JPH037790Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The disclosed technology belongs to the technical field of bulk weighing of snack products, bean sweets, and other objects to be weighed in bulk.

<Summary of the gist> This invention, when rapidly and in large quantities weighing objects such as the above-mentioned snack products, allows the objects to be weighed to be intermittently fed into a supply hopper provided at the top of the frame. The object to be weighed discharged from the supply hopper is distributed by a distribution table into a plurality of pool hoppers around the distribution table via each supply feeder, and thus,
The weight is put into the corresponding weighing hopper from each pool hopper, its weight is measured by a weight detector such as a load cell attached to each weighing hopper, and each weight value is combined to determine whether it is equal to the set target value or within the allowable range. This invention relates to an improvement of a combination weighing device in which the combination closest to the value is selected and the objects to be weighed in the weighing hopper related to the selected combination are discharged to the lower collecting chute. During mass metering, a bypass chute is provided between the supply hopper and the distribution table to face a specific set number of supply feeder groups, and the bypass chute has a predetermined control device for the distribution table inside itself. A pool hopper and a bulk weighing hopper are connected in series to form a distributed table. The weighing hopper, which is provided around a part of the periphery of the pool hopper and connected to the lower part of the pool hopper, is used as a small-volume pool hopper and a small-quantity weighing hopper, and can be weighed intermittently by switching the side shutter of the bypass chute. This invention relates to a combination weighing device that is arranged so that objects are distributed and fed from a distribution table to which objects are fed via respective feeders.

<Prior art> As is well known, in the distribution department, various foodstuffs, industrial parts, etc. are weighed according to a set weight.
It is packaged and distributed, but even if the measured weight exceeds the set weight, it is not allowed to fall short. Weighing the set approximate weight is extremely important.

To deal with this, the applicant's many prior inventions,
In the invention, the object to be weighed is fed from a supply hopper, passed through a distribution table, is put into a weighing hopper installed at the bottom of the pool hopper provided around the distribution table, and then weighed by a weight detector such as a load cell. Based on the principles of statistics, a weighing hopper is selected by calculating a combination of weight plus the minimum amount of excess weight, and the object to be weighed is obtained from the selected weighing hopper, made into one unit, and delivered to the next stage.

<Problems to be solved by the invention> However, in this type of prior art, the amount of objects to be weighed that are input from each pool hopper and weighed by the weighing hopper is small, for example, from several kilograms to 10 kg. In a weighing device using the combination weighing method, which selects the optimal combination of weighing hoppers for weighing large weights of several kilograms at once, not only the size of each pool hopper and supply hopper itself, but also the size of the entire device must be extremely large. However, there is a disadvantage that it requires a large space, and of course there is a disadvantage that the manufacturing cost of the device is high.Also, there is a disadvantage that the weight detector of each weighing hopper is complicated.
The disadvantage was that it was difficult to control and manage.

<Purpose of the invention> The purpose of this invention is to solve the problems of mass measurement based on the prior art described above, and to solve the problem of mass measurement based on the above-mentioned conventional technology. It is an object of the present invention to provide an excellent combination weighing device for mass weighing that can be carried out and benefit the field of weighing technology application in the distribution industry.

<Means/effects for solving the problems> In order to solve the above-mentioned problems, the structure of this invention, which is based on the above-mentioned claims for utility model registration, is based on a supply hopper provided on the frame of the device. The object to be weighed is inputted from the upper part of the hopper, and the object to be weighed is supplied in large quantities from the lower end to a set number of supply feeders via a bypass chute, and the mass pool hopper is connected to the set number of supply feeders. The object to be weighed is supplied, and the side shutter, such as a fan-shaped side shutter provided on the bypass chute, is switched at a set timing to drop the object flowing through the bypass chute near the center of the dispersion table at the bottom of the supply hopper. The liquid is distributed uniformly in the circumferential direction, distributed to the large quantity pool hopper and the small quantity pool hoppers around the distribution table, and supplied to the corresponding large quantity weighing hopper and each small quantity measuring hopper, and each small quantity weighing The weighed values at the hopper are totaled, and the difference weight obtained by subtracting this total value from the set weight value is supplied in large quantities to the mass pool hopper as the amount to be rapidly supplied to the mass pool hopper. Meanwhile, the supply to the mass pool hopper is immediately fed into the mass weighing hopper and weighed. When the supply of the object to be weighed to the large-volume pool hopper approaches the set value, it switches to a small-quantity supply, and then stops, and the weight is detected by the weight detector of the large-volume pool hopper, and the weight is compared to the detected weight. The combined weight of small weighing hoppers is determined, and the combination of small weighing hoppers and large weighing hoppers are released to discharge a set weight of objects to be weighed as one unit. It is.

