KR100825868B1 - Combined weighing apparatus - Google Patents

Abstract

It provides a combination weighing technique that can increase the accuracy of the combined weighing or counting of the weighed objects. In the selection step, since one large input meter is necessarily selected, the target weight value is substantially reduced. Therefore, even division by two small feeding meters is made with respect to the reduced target weight. As a result, the precision of the combined weighing of cornflakes or the combining coefficient of pills can be improved.

Description

Combination Weighing Technology {COMBINED WEIGHING APPARATUS}

The present invention relates to a combinatorial weighing technique, specifically a combinatorial weighing technique in which a combination of meters is selected so that the weight of the total of the weighed articles supplied to the plurality of weighing units becomes an optimal weight, and the weighed articles in these meters are collected.

For example, seasoned powdered foods (measurements) mixed with dried foods such as seaweed, sesame seeds, dried fish meat and dried vegetables are sold in small bags made of plastic.

Conventionally, as a measuring apparatus for seasoned powdered foods arranged in a bagging system of seasoned powdered foods, as in Patent Document 1, for example, a combination weighing apparatus capable of measuring accurate seasoned powdered foods at high speed is known. This is to select a combination of meters so that the sum of the weights of the seasoned powdered foods supplied to the plurality of weighing machines becomes an optimum weight, and aggregates the weighed items in these weighing machines.

For example, when 30 g (target weight value) of seasoned powdered food is to be put in a bag, ten equal-weight metering machines each having 10 g of one third of the target weight value are uniformly charged are prepared. Next, 10 g of seasoned powdered food is cut out in each equal-weight metering device using a cutting-out apparatus. Then, the weight of the seasoned powdered food in each meter is weighed, the combination of the meter closest to 100 g is selected, and collected by dropping as much as the weighed item in these meters. Thereafter, the collected seasoned powdered food is put in a small bag, and the small bag is sealed.

Patent Document 1: Japanese Patent Application Laid-Open No. 5-79889

However, the combination weighing apparatus of patent document 1 had the following faults.

That is, (1) For example, when putting 30 g of seasoned powdered food into a bag, ten equal-weight measuring instruments for storing 10 g obtained by dividing the target weight value by three are used. In these, 10 g of seasoned powdered food is cut out by the cutting device. However, an error (input error) occurs in each input amount. For example, if the feeding error of each cutting device is ± 10%, the deviation of seasoned powdered food is 9-11g, and a maximum of 2g (20%) occurs. Thereby, the precision of the filling amount of the seasoned powdered food at the time of putting a seasoned powdered food in the bag was falling.

An object of the present invention is to provide a combination weighing method and an apparatus capable of increasing the accuracy of the combined weighing of a weighed object.

An object of the present invention is to provide a combination counting method and an apparatus capable of increasing the accuracy of a combination coefficient of a measured object.

The invention described in claim 1 is for one or more large inputs into which an object to be measured is fed in which the maximum input weight including the deviation of the input weight of the object to be weighed becomes smaller than the target weight value of the combined weighing ( (大 중량 入 用) Weighing is less than the weighing device and the weighing material put into the large input weighing unit, and the weight value obtained by subtracting the weight of one or more weighing weighing units of the large weighing meter from the target weight value of the combined weighing By using a supplying step for supplying the weighed articles to each of a plurality of small-feed metering units into which the smaller weighed articles are respectively introduced, the large-load meter and the small-feed meter, The weighing process for weighing the weighed objects put into each device, and the weight of the sum of the weighed materials respectively supplied to the plurality of small-feed meters and the one or more large-feed meters, is the closest to the target weight value. A combination weighing method comprising a selection step of selecting a combination of weighing units that are suitable weights, and an aggregation step of collecting each weighed object in the selected weighing unit.

According to the invention as set forth in claim 1, after the measurement of the weighed object by the large-feed meter and the small-feed meter, a combination of a meter whose weight of the sum of the weighed items supplied to each meter becomes an optimum weight is selected.

At this time, one or more large input meter is necessarily selected. This means that the target weight value is reduced by subtracting a large amount of the weighed object from the target weight value in advance. The smaller the target weight value is, the less the amount of the weighed object that is, for example, evenly divided using a plurality of small feeding meters. In addition, if the weighing accuracy of the meter is the same, the variation in the input weight of the weighed object is also smaller than when the target weight value is equally divided as in the prior art. As a result, the precision of the combined weighing of the measured object can be improved.

As the measurement object, for example, a pill, capsule or the like of a medicine can be employed. Others include laver, dried fish meat, dried vegetables, grains, tea leaves, powdered products, pasta, screws and nuts, seeds such as coffee beans and sesame seeds, seasoned powdered foods and the like.

The target weight value of the combined weighing is a weight that is a target of the weighed object to be combined weighed.

