JPH0234674B2 - DENSHIHAKARIOMOCHIITASENBETSUSOCHI - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic scale type automatic weight sorting machine that sorts objects to be sorted, such as fruits and vegetables, using an electronic scale and a sorting conveyor with a bucket. .

[Problems to be solved by the prior art and the invention] In general, in the sorting process of fruits and vegetables at a fruit sorting facility, each consignment brought in by the producer to the fruit sorting facility is sorted and For each person, a counting processing slip is issued for the sorted items sorted by grade.

On the other hand, in recent years, objects to be sorted such as fruits and vegetables are transported on a bucket of a sorting conveyor equipped with a bucket, and during transportation, electronic scales using differential transformers, load cells, etc. Electronic scale type weight sorting machines that sort objects by weighing them are becoming popular, and this electronic scale type weight sorting machine can be expected to perform highly accurate sorting because the electronic scale has good weighing sensitivity. While it has its features,
Electronic scales can sensitively detect changes in bucket weight over time due to wear of the bucket on a sorting conveyor with a bucket, as well as changes in bucket weight due to dirt and moisture absorption on the bucket, so when the sorting machine is actually in operation, There was a drawback that accuracy decreased.

The present invention was made to eliminate the above-mentioned drawbacks, and in order to take advantage of the high resolution of electronic scales, the weight value of the empty bucket, that is, the tare weight value, is automatically calculated every time the load of the items to be sorted changes. The object of the present invention is to provide a sorting device that can sort with high precision by checking and correcting the weight value, subtracting the corrected tare weight value from the weighed weight value, and sorting based on the accurate net weight value at all times. It is.

[Means for Solving the Problems] In order to achieve the above object, the present invention has been accomplished as follows.

That is, in the present invention, a large number of bucket carts for placing objects to be sorted one by one are installed at equal intervals, and a predetermined plurality or more of empty bucket carts are placed between the previous cargo port and the next cargo port in the supply section. A sorting conveyor that transports the sorted items that are secured and placed on bucket carts, and a weighing section of the sorting conveyor, which measures the load applied when the bucket travels and sends a signal according to the weighed load. an electronic scale that transmits a sorting signal to the discharge section of the sorting conveyor; A discharge device is provided for each class and receives a signal from the bucket or the top of the bucket when operated to tilt the top of the bucket and the electronic scale, and subtracts the tare weight value stored in the tare weight value storage circuit from the signal to calculate the net value. Calculating the weight value, determining the applicable class of the material to be sorted from the net weight value, transmitting a discharge command signal to the discharge device of the corresponding class in synchronization with the progress to the bucket, and changing the material. Each time a signal is received, the signals corresponding to the weighing loads of each of the predetermined plurality of empty bucket carts are integrated, and the average weight value for each of the predetermined plurality of empty bucket carts is calculated from this integrated value. The present invention is a sorting device using an electronic scale, comprising a calculation device that updates and stores the tare weight value as the tare weight value in the tare weight value storage circuit.

[Example] The present invention will be described below based on drawings showing examples of the present invention.