<Embodiment - Configuration> Next, one embodiment of this invention will be described below based on the drawings.

In FIGS. 1 and 2, 1 is a combination weighing device that forms the gist of this invention, and a feeder connected to the tip of a feeding conveyor (not shown) is attached to the upper part of a frame 3 erected on a race 2. A hopper 4 is provided, the middle of which is bent in order to adjust the bridge and pressure, and its lower end is connected to a bypass chute 5, which forms part of the gist of this invention, via a feeder (not shown).

As shown in FIG. 1, the bypass chute 5 is offset from the center of the frame 3 by a predetermined amount.

In addition, a dispersion table 8 having a rectifying plate 7 on the peripheral edge of the tip is provided via a vibration device 6 provided on a sub-frame 3' provided in the middle of the frame 3. For example, feeders 9 for feeding 14 heads are provided radially at equal intervals, each consisting of an upper vibrating device 6' and a trough provided above the vibrating device 6'.

Then, among the feeders 9, 9, etc. of the 14 heads,
The outer ends of the ten supply feeders 9, 9... face the small pool hoppers 10, 10..., which are fixed to the frame 3 and are already known in the applicant's earlier patent invention. In addition,
The lower ends of the small amount pool hoppers 10, 10... are made to face each small amount weighing hopper 12 provided on a load cell 11 as a weight detector also provided on the frame 3. The lower end connects to the collection chute 1 via the discharge chute 13
4, and the collecting chute 14 is arranged to face a unit box 15 provided on the base 2.

In addition, for the remaining feeders 9, 9... adjacent to the supply feeders 9, 9..., two adjacent feeders 9 each have a pair of large-volume pool hoppers 16,
The pair of large-volume pool hoppers 16, 16 face one large-volume weighing hopper 17, and the large-volume weighing hopper 17 is supported by another load cell 11' provided on the frame 3, and
Its lower end faces the collection chute 14 via the discharge chute 18.

Note that 19 is an operation panel of this combination weighing device.

The details of each mechanical part are shown in FIG. 3 and below. First, the bypass chute 5 is
As shown in Figure 5, the bracket 2 provided on the side
0 to be fixed to the frame 3 via
The lower discharge port 21 is connected to four feeders 9, 9...
A shoot surface 22 facing the center of the trough and forming a part of the inner shoot surface 21', forming both side surfaces 23, 23 of integral structure with the shoot surface 22, As shown in Figures 3 and 8,
A side shutter 24 having a semicircular fan shape with a tip bent outward at right angles is mounted on a pair of bearings 25, 25 integrally provided on the chute surface 21', and is provided on the side surface of the bypass chute 5. It is integrally fixed to a rotating shaft 27 connected to a well-known air rotary cylinder 26, and its rotating angle is determined by the posture in which the chute surface 22 is along the chute surface 21' of the bypass chute 5 and the attitude of the dispersion table 8. It is configured to be opened and closed at an angle that can be switched between a position facing the central upper end.

And the lower end discharge port 21 of the bypass chute 5
Like the other feeders 9, 9, the four feeders 9, 9... facing the front are equipped with well-known electromagnetic vibration devices 6', which are installed on the subframe 3' via predetermined springs 25', 25'. It is installed through 2
Each pair of feeders 9, 9 faces a pair of large-volume pool hoppers 16, 16, respectively, and therefore, two feeders 9, 9 face one large-volume pool hopper 16.

Therefore, each large-volume pool hopper 16 is, for example,
It is possible to store an object to be weighed that is slightly less than the set weight of about 8 kg, and as shown in Fig. 6, it is fixed to the frame 3 via a bracket (not shown), and the The upper end of the opening/closing lid 28 relative to the discharge port 27 is supported by a pin on the large volume pool hopper 16, and is also connected to the large volume pool hopper 1.
The air cylinder 26', whose base end is supported by a pin at 6, is supported by a pin at the tip of a rod, so that it can be opened and closed.

