JP5701130B2 - Weighing device - Google Patents

Description

  The present invention relates to a weighing device. In particular, the present invention relates to a weighing device that adjusts the objects to be weighed of powder (detergent, fertilizer, etc.) and granules (resin pellets, grains, feed, etc.) to a predetermined target weight and fills a container such as a bag. .

  The demand for resins called engineering plastics for metal replacement is increasing due to the weight reduction of products and the ease of mass production of products using injection molding machines. Conventionally, a packer scale has been used to efficiently pack the resin pellets as the raw material for resin molding into a target weight.

  This packer scale is an automatic weighing device that adjusts the objects to be weighed such as powders (detergents, fertilizers, etc.) and granules (resin pellets, grains, feeds, etc.) to a predetermined target weight and fills them in containers such as bags. It is a kind. The packer scale is generally composed of various devices such as a loading cut gate, a hopper, a hopper gate, a load cell, and an actuator, and various types of packer scales have already been proposed according to the purpose of use.

  For example, a technique for supplying an object to be weighed to a hopper by opening and closing a cone gate is known (see Patent Documents 1, 2, and 3).

  Also, the weighing of objects to be weighed is made faster and more accurate by combining the volume of objects to be weighed into the hopper and the combination of a plurality of replenishing operations with different volume ratios (for example, 1: 2: 4: 8). Have been proposed (see Patent Documents 4, 5, and 6).

  There has also been proposed an apparatus intended to increase the speed and accuracy of weighing of objects to be weighed by inputting the volume of objects to be weighed into the hopper and replenishing charging by loss-in discharge (see Patent Document 7).

JP-A-62-207915 Japanese Utility Model Publication No. 52-127461 Japanese Utility Model Publication No. 54-90167 JP-A-8-278189 JP 2004-125422 A JP 62-9226 A Japanese Patent Laid-Open No. 10-54750

  In weighing objects to be weighed on a packer scale, it is generally considered that there is a trade-off between speeding up and accuracy. In other words, in order to improve the weighing accuracy of the object to be weighed by the packer scale, it is necessary to suppress the weighing speed of the object to be weighed. .

  By the way, the inventors of the present invention are diligently working on the development of a packer scale capable of weighing objects to be weighed such as resin pellets at high speed and with high accuracy. And in the process of this development, the mere design change of the existing equipment exemplified in Patent Documents 1 to 7 will improve the performance of the device in consideration of both high-speed and high-precision weighing of the objects to be weighed. It has gradually become clear that there is a limit. For this reason, it has been concluded that a drastic review of the structure of the conventional example is indispensable for the significant improvement of the performance of the packer scale (high speed and high accuracy of weighing of objects to be weighed).

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a weighing device in which the weighing speed and weighing accuracy of an object to be weighed are improved as compared with the conventional example.

  In order to solve the above-described problem, the present invention measures the object to be weighed and supplies the object to be weighed after being weighed by supplying an object to be weighed that is less than the target weight of the object to be weighed. A large throw-in weighing hopper, a cut gate disposed in the weighing hopper body above the large throw-in weighing hopper, and a cone valve disposed in the weighing hopper body above the cut gate, the cut gate Is closed and the cone valve is opened, the inside of the weighing hopper body between the cone valve and the cut gate is used as a volume weighing unit, the volume weighing unit is filled with the object to be weighed, and the cut Weighing is performed by opening the gate and closing the cone valve, so that the volume of the object to be weighed in the volume weighing unit is loaded into the large throw-in weighing hopper. To provide a location.

  Further, in the weighing device of the present invention, a combination operation based on the weight of the objects to be weighed is performed by supplying the objects to be weighed in which the weights of the objects to be weighed are adjusted at different ratios. A plurality of medium throw-in weighing hoppers from which the object to be weighed is discharged based on the result of the calculation, and a loss-in hopper that is used for loss-in weighing and from which the object to be weighed is discharged in loss may be further provided.

  With this configuration, the large throw-in weighing hopper, the plurality of medium throw-in weighing hoppers, and the loss-in hopper can be suitably cooperated in weighing and discharging the object to be weighed. As a result, the measurement speed and measurement accuracy of the object to be weighed can be improved as compared with the conventional example. For example, highly accurate loss-in discharge can be used to finally adjust the weight of the object to be weighed to the target weight. Therefore, the weighing device of the present invention can maintain the weighing accuracy (cut accuracy) of the object to be weighed with high accuracy.

  Further, by using the volume weighing of the objects to be weighed by the volume weighing unit, a large amount (for example, 95% or more) of the objects to be weighed can be put into the large input weighing hopper at once. As a result, the weighing (input) speed of the object to be weighed is improved, and as a result, the time required for one cycle of the object to be weighed, weighed and discharged by the weighing device can be shortened.

  In the measuring device of the present invention, a vibrator may be arranged on the wall portion of the volume measuring unit.

  With such a configuration, the object to be weighed in the volume measuring unit can be always in a tight pressure state by the vibration of the wall of the volume measuring unit. As a result, it is possible to suppress the change in the bulk density of the object to be weighed in the volume measuring unit, and consequently to suppress the change in the volume input weight of the object to be weighed discharged from the volume measuring unit.

  In the metering device of the present invention, the cone valve may include air venting means capable of guiding the air in the volume metering unit to the outside.

  With this configuration, even if the object to be weighed falls into the volume measuring unit while embracing air, the air in the volume measuring unit can be appropriately exhausted. As a result, it is possible to suppress the change in the bulk density of the object to be weighed in the volume measuring unit, and consequently to suppress the change in the volume input weight of the object to be weighed discharged from the volume measuring unit.

  In the weighing device of the present invention, the timing of loading the weighing object into the large input weighing hopper, the loading timing of the weighing object into the medium charging weighing hopper, and the weighing object into the loss-in hopper At least a pair of input timings among the input timings may be overlapped.

  For example, the input timing of the object to be weighed into the large input weighing hopper and the input timing of the object to be weighed into the medium input weighing hopper may be overlapped.

  Thereby, in the weighing device of the present invention, the weighing (feeding) speed of the object to be weighed is improved, and as a result, the time of one cycle of loading, weighing and discharging by the weighing device can be shortened.

  Further, in the weighing device of the present invention, the discharge timing of the object to be weighed from the large input weighing hopper, the discharge timing of the object to be weighed from the medium input weighing hopper, and the object to be weighed from the loss-in hopper The discharge timing may be overlapped.

  Thereby, in the weighing device of the present invention, the weighing (discharge) speed of the object to be weighed is improved, and as a result, the time of one cycle of input, weighing and discharging by the weighing device can be shortened.

Also, in the weighing apparatus of the present invention, in the combination calculation, the sum of the weights of the objects to be weighed in said charged weighing hopper is determined a combination of the in-throw input weighing hoppers closest to a predetermined combination target weight, the may discharge the objects to be weighed inside the tow entering the weighing hoppers selected in the combination.

Then, in the weighing apparatus of the present invention, the combination target weight, a target weight of the objects to be weighed, said the weight of the objects to be weighed DIS input weighing hopper, and the weight of the objects to be weighed by the Los Inn discharge , May be set based on.

  With such a configuration, the weighing device of the present invention can appropriately perform loss-in discharge of an object for final adjustment of the weight of the object to be measured following the combination discharge of the object to be measured (for example, loss-in discharge). The amount can be set to a small amount), and as a result, the measurement speed and measurement accuracy (cut accuracy) of the object to be measured can be improved.

  According to the present invention, it is possible to obtain a weighing device in which the weighing speed and weighing accuracy of an object to be weighed are improved as compared with the conventional example.

FIG. 1 is a diagram showing an example of a packer scale (weighing device) according to an embodiment of the present invention. FIG. 2 is a view of the packer scale of FIG. 1 viewed in the vertical direction. FIG. 2A shows a view of the packer scale of FIG. 1A as viewed from IIA-IIA. FIG. 2B shows a view of the packer scale of FIG. 1B viewed from IIB-IIB. FIG. 3 is a diagram showing a configuration example of the first, second, and third medium input weighing units of the packer scale of FIG. 4 is a diagram illustrating a configuration example of a fourth medium input weighing unit of the packer scale of FIG. 1 and a configuration example of a small input weighing unit of the packer scale of FIG. FIG. 5 is a diagram showing an example of the control system of the packer scale of FIG. FIG. 6 is a diagram illustrating an example of an operation for inputting an object to be weighed, a weighing operation, and a discharging operation by the packer scale according to the embodiment of the present invention. FIG. 6 shows an opening / closing timing chart of valves and gates used in the packer scale of FIG. FIG. 7 is a diagram illustrating an example of an operation for inputting an object to be weighed, a weighing operation, and a discharging operation by the packer scale according to the embodiment of the present invention. FIG. 7A shows a timing chart of the input and discharge of an object to be weighed by the packer scale of FIG. FIG. 7 (b) shows the change over time of the input (discharge) weight of the object to be weighed by the packer scale of FIG.

