JPH0481625A - Sorting apparatus of weight - Google Patents

Abstract

PURPOSE:To avoid a state wherein a group of articles to be sorted is let to flow to a processing line in a subsequent stage, by detecting the occurrence of the state of a specified condition and by determining automatically whether a weighed value GN is inside the range of an allowable error or outside it. CONSTITUTION:Weight ranks Z1 to Z7 of discharge stations 41 to 47 and the weight of an article to be sorted which is loaded in a passing bucket 2 are compared with each other and the article to be sorted is discharged from the bucket at the pertinent one of discharge stations 41 to 47. Vessels 131 to 137 for storing the article to be sorted are provided for the discharge stations 41 to 47 respectively, while a weigher 7 measuring the net weight of each of the aforesaid vessels 131 to 137 is provided. When a net weight value outputted by a weigher when the number of pieces of the article to be sorted and being discharged to the specified one of discharge stations 41 to 47 reaches the preset number N of pieces is denoted by GN, the upper limit value of the weight rank of which the specified discharge station takes charge by ZH, the lower limit value thereof by ZL and the rate of an allowable error by (n), the occurrence of any one of states shown by the formulas is detected. Then, information is made on a faulty 15 result of sorting.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a weight sorting device for sorting according to weight values.

As shown in FIG. 4, a conventional technique disclosed in Japanese Unexamined Patent Application Publication No. 59-76583 is provided with an endless body 1 that is rotatably driven in the vertical direction [direction of arrow B] with respect to an installation location A. A plurality of buckets 2 are attached to the weighing station 3 arranged outside the system of the endless body 1, and the weighed products to be sorted are sequentially put into the buckets 2, and then placed on the buckets 2 and sent to the discharge station 7. 4. - When passing through 4N, the weight value of each item to be sorted is compared with the weight rank of its discharge station, and bucket 2 is placed at the discharge station of the corresponding weight rank.
When the product arrives, the bucket 2 is tilted to discharge the products to be sorted at the corresponding discharge station position, for example, at the discharge station 4° in FIG. 4, for each weight rank. .

Problems to be Solved by the Invention In such a conventional configuration, although the products to be sorted are sorted by weight rank, there is no means to confirm whether or not the sorting has been achieved in the set weight rank without any sorting mistakes. Not provided.

An object of the present invention is to provide a weight sorting device that can confirm whether the sorting results are correct.

Means for Solving the Problems The weight sorting device of the present invention includes discharging stations arranged in the order of weight rank along the conveyance route of the bucket, and articles to be sorted are placed on the buckets and conveyed, and the weight rank of the discharging station is determined according to the weight rank. The container is configured to compare the weight of the products to be sorted placed in the passing bucket and discharge the products to be sorted from the bucket at the corresponding discharge station, and to store the products to be sorted at each discharge station. A weighing machine is provided to measure the net weight of each container, and the net weight value outputted by the weighing machine when the number of items to be sorted delivered to a specific discharge station or the preset number "N" is reached. "G N 'i" is the upper limit of the weight rank in charge of that particular discharge station "ZHII,"
The present invention is characterized in that a control section is provided which detects the occurrence of any of the following conditions and notifies a defective screening result, where the lower limit value is "ZLN tolerance ratio is n".

According to this configuration, the items to be sorted discharged to a specific discharge station are received in a container, and the net weight of the items to be sorted put into this container is measured by a weighing machine. The control unit determines whether the sorting result is within the allowable error weight based on the weight value of the weighing machine when the number of items to be sorted delivered to a specific discharge station or the preset number of items has been reached. Determine.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. Components having the same functions as those in FIG. 4 showing the conventional example will be described with the same reference numerals.

FIGS. 2 and 3 show the weight sorting device of the present invention, in which the endless body 1 is arranged to rotate horizontally with respect to the installation location A, and the forward path 5 and return path 6 are in the same plane. Endless body 1
A plurality of buckets 2 on which items to be sorted are placed are attached at predetermined intervals.

Here, discharge stations 41 to 44 are arranged along the conveyance direction C on the outward path 5 of the endless body 1, and discharge stations 45 to 47 are arranged on the return path 6. Outbound trip 5 discharge station 4. A weighing machine 7 is installed on the upper side of ~44. The weighing machine 7 measures the load of the passing bucket.

Each bucket 2 has a first . A radio response tag T containing a second memory is attached. A read/write device 8 is attached near the weighing machine 7 for reading and writing to the radio response tag T attached to the bucket 2 being weighed.

The weight value of the weighing machine 7 is input to the reading/writing device 8 .

Immediately after the start of operation, the operation is performed without any products to be sorted placed in any of the buckets 2, and the weight value (tare weight value Gt) of each bucket 2 on the weighing machine 7 at that time is read and written. It is written via the device 8 into the first memory of the radio responsive tag T attached to its own bucket 2. During subsequent operation, the tare weight value Gt read from the first memory of the wireless response tag T attached to the own bucket 2 is used to determine the total weight value G obtained from the weighing machine 7 at that time.
is corrected to determine the net weight value G of the items to be sorted. Calculate the net weight value G. is written to the second memory of the radio responsive tag T attached to its own bucket 2 via the read/write device 8.

Each of the discharge stations 4 to 47 is provided with a radio response tag T reading device 9. Each successive device 9 calculates the net weight value G of the items to be sorted placed thereon from the second memory of the wireless response tag T attached to the arriving bucket 2. 4. for each discharge station.
-47 comparators 01-C7.

Comparators C1 to C7 are given weight ranks Z and -Z7 as reference values, respectively. Here, the weights are given in the order of weight from smallest to largest: Z1, Z2, Z3, Z4, Z5, Z6, Z7.