The maximum input weight including the deviation of the input weight of the weighed product is the difference between the input target weight value (a) of the weighed material and the input weight of the weighed material (± b) based on the error of input of the weighed object by the meter. It is the sum (a + (+ b)) with the maximum deviation weight value (+ b).

The structure of the large input meter and the small input meter is not limited. For example, what has a metering hopper and the load cell which measures the to-be-measured object in a metering hopper can be employ | adopted. In this case, the big difference in the structure between the large input meter and the small input meter is the size of the weighing hopper.

One unit may be used and two or three units may be used. In addition, the number of uses of the small injection | throwing-in meter is two or three or more.

The method of supplying the measured object to the large input meter and the small input meter is not limited. For example, a pipe feeder or a vibrating feeder may be provided between the storage hopper of the weighed object and each meter to supply the weighed material, respectively.

The weight of the weighed object supplied to the small-feed meter is lighter than the weighed object fed to the large-feed meter, and the target weight value is obtained by subtracting the weight of one or more weighed articles of the large-feed meter. It is the weight that becomes smaller.

The weight of the large input meter to be subtracted from the target weight value is changed depending on the number of the large input meter selected in the selection process. Specifically, one may be sufficient and two or three or more may be sufficient. In the case of two or more units, the total weight of the weighed objects of each large input meter should not exceed the target weight value of the combined weighing including the maximum weight including the deviation of the weight of these weighed objects.

In the selection step, one large input meter or two large input meters and a plurality of small input meters are selected. The combination of the meters is selected such that the sum of the weighed objects supplied to them becomes the optimum weight.

As a method of collecting each of the weighed objects in the selected meter, for example, an assembly by own weight drop using a chute, an automatic assembly using a conveyor, a manual assembly by hand, and the like can be adopted.

In the invention according to claim 2, the weight to be weighed is a solid whose weight is quantified, and the maximum input weight including the deviation of the input weight of the weighed object is smaller than the target weight value equivalent to the target number value of the combination coefficient. One or more large input weighing meters into which the quantity to be metered is introduced and one or more weights weighing less than the measured weighing material fed into the large feeding weighing meter and at the target weight value Supply process for supplying the weighed objects to a plurality of small-feeding meters into which the weighed items which are weighed less than the weight of the large amount of the weighed objects are respectively input, and each large-feed meter and small-feed meter Of the weighing process for measuring the weighed objects put into each device, and the sum of the weighed products respectively supplied to a plurality of small-feed meter and at least one large-feed meter. A combination coefficient comprising a selection step of selecting a combination of the weighing instruments that is the optimum weight closest to the target weight value, and an aggregation step of collecting each of the weighed items in the selected weighing machine and setting the number of weighed objects as a target number. It is a way.

According to the invention as set forth in claim 2, after the measurement of the weighed object by the large-feed meter and the small-feed meter, a combination of a meter whose weight of the total of the weighed item supplied to each meter becomes an optimal weight is selected.

At this time, a large amount of the weighed object measured by the large feeding meter is necessarily selected as part of the combined weighing. This means that the target weight value is reduced by subtracting a large amount of the weighed object from the target weight value in advance. When the target weight value becomes small, the amount of the weighed object that is equally divided using, for example, a plurality of small-feed meters is reduced by that much. In addition, if the weighing accuracy of the meter is the same, the variation in the input weight of the weighed object is also smaller than when the target weight value is equally divided as in the prior art. As a result, the precision of the combination coefficient of the measured object can be improved.

As a solid weighed product for which the weight is quantified, for example, a pill, a capsule, a screw, a nut or the like of a medicine can be employed.

The quantity of the measured object which the maximum input weight including the deviation of the input weight of the measured object becomes small compared with the target weight value which is equivalent to the target number value of the combination coefficient will be specifically described. For example, when the weight of the measured object is 1 g and the target number value is 10, the target weight value corresponding to the target number value of the combination coefficient is 10 g. If the deviation of the input weight of the measured object is, for example, ± 10% and the input weight of the large input meter is 7 g, the maximum input weight including the deviation of the input weight of the measured object is 7.7 g.

In addition, the specific weight of the weighed object put into each small input weighing unit is lighter than the weight of 7g weighed into the large input weighing unit, and the target weight value 10g is subtracted from the weight of the weighed object put into the large feeding meter 7g. Lighter than 3 g, for example 1 g.

In the invention according to claim 3, the number of measured objects to be put into each of the large-input meter and the small-input meter indicates that the input error in the corresponding large-input meter or the small-input meter is measured by the following equation. When the number conversion by water is shown, it is the combination coefficient method of Claim 2 which made the number of the said maximum input error into less than one. y = 1 / x. y is the number of measured objects whose maximum value of the input error of the measured object by the percentage in the said large input meter and the small input meter is one by conversion of the number of measured objects, x is said large input It is the input error of the measured object by the percentage in the meter for small input and the small input meter.

