JPH08327439A - Fixed-quantity filling apparatus - Google Patents

Abstract

PURPOSE: To provide an apparatus by which the fixed quantity of an object, to be metered, at a target weight is filled at high speed. CONSTITUTION: A main bucket 3 which stores an object, to be metered, which is fed from a first feed device 1 is installed. In addition, an auxiliary bucket 8 which stores an object, to be metered, which is fed from a second feed device 6 is installed. The weight of the object, to be metered, inside the main bucket 3 and the weight of the object, to be metered, inside the auxiliary bucket 8 are metered by a load cell 4 and a load cell 9. The main bucket 3 is charged with an object by aiming at a weight which is by a reduced weight of Wc =4σ (where σ represents the standard deviation of the object, to be metered, inside the main bucket 3) smaller than a target weight Wo , and an actual weight is metered as a main charged weight Wa . The auxiliary bucket 8 is charged with an object by aiming at an auxiliary filling weight Wh1 =3σ, and the weight of an actual object to be metered is metered as an auxiliary charged weight Ws1 . When their sum (Wa +Ws1 ) is smaller than the target weight Wo , the auxiliary bucket 8 is selected. When the sum (Wa +Ws1 ) is larger than the target weight Wo , the auxiliary bucket 8 is not selected. Then, the object, to be metered, up to a remaining target weight Wo is added so as to be charged a little from the first feed device 1, and a gate 10 is opened when a gate 5 and the auxiliary bucket 8 are selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quantitative filling device for quantitatively filling a predetermined weight of an object to be weighed into a box, a bag or the like. The present invention relates to a constant quantity filling device which is provided with a bucket and one or a plurality of auxiliary buckets for replenishing the bucket, and small addition means for additionally replenishing an object to be weighed to the total of the main bucket and the selected auxiliary bucket.

[0002]

2. Description of the Related Art Conventionally, in order to quantitatively fill a box, bag or the like with a predetermined weight of an object to be weighed, for example, an apparatus as shown in the schematic diagram of FIG. 6 has been used. The apparatus shown in the figure includes a supply device 41 and a supply device 4 for continuously supplying the objects to be weighed.
1. The bucket 43 for storing the objects to be weighed supplied from No. 1 and the weight of the objects to be weighed supplied to the bucket 43 is weighed by the load cell 44. The measurement of the object to be weighed by the load cell 44 is performed while charging the object to be weighed from the supply device 41, and the charging speed of the object to be measured from the supply device 41 is set by changing the opening degree of the gate 42 to, for example, two stages. Adjusted.

In this apparatus, the objects to be weighed are loaded as shown in FIG. The horizontal axis in FIG. 7 is time, and the vertical axis is the weight of the object to be weighed. First, as shown by points O to A in FIG. 7, until the weight of the object to be weighed in the bucket 43 reaches a predetermined weight, the opening of the gate 42 is increased and the loading speed is increased to perform loading. When the load is close to point A, the opening of the gate 42 is reduced and the loading speed is reduced to gradually load (small load), and the gate 42 is closed immediately before the target weight. Is stopped (point B in the figure). In this way, the method of changing the input speed at the beginning and end of the input,
A method in which the opening of the large gate is changed as described above to switch the large opening and the small opening in two stages, a method in which the opening of the gate 42 is continuously changed by a servo motor, and the amplitude intensity of the electromagnetic strength is fed using a feeder. There is a method to change by. By changing the charging speed in this way, it is possible to fill the objects to be weighed at high speed without exceeding the target weight.

[0004]