Discharge station 4. Ejection trigger Q provided at ~47
□ to Q7 are operated based on the outputs of the respective comparators 01 to C7.

Specifically, the comparator C1 receives the net weight value G read out by the reading device 9. and the weight rank Z set from the control unit IO, and if Go≦Z1.1, the discharge trigger Q1 is driven, and the bucket 2 located at the discharge station 41 is tilted and The items to be sorted placed on the container are discharged to +3°. The driving of the discharge trigger Q1 is immediately released after the bucket 2 is tilted to prepare for the subsequent bucket 2. Ejection trigger Q2
The same applies to the driving of Q7. In addition, here ZI
H is the upper limit of weight rank Z1.

Similarly, the comparator C2 receives the net weight value G read out by the reading device 9. and the weight rank Z2 set from the control unit IO.
When Z2L<Go≦22H, the discharge trigger Q2 is activated, the bucket 2 located at the discharge station 4° is tilted, and the items to be sorted are discharged into the container 13°. Z2L is the lower limit value of weight rank Z2 (=Z,□) NZ2+1 is the upper limit value of weight rank Z2.

The same applies to comparators 03 to C7 of weight ranks 73 to Z7.

In FIGS. 2 and 3, the discharge trigger Q2. Q7 is driven, and the buckets 2 that have arrived at the discharge stations 42 and 47 are tilted.

Here, the case of checking the sorting results of the discharge station 44 will be explained as an example. In this case, the container I34 is supported by the weighing machine I4 as shown in FIGS. 1 and 3, and during operation, the load on the container 134 itself is erased as a tare amount. During operation, the weight value G of weighing machine I4
N, the number of times the discharge trigger Q4 is driven, etc. are processed by the control unit 15 as follows.

The control unit 15 controls a discharge trigger Q4 that is driven when discharging the sorted items from the discharge station 44 into the container 134.
The number of times of driving is counted by the number management unit I6, and when the counted value reaches the preset value N, the routine of the determination unit 17 is executed. The determination unit 17 determines the weight value GN of the weighing machine 14 based on the weight rank Z4 assigned to the discharge station 44, which is a specific discharge station, and the allowable error ratio n (however, n is 1 or less). is determined as follows. The weight value GN referred to here is the weight value after the Nth item to be sorted falls into the container 134.

The upper limit of weight rank Z4 is "'Z4H", and the lower limit is "Z".
In the case of 4LU, the occurrence of any of the conditions (hereinafter referred to as blank space) is detected, and in this case, the weighed value GN is outside the allowable error range, and the buzzer 18 is sounded to notify that the sorting result is defective. .

Note that the preset value N satisfies N≦NH, where NH is the number of re-accommodations determined by the capacity of the container 134 and the size of the items to be sorted.

If the buzzer 18 sounds and the sorting result is found to be defective, the traveling speed of the endless body 1 is reduced and the weight of the articles to be sorted in the container 134 is re-sorted. It turns out.

In the above embodiment, the control unit 15 judged the quality of the sorting results for the discharge station 44, but the other discharge stations 43, 4°, 43 r 45 +
Regarding 4e147, the quality of the screening results can be determined in the same way.

Effects of the Invention As described above, according to the present invention, each discharge station is provided with a container for storing the products to be sorted, and a weighing machine is provided to measure the net weight of each container, so that the products discharged to a specific discharge stage tank are provided with a weighing machine for measuring the net weight of each container. The net weight value output by the weighing machine when the number of items to be sorted reaches the preset number “N” is “GN”.
N is the upper limit of the weight rank in charge of that particular discharge station as "Z)l" 1 The lower limit is "ZL"
GsZ'``'' *N (1-n) > G, because a control unit is provided that detects the occurrence of any of the following conditions and notifies the failure of the sorting results, so that the weighed value GN is within the allowable error range. It is possible to automatically determine whether the product is a child or not, and it is possible to avoid a situation in which a group of products to be sorted that is likely to have a large weighing error in sorting is sent to a subsequent processing line.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit configuration diagram of a main part of an embodiment of the weight sorting device of the present invention, Figs. 2 and 3 are a plan view and a front view of the same weight sorting device, and Fig. 4 is a conventional weight sorting device. FIG. 3 is a front view of the device. 1... Endless body, 2... Bucket, 41-47...
・Discharge station, 7... Weighing machine, 13, ~ 137
... Container, 14... Weighing machine, 15... Control unit, 1
B... Number management unit, 17... Judgment unit, I8... Buzzer, C1 to C7... Comparator, Q. ~Q7...Ejection trigger, ZI-77...Weight rank.

Claims (1)

[Claims] 1. Discharge stations are provided in the order of weight rank along the conveyance route of the bucket, and the articles to be sorted are placed on the buckets and conveyed, and placed on the weight ranks of the discharge stations and the passing buckets. The weight of the items to be sorted is compared and the items to be sorted are discharged from the bucket at the corresponding discharge station, and a container for storing the items to be sorted is provided at each discharge station, and each of the containers is A weighing machine is installed to measure the net weight, and the number of items to be sorted delivered to a specific discharge station is a preset number.
The net weight value output by the weighing machine when reaching “N” is “G”.
_N”, the upper limit of the weight rank in charge of that particular discharge station is “Z_H”, the lower limit is “Z_L”, and the tolerance ratio is n, then (Z_H+Z_L)/2・N(1+n)< G_N(Z_
A weight sorting device that includes a control unit that detects the occurrence of any of the conditions H+Z_L)/2·N(1-n)>G_N and notifies a defective sorting result.