According to the invention as set forth in claim 3, when the measured object is introduced into the large-feed meter and the small-feed meter, the maximum value of the input error is less than one when the input error of each meter is expressed in number conversion. Only the number of objects to be measured is added. Thereby, in each meter, the error by a measurement does not generate | occur | produce with respect to the number of to-be-measured objects computed from the weight of the to-be-measured object. Therefore, it is possible to accurately count the measured object.

The number of measured objects whose maximum value y of the input error of the measured object by the percentage in the large input meter and the small input meter is one by conversion of the number of measured objects is, for example, the input of the corresponding meter. If the error x is ± 1%, y is 100.

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Effect of the Invention

According to the invention described in claim 1, in the selection step, at least one large input meter is necessarily selected, so that the target weight value is substantially reduced. Therefore, for example, even division by a plurality of small feeding meters is made with respect to the reduced target weight. As a result, the precision of the combined weighing of the measured object can be improved.

Further, according to the invention of claim 2, in the selection step, the large input meter is necessarily selected, so that the target weight value is substantially reduced, and the plurality of small input meters are used for the reduced target weight. For example, equal division is performed. As a result, the precision of the combination coefficient of the measured object can be improved.

Particularly, according to the invention described in claim 3, when the measured object is introduced into the large-feed meter and the small-feed meter, the maximum value of the input error is less than one when the input error of each meter is expressed in number conversions. Only the number of objects to be measured is added. As a result, in each meter, there is no error by weighing with respect to the number of to-be-measured objects calculated from the weight of the to-be-measured object. Therefore, accurate counting of the measured object can be performed.

1 is a side view of a combination meter according to a first embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of the front portion of the combination meter according to the first embodiment of the present invention.

3 is a front view in a state where the front plate and the assembly chute of the combined weighing apparatus according to the first embodiment of the present invention are removed.

4 is an enlarged cross-sectional view showing a main portion of the periphery of the pipe feeder of the combined weighing apparatus according to the first embodiment of the present invention.

5 is a block diagram showing a control circuit of the combined weighing apparatus according to the first embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

10: combination metering device 10A: combination counter

16: meter 16A: large input meter

16B: Small Feeding Meter

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, for convenience of description, the X1 direction in the figure is the front direction of the combined weighing device, the X2 direction is the rear direction of the device, the Y1 direction is the right direction of the device, the Y2 direction is the left direction of the device, the Z1 direction is the upper direction of the device and Make Z2 direction downward of the device. Here, the combination weighing technique at the time of putting 100 g of cornflakes in a bag is shown as an example.

Example 1

In the figure, reference numeral 10 denotes a combination weighing apparatus according to a first embodiment of the present invention. The combination weighing apparatus 10 is provided on an outer casing 11 and an outer casing 11 and has a predetermined amount of corn flakes. Of the upper hopper 12 in which the measured object is stored, the cutout portion 13 installed at the outlet of the upper hopper 12 and cutting out the corn flakes in a predetermined amount per unit time, and the outlet of the upper hopper 12. A lower hopper 14 disposed underneath and receiving corn flakes discharged by the cutout 13, a total of five pipe feeders 15 approximately horizontally arranged at the lower end of the lower hopper 14, and each pipe feeder ( Two large-input meters 16A and three small-input meters 16B, which are respectively disposed under the outlets of 15) and receive and measure the corn flakes discharged from each pipe feeder 15, and each of the meters 16A. , The weight of the sum of the cornflakes supplied to 16B) is the target weight of the combined weighing. A control unit 17 having a selection circuit 17a (Fig. 5) for selecting a combination of the meters 16A and 16B to be the closest optimum weight, and an assembly chute 18 for collecting the corn flakes in the selected meters 16A and 16B. ).

Hereinafter, these structures are demonstrated in detail.

The outer casing 11 is a rectangular box in a long plane in the X1-X2 direction, and a lower box 19 in which the control unit 17 is housed is formed. The upper hopper 12 is fixed to the upper end part on the X2 side of the outer casing 11. The upper hopper 12 is a metal hopper long in the Y1-Y2 direction, and the upper optical sensor 20 which detects the full state of corn flakes is provided in the upper part of the side plate of the upper hopper 12. As shown in FIG.

