JPH0481621A - Sorting apparatus of weight - Google Patents

Abstract

PURPOSE:To meet the requirement for high-speed weighing and high-precision weighing by comprising a load conversion element which weighs a bucket in the course of movement and outputs an analog signal corresponding to a weighed value and a filter which processes the aforesaid analog signal. CONSTITUTION:A weighing device 7 is disposed in a route of conveyance of an endless-form body 1, and therefore high-speed weighing and high-speed weight sorting can be realized. Moreover, the passing characteristic of a filter 22 is changed automatically in accordance with the speed of operation of the endless- form body 1. When a low-pass filter is used as the filter 22, therefore, the cutoff frequency of the low-pass filter becomes high in accordance with the speed of operation of the endless-form body 1 when the body 1 is operated at a high speed, the rise of an output signal 22 becomes fast and the weights of buckets 2 passing one after another can be measured. When the endless-form body 1 is operated at a low speed, the cutoff frequency is modified automatically to be low and a noise component on the occasion of low-speed weighing is removed sufficiently.

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.

As shown in FIG. 5, a conventional technique disclosed in Japanese Unexamined Patent Application Publication No. 59-7G583 is provided with an endless body 1 that is rotatably driven in the vertical direction [in the direction of arrow B] with respect to an installation location A. A plurality of buckets 2 are attached to a 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 the products are placed on the buckets 2 and sent to discharge stations 41 to 4N. When passing through the bucket, compare the weight value of each item to be sorted with the weight rank of its discharge stage, and move the bucket 2 to 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. 5, for each weight rank. .

Problems to be Solved by the Invention In such a conventional configuration, the weighing station 3 is provided outside the system of the endless body 1, and when the products to be sorted are transferred from the weighing station 3 to the bucket 2, the sorting from the bucket 2 is carried out. This configuration was unsuitable for workplaces where high-speed weight sorting is required, as items could fall.

Therefore, it is conceivable to increase the speed of the sorting process by disposing a weighing station 3 within the system of the endless body 1 and weighing the articles to be sorted in each bucket.

However, it is not possible to obtain reliable weight values using a general weighing device as shown in FIG.

In FIG. 6, the total weight of the bucket carrying the items to be sorted and passing through is measured by the load cell 20, and its analog signal is input to the low-pass filter 22 via the amplifier 21 to remove noise components, and the output of the low-pass filter 22 is Signal A/
The data is input to a D converter 23, converted into digital data, and processed by a microcomputer 24 to obtain a weight value. In such a configuration, if the pass characteristics of the low-pass filter 22 are determined so as to remove the noise components generated when the endless body 1 rotates at high speed, it can be used for almost any purpose when the endless body 1 is rotating at high speed. Although it is possible to obtain a weight value with an accuracy of It is something that cannot be done.

SUMMARY OF THE INVENTION An object of the present invention is to provide a weight sorting device that can carry out high-speed weighing and high-speed weight sorting, and can operate an endless body at low speed to realize high-accuracy weight sorting.

Means for Solving the Problems The weight sorting machine 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 arranged on the conveyance path of the endless body and placed on each bucket. a weighing device that measures the weight of the items to be sorted while being placed and being transported;
A discharge station that is arranged on the conveyance path of the endless body and compares each set weight with the weighed value of the product to be sorted placed on the passing bucket, and tilts the bucket to discharge the product to be sorted. and a weight converter that weighs a moving bucket and outputs an analog signal according to the weighed value, and a filter that processes the analog signal, and The present invention is characterized in that the weight of the item to be sorted is determined based on the output signal of the filter, and the passage characteristic of the filter is switched in accordance with the traveling speed of the endless body.

Effect: According to this configuration, since the weighing device is disposed on the conveyance path of the endless body, high-speed weighing and high-speed weight sorting can be realized. Furthermore, since the filter's passage characteristics are automatically changed according to the operating speed of the endless body, if the filter is a low-pass filter, the cutoff frequency of the low-pass filter will change when the endless body is operated at high speed. It increases in accordance with the operating speed of the endless body, the rise of the output signal of the filter becomes faster, and the weight of buckets passing one after another can be measured. When the endless body is operated at low speed, the cutoff frequency is automatically adjusted to a low value to sufficiently remove noise components during low speed metering.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 to 3. Components having the same functions as those in FIG. 6 showing the conventional example will be described with the same reference numerals.