Then, the discharge port 27 of the large volume pool hopper 16
is located at its lower end, facing the upper part of the bulk weighing hopper 17, which can store, for example, 10 to 15 kg.

Therefore, the bulk weighing hopper 17 is connected to the bracket 2.
9 is supported by a well-known load cell 11' as a weight detector to detect weight, and an opening/closing lid 2 for the discharge port 27' at the lower end thereof
8' is pivotally supported by a pin on the side surface of the bulk weighing hopper 17, and a lever 30 is mounted on the side surface of the opening/closing lid 28'.
A compression spring 30' is interposed at the upper end of the lever 30 to close the discharge port 27', and the lower end of the lever 30 The tip of the rod of an air cylinder 26'' provided on the frame 3 is exposed to open and close the lid 28'.

<Embodiment - Effect> In the above-described configuration, an object to be weighed (also not shown) is intermittently fed to the upper supply hopper 4 via a conveyor (not shown), and a start button on the operation panel 19 provided on the frame 3 is pressed. Then, the vibration devices 6, 6', 6', etc. of the dispersion table 8 and each supply feeder 9 are operated via the control device, and the object to be weighed descending from the supply hopper 4 is moved to the lower end of the bypass chute 5. From there, two feeders are fed into each pair of large-volume pool hoppers 16, 16 via four feeders 9, 9, . . .

In this case, the side shutter 24 provided on the bypass chute 5 is opened for a set timer time via the control device, and the side shutter 24 provided on the bypass chute 5 is opened for a set timer time.
A part of the object to be measured flowing through is supplied to the center upper end of the dispersion table 8.

The side shutter 24 is closed by a timer after a set time via the control device and is integrated with the bypass chute 5. After that, the bypass chute 5 is connected to a pair of large-volume pool hoppers via four feeders 9, 9... Continue to supply the objects to be weighed to 16 and 16.

Note that the control of the side shutter 24 is not limited to the timer, and the control of the side shutter 24 is not limited to the timer.
For example, photoelectric level sensors (photosensors) are installed on the troughs of the four feeders 9, 9, etc. at the bottom of the feeder 1, and on both storage locations of the objects to be weighed on the distribution table 8. By detecting the storage level of the object to be weighed and inputting the detection signal to the control device, switching control of the side shutter 24 may be performed based only on the storage amount regardless of time.

Therefore, in this case, the large pool hopper 16,16
Since the opening/closing lid 28 for the discharge port 27 at the lower end is opened by the control device via the air cylinder 26', the objects to be weighed supplied from the four feeders 9, 9... It is continuously supplied as it is to the bulk weighing hopper 17.

In addition, the discharge port 2 at the lower end of the bulk metering hopper 17
The opening/closing lid 28' for 7' is closed by the biasing force of the elastic spring 30' due to the retraction of the air cylinder 26' by the control device. will be stored in.

On the other hand, during this period, the objects to be weighed supplied to the upper center of the distribution table 8 are distributed in all directions and are distributed to the small quantity weighing hoppers 12, 12, etc. selected in the previous weighing among the 10 supply feeders 9, 9... Only the liquid is operated and supplied to the corresponding small pool hoppers 10, 10, . . . and stored therein.

Therefore, the opening/closing lids of the small quantity measuring hoppers 12, 12... are also closed, and the small quantity measuring hoppers 12, 12, which were selected for the combination in the previous weighing and have been discharged, are now empty.
Small pool hoppers 10, 10... corresponding to 12...
The object to be weighed is reloaded by opening and closing the lid.

Therefore, the small amount measuring hoppers 12, 12...
are each weighed by the supported load cells 11, 11, . . . , and their detection signals are input to a microcomputer (not shown) of the control device to determine the total sum, and then the difference weight is determined by subtracting the total sum from the set weight. An operation is performed.

On the other hand, in the mass weighing hopper 17, the weight of the loaded object to be weighed is detected over time by the load cell 11', and the detection signal is input to the microcomputer of the control device at a predetermined sampling pitch via a timer. When the weight difference between the total weight of the small-quantity hoppers 12, 12, and the set weight is reached, the large-volume pool hopper 1 is controlled via the control device.
By stopping two or three of the vibrating devices 6' of the four feeders 9, 9, . Tomo1
The vibrating device 6' is controlled so that only the feeder 9 of the table is operated.

