JP5839444B2 - 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 using timer filling by controlling the opening time of a cut gate is known (see Patent Documents 1 and 2).

  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 3, 4, and 5).

  There has also been proposed an apparatus intended to increase the speed and accuracy of weighing objects to be weighed by introducing the volume of the objects to be weighed into the hopper and replenishing and charging by loss-in discharge (see Patent Document 6).

JP 60-82818 A Japanese Patent Laid-Open No. 62-119413 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. In the course of this development, the mere design change of the existing equipment exemplified in Patent Documents 1 to 6 has a certain limit in improving the performance of the apparatus considering both high-speed and high-precision weighing of the objects to be weighed. It has gradually become clear. And it came to the conclusion that the fundamental review of the structure of the conventional example is indispensable for the remarkable improvement of the performance of the packer scale (high-speed and high-precision 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, an aspect of the present invention is configured such that an object to be weighed less than a target weight of the object to be weighed is supplied by a volume input weight, whereby the object to be weighed is weighed. The weight of the object to be weighed is supplied by supplying a large input weighing hopper for discharging the object to be weighed after weighing and an object to be weighed in which the weight of the object to be weighed is adjusted with a different specific gravity. Based on the result of the combination calculation, a plurality of medium input weighing hoppers to which the objects to be weighed are discharged, and objects to be weighed for a small input discharge weight that is lighter than the volume input weight are discharged. In the combination calculation, the combination of the intermediate input weighing hoppers in which the total weight of the objects to be weighed in the intermediate input weighing hopper is closest to a predetermined combination target weight is obtained. The weighing object in the intermediate input weighing hopper selected for the combination is selected and discharged in combination, and the weighing speed and weighing accuracy of the weighing object are the volume input weight, the combination target weight, The weight input weight of the object to be weighed adjusted by the large input weighing hopper during the operation of the weighing device and the object to be weighed measured by the medium input weighing hopper. The weight of the object to be measured whose weight value to be measured is not predetermined, and the small input / output weight of the object measured by the small input weighing hopper is the weight of the object to be weighed by the measuring device. Provided is a weighing device in which a weight value to be measured is a predetermined weight of an object to be measured for each cycle of charging, weighing, and discharging.

  Further, in the weighing device according to one aspect of the present invention, the small input weighing hopper is used for loss-in weighing, and the object to be weighed is a loss-in hopper for loss-in discharge corresponding to the loss-in discharge weight as the small input discharge weight. May be.

  With this configuration, the capacity and accuracy of the weighing device can be adjusted appropriately.

  As described above, in this specification, the “volume input weight” of an object to be weighed by a large input weighing hopper refers to a method of inserting an object to be weighed (for example, during operation of the weighing device (for example, In the embodiment, based on the example of timer filling using a cut gate), it refers to the weight of an object to be supplied (input) to a large input weighing hopper, and the weight value to be measured is determined in advance. It does not mean the weight of the sample.

  In addition, the weight of the object to be weighed by the medium throw-in weighing hopper refers to a method of loading any object to be weighed during operation of the weighing device (for example, in the embodiment, timer filling using a cut gate is used). Refers to the weight based on a predetermined combination of objects to be supplied (input) to the medium input weighing hopper, based on the weight of the object to be measured. I don't mean.

  On the other hand, the “small input / output weight” of the object to be weighed by the small input weighing hopper is the “target weight” of the object to be measured, the “volume input weight”, and the above The weight of the object to be weighed by the intermediate input weighing hopper refers to the weight of the object to be weighed determined for each cycle of loading, weighing and discharging of the object to be weighed by the weighing device. In other words, the “small input / output weight” means the weight of an object to be measured in which a weight value to be measured is predetermined for each cycle of input, measurement and discharge of the object to be measured by the measuring device.

  As described above, the weighing device of the present invention has a weight for which the weight value to be measured is not determined in advance (“volume input weight” and the weight of the object to be weighed measured by the medium input weighing hopper) and the weight to be measured. There is a characteristic that a value is mixed with a predetermined weight for each cycle (“small input / output weight”).

  Further, in the weighing device according to one aspect of the present invention, the reduced amount obtained by reducing the volume input weight may be compensated by increasing the combination target weight.

  With this configuration, the weighing speed of the object to be weighed can be improved.

  In the weighing device according to one aspect of the present invention, the reduced amount obtained by reducing the small input / output weight may be compensated by increasing the combination target weight.

  With this configuration, the weighing amount of the small input weighing hopper can be set to a small amount, so that the weighing speed and weighing accuracy of the object to be weighed can be improved.

  In addition, according to an embodiment of the present invention, an object to be weighed that is less than a target weight of the object to be weighed is supplied by a volume input weight, whereby the object to be weighed is weighed and the object to be weighed after weighing is measured. Is supplied with a large input weighing hopper that is discharged, and an object to be weighed in which the weight of the object to be weighed is adjusted with a different specific gravity, whereby a combination calculation based on the weight of the object to be weighed is performed, A plurality of medium input weighing hoppers to which the objects to be weighed are discharged based on the result of the combination operation, a small input weighing hopper to discharge objects to be weighed for a small input and discharge weight lighter than the volume input weight, A controller capable of receiving an output signal output from the detection means, wherein the controller correlates with the weighing speed or the weighing accuracy of the object to be weighed based on the output signal. Self It can lead to monitoring items for diagnosis and self-reset, to provide a metering device.

  Further, in the weighing device according to one aspect of the present invention, the small input weighing hopper is used for loss-in weighing, and the object to be weighed is a loss-in hopper for loss-in discharge corresponding to the loss-in discharge weight as the small input discharge weight. May be.

  With this configuration, it is possible to construct a control system for the weighing device by optimal control of the controller using various self-diagnosis and self-recovery monitoring items of the weighing device.

  A weighing device according to an aspect of the present invention includes an adjuster that adjusts the flow rate of an object to be weighed into a medium throw-in weighing hopper, and the controller determines whether the monitoring item of the weighing device is within an optimum range. If the monitoring item of the weighing device is determined to be outside the optimum range, the adjuster may be controlled so that the weighing device returns to a normal state.

  In the weighing device according to an aspect of the present invention, the controller causes the display to display a determination result as to whether or not the monitoring item of the weighing device is within an optimum range, and the monitoring of the weighing device. After determining that the item exists outside the optimum range, it may be displayed on the display device that the weighing device has returned to a normal state under the control of the adjuster.

  With this configuration, the operator can visually recognize that the monitoring item of the weighing device has approached the boundary of the optimum range, or that this has entered the outside of the optimum range. As a result, the weighing device is in an abnormal state. You can detect the possibility of falling. In addition, the operator can visually recognize that the weighing device has returned to the normal state.

  Further, in the weighing device according to an aspect of the present invention, the controller controls an operation rate of the middle input weighing unit as the monitoring item so as to keep the small input / output weight as the monitoring item at a predetermined amount. May be.

  With this configuration, it is possible to maintain the weighing speed and weighing accuracy of the object to be measured at desired values, respectively.

  Further, in the weighing device according to one aspect of the present invention, the controller is configured to monitor the intermediate item as the monitoring item so as to maintain a predetermined number of objects to be weighed per unit time by the weighing device as the monitoring item. The operating rate of the input weighing unit may be controlled.

  With this configuration, the weighing speed of the object to be weighed can be maintained at a desired value.

  In the weighing device according to one aspect of the present invention, the weighing object is put into the large throw-in weighing hopper and the weighing object is thrown into the medium throw-in weighing hopper at the same time, and The discharge of the object to be weighed from the input weighing hopper and the discharge of the object to be weighed from the medium input weighing hopper may be performed simultaneously.

  With this configuration, the weighing speed of the object to be weighed can be improved.

  Moreover, in the weighing device according to one aspect of the present invention, a plurality of large throw-in weighing hoppers may be provided.

  With this configuration, the measuring speed of the measuring device can be improved.

  Further, in the weighing device according to one aspect of the present invention, a plurality of small input weighing hoppers may be provided.

  With this configuration, the weighing accuracy of the weighing device can be improved.

  In addition, according to an embodiment of the present invention, an object to be weighed that is less than a target weight of the object to be weighed is supplied by a volume input weight, whereby the object to be weighed is weighed and the object to be weighed after weighing is measured. Is supplied with a large input weighing hopper that is discharged, and an object to be weighed in which the weight of the object to be weighed is adjusted with a different specific gravity, whereby a combination calculation based on the weight of the object to be weighed is performed, A plurality of medium input weighing hoppers to which the objects to be weighed are discharged based on the result of the combination operation, a small input weighing hopper to discharge objects to be weighed for a small input and discharge weight lighter than the volume input weight, In the combination calculation, a combination of the intermediate charging weighing hoppers in which the total weight of the objects to be weighed in the intermediate charging weighing hopper is closest to a predetermined combination target weight is obtained and selected as the combination. The objects to be weighed in the intermediate input weighing hopper are selected and discharged in combination, and the small input discharge weight and the combination target weight are the target weight of the object to be measured, the volume input weight, and the predicted variation in the volume input weight. A weighing device is provided which is set based on the quantity and the hopper state of the weighing device.

