JP2574676B2 - Combination weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field of the Present Invention> The present invention relates to a combination weighing device used when packaging objects having individual weight variations into a target amount and performing packaging or the like. .

<Prior Art> (FIGS. 5 and 6) In this type of combination weighing device, an object to be weighed supplied from a supply device is housed in a plurality of weighing hoppers and weighed, and a target amount is measured based on these weighed values. Select a combination close to
The objects to be weighed close to the target amount are put together by discharging the objects to be weighed selected in this combination to the collecting chute all at once.

Thus, in such a combination weighing device, when there is one collecting chute, until the objects to be weighed discharged from the weighing hopper are all discharged from the discharge port of the collecting chute, the next selected combination is used. The object to be weighed cannot be discharged.

Since the operation efficiency of the combination weighing device largely depends on the discharge time, there is a limit to the operation efficiency with one collecting chute.

For this reason, as shown schematically in FIGS. 5 and 6,
Conventionally, there has been a combination weighing device in which two independent collecting chutes are provided.

In the example shown in FIG. 5, the inner chute 1 and the outer chute 2 are formed concentrically, and a plurality of weighing hoppers (or auxiliary hoppers) arranged along the edge of the inner chute 1.
.. Are provided with two discharge gates 3a, 3b which open and close in a direction perpendicular to a tangential direction of one edge of the inner chute.

Therefore, the objects to be weighed stored in the weighing hoppers 3, 3, ... are discharged to the discharge gate 3a inside the weighing hopper 3.
Is opened to the inner chute 1 and the outlet 1a
When the outer discharge gate 3b is opened, it is discharged to the outer chute 2 and discharged to the outside through the discharge port 2a. Emission is possible.

In the example shown in FIG. 6, left and right collecting chutes 4 and 5 having a semicircular opening are adjacent to each other, and a plurality of weighing hoppers 6 are provided along the edges of the collecting chutes 4 and 5, respectively.
6,..., 7, 7,.

Therefore, the weighed objects stored in the weighing hoppers 6, 6,... On one side are discharged to the collecting chute 4 on the left side when the discharge gate 6a that opens and closes inward is opened. The objects to be weighed discharged from the outside from the machine 4a and stored in the other weighing hoppers 7, 7,... Are similarly discharged to the collecting chute 5 on the right side when the discharge gate 7a is opened. The left and right collecting chutes 4 and 5 can discharge the objects to be weighed independently.

<Problems to be Solved by the Present Invention> However, in the combination weighing device of FIG. 5, the collecting chutes are doubled to form independent outlets 1a and 2a, so that the chute structure is complicated. At the same time, there is a problem that a portion to be weighed accumulates at the intersection of the inner chutes 1 and 2.

In the combination weighing device shown in FIG. 6, the two collecting chutes 4 and 5 are separated, and the weighing hoppers 6 and 7 are also separated according to the collecting chutes 4 and 5, so that the number of combinations is small. Is extremely reduced, and the accuracy with respect to the target amount is significantly reduced.

For this reason, it is conceivable to increase the number of combinations by providing a weighing hopper having a double discharge gate capable of discharging the objects to be weighed to both of the collecting chutes 4 and 5 adjacent to the collecting chutes 4 and 5. Since the opening and closing directions of the discharge gates of the weighing hoppers and the discharge gates 6a and 7a of the other weighing hoppers 6 and 7 with respect to the edges of the collecting chutes 4 and 5 are different, a mechanism different from the opening and closing mechanism of the other weighing hoppers 6 and 7 is required. There is a problem that becomes.

In the above two examples, if the number of weighing hoppers is increased, the number of combinations increases, and accurate weighing can be performed. Since the number of scales obtained is limited, it is not possible to expect a highly efficient and accurate discharge operation with these conventional devices.

Therefore, as disclosed in JP-A-59-10815, two weighing hoppers connected integrally are supported by one weighing device so that many combinations can be obtained with a small number of weighing devices. It is conceivable to apply the technology to do so.

However, a pair of weighing hoppers formed by simply connecting the side surfaces of two weighing hoppers each having an inverted triangular bottom as described above has a large width, and a large number of hoppers cannot be arranged along the edge of the opening surface of the collecting chute. . Even if such a pair of weighing hoppers are disposed above the boundary between the two collecting chutes, the weighing object is moved from one weighing hopper located above one collecting chute to the other collecting chute side. Can not be discharged.

That is, the number of combinations viewed from one collecting chute due to arranging such a pair of connected weighing hoppers above the boundary between the opening surfaces of the two collecting chutes is increased only up to twice. Only the same effect as in the case where the double hopper shown in FIG. 5 is arranged at the boundary between the opening surfaces of the two collecting chutes can be obtained.