  Hereinafter, a specific configuration example of a weighing device according to an embodiment of the present invention will be described with reference to the drawings.

  In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof may be omitted.

  Further, the following specific description merely illustrates the characteristics of the weighing device. For example, when the following specific examples are described with appropriate reference numerals attached to the same or corresponding terms as the terms specifying the weighing device, the specific components are those of the corresponding weighing device. It is an example of a component.

  Accordingly, the features of the weighing device are not limited by the following specific description.

(Embodiment)
FIG. 1 is a diagram showing an example of a packer scale (weighing device) according to an embodiment of the present invention. FIG. 2 is a view of the packer scale of FIG. 1 viewed in the vertical direction. FIG. 2A shows a view of the packer scale 100 of FIG. 1A as viewed from IIA-IIA. FIG. 2B shows a view of the packer scale 100 of FIG. 1B viewed from IIB-IIB.

  As shown in FIGS. 1 and 2, the packer scale 100 of the present embodiment is a large input metering in which a large input (a large amount input) of an object (for example, resin pellets) to a packaging machine (not shown) is performed. Part 10, medium input weighing unit 50 that performs medium input (medium amount input) to the packaging machine, and small input measurement unit that performs small input (small amount input) to the packaging machine 30.

  For convenience of the following description, in FIG. 1 (FIGS. 2, 3 and 4 are also the same), the object to be weighed starts from the middle (vertical height H) of the large input weighing unit 10 and the medium input weighing unit 50 and small The direction in which the objects to be weighed are distributed to the input weighing unit 30 is “left-right direction”. The side on which the main part of the medium throw-in weighing unit 50 is arranged is “left”, and the side on which the small throw-in weighing unit 30 is arranged is “right”.

  Further, assuming that the direction in which gravity acts is a vertical direction (not shown), gravity acts from “upper” (not shown) to “lower” (not shown).

  In addition, the front-rear direction is a direction perpendicular to the left-right direction and the vertical direction. FIG. 1A shows the front side of the paper as “front” and the back side as “rear”.

  Further, in FIG. 1A, in order to make it easier to understand the configuration of the small input weighing unit 30 of the packer scale 100, the constituent elements of the middle input weighing unit 50 arranged on the right side of the packer scale 100 (described later). 4 is not shown.

  Further, in FIG. 1 (b), only the configuration of the large input weighing unit 10 of the packer scale 100 is illustrated for easy understanding of the configuration of the large input weighing unit 10 of the packer scale 100, and FIG. In FIG. 2B, some of the components (a cone gate and its drive system described later) of the large throw-in weighing unit 10 are not shown.

  The configuration of the main part (first, second, and third intermediate input weighing units 50A, 50B, 50C described later) of the intermediate input weighing unit 50 arranged on the left side of the packer scale 100 is shown in FIG. Yes. Further, the configuration of a part of the middle throwing weighing unit 50 (fourth middle throwing weighing unit 50D described later) and the small throwing weighing unit 30 arranged on the right side of the packer scale 100 is shown in FIG. An example of the control system of the packer scale 100 is shown in FIG.

[Configuration of the large input weighing unit]
First, the configuration of the large throw-in weighing unit 10 of the packer scale 100 of the present embodiment will be described in detail with reference to the drawings.

  As shown in FIG. 1, the large throw-in weighing unit 10 includes a weighing hopper body 20 erected in the vertical direction, and a large throw-in weighing hopper 21 arranged below the weighing hopper body 20.

  As shown in FIGS. 1 and 2, the weighing hopper main body 20 is arranged at the center of the packer scale 100 and is a box body having an upper end portion 11 and a lower end portion.

  As shown in FIG. 2B, a circular supply port 12 for supplying an object to be weighed is formed in the central portion of the weighing hopper body 20 near the rear end of the upper end portion 11. An object to be weighed is put into the weighing hopper body 20 through the supply port 12.

  Moreover, as shown in FIG.2 (b), as shown in FIG.2 (b), a pair of mesh-shaped three air vent parts 13 are formed in the front right corner of the upper end part 11 of the weighing hopper main body 20, and a right and left corner. Is provided. When an object to be weighed is introduced from the supply port 12 of the weighing hopper body 20, the object to be weighed may embed air. Therefore, the packer scale 100 of the present embodiment is configured to exhaust the air in the weighing hopper body 20 using the air vent 13. Thereby, the bulk density of the to-be-measured object in the measurement hopper main body 20 is kept constant.

  A discharge port (not shown) for discharging an object to be weighed is formed at the lower end of the weighing hopper body 20. As a result, the object to be weighed is discharged from the main discharge port to the outside of the weighing hopper main body 20 (here, inside the large throw-in weighing hopper 21).

  However, when the object to be weighed is not discharged from the discharge port of the weighing hopper body 20 (when the object to be weighed is temporarily held in the weighing hopper body 20), this discharge port is connected to the weighing hopper body 20 as shown in FIG. It can be closed using a pair of large input cut gates 15A and 15B arranged at the lower end of each. The large throw cut gates 15 </ b> A and 15 </ b> B are arranged directly above the large throw weighing hopper 21.

  The large insertion cut gates 15A and 15B are configured to be swingable in the front-rear direction about the rotation shafts 14A and 14B, respectively, as shown in FIG. That is, the large insertion cut gates 15A and 15B are moved forward and backward by rotating the rotating shafts 14A and 14B using the driving force of the AC servomotor 14 (see FIGS. 1A, 2 and 5). It will move in 2 minutes. At this time, the opening degree of the large throw cut gates 15A and 15B is controlled by the instruction controller 71 for controlling the large throw metering unit using the rotary encoder 70 as shown in FIG. The driving of the AC servo motor 14 is controlled by the instruction controller 71 using an AC servo driver 74.

  Moreover, as shown in FIG.1 (b), the large injection | throwing-in measurement part 10 is provided with the cone valve 80 and the drive system which can drive the cone valve 80. As shown in FIG. The cone valve 80 is disposed in the weighing hopper main body 20 directly above the large input cut gates 15A and 15B, and the drive system of the cone valve 80 is disposed outside the weighing hopper main body 20.

  As shown in FIG. 1B, the cone valve 80 includes a disc-shaped valve body 81, a cylindrical valve seat 82, and a valve shaft 83 having a hollow structure connected to the valve body 81 and extending in the vertical direction. Prepare.

  As shown in FIG. 1B, since the upper cone surface 81A and the lower cone surface 81B of the valve body 81 are both formed in a conical shape, the inside of the valve body 81 is hollow. And the shape of both is set so that the valve body 81 and the valve seat 82 can contact. Therefore, by adjusting the lift amount of the valve body 81, contact between the valve body 81 and the valve seat 82 (see the solid line in FIG. 1B) and release of contact (two points of FIG. 1B). As a result, the cone valve 80 can be opened and closed.

  The drive system of the cone valve 80 includes a pair of air cylinders 86A and 86B (not shown in the drawing on the back side of the drawing), which are fixed to the outer wall surface of the weighing hopper body 20, and the air cylinder 86A. , 86B, and a connecting member 87 connected to each piston rod. The valve shaft 83 that supports the valve body 81 extends from the measuring hopper body 20 through the bearing box 88 to the outside of the measuring hopper body 20 and is connected to the connecting member 87.

  Therefore, when the strokes of the piston rods of the air cylinders 86A and 86B contract, the valve shaft 83 and the valve body 81 move downward as indicated by the two-dot chain line in FIG. Will open. On the other hand, when the strokes of the piston rods of the air cylinders 86A and 86B extend, the valve shaft 83 and the valve body 81 move upward as shown by the solid lines in FIG. The body 81 comes into contact with the valve seat 82 and the cone valve 80 is closed. As shown in FIG. 5, the driving of each of the air cylinders 86A and 86B is controlled by an instruction controller 71 for controlling the large throw-in weighing unit. In this way, the lift amount of the valve body 81 is adjusted based on the driving forces of the air cylinders 86A and 86B.

  As described above, when the large input cut gates 15A and 15B are closed and the cone valve 80 is opened, the object to be weighed flows through the gap between the valve element 81 and the valve seat 82 by the action of gravity (see FIG. 5). An object to be weighed can be filled in the area of the weighing hopper main body 20 between the 80 and the large input cut gates 15 and 15B.

  At this time, since the internal volume of the region is constant, this region can be used for the volume measuring unit 20A. That is, assuming that the bulk density of the object to be weighed in the volume measuring unit 20A is constant, when the object to be weighed is filled in the entire volume measuring unit 20A, the object to be weighed is based on the internal volume of the volume measuring unit 20A. The filling weight can be grasped.

  In the packer scale 100 of the present embodiment, various devices for keeping the bulk density of the objects to be weighed in the volume measuring unit 20A constant are also provided.

