JP5846920B2 - Weighing device - Google Patents

Description

  The present invention relates to a weighing device. In particular, the present invention adjusts the objects to be weighed of powders (detergents, fertilizers, etc.) and granules (resin pellets, grains, feeds, etc.) to a predetermined target weight, and is applied to packaging machines (suppliers) such as bags. The present invention relates to a weighing device for filling.

  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 adjusts the objects to be weighed of powder (detergent, fertilizer, etc.) and granules (resin pellets, grains, feed, etc.) to a predetermined target weight, and also packs the objects to be weighed into bags, etc. This is a type of automatic weighing device that fills a supply destination) with an object to be weighed. 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).

  In addition, the weighing of objects to be weighed is made faster and more accurate by combining a large amount of objects to be weighed into the hopper and a combination of a plurality of replenishing inputs with different volume ratios (for example, 1: 2: 4: 8). An intended apparatus has been proposed (see Patent Documents 3, 4, and 5). In this device, a large input storage tank having a capacity capable of storing an object to be weighed which is smaller than the target weight and close to the target weight (for example, about 90%), and a large input (volume input) input by the large input storage tank ) And a plurality of additional storage tanks having different volume ratios, which are used to compensate for the shortage relative to the target weight. Then, an insufficient weight with respect to the target weight of the weight of the object put into the large input storage tank is obtained, and a combination of the additional storage tanks closest to the insufficient weight is selected.

  In addition, in order to perform more accurate weighing, quantitative weighing scales have also been developed that perform loss-in-weight weighing (loss-in weighing) from small weighing hoppers and discharge them, thereby performing quantitative weighing. Yes. For example, in this type of quantitative balance, as shown in FIG. 8, a large-scale weighing hopper is loaded (volume-filled) with a target weighing about 95% of the target weight. Then, after the stabilization time A1 has elapsed, the weight is weighed to calculate the insufficient weight relative to the target weight, and the object to be weighed in the large weighing hopper is discharged (volume discharge). FIG. 8 is a time chart showing a measurement procedure of a conventional quantitative balance.

  On the other hand, after the stabilization time A2 has elapsed after a small amount of material to be weighed into the small weighing hopper aiming at about 10% of the fixed value, the insufficient weight obtained by the calculation is removed from the small weighing hopper. Loss-in weighing and discharging. Loss-in weighing is a measurement that constantly monitors the weight of the weighing object in the small weighing hopper and stops discharging the weighing object from the small weighing hopper when the weight is reduced from the initial weight. It is a method.

  As shown in FIG. 8, since such a quantitative balance performs loss-in measurement based on the insufficient weight obtained after the stabilization time A1 has elapsed, the measurement cycle time of the quantitative balance is set to a large input time, after a large input. The time until the large weighing hopper is stabilized (stable time A1) is based on the loss-in weighing time and becomes longer. In particular, the large charging time and the stabilization time A1 cannot be shortened because they are fixed times determined by the mechanical structure of the quantitative balance. Therefore, in order to shorten the measurement cycle time, it depends on whether the time required for the loss-in measurement can be substantially reduced.

  Therefore, in Patent Document 6, before the discharge of the object to be weighed from the large weighing hopper, the discharge of the insufficient weight with respect to the target weight (loss-in weighing) is started from the small weighing hopper, and the shortage calculated by the calculation is started. Based on the above, a quantitative balance for ending the loss-in measurement has been proposed.

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

  By the way, the time taken to discharge the object to be weighed from the large weighing hopper that has been turned on, and the time taken to discharge the object to be weighed by the loss-in weighing from the small weighing hopper, the position of the large weighing hopper and the small weighing hopper, respectively. The moving time (falling time) of the object to be weighed from to the supply destination (packing machine) is included.

  Therefore, if the movement time of the object to be weighed from the position of the small weighing hopper to the supply destination (packaging machine) can be shortened, the time taken to discharge the object to be weighed by loss-in weighing can be shortened. Thus, the weighing cycle time can be shortened.

  This invention is made | formed in view of such a situation, and it aims at providing the measuring device which can shorten the time concerning a measurement cycle.

  In order to solve the above-described problems, the weighing device according to the present invention is supplied with a weighing object less than the target weight, measures the weight of the weighing object, and discharges the weighing object after weighing. The hopper and the objects to be weighed whose weights are adjusted to be different from each other are supplied, and the combination calculation is performed according to the difference between the weight of the object to be weighed by the large input weighing hopper and the target weight. To compensate for the difference between the plurality of medium input weighing hoppers that discharge the object to be weighed based on the result, the target weight, and the weights of the objects to be weighed discharged from the large input weighing hopper and the medium input weighing hopper A loss-in hopper that discharges the object to be weighed while performing loss-in weighing, and the loss-in hopper is a destination of the discharged object to be weighed more than the large input weighing hopper and the medium input weighing hopper They are disposed close.

  Here, loss-in weighing is a weighing method that constantly monitors the weight of the object in the loss-in hopper and stops discharging the object from the loss-in hopper when the weight is reduced from the initial weight. is there.

  According to the configuration described above, since the large throw-in weighing hopper, the medium throw-in weighing hopper, and the loss-in hopper are provided, it is possible to discharge an object to be weighed with a weight close to the target weight with high accuracy.

  Further, the loss-in hopper is arranged at a position closer to the supply destination of the object to be weighed than the large throw-in weighing hopper and the medium throw-in weighing hopper. For this reason, compared with the configuration in which the large input weighing hopper, the medium input weighing hopper, and the loss-in hopper are arranged so that the distance to the supply destination is substantially the same, the objects to be weighed discharged from the loss-in hopper are supplied to the supply destination. The distance to reach can be shortened. That is, it is possible to reduce the time required for movement (dropping) until the object to be weighed discharged from the loss-in hopper reaches the supply destination.