The cutout portion 13 is radially disposed on an outer circumferential surface of the rotating shaft 21 and the rotating shaft 21 intersecting the inner space of the outlet of the upper hopper 12, and three stirring blades for stirring the corn flakes 11 ( 22) and the cutting-out motor 23 fixed to the lower end of the back plate of the upper hopper 12 through the bracket. The rotating shaft 21 protrudes outward from one side plate of the upper hopper 12, and the pulley 24 is fixed to this protrusion part. The pulley 25 is also fixed to the output shaft of the cutting motor 23. A belt 26 is interposed between the two pulleys 24 and 25, and by rotating the pulleys 24 and 25 by the cutting motor 23, the stirring blade 22 rotates to form the corn flakes in the upper hopper 12 ( 11) is cut out at 500g per minute. The stirring blade 22 may be omitted depending on the raw material.

The lower hopper 14 is a small hopper extending in the Yl-Y2 direction with a smaller volume than the upper hopper 12, and the lower end of the lower hopper 14 is the X2 side of the fixed base plate 27 that is longer in the Yl-Y2 direction. It is fixed on the end of. At the lower end of the upper hopper 12, an upper end of a small drop chute 28 for dropping the cut corn flakes into the lower hopper 14 is fixed. In the upper part of the side plate of the lower hopper 14, the lower optical sensor 29 which detects that a corn flake is full is provided.

On the upper plate of the lower box 19, struts 30 are placed on both ends in the X1-X2 direction and on both ends in the Y1-Y2 direction. Between the upper ends of both struts 30, a connecting shaft 31 whose axial direction is oriented in the Y1-Y2 direction is spanned horizontally. At both ends of the coupling shaft 31, a pair of bearings 32, which are formed to protrude from both corner portions on the X1 side of the lower surface of the fixed base plate 27, are externally inserted. In addition, the inclination angle of the fixed base plate 27 is attached to the upper plate of the lower box 19 near the middle part in the X1-X2 direction and in the middle part in the Y1-Y2 direction on the X2 side than both pillars 30. One inclination-angle adjustment structure 33 to adjust is provided upright.

The inclination angle adjustment structure 33 is formed by the mounting plate 34 having a long thickness in the Yl-Y2 direction fixed to the upper surface side of the upper plate, and a bolt hole formed in the middle of the longitudinal direction of the mounting plate 34. Inclination angle adjustment column 36 having a large diameter height adjustment bolt 35 installed to protrude in the direction (Z1 direction) and an inner thread where the height adjustment bolt 35 is screwed from the bottom surface to the upper end portion. Have The upper end of the inclination angle adjustment column 36 is formed with a pin hole extending in the Yl-Y2 direction.

Moreover, a pair of brackets 37 are arrange | positioned apart on the lower surface side of the intermediate part of the longitudinal direction of Y1-Y2 rather than the middle part of the X1-X2 side of the fixed base board 27. As shown in FIG. Both brackets 37 are provided with elongated holes 37a having lower shapes. The upper end of the inclination angle adjustment column 36 is disposed between both brackets 37, and the pin 38 having a short length is inserted in series into the pin holes of the both long holes 37a and the inclination angle adjustment column 36. As a result, the tilt angle adjustment column 36 and the fixed base plate 27 are axially supported.

When the height adjustment bolt 35 is rotated to the low adjustment side, the screwing of the inclination angle adjustment column 36 to the height adjustment bolt 35 proceeds gradually, and the inclination angle adjustment column 36 descends gradually. As a result, the end portion on the X2 side of the fixed base plate 27 is rotated downward in the vertical plane centering on the short pin 38, and as a result, the tip end portion (downstream portion) of each pipe feeder 15 is obtained. ) Is inclined upward in the vertical plane. On the other hand, when the height adjustment bolt 35 is rotated to the high adjustment side, the screwing release of the inclination angle adjustment column 36 to the height adjustment bolt 35 proceeds gradually, and the inclination angle adjustment column 36 gradually rises. As a result, the end of the fixed base plate 27 on the X2 side rotates upward in the vertical plane about the short pin 38, and the tip end of each pipe feeder 15 moves downward in the vertical plane. Incline When the measured object to be combined-measured is corn flakes, the inclination angle of each pipe feeder 15 is 1 to 10 degrees, preferably 2 to 5 degrees, with respect to the horizontal line. However, this inclination angle is changed suitably according to the material and the characteristic of a to-be-measured object.

On the fixed base plate 27, a total of five pipe feeders 15 in which each axis direction is aligned in the Y1-Y2 direction are arranged at a constant pitch toward the Y1-Y2 direction. Each pipe feeder 15 is housed in the inner space of the door-shaped casing 39 which is provided on both ends of the fixed base plate 27 in the Y1-Y2 direction. Both side plates of the door-shaped casing 39 are fixed to the upper hopper 12 through the protrusion pieces 39a, respectively.