  First, the cone valve 80 includes air venting means capable of guiding the air in the volume measuring unit 20A to the outside. Here, the air venting means is constituted by a large number of small openings provided in the lower cone surface 81B of the valve body 81, a hollow area of the valve body 81, and a hollow area of the valve shaft 83. That is, the cone valve 80 guides the air in the volume measuring portion 20A from the opening of the lower cone surface 81B of the valve body 81 into the valve body 81, and then, as shown by the one-dot chain line arrow in FIG. It is configured such that air can be exhausted to the outside through a hollow region of the valve shaft 83. Thus, even if the object to be weighed falls into the volume measuring unit 20A while embracing air, the air in the volume measuring unit 20A can be appropriately exhausted. As a result, it is possible to suppress the change in the bulk density of the object to be weighed in the volume measuring unit 20A, and consequently to suppress the change in the volume input weight of the object to be weighed discharged from the volume measuring unit 20A.

  Second, the vibrator 90 is disposed on the outer wall surface (wall portion) of the volume measuring unit 20A. Here, the air vibrator 90 is used as the vibrator 90, but is not limited thereto. For example, a piezoelectric vibration element may be used as the vibrator 90.

  As described above, the vibration of the air vibrator 90 is applied to the wall portion of the volume measuring unit 20A. Then, the object to be weighed in the volume measuring unit 20A can be always in a tight pressure state by the vibration of the wall of the volume measuring unit 20A. As a result, a change in the bulk density of the object to be weighed in the volume measuring unit 20A can be suppressed, and as a result, a change in the weight of the object to be weighed discharged from the volume measuring unit 20A can be suppressed. As shown in FIG. 5, the driving of the air vibrator 90 is controlled by an instruction controller 71 for controlling the large throw-in weighing unit.

  Conversely, by opening the large input cut gates 15A and 15B and closing the cone valve 80, it is possible to input the volume of the object to be weighed in the volume measuring unit 20A to the large input weighing hopper 21.

  Thus, in the packer scale 100 of the present embodiment, the discharge port of the weighing hopper body 20 (volume weighing unit 20A) is closed using the large loading cut gates 15A and 15B, and the loading port of the volume weighing unit 20A is closed. When the cone valve 80 is opened, the object to be weighed is filled in the volume measuring unit 20A. On the other hand, when the discharge port of the weighing hopper main body 20 (volume measuring unit 20A) is opened using the large input cut gates 15A and 15B, and the input port of the volume measuring unit 20A is closed using the cone valve 80, A constant-volume object to be weighed in the volume weighing unit 20 </ b> A is supplied into the large input weighing hopper 21.

  As shown in FIG. 1, the large throw-in weighing hopper 21 temporarily holds the weighing object supplied from the volume weighing unit 20A, and discharges the weighing object to the collective chute 22 arranged below it. A weighing hopper body 21A and a pair of large throw-in weighing hopper gates 18A and 18B are provided.

  The large throw-in weighing hopper 21 is connected to four load cells LC1, LC2, LC3, and LC4, and is supported by these load cells LC1, LC2, LC3, and LC4. Note that the load cells LC1, LC2, LC3, and LC4 are fixed to a pedestal of the packer scale 100.

  As shown in FIG. 5, the load signals (electric signals) output from the load cells LC1, LC2, LC3, and LC4 are known signal processing circuits (A / D converters, amplifiers, filters, etc .; not shown) To the instruction controller 71.

  A collecting chute 22 is disposed below the large throw-in weighing hopper 21 as shown in FIG. An object to be weighed discharged from the large input weighing hopper 21 slides down on the collecting chute 22 and is sent to, for example, a packaging machine (not shown) from a lower discharge port (not shown).

  Each of the large throw-in weighing hopper gates 18A and 18B is configured to be swingable to the left and right using a link portion having a known toggle mechanism as shown in FIG. That is, the large throw-in weighing hopper gates 18A and 18B move so as to be divided into left and right as the link portion moves using the driving force of the rotary actuator 17 (see FIG. 5). As shown in FIG. 5, the driving of the rotary actuator 17 is controlled by the instruction controller 71.

  As described above, in the packer scale 100 of the present embodiment, the instruction controller 71 measures the weight of the object to be weighed in the large throw-in weighing hopper body 21A based on the output signals from the load cells LC1, LC2, LC3, and LC4. it can. Thereafter, when the instruction controller 71 receives a discharge permission signal for an object to be weighed from the packaging machine, for example, when the discharge port of the large throw-in weighing hopper 21 is opened by the large throw-in weighing hopper gates 18A and 18B, the weighing is performed. The later objects to be weighed are sent to the collecting chute 22.

[Structure of the medium throw-in weighing unit]
Hereinafter, the configuration of the middle throw-in weighing unit 50 of the packer scale 100 of the present embodiment will be described in detail with reference to the drawings.

  As shown in FIGS. 1, 2, and 3, the medium throw-in weighing unit 50 includes a first medium throw-in weighing unit 50 </ b> A, a second medium throw-in weighing unit 50 </ b> B, and a third medium throw-in weighing unit 50 </ b> C. As shown in FIGS. 2 and 4, the medium throw-in weighing unit 50 also includes a fourth medium throw-in weighing unit 50 </ b> D.

<Configuration of first medium charging weighing unit 50A>
First, the configuration of the first medium throw-in weighing unit 50A will be described.

  As shown in FIG. 2 and FIG. 3, the first middle throwing weighing unit 50 </ b> A includes a first middle throwing chute 61 and a first middle throwing weighing hopper 64 arranged below the first middle throwing chute 61.

  Further, as shown in FIGS. 2 and 3, the first middle throwing chute 61 is arranged on the left side and the front side of the packer scale 100, and has an upper end portion and a lower end portion 61B (see FIG. 3) in the vertical direction. It is a substantially cylindrical body that stands upright. Further, the inside (upper end portion) of the first middle throwing chute 61 includes a hollow structure relay portion 60 (see also FIG. 1) connected to the left side surface of the weighing hopper body 20, and a front side at the lower end portion of the relay portion 60. The first middle charging branch portion 60A having a hollow structure that branches into the measuring hopper body 20 communicates with the inside of the weighing hopper body 20.

  A discharge port (not shown) for discharging an object to be weighed is formed at the lower end portion 61B of the first middle charging chute 61. As a result, the object to be weighed is discharged from the main discharge port to the outside of the first middle throwing chute 61 (here, in the first middle throwing weighing hopper 64).

  However, when the object to be weighed is not discharged from the outlet of the first middle charging chute 61 (when the object to be weighed is temporarily held in the first middle charging chute 61), as shown in FIG. It can be blocked by using the first middle insertion cut gate 54.

  As shown in FIG. 3, the first middle insertion cut gate 54 is configured to be swingable in the front-rear direction about the rotation shaft 51A. That is, in the first middle throwing cut gate 54 placed immediately below the discharge port of the first middle throwing chute 61, the rotary shaft 51A has the driving force of the rotary actuator 51 (see FIGS. 1, 2 and 5). By using and rotating, it moves backward.

  In this way, the discharge port of the first middle throwing chute 61 is opened using the first middle throwing cut gate 54, whereby a predetermined amount of the object to be weighed in the first middle throwing chute 61 is It is supplied into the medium throw-in weighing hopper 64. As shown in FIG. 5, the driving of the rotary actuator 51 is controlled by an instruction controller 73 for controlling the middle throw-in weighing unit.

  As shown in FIGS. 1 and 3, the first middle throw-in weighing hopper 64 temporarily holds the objects to be weighed supplied from the first middle throw-in chute 61, and the collecting chute 22 (see FIG. 1) disposed below the first weighing-in weighing hopper 64. ) Is provided with a first medium throw-in weighing hopper main body 64A and a first medium throw-in weighing hopper gate 67.

  Further, as shown in FIG. 1 and FIG. 5, the first medium throw-in weighing hopper 64 is connected to and supported by the load cell LC5. The load cell LC5 is fixed to the pedestal of the packer scale 100.

  As shown in FIG. 5, the load signal (electrical signal) output from the load cell LC5 passes through a known signal processing circuit (A / D converter, amplifier, filter, etc .; not shown), and the instruction controller 73. Is input.

  Further, as shown in FIG. 1, a collecting chute 22 is disposed below the first medium throwing weighing hopper 64. The objects to be weighed discharged from the first medium throw-in weighing hopper 64 slide down on the collecting chute 22 and are sent to, for example, a packaging machine (not shown) from a lower discharge port (not shown).

  Further, as shown in FIG. 1A, the first middle throw-in weighing hopper gate 67 is configured to be opened and closed by using a known toggle mechanism and a driving force of a rotary actuator 57 (see also FIG. 5). As shown in FIG. 5, the driving of the rotary actuator 57 is controlled by the instruction controller 73. In addition to the rotary actuator 57, a stepping motor may be used as a driving device for the first medium throw-in weighing hopper gate 67.

