diagram, (1)...Weighing hopper (S...Opening/closing part (7)
...Control device (7a)...Determination unit (7b)...Storage unit 1...Counter. 9-

Claims (1)

[Claims] In a combination weigher that weighs objects to be weighed supplied to a plurality of weighing hoppers and selects a combination of the plurality of weighing hoppers that achieves a set weight within a tolerance, A counter is provided to count the number of consecutive times that the item is not selected, and the object to be weighed in the weighing hopper is forcibly discharged in accordance with the discharge conditions (a) to (e) below for each combination or for each predetermined number of combinations. Method for discharging objects to be weighed. (a) If neither the maximum weight value nor the minimum weight value is selected as a combination, the maximum weight value and/or the minimum weight value. (b) The other object to be weighed when either the maximum weighing value or the minimum weighing value is selected as a combination. (c) When both the maximum weighing value and the minimum weighing value are selected as a combination, one or more objects to be weighed in descending order of the number of consecutive same items that are not selected as a combination.