Each pipe feeder 15 has an outer cylinder 40, an inner cylinder 41 which is longer than the outer cylinder 40 and is inserted in and out of the outer cylinder 40, and the outer cylinder 40 as a circumference. The rotating mechanism 42 which rotates to a direction is provided. Of the five pipe feeders 15, two are large diameter feeders 15A having a diameter of 100 mm, and three are small diameter feeders 15B having a diameter of 50 mm. The two large diameter feeders 15A are identical in shape, dimension and rotation mechanism 42. Moreover, compared with the large diameter feeder 15A, the small diameter feeder 15B has only the small diameter of the outer side cylinder 40 and the inner side cylinder 41, respectively, and the rotating mechanism 42 etc. are the same. Therefore, only one large diameter feeder 15A is described here, and description of the other large diameter feeder 15A and the small diameter feeder 15B is abbreviate | omitted.

As shown in FIG. 1, FIG. 2, and FIG. 4, the both ends of the outer side cylinder 40 are attached to the fixed base board 27 so that rotation in the circumferential direction is possible through a pair of bearing 43, have. The circumferential rotation motor 45 is fixed to the upper space in the door-shaped casing 39 through a thick partition plate 44 whose upper end is fixed to the inner surface side of the top plate of the door-shaped casing 39. A large diameter gear 46 is secured to the leading end of the substantially horizontal output shaft of the circumferential rotation motor 45. The annular outer gear 47 meshed with the gear 46 is firmly fitted from the outside to the outer peripheral surface side of the intermediate portion in the longitudinal direction of the outer cylinder 40. Inside the outer cylinder 40, an inner cylinder 41 having an outer diameter of a diameter slightly smaller than the inner diameter of the outer cylinder 40 and having a length of about 1.5 times the outer cylinder 40 is inserted and detached. It is inserted and mounted.

When the outer cylinder 40 is rotated (circumferentially rotated) by the circumferential rotation motor 45 through the gear 46 and the outer gear 47, the inner cylinder 41 is integrated with the rotation of the outer cylinder 40. Rotate the enemy. An impeller 48 is screwed into the lower side hopper (side hopper 14 side) of the outer side cylinder 40 and inserted into the lower hopper 14 to break up the corn flakes formed into a mass by its own weight or the like. It is. The impeller 48 is a thick ring made of plastic. A part of the end surface on the X2 side of the impeller 48 is provided to protrude obliquely the stirring rod 49 of the corn flakes. When the outer side cylinder 40 rotates in the circumferential direction, the stirring rod 49 of the impeller 48 also rotates, is put into the lower hopper 14, and the lower part of the flake shaped corn flakes is shaved off.

In the position just below the impeller 48 of the fixed base plate 27, a small residue container 50 for accommodating the powder of corn flakes leaking out from the gap between the end portion on the X1 side of the impeller 48 and the outer cylinder 40 is provided. Is arranged. In addition, at the position just below the small waste container 50 of the lower box 19, a large waste container 51 for accommodating the corn flakes falling from the lower hopper 14 is disposed.

Next, with reference to FIG. 1 and FIG. 3, the structure of the said large input meter 16A and the small input meter 16B is demonstrated in detail.

The amount by which the maximum input weight (90.9 g) including the variation (± 1%) of the cornflake flakes is smaller than the target weight value (100 g) of the combined weighing in the two large input weighing units 16A ( 90 g) of corn flakes are added. In addition, the three small feeding meters 16B are lighter than the weight (90 g) of the corn flakes put into the large feeding meter 16A, and the large input weighing unit is set at the target weight value (100 g) of the combined weighing unit. Corn flakes having a smaller weight (5 g) than the value (10 g) obtained by subtracting the weight (90 g) of one portion of the corn flakes of (16A) are introduced. The metering hopper 55 of the small feeding meter 16B has only a small volume compared to the weighing hopper 55 of the large feeding meter 16A. The variation in the input weight of the corn flakes of the small feeding meter 16B is also ± 1%. Therefore, only the large input meter 16A is described here, and the description of the small input meter 16B is omitted.

As shown in FIG. 1, on the edge part of the upper plate of the lower box 19 on the X1 side, the load cell 53 is fixed via the small die 52. As shown in FIG. The lower part of the metering hopper 55 is fixed to the detector of the load cell 53 via the bracket 54. In the upper part of the formation part of the discharge port of the metering hopper 55, the vicinity of the upper end part of the opening-closing cover 56 is axially supported. In addition, the rotary solenoid 57 is fixed to the substantially middle portion of the front plate of the outer casing 11 in the Z1-Z2 direction. By rotating the rod 67a of the rotary solenoid 57 to the cover opening side, the part projecting upward from the metering hopper 55 of the opening / closing cover 56 is pressed, and the opening / closing cover 56 is rotated in the vertical plane. Open this cover. Thereby, the corn flakes discharged from the metering hopper 55 are external from the discharge part 18a of the lower end of the assembly chute 18 through the large collection chute 18 which has an inverted isosceles triangle shape as viewed from the front. Discharged. The aggregate chute 18 may be divided into two units dedicated to the large input meter 16A and one dedicated to the small input meter 16B. In that case, the aggregation chute for large injection | pouring meter 16A and the aggregation chute for small injection | pouring meter 16B may be provided together, or you may oppose.