Therefore, the weight detection signal of the large quantity weighing hopper 17 is lower than the set weight by 1/2 of the sum of the small quantity weighing hoppers 12, 12 (that is, this is the most accurate combination for small quantity combined weighing). When the weight value approaches a value which is smaller by a weight value with a high probability), the supply to the bulk weighing hopper 17 is terminated by stopping the vibrating device 6' of the feeder 9.

Furthermore, the opening/closing lid 28 is closed via each air cylinder 26' of the large volume pool hopper 16, 16 to open the discharge port 2.
Close 7.

In this way, when the final weight value of the large weighing hopper 17 is detected and its stability is completed, the difference weight (approximately 1/2 of the total weight of the small weighing hoppers) between the detected signal and the set weight value is combined to obtain the target value. The microcomputer of the control device selects the optimal combination of the small-quantity hoppers 12, 12, which corresponds to The control device opens and closes the air cylinders 26' to open the respective opening and closing lids, and the objects to be weighed in the hopper are stored in the unit box 15 from the discharge chute 13 and 18 via the collection chute 14. End the cycle.

The relationship between the above-mentioned cycles will be explained based on the time chart shown in FIG. 7. When the discharge signal from the external output is inputted in A, the small-quantity weighing hopper 12 and the large-volume weighing hopper 17 selected as the combination for which the previous weighing was completed are performed. are both opened and discharge is started. First, the small quantity weighing hopper 12 completes discharging at step B, and then the large quantity weighing hopper 17 completes discharging at step C, thus completing the discharging of the previous weighing amount.

Next, the small amount pool hopper 1 corresponding to the empty small amount weighing hopper 12 is discharged after the set timer time.
0 opens at D, then the large pool hopper 16 opens at E, and both bypass chute 5 opens as described above.
The objects to be weighed are supplied to the mass supply feeders 9, 9 and the distribution table 8 by the operation of the side chute 24 and the corresponding operation of the side chute 24.

At the same time, the microcomputer of the control device operates a sampling timer and detects the increasing weight of the mass weighing hopper 17 at predetermined time intervals by taking in the detection signal from the load cell 11' at predetermined time intervals.

As mentioned above, the small amount weighing hopper 12 starts weighing immediately after the small amount pool hopper 12 is closed, calculates the total value of each weighed value, and further calculates the difference weight between the set weight and the total value. Then, this difference weight is used as the switching weight for ending the mass supply in the mass measurement, and it is detected that the weight of the mass measurement hopper 17 approaches this weight.

Therefore, when the weight of the bulk weighing hopper 17 reaches the switching weight (=difference weight), the bulk feeding by the four feeders 9, 9, etc. is completed, and the weighing becomes stable. At this point, two or three feeders 9, 9 are stopped by the vibration device 6' as described above so that the four feeders 9, 9... are switched to two or one, and the feeders 9, 9 are stopped to supply a small amount. Can be switched.

The flow rate of the small amount supply, that is, how many feeders 9 are operated for the small amount supply, depends on the set weight, the weight planned to be combined and weighed with each small weighing hopper 12, and the required weighing capacity. , measurement accuracy, etc. are preset and programmed.

Then, a slight increase in the weight of the large-volume weighing hopper 17 is detected by sampling using the timer, and at the time of re, the shortage of the set weight is determined by the optimal combined weight value of the small-quantity weighing hopper 12 (1 of the above-mentioned total value). /2) is detected, and the minute supply ends, and the vibration devices 6', 6' of the remaining two or one feeder 9 are stopped, and the minute supply ends.

Opening/closing lid 28 of large pool hopper 16 at the time of
is closed and passes into a stable detection state, at which time the reliable weight of the bulk weighing hopper 17 is detected, whereas the true combined weight value of the small weighing hopper 12 (set weight - mass weighing) weighing weight)
is calculated, and when this combination is completed, preparation for the next stage of supply begins, and at the time of E, a predetermined feeder 9, 9, . The objects to be weighed are stored, and each small-quantity weighing hopper 12 holds the weighed objects to be discharged this time.