In the apparatus shown in FIG. 6, in order to further increase the filling speed, as shown at point C in FIG. 7, a large charging speed up to the vicinity of the target weight W _o ,
That is, it is conceivable to throw in a large amount and to throw in a small amount of the small amount of the object to be measured up to the point D with a small amount. However, the following problems occur when a large amount of charge is applied to the vicinity of the target weight W _o . That is, normally, when the object to be weighed is charged in a large amount, even if the charging is stopped at a predetermined weight, the actual weight of the object to be weighed varies as shown in FIG. This variation is represented as a normal distribution and is characterized by the standard deviation σ. In this device, the weight of the object to be weighed in should not exceed the target weight W _o .
This is because the objects to be weighed once put cannot be removed. Therefore, the target weight W _o
In order to put the objects to be weighed so as not to exceed the target weight, as shown in FIG. 8, it is necessary to aim for a weight value smaller than the target weight W _o . That is, the maximum value in the center of the normal distribution is the target weight W.
We have to aim for a weight value which is smaller than _o by eg 4σ. However, in this case, the minimum weight of the object to be weighed after the large input is the target weight W _o −8σ, that is, the point E at the left end of the distribution in FIG. Therefore, to set this to the target weight W _o ,
It is necessary to replenish the object to be weighed corresponding to 8σ at maximum with a small input. If such a small amount is required, the filling speed cannot be increased to a certain extent or more. In addition to the above, when the distribution of the objects to be weighed changes, it is necessary to stop the large charging with an unnecessarily small weight, so that the filling time becomes longer or the target weight W is increased by the large charging.
_In some cases, it may exceed _o .

The present invention has been made in view of the above-mentioned prior art, and an object of the present invention is to provide a quantitative filling device in which quantitative filling up to a target weight is speeded up.
Another object of the present invention is to provide a quantitative filling device capable of performing high-speed filling even when the weight distribution of the object to be weighed changes due to large input.

[0006]

The quantitative filling device of the present invention comprises a first feeding device for feeding an object to be weighed by continuous feeding at a predetermined feeding speed, and an object to be weighed fed from the first feeding device. The supply of the objects to be weighed from the first supply device is stopped with the aim of reducing the weight by a predetermined reduction weight W _c from the target weight W _o , and the weight of all the objects to be weighed stored is the main input weight W _o. a main bucket weighing as _a, and reservoir and a second feeder of n supplied by a continuous-on the objects to be weighed (n is an integer of 1 or more), the objects to be weighed supplied from the respective second feed device , Replenishment weight W _hi (i =
1, 2, ..., N), the supply of the objects to be weighed from each of the second supply devices is stopped, and the weights of the stored objects to be weighed are supplemented by weights W _si (i = 1, 2, … 、
n) auxiliary buckets to be weighed as n), the auxiliary input weight W _si is selected, and the total weight of all of the selected auxiliary input weights W _si and the main input weight W _a is the target weight W. _The auxiliary bucket is selected so as to be smaller than and maximum, and the sum of the main input weight W _a and the selected auxiliary input weight W _si is determined as the large input weight W _g , and the target weight W _o said calculating means for obtaining a difference between the full flow weight W _g as insufficient weight W _d, and a small-on means for adding to meter the objects to be weighed corresponding to the missing weight W _d, the full flow weight W _g and a Ejection means for ejecting the object to be weighed with the insufficient weight W _d .

Further, in the above construction, when the standard deviation of the weight of the objects to be put into the main bucket is σ, the reduced weight W _c ≧ 4σ, and the replenishment weights W are
Each _hi can be configured to be smaller than the above-mentioned weight reduction weight W _c .

Further, the replenishment weights W _hi are different from each other, and the total S of all the replenishment weights W _hi is S ≦ W.
It can be configured to be _c .

Further, the quantitative filling device of the present invention may be configured so that the standard deviation σ is calculated based on the values of a plurality of main input weights W _{a in} the quantitative filling performed so far. it can.

Further, in the quantitative filling device of the present invention, the small feeding means supplies an object to be weighed at a speed lower than the predetermined feeding speed of the first feeding device, and the additional feeding device measures the amount to be weighed. And an additional bucket that stops the supply from the additional supply device when the weight of the object to be weighed supplied from the additional supply device reaches the insufficient weight W _d. .

Further, in this structure, the additional supply device may also be used as the first supply device, and the additional bucket may be used as the main bucket, or the additional supply device may be It may be configured such that it is also used as one of the second supply devices and the additional bucket is also used as one of the auxiliary buckets.

[0012]

The quantitative filling device of the present invention is for quantitatively filling a container such as a box or a bag with a predetermined weight of an object to be weighed, and a main bucket into which a rough amount of the object to be weighed is charged, and a main bucket. And one or more auxiliary buckets for refilling. The main bucket stores the objects to be weighed that are continuously fed from the first supply device at a predetermined feeding speed. Then, the supply of the objects to be weighed from the first supply device is stopped at the time when it is expected that the weight will be smaller than the target weight W _o by a predetermined reduction weight W _c . The time when the supply of the objects to be weighed from the first supply device is stopped is determined by measuring the objects to be weighed continuously fed from the first supply device by a weighing means such as a load cell provided in the main bucket. Alternatively, the determination may be made by managing the charging time using a timer or the like. After stopping the supply of the objects to be weighed from the first supply device,
The weight of the object to be weighed actually fed from the first supply device is weighed and used as the main weight W _a .