Reference numeral 1 denotes a sorting conveyor, and a large number of buckets 3 are attached at equal intervals to a chain 2 that runs and rotates endlessly, on which objects 6 to be sorted, such as fruits and vegetables, are placed one by one. Reference numeral 4 denotes a weighing section in the middle of the conveyance path of the sorting conveyor 1, and this weighing section 4 is provided with an electronic scale 5 along the travel trajectory of the bucket 3, and the electronic scale 5 is configured to allow the bucket 3 to run on the electronic scale 5. It measures the load applied during the process and sends a weighing signal corresponding to the weighed load.It measures the weight of the objects 6 to be sorted placed on the bucket 3 together with the bucket 3, and also measures the weight of the objects 6 placed on the bucket 3. Also weigh the weight of the empty bucket 3 that is not placed on it. 7 is sorting conveyor 1
This is a discharge section disposed downstream of the weighing section 4 along the conveyance path of The bucket 3 or the upper part of the bucket 3 is tilted by the device 8 and the objects to be sorted 6 are
are sorted and discharged into receiving boxes 7a classified by sorting class. 9
is a supply section of the sorting conveyor 1 in which objects 6 to be sorted are placed on a bucket 3 on the upstream side of the weighing section 4; is supplied to each consignment of the producer, with each consignment between the previous consignment and the next consignment, i.e. the last to be sorted 6 of the previous consignment and the first to be sorted 6 of the next consignment. A predetermined plurality or more of empty bucket carts 3 are secured between each container and each cargo is placed on the bucket cart 3. Reference numeral 10 denotes a change signal push button switch serving as a change signal transmitting means for transmitting a change signal every time the last object 6 of each consignment passes through the electronic scale 5, and is classified into classes. It is also used to count the number of objects 6 to be sorted.

Reference numeral 11 denotes an amplifying device that amplifies the weighing signal output from the electronic scale 5 and converts it into a digital signal, and outputs a pulse signal corresponding to the weighing load as an output signal.
Reference numeral 12 denotes a calculation device, which includes a calculation/judgment section 12a and a sorting control section 12b.
a is composed of an arithmetic determination circuit 13, a sorting division weight value setting circuit 14, and an empty bucket weight value storage circuit 17 as a tare weight value storage circuit for updating and storing the tare weight value, which is the essential part of the present invention. The sorting control unit 12b is composed of a shift circuit 15 that transmits a discharge command signal 21 in synchronization with the advance of the bucket 3 to the discharge device 8 at a predetermined discharge position, and a discharge position setting circuit 16. In some cases, a counting processing circuit is provided, but in this explanatory diagram (FIG. 3), it is provided separately from the arithmetic unit 12. 18 is a counting processing device provided separately from the arithmetic device 12, and 19 is a printer for printing data on a slip. Reference numeral 20 denotes a clock signal transmitting switch which transmits a clock signal synchronized with the progress of each bucket 3 to the arithmetic unit 12. 21 tilts the upper part of the bucket 3 to remove the objects 6 to be sorted on the bucket 3.
This is a discharge command signal sent from the shift circuit 15 to the discharge device 8 that discharges the liquid.

To explain in more detail the sorting device configured as above, various structures that have been proposed in recent years can be used for the sorting conveyor 1 and the electronic scale 5, but the combination of the bucket 3 and the chain 2 is as follows.
Preferably, they are assembled in a loosely fitted state, so that when the bucket 3 runs on the electronic scale 5, the vibrations of the chain 2 that sometimes occur are not transmitted to the bucket 3, and the parts placed on the bucket 3 and the bucket 3 are prevented from being transmitted to the bucket 3. It is preferable that the weight of the sorted object 6 can be accurately measured by the electronic scale 5. The electronic scale 5 is a scale using a load cell, a scale using a differential transformer, a scale using an electromagnetic force balance method using a force coil, etc., and weighs by running the bucket 3 on a measurement pedestal. In addition, there is a method in which a small conveyor is formed in the measuring pedestal portion to receive the bucket 3 and the weighing device is weighed while traveling. When the bucket 3 is run on the electronic scale 5, the weighing signal obtained from the electronic scale 5 is amplified by the amplification device 11, converted into a digital signal, and a pulse signal corresponding to the weighing load is sent to the calculation judgment circuit of the calculation device 12. 13.

