JPH04180874A - Weight sorting apparatus - Google Patents

Abstract

PURPOSE:To perform wt. sorting over a long period of time with high accuracy by providing a control part subtracting the measured wt. value of the second weighing part from the measured wt. value of the second weighing part at every bucket to calculate the net wt. of a placed object to be sorted. CONSTITUTION:When wt. sorting is executed while an endless body 1 is operated at a fast speed, the tare wt. of each bucket 2 is weighed each time in the second weighing part 3b arranged on the upstream side of an intermediate point B positioned on the upstream side of the first weighing part 3a. The total wt. of each bucket 2 and the object 4 to be sorted placed thereon is weighed in the first weighing part 3b on the downstream side of the intermediate point B. As mentioned above, the tare wt. of the bucket is weighed in the second weighing part 3b every time immediately before the total wt. is weighed in the first weighing part 3a to be subjected to the calculation of the net wt. due to a control part 6, even when unnecessary matter is bonded to the bucket 2 during wt. sorting operation, wt. sorting accuracy is not lowered. Therefore, highly accurate wt. sorting can be realized over a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a weight sorting device that automatically sorts articles to be sorted based on their weight.

2. Description of the Related Art Conventionally, as shown in FIG. 4, a plurality of buckets 2 are attached at equal intervals to an endless object 1 being conveyed in the direction of arrow A, and a measuring section 3 is disposed outside the system of the endless object 1. The weighed products 4 to be sorted are sequentially put into the bucket 2, and as they are placed in the bucket 2 and pass through the discharge stations 5r and 52.53, the weighed products 4 are weighed in each of the weighing sections 3. The value is compared with the weight rank of the discharge station, and when the bucket 2 arrives at the discharge station with the corresponding weight rank, the bucket 2 is tilted to move to the position of the corresponding discharge station, for example, discharge station 5 in FIG. It is configured so that the sorted items 1 are discharged at positions for each weight rank, such as the positions indicated by □.

Problems to be Solved by the Invention In such a conventional configuration, a weighing section 3 is provided outside the system of the endless body 1, and a product to be sorted 4 is placed on the weighing section 3, and the weighed product to be sorted is 4 from the weighing section 3 to the bucket 2 is required, and the items 4 to be sorted may fall during the transfer, making it unsuitable for workplaces where high-speed weight sorting is required. It had a great composition.

Therefore, a configuration as shown in FIG. 5 can be considered.

In FIG. 5, a weighing section 3 is provided in the system of the endless body 1, and when the passing bucket 2 rides on the weighing section 3, the total weight of the bucket 2 and the items to be sorted 4 placed thereon is measured by the weighing section 3. It is configured to measure at 3. When starting operation,
While the endless body 1 rotates at least once, it is operated at a low speed without any sorting object 4 placed thereon, and the weighed value of the weighing section 3 at this time is transmitted to the first is written into the memory 7 of. Each bucket 2 has an individual code N
1 to N7 are attached, and each time a bucket 2 is weighed in the weighing section 3, the sensor 8 reads the individual code attached to that bucket 2, and the control section 6 reads the individual code at that time in accordance with the individual code. As shown in FIG. 6, the weight value of the bucket 2 with the individual code N2 is G11, the weight value of the bucket 2 with the individual code N2 is G2, etc., as shown in FIG. Written to memory 7. When writing of the weight values 61 to GN for each bucket 2 into the first memory 7 is completed, the endless body 1 is switched to high-speed operation.

In this state, weight sorting is started. When the products 4 to be sorted are placed in the buckets 2, the total weight of each bucket 2 and the products 4 placed thereon are weighed by the weighing section 3, and the individual code of the bucket 2 read by the sensor 8 is calculated. Correspondingly, the weight value of the weighing section 3 at that time is stored in the second memory 9 shown in FIG. 6, and the weight value of the bucket 2 with the individual code N1 is stored in GI01.
The weight value of bucket 2 of individual code N2 is written as G20...

At each discharge station, the individual code of the bucket 2 that has arrived is read by the sensor lO, and the control unit 6 reads the pre-written weight value during low-speed operation from the first memory 7 based on the individual code read by the sensor lO. [Tare weight] is read out, and from the second memory 9, the weighed value [total weight value] during high-speed operation written immediately before is read out, and the net weight of the item 4 to be sorted is calculated. Specifically, when the individual code read by the sensor 10 at the discharge station is N2, the tare weight "G2" is read from the first memory 7, and the total weight value = GQO is read from the second memory 8. Then, the net weight (G2o-G2) is output.