Further, in the n (n is an integer of 1 or more) auxiliary buckets, the same number (n) of second supply devices as the objects to be weighed are continuously charged into the auxiliary buckets for storage. The supply of the objects to be weighed from the respective second supply devices is stopped at the time when it is expected that the predetermined replenishment weight W _hi (i = 1, 2, ..., N) is reached. When to stop the supply of the objects to be weighed from the second supply device is determined by measuring the objects to be weighed continuously fed from the second supply device by a weighing means such as a load cell provided in each auxiliary bucket. Alternatively, the judgment may be made by controlling the charging time using a timer or the like. After the supply of the objects to be weighed from the first supply device is stopped, the weight of each object to be weighed actually put in from the second supply device is weighed, and each auxiliary input weight W _si
(I = 1, 2, ..., N).

The calculating means selects an auxiliary bucket to be added to the main bucket based on each auxiliary input weight _Wsi .
This selection is performed so that the total weight of the auxiliary input weights W _si and the main input weights W _a in all the selected auxiliary buckets is smaller than the target weight W _o and is the maximum. Then, the calculation means determines the total weight as the large input weight W _g, and obtains the difference between the target weight W _o and the large input weight W _g as the insufficient weight W _d .

The object to be weighed corresponding to the insufficient weight W _d is weighed by the small throwing means and added to the object to be weighed with the large weight W _g . This addition of the object to be weighed is carried out in order to make up for the deficient weight W _d as described above. The deficient weight W _d is obtained by subtracting the main input weight W _a from the target weight W _o and further the auxiliary input weight W _si. Since it is the weight after subtracting, the time required to add an object to be weighed corresponding to this is very short. The objects to be weighed with the large input weight W _g and the insufficient weight W _d are discharged by the discharging means, and one time fixed amount filling is completed.

As described above, the main bucket has a target weight W _o.
The object to be weighed is aimed at a weight smaller than the weight to be weighed W _{c, and the} weight to be weighed W _c is W _c ≧ where the standard deviation of the weight of the substance to be weighed into the main bucket is σ.
If 4σ, the main input weight W _a is substantially the target weight W _o.
Never exceeds. Further, if each replenishment weight W _hi is made smaller than the reduction weight W _c, the main input weight W _a can be appropriately supplemented by using the auxiliary input weight W _si to be weighed, and the large input weight W _g can be the target weight. It can approach W _o . Further, the respective replenishment weights W _hi may be the same as or different from each other, and by appropriately selecting the auxiliary bucket, the large input weight W _g can be made closer to the target weight W _o .
Further, the respective replenishment weights W _hi are different from each other, and the total S of all the replenishment weights W _hi is set to S ≦ W _c , so that the shortage weight W _d is appropriately compensated and the auxiliary bucket is appropriately selected. As a result, the large input weight W _g can be brought closer to the target weight W _o .

Here, the standard deviation σ may be a value which is measured or assumed in advance, but it is based on _a plurality of main input weights W _a in the quantitative filling performed by the apparatus of the present invention up to the previous time. It can also be calculated. By thus obtaining the standard deviation σ, even when the weight distribution of the object to be weighed in the apparatus of the present invention changes, high-speed filling can be performed according to the change.

Further, the above-mentioned small throwing means can be constituted by an additional supply device and an additional bucket, and this additional bucket reaches the deficient weight W _d of the object to be weighed supplied from the additional supply device. Store while measuring up to.
In the case of this configuration, in order to accurately replenish the object to be weighed with the insufficient weight W _d , the object to be weighed by the additional supply device is slower than the feeding speed of the object to be weighed in the first supply device described above. Need to supply.

Furthermore, the additional supply device can be used also as the first supply device or any of the second supply devices, and the supply bucket can be used as the main bucket or any of the auxiliary buckets. According to this configuration, it is possible to configure the small dosing means without providing a special device.