An object of the present invention is to provide a combination weighing device that solves the above problems.

<Means for Solving the Problems> In order to solve the above problems, in the combination weighing device of the present invention, a semicircular opening surface for receiving the object to be weighed from above, and the weighing object is received by the opening surface. First and second funnel-shaped collecting chutes each having a discharge port for discharging the object to be weighed and having the opening surfaces adjacent to each other so as to form a circle; and a partition erected in the center of the interior. The two storage chambers having upper and lower openings adjacent to each other with a plate interposed therebetween, and the lower edge of the partition plate is rotated toward and away from the lower edge of the partition plate, so that the lower surfaces of the storage chambers are independent of each other. And two discharge gates for opening and closing the first and second collecting chutes. The first and second collecting chutes are arranged annularly along the edges of the opening surfaces of the first and second collecting chutes. A combination weighing device having a plurality of weighing hoppers discharged to a collecting chute. Te, at least one weighing hopper of the plurality of weighing hoppers, metering one of the housing chamber of the hopper is located above the opening surface of the first collecting chutes, the second the other housing chamber
The first and second collecting chutes are disposed above a boundary between the opening surfaces of the first and second collecting chutes so as to be located above an opening surface of the collecting chute. Any of the collecting chutes can be tilted to the side, and the objects to be weighed discharged from the respective storage chambers of the weighing hopper above the boundary portion are received on the inclined surface, and the inside of the first and second collecting chutes is received. A rotating plate is provided for selectively carrying out the rotating plate.

<Operation> Due to such a configuration, in the combination weighing device of the present invention, not only all the storage rooms located above the opening surface of one collecting chute but also above the boundary between the opening surfaces of the two collecting chutes. Of the two storage chambers of the placed weighing hopper, the storage chamber located above the opening surface of the other collecting chute can also participate in the combination on the one collecting chute side. In addition, each weighing hopper has a structure in which the lower edge of the two discharge gates is rotated so as to contact and separate the lower edge of the two discharge gates with the lower edge of the partition plate separating the two storage chambers. Many can be placed along the edge of the surface.

<Embodiment of the Present Invention> (FIGS. 1 and 2) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic side view showing the appearance of a combination weighing apparatus to which the present invention is applied, with a part of a mechanism part omitted, and FIG.
Is a top view, and FIG. 3 is a perspective view showing a main part.

In the figure, reference numeral 10 denotes a base, the upper surface 10a of which is formed in a square shape, and an inverted conical chute receiving portion 11 which is inserted from the upper surface 10a to the bottom portion 10b.

The chute receiving portion 11 has a first semi-circular opening.
And the second collecting chutes 12, 13 are adjacent to each other so that the edges 12a, 13a are continuous to form a circle.

Outlets 12b, 1 of the first and second collecting chutes 12, 13
Below the 3b, there are provided timing hoppers 14, 15 which open and close in synchronization 12 with a packaging machine (not shown), respectively. Above the first and second collecting chutes 12, 13, a prismatic casing 20 is fixed by a plurality of columns (not shown) from the base 10.

In the lower part of the peripheral wall of the housing 20, a first weighing hopper group including seven weighing hoppers 21 arranged along an arc portion of the edge 12a of the opening surface of the first collecting chute 12, A second weighing hopper group composed of seven weighing hoppers 22 arranged along an arc portion of the edge 13a of the opening surface of the second collecting chute 13, and an opening of the first and second collecting chutes 12, 13; Weighing hoppers 23 placed one above each other at both ends of the surface boundary
And a third group of weighing hoppers, which are connected to 16 weighing devices 25 housed in the housing 20.

As shown in FIGS. 3 and 4, the weighing hoppers 21, 22, and 23 have partition plates 21e, 22e, and 23e,
Storage compartments divided into left and open at the top and bottom
21a, 21b, 22a, 22b, 23a, 23b and discharge gates 21c, 21 for independently discharging the objects to be weighed stored in each storage chamber.
d, 22c, 22d, 23c, and 23d.

These discharge gates are rotated so that the lower edge thereof is in contact with the lower part of the partition plate to close the lower surface of each storage chamber, and are rotated so as to be separated from the lower edge of the partition plate, and the lower surface of each storage chamber is rotated. open.

The discharge gates of the weighing hoppers 21 and 22 are
Alternatively, they are supported in such a direction that they open and close in the tangential direction of the edges 12a, 13a of the second collecting chutes 12, 13.