The large feeding meter 16A is mainly composed of these load cells 53, the metering hopper 55, the rotary solenoid 57, and the opening / closing cover 56.

The aggregation chute 18 is provided so that the inclination angle can be adjusted through the inclination angle adjustment protrusion 58 which protrudes in the front plate of the lower box 19. As shown in FIG. The inclination-angle adjustment protrusion 58 is able to adjust the protruding length from the front plate by the bolt nut structure which has a double nut. By adjusting the protruding length of the inclination angle adjustment protrusion 58, the inclination angle of the assembly chute 18 can be appropriately adjusted according to the viscosity, shape, and the like of the measured object.

The discharge part 18a of the assembly chute 18 is a narrow passage. At the discharge port at the lower end of the discharge portion 18a, a rotary cover 59 for rotating in the vertical plane is axially supported. The rotation lid 59 is opened by the rotational movement in the lid opening direction of the rod 60a of the rotary solenoid 60 fixed to the upper edge of the side plate of the discharge portion 18a via the bracket. In the discharge port, a bag (not shown) is placed, which puts the corn flakes of the optimum weight closest to the target weight value of the combined weighing 100 g.

Next, with reference to the block diagram of FIG. 5, the main control circuit of the combination metering apparatus 10 is demonstrated.

As shown in FIG. 5, the upper optical sensor 20, the lower optical sensor 29, and the load cell 53 are electrically connected to the input port of the control part 17, respectively. The output port of the control unit 17 is electrically connected to a cutting motor 23, a circumferential rotation motor 45, two rotary solenoids 57 and 60, and a selection circuit 17a, respectively.

When the control unit 17 receives the detection signal from the upper optical sensor 20, a command is sent from the control unit 17 to the raw material conveyor to stop the supply of the corn flakes to the upper hopper 12. In addition, when the control unit 17 receives the detection signal from the lower optical sensor 29, the cutting stop command is sent from the control unit 17 to the cutting motor 23. Further, based on the weighing signal from each load cell 53, when the controller 17 recognizes that the corn flakes having a predetermined weight are put into the corresponding weighing hopper 55, the corresponding peripheral rotation from the controller 17 is performed. The command to stop the rotation is issued to the motor 45. As a result, the feeding of the corn flakes to the respective weighing hoppers 55 from the corresponding large diameter feeder 15A or small diameter feeder 15B is stopped. At the same time, based on the weighing result by each load cell 53, the selection circuit 17a causes the meter 16 to be the optimum weight (e.g. 99.99g) that is closest to the target weight value of the combined weighing 100g. Select. Then, the rotary solenoid 57 corresponding to each selected weighing hopper 55 is operated to the lid opening side, the corresponding opening and closing lid 56 is opened, and the corn flakes in each selected weighing hopper 55 are collected into the chute 18. Drop on each. The dropped 99.99 g of corn flakes are collected in the discharge portion 18a of the collection chute 18. Thereafter, the rotary solenoid 60 is operated to the lid opening side, and corn flakes are put into a bag (not shown) disposed directly under the discharge port.

Next, with reference to FIGS. 1-5, the combined weighing method of the corn flakes by the combined weighing apparatus 10 which concerns on Example 1 of this invention is demonstrated.

As shown in FIGS. 1-5, corn flakes are supplied to the upper hopper 12 by the raw material conveyor which is not shown in figure. At that time, when the control unit 17 receives the detection signal from the upper optical sensor 20, the control unit 17 sends a command to the raw material conveyor to stop the supply of the corn flakes. As a result, the supply of the corn flakes to the upper hopper 12 is stopped.

Thereafter, by driving the cutting motor 23, the rotating shaft 21 with the stirring vanes 22 is rotated, and the corn flakes are cut out at 500 g per minute from the outlet of the upper hopper 12. The cut corn flakes are fed into the lower hopper 14 through the drop chute 28. At that time, when the control unit 17 receives the detection signal from the lower light sensor 29, a command is sent from the control unit 17 to the cutting motor 23 to stop cutting off the corn flakes. As a result, the cutting of the corn flakes is stopped.

The corn flakes put into the lower hopper 14 tend to become agglomerates in the lower portion of the hopper by their own weight. However, by the rotation of the stirring rod 49 by rotation of the large diameter feeder 15A and the small diameter feeder 15B in the circumferential direction by each circumferential rotation motor 45, the lump is scraped off. Thereafter, the corn flakes in the lower hopper 14 are respectively supplied to the two large diameter feeders 15A and the three small diameter feeders 15B, and are respectively introduced into the corresponding weighing hoppers 55 from the outlets of the respective feeders. . Then, the corn flakes in the corresponding weighing hopper 55 are weighed by each load cell 53.