[0020]

Embodiments of the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows a schematic structure of a quantitative filling device according to an embodiment of the present invention. The apparatus of this embodiment has a target weight W _o.
The first supply device 1 for quantitatively filling a container such as a box or bag with the object to be weighed and continuously supplying the object to be measured 1.
And a main bucket 3 for storing the objects to be weighed supplied from the first supply device 1. The weight of the object to be weighed supplied to the main bucket 3 is measured by the load cell 4. A gate 2 is provided in the first supply device 1, and the opening and closing of the gate 2 turns on and off the loading of the objects to be weighed.

Further, the apparatus of this embodiment has a single second supply device 6 for continuously feeding the objects to be weighed and a single reservoir for storing the objects to be weighed supplied from the second feeding device 6. An auxiliary bucket 8 is provided. The weight of the object to be weighed supplied to the auxiliary bucket 8 is measured by the load cell 9. The second supply device 6 is provided with a gate 7, and the gate 7 is opened and closed to turn on and off the object to be weighed. The main bucket 3 and the auxiliary bucket 8 are provided with a gate 5 and a gate 10, respectively, and the objects to be weighed stored in the main bucket 3 and the auxiliary bucket 8 are opened by opening the gate 5 and the gate 10, respectively.
1 is filled into the container 12.

In the quantitative filling device of this embodiment, quantitative filling is performed as follows. First, the loading of the objects to be weighed from the first supply device 1 to the main bucket 3 is started, and the loading of the objects to be weighed from the second supply device 6 to the auxiliary bucket 8 is also started. The charging of the objects to be weighed from the first supply device 1 here is a so-called large charging, and the charging speed is higher than the charging speed from the second supplying device 6. While the object to be weighed is being loaded, the load cell 4 weighs the object to be weighed in the main bucket 3, and the load cell 9 weighs the object to be weighed in the auxiliary bucket 8.

In this embodiment, the weight of the object to be weighed in the main bucket 3 is smaller than the target weight W _o by the weight W _c = 4σ. Here, σ is the standard deviation of the actual weight of the objects to be weighed put into the main bucket 3, and is obtained in advance before the filling. This charging is performed while weighing the object to be weighed in the main bucket 3. When the weight of the object to be weighed in the main bucket 3 reaches such a value, the gate 2 is closed to stop the input of the object to be weighed from the first supply device 1, and after the stabilization time of the weighing value, the main bucket 3 is stopped. The actual weight of the object to be weighed in 3 is measured as the main input weight W _a . The time when the gate 2 is closed is determined by subtracting the weight value (drop set value) of the object to be weighed that is still in the air when the gate 2 is closed. Further, the stop of the supply from the first supply device 1 may be performed when a predetermined time has elapsed while measuring the time with a timer.

On the other hand, the auxiliary bucket 8 has a replenishment weight W _h1 =
The objects to be weighed are loaded so as to be 3σ. When the weight of the object to be weighed in the auxiliary bucket 8 reaches such a value,
By closing the gate 7, the input of the object to be weighed from the second supply device 6 is stopped, and after the stabilization time of the measured value, the actual weight of the object to be weighed in the auxiliary bucket 8 is the auxiliary input weight W _s1.
Is measured as. It should be noted that the head set value is also taken into consideration when the loading of the objects to be weighed from the second supply device 6 is stopped. Further, the stopping of the supply from the second supply device 6 may also be performed when a predetermined time has elapsed while measuring the time with a timer.

Next, the main input weight W _a and the auxiliary input weight W _s1
Is input to an arithmetic means (not shown) configured by a microcomputer or the like. The calculation means determines whether or not the auxiliary bucket 8 should be selected, that is, whether or not the objects to be weighed in the auxiliary bucket 8 should be discharged together with the objects to be weighed in the main bucket 3. This selection is made based on whether or not the sum (W _a + W _s1 ) of the main input weight W _a and the auxiliary input weight W _s1 is larger than the target weight W _o . If the sum (W _a +
When W _s1 ) is smaller than the target weight W _o , the auxiliary bucket 8 is selected and the value (W _a + W _s1 ) is set as the large input weight W _g . The sum (W _a + W _s1 ) is the target weight W.
When it is larger than _o , the auxiliary bucket 8 is not selected, and the value of the main input weight W _a is set as the large input weight W _g .
Then, finally, the insufficient weight W _d = W _o −W _g is obtained.