In addition, as shown in FIG. 4, the weighing hopper 23 disposed above the boundary between the opening surfaces of the first and second collecting chutes 12 and 13 has one storage chamber 23a in which the first collecting chutes 12 and 13 are disposed. And the other storage chamber 23b is arranged in a direction to be located above the opening surface of the second collecting chute. That is, the weighing hoppers 21, 22, and 23 are annularly arranged in the same direction with respect to the center of a circle formed by the opening surfaces of the two collecting chutes 12, 13.

Below the weighing hoppers 23, the objects to be weighed discharged from the respective storage chambers 23a and 23b of the weighing hoppers 23 are unloaded into the first collecting chute 12 while being inclined toward the first collection 12 side. 2, each storage chamber 23 of the weighing hopper 23 is inclined toward the collecting chute 13 side.
The objects to be weighed discharged from a and 23b are transferred to the second collecting chute 13
A rotating plate 50 to be carried out is mounted on the upper end of the boundary of the collecting chute.

Therefore, when the rotation plate 50 is inclined toward the first collecting chute 12 and the discharge gate 23d of the measuring hopper 23 is opened, the objects to be weighed in the storage chamber 23b are carried out into the first collecting chute 12, and Conversely, when the unloading gate 23c is opened while the rotating plate 50 is inclined toward the second collecting chute 13, the objects to be weighed in the storage chamber 23a are unloaded into the second collecting chute 13. become.

In the upper half of the housing 20, an intermediate hopper 26, as a supply device for supplying an object to be weighed to each of the weighing hoppers 21, 22, and 23,
A circular feeder 30 and a radiation feeder 31 are provided.

Each of the intermediate hoppers 26 is attached to and disposed on the upper part of the peripheral wall of the housing 20, corresponding to each of the weighing hoppers 21, 22, and 23.

In the intermediate hopper 26, the stored objects to be weighed are
Discharge gates 26a, 26b for selectively supplying the storage chambers 21a, 21b, 22a, 22b, 23a, 23b of 1, 22, and 23 are provided.

In addition, these intermediate hopper 26 and each weighing hopper 21,
Each of the discharge gates 22 and 23 is driven by an open / close drive device (not shown) housed in the housing 20.

A circular feeder 30 formed in a circular umbrella shape is provided at the center of the upper surface portion 20a of the housing 20, and a weighing object from the circular feeder 30 is radially arranged on a peripheral portion of the circular feeder 30. A radial feeder 31 for supplying the intermediate hopper 26 is provided. The supply of the objects to be weighed to the circular feeder 30 is performed from the transport conveyor 40.

<Operation of the above embodiment> Next, the operation of the combination weighing device of the above embodiment will be described.

The objects to be weighed supplied from the conveyor 40 to the circular feeders 30 are supplied to the respective intermediate hoppers 26 by the respective radiation feeders 31.

Each storage room 21a, 21b, 22a, 22 of the weighing hopper 21, 22, 23
When one or both of b, 23a and 23b are empty, the discharge gate of the intermediate hopper 26 on the empty storage chamber side is opened, and the object to be weighed is stored in this storage chamber.

When an object to be weighed is stored in any of the storage chambers 21a, 21b, 22a, 22b, 23a, and 23b, the weighing hoppers 21, 22, and 23 are stored based on the weighing values from the weighing device 25 corresponding to the weighing hoppers 21, 22, and 23. The weight value of the object to be weighed is calculated.

This calculation is performed, for example, in the two storage chambers 21a, 21a of the weighing hopper 21.
When the object to be weighed is stored in one of the storage chambers from the state where 1b is empty, it can be obtained by subtracting the empty weight value of the weighing hopper 21 from the weighed value of the weighing device 25.

When an object to be weighed is stored in one of the storage chambers, the sum of the empty weight value of the weighing hopper 21 and the weight value of the already stored weighing object is obtained from the weighing value of the weighing device 25. By subtracting (or the weighing value immediately before the weighing object is put into the empty storage chamber), the weight value of the newly stored weighing object can be obtained.

Here, at a certain timing, for example, the timing hopper 14
When a discharge request signal is input from a packaging machine (not shown) disposed below the weighing hopper 21, the weights of the objects to be weighed in the storage chambers 21a and 21b of the weighing hopper 21 and the A combination close to the target weight is selected based on the measured weight value of the weighed object.

Here, for example, when a combination including the objects to be weighed stored in the storage chamber of the weighing hopper 23 is selected, the objects to be weighed are passed through the rotating plate 50 inclined toward the first collecting chute 12. Is discharged into the first collecting chute 12 together with the objects to be weighed in the storage chambers of the other weighing hoppers 21 and the first collecting chute is discharged.
From 12 it is stored in the timing hopper 14 and discharged to the packaging machine.