  As described above, in the packer scale 100 of the present embodiment, the instruction controller 73 can measure the weight of the object to be weighed in the first medium throw-in weighing hopper body 64A based on the output signal from the load cell LC5. Thereafter, when the instruction controller 73 receives, for example, a discharge permission signal for an object to be weighed from the packaging machine, the discharge port of the first medium charging weighing hopper 64 is opened by the first medium charging weighing hopper gate 67. The weighed objects after weighing are sent to the collecting chute 22.

<Configuration of the second middle charging weighing unit 50B>
Next, the configuration of the second medium throw-in weighing unit 50B will be described.

  As shown in FIGS. 2 and 3, the second middle throwing weighing unit 50 </ b> B includes a second middle throwing chute 62 and a second middle throwing weighing hopper 65 arranged below the second middle throwing chute 62.

  Further, as shown in FIGS. 2 and 3, the second middle throwing chute 62 is arranged on the left side and the center of the packer scale 100, and has an upper end portion and a lower end portion 62B (see FIG. 3) in the vertical direction. It is a substantially cylindrical body that stands upright. Further, the inside (upper end portion) of the second middle throwing chute 62 has a hollow relay portion 60 (see also FIG. 1) connected to the left side surface of the weighing hopper body 20 and a central portion at the lower end portion of the relay portion 60. And a second intermediate charging branch portion 60B having a hollow structure that branches into the inside of the weighing hopper body 20.

  A discharge port (not shown) for discharging an object to be weighed is formed at the lower end portion 62B of the second middle charging chute 62. As a result, the object to be weighed is discharged from the main discharge port to the outside of the second middle throwing chute 62 (here, in the second middle throwing weighing hopper 65).

  However, when the object to be weighed is not discharged from the outlet of the second middle charging chute 62 (when the object to be weighed is temporarily held in the second middle charging chute 62), the outlet is set as shown in FIG. The second medium insertion cut gate 55 can be used for the closing.

  As shown in FIG. 3, the second middle insertion cut gate 55 is configured to be swingable in the front-rear direction about the rotation shaft 52 </ b> A. That is, in the second middle throwing cut gate 55 placed immediately below the outlet of the second middle throwing chute 62, the rotary shaft 52A has the driving force of the rotary actuator 52 (see FIGS. 1, 2 and 5). By using and rotating, it moves backward.

  In this manner, the discharge port of the second middle throwing chute 62 is opened using the second middle throwing cut gate 55, whereby a predetermined amount of the object in the second middle throwing chute 62 is It is supplied into the medium throw-in weighing hopper 65. As shown in FIG. 5, the driving of the rotary actuator 52 is controlled by the instruction controller 73.

  As shown in FIGS. 1 and 3, the second middle throw-in weighing hopper 65 temporarily holds the objects to be weighed supplied from the second middle throw-in chute 62, and the collecting chute 22 (see FIG. 1) disposed below the second weighing-in weighing hopper 65. ), A second medium throw-in weighing hopper main body 65A and a second medium throw-in weighing hopper gate 68 are provided.

  Further, as shown in FIG. 1 and FIG. 5, the second middle throw-in weighing hopper 65 is connected to and supported by the load cell LC6. The load cell LC6 is fixed to the pedestal of the packer scale 100.

  As shown in FIG. 5, the load signal (electrical signal) output from the load cell LC6 passes through a known signal processing circuit (A / D converter, amplifier, filter, etc .; not shown) and the instruction controller 73. Is input.

  Further, as shown in FIG. 1, a collective chute 22 is disposed below the second medium charging weighing hopper 65. The objects to be weighed discharged from the second medium input weighing hopper 65 slide down on the collecting chute 22 and are sent to, for example, a packaging machine (not shown) from a lower discharge port (not shown).

  Further, as shown in FIG. 1A, the second middle throw-in weighing hopper gate 68 is configured to be opened and closed by using a known toggle mechanism and the driving force of the rotary actuator 58 (see also FIG. 5). As shown in FIG. 5, the driving of the rotary actuator 58 is controlled by the instruction controller 73. In addition to the rotary actuator 58, a stepping motor may be used as a driving device for the second medium throw-in weighing hopper gate 68.

  As described above, in the packer scale 100 of the present embodiment, the instruction controller 73 can measure the weight of the object to be weighed in the second medium throw-in weighing hopper main body 65A based on the output signal from the load cell LC6. Thereafter, when the instruction controller 73 receives, for example, a discharge permission signal for an object to be weighed from the packaging machine, the discharge port of the second medium input weighing hopper 65 is opened by the second medium input weighing hopper gate 68. The weighed objects after weighing are sent to the collecting chute 22.

<Configuration of the third middle charging weighing unit 50C>
Next, the configuration of the third medium throw-in weighing unit 50C will be described.

  As shown in FIGS. 2 and 3, the third middle throwing weighing unit 50 </ b> C includes a third middle throwing chute 63 and a third middle throwing weighing hopper 66 disposed below the third middle throwing chute 63.

  Further, as shown in FIGS. 2 and 3, the third middle throwing chute 63 is arranged on the left side and the rear side of the packer scale 100, and has an upper end portion and a lower end portion 63B (see FIG. 3) in the vertical direction. It is a substantially cylindrical body that stands upright. Further, the inside (upper end portion) of the third middle throwing chute 63 is connected to the hollow structure relay portion 60 (see also FIG. 1) connected to the left side surface of the weighing hopper main body 20 and the lower end portion of the relay portion 60. The inside of the weighing hopper main body 20 is communicated with the third middle charging branch portion 60C having a hollow structure that branches to the side.

  A discharge port (not shown) for discharging an object to be weighed is formed at the lower end portion 63B of the third middle charging chute 63. As a result, the object to be weighed is discharged from the main discharge port to the outside of the third middle throwing chute 63 (here, in the third middle throwing weighing hopper 66).

  However, when the object to be weighed is not discharged from the outlet of the third middle charging chute 63 (when the object to be weighed is temporarily held in the third middle charging chute 63), the outlet is set as shown in FIG. It can be closed using the third middle insertion cut gate 56.

  As shown in FIG. 3, the third middle insertion cut gate 56 is configured to be swingable in the front-rear direction about the rotation shaft 53 </ b> A. That is, in the third middle throwing cut gate 56 placed immediately below the discharge port of the third middle throwing chute 63, the rotary shaft 53A has the driving force of the rotary actuator 53 (see FIGS. 1, 2 and 5). By using and rotating, it moves backward.

  In this way, the discharge port of the third middle throwing chute 63 is opened using the third middle throwing cut gate 56, whereby a predetermined amount of the object in the third middle throwing chute 63 is third. It is supplied into the medium throw-in weighing hopper 66. As shown in FIG. 5, the drive of the rotary actuator 53 is controlled by the instruction controller 73.

  As shown in FIGS. 1 and 3, the third middle throw-in weighing hopper 66 temporarily holds the objects to be weighed supplied from the third middle throw-in chute 63, and the collective chute 22 (see FIG. 1) disposed below it. 3) a third medium throw-in weighing hopper body 66A and a third medium throw-in weighing hopper gate 69 for discharging the object to be weighed.

  Further, as shown in FIGS. 1 and 5, the third medium charging weigh hopper 66 is connected to and supported by the load cell LC7. The load cell LC7 is fixed to the pedestal of the packer scale 100.

  As shown in FIG. 5, the load signal (electrical signal) output from the load cell LC7 passes through a known signal processing circuit (A / D converter, amplifier, filter, etc .; not shown) and the instruction controller 73. Is input.

  Further, as shown in FIG. 1, the collective chute 22 is disposed below the third middle throwing weighing hopper 66. The objects to be weighed discharged from the third medium charging weigh hopper 66 slide down on the collecting chute 22 and are sent to, for example, a packaging machine (not shown) from a lower discharge port (not shown).

  Further, as shown in FIG. 1A, the third middle throw-in weighing hopper gate 69 is configured to be opened and closed by using a known toggle mechanism and a driving force of a rotary actuator 59 (see also FIG. 5). As shown in FIG. 5, the drive of the rotary actuator 59 is controlled by the instruction controller 73. In addition to the rotary actuator 59, a stepping motor may be used as a driving device for the third medium throw-in weighing hopper gate 69.

  As described above, in the packer scale 100 of the present embodiment, the instruction controller 73 can measure the weight of the object to be weighed in the third medium throw-in weighing hopper body 66A based on the output signal from the load cell LC7. Thereafter, when the instruction controller 73 receives, for example, a discharge permission signal for an object to be weighed from the packaging machine, the discharge port of the third medium charging weighing hopper 66 is opened by the third medium charging weighing hopper gate 69. The weighed objects after weighing are sent to the collecting chute 22.

<Configuration of the fourth middle charging weighing unit 50D>
Next, the configuration of the fourth medium throw-in weighing unit 50D will be described.

  As shown in FIGS. 2 and 4, the fourth middle throwing weighing unit 50 </ b> D includes a fourth middle throwing chute 43 and a fourth middle throwing weighing hopper 44 disposed below the fourth middle throwing chute 43.