Next, an object to be weighed corresponding to the deficient weight W _d is added by a small charge. In this embodiment, the additional supply device forming the small throwing means is also used as the first supplying device 1, and the additional bucket forming the small throwing means is also used as the main bucket 3. Small supply is from the first feeder 1 to the main bucket 3
It is performed while measuring the weight of the object to be weighed supplied to the load cell 4. Since the insufficient weight W _d is smaller than the main input weight W _a , the input speed here is set to be smaller than the above-described large input speed. The closing speed is adjusted by changing the opening of the gate 2.

FIG. 2 shows the required amount of the object to be weighed in a small amount when the auxiliary bucket 8 is selected and when it is not selected, together with the normal distribution of the object to be weighed in the main bucket 3. When the auxiliary bucket 8 is selected, that is,
When (W _a + W _s1 ) is smaller than the target weight W _o , small injection is performed along the thick line B in FIG. 2 and the maximum is 5σ (arrow C).
Items to be weighed are added. When the auxiliary bucket 8 is not selected, that is, when (W _a + W _s1 ) is larger than the target weight W _o , small charging is performed along the thick line A in FIG.
A maximum of 3σ (arrow D) is added. When the weight of the small-weighted object to be weighed reaches the insufficient weight W _d , the gate 2 is closed and the small-weight loading is stopped.

Finally, when the auxiliary bucket 8 is selected, the objects to be weighed in the main bucket 3 and the auxiliary bucket 8 are discharged by opening the gates 5 and 10, so that the auxiliary bucket 8 is also selected. If not, by discharging only the objects to be weighed in the main bucket 3,
One quantitative filling is completed.

In this embodiment, the standard deviation σ of the main input weight W _a measured in advance was used, but the standard deviation σ of the main input weight W _a measured in advance at the initial stage of the quantitative filling. It is also possible to adopt a configuration in which after a predetermined number of quantitative fillings, the quantitative filling is carried out using the standard deviation σ obtained from the main input weight W _a obtained at each quantitative filling. FIG. 5 shows an example of the configuration of a block circuit for performing quantitative filling while measuring the standard deviation σ.

As shown in the figure, the output from the load cell 4 for weighing the object to be weighed into the main bucket 3 is amplified by the amplifier 31 and further input to the A / D converter 33. The A / D converter 33 converts the input analog data into digital data, and the CPU (Central Processing Unit) 3
The processing at 0 is possible. RO in CPU30
Processing is performed according to a program stored in M (read-only memory) 34, and at that time, RAM (random access memory) 35 is temporarily used.

Data such as the target weight W _o and the initial standard deviation σ are input via the keyboard 36, and stored in the nonvolatile RAM.
35. The display 38 displays the weight of the object to be weighed, the set value in the nonvolatile RAM 35, and the like.
The input / output 37 is used to output the result of processing in the CPU 24.

In this embodiment, the main weight W _a of the object to be weighed, which is put into the main bucket 3, is taken into the CPU 30 each time it is weighed. The standard deviation σ is obtained by the following equation, where W _ai (i = 1, 2, 3 ... N) is the weight of each main charge obtained by charging n times.

[0034]

[Equation 1]

[0035] From this equation, W or individual values of _ai, or W sum of _ai and (W _ai) may can be seen that by storing the ^second sum value to RAM 35. This calculation is, for example, 100
It may be performed every filling. Further, it is also possible to adopt a configuration in which each time the filling is performed, the numerical value obtained in the filling a predetermined number of times (for example, 100 times) just before is used. By performing the quantitative filling based on the plurality of main input weights W _ai in the quantitative filling performed up to the previous time, high-speed filling can be performed even when the bulk density of the object to be weighed changes. .

FIG. 3 shows a schematic structure of a quantitative filling device according to another embodiment of the present invention. The quantitative filling device according to the present embodiment includes the second feeding device 16 in addition to the quantitative filling device shown in FIG.
And an auxiliary bucket 18 for storing the objects to be weighed supplied from the second supply device 16. The weight of the object to be weighed supplied to the auxiliary bucket 18 is measured by the load cell 19. In addition, the second supply device 16 has a gate 17
Is provided, and the gate 17 is opened and closed to turn on and off the object to be weighed. Further, the auxiliary bucket 18 is provided with a gate 20.