  Further, in the weighing device according to one aspect of the present invention, the small input weighing hopper is used for loss-in weighing, and the object to be weighed is a loss-in hopper for loss-in discharge corresponding to the loss-in discharge weight as the small input discharge weight. May be.

  With this configuration, in the weighing device according to an aspect of the present invention, the small input discharge weight is reduced by discharging with the small input weighing hopper (in other words, the discharge accuracy is increased and the discharge is reduced by reducing the weight of the small input weighing hopper). Time reduction) can be appropriately performed by controlling the hopper state of the weighing device. Therefore, the weighing device of a certain form of the present invention improves the weighing speed and weighing accuracy of the object to be weighed compared to the conventional example.

  Here, the hopper state of the weighing device may be changed using the number of hoppers of the medium throw-in weighing hopper.

  In the weighing device according to an aspect of the present invention, the small input / output weight and the combination target weight are calculated by adding the small input / output weight to the medium input weighing hopper having the smallest specific gravity. You may set so that it may become equal.

  In the weighing device according to an aspect of the present invention, the small input / output weight may be set to zero when the small input / output weight is within an allowable weight range of a target weight of the object to be weighed.

  Even in such a configuration, the weighing accuracy of the object to be weighed can be maintained with high accuracy. Further, since it is not necessary to discharge from the small input weighing hopper, the weighing speed of the object to be weighed can be further improved.

  In the weighing device according to one aspect of the present invention, when the small input / output weight exceeds a predetermined threshold weight, the number of hoppers of the medium input weighing hopper is increased, and the small input / output weight and the combination target weight are re-established. It may be set.

  With this configuration, for example, when one medium input weighing hopper that maximizes the specific gravity of an object to be weighed is added, the small input discharge weight can be set to a smaller amount (that is, the small input weighing hopper can be reduced in weight). ).

  Further, according to one aspect of the present invention, an object to be weighed that is less than a target weight of the object to be weighed is supplied by a volume input weight, so that the object to be weighed is weighed using a load detector, Based on the weight of the object to be weighed by supplying a large input weighing hopper from which the object to be weighed after the weighing is discharged and an object to be weighed in which the weight of the object to be weighed is adjusted with a different specific gravity. A plurality of medium input weighing hoppers that discharge the objects to be weighed based on the result of the combination operation, and objects to be weighed for a small input discharge weight that is lighter than the volume input weight. A small input weighing hopper, an adjuster for adjusting the flow rate of an object to be weighed into the medium input weighing hopper, and a controller capable of receiving a load signal output from the load detector, The controller Using the load signal, the variation in the volume input weight due to the change in the physical property value of the object to be weighed is monitored, and when the variation amount in the volume input weight exceeds a predetermined amount, the variation amount becomes the predetermined amount. A metering device is provided for controlling the regulator to enter.

  Further, in the weighing device according to one aspect of the present invention, the small input weighing hopper is used for loss-in weighing, and the object to be weighed is a loss-in hopper for loss-in discharge corresponding to the loss-in discharge weight as the small input discharge weight. May be.

  With this configuration, in the weighing device according to one aspect of the present invention, the amount of variation in the volume input weight of the large input weighing hopper due to the change in the physical property value of the object to be measured is maintained while the measurement speed of the object to be measured is kept constant. It can be appropriately offset by adjusting the flow rate of the object to be weighed into the input weighing hopper.

  Moreover, in the weighing device according to a certain aspect of the present invention, when the adjuster includes a cut gate above the medium throw-in weighing hopper, the controller may control the opening of the cut gate.

  In addition, according to an embodiment of the present invention, an object to be weighed that is less than a target weight of the object to be weighed is supplied by a volume input weight, whereby the object to be weighed is weighed and the object to be weighed after weighing is measured. Is supplied with a large input weighing hopper that is discharged, and an object to be weighed in which the weight of the object to be weighed is adjusted with a different specific gravity, whereby a combination calculation based on the weight of the object to be weighed is performed, A plurality of medium input weighing hoppers to which the objects to be weighed are discharged based on the result of the combination operation, a small input weighing hopper to discharge objects to be weighed for a small input and discharge weight lighter than the volume input weight, An adjuster that adjusts the flow rate of an object to be weighed into the intermediate input weighing hopper, and a controller that can receive a load signal output from a load detector used for weighing the small input weighing hopper, Said The controller monitors the variation of the small input / output weight due to the change in the physical property value of the object to be measured using the load signal, and if the variation of the small input / exhaust weight exceeds a predetermined amount, A metering device is provided for controlling the regulator so that a quantity falls within the predetermined quantity.

  In the weighing device according to an aspect of the present invention, the small input weighing hopper is used for loss-in weighing, and the object to be weighed may be a loss-in discharge weight corresponding to a loss-in discharge weight as the small input discharge weight. Good.

  With this configuration, the variation in the small input / discharge weight (target amount) of the small input weighing hopper due to the change in the physical property value of the object to be weighed can be applied to the medium input weighing hopper while the measurement speed of the object to be measured is kept constant. It can be adjusted appropriately by adjusting the flow rate of the object to be weighed.

  Moreover, in the weighing device according to a certain aspect of the present invention, when the adjuster includes a cut gate above the medium throw-in weighing hopper, the controller may control the opening of the cut gate.

In addition, according to an embodiment of the present invention, an object to be weighed that is less than a target weight of the object to be weighed is supplied by a volume input weight, whereby the object to be weighed is weighed and the object to be weighed after weighing is measured. Is supplied with a large input weighing hopper that is discharged, and an object to be weighed in which the weight of the object to be weighed is adjusted with a different specific gravity, whereby a combination calculation based on the weight of the object to be weighed is performed, A plurality of medium throwing weighing hoppers that discharge the objects to be weighed based on the result of the combination calculation, wherein in the combination calculation, the weight of the objects to be weighed in the medium throwing weighing hopper A combination of the intermediate charging weighing hoppers whose sum is closest to a predetermined combination target weight is obtained, and the objects to be weighed in the intermediate charging weighing hopper selected for the combination are selectively discharged.
When a small input / discharge weight lighter than the volume input weight is discharged using a small input weighing hopper, the small input / discharge weight and the combined target weight are the target weight of the object to be weighed and the volume input weight. Based on the predicted variation amount of the volume input weight and the hopper state of the weighing device, the input weight of the object to be weighed into the medium input weighing hopper with the smallest specific gravity is equal to the small input discharge weight. When the small input / output weight is within the allowable weight range of the target weight of the object to be weighed, a measuring device is provided in which the small input weighing hopper is not incorporated.

  With this configuration, the weighing device can be designed without incorporating the small input weighing hopper into the weighing device. Thereby, the number of parts of a measuring device can be reduced and a measuring device can be comprised simply.

  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 open / close timing chart of each gate 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. FIG. 8 is a flowchart showing an example of the specification design of the packer scale according to the embodiment of the present invention. FIG. 9 is a flowchart showing another specification design example of the packer scale according to the embodiment of the present invention. FIG. 10 is a flowchart showing an example of variation control of the weight input weight of the object to be weighed into the large input weighing hopper by the packer scale according to the embodiment of the present invention. FIG. 11 is a flowchart illustrating an example of variation control of the loss-in discharge weight of the object to be weighed from the loss-in hopper by the packer scale according to the embodiment of the present invention.

  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. 1B, 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.

  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.

  Further, as shown in FIG. 2B, a pair of mesh-like air vents 13 is provided at the front corner of the upper end 11 of the weighing hopper body 20. 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), as shown in FIG. It can be closed using the cut gates 15A and 15B.

  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.

  In this way, the discharge port of the weighing hopper main body 20 is opened using the large throw cut gates 15A and 15B, whereby a predetermined amount of the weighing object in the weighing hopper main body 20 is placed in the large throw weighing hopper 21. To be supplied. As shown in FIG. 5, the driving of the AC servomotor 14 is controlled by the instruction controller 71 using an AC servo driver 74.