  Further, as shown in FIGS. 2 and 4, the fourth middle throwing chute 43 is arranged on the right side and the front side of the packer scale 100, and has an upper end portion and a lower end portion 43B (see FIG. 4) in the vertical direction. It is a substantially cylindrical body that stands upright. Further, the inside (upper end) of the fourth middle throwing chute 43 has a hollow relay portion 40 (see also FIG. 1) connected to the right side surface of the weighing hopper body 20 and a front end at the lower end portion of the relay portion 40. And a fourth middle charging branch portion 40B having a hollow structure that branches into the measuring hopper body 20 and communicates with the inside of the weighing hopper main body 20.

  A discharge port (not shown) for discharging the object to be weighed is formed in the lower end portion 43B of the fourth middle charging chute 43. As a result, the object to be weighed is discharged from the main discharge port to the outside of the fourth middle charging chute 43 (herein, the fourth middle charging weighing hopper 44).

  However, when the object to be weighed is not discharged from the outlet of the fourth middle charging chute 43 (when the object to be weighed is temporarily held in the fourth middle charging chute 43), the outlet is as shown in FIG. It can be closed by using the fourth middle insertion cut gate 37.

  As shown in FIG. 4, the fourth middle insertion cut gate 37 is configured to be swingable in the left-right direction about the rotation shaft 36A. In other words, in the fourth middle throw cut gate 37 placed immediately below the outlet of the fourth middle throw chute 43, the rotary shaft 36A uses the driving force of the rotary actuator 36 (see also FIGS. 2 and 5). By rotating, it moves backward.

  In this way, the discharge port of the fourth middle throwing chute 43 is opened using the fourth middle throwing cut gate 37, whereby a predetermined amount of the object in the fourth middle throwing chute 43 becomes the fourth. It is supplied into the medium throw-in weighing hopper 44. As shown in FIG. 5, the driving of the rotary actuator 36 is controlled by the instruction controller 73.

  As shown in FIG. 4, the fourth middle throw-in weighing hopper 44 temporarily holds the objects to be weighed supplied from the fourth middle throw-in chute 43 and puts it on the collecting chute 22 (see FIG. 1) disposed below it. A fourth medium throw-in weighing hopper main body 44A and a fourth medium throw-in weighing hopper gate 38 for discharging the weighing object are provided.

  Further, the fourth middle charging hopper 44 is connected to and supported by the load cell LC9 (see FIG. 5). The load cell LC9 is fixed to the pedestal of the packer scale 100.

  As shown in FIG. 5, the load signal (electrical signal) output from the load cell LC9 passes through a known signal processing circuit (A / D converter, amplifier, filter, etc .; not shown) and the instruction controller 73. Is input.

  Further, as shown in FIG. 1, the collective chute 22 is disposed below the fourth medium throw-in weighing hopper 44. The objects to be weighed discharged from the fourth medium input weighing hopper 44 slide down on the collective chute 22 and are sent to, for example, a packaging machine (not shown) from a lower discharge port (not shown).

  Further, the fourth middle throw-in weighing hopper gate 38 is configured to be opened and closed using a known toggle mechanism (not shown) and the driving force of the rotary actuator 39 (see FIG. 5). As shown in FIG. 5, the driving of the rotary actuator 39 is controlled by the instruction controller 73. In addition to the rotary actuator 39, a stepping motor may be used as a drive device for the fourth medium throw-in weighing hopper gate 38.

  As described above, in the packer scale 100 of the present embodiment, the instruction controller 73 can measure the weight of the object to be weighed in the fourth medium throw-in weighing hopper body 44A based on the output signal from the load cell LC9. Thereafter, when the instruction controller 73 receives a discharge permission signal for an object to be weighed from the packaging machine, for example, the discharge port of the fourth medium input weighing hopper 44 is opened by the fourth medium input measurement hopper gate 38. The weighed objects after weighing are sent to the collecting chute 22.

[Configuration of small input weighing unit]
Hereinafter, the configuration of the small input weighing unit 30 of the packer scale 100 of this embodiment will be described in detail with reference to the drawings.

  As shown in FIGS. 1, 2, and 4, the small input weighing unit 30 includes a loss-in input chute 41 and a loss-in hopper 42 disposed below the loss-in input chute 41.

  As shown in FIGS. 1, 2, and 4, the loss-in charging chute 41 is disposed on the right side and the rear side of the packer scale 100 and has an upper end portion and a lower end portion 41 </ b> B (see FIG. 4) and stands in the vertical direction. It is a substantially cylindrical body to be installed. Further, the inside (upper end portion) of the loss-in charging chute 41 branches backward at the hollow structure relay portion 40 (see also FIG. 1) connected to the right side surface of the weighing hopper body 20 and the lower end portion of the relay portion 40. The small hopper branch portion 40A having a hollow structure communicates with the inside of the weighing hopper body 20.

  A discharge port (not shown) for discharging an object to be weighed is formed at the lower end portion 41B of the loss-in input chute 41. Thereby, the object to be weighed is discharged from the main discharge port to the outside of the loss-in input chute 41 (herein, the loss-in hopper 42).

  However, when the object to be weighed is not discharged from the discharge port of the loss-in charging chute 41 (when the object to be weighed is temporarily held in the loss-in charging chute 41), the discharge port is connected to the loss-in as shown in FIGS. It can be closed using the input gate 31.

  As shown in FIGS. 1 and 4, the loss-in insertion gate 31 is configured to be swingable in the left-right direction around the rotation shaft 34 </ b> A. In other words, the loss-in insertion gate 31 placed immediately below the discharge port of the loss-in insertion chute 41 has the rotation shaft 34A rotated by using the driving force of the rotary actuator 34 (see also FIGS. 2 and 5). Move back to the right (see also Figure 1).

  In this way, the discharge port of the loss-in input chute 41 is opened using the loss-in input chute 31, whereby a predetermined amount of the weighing object in the loss-in input chute 41 is supplied into the loss-in hopper 42. As shown in FIG. 5, the driving of the rotary actuator 34 is controlled by an instruction controller 72 for controlling the small throw-in weighing unit.

  The loss-in hopper 42 is arranged on the right side and the rear side of the packer scale 100 in the same manner as the loss-in input chute 41, and has an upper end portion 42A (see FIG. 4) and a lower end portion 42B (see FIG. 4), and stands in the vertical direction. It is a substantially cylindrical body to be installed. That is, the loss-in throwing chute 41 and the loss-in hopper 42 are arranged side by side in the vertical direction sharing these central axes (not shown).

  A discharge port (not shown) for discharging an object to be weighed is formed at the lower end portion 42B of the loss-in hopper 42. As a result, the object to be weighed is discharged from the main discharge port to the outside of the loss-in hopper 42 (here, the collecting chute 22).

  However, when the object to be weighed is not discharged from the discharge port of the loss-in hopper 42 (when the object to be weighed is temporarily held in the loss-in hopper 42), the discharge port is connected to the loss-in discharge gate 32 (see FIG. 1 and FIG. 4). It can be closed using an auxiliary hopper).

  As shown in FIGS. 1 and 4, the loss-in discharge gate 32 is configured to be swingable in the left-right direction around the rotation shaft 35 </ b> A. In other words, the loss-in discharge gate 32 placed directly below the discharge port of the loss-in hopper 42 moves backward to the left as the rotating shaft 35A rotates using the driving force of the rotary actuator 35 (see also FIG. 5). (See also FIG. 1).

  In this way, the discharge port of the loss-in hopper 42 is opened using the loss-in discharge gate 32, whereby the objects to be weighed in the loss-in hopper 42 are supplied to the collecting chute 22. As shown in FIG. 5, the driving of the rotary actuator 35 is controlled by the instruction controller 72.

  Further, the loss-in hopper 42 is connected to and supported by the load cell LC8 (see also FIG. 5) as shown in FIG. Note that the load cell LC8 is fixed to the pedestal of the packer scale 100.

  As shown in FIG. 5, the load signal (electrical signal) output from the load cell LC8 passes through a known signal processing circuit (A / D converter, amplifier, filter, etc .; not shown) and the instruction controller 72. Is input.

  As described above, in the packer scale 100 of the present embodiment, for example, when the instruction controller 72 receives a discharge permission signal for an object to be weighed from the packaging machine, the discharge port of the loss-in hopper 42 is opened by the loss-in discharge gate 32. The object to be weighed in the fourth medium throw-in weighing hopper main body 44A is lost-in discharged based on the output signal from the load cell LC8. Note that the diameter of the loss-in hopper 42 is set to an appropriate value based on the bulk density of the object to be weighed so that the amount of the object to be weighed in the loss-in discharge becomes constant. Thereby, an appropriate amount of objects to be weighed can be sent to the collecting chute 22 within a predetermined time.