The arithmetic device 12 receives the information sent from the electronic scale 5 via the amplification device 11 by the arithmetic judgment circuit 13.
The tare weight value stored in the empty bucket weight value (tare weight value) storage circuit 17 is subtracted from the pulse signal corresponding to the total weight of the bucket 3 and the objects to be sorted 6 on the bucket 3 to obtain the net weight part (tare weight value). The calculated weight value is compared with the sorting category weight value set in the sorting category weight value setting circuit 14, the applicable class of the sorted article 6 is determined, and the class signal is determined. The ejection device 8 corresponds to the position of the corresponding class set in the ejection position setting circuit 16 by the clock signal sent from the clock signal transmission switch 20 in synchronization with the movement of the bucket 3 in the shift circuit 15. The discharge command signal 21 is shifted in synchronization with the progress of the bucket 3 to operate the discharge device 8, the bucket 3 or the upper part of the bucket 3 is tilted, and the material to be sorted 6 is placed on a predetermined receiving box 7a of the discharge section 7. The waste is then discharged and sorted and discharged according to class.
The counting processing device 18 stores the number of objects to be sorted 6 for each class each time the corresponding class of the objects to be sorted 6 is determined by the arithmetic judgment circuit 13, and stores the number of objects to be sorted 6 for each class, and stores the number of objects to be sorted 6 in the bucket carrying the last object to be sorted 6 in the consignment. 3a has passed over the electronic scale 5 of the weighing section 4, the change signal push button switch 10 provided on the weighing section 4 is pressed and the switch 1 is pressed.
0 sends a reload signal to the arithmetic judgment circuit 13 of the arithmetic unit 12, and the sorted number data for each class stored in the counting unit 18 is printed out on a slip by the printer 19. The function may be built into the arithmetic unit 12, or may be provided separately as shown in FIG. 3.

Further, to explain the main part of the present invention, when loading the objects 6 to be sorted into the bucket 3 by load in the supply section 9 of the sorting conveyor 1, the present invention provides for That is, a predetermined number or more of empty buckets 3 are secured and placed between the last item 6 of the previous consignment and the first item 6 of the next consignment, and
Every time the last object to be sorted 6 of each consignment finishes passing over the electronic scale 5, a change signal is sent from the change signal push button switch 10 to the arithmetic judgment circuit 13 of the calculation device 12, and the arithmetic judgment circuit 13 Each time a replacement signal is received, the calculation/judgment circuit 13 calculates the individual weights of the predetermined plurality of empty buckets 3b (assumed to be five, for example) that are weighed by the electronic scale 5 and sent via the width intensifying device 11. Integrate the pulse signals according to the load, divide the integrated value by the number of weighed empty buckets (5) to calculate the average weight value for each empty bucket 3b, and use the calculated average weight value as the tare weight value. The empty bucket weight value (tare weight value) is updated and stored in the memory circuit 17 from the arithmetic judgment circuit 13. In this way, each time a reload signal is sent, the empty bucket weight value (tare weight value) is updated and stored in the empty bucket storage circuit 17. The newly calculated tare weight value is updated and memorized by clearing the tare weight value that has been calculated, and the weight of the bucket 3 may change due to gradual wear due to long-term sorting, or the weight of the bucket 3 may change. Even if the weight of the bucket 3 changes due to dirt attached to the bucket 3 or moisture absorption by the bucket 3, the newly corrected tare weight value (empty bucket weight value) is subtracted from the weighed weight value each time the cargo is changed. This method calculates the net weight value and sorts based on the net weight value, and it is designed to ensure accurate sorting without any sorting errors due to changes in the weight of the bucket 3. .

In order to calculate the average weight of empty buckets 3, it is ideal to go around all the buckets.
Since the objects to be sorted 6 cannot be supplied for 2 to 3 minutes during one round of the machine, the sorting efficiency decreases.
Therefore, in the present invention, when normally sorting, there is a gap of about 7 to 10 buckets, a distance of about 1 to 1.5 meters, and a time of about 2 to 3 seconds between the previous cargo and the next cargo. Therefore, the empty bucket 3 during this period is utilized, and in this way, there is no reduction in efficiency.