The comparison unit 11 compares the weight rank WN of the discharge station at that time with the net weight (G20G2) calculated by the control unit 6, and when it is determined that (G20G2) is the product to be sorted 4 within the range of WN. has an ejection trigger device 12
is driven to tilt the bucket 2 and discharge the items 4 to be sorted.

Note that the contents of the second memory 9 are updated each time the bucket passes through the weighing section 3, but the tare weight of each bucket 2 written in the first memory 7 during low-speed operation is repeatedly updated until the weight sorting operation is completed. It is read out and used to calculate the net weight.

In the case of the configuration shown in FIGS. 5 and 6, the bucket 2
Since the items 4 to be sorted are weighed in the weighing section 3 after being placed on the holder, the loading and unloading of the items 4 to be sorted is reduced and weight sorting can be carried out at high speed. The tare weight of bucket 2 is read out repeatedly until the weight sorting operation is completed and used to calculate the net weight, so if garbage or other unnecessary objects adhere to bucket 2 during operation, the weight of the This error is the cause of a decline in weight sorting accuracy.

The present invention can realize high-speed weight sorting, and also has two buckets.
To provide a weight sorting device in which weight sorting accuracy does not deteriorate even when unnecessary matter is attached to the weight sorting device.

Means for Solving the Problems The weight sorting device of the present invention includes a plurality of buckets that are attached at predetermined intervals to an endless body that is rotatably driven and on which items to be sorted are placed, and a plurality of buckets that are placed on the conveyance path of the endless body and are placed on the conveyance path of the endless body during conveyance. a first weighing section on which the bucket rests and measures the weight;
A second weighing section is provided on the upper side of the transportation route than the weighing section of the bucket, and the buckets being transported ride on the transport path and measure the weight, and the buckets are sorted into the buckets between the first weighing section and the second weighing section. The net weight of the placed products to be sorted is calculated by subtracting the weight value of the second weighing section from the weight value of the first weighing section for each specific bucket that is configured to hold the target products. A control unit is provided to calculate the net weight of the items to be sorted, which is disposed on the downstream side of the conveyance path from the first weighing unit, and is calculated by the control unit in accordance with each set weight and the passing bucket. The present invention is characterized in that a discharge station is provided to tilt the bucket and discharge the products to be sorted.

According to this configuration, the second measuring section measures the tare weight of the bucket every time immediately before the first measuring section measures the total weight, and the control section measures the tare weight of the bucket every time. The net weight is calculated based on the weight value of the second weighing section.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 to 3.

Components having the same functions as those shown in FIGS. 4 to 6 will be described with the same reference numerals.

As shown in FIG. 1, the weight sorting device of the present invention has two weighing sections, a first weighing section 3a and a second weighing section 3b, disposed within the system of an endless body 1, and products to be sorted. 4 is placed on the bucket 2 at an intermediate point B between the first measuring section 3a and the second measuring section 3b.

When the endless body 1 is operated at high speed to perform weight sorting, the first
The tare weight of each bucket 2 is measured each time in the second weighing section 3b, which is disposed above the weighing section 3a and above the intermediate point B. In the first weighing section 3a located downstream from the intermediate point B, the total weight of each bucket 2 and the items to be sorted 4 placed thereon is weighed.

1st. The weight value of the second weighing section 3a + 3b is the second
The control unit 6 shown in the figure processes as follows.

First, the weight value of the second weighing section 3b is written into the first memory 7 via the control section 6. Individual codes N1 to NN are attached to each bucket 2 in advance, and the second weighing section 3
Each time the bucket 2 is weighed in step b, the sensor 13 reads the individual hood attached to the bucket 2, and the controller 6
Then, the second measuring section 3b at that time corresponds to the individual code.
As shown in FIG. 2, the weight value of bucket 2 with individual code N is G11, the weight value of bucket 2 with individual code N2 is G2, etc., in the first memory 7. written.

The total weight measured by the first weighing section 3a immediately after the weighing at the second weighing section 3b is the total weight of the bucket 2 read by the sensor 8.
The weight value of the weighing unit 3 at that time corresponding to the individual code is stored in the second memory 9 shown in FIG.
The weight value is written as G20...