[Configuration of Packer Scale Control System]
The above instruction controllers 71, 72, 73 are, for example, a calculation unit (not shown) made up of a microcontroller, MPU, PLC (Programmable Logic Controller), logic circuit, etc., and a memory unit made up of ROM, RAM, etc. (Not shown), a display unit (not shown) including a weight display unit, a message display unit, and the like, and a key input unit (not shown) through which an operator can input various data.

  In the packer scale 100 of this embodiment, as shown in FIG. 5, the instruction controllers 71, 72, and 73 are configured by three controllers that are distributed in cooperation with each other. Absent. For example, the instruction controllers 71, 72, and 73 may be configured by a single controller that performs centralized control.

  As described above, the instruction controller 71 controls the operation of the actuators (such as the AC servo motor 14 and the rotary actuator 17) for opening and closing the large throw cut gates 15A and 15B and the large throw weighing hopper gates 18A and 18B. Each operation of the air cylinders 86A and 86B for opening and closing the gate 80 is also controlled. The instruction controller 71 also controls the operation of the air vibrator 90. Further, the instruction controller 71 receives output signals from the load cells LC1, LC2, LC3, and LC4 that support the large throw-in weighing hopper 21, and based on this output signal, the instruction controller 71 holds the load signal held by the large throw-in weighing hopper 21. It also functions as a weight calculating means for calculating the weight of the weighing object.

  The instruction controller 72 controls the operation of an actuator (such as the rotary actuators 34 and 35) for opening and closing the loss-in input gate 31 and the loss-in discharge gate 32 as described above. The instruction controller 72 also functions as a weight calculation unit that receives an output signal from the load cell LC8 that supports the loss-in hopper 42 and calculates the weight of an object to be weighed in the loss-in hopper 42 based on the output signal. That is, in the packer scale 100 of the present embodiment, the instruction controller 72 constantly monitors the weight of the object to be weighed in the loss-in hopper 42 using the load cell LC8. Therefore, when the weight of the object to be weighed in the loss-in hopper 42 is reduced by an amount just set from the initial weight before discharge of the object to be measured, the instruction controller 72 causes the discharge port of the loss-in hopper 42 to perform the loss-in discharge. It can be closed using the gate 32. By using loss-in weighing by the small throw-in weighing unit 30, the discharge amount of the object to be weighed can be adjusted with high accuracy.

  As described above, the instruction controller 73 includes the first, second, third, and fourth intermediate charging cut gates 54, 55, 56, and 37, and the first, second, third, and fourth intermediate charging weighing hopper gates 67, The operation of actuators for opening and closing 68, 69, 38 (the rotary actuators 51, 52, 53, 36, 57, 58, 59, 39) is controlled. In addition, the instruction controller 73 outputs output signals from the load cells LC5, LC6, LC7, and LC9 that support the first, second, third, and fourth intermediate charging hoppers 64, 65, 66, and 44, respectively. Receiving and functioning as weight calculation means for calculating the weight of the respective objects to be weighed in the first, second, third and fourth middle input weighing hoppers 64, 65, 66 and 44 based on these output signals. .

  Further, the instruction controller 73 functions as a combination unit that performs combination processing. In this combination processing, the objects to be weighed adjusted at different ratios (details will be described later) of the objects to be weighed are placed in the first, second, third and fourth medium input weighing hoppers 64, 65, 66 and 44. It is performed by being supplied to each of these. That is, in this combination processing, a combination calculation is performed based on the weights of the four objects to be weighed adjusted to the different ratios, and the total weight of the objects to be weighed is closest to the combination target weight (details will be described later). A combination of the first, second, third, and fourth middle input weighing hoppers 64, 65, 66, and 44 is obtained, and the objects to be weighed in the medium input weighing hopper selected as the combination are discharged to the collecting chute.

[Loading operation, weighing operation and discharge operation of the object to be measured by the packer scale]
Hereinafter, an example of an input operation, a measurement operation, and a discharge operation of an object to be weighed (for example, resin pellets) by the packer scale 100 of the present embodiment will be described in detail with reference to the drawings.

  FIG. 6 and FIG. 7 are diagrams illustrating an example of an operation for inputting an object to be weighed, a weighing operation, and a discharging operation by the packer scale according to the embodiment of the present invention. FIG. 6 shows an opening / closing timing chart of valves and gates used in the packer scale 100 of the present embodiment. Further, FIG. 7A shows a timing chart of input and discharge of an object to be weighed by the packer scale of FIG. FIG. 7 (b) shows the change over time of the input (discharge) weight of the object to be weighed by the packer scale of FIG.

  First, as a preparatory work of the weighing object input operation, the weighing operation, and the discharging operation by the packer scale 100 of the present embodiment, the operator inputs the object to be weighed into the weighing hopper body 20 from the supply port 12. At this time, it is assumed that the cone valve 80 used for the packer scale 100 is opened and all the gates used for the packer scale 100 are closed.

  Then, the object to be weighed from the supply port 12 falls toward the lower side of the weighing hopper body 20 due to its own weight, and accumulates in the volume weighing unit 20A of the weighing hopper body 20. When the objects to be weighed in the weighing hopper main body 20 are accumulated up to a predetermined vertical height H (see FIG. 1A, FIG. 3 and FIG. 4), the objects to be weighed are connected to the left and right relay portions 40, 60. Each of them begins to fall by its own weight through these openings 40D and 60D. Then, as shown in FIG. 3, the objects to be weighed from the opening 60D are distributed from the relay unit 60 to the first, second, and third middle branching portions 60A, 60B, 60C at the lower end of the relay unit 60. As a result, the object to be weighed is deposited on each of the first, second and third medium charging chutes 61, 62 and 63. Further, as shown in FIG. 4, the objects to be weighed from the opening 40D are distributed at the lower end of the relay unit 40 from the relay unit 40 to the fourth middle input branch unit 40B and the small input branch unit 40A and fall down by their own weight. As a result, the objects to be weighed are deposited on the fourth medium charging chute 43 and the loss-in charging chute 41, respectively. Finally, the objects to be weighed may be introduced from the supply port 12 so that the objects to be weighed are filled in the weighing hopper main body 20 and the relay units 40 and 60, respectively.

  When the preparatory work for the weighing object, the weighing operation, and the discharging operation is completed, an operation start button (not shown) of the packer scale 100 is pressed, whereby the instruction controllers 71, 72, 73 (hereinafter, referred to as “instruction controllers”). (Hereinafter simply referred to as “controller”), based on a control program for executing the operation of each part of the packer scale 100, the following operation is executed while controlling each part of the packer scale 100.

  First, in the large throw-in weighing unit 10 in FIG. 6, the controller closes the cone valve 80 and opens the large throw cut gates 15A and 15B. That is, the cone valve 80 and the large input cut gates 15A and 15B are moved so as to close the input port of the object to be weighed in the volume measuring unit 20A and open the discharge port of the object to be measured in the volume measuring unit 20A. Then, as shown in FIGS. 7A and 7B, the object to be weighed in the weighing hopper main body 20 is charged (supplied) into the large throw-in weighing hopper 21.

  At this time, by volume measurement of the object to be weighed using the volume measuring unit 20A, the volume input weight MB of the object to be weighed into the large input weighing hopper 21 is calculated based on the bulk density of the object to be weighed. The weight can be adjusted to be slightly lower than MT (for example, about 98% of the target weight MT). That is, in the packer scale 100 of the present embodiment, an appropriate amount (volume input weight MB) less than the target weight MT can be supplied to the large input weighing hopper 21 using volume measurement. When the metering stabilization waiting time T1 in the load cells LC1, LC2, LC3, and LC4 elapses, the controller can calculate the volume input weight MB based on the output signals from the load cells LC1, LC2, LC3, and LC4. Thereby, the controller can calculate an insufficient weight of the target weight MT (target weight MT−volume input weight MB), and as a result, the loss-in discharge weight MR of the object to be weighed from the loss-in hopper 42 (see FIG. 7B). And the optimum combination of the first, second, third, and fourth medium throw-in weighing hoppers 64, 65, 66, 44 can be selected.

  Further, as shown in FIG. 6, the controller closes the large input cut gates 15A and 15B and opens the cone valve 80 at an appropriate time during the measurement stabilization waiting time T1. That is, the cone valve 80 and the large input cut gates 15A and 15B move so that the input port of the object to be weighed in the volume measuring unit 20A is opened and the discharge port of the object to be measured in the volume measuring unit 20A is closed. Then, the object to be weighed is filled in the volume measuring unit 20A. At this time, the object to be weighed is volume-measured using the volume weighing unit 20A. At the same time, the controller drives the air vibrator 90, and vibration is applied to the wall portion of the volume measuring unit 20A using the air vibrator 90.

  Thereafter, as shown in FIG. 6, the controller uses the large throw-in weighing hopper gates 18A and 18B to open the discharge port of the large throw-in weighing hopper 21 in a timely manner, and discharges the object to be weighed from the discharge port to the volume (see FIG. 7). (A) and FIG. 7 (b)).