  As shown in FIG. 1, the large input weighing hopper 21 temporarily holds the objects to be weighed supplied from the weighing hopper main body 20 and discharges the objects to be weighed to the collecting chute 22 arranged therebelow. 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 determines the weight of the object to be weighed in the large throw-in weighing hopper body 21A based on the load signals output from the load cells LC1, LC2, LC3, and LC4. Can be weighed. 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 load signal output 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 load signal output 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 load signal output 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 input weighing hopper 66 is opened by the third medium input measurement 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 this embodiment, the instruction controller 73 can measure the weight of the object to be weighed in the fourth medium throw-in weighing hopper main body 44A based on the load signal output 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 body 44A is lost-in discharged based on the load signal output 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 and various message display units, and a key input unit (not shown) through which an operator can input various data. it can.

  Moreover, 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. The instruction controller 71 receives load signals output from the load cells LC1, LC2, LC3, and LC4 that support the large throw-in weighing hopper 21, and is held by the large throw-in weighing hopper 21 based on the load signal. It also functions as a weight calculation means for calculating the weight of the object to be weighed.

  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 a load signal output 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 load 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 is a load that is output from each of 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. As a weight calculation means for receiving signals and calculating the weights of the respective objects to be weighed in the first, second, third and fourth middle input weighing hoppers 64, 65, 66, 44 based on these load signals. Function.

  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 open / close timing chart of each gate 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, 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 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”). May be simply abbreviated as “controller”), but the following operations are executed while controlling each part of the packer scale 100 based on a control program for executing the operations of each part of the packer scale 100.

  First, in the large throw-in weighing unit 10 in FIG. 6, the large throw-in cut gates 15A and 15B move so as to open the discharge port of the weighing hopper main body 20. 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, the controller controls the opening amount of the large input cut gates 15A and 15B and the opening time of the discharge port of the weighing hopper main body 20, thereby determining the volume input weight MB of the object to be weighed into the large input weighing hopper 21. Based on the bulk density of the object to be weighed, the weight can be adjusted to an appropriate amount lower than the target weight MT of the object to be weighed (for example, about 60% to 95% of the target weight MT). A guideline for determining the volume input weight MB will be described later. That is, in the packer scale 100 of the present embodiment, the controller uses the large input cut gates 15A and 15B directly above the large input weighing hopper 21 to give the large input weighing hopper 21 an appropriate amount (volume) less than the target weight MT. An object to be weighed with an input weight MB) can be supplied by timer filling. When the weighing stabilization waiting time T1 in the load cells LC1, LC2, LC3, and LC4 elapses, the controller calculates the volume input weight MB based on the load signals output from the load cells LC1, LC2, LC3, and LC4. it can. As a result, 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 and the first, second, and second weights. The combination target weight (see FIG. 7 (b)) at the third and fourth medium input weighing hoppers 64, 65, 66, 44 is determined, and the first, second, third and fourth medium input weighing hoppers 64, The optimal combination at 65, 66, 44 can be selected. A guideline for determining the loss-in discharge weight MR of the object to be weighed from the loss-in hopper 42 and the combination target weights in the first, second, third and fourth medium input weighing hoppers 64, 65, 66, 44 will be described later. .

  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 load signal output 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 load signal output 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 load signal output 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 load signal output 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 load signal output 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 (for example, the previous time). ), 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, about the above input weight S1) of the object to be weighed is discharged from the discharge port while performing the calculation of the loss-in weighing of the object to be measured based on the load signal output from the load cell LC8 (FIG. 7). (A) and FIG. 7 (b)). 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, the timing of volume input (timer filling) of the object to be weighed into the large input weigh hopper 21, the first, second, third and fourth medium input weigh hoppers 64, 65, 66, 44 respectively At least one pair of input timings of the timing of medium input of the objects to be measured and the timing of loss-in input of the objects to be measured into the loss-in hopper 42 overlap. Specifically, the timing of the volume input (timer filling) of the object to be weighed into the large input weighing hopper 21 and the first, second, third and fourth medium input weighing hoppers 64, 65, 66, 44 to each of them. There is an overlap between the input timing of the objects to be weighed.

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

  In this example, the volume 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 and 44 are used. Is being performed at the same time.

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

  Second, 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.

  Also, the first, second, third and fourth medium charging weigh hopper gates 67, 68, 69, 38 and the loss-in discharge gate 32 are simultaneously opened, and the first, second, third and fourth medium charging weighing hopper gates are opened simultaneously. 67, 68, 69, and 38 are closed simultaneously.

  In this example, the volume 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, 44 are shown. Are selected and discharged at the same time.

  In this example, the loss-in discharge of the objects to be weighed from the loss-in hopper 42 is performed simultaneously with the volume discharge of the objects to be weighed and the combination discharge of the objects to be weighed. Alternatively, the loss-in discharge gate 32 may be opened earlier than the start of discharge of the combination selection discharge of the objects to be weighed. If the timing of opening the loss-in discharge gate 32 is advanced, the weighing speed of the object to be weighed can be improved.

  As described above, in the packer scale 100 of the present embodiment, the weighing (discharging) speed of the object to be weighed can be 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.

  Thirdly, an appropriate amount (for example, about 60% to 95% of the target weight MT) of an object to be weighed can be obtained by using the timer filling of the object to be weighed by the large input cut gates 15A and 15B of the large input weighing unit 10. The volume can be charged into the large charging weighing hopper 21 at once.

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

  Fourth, 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.

  Fifth, the weights of the objects to be weighed are adjusted at different ratios (in this case, input weight S1: input weight S2: input weight S3: input weight S4 = 1: 2: 4: 8, for example). 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. The volume input weight MB can be calculated based on the load signal output from each of 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.

  Note that the “volume input weight MB” of an object to be weighed by the large input weighing hopper 21 is a method for inputting an object to be weighed during operation of the packer scale 100 (here, the large input cut gate 15A). , 15B is used to indicate the weight of an object to be weighed (supplied) to the large input weighing hopper 21, and the weight value to be measured is determined in advance. Does not mean that.

  Further, the weight of the object to be weighed by the first, second, third, and fourth medium input weighing hoppers 64, 65, 66, 44 is any object to be weighed during the operation of the packer scale 100. Based on the first charging method (here, the timer filling using the first, second, third and fourth middle cutting gates 54, 55, 56, 37 is illustrated), the first, second, third and This means the weight based on a predetermined combination of objects to be weighed (input) to the fourth medium weighing weighers 64, 65, 66, 44, and the weight of the object to be measured whose weight value to be measured is predetermined. Does not mean that.

  On the other hand, the “loss-in discharge weight MR” of the object to be weighed by the loss-in hopper 42 means that the “target weight MT” of the object to be weighed, the “volume input weight MB”, and the One cycle of loading, weighing, and discharging of an object to be weighed by the packer scale 100 depending on the weight of the object to be weighed by the first, second, third, and fourth middle weighing hoppers 64, 65, 66, 44 Refers to the weight of the object to be weighed determined every time. That is, the “loss-in discharge weight MR” means the weight of the object to be measured whose weight value to be measured is predetermined for each cycle of input, measurement and discharge of the object to be measured by the packer scale 100.

  As described above, the packer scale 100 according to the present embodiment has a weight for which the weight value to be measured is not determined in advance (“volume input weight MB”, and the first, second, third, and fourth medium input weighing hoppers 64. , 65, 66, and 44), and a weight value to be measured that is predetermined for each cycle ("loss-in discharge weight MR") is mixed. There is.

  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-off 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 object to be weighed for final adjustment of the weight of the object to be measured following the combination selection discharge of the object to be weighed (that is, the weighing of the loss-in hopper 42 can be set to a small amount), As a result, the measurement speed and measurement accuracy (cut-off accuracy) of the object to be measured are improved.

  Further, in the packer scale 100 of this embodiment, these weights are distributed to desired amounts so that the total amount of the volume input weight MB, the combination target weight, and the loss-in discharge weight MR is controlled to be equal to the target weight MT. Therefore, the weighing speed and the weighing accuracy of the object to be weighed are appropriately adjusted by the volume input weight MB, the combination target weight, and the loss-in discharge weight MR. That is, the packer scale 100 can be appropriately designed in terms of the weighing speed and weighing accuracy of the object to be weighed.

  For example, the weight of the loss-in hopper 42 can be set to a small amount by reducing the loss-in discharge weight MR. In this case, in the packer scale 100 of this embodiment, the reduced amount obtained by reducing the loss-in discharge weight MR can be easily compensated by increasing the combination target weight.

  As described above, the packer scale 100 of the present embodiment can improve the weighing speed and weighing accuracy of the object to be weighed. A specific example will be described in a specification design example of the packer scale 100 described later.