[0037] In quantitative filling apparatus of the present embodiment, auxiliary to the bucket 8 aimed at replenishing weight W _h1 = 2 [sigma] is introduction of objects to be weighed is performed, the auxiliary bucket 18 aimed at replenishing weight W _h1 = 4 [sigma] to be Weighing items are loaded. Auxiliary buckets 8 and 1
When the weight of the object in 8 reaches the above value,
By closing gate 7 and gate 17,
The loading of the objects to be weighed from the second supply devices 6 and 16 is stopped. Then, after the stabilization time of the measured value, the auxiliary bucket 8
The actual weight of the object to be weighed therein is weighed as an auxiliary input weight W _s1 , and the actual weight of the object to be weighed in the auxiliary bucket 18 is weighed as an auxiliary input weight W _s2 .

Next, the main input weight W _a and the auxiliary input weight W _s1
And W _s2 are input to a calculation means (not shown) configured by a microcomputer or the like. In the calculation means,
It is determined whether the auxiliary buckets 8 and 18 should be selected, and which auxiliary bucket should be selected. This selection is performed so that the total weight of the selected auxiliary input weight W _si and the main input weight W _a is smaller than the target weight W _o and is the maximum. That is, as shown in FIG.
_a is W _o to _W-o any auxiliary bucket when there between -2σ also not selected, the main-on weight W _a is W _o -2σ~W _o
If there between -4σ is selected auxiliary bucket 8, the main-on weight W _a is W _o -4σ~W _o If there between -6σ is selected auxiliary bucket 18, the main-on weight W _a is W _o
If it is between −6σ and W _o −8σ, both auxiliary buckets 8 and 18 are selected.

Next, an object to be weighed corresponding to the deficient weight W _d is added by small insertion. As shown in FIG. 4, when the main input weight W _a is between W _{o and} W _o −2σ, this small input is performed along the thick line E because no auxiliary bucket is selected. Further, the main input weight W _a is W _o −2σ
When it is in the range of W _o -4σ, the object to be weighed with the auxiliary input weight W _s1 = 2σ is replenished from the auxiliary bucket 8, so the thick line F
Is done along. Similarly, the main input weight W _a is W _o −4
When it is between σ and W _o −6σ, the auxiliary bucket 18 replenishes the object to be weighed with the auxiliary input weight W _s2 = 4σ,
It is performed along the thick line G. Furthermore, the main input weight W _a is W _o
When it is between −6σ and W _o −8σ, the measurement is carried out along the thick line H because (W _s1 + W _s2 ) = 6σ is replenished from both auxiliary buckets 8 and 18. The weight of the object to be added that is added by these small injections is 2σ at the maximum as shown by an arrow I. When the weight of the small-weighted object to be weighed reaches the insufficient weight W _d , the gate 2 is closed and the small-weight loading is stopped.

Finally, the gates of the main bucket 3 and the selected auxiliary bucket are opened to discharge the objects to be weighed, whereby one fixed amount filling is completed.

Also in this embodiment, the quantitative filling can be performed based on the plurality of main input weights W _ai in the quantitative filling performed up to the previous time.

In each of the above embodiments, the additional supply device is also used as the first supply device 1, and the additional bucket is used as the main bucket 3.
Although the case where they are also used has been described, they may be provided separately. Further, the additional supply device may be used also as any of the second supply devices, and the additional bucket may be used as any of the auxiliary buckets. Further, in the present embodiment, the opening and closing of the gate are changed to switch between the large injection and the small injection described above. However, a vibrating feeder is used in place of the gate, and the large injection and the small injection are changed by changing the amplitude. The configuration may be switched. In the embodiment of FIG. 3, the auxiliary buckets 8 and 18 have different capacities, but
You may comprise by the auxiliary bucket of the same capacity.

[0043]

As described above, in the quantitative filling device of the present invention, by providing one or a plurality of auxiliary buckets in addition to the main bucket, the variation of the objects to be weighed in can be substantially reduced. can do. As a result, it is possible to reduce the amount of small charge up to the target weight, and it is possible to speed up the quantitative filling. Further, since it is possible to reduce the variation in the weight of the object to be weighed in, it is possible to carry out the large-injection with a rougher accuracy than before.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a quantitative filling device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a necessary amount of the object to be weighed in the quantitative filling device of FIG. 1, and shows a necessary amount of the object to be weighed in a small amount when an auxiliary bucket is selected and when it is not selected. It is a figure which shows the difference in quantity.