At each discharge station, the individual code of the arriving bucket 2 is read by the sensor lO, and the control unit 6
Based on the individual code read, the pre-written tare weight is read from the first memory 7, the total weight value is read from the second memory 9, and the net weight of the item 4 to be sorted is calculated. Specifically, sensor 1 at the discharge station
If the individual code read by 0 is N2, the tare weight "G2" is read from the first memory 7, the gross weight value = G20 is read from the second memory 9, and the net weight (
G20-G2) is output.

The comparison unit 11 compares the weight rank WN of the discharge station at that time with the net weight (020G2) calculated by the control unit 6, and determines that (G2° - G2) is the product to be sorted 4 within the range of WN. In this case, the discharge trigger device I2 is driven to tilt the bucket 2 and discharge the items 4 to be sorted.

In this way, the tare weight of the bucket 2 is measured every time in the second weighing section 3b immediately before the total weight is measured in the first weighing section 3a, and is used for calculating the net weight by the control section 6. Even if unnecessary substances adhere to the Baquerat 2 during the weight sorting operation, the weight sorting accuracy does not deteriorate. Therefore, highly accurate weight sorting can be achieved over a long period of time.

In the above embodiment, each time the bucket 2 arrives at each discharge station, the first. The net weight of the items to be sorted 4 was calculated by reading the gross weight and tare weight from the second memory 7.9, but since the weight rank of each discharge station and the order of their arrangement are known, the buckets 2 are The buckets 2 are attached to the endless body 1 at intervals of -, and the intervals between the discharge stations 51 to 53 are configured to be equal to the intervals between the buckets 2, so that when the total weight is measured by the first weighing section 3a, By immediately calculating the net weight of the product 1 based on the tare weight value written in the first memory 3a, and determining at which discharge station the product 1 to be sorted should be discharged, - Eliminates the need to memorize the total weight of each bucket. In this case, each discharge trigger device 12 is selectively driven in synchronization with the determined operating speed of the discharge station and the endless body 1 to be discharged.

In the above embodiment, the endless body 1 was rotated in the vertical direction so that the return path was below the outbound path, but this is because the outbound path and the return path are located on the same plane as shown in FIG. The same applies when the endless body 1 is arranged.

Effects of the Invention As described above, according to the present invention, the first weighing section for measuring the weight when the bucket on which the items to be sorted are placed is disposed within the system of the endless body. Compared to systems that measure the net weight of items to be sorted outside the system,
High-speed weight sorting can be achieved with less loading and unloading of items to be sorted.

Further, a second weighing section is provided on the upper side of the first weighing section for measuring the weight of the bucket that is being transported,
The product is configured to be placed on the bucket between the first weighing section and the second weighing section, and the second weighing section is configured to load the products to be sorted into the bucket between the first weighing section and the second weighing section, and for each specific bucket, the weight value of the first weighing section is calculated from the weight value of the first weighing section. The system is equipped with a control unit that calculates the net weight of the items placed on the bucket by subtracting the weighed value of the weight, so even if unnecessary items adhere to the bucket during weight sorting operation, accurate taring can be performed. It is possible to prevent a decrease in weight sorting accuracy, and it is possible to expect highly accurate weight sorting over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a weight sorting device of the present invention, FIG. 2 is an electric circuit configuration diagram of the same device, FIG. 3 is an external perspective view of another embodiment, and FIG. 4 is a configuration of a conventional weight sorting device. 5 is an explanatory diagram of the problem to be solved by the invention, and FIG. 6 is an electric circuit diagram of the same device. 1... Endless body, 2... Bucket, 3a... First
3b...Second weighing unit, 4...Products to be sorted, 5□-53...Discharge station, 6...Control unit.

Claims (1)

[Claims] 1. A plurality of buckets that are attached at predetermined intervals to an endless body that is driven to rotate and carry items to be sorted; and a first weighing device that is placed on the conveyance path of the endless body and measures the weight of the buckets that are being conveyed. and a second weighing section for measuring the weight of the bucket that is being transported on the upper side of the transport path than the first weighing section;
The product to be sorted is placed on the bucket between the weighing sections, and the weight value of the second weighing section is subtracted from the weight value of the first weighing section for each specific bucket. A control unit is provided for calculating the net weight of the placed items to be sorted, and the control unit is disposed on the lower side of the conveyance path than the first weighing unit, and the control unit A weight sorting device comprising a discharge station that compares the calculated net weight of the articles to be sorted and tilts the bucket to discharge the articles to be sorted.