  Further, the present inventors consider that the volume input weight MB somewhat affects the weighing speed of the object to be weighed. In this case, in the packer scale 100 of this embodiment, the reduced amount obtained by reducing the volume input weight MB can be easily compensated by increasing the combination target weight.

  As described above, the packer scale 100 of the present embodiment can improve the weighing speed of the object to be weighed. A specific example will be described in a specification design example of the packer scale 100 described later.

[Packer scale specification design example]
Next, a specification design example of the packer scale 100 of the present embodiment will be described in detail with reference to the drawings.

  FIG. 8 is a flowchart showing an example of the specification design of the packer scale according to the embodiment of the present invention.

  The specification of the packer scale 100 can be designed as follows by desktop calculation.

  First, the target weight MT of the object to be weighed is determined (step S801), and the volume input weight MB of the object to be weighed into the large input weighing hopper 21 is determined (step S802). For example, when the target weight MT of the object to be weighed is 25 kg, when 97% of the target weight MT is allocated to the volume input weight MB, the volume input weight MB can be derived as 24.250 kg.

  Next, the variation amount ΔMB of the volume input weight MB is predicted empirically (step S803). For example, the predicted variation amount ΔMB of the volume input weight MB can be known from the physical properties (bulk density, fluidity, adhesion, etc.) of the object to be weighed and the configuration of the apparatus. Here, for the sake of convenience, it is assumed that ± ΔMB = ± 100 g.

  Next, the weight of the object to be assigned to the combination target weight in the medium throw-in weighing hopper and the loss-in discharge weight MR due to the loss-in discharge is specified (step S804). In this case, it is necessary to specify the total of the combination target weight and the loss-in discharge weight MR so that the total discharge weight of the objects to be weighed does not fall below the target weight MT and the yield of the objects to be weighed is minimized. . In this example, this value is (MT−MB) + ΔMB = (25 kg−24.250 kg) +100 g = 850 g.

  The ratios of the input weights S1, S2, S3, S4 of the objects to be weighed into the intermediate input weighing hoppers (here, the first, second, third and fourth intermediate input weighing hoppers 64, 65, 66, 44) The combination target weight and the loss-in discharge weight MR are provisionally set using the weight (step S805). Specifically, the loss-in discharge weight MR and the combination target weight may be set so that the input weight of the object to be weighed into the medium input weighing hopper with the smallest specific gravity is equal to the loss-in discharge weight MR.

  In this example, the ratio weights of the input weights S1, S2, S3, and S4 of the first, second, third, and fourth medium input weighing hoppers 64, 65, 66, and 44 are 1: 2: 4: 8, Loss-in discharge weight MR = input weight S1 = 850 / (1 + 2 + 4 + 8 + 1) = 53.125 g. In this case, the combination target weight is 850 g−53.125 g = 796.875 g.

  In order to improve the weighing speed and weighing accuracy of the object to be weighed compared to the above example, as described above, the loss-in discharge weight MR (= 53.125 g) is reduced so that the weighing of the loss-in hopper 42 can be reduced. It is better to compensate for the weight loss by increasing the combination target weight. Further, in order to improve the weighing speed of the object to be weighed as compared with the above example, as described above, the volume input weight MB (= 24.250 kg) is reduced and the reduced amount is compensated by increasing the combination target weight. Good.

  Next, it is determined whether or not the loss-in discharge weight MR is within an allowable weight range of the target weight MT of the object to be weighed (step S806). Here, for the sake of convenience, the allowable weight range is assumed to be 5 g or less.

  Here, assuming that there are eight medium throw-in weighing hoppers, and the specific gravity of these medium throw-in weighing hoppers is 1: 2: 4: 8: 16: 32: 64: 128, the above loss-in The discharge weight is led to 3.3 g. Then, in step S806, the loss-in discharge weight MR (= 3.3 g) can be determined to be within the allowable weight range (5 g or less) of the target weight MT of the object to be weighed (“Yes” in step S806). In this case, the input weight (= 3.3 g) of the object to be weighed into the medium input weighing hopper having the smallest specific gravity is inevitably within the allowable weight range (5 g or less) of the target weight MT of the object to be weighed. Therefore, the loss-in discharge weight MR should be set to zero (loss-in discharge weight MR = 0) (step S807).

  That is, in the operation of the packer scale 100, the loss-in discharge weight MR is set to zero, the combination target weight is set to (MT−MB) + ΔMB (= 850 g), and the combination calculation of the objects to be weighed using the medium input weighing hopper is performed. Even if the object to be weighed is discharged only from the selected medium throw-in weighing hopper and large throw-in weighing hopper 21, the weighing accuracy of the object to be weighed can be maintained at a desired accuracy. As a result, the object to be weighed with the target weight MT can be appropriately discharged by only volume discharge and combination selective discharge without performing loss-in discharge, so that the weighing speed and weighing accuracy of the object to be weighed can be improved.

  In this case, since the loss-in discharge weight MR is set to zero, the packer scale can be designed without incorporating the small input weighing unit 30 (such as the loss-in input chute 41 and the loss-in hopper 42) into the packer scale, The packer scale can also be designed by incorporating the small input weighing unit 30 into the packer scale.

  When incorporating the small input weighing unit 30 in the packer scale, it may be convenient because the small input weighing unit 30 can be used as necessary.

  When the small input weighing unit 30 is not incorporated in the packer scale, the packer scale can be simply configured by reducing the number of parts of the packer scale.

  On the other hand, in this example, as described above, in step S806, it is determined that the loss-in discharge weight MR (= 53.125 g) is outside the allowable weight range of the target weight MT of the object to be weighed (“No” in step S806). . In this case, the process proceeds to the next determination step, and it is determined whether or not the loss-in discharge weight MR (= 53.125 g) is not more than a predetermined threshold weight outside the allowable weight range of the target weight MT of the object to be weighed ( Step S808). The threshold weight may be set to an appropriate value that can appropriately maintain the weighing speed of the object to be weighed based on the physical property values of the object to be weighed (for example, bulk density, fluidity, adhesion, etc.).

  When the loss-in discharge weight MR is equal to or smaller than the threshold weight (in the case of “YES” in step S808), the combination target weight and the loss-in discharge weight MR in step S805 are respectively set (step S809).

  That is, in this example, in the operation of the packer scale 100, the loss-in discharge weight MR is set to 53.125 g, the combined target weight is set to (MT−MB−MR) + ΔMB (= 796.875 g). It is preferable to perform combination calculation of the objects to be weighed and to discharge the objects to be weighed from the medium input weighing hopper, the large input weighing hopper 21 and the loss-in hopper 42 selected for the combination.

  On the other hand, when the loss-in discharge weight MR exceeds the threshold weight (in the case of “NO” in step S808), the number of hoppers of the medium input weighing hopper is reviewed (step S810), and in step S805, the combination target weight and the loss-in discharge weight Each MR needs to be temporarily set again. For example, if one “16” medium input weighing hopper with the maximum specific gravity of the object to be weighed is added, the loss-in discharge weight MR can be set to a smaller amount.

  As described above, in the packer scale 100 of the present embodiment, the loss-in discharge weight MR and the combined target weight are the target weight MT of the object to be measured, the volume input weight MB and the predicted variation amount ΔMB of the volume input weight MB, and the packer scale. 100 hopper states.

  As described above, in the packer scale 100 of the present embodiment, the loss-in discharge weight MR is reduced by the loss-in discharge by the loss-in hopper 42 (in other words, the loss-in discharge accuracy is increased and the loss-in discharge time is reduced by reducing the weight of the loss-in hopper 42). Can be appropriately performed by controlling the hopper state of the packer scale 100 (in this case, changing the number of hoppers of the medium throw-in weighing hopper).

  Here, the hopper state of the packer scale 100 is changed according to the number of hoppers of the medium throw-in weighing hoppers, but is not limited thereto. You may change this hopper state with the specific gravity of the to-be-measured object in a medium throwing-in weighing hopper. For example, the weight of the loss-in hopper 42 can be set to a small amount by changing the minimum specific gravity of the object to be weighed in the medium input weighing hopper from “1” to “0.5”. Measurement accuracy can be improved. Further, the hopper state may be changed according to the number of hoppers of the loss-in hopper 42. For example, by increasing the number of hoppers of the loss-in hopper 42 from one to two, the weighing amount of the loss-in hopper 42 can be set to a small amount (that is, half the amount), and the weighing speed and weighing accuracy of the object to be weighed can be improved.

[Other specification design examples of packer scale]
Next, another specification design example of the packer scale 100 of the present embodiment will be described in detail with reference to the drawings.

  FIG. 9 is a flowchart showing another specification design example of the packer scale according to the embodiment of the present invention.