  Further, in the first middle throwing weighing unit 50A of FIG. 6, the first middle throwing chute 61 is used to open the discharge port of the first middle throwing chute 61 while the volume of the object to be weighed is being performed. To do. Then, the object to be weighed in the first middle throwing chute 61 is thrown into (supplied) into the first middle throwing hopper 64.

  At this time, the controller controls the opening time of the discharge port of the first middle throwing chute 61 so that the weighing weight S1 of the weighing object to the first middle loading weighing hopper 64 is based on the bulk density of the weighing object. To a predetermined specific gravity. When the weighing stabilization waiting time T2 in the load cell LC5 elapses, the controller can calculate the input weight S1 of the object to be weighed based on the output signal from the load cell LC5.

  Thereafter, as shown in FIG. 6, when the controller selects the first medium charging weighing hopper 64 based on the combination calculation, the controller inserts the first medium charging at an appropriate time (for example, immediately after the measurement stabilization waiting time T1 elapses). By using the weighing hopper gate 67, the discharge port of the first middle throw-in weighing hopper 64 can be opened, and the objects to be weighed can be selectively discharged from the discharge port (see FIGS. 7A and 7B).

  Further, in the third middle throwing weighing unit 50C of FIG. 6, the third middle throwing chute 63 is used to open the discharge port of the third middle throwing chute 63 while the volume of the object to be weighed is being performed. To do. Then, the object to be weighed in the third middle throwing chute 63 is middle thrown (supplied) into the third middle throwing weighing hopper 66.

  At this time, the controller controls the opening time of the discharge port of the third middle throwing chute 63, so that the input weight S2 of the weighing object to the third middle throwing weighing hopper 66 is based on the bulk density of the weighing object. To a predetermined specific gravity (for example, twice the input weight S1). In this case, the opening time of the discharge port of the third medium charging chute 63 is longer than the opening time of the discharging port of the first medium charging chute 61 because the charging weight S2 is twice the charging weight S1. When the weighing stabilization waiting time T3 in the load cell LC7 elapses, the controller can calculate the input weight S2 of the object to be weighed based on the output signal from the load cell LC7.

  Thereafter, as shown in FIG. 6, when the controller selects the third medium throw-in weighing hopper 66 based on the combination calculation, the controller inserts the third medium throw-in in a timely manner (for example, immediately after the measurement stabilization waiting time T1 elapses). By using the weighing hopper gate 69, the discharge port of the third middle throw-in weighing hopper 66 can be opened, and the objects to be weighed can be selectively discharged from the discharge port (see FIGS. 7A and 7B).

  Further, in the second middle throwing weighing unit 50B of FIG. 6, the second middle throwing chute 62 is used to open the discharge port of the second middle throwing chute 62 while the volume of the object to be weighed is being performed. To do. Then, the object to be weighed in the second middle throwing chute 62 is thrown into (supplied) into the second middle throwing weighing hopper 65.

  At this time, the controller controls the opening time of the discharge port of the second middle throwing chute 62, so that the throwing weight S3 of the weighing object to the second middle throwing weighing hopper 65 is based on the bulk density of the weighing object. To a predetermined specific gravity (for example, four times the input weight S1). In this case, since the opening time of the discharge port of the second medium charging chute 62 is four times the charging weight S1, the opening time of the discharge port of the first medium charging chute 61 and the third medium charging chute 63. Longer than the opening time of the outlet. When the weighing stabilization waiting time T3 in the load cell LC6 elapses, the controller can calculate the input weight S2 of the object to be weighed based on the output signal from the load cell LC6.

  Thereafter, as shown in FIG. 6, when the controller selects the second medium throw-in weighing hopper 65 based on the combination calculation, the controller inserts the second medium throw-in in a timely manner (for example, immediately after the measurement stabilization waiting time T1 elapses). By using the weighing hopper gate 68, the discharge port of the second medium charging weighing hopper 65 can be opened, and the objects to be weighed can be selectively discharged from the discharge port (see FIGS. 7A and 7B).

  Further, in the fourth middle throwing-in weighing unit 50D in FIG. 6, the fourth middle throwing chute 43 is used to open the discharge port of the fourth middle throwing chute 43 while the volume of the object to be weighed is being performed. To do. Then, the object to be weighed in the fourth middle throwing chute 43 is middle thrown (supplied) into the fourth middle throwing weighing hopper 44.

  At this time, the controller controls the opening time of the discharge port of the fourth middle throwing chute 43, so that the input weight S4 of the weighing object to the fourth middle throwing weighing hopper 44 is based on the bulk density of the weighing object. To a predetermined specific gravity (for example, 8 times the input weight S1). In this case, since the opening time of the discharge port of the fourth middle charging chute 43 is eight times the charging weight S4, the opening time of the discharging port of the first middle charging chute 61 and the third middle charging chute 63 Longer than the opening time of the outlet. When the weighing stabilization waiting time T5 in the load cell LC7 elapses, the controller can calculate the input weight S4 of the object to be weighed based on the output signal from the load cell LC7.

  Thereafter, as shown in FIG. 6, when the controller selects the fourth medium throw-in weighing hopper 44 based on the combination calculation, the controller inserts the fourth medium throw-in in a timely manner (for example, immediately after the measurement stabilization waiting time T1 elapses). By using the weighing hopper gate 38, the discharge port of the fourth middle charging weighing hopper 44 can be opened, and the objects to be weighed can be selectively discharged from the discharge port (see FIGS. 7A and 7B).

  In addition, in the small input metering unit 30 in FIG. 6, the loss-in input chute 41 is opened using the loss-in input gate 31. Then, the object to be weighed in the loss-in charging chute 41 is loss-in charged (supplied) into the loss-in hopper 42.

  At this time, since the controller monitors the output signal from the load cell LC8 that supports the loss-in hopper 42, the weight of the object to be weighed into the loss-in hopper 42 is equal to the insufficient weight of the object to be weighed (for example, the previous cycle). ), The discharge port of the loss-in input chute 41 can be closed using the loss-in input gate 31. When the weighing stability waiting time T7 in the load cell LC8 in the loss-in charging has elapsed, the controller uses the loss-in discharging gate 32 to open the discharge port of the loss-in hopper 42 in a timely manner (for example, immediately after the weighing stabilization waiting time T1 has elapsed). A small amount (for example, less than the input weight S1) of the object to be weighed is discharged from the discharge port while the loss-in weighing of the object to be weighed is calculated based on the output signal from the load cell LC8. ) And FIG. 7B). When the weighing stabilization waiting time T6 in the load cell LC8 in loss-in discharge elapses, the object to be weighed in the loss-in throwing chute 41 is again thrown in (supplied) into the loss-in hopper 42.

  Such a packer scale 100 of this embodiment can exhibit the following various actions and effects.

  First, in the packer scale 100 of the present embodiment, an appropriate amount of a large amount (for example, 95% or more) of objects to be weighed is input to the large input weighing hopper 21 by using the volume weighing of the objects to be weighed by the volume weighing unit 20A. Volume can be input at once. As a result, the weighing (input) speed of the object to be weighed is improved, and as a result, the time required for one cycle of the object to be weighed, weighed and discharged by the weighing device can be shortened.

  Secondly, the vibration of the wall portion of the volume measuring unit 20A using the air vibrator 90 can suppress the change in the bulk density of the object to be measured in the volume measuring unit 20A, and hence the change in the volume input weight MB can be suppressed. . Further, the air exhaust in the volume measuring unit 20A using the air venting means of the cone valve 80 can suppress the change in the bulk density of the object to be weighed in the volume measuring unit 20A, and consequently suppress the fluctuation of the volume input weight MB. it can.

  Third, the timing of volume input of the object to be weighed into the large input weighing hopper 21, and the object to be weighed into each of the first, second, third and fourth medium input weighing hoppers 64, 65, 66, 44. At least a pair of input timings of the medium input timing and the loss-in input timing of the object to be measured into the loss-in hopper 42 overlap. Specifically, the timing of the volume input of the object to be weighed into the large input weighing hopper 21 and the weighing object to the first, second, third and fourth medium input weighing hoppers 64, 65, 66, 44 respectively. There is an overlap with the timing of the medium insertion.

  In addition, the first, second, third, and fourth middle insertion cut gates 54, 55, 56, and 37 are opened almost simultaneously, and are closed in a timely manner according to the input weights S1, S2, S3, and S4.

  As described above, in the packer scale 100 of this embodiment, the weighing (input) speed of an object to be measured is improved, and as a result, the time of one cycle of input, measurement and discharge by the packer scale 100 can be shortened.

  Fourth, the volume discharge timing of the object to be weighed from the large input weighing hopper 21 and the objects to be weighed from the first, second, third and fourth medium input weighing hoppers 64, 65, 66 and 44, respectively. The combination selective discharge timing and the loss-in discharge timing of the object to be weighed from the loss-in hopper 42 overlap.

