JPS602113B2 - High-speed precision sorting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for sorting articles such as canned goods, bottled goods, and other containerized products at high speed and with high precision.

As shown in FIG. 1, in the conventional sorting device, articles to be weighed 2 fed by a feed conveyor 1 are weighed by a high-speed weighing device 3, and the articles are weighed by a sorting device 4 based on the weighing results. If the weighing article 2 is an acceptable item, the acceptable item conveyor 5
Furthermore, when the article 2 to be weighed is a rejected article, it is distributed to the rejected article conveyor 6.

Since such a sorting device uses a high-speed weighing device 3, it is possible to sort 300 to 75 solid articles 2 to be weighed per minute, but the sorting accuracy is as low as 1 to 2 minutes. Therefore, for example, as shown in Fig. 2, if the lower limit weight of the article to be weighed 2 is 245 mm and the weighing accuracy of the high-speed weighing device 3 is 1 mm, then first of all, items below the lower limit weight will not be accepted. The standard weight for sorting must be 246, and items in the range of 246±1 weight may be judged as either acceptable or rejected, so in order to avoid judging acceptable items as rejected, If the weight of the article to be weighed 2 varies by 3 days on Saturday, the average value of the article to be weighed 2 must be set to 250 days, which is 5 days larger than the lower limit weight, which poses a problem in terms of product price. . For example, if a measuring device with a high measuring accuracy of ±0.1 mm is used, the above-mentioned problem in product price can be solved, but there is a problem in that the processing capacity is reduced to about 120 pieces per minute. An object of the present invention is to provide a sorting device that can sort at high speed and with high precision.

The present invention will be explained below based on one embodiment shown in FIGS. 3 and 4.

This example also sets the lower limit weight to 245 mm. In FIG. 3, 10 is an infeed conveyor, 12 is a pitch regulating device, and the pitch regulating device 1 controls the pitch (time, interval) of the articles 14 to be weighed that have been conveyed on the infeed conveyor 10.
The liquid is fed into the measuring device 16 while being regulated by 2. Although this weighing device 16 is capable of high-speed weighing, its weighing accuracy is as low as ±1 minute, and the selection standard weight is set at 246.2 mm.
The weighed articles 14 that have been weighed are transferred onto the delivery conveyor 8, and those whose weight is less than the sorting reference weight are transferred onto the pool conveyor 22 via the two sorting devices.

The weighing device 1 is attached to the weighing object 14 on the pool conveyor 22.
Due to the poor accuracy of No. 6, some products within the range of 246.2 pm ± 1 pm (which should originally be judged as acceptable products) are included. The articles 14 to be weighed on this pool conveyor 22 are weighed by a weighing device 24 .

Although this weighing device 24 is a low-speed weighing device, it has a high measuring accuracy of 0.1 min per day, and the selection standard weight is set to 245.1 min. Article to be weighed 1 weighed by the weighing device 24
4 are transferred onto a conveyor 28 equipped with sorting gates 26, 26, and as a result of highly accurate weighing, those of 245.1 ta or more are transferred onto the feeding conveyor 8 by the sorting gates 26, 26. Reference numeral 29 denotes a stopper, which temporarily stops the article to be weighed 14 originally transferred on the infeed conveyor 18 when transferring the article to be weighed 14 from the conveyor 28 onto the infeed conveyor 18 to prevent collision. It is for the purpose of

In the sorting device configured in this way, the high-speed but low-precision weighing device 16 performs a rough sorting, and the products that are rejected by this sorting are re-sorted using the low-speed and high-precision weighing device 24. After this re-selection, the products determined to be acceptable are returned onto the delivery conveyor 18. At this time, the measuring accuracy of the measuring device 16 is 4th.
If it is specified as 30 as shown in the figure, even if it is within the range of acceptable products, 247.2% is 0.3%, 24%
50% of the products were determined to be rejected on 6.2 and 99.7% on 245.2, but these amounts are based on all the products sent by one river on the infeed conveyor, as shown by numeral 30. Since the quantity is small compared to the number of articles 14 to be weighed (indicated by reference numeral 32 in FIG. 4), it can be sufficiently processed by the slow but highly accurate weighing device 24. Therefore, by using the high-speed but low-precision weighing device 16 and the low-speed but high-precision weighing device 24 together, it is possible to perform high-speed and high-precision sorting. Moreover, in order to ensure that an article 14 to be weighed with a weight of 245 ta or more is determined to be an acceptable item, if the range of variation in the weight of the article 14 to be weighed is 3 Saturdays, the average weight must be 2 as shown in Figure 4.
Only 48.2 hours of friction is required, making it 1.8 hours smaller than the structure shown in FIG. 1, and solving the problem of product price.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional high-speed sorting device, FIG. 2 is a diagram showing the relationship between the average weight and lower limit weight of articles sorted by the high-speed sorting device of FIG. 1, and FIG. FIG. 4, which is a plan view of the precision sorting device, is a diagram showing the relationship between the average weight and the lower limit weight of articles sorted by the precision sorting device. 10, 18... Main transfer path, 16...
First sorting device, 20...First sorting device, 2
2, 28... Sub-transfer route, 24... Second sorting device, 26... Second sorting device. O′ fig. 2 fig. 3 fig. O 4 fig.

Claims (1)

[Claims] 1. A first weighing device that is installed in the middle of the main transport path of articles and can measure a large number of items per unit time but has low measurement accuracy; and a first reference weight that is predetermined by the measured value of the first weighing device. In the following cases, there is a first sorting device that distributes the articles from the main transfer path to the sub-transfer path, and a first sorting device that is installed midway through the sub-transfer path and weighs a small number of items per unit time.
a second weighing device with higher measurement accuracy than the second weighing device;
The measured value of the measuring device is predetermined in the vicinity of the value obtained by subtracting the measuring error of the first measuring device from the first reference weight.
a second sorting device that returns the articles on the sub-transfer path to the main transfer path when the weight exceeds the reference weight of the article.