  The specification of the packer scale 100 can be designed as follows by desktop calculation.

  First, the target weight MT of the object to be weighed is determined (step S901), and the volume input weight MB of the object to be weighed into the large input weighing hopper 21 is determined (step S902). Next, the variation amount ΔMB of the volume input weight MB is predicted empirically (step S903). Note that Steps S901, S902, and S903 are the same as Steps S801, S802, and S803, and thus detailed descriptions of Steps S901, S902, and S903 are omitted.

  By the way, the predicted variation amount ΔMB in step S903 is closely related to the fluidity of the object to be weighed. When the fluidity of the object to be weighed is extremely bad, the predicted variation amount ΔMB is larger than the expected range. There is a case.

  Therefore, as shown in FIG. 9, it is determined whether or not the predicted variation amount ΔMB is within a predetermined amount (step S904). If it exceeds the predetermined amount (in the case of “NO” in step S904), the number of hoppers of the intermediate input weighing hopper May be reviewed in advance (step S905).

  For example, by adding one “16” medium input weighing hopper that maximizes the specific gravity of the object to be weighed, the loss-in discharge weight MR can be set to a smaller amount. It can correspond to.

  In step S905, the number of hoppers of the medium throw-in weighing hopper is reviewed, but the present invention is not limited to this. You may review the specific gravity of the object to be weighed in the medium input weighing hopper. For example, the loss-in discharge weight MR can be set to a small amount by changing the minimum specific gravity of the object to be weighed in the medium input weighing hopper from “1” to “0.5”. Further, the number of hoppers of the loss-in hopper 42 may be reviewed. For example, by increasing the number of hoppers of the loss-in hopper 42 from one to two, the loss-in discharge weight MR can be set to a small amount (that is, a half amount).

[Variation control of volume input weight of weighing object to large input weighing hopper]
The physical property values of the objects to be weighed (for example, the bulk density, fluidity, adhesion, etc. of the objects to be weighed) tend to change due to changes in the surrounding environment, switching of the objects to be weighed, and the like. Then, the variation of the volume input weight MB may become remarkable (that is, the variation amount ΔMB of the volume input weight MB may increase).

  Therefore, an example of variation control of the volume input weight MB of the object to be weighed into the large input weighing hopper 21 will be described in detail below with reference to the drawings.

  FIG. 10 is a flowchart showing an example of variation control of the volume input weight of the object to be weighed into the large input weighing hopper.

  The controller is based on a control program for executing the operation of each part of the packer scale 100 at an appropriate time after installation of the packer scale 100 to the delivery destination (for example, every predetermined time interval during operation of the packer scale 100). Then, the following operation is executed while controlling each part of the packer scale 100.

  First, the controller uses the load signals output from the load cells LC1, LC2, LC3, and LC4 to monitor the variation in the volume input weight MB due to the change in the physical property value of the object to be weighed (step S1001).

  Next, the controller determines whether or not the variation amount ΔMB of the volume input weight MB is within a predetermined amount using the load signals output from the load cells LC1, LC2, LC3, and LC4 (step S1002).

  When the variation amount ΔMB of the volume input weight MB exceeds the predetermined amount (in the case of “NO” in step S1002), the controller measures the medium input weighing hopper so that the variation amount ΔMB enters the predetermined amount. The input flow rate of the object is adjusted (step S1003). For example, in this example, the first, second, third, and fourth middle throw cut gates 54, 55 above the first, second, third, and fourth middle throw weighing hoppers 64, 65, 66, 44, By adjusting the opening degree of 56 and 37 using the drive device which drives them, the input flow rate of the object to be weighed in step S1003 can be adjusted.

  Specifically, when the amount of variation ΔMB exceeds a predetermined amount due to a decrease in the volume input weight MB, the first, second, third, and fourth intermediate input cut gates 54, 55, 56, 37 are opened. You should widen the degree. Then, the first, second, third, and fourth medium input weighings are carried out while keeping the opening time of the discharge ports of the first, second, third, and fourth medium input chutes 61, 62, 63, 43 constant. The input weights S1, S2, S3, and S4 of the objects to be weighed into the hoppers 64, 65, 66, and 44 can be increased to an appropriate amount (that is, the first, second, third, and fourth medium input weighing hoppers 64, 65). , 66, 44 can increase the flow rate of the object to be weighed).

  As described above, in the packer scale 100 of the present embodiment, the variation amount ΔMB (for example, the decrease in the volume input weight MB) of the volume input weight MB of the object to be weighed in the large input measurement unit 10 is determined by the medium input measurement unit 50. It can be offset appropriately by adjusting the flow rate of the object to be weighed.

  In this example, the first, second, third, and fourth intermediate charging cut gates 54, 55, 56, and 37 are respectively connected to the first, second, third, and fourth intermediate charging weighing hoppers 64, 65, It is used as an adjustment member for an adjuster that adjusts the flow rate of the object to be weighed into 66 and 44. However, such an adjustment member is not limited to a cut gate. For example, the adjuster is a feeder for an object to be weighed such as a screw feeder or an electromagnetic feeder, which is disposed above the first, second, third and fourth middle input weighing hoppers 64, 65, 66, 44. (Not shown).

[Variation control of the loss-in discharge weight of the object to be weighed from the loss-in hopper]
The physical property values of the objects to be weighed (for example, the bulk density, fluidity, adhesion, etc. of the objects to be weighed) tend to change due to changes in the surrounding environment, switching of the objects to be weighed, and the like. Then, the loss-in discharge weight MR (target amount) changes, and as a result, the accuracy of the loss-in discharge weight MR may not be maintained with high accuracy.

  Therefore, an example of variation control of the loss-in discharge weight MR of the object to be weighed from the loss-in hopper 42 will be described in detail below with reference to the drawings.

  FIG. 11 is a flowchart showing an example of variation control of the loss-in discharge weight of an object to be weighed from the loss-in hopper.

  The controller is based on a control program for executing the operation of each part of the packer scale 100 at an appropriate time after installation of the packer scale 100 to the delivery destination (for example, every predetermined time interval during operation of the packer scale 100). Then, the following operation is executed while controlling each part of the packer scale 100.

  First, using the load signal output from the load cell LC8, the controller monitors the variation in the loss-in discharge weight MR (target amount) due to the change in the physical property value of the object to be weighed (step S1101).

  Next, the controller uses the load signal output from the load cell LC8 to determine whether or not the variation amount ΔMR of the loss-in discharge weight MR is within a predetermined amount (step S1102).

  When the variation amount ΔMR of the loss-in discharge weight MR exceeds a predetermined amount (in the case of “NO” in step S1102), the controller supplies the intermediate input weighing hopper so that the variation amount ΔMR is equal to or smaller than the predetermined amount. Adjust the input flow rate of the object to be weighed. For example, in this example, the first, second, third, and fourth middle throw cut gates 54, 55 above the first, second, third, and fourth middle throw weighing hoppers 64, 65, 66, 44, By adjusting the opening degree of 56 and 37 using the drive device which drives them, the input flow rate of the object to be weighed in step S1102 can be adjusted.

  Specifically, when the variation amount ΔMR of the loss-in discharge weight MR exceeds a predetermined amount, the opening degree of the first, second, third, and fourth middle cut gates 54, 55, 56, 37 may be adjusted. . Then, the first, second, third, and fourth medium input weighings are carried out while keeping the opening time of the discharge ports of the first, second, third, and fourth medium input chutes 61, 62, 63, 43 constant. The input weights S1, S2, S3, and S4 of the objects to be weighed into the hoppers 64, 65, 66, and 44 can be increased or decreased to an appropriate amount (that is, the first, second, third, and fourth medium input weighing hoppers 64, 65). , 66, 44 can adjust the flow rate of the object to be weighed).

  As described above, in the packer scale 100 of the present embodiment, the variation amount ΔMR of the loss-in discharge weight MR (target amount) of the object to be weighed in the small input weighing unit 30 is set as the input flow rate of the object to be weighed in the medium input weighing unit 50. Can be adjusted appropriately.

  In this example, the first, second, third, and fourth intermediate charging cut gates 54, 55, 56, and 37 are respectively connected to the first, second, third, and fourth intermediate charging weighing hoppers 64, 65, It is used as an adjustment member for an adjuster that adjusts the flow rate of the object to be weighed into 66 and 44. However, the adjustment member of such an adjuster is not limited to a cut gate. For example, the adjuster is a feeder for an object to be weighed such as a screw feeder or an electromagnetic feeder, which is disposed above the first, second, third and fourth middle input weighing hoppers 64, 65, 66, 44. (Not shown).