In the weight sorting device of the present invention, as shown in FIGS. 2 and 3, the endless body 1 is arranged to rotate horizontally with respect to the installation location A, so that the outward path 5 and the backward path 6 are in the same plane. be. A plurality of buckets 2 on which items to be sorted are placed are attached to the endless body 1 at predetermined intervals. Here, the outgoing path 5 of the endless body 1 includes discharge stations 410 to 4 along the conveying direction C.
-40 is arranged, and a discharge station 411 is placed on the return route 6.
~441 are arranged. A weighing device 7 is installed on the upstream side of the discharge stations 410 to 44° on the outgoing path 5. Discharge station 410~440141□~4
Ejection triggers 810 to 84Q+ 81 provided at 4°
1 to 841 are the weight values of the weighing device 7 and each discharge station 4. The vehicle is operated as follows based on the weight rank set for each vehicle.

The tare amount of each bucket 2 is written in the tare memory in advance. A first position detector for detecting the passage of each bucket 2 and a second position detector for detecting that a specific one of the buckets 2 has passed a position immediately before the weighing device 7 are provided. The counting contents of the counter are reset when the second position detector detects the first bucket 2□ as the specific bucket. The count content of this counter is incremented every time the bucket 2 passes, and based on the count value of this counter, the tare weight amount is read from the tare memory, and the tare weight of each bucket is read out from the weight value of the weighing device 7. The net weight value is calculated by correcting the A rotary encoder is attached directly or indirectly to the motor that rotationally drives the endless body 1, and specifies the bucket that has reached each discharge station 410 to 440+411 to 441 in synchronization with the conveyance of the endless body 1. Then, the net weight value of the items to be sorted placed in the bucket and each discharge station 410 to
The weight rank, which is the set weight for each of 44o+4++ to 441, is compared, and when a bucket carrying a sorted item that matches the weight rank arrives at its own discharge station, a discharge trigger 8. . ~84o and 8□1~841 are driven to tilt the bucket and discharge the items to be sorted at an appropriate discharge station.

In these Figures 2 and 3, the discharge trigger is 8□. , 83° are driven, and the discharge station 420+ is then driven.
The bucket arriving at 431 is tilting.

The bucket 2 is attached to the endless body 1 as shown in FIG.

In FIG. 4, the upper part of the fixed side II and the upper part of the movable side 12 are connected by a link 13a, the lower part of the fixed side +1 and the lower part of the movable side 12 are connected by a link +3b, and the rear end of the link 13a is connected to the endless body 1. The guide rail 10 is extended inward and engaged with the back surface of the guide rail 10. On the back side of the outlet 15 of the bucket 2,
A projection 16 is provided. A notch 17 is formed in the protrusion 16 on the discharge port 15 side. The movable side 12 which is on the side of the endless body 1 has a first shaft I8 on its upper part as an engagement piece with which the notch 17 of the protrusion 16 engages, and a first shaft I8 that engages with the first shaft 18. A second shaft 19 is provided as an abutting piece that restricts the bucket 2 from moving toward the inside of the endless body 1, and here the second shaft 19 abuts against the protrusion 16 and is mounted. The cutout portion I7 of the bucket 2 is restricted from moving in a direction away from the first shaft 18. Movable side 12
A roller 14 is attached to the bottom of the bucket 2, and when it passes through the weighing device 7, it rides on the platform and lifts it upward to measure the total weight of the bucket 2 and the items to be sorted placed thereon. are being weighed.