[Effects of the Invention] As described above, the present invention provides a system in which a predetermined plurality or more of empty bucket carts are secured between the previous cargo port and the next cargo port in the supply section of the sorting conveyor, and the cargo is placed on the bucket cart for each cargo port. The objects to be sorted are conveyed by the conveyor, and during the conveyance, the load of the objects to be sorted on the bucket is weighed with the electronic scale provided in the weighing section, and a signal corresponding to the weighed load is sent to the calculation device, In the arithmetic unit, the tare weight value stored in the tare weight value storage circuit is subtracted from the signal from the electronic scale to calculate the net weight value, and the objects to be sorted are sorted based on the net weight value. , each time the computing device receives a reloading signal transmitted from the reloading signal transmitting means every time the last item to be sorted in each consignment finishes passing through the electronic scale, in the computing device,
Integrate signals corresponding to the weighing loads of each of the predetermined plurality of empty buckets, calculate the average weight value for each of the predetermined plurality of empty buckets from this integrated value, and use the average weight value as the tare weight value. Since the tare weight value storage circuit is updated and stored, the tare weight value is automatically corrected to the tare weight value at that time each time the load of the items to be sorted is changed, and the tare weight value is automatically corrected to the correct net weight value of the items to be sorted. Since it can be sorted based on the change in bucket weight over time due to bucket wear,
It is possible to prevent a decrease in sorting accuracy caused by changes in the weight of the bucket due to dirt and moisture absorption in the bucket, and to take advantage of the high-precision weighing function that is a feature of electronic scales, it is possible to sort objects with high precision. It is effective, and in turn, it has a great effect on increasing the commercial value of the sorted items such as fruits and vegetables.

[Brief explanation of drawings]

The drawings are all diagrams for explaining the embodiments of the present invention, and FIG. 1 is an overall plan view of the sorting device, FIG. 2 is a schematic side view of FIG. 1, FIG. 3 is an explanatory view of the main parts, and FIG. 4 FIG. 2 is an explanatory diagram illustrating the change of cargo ports on the sorting conveyor. FIG. 5 shows a flowchart of a sorting device that calculates and stores the average weight of empty bucket carts based on a reload signal. 1... Sorting conveyor, 2... Chain, 3... Bucket, 4... Weighing section, 5... Electronic scale, 6... Item to be sorted, 7
...Discharge section, 8...Discharge device, 9...Supply section, 10...Change signal push button switch, 11...Width increasing device, 12...
Arithmetic device, 13... Calculation determination circuit, 14... Sorting division weight value setting circuit, 15... Shift circuit, 16... Discharge position setting circuit, 17... Empty bucket weight value storage circuit, 18... Counting processing device, 19... Printer, 2
0...Clock signal transmission switch, 21...Ejection command signal, 7a...Receiving box, 12a...Calculation/judgment unit, 12
b... Sorting control section.

Claims (1)

[Claims] 1 A large number of buckets are installed at equal intervals for loading the items to be sorted one by one, and a predetermined number or more of empty buckets are secured between the previous consignment and the next consignment in the supply section, and the consignment is separated. Separately, there is a sorting conveyor that conveys the objects to be sorted that are placed on a bucket, and an electronic scale that is installed in the weighing section of the sorting conveyor and that weighs the load applied when the bucket runs and sends a signal according to the weighed load. , a reloading signal transmitting means provided in the weighing section and transmitting a reloading signal every time the last object to be sorted in each consignment passes through the electronic scale; and a reloading signal transmitting means provided in the discharge section of the sorting conveyor for each sorting class. receives a signal from the electronic scale, and calculates the net weight value by subtracting the tare weight value stored in the tare weight value storage circuit from the signal. and determining the applicable class of the material to be sorted from the net weight value,
Sending a discharge command signal to the discharge device of the corresponding class in synchronization with the progress of the bucket, and each time the reloading signal is received, the signal corresponding to the weighed load of each of the predetermined plurality of empty buckets is integrated. and an arithmetic device that calculates an average weight value for each of the predetermined plurality of empty buckets from this integrated value, and updates and stores the average weight value in the tare weight value storage circuit as the tare weight value. A sorting device that uses a distinctive electronic scale.