(First modification)
In the packer scale 100 of the present embodiment, the controller monitors the variation of the volume input weight MB and the loss-in discharge weight MR. However, the present invention is not limited to this.

  Hereinafter, an example in which a packer scale control system is constructed using various monitoring items for self-diagnosis and self-recovery of the packer scale will be described.

  Note that the following monitoring items are merely examples, and other monitoring items may be used in accordance with the configuration of the packer scale.

<Monitoring items for the entire packer scale>
(1) Packer scale capability (eg weighing speed)
As this example, there is a number P (for example, OO pack / h) of the objects to be weighed per unit time by the packer scale.

In addition, the average P _{AV of the} number of objects to be weighed (for example, the average P of the number of objects to be weighed P per unit time when the objects to be weighed 10 times are discharged) _AV ).

Incidentally, the controller, the bagging number P and the average P _AV, not shown detecting means (e.g., the counter of the control device for measuring the cycle time of the objects to be weighed) can be obtained by using the output signal of these value _P, can be monitored _{P AV.} For example, when the controller detects the discharge time of the objects to be weighed in the bag using the counter, the discharge time can be converted into the number P of the objects to be weighed per unit time at the present time.

(2) Accuracy of Packer Scale As an example, there is, for example, a variation amount of a bag weight of an object to be weighed by a packer scale (a variation amount ΔMT with respect to a target weight MT).

Further, for example, when the bag of the object to be weighed is performed five times using the packer scale, the average ΔMT _AV of the variation amount of the bag weight of the object to be weighed, and a range corresponding to these maximum and minimum there is ΔMT _R. For example, when the variation amount ΔMT of the weight of the object to be weighed fluctuates as ΔMT = 1 g, 2 g, −4 g, 5 g, 1 g, the average ΔMT _AV is ΔMT _AV = (1 g + 2 g + (− 4 g) +5 g + 1 g). ) / 5 = 1 g, and the range DerutaMT _R is, ΔMT _R = 5g - a 4g) = 9g - (.

Incidentally, the controller, the average DerutaMT _AV and range DerutaMT _R, not shown detecting means (e.g., a load cell) can be obtained by using the output signal of these values DerutaMT _AV, the DerutaMT _R can be monitored.

<Monitoring items of large input weighing unit 10>
(1) Capacity of the large input weighing unit 10 (for example, weighing speed)
As an example, there are opening amounts of the large input cut gates 15A and 15B and an opening time of the discharge port of the weighing hopper body 20.

  The controller can acquire the opening degree of the large input cut gates 15A and 15B and the opening time of the discharge port of the weighing hopper main body 20 using the output signal of the rotary encoder 70, and can monitor these values. .

(2) Accuracy of Large Input Weighing Unit 10 As an example, the volume input weight MB of the object to be weighed into the large input weighing hopper 21 when the object to be weighed is packed a plurality of times (for example, five times). there are ranges MB _R of the average _{MB AV} and volume-up weight MB. For example, when the volume input weight MB fluctuates as MB = 15.650 kg, 15.000 kg, 15.150 kg, 15.350 kg, 15.450 kg, the average MB _AV is MB _AV = (15.650 kg + 15. 000kg + 15.150kg + 15.350kg + 15.450kg) /5=15.300kg next, the range MB _{R becomes} MB R = 15.650kg-15.000kg = 650g .

Incidentally, the controller, the average _{MB AV} and range MB _R volume turned weight MB, can be obtained by using the output signal of the load cell LC1, LC2, LC3, LC4, these values _MB AV, the MB _R can be monitored.

<Monitoring items of the medium input weighing unit 50>
(1) Capability (for example, measuring speed) of the medium throw-in measuring unit 50
As an example, the opening degree of the first, second, third and fourth middle insertion cut gates 54, 55, 56 and 37 and the first, second, third and fourth middle insertion chutes 61, 62, 63, There are 43 outlet opening times.

  In addition, the operating rates of the first, second, third, and fourth medium input weighing hoppers 64, 65, 66, 44 (that is, the first, second, third, and fourth medium input weighing hoppers 64, 65). , 66 and 44 are selected in combination).

  It should be noted that the controller controls the opening degree of the first, second, third, and fourth middle insertion cut gates 54, 55, 56, and 37 and the first, second, third, and fourth middle insertion chutes 61. , 62, 63, 43 can be obtained by using an output signal of a detection means (for example, a rotary encoder) not shown, and these values can be monitored. In addition, the controller can obtain the operation rate of each of the first, second, third, and fourth middle input weighing hoppers 64, 65, 66, 44 using the output signals of the load cells LC5, LC6, LC7, LC9. , These operating rates can be monitored.

(2) Accuracy of the intermediate input weighing unit 50 As an example, the average of the medium input amount of the objects to be weighed into the first, second, third and fourth intermediate input weighing hoppers 64, 65, 66, 44 and There is a range. Meaning of average and range of these dosages can be easily understood by reference to the specific example of the average MB _AV and range MB _R of the full flow metering section 10, a detailed description thereof will be omitted.

  Also, the amount of the objects to be weighed selected and discharged from the first, second, third and fourth medium input weighing hoppers 64, 65, 66, 44 (that is, the amount of the objects to be weighed in the hopper selected for the combination). Total weight).

  The controller can acquire the average and range of the medium input amount as well as the amount of objects to be weighed selectively discharged using the output signals of the load cells LC5, LC6, LC7 and LC9, and monitor these values. it can.

<Monitoring items of the small input weighing unit 30>
(1) Capability of small input weighing unit 30 (for example, weighing speed)
Examples of this include the opening of the loss-in discharge gate 32 and the opening time of the discharge port of the loss-in hopper 42.

  The controller can acquire the opening degree of the loss-in discharge gate 32 and the opening time of the discharge port of the loss-in hopper 42 by using an output signal of a detection means (for example, a rotary encoder) (not shown). Can be monitored.

(2) the accuracy this example of the small-on the weighing unit 30, there is a range MR _R average _{MR AV} and Los Inn discharge weight MR of Los Inn discharge weight MR, Los Inn discharge weight MR discharged from Rosuinhoppa 42. Meaning of average MR _AV and range MR _R of Los Inn discharge weight MR can be easily understood by reference to the specific example of the average MB _AV and range MB _R of the full flow metering section 10, and a detailed description thereof will be omitted To do.

Incidentally, the controller, the Los Inn discharge weight MR, the range MR _R average _{MR AV} and Los Inn discharge weight MR of Los Inn discharge weight MR, can be obtained by using the output signal of the load cell LC8, you can monitor these values.

  As described above, in the packer scale of this modification, the controller performs various monitoring items for self-diagnosis and self-recovery that correlate with the measurement speed or measurement accuracy of the packer scale based on the output signal of the detection means of the packer scale. Can guide you. Therefore, in this packer scale, the controller can optimally control the packer scale using the monitoring items.

For example, the controller monitors the average MB _AV of the volume input weight MB, and determines whether the average MB _AV is in the optimum range (self-diagnosis). For example, when the average MB _AV falls below the optimum range due to any cause (for example, fluctuations in the bulk density, fluidity, adhesion, etc. of the object to be weighed), It is possible to restore the packer scale's total discharge weight to an appropriate amount. In this example, the controller automatically widens the opening degree of the first, second, third and fourth middle cut gates 54, 55, 56 and 37, and the first, second, third and fourth. It is possible to increase the flow rate of the object to be weighed into the medium charging weighing hoppers 64, 65, 66, and 44. Thereby, discharge | emission of the to-be-measured object from a packer scale can be reset to a normal state.

  In addition, the controller decreases the volume input weight MB and monitors the operating rates of the first, second, third and fourth medium input weighing hoppers 64, 65, 66 and 44 so as to compensate for this decrease. In addition, the operating rate of the first, second, third, and fourth medium charging weighers 64, 65, 66, 44 can be increased. Thereby, the measurement speed of a to-be-measured object can be improved.

  In addition, the controller can monitor the operation rate of each of the medium throw-in weighing hoppers and control the operation rate of the medium throw-in weighing hopper so as to keep the loss-in discharge weight MR at a predetermined amount (a constant amount). Thereby, the weighing speed of the object to be weighed and the weighing accuracy of the object to be weighed can be maintained at desired values, respectively.

In addition, the controller can control the operating rate of the medium throw-in weighing hopper so that the number P of the objects to be weighed per unit time by the packer scale 100 is maintained at a predetermined amount (a constant value).
Thereby, the measurement speed of a to-be-measured object can be maintained at a desired value.

(Second modification)
The display of the controller can constitute various system screens by switching the display mode of the display.