When the discharge signal from the outside is input at the time point A', all the selected combinations of the small quantity weighing hopper 12 are
and the opening/closing lid 2 of the bulk weighing hopper 17.
8' opens and all the current weighing amount is discharged, the small amount weighing hopper 12 closes B', and the large amount weighing hopper 17' closes C', the current weighing and discharging is completed, and 1
The cycle is allowed to end.

<Effects of the invention> As described above, according to this invention, a bypass chute is basically provided for a plurality of specific supply feeders in the process of distributing objects to be weighed from a supply hopper to a pool hopper via a distribution table. Furthermore, by providing the bypass chute with a side shutter for the distribution table that can be switched freely, it is possible to supply a large amount of objects to be weighed to a pool hopper corresponding to a specific number of supply feeders, that is, a large quantity weighing hopper. Therefore, when accurately weighing a large amount of objects to be weighed, a large amount of objects to be weighed are supplied to the large amount weighing hopper via the large volume pool hopper in a short period of time up to a set target value, and then a large amount of objects to be weighed are supplied to the large amount of weighing hopper via the large volume pool hopper until the set target value is reached. In order to improve the weighing accuracy, small quantities are fed from a distribution table via a side shutter to a predetermined number of feeding feeders, thereby obtaining a large quantity of objects to be weighed with high precision.

On the other hand, it is now possible to weigh the objects using the small-quantity weighing hopper and find the combined weight value of the target value, which is the difference between the set weight and the large-volume weighing, plus the minimum excess value, and then combine them. By doing so, an excellent effect is achieved in that a large amount of objects to be weighed can be weighed quickly.

In addition, by providing a mass weighing hopper and a mass pool hopper, it is possible to design without providing many weighing hoppers and pool hoppers, and therefore the combination weighing device can be made more compact, and the material cost and manufacturing cost are low. Also, there is an advantage that less maintenance and inspection work is required.

Furthermore, by simply providing one bypass chute having a side shutter between the supply hopper and the distribution table or pool hopper, there is an effect that it is possible to supply a large amount or a small amount of the object to be weighed.

Moreover, since the side shutter can be provided during the bypass chute to allow the object to be measured to flow through the bypass chute, it is possible to supply a small amount while allowing the large amount to flow. There are also advantages.

[Brief explanation of drawings]

The drawings are explanatory diagrams of one embodiment of this invention, in which Fig. 1 is an overall schematic side view, Fig. 2 is a front view of the same, and Fig. 3
The figure is a side view explaining the installation position of the bypass chute with respect to the supply feeder, Figure 4 is a top view of the bypass chute, Figure 5 is a cutaway front view of the same part, and Figure 6 is a view of the large volume pool hopper and mass weighing hopper. FIG. 7 is a side view explaining the installation, FIG. 7 is a time chart, and FIG. 8 is an assembled perspective view of the bypass chute and the side shutter. 3...Frame, 4...Supply hopper, 8...Distribution table, 10, 16...Pool hopper, 1
2, 17... Weighing hopper, 11, 11'... Weight detector, 14... Discharge chute, 1... Combination weighing device, 9... Supply feeder, 24... Side shutter, 5... Bypass chute, 16 ...Mass pool hoppa, 17...Mass measurement hoppa.

Claims (1)

[Claims for Utility Model Registration] (1) A large number of pool hoppers are provided via feeders for each supply to a distribution table connected to a supply hopper provided at the top of the frame, and each pool hopper has a weighing hopper. is supported by a weight detector, and the weighing hopper faces the discharge chute.In the combination weighing device, a set number of supply feeders are faced between the supply hopper and the dispersion table, and the dispersion table is disposed between the supply hopper and the dispersion table. A combination characterized in that a bypass chute is provided with a side shutter that can be freely switched to face, and a large quantity pool hopper and a large quantity measuring hopper are arranged in series in a plurality of supply feeders corresponding to the bypass chute. Weighing device. (2) The combination weighing device according to claim 1, wherein the side shutter is formed into a fan shape in side view forming one side of the chute of the bypass chute. (3) Claims 1 or 3 for registration of a utility model, characterized in that the large quantity measuring hopper is provided in a part of the periphery of the distributed table and a plurality of small quantity measuring hoppers are provided in other parts. The combination weighing device according to item 2. (4) Claims 1 to 3 for utility model registration, characterized in that the above-mentioned distributed table is a vibrating body.
Any of the combination weighing devices listed in Section 1.