Similarly, when the discharge request signal is input from the packaging machine side disposed below the timing hopper 15, when the combination including the objects to be weighed stored in the storage chamber of the weighing hopper 23 is selected. The second collecting chute, together with the objects to be weighed in the storage chambers of the other weighing hoppers 22, is rotated via the rotating plate 50 inclined toward the second collecting chute 13.
13 and is stored in the timing hopper 15 from the second collecting chute 13 and discharged to the packaging machine.

If there is a request for simultaneous discharge, for example, one combination of one weighing hopper 23 and each weighing hopper 21 is selected, and the combination of the other weighing hopper 23 and each weighing hopper 22 is selected as a set. The selected two sets of objects to be weighed are discharged to the first and second collecting chutes 12 and 13, respectively.

When two sets of weighing objects having different target weights are separately discharged from the first and second collecting chutes 12 and 13, respectively, the weighing objects in the two weighing hoppers 23 are set to the larger weighing target with the larger target weight. In order to keep the accuracy of the combination weight uniform by participating in the selection of combinations.

<Another embodiment of the present invention> In the above embodiment, the first and second collecting chutes 1
Although the timing hoppers 14 and 15 are provided below the two and 13, the objects to be weighed may be directly discharged from the collecting chutes 12 and 13.
The number of the weighing hoppers 23 provided as the third weighing hopper group at the boundary of 13 may be one.

<Effect of the present invention> As described above, in the combination weighing device of the present invention, the first and second collecting chutes each having a semicircular opening surface and having the opening surfaces adjacent to each other so as to form a circle. The weighing hoppers having the two storage chambers are arranged annularly along the edges of the respective opening surfaces, and at least one of the weighing hoppers is placed above the boundary between the opening surfaces of the first and second collecting chutes. The objects to be weighed, which are arranged and discharged from the respective storage chambers of the weighing hopper, can be carried out to any of the collecting chutes by a rotating plate which is attached to the upper part of the boundary so as to be tiltable.

Therefore, not only all storage chambers located above the opening face of one collecting chute but also the two collecting chambers of the weighing hopper arranged above the boundary portion, above the opening face of the other collecting chute. An object to be weighed in the located storage room can also participate in the combination on one collecting chute side.

That is, according to the present invention, by disposing one weighing hopper having two storage chambers at the boundary between two collecting chutes, the number of combinations viewed from one collecting chute is increased by four times. In addition, the shape of each weighing hopper is structured such that the lower part of the discharge gate is brought into contact with and separated from the lower edge of the partition plate to open and close the lower surface of each storage chamber. can do.

For this reason, the number of combinations is much larger than in the past, and both high emission efficiency and high combination accuracy with respect to the target amount can be achieved.

In addition, since all the weighing hoppers including the weighing hoppers at the boundary between the first and second chutes and the collecting chutes are the same, a common mechanism can be used and the structure is simplified.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing the appearance of one embodiment of the present invention,
FIG. 2 is a top view of one embodiment, and FIG. 3 is a perspective view showing a main part of one embodiment. FIG. 4 is a schematic diagram of a main part of one embodiment, and FIGS. 5 and 6 are schematic diagrams showing a configuration of a conventional apparatus. 12 first chute, 13 second chute, 21, 22, 23, weighing hopper, 25 weighing machine, 26
Intermediate hopper, 30 ... circular feeder, 31 ... radiant feeder.

Claims (1)

(57) [Claims] 1. A semicircular opening surface for receiving an object to be weighed from above and a discharge port for discharging the object to be weighed received at the opening surface, each of which has a circular shape. Funnel-shaped first and second collecting chutes having the opening surfaces adjacent to each other, two storage chambers having upper and lower openings adjacent to each other with a partition plate erected in the center of the inside thereof, and the partition plate And two discharge gates that rotate so that the lower edge part comes into contact with and separates from the lower edge part, and independently open and close the lower surface of each of the storage chambers. A combination weighing device comprising: a plurality of weighing hoppers arranged annularly along an edge of an opening surface of the chute to discharge objects to be weighed in each storage chamber to the first and second collecting chutes; At least one of the plurality of weighing hoppers includes the weighing hopper; One of the storage room is located above the opening surface of the first collecting chute, wherein the other housing chamber second
The first and second collecting chutes are disposed above a boundary between the opening surfaces of the first and second collecting chutes so as to be located above an opening surface of the collecting chute. Any of the collecting chutes can be tilted to the side, and the objects to be weighed discharged from the respective storage chambers of the weighing hopper above the boundary portion are received on the inclined surface, and the inside of the first and second collecting chutes is inclined. A combination weighing device, further comprising a rotating plate for selectively carrying out the weighing device.