Hereinafter, as an example thereof, a system screen in which the controller displays a result of determination (self-diagnosis) as to whether or not the average MB _AV of the volume input weight MB as the monitoring item is within the optimum range on the display unit. State. In addition, after the controller determines that the average MB _AV of the volume input weight MB is outside the optimum range, the display indicates that the discharge of the object to be weighed from the packer scale has returned to the normal state (self-recovery). The system screen to be displayed is also described.

The controller can display the average MB _AV of the volume input weight MB, which fluctuates from time to time, on the display screen of the display device using a line graph or the like with the horizontal axis as the passage of time. At this time, the controller, for some reason (e.g., bulk density of the articles, flowable, variations such as adhesion) by, when the average MB _AV volume turned weight MB is close to the boundary of the optimum range, Alternatively, when the line graph is out of the optimal range, this line graph is displayed in different colors so that it can be distinguished from other graphs (eg, yellow when approaching the boundary of the optimal range, red when entering the optimal range) Good.

As a result, the operator can visually recognize that the average MB _AV of the volume input weight MB has approached the boundary of the optimum range, or has entered the outside of the optimum range. It is possible to detect the possibility that the discharge of the weighing object falls into an abnormal state.

Further, after the controller determines that the average MB _AV of the volume input weight MB is outside the optimum range, the increase / decrease in the average MB _AV is, for example, the first, second, third and fourth medium input weighings. When the total discharge weight of the object to be weighed is automatically compensated automatically by adjusting the flow rate of the object to be weighed into the hoppers 64, 65, 66, 44, etc. Color-coded display (for example, blue) is preferable so that it can be distinguished from the graph.

  Thereby, the operator can know visually that discharge | emission of the to-be-measured object from a packer scale returned to the normal state automatically.

(Third Modification)
In the packer scale 100 of the present embodiment, the controller uses the load signals output from the load cells LC1, LC2, LC3, LC4, LC5, LC6, LC7, LC8, and LC9, respectively, , Second, third, and fourth medium input weighing hoppers 64, 65, 66, 44, weight of objects to be weighed selectively discharged (hereinafter sometimes abbreviated as “combined discharge weight”), and loss-in discharge Each of the weights MR is weighed, and these weighed objects are discharged to the collecting chute 22.

  In this modification, a configuration example of a packer scale provided with a double check function for such volume input weight MB, combination discharge weight, and loss-in discharge weight MR will be described. In particular, in the packer scale 100 of the present embodiment, as shown in FIG. 2, the first, second, third, and fourth middle input weighing units 50 </ b> A, 50 </ b> B, 50 </ b> C, 50 </ b> D are surrounded so as to surround the large input measurement unit 10. Further, since the small input weighing unit 30 is arranged, there is an advantage that the following double check function can be easily configured.

(1) Double check of combined discharge weight For double check of combined discharge weight, for example, right under all discharge ports of the first, second, third and fourth medium input weighing hoppers 64, 65, 66, 44 The configuration of the packer scale 100 may be changed so that the supply port of the large throw-in weighing hopper 21 is located.

  As described above, the objects to be weighed that are selected and discharged from the first, second, third, and fourth medium input weighing hoppers can be put into the large input weighing hopper, and as a result, combined using the large input weighing hopper. The discharge weight can be double checked.

(2) Double check of loss-in discharge weight MR In the double-check of loss-in discharge weight MR, for example, the configuration of the packer scale 100 is such that the supply port of the large input weighing hopper 21 is located directly below the discharge port of the loss-in hopper 42. Can be changed.

  As described above, the object to be weighed and discharged from the loss-in hopper can be put into the large throw-in weighing hopper, and as a result, the loss-in discharge weight MR can be double checked using the large throw-in weighing hopper.

  In addition, for the double check of the loss-in discharge weight MR, for example, the supply of any of the first, second, third and fourth medium input weighing hoppers 64, 65, 66, 44 just below the discharge port of the loss-in hopper 42. The configuration of the packer scale 100 may be changed so that the mouth is located.

  As described above, the object to be weighed discharged from the loss-in hopper can be put into any one of the first, second, third and fourth medium input weighing hoppers, and as a result, the first, second, third In addition, the loss-in discharge weight MR can be double-checked using the fourth medium input weighing hopper.

(3) Double check of volume input weight MB, combined discharge weight and loss-in discharge weight MR Double check of total weight of volume input weight MB, combination discharge weight and loss-in discharge weight MR is performed by using the discharge port of large input weighing hopper 21, Separate large weighing hoppers (not shown) immediately below all the discharge ports of the first, second, third, and fourth intermediate charging hoppers 64, 65, 66, and 44 and the discharge port of the loss-in hopper 42 The configuration of the packer scale 100 may be changed so that the supply port is located.

  As described above, the objects to be weighed from the large input weighing hopper, the objects to be weighed selectively from the first, second, third and fourth medium input weighing hoppers, and the objects to be discharged from the loss-in hopper. All of the objects to be weighed can be put into the large weighing hopper, and as a result, the total weight of the volume input weight MB, the combined discharge weight and the loss-in discharge weight MR can be double-checked using the large measurement hopper.

(4) Double check of volume input weight MB and combination discharge weight Double check of volume input weight MB and total discharge weight of combination is performed by using the discharge port of large input weighing hopper 21 and the first, second, third, and second checks. 4 If the configuration of the packer scale 100 is changed so that the supply port of a separate large-scale weighing hopper (not shown) is located immediately below all the discharge ports of the middle charging weighing hoppers 64, 65, 66, 44 Good.

  As described above, all of the objects to be weighed and discharged from the large input weighing hopper and the objects to be weighed selectively discharged from the first, second, third and fourth medium input weighing hoppers are all inside the large weighing hopper. As a result, the total weight of the volume input weight MB and the combined discharge weight can be double-checked using this large weighing hopper.

(5) Double check of combined discharge weight and loss-in discharge weight MR Double check of total weight of combined discharge weight and loss-in discharge weight MR includes first, second, third and fourth medium input weighing hoppers 64, 65, It is only necessary to change the configuration of the packer scale 100 so that the supply ports of separate large weighing hoppers (not shown) are located immediately below all of the discharge ports 66 and 44 and the discharge port of the loss-in hopper 42. .

  As described above, all the objects to be weighed selected and discharged from the first, second, third and fourth medium weighing hoppers and the objects to be weighed and discharged from the loss-in hopper are all put into the large-scale weighing hopper. As a result, the total weight of the combined discharge weight and the loss-in discharge weight MR can be double-checked using the large weighing hopper.

(6) Double check of volume input weight MB and loss-in discharge weight MR Double check of the total weight of volume input weight MB and loss-in discharge weight MR is performed using the discharge port of large input weighing hopper 21 and the discharge port of loss-in hopper 42. What is necessary is just to change the structure of the packer scale 100 so that the supply port of a separate large scale weighing hopper (not shown) may be located directly below.

  As described above, all of the objects to be weighed from the large input weighing hopper and the objects to be weighed in from the loss-in hopper can be put into the large-sized weighing hopper. The total weight of the volume input weight MB and the loss-in discharge weight MR can be double checked.

(Fourth modification)
In the above embodiment and the first, second, and third modified examples, the small input weighing unit 30 is used for the loss-in weighing, and the object to be weighed includes the loss-in hopper 42 for the loss-in discharge weight MR. Said. With this configuration, there is an advantage that the weighing accuracy of the object to be weighed can be maintained with high accuracy. However, the small input weighing hopper is not necessarily the loss-in hopper 42. That is, the small input weighing hopper is configured to discharge an object to be weighed corresponding to at least a small input discharge weight (in this embodiment, the loss-in discharge weight MR) that is lighter than the volume input weight MB and the combination target weight. That's fine.

  For example, the small throw-in weighing unit 30 may include a normal small throw-in weighing hopper (not shown) below the discharge port of the small throw chute (not shown). In this case, by opening the discharge port of the small input chute using, for example, a cut gate (not shown), an object to be weighed is input (supplied) from the main discharge port into the small input weighing hopper, and Objects are weighed using a small input weighing hopper. Then, the objects to be weighed are discharged to the collecting chute 22 by opening a hopper gate (not shown) for opening and closing the discharge port of the small input weighing hopper.

(5th modification)
In the above embodiment and the first and second modified examples, various adjustments are made to return the object to be weighed from the packer scale 100 to the normal state by using the input flow rate adjustment of the object to be weighed in the middle input weighing unit 50. Although an example has been described, the operation amount of such feedback control is not necessarily limited to the input flow rate of the object to be weighed in the intermediate input weighing unit 50.

  For example, the discharge of the object to be weighed from the packer scale 100 may be returned to the normal state by using the input flow rate adjustment of the object to be weighed in the large input weighing unit 10.

