JPH0480625A - Weight sorter - Google Patents

Abstract

PURPOSE:To enable improvement of operability, improvement of a sorting efficiency, etc. by a construction wherein a vacancy rate determining element detects the vacancy rate of a bucket in a specified section and a control element adjusts the running speed of an endless-form body automatically in accordance with the degree of the vacancy rate. CONSTITUTION:A radio response tag T having first and second memories incorporated is fitted to each bucket 2. A read-write device 8 executing reading and writing for the tag T fitted to the bucket 2 in the course of weighing is fitted in the vicinity of a weighing machine 7 and a weighed value is inputted to the device 8. The content written in the second memory of the tag T through the device 8 is sent each time to a register 15 of a vacancy rate determining element 14 and accumulated therein. In a determining part 16 of the vacancy rate determining element 14, an actual vacancy rate ES is computed, and when the vacancy rate ES exceeds a set vacancy rate ER, an instruction is given through a control element 17 so as to reduce the number of revolutions of a driving motor 18 of an endless-form body 1 for unit time. When the vacancy rate ES turns smaller than the vacancy rate ER in the course of operation, the determining element 14 gives an instruction through the control element 17 so as to increase the number of revolutions of the motor 18.

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. 3, a conventional technique disclosed in Japanese Unexamined Patent Application Publication No. 59-78583 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 7 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 transferred to the discharge station. 41 to 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 item arrives, the bucket 2 is tilted and the items to be sorted are discharged at the position of the corresponding discharge station, such as the position of discharge station 4□ in Fig. 3, for each weight rank. .

Problems to be Solved by the Invention In such a conventional configuration, the traveling speed of the endless body 1 is constant, and the operator moves the sorting object to the weighing station 3 at a speed commensurate with the traveling speed of the endless body 1. They are working to send goods.

However, this type of operation in which the endless body 1 moves at high speed even though the worker is slow in feeding the items to be sorted, has a problem in that the operating noise of the endless body 1 is loud.

In addition, the weighing station 3 is not provided outside the system of the endless body 1, but is provided within the system of the endless body 1, so that the operator can directly place the items to be sorted one after another onto the moving bucket 2, and If we assume a device that uses a weighing machine installed inside the bucket to measure the load of the bucket while it is running and sort it by weight, the worker will have to work while being kept up with the running speed of the endless body 1. Workability is confusing. Regarding this point, it may be possible to improve work efficiency by setting the traveling speed of the endless body 1 to be slow, but in this case, if the worker becomes accustomed to the work of placing the items to be sorted into the bucket 2, the work efficiency may be improved. A situation occurs in which the operator's movement precedes the movement of the endless body 1, and the efficiency of sorting decreases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a weight sorting device that has good workability from the start to the end of the work and can improve the reduction in sorting efficiency.

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 weight of the items to be sorted placed in the passing buckets is compared with the weight of the items to be sorted, and the items to be sorted are discharged from the buckets at the corresponding discharge station, and the items to be sorted are placed in each of the buckets in a specific section. The present invention is characterized in that it includes a vacancy rate determination section that detects whether the endless body is placed or not, and a control section that adjusts the running speed of the endless body according to the detected vacancy rate.

According to this configuration, the vacancy rate determination section detects the vacancy rate of the bucket in a specific section, and the control section automatically adjusts the running speed of the endless body according to the size of the vacancy rate. Specifically, when the vacancy rate increases, the running speed of the endless body is changed to be slow, and when the vacancy rate decreases, the running speed of the endless body is changed to a farther distance.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. Components having the same functions as those in FIG. 3 showing the conventional example will be described with the same reference numerals.

1 and 2 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 outward 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, on the outward path 5 of the endless body 1, discharge stations 4, - 44 are arranged along the conveyance direction C, and on the return path 6, discharge stations 45 - 47 are arranged. A weighing machine 7 is installed on the upper side of the discharge stations 41 to 44 on the outgoing route 5. 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 with no products to be sorted placed in any of the buckets 2, and the weight value (tare weight value G,) of each bucket 2 at that time on the weighing machine 7 is as follows. It is written to the first memory of the radio response tag T attached to its own bucket 2 via the read/write device 8 . 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. is calculated, and the net weight value Go is written to the second memory of the radio responsive tag T attached to its own bucket 2 via the read/write device 8.

The discharge stations 4□ to 47 are each provided with a reading device 9 for the radio response tag T. 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. and each discharge station 41
~4□ comparators C1 to C7.

As shown in FIG. 1, each of the comparators 01 to C7 has a weight rank specified as a reference value by the weight rank management section 11 of the control section 1O. Here, immediately after the start of operation, weight ranks 21 to Z7 are given as shown in Table 1 below.