At this time, 90 g of corn flakes are respectively fed into the metering hoppers 55 of the two large feeding meters 16A. In addition, 5 g of corn flakes are respectively put into the measuring hoppers 55 of the three small feeding meters 16B.

On the basis of the weighing signal from each load cell 53, when the controller 17 recognizes that the corn flakes having a predetermined weight are put into the corresponding weighing hopper 55, the corresponding circumferential rotation motor ( A command to stop the rotation is issued at 45). As a result, the feeding of the corn flakes to the respective weighing hoppers 55 from the corresponding large diameter feeder 15A or small diameter feeder 15B is stopped.

Next, the weight of the sum total of the corn flakes supplied to the weighing hopper 55 of the two large feeding meters 16A and the weighing hopper 55 of the three small feeding meters 16B is the target weight value (100 g). Choose the combination of meter 16 that is the optimum weight (e.g. 99.99 g) closest to

At this time, one large input meter 16A of two is necessarily selected. As the remainder, two of the three small feeding meters 16B are selected. As described above, that one large input meter 16A is necessarily selected by subtracting 90 g of the corn flakes in the weighing hopper 55 of the large input meter 16A from the target weight value 100 g in advance. It means to reduce the size (10g).

When the target weight value is reduced to 10 g, the corn flakes that are equally divided by 5 g using two small-injection meters 16B are divided into 100 g evenly using the same three meters as before. It becomes smaller than the input weight (33g) of the cornflakes thrown into each measurement hopper 55 at the time of carrying out. For example, if the weighing accuracy of the conventional weighing machine is the same as that of the weighing machines 16A and 16B of Example 1 and is ± 1%, the degree of variation in the amount of the corn flakes added is equally equal to the target weight 100g as in the prior art. It becomes smaller than when divided into three. As a result, the precision of the combined weighing of cornflakes can be improved.

Example 2

Next, with reference to FIGS. 1-5, the combination counting method of the medicine pellet (measured substance) of a medicine is demonstrated using the combination counter 10A of the same structure as the combined metering apparatus 10 of Example 1. FIG. do. Here, a method of filling one (1 g) tablet of 100 (100 g) per bag is taken as an example.

In the weighing hopper 55 of each large input meter 16A, the maximum input weight (90.9 g) including the deviation (± 1%) of the input weight of the tablet is set to the target number value (100 pieces) of the combination coefficient. A pill of weight 90 g is injected which is smaller than the significant target weight value 100 g. In addition, the weighing hopper 55 of each small feeding meter 16B is smaller than the weight of the pill put into the large feeding meter 16A, and 1 at the target weight value 100g. Pills of a weight (5 g) which are smaller than the weight (10 g) minus the weight (90 g) of most pills are injected.

As shown in FIGS. 1-5, a tablet is supplied to the upper hopper 12 by the raw material conveyor which is not shown in figure. At that time, when the control unit 17 receives the detection signal from the upper optical sensor 20, a command is sent from the control unit 17 to the raw material conveyor to stop the supply of pills to the upper hopper 12. Thereby, supply of the tablet to the upper hopper 12 by a raw material conveyor is stopped.

The tablet supplied to the upper hopper 12 rotates the rotating shaft 21 with the stirring blade 22 by driving the cutting motor 23, and removes the tablet from the outlet of the upper hopper 12 per minute. Cut to 500 g. The pill which is cut out is put into the lower hopper 14 through the drop hopper 28. At that time, when the control unit 17 receives the detection signal from the lower optical sensor 29, a command is sent from the control unit 17 to the cutting motor 23 to stop the cutting of the pills. This stops the extraction of the pills.

The pill injected into the lower hopper 14 is the stirring rod 49 of the impeller 48 according to the rotation of the large diameter feeder 15A and the small diameter feeder 15B by the circumferential rotation motor 45 in the circumferential direction. It is cut out by the rotation of, and is then supplied to two large diameter feeders 15A and three small diameter feeders 15B, respectively. Next, pills are respectively injected into the corresponding weighing hopper 55 from the discharge port of each pipe feeder 15, and the pills in the corresponding weighing hopper 55 are measured by each load cell 53. As shown in FIG.

At this time, 90 g of tablets are respectively put into the metering hoppers 55 of the two large input metering machines 16A. In addition, 5 g of tablets are respectively put into the metering hoppers 55 of the three small feeding meters 16B.