  In this case, in this example, the large input cut gates 15A and 15B can be used as an adjustment member for an adjuster that adjusts the flow rate of the object to be weighed into the large input weighing hopper 21. Not limited to cut gates. As described above, the adjuster may be, for example, a feeder (not shown) for an object to be weighed such as a screw feeder or an electromagnetic feeder disposed above the large throw-in weighing hopper 21.

(Sixth Modification)
In the above embodiment, as shown in FIG. 2, the first, second, third and fourth middle input weighing units 50 </ b> A, 50 </ b> B, 50 </ b> C, 50 </ b> D and the small input measurement unit so as to surround the large input measurement unit 10. Although 30 is arranged, the arrangement configuration of the small input weighing unit 30 is not limited to this.

  For example, the configuration of the packer scale can be changed so that the discharge port of the loss-in hopper 42 of the small input weighing unit 30 is positioned directly above the supply port of the large input weighing hopper 21.

  As described above, the packer scale can be configured compactly.

  Further, the discharge port of the loss-in hopper 42 of the small input weighing unit 30 is positioned immediately above any one of the supply ports of the first, second, third, and fourth medium input weighing hoppers 64, 65, 66, 44. The configuration of the packer scale can be changed.

  As described above, the packer scale can be configured compactly.

(Seventh Modification)
From the above description of the embodiment and the first and second modifications, those skilled in the art can make various improvements described below.

  For example, the packer scale may include a plurality of (for example, two) large input weighing hoppers for the purpose of improving the capacity (measuring speed) of the packer scale.

  Further, the packer scale may include a plurality of (two or three, etc.) loss-in hoppers. Thereby, since the weighing of the loss-in hopper can be reduced, the weighing accuracy of the packer scale can be improved.

  In addition, the packer scale can be used to appropriately cope with the limits of the packer scale performance due to a large variation in the physical property values of the object to be weighed (for example, bulk density, fluidity, adhesion, etc. of the object to be weighed). May be provided with a plurality of medium throwing weighing hoppers having the same specific gravity (for example, two medium throwing weighing hoppers having a specific gravity of 0.5).

  In addition, the packer scale can be used to appropriately cope with the limits of the packer scale performance due to a large variation in the physical property values of the object to be weighed (for example, bulk density, fluidity, adhesion, etc. of the object to be weighed). May be provided with a plurality of medium throw-in weighing hoppers with a specific gravity extremely close to each other (for example, a medium throw-in weighing hopper with a specific gravity of 0.4 and a medium throw-in weighing hopper with a specific gravity of 0.5).

  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 main body 21 Large input weigh hopper 21A Large input weigh hopper main body 22 Collecting chute 30 Small input weighing section 31 Loss-in input gate 32 Loss-in discharge gate 34 Rotary actuator 35 for loss-in input gate Rotary actuator 36 for loss-in discharge gate Rotary actuator 37 for medium feed cut gate Fourth medium feed cut gate 38 Fourth medium feed weighing hopper gate 39 Rotary actuator 40 for fourth medium feed weighing hopper gate Relay section 40A Small feed branch 40B Fourth middle throwing branch 40D Opening 41 Loss-in throwing chute 42 Loss-in hopper 43 Fourth middle throwing chute 44 Fourth middle throwing weighing hopper 44A Fourth middle throwing weighing hopper main body 50 Middle throwing weighing part 50A First middle throwing weighing part 50B Second middle throwing weighing unit 50C Third middle throwing weighing unit 50D Fourth middle throwing weighing unit 51 Rotary actuator 52 for first middle throwing cut gate Rotary actuator 53 for second middle throwing cut gate Third middle throwing cut gate Rotary actuator 54 of the first medium charging cut gate 56 Second medium charging cut gate 56 Third medium charging cut gate 57 Rotary actuator 58 for the first medium charging weighing hopper gate Rotary actuator 59 for the second medium charging weighing hopper gate Rotating rear chopper for input weighing hopper gate Eta 60 Relay section 60A First middle throwing branch section 60B Second middle throwing branch section 60C Third middle throwing branch section 60D Opening 61 First middle throwing chute 62 Second middle throwing chute 63 Third middle throwing chute 64 First middle Feeding 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 First 2 middle charging weighing hopper gate 69 third middle 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 instruction controller 74 AC for middle charging weighing unit control Servo driver 100 Packer scale (weighing device)

Claims (13)

A large input weighing hopper for weighing an object to be weighed less than a target weight of the object to be weighed by supplying a volume input weight, and for weighing the object to be weighed and discharging the object to be weighed after weighing. ,
By supplying the objects to be weighed, each of which is adjusted with a different specific gravity, a combination operation based on the weight of the objects to be weighed is performed, and the object to be weighed is based on the result of the combination operation. A plurality of medium-injection weighing hoppers from which weighed items are discharged;
A small input weighing hopper for discharging an object to be weighed for a small input discharge weight that is lighter than the volume input weight;
A weighing device comprising:
In the combination calculation, the combination of the intermediate input weighing hoppers in which the total weight of the objects to be weighed in the intermediate input weighing hopper is closest to a predetermined combination target weight is obtained, and the intermediate input selected for the combination is obtained. The above objects to be weighed in the weighing hopper are selected and discharged in combination.
The small input / output weight and the combined target weight are the target weight of the object to be weighed, the predicted variation amount of the volume input weight and the volume input weight, and the medium input weighing hopper or the small input weighing of the measuring device. A weighing device that is set based on the state of the hopper .   The weighing apparatus according to claim 1, wherein the small input weighing hopper is used for loss-in weighing, and the object to be weighed is a loss-in hopper that is subjected to loss-in discharge weight as the small input discharge weight. The status of the meter in the turned weighing hopper, the weighing apparatus according to claim 1 or 2 modified using hoppers number in said turned weighing hopper.   The small input / output weight and the combination target weight are set such that an input weight of an object to be weighed into the medium input weighing hopper having the smallest specific gravity is equal to the small input / discharge weight. 2. The weighing device according to 2.   The weighing device according to claim 4, wherein the small input / output weight is set to zero when the small input / output weight is within an allowable weight range of a target weight of the object to be weighed.   5. The weighing device according to claim 4, wherein when the small input / output weight exceeds a predetermined threshold weight, the number of hoppers of the medium input weighing hopper is increased, and the small input / output weight and the combination target weight are reset. . An adjuster for adjusting the flow rate of an object to be weighed into the intermediate charging weighing hopper;
A controller capable of receiving a load signal output from a load detector used for weighing the large input weighing hopper;
With
The controller uses the load signal to monitor a variation in the volume input weight due to a change in a physical property value of the object to be weighed, and if the variation in the volume input weight exceeds a predetermined amount, the volume input The weighing device according to claim 1, wherein the adjuster is controlled so that an amount of variation in weight falls within the predetermined amount.   The weighing device according to claim 7, wherein the small input weighing hopper is used for loss-in weighing, and the object to be weighed is a loss-in hopper that is loss-in discharged by a loss-in discharge weight as the small input discharge weight.   The weighing device according to claim 7 or 8, wherein when the adjuster includes a cut gate above the medium throw-in weighing hopper, the controller controls an opening degree of the cut gate. An adjuster for adjusting the flow rate of an object to be weighed into the intermediate charging weighing hopper;
A controller capable of receiving a load signal output from a load detector used for weighing the small input weighing hopper;
With
The controller uses the load signal to monitor the variation of the small input / output weight due to a change in the physical property value of the object to be weighed, and when the variation of the small input / output weight exceeds a predetermined amount, The weighing device according to claim 1, wherein the adjuster is controlled so that a variation amount of a small input / output weight falls within the predetermined amount.   The weighing device according to claim 10, wherein the small input weighing hopper is used for loss-in weighing, and the object to be weighed is a loss-in hopper for loss-in discharge corresponding to the loss-in discharge weight as the small input discharge weight.   The weighing device according to claim 10 or 11, wherein, when the adjuster includes a cut gate above the medium throw-in weighing hopper, the controller controls an opening degree of the cut gate. When a small input discharge weight that is lighter than the volume input weight is discharged using a small input weighing hopper,
The small input / output weight and the combined target weight are the target weight of the object to be weighed, the predicted variation amount of the volume input weight and the volume input weight, and the medium input weighing hopper or the small input weighing of the measuring device. Based on the state of the hopper, the weight of the object to be weighed into the medium input weighing hopper having the smallest specific gravity is set to be equal to the small input / output weight,
The weighing apparatus according to claim 1, wherein the small input weighing hopper is not incorporated when the small input / discharge weight is within an allowable weight range of a target weight of the object to be weighed.

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