[Table 1] Here, Z, to Z7 are given in the order of weight from smallest to largest: Z1, Z2, Z3, Z4, Z5, Z6, Z7. The discharge triggers Q1 to Q7 provided in the discharge stations 4 and 47 are connected to the respective comparators 01 to C7.
is operated based on the output of

Specifically, the comparator C1 receives the net weight value G read out by the reading device 9. is compared with the weight rank Z1 set by the control unit 10, and if Go≦Z IH, the discharge trigger Q1 is activated and the discharge station 4. The bucket 2 located at is tilted, and the items to be sorted placed thereon are discharged into the container 131. 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 Z
IH 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≦22□, the discharge trigger Q2 is activated, the bucket 2 located at the discharge station 42 is tilted, and the items to be sorted are discharged into the container I32. Z2L is the lower limit value (=21H) of weight rank Z2, and Z21( 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. 1 and 2, the discharge trigger Q2. Q7 is driven, and the bucket 2 that has arrived at its discharge station 4°, 47 is tilted.

The content written to the second memory of each wireless response tag T via the read/write device 8 is checked by the vacancy rate determination unit 14 each time.
The data is sent to the register 15 and stored therein.

This register 15 contains the net weight value G of a plurality of "'N" items to be sorted. are stored, and when a specified number of data are stored, the contents are updated on a first-in, first-out basis. In the determination unit 16 of the vacancy rate determination unit 14, the net weight value G of each register 15 is determined. If the number of buckets 2 below the specified weight value is “n”, determine whether the weighed value exceeds the specified weight value near zero ° The vacancy rate Es is calculated, and if the actual vacancy rate E8 exceeds the set vacancy rate E6, the number of rotations per unit time of the drive motor 18 of the endless body 1 is slowed down via the control unit 17. If the actual vacancy rate E5 becomes small during the weight sorting operation, the vacancy rate determination unit 14
gives an instruction to increase the rotation speed of the drive motor 18 via the control unit 17.

In this way, when the vacancy rate Es is large, the traveling speed of the endless body 1 is automatically switched to a slow state, so that the operating noise of the endless body 1 can be reduced.

Further, when the emptying rate Es is small, the traveling speed of the endless body 1 is automatically switched to a high state, so that it is possible to prevent a decrease in the efficiency of weight sorting.

In the above embodiment, one setting vacancy rate ER is provided and it is determined whether the number of rotations per unit time of the drive motor 18 of the endless body 1 is slowed down or increased, and the running speed of the endless body 1 is determined. Although the control is performed in two stages, the traveling speed of the endless body 1 can also be controlled in multiple stages by providing a plurality of set vacancy rates ER and determining which set vacancy rate range it belongs to.

Effects of the Invention As described above, according to the present invention, a vacancy rate determination unit is provided to detect whether or not items to be sorted are placed in each of the buckets in a specific section. Accordingly, a control unit for adjusting the running speed of the endless body is provided, so that the running speed of the endless body is automatically adjusted according to the size of the vacancy rate, and when the vacancy rate becomes large, the running speed of the endless body is stopped. If the speed is slowed down and the vacancy rate is reduced, the running speed of the endless body can be increased, and workability can be improved.

In addition, the vacancy rate increases at the start of operation when the workers are not used to the work, but in this case, the traveling speed of the endless object is slowed down until the workers become accustomed to the work and the vacancy rate decreases. The operation noise of the endless body can be reduced.

When the worker gets used to the work and the vacancy rate decreases, the traveling speed of the endless body can be increased, so that there is no reduction in sorting efficiency.

[Brief explanation of the drawing]

FIG. 1 is a plan view and electrical circuit diagram of the main parts of an embodiment of the weight sorting device of the present invention, and FIG. 2 is a front view of the same weight sorting device.
FIG. 3 is a front view of a conventional weight sorting device. 1...Endless body, 2...Bucket, 4□~47...
- Discharge station, 7... Weighing machine, 8... Reading/writing device, 131-137... Container, 14... Empty rate determination section, +5... Register, 16... Judgment section, 18
...A drive motor for an endless body.

Claims (1)

[Claims] 1. Discharge stations are provided in the order of weight rank along the transport route of the bucket, and the products to be sorted are placed on the buckets and transported, and the products to be sorted placed in the weight ranks of the discharge stations and the passing buckets are an vacancy rate determination unit configured to compare the weights of the items and discharge the items to be sorted from the buckets at the corresponding discharge station, and to detect whether or not the items to be sorted are placed in each of the buckets in the specific section; 1. A weight sorting device comprising: a control section for adjusting a running speed of the endless body according to a detected empty space ratio.