On the basis of the weighing signal from each load cell 53, when the controller 17 recognizes that a pill of a predetermined weight has been put into the corresponding weighing hopper 55, the corresponding circumferential rotation motor ( A command to stop the rotation is issued at 45). As a result, the pill is stopped from the corresponding large diameter feeder 15A or the small diameter feeder 15B to the respective weighing hoppers 55 to be described later.

Next, the weight of the sum total of the pills supplied to the weighing hopper 55 of the two large feeding meters 16A and the weighing hopper 55 of the three small feeding meters 16B is the target weight value (100 g). Choose the combination of meter 16 that is the optimum weight (e.g. 99.99 g) closest to

At this time, it is assumed that one large input meter 16A is selected from two units. In the remainder, two of the three small feeding meters 16B are selected. The fact that one large input meter 16A is necessarily selected means that the target weight value is reduced by subtracting 90 g of the pill in the weighing hopper 55 of the large input meter 16A from the target weight value 100 g in advance ( 10g).

In this way, when the target weight value is reduced to 10 g, the weights of the pills equally divided by 5 g by 5 g using the two small-injection meters 16B are used in the same manner as before. In comparison with the injection weight (33 g) of the pellets put into each of the weighing hoppers 55 when the 100 g is equally divided. For example, if the weighing accuracy is the same as that of the conventional weighing machine, it is ± 1%, and the degree of variation in the input weight of the tablet is also smaller than when the target weight value 100g is equally divided into three parts as in the prior art. As a result, the precision of the combined coefficient of a pill can be improved.

In addition, the number of pills which are put into the said large input meter 16A and the small input meter 16B, respectively, represents the input error in the corresponding meter 16 by the number conversion by the following formula pill. When it cuts out, it is good also as a number to which the maximum value of an input error becomes less than one.

y = 1 / x... (One)

y is the number of pills in which the maximum value (+ 1%) of the dose error of the pill by the percentage in the large input meter 16A and the small input meter 16B becomes one by the number conversion of the pills. , x is the input error (± 1%) of the pill by the percentage in the large input meter 16A and the small input meter 16B.

That is, when the input error of the large input meter 16A is (± 1%), y is 1 / 0.01 = 100 pieces.

As described above, when the tablets are introduced into the large input meter 16A and the small input meter 16B, the maximum value of the input error is 1 when the input error of each of the meters 16A and 16B is expressed in number conversions. Only add pills that are less than the number of pills. For example, when the number of target injections exceeds this, for example, the tablets are introduced into the weighing units 16A and 16B in a plurality of times. Thereby, in each meter 16A, 16B, there is no error by the measurement about the number of pills computed from the weight of a pill. Therefore, more accurate counting of pills can be performed.

Claims (6)

One or more large input weighing meters into which the measured amount of the amount to be put becomes smaller than the target weight value of the combined weighing, including the deviation of the input weight of the weighed object, and the large feeding meter In addition, each of the weighed items which is smaller than the weighed material to be weighed in and weighed less than the value obtained by subtracting the weight of one or more weighed weighed objects from the target weight value of the combined weighing unit A supply step of supplying a measurement object to each of a plurality of small injection meters; A weighing step of measuring the weighed object put into each device by using the large input meter and the small input meter; A selection step of selecting a combination of the meters such that the weight of the total of the measured objects respectively supplied to the plurality of small input meters and the at least one large input meter is the optimum weight closest to the target weight value; And And a collection step of collecting each of the weighed objects in the selected meter. A to-be-measured object is a weight-quantized solid, and an amount of to-be-measured which the maximum input weight including the deviation of the input weight of the to-be-measured object becomes smaller than the target weight value which is equivalent to the target number value of the combined coefficient The weight of one or more large input weighing devices and the weighed object put into the large input weighing device and the weight of one or more weighed weighing objects of the large input weighing device at the target weight value. A supply step of supplying the to-be-measured article to a plurality of small-input metering units into which the to-be-measured article having a smaller weight than the subtracted value is respectively input; A weighing step of measuring the weighed object put into each device by using the large input meter and the small input meter; A selection step of selecting a combination of the meters such that the weight of the total of the measured objects respectively supplied to the plurality of small input meters and the at least one large input meter is the optimum weight closest to the target weight value; And And a collection step of collecting each of the weighed items in the selected meter and using the weighed objects as a target number. According to claim 2, wherein the number of objects to be put into each of the large input meter and the small input meter, the input error in the corresponding large input meter or small input meter, the measured object of the following formula When the number conversion by is shown, the combination coefficient method characterized in that the maximum value of the said input error was made into less than one. y = 1 / x y is the number of the to-be-measured object whose maximum value of the input error of the to-be-measured object by the percentage in the said large-input meter and the small-input meter becomes one by conversion of the number of objects to be measured, x is the input error of the to-be-measured object by the percentage in the said large input meter and the small input meter. delete delete delete

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