The weighing device 7 is constructed as shown in FIG. The load acting through the roller 14 is converted into an analog signal by a load cell 20 serving as a load converter. The analog signal that has passed through the amplifier 21 is passed through the low-pass filter 22a at the subsequent stage.
, 22b, and 22c to the A/D converter 23. Here, the low-pass filters 22a to 2
2c, each of the cutoff frequencies f, , f2 . f3 is set to ft>f2>f3. Switches S are provided on the input and output sides of the low-pass filters 22a to 22c.

and S II+ S20 and S2++ 830 and 831
is provided, and S 10'' S 31 is controlled as follows.

The traveling speed of the endless body 1 is detected by the rotary encoder 25 and inputted to the microcomputer 24,
Rotary encoder 2 in microcomputer 24
Based on the signal 5, the endless body 1 moves to "high speed""mediumspeed"
Determine in which range of ``low speed'' the traveling speed is,
Switch S 10 via filter control section 26
-831 as shown in the table below.

In this way, when the endless body 1 is operated at high speed and high-speed weight sorting is performed, the switches S10 and SII are turned "1 ON", and the cutoff frequency of the analog signal becomes f.
It passes through the highest low-pass filter 22a at l, removes noise components, and inputs it to the microcomputer 24 via the A/D converter 23, determines the weight value, and subtracts the weight of bucket 2 as described above. The correction process is executed and the net weight value of the items to be sorted is output. When the endless body 1 is operated at a low speed to perform low-speed weight sorting, the switches S30 and 83□ are turned "ON", and the analog signal is passed through the low-pass filter 2 with the lowest cutoff frequency f3.
2c, noise component removal processing is performed.

In this way, the cutoff frequency of the filter provided upstream of the A/D converter 23 is automatically switched to an appropriate one according to the operating speed of the endless body 1, so that high-speed weighing and weight sorting can be performed. It is also possible to perform low-speed weighing to achieve high-precision weight sorting.

In the above embodiment, the switch S,. ~S3+ was switched to selectively use one of the plurality of filters 22a to 22c, but this was configured so that the time constant of a single filter was switched according to the operating speed of the endless body 1. You can also.

Effects of the Invention As described above, according to the present invention, a weighing device for measuring the weight of the items to be sorted placed in each bucket and being conveyed is placed in the conveyance path of the endless object, so that sorting is not performed as in the conventional method. It is suitable for high-speed weight sorting as there is no need to transfer the target items.

Furthermore, the weighing device is configured with a load conversion unit that weighs a moving bucket and outputs an analog signal according to the weighed value, and a filter that processes the analog signal, and converts the output signal of the filter into an output signal. The weight of the product to be sorted is determined based on the weight of the product to be sorted, and the passage characteristics of the filter are changed according to the traveling speed of the endless body, so that high-speed weighing and low-speed weight sorting required for high-speed weight sorting can be achieved. It is possible to satisfy the high precision measurement required by

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a weighing device according to 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 bucket of the same device. 5 is a front view of a conventional weight sorting device, and FIG. 6 is a configuration diagram of a conventional weighing device. 1...Endless body, 2...Bucket, 4□. ~44o
, 4.1-44. ... Discharge station, 7... Weighing device, 20... Load cell [Load converter: l, 2
2a to 22c...Low pass filter [filter], 2
3... A/D converter, 24... Microcomputer, 25... Rotary encoder, 26... Filter control i, s, o-531... Switch.

Claims (1)

[Claims] 1. A plurality of buckets are attached at predetermined intervals to an endless body that is driven to rotate and carry items to be sorted, and a system is placed on the conveyance path of the endless body to measure the weight of the items to be sorted that are placed in each bucket and are being transported. A weighing device is used to measure the objects to be sorted by comparing the set weights of the weighing devices placed on the conveyance path of the endless body with the weighed values of the objects to be sorted placed on the passing bucket, and tilting the bucket to select the objects to be sorted. A discharge station for discharging the goods is provided, and the weighing device is equipped with a load conversion section that weighs the moving bucket and outputs an analog signal according to the weighed value, and a filter that processes the analog signal. A weight sorting device configured to determine the weight of a product to be sorted based on an output signal of the filter, and to switch a passage characteristic of the filter according to a traveling speed of the endless body.