  In addition, the first, second, third, and fourth medium input weighing hopper gates 67, 68, 69, and 38 and the loss-in discharge gate 32 are opened almost simultaneously, and the first, second, third, and fourth medium input weighings are opened. The hopper gates 67, 68, 69 and 38 are closed almost simultaneously.

  As described above, in the packer scale 100 of this embodiment, the weighing (discharging) speed of the object to be weighed is improved, and as a result, the time for one cycle of loading, weighing and discharging of the object to be weighed by the packer scale 100 can be shortened.

  Fifth, when the weighing stabilization waiting time T1 in the load cells LC1, LC2, LC3, LC4 has elapsed, the first, second, third, and fourth medium charging hopper gates 67, 68, 69, 38 and the loss-in discharge gate 32 Each of them is open immediately. Further, when closing each of the first, second, third and fourth middle charging hopper gates 67, 68, 69 and 38, the first, second, third and fourth middle charging cut gates 54, 55, Each of 56 and 37 has already begun to open.

  As described above, in the packer scale 100 of the present embodiment, the weighing speed of the object to be weighed is improved, and as a result, the time required for one cycle of loading, weighing and discharging of the object to be weighed by the packer scale 100 can be shortened.

  Sixth, the weights of the objects to be weighed are adjusted at different ratios (in this example, the weights of the input weight S1: the input weight S2: the input weight S3: the input weight S4 = 1: 2: 4: 8). A weighing object is supplied to each of the first, second, third and fourth medium charging weighing hoppers 64, 65, 66, 44. Thereby, the combination calculation based on the weight of each to-be-measured object in the 1st, 2nd, 3rd and 4th throw-in weighing hoppers 64, 65, 66, 44 can be performed.

  Here, when the weighing stability waiting time T1 in the load cells LC1, LC2, LC3, and LC4 elapses after the volume of the object to be weighed into the large throw-in weighing hopper 21 is passed, the controller loads the load cell that supports the large throw-in weighing hopper 21. Volume input weight MB can be calculated based on output signals from LC1, LC2, LC3, and LC4. For this reason, the combination target weight used for the combination calculation can be set based on the target weight MT of the object to be measured, the volume input weight MB of the object to be measured, and the loss-in discharge weight MR of the object to be measured.

  For example, as shown in FIG. 7B, a loss-in discharge weight MR that is convenient for loss-in discharge is determined in advance, and the loss-in discharge weight MR is subtracted from the target weight MT of the object to be measured. The difference from the volume input weight MB of the weighing object may be set as the combination target weight.

  As described above, in the packer scale 100 of the present embodiment, highly accurate loss-in discharge can be used to finally adjust the weight of the object to be measured to the target weight MT. Therefore, the weighing accuracy (cut accuracy) of the object to be weighed can be maintained with high accuracy. Further, in the packer scale 100 of the present embodiment, the total weight of the objects to be weighed in each of the first, second, third, and fourth medium input weighing hoppers 64, 65, 66, 44 is the combined target weight. A combination of the first, second, third, and fourth medium input weighing hoppers 64, 65, 66, and 44 that is closest to is obtained, and the objects to be weighed in the hopper selected for the combination are selectively discharged. Therefore, it is possible to appropriately perform the loss-in discharge of the weighing object for final adjustment of the weight of the weighing object following the combination selection discharge of the weighing object (for example, the loss-in discharge amount can be set to a small amount), and consequently The weighing speed and weighing accuracy (cut accuracy) of the object to be weighed are improved.

  According to the present invention, it is possible to obtain a weighing device in which the weighing speed and weighing accuracy of an object to be weighed are improved as compared with the conventional example. Therefore, the present invention provides a weighing device that adjusts the objects to be weighed of powder (detergent, fertilizer, etc.) and granules (resin pellets, grains, feed, etc.) to a predetermined target weight and fills a container such as a bag. Available.

DESCRIPTION OF SYMBOLS 10 Large throw-in weighing part 11 Upper end part 12 of weighing hopper main body Supply port 13 of weighing hopper main body Air vent part 14 AC servo motor 15A, 15B Large throw-in cut gate 17 Rotary actuator 18A, 18B for large throw-in weighing hopper gate Large throw-in weighing hopper gate 20 Weighing hopper body 20A Volume weighing unit 21 Large input weighing hopper 21A Large input weighing hopper main body 22 Collecting chute 30 Small input weighing unit 31 Loss-in input gate 32 Loss-in discharge gate 34 Rotary actuator for loss-in input gate 35 Rotary for loss-in discharge gate Actuator 36 Rotary actuator 37 for the fourth medium throwing cut gate Fourth medium throwing cut gate 38 Fourth medium throwing hopper gate 39 Rotary actuator 40 for the fourth medium throwing hopper gate Joint portion 40A Small throw branch portion 40B Fourth middle throw branch portion 40D Opening 41 Loss-in throw chute 42 Loss-in hopper 43 Fourth medium throw chute 44 Fourth medium throw weighing hopper 44A Fourth medium throw weighing hopper main body 50 Medium throw weighing portion 50A First middle charging weighing unit 50B Second middle loading weighing unit 50C Third middle loading weighing unit 50D Fourth middle loading weighing unit 51 Rotary actuator 52 for first middle loading cut gate Rotary actuator 53 for second middle loading weighing gate Rotary actuator 54 for the third medium throwing cut gate First medium throwing cut gate 55 Second medium throwing cut gate 56 Third medium throwing cut gate 57 Rotary actuator 58 for the first medium throwing weighing hopper gate For the second medium throwing weighing hopper gate Rotary Actuator 59 3rd Medium Weighing Hopperage Rotary actuator 60 for relay 60A 1st middle throwing branch 60B 2nd middle throwing branch 60C 3rd middle throwing branch 60D Opening 61 1st middle throwing chute 62 2nd middle throwing chute 63 3rd middle throwing chute 64 First medium charging weighing hopper 64A First medium charging weighing hopper main body 65 Second medium charging weighing hopper 65A Second medium charging weighing hopper main body 66 Third medium charging weighing hopper 66A Third medium charging weighing hopper main body 67 First medium charging Weighing hopper gate 68 2nd medium charging weighing hopper gate 69 3rd medium charging weighing hopper gate 70 Rotary encoder 71 Instruction controller 72 for large charging weighing unit control Instruction controller 73 for small charging weighing unit control 73 Instruction for controlling middle charging weighing unit Controller 74 AC servo driver 80 Cone valve 81 Cone valve valve element 82 Cone valve valve seat 83 Valve of the valve shaft 86A, 86B air cylinder (drive device)
87 Connecting member 88 Bearing box 100 Packer scale (metering device)

Claims (8)

A large input weighing hopper for weighing the weighing object and discharging the weighing object after weighing by supplying weighing object less than the target weight of the weighing object;
A cut gate disposed in the weighing hopper body above the large throw-in weighing hopper;
A cone valve disposed in the weighing hopper body above the cut gate;
Each of the objects to be weighed with the weights of the objects to be weighed adjusted at different ratios is supplied to perform a combination calculation based on the weight of the objects to be weighed, and based on the result of the combination calculation, A plurality of medium throw-in weighing hoppers from which items are discharged;
A loss-in hopper that is used for loss-in weighing and from which the object to be weighed is lost in;
With
By closing the cut gate and opening the cone valve, the inside of the weighing hopper body between the cone valve and the cut gate is used as a volume weighing unit, and the volume weighing unit is filled with the object to be weighed. ,
A weighing device in which the cut-in gate is opened and the cone valve is closed, whereby the volume of the object to be weighed in the volume weighing unit is loaded into the large throw-in weighing hopper.   The weighing device according to claim 1, wherein a vibrator is disposed on a wall portion of the volume weighing unit.   The measuring device according to claim 1, wherein the cone valve includes an air venting unit capable of guiding the air in the volume measuring unit to the outside. At least a pair of inputs among the input timing of the object to be weighed into the large input weigh hopper, the input timing of the object to be weighed into the medium input weigh hopper, and the input timing of the object to be weighed into the loss-in hopper timing are overlapped, the metering device according to claim 1. The weighing device according to claim 4 , wherein an input timing of the object to be weighed into the large throw-in weighing hopper and an input timing of the object to be weighed into the medium throw-in weighing hopper overlap. The discharge timing of the object to be weighed from the large input weighing hopper, the discharge timing of the object to be weighed from the medium input weighing hopper, and the discharge timing of the object to be weighed from the loss-in hopper overlap. The weighing device according to claim 1 . In the combination computation, the sum of the weights of the objects to be weighed in said charged weighing hopper is combined in said projection entry weighing hoppers closest to a predetermined combination target weight is determined, the now selected the combination the objects to be weighed projecting input weighing hopper are discharged, the weighing apparatus according to claim 1. The combination target weight is the target weight of the objects to be weighed, said the weight of the objects to be weighed DIS input weighing hopper, said the weight of Los Inn the objects to be weighed by the discharge, on the basis of being set, The weighing device according to claim 7 .

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