FIG. 3 is a diagram showing a schematic configuration of a quantitative filling device according to another embodiment of the present invention.

FIG. 4 is a diagram showing a necessary amount of an object to be weighed in the quantitative filling device of FIG. 3, showing _a state in which an auxiliary bucket to be selected is different depending on a difference in the main input weight W _a .

FIG. 5 is a diagram showing a configuration example of a block circuit for performing quantitative filling while measuring a standard deviation σ.

FIG. 6 is a schematic configuration diagram showing an example of a conventional device for performing quantitative filling.

7 is a diagram showing the time dependence of the charging speed in the device of FIG.

FIG. 8 is a distribution diagram showing variations in the weight of the object to be weighed.

[Explanation of symbols]

 1 ... 1st supply apparatus 2, 5, 7, 9, 10, 10, 17, 20 ... Gate 3 ... Main bucket 4 ... Load cell 6,16 ... 2nd supply apparatus 8, 18 ... Auxiliary bucket 9 ... Load cell 11 ... Shoot

Claims (7)

[Claims] 1. A first supply device for continuously feeding an object to be weighed at a predetermined feeding speed, and an object to be weighed supplied from the first feeding device is stored, and a predetermined weight to be subtracted from a target weight W _o. The supply of the objects to be weighed from the first supply device is stopped aiming at a weight smaller by W _{c, and the} weight of all the objects to be weighed stored is the main input weight W _a.
A main bucket that weighs as, an n-th (n is an integer of 1 or more) second supply device for continuously feeding the objects to be weighed, and the objects to be weighed supplied from each of the second feeding devices are stored,
The supply of the objects to be weighed from each of the second supply devices is stopped aiming at the replenishment weight W _hi (i = 1, 2, ..., N), respectively, and the weight of the stored objects to be weighed is supplemented by the auxiliary weight W. n auxiliary buckets weighed as _si (i = 1, 2, ..., N), the auxiliary input weight W _si is selected, and all of the selected auxiliary input weights W _si and the main input weight W _a The auxiliary bucket is selected so that the total weight of the main input weight W _a and the target auxiliary weight W _o is smaller than the target weight W _o, and the total of the main input weight W _a and the selected auxiliary input weight W _si is the large input weight W _o. together determined as _g, dribble be added by metering and calculating means for calculating a difference between said target weight W _o and said full flow weight W _g as insufficient weight W _d, the objects to be weighed corresponding to the missing weight W _d Means and the object to be weighed added from the small input means Quantitative filling apparatus characterized by amount and a discharge means for discharging the objects to be weighed of the missing weight W _d is reached, the said from small dosing means full flow weight W _g and the lack weight W _d. 2. When the standard deviation of the weight of the objects to be put into the main bucket is σ, the reduced weight W _c ≧ 4
2. The quantitative filling device according to claim 1, wherein the filling weight W _hi is smaller than the reduction weight W _c . 3. a different value each replenishment weight W _hi one another, the sum S of all the replenishing weight W _hi quantitatively filling of claim 2 or 1, wherein the a S ≦ W _c apparatus. 4. The quantitative determination according to claim 2, wherein the standard deviation σ is calculated based on _a plurality of values of the main input weights W _{a in} the quantitative filling performed up to the previous time. Filling device. 5. The additional feeding device for feeding the object to be weighed at a speed lower than the predetermined feeding speed of the first feeding device, and the additional feeding device for feeding the object to be weighed from the additional feeding device. 5. The quantitative filling according to claim 1, further comprising: an additional bucket that stops the supply from the additional supply device when the weight of the object to be weighed supplied from the auxiliary supply unit reaches the insufficient weight W _d. apparatus. 6. The quantitative filling device according to claim 5, wherein the additional supply device is also used as the first supply device, and the additional bucket is also used as the main bucket. 7. The quantitative filling device according to claim 5, wherein the additional supply device is also used as any one of the second supply devices, and the additional bucket is also used as any one of the auxiliary buckets.