  Here, the weighing object discharged while performing the loss-in weighing in the loss-in hopper is more than the time required for the weighing object discharged in the large charging weighing hopper and the medium charging weighing hopper to reach the supply destination. The time required to reach is longer. For this reason, if a series of steps of weighing with a large throw-in weighing hopper, a medium throw-in weighing hopper, and a loss-in hopper and discharging an object to be weighed that approximates the target weight is a weighing cycle, the load discharged from the loss-in hopper The time point at which the supply of the weighing object to the supply destination ends is the end of the weighing cycle.

  The weighing device according to the present invention can shorten the time required for the object discharged from the loss-in hopper to reach the supply destination by shortening the distance from the loss-in hopper to the supply destination.

  For this reason, the weighing device according to the present invention has an effect that the time required for the weighing cycle can be shortened.

  The weighing device according to the present invention may be configured such that, in the above-described configuration, the loss-in hopper is disposed in the vicinity of a storage port, which is an opening provided in the supply destination for storing the object to be weighed. Good.

  According to the above configuration, since the loss-in hopper is disposed in the vicinity of the receiving port of the supply destination, an object to be weighed discharged from the loss-in hopper can be immediately stored in the supply destination, and the object to be weighed discharged from the loss-in hopper is supplied to the supply destination. It is possible to shorten the time required to reach.

  The weighing device according to the present invention further includes a collecting chute for collecting the discharged objects to be measured and supplying the collected objects to the supply destination, the collecting chute including the large input weighing hopper and the middle charging hopper. It may be configured to have an isolation wall for isolating the loss-in hopper so that an object to be weighed discharged from each of the input weighing hoppers does not enter the loss-in hopper.

  According to the above configuration, since the collective chute is provided, the objects to be weighed discharged from the large throw-in weighing hopper, the medium throw-in weighing hopper, and the loss-in hopper can be gathered and supplied to the supply destination.

  Here, the large throw-in weighing hopper and the medium throw-in weighing hopper exist at positions farther from the supply destination than the loss-in hopper. For this reason, the objects to be weighed discharged from the large input weighing hopper and the medium input weighing hopper may be mixed in the loss-in hopper arranged near the supply destination, or the loss-in hopper may be buried by the objects to be weighed. .

  However, in the weighing device according to the present invention, since the collective chute has the isolation wall, the objects to be weighed discharged from the large input weighing hopper and the medium input weighing hopper are mixed in the loss-in hopper, It is possible to prevent the loss-in hopper from being buried.

  That is, it is possible to prevent interference with the loss-in hopper due to the objects to be weighed discharged from the large throw-in weighing hopper and the medium throw-in weighing hopper.

  In the weighing device according to the present invention, the collective chute has a first collective chute for collecting the objects to be weighed discharged from the large throw-in weighing hopper and the medium throw-in weighing hopper, and the isolation wall. And a second collective chute that is separated from the first collective chute and guides the objects to be weighed discharged by the loss-in hopper to the supply destination.

  According to the above configuration, since the second collective chute is provided separately from the first collective chute for collecting the objects to be weighed discharged from the large throw-in weighing hopper and the medium throw-in weighing hopper, the loss-in hopper is a large throw-in weighing hopper. In addition, the object to be weighed can be discharged while performing the loss-in measurement without being interfered with the object to be weighed discharged from each of the intermediate charging hoppers.

  The weighing device according to the present invention is configured as described above, and has an effect that the time required for the weighing cycle can be shortened.

It is the figure which showed an example of the packer scale (measuring device) by embodiment of this invention. It is the figure which looked at the packer scale of FIG. 1 in the perpendicular direction. It is a figure which shows an example of arrangement | positioning relationship of the 1st middle throwing-in weighing | measuring part, the 2nd middle throwing-in weighing | measuring part, and the 3rd middle throwing-in weighing | measuring part when the packer scale shown in FIG. 1 is seen from the left. It is a figure which shows an example of the arrangement | positioning relationship of the 4th middle throwing-in weighing part when the packer scale shown in FIG. 1 is seen from the right side, and a small throw-in weighing part. It is the figure which showed an example of the control system of the packer scale of FIG. It is the figure which showed an example of the injection | throwing-in operation | work of the to-be-measured item by the packer scale of embodiment of this invention, measurement operation | movement, and discharge operation | movement. FIG. 6 shows an open / close timing chart of each gate used in the packer scale of FIG. It is a figure which shows an example of the injection | throwing-in operation | movement concerning the measurement control of the to-be-measured object in the packer scale of embodiment of this invention, measurement operation | movement, and discharge | emission operation | movement, The figure (a) is the figure of the to-be-measured object by the packer scale of FIG. It is a time chart which shows an example of the timing of injection | throwing-in and discharge | emission. FIG. 4B is a graph showing an example of a change over time in the input (discharge) weight of the object to be weighed by the packer scale of FIG. It is a time chart which shows the measurement procedure of the conventional quantitative balance.

  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, the same or corresponding members are denoted by the same reference symbols throughout the drawings, and the description thereof is 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 the corresponding configurations of the weighing device. It is an example of an element. Therefore, the features of the weighing device are not limited by the following specific description.

  FIG. 1 is a diagram showing an example of a packer scale (weighing device) 100 according to an embodiment of the present invention. FIG. 2 is a view of the packer scale 100 of FIG. 1 viewed in the vertical direction. In FIG. 2, the figure which looked at the packer scale 100 of FIG. 1 by IIA-IIA is shown.

  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 (50A to 50D) in which the medium to be weighed into the packaging machine (medium amount input) is performed, and small input (small amount inject) of the object to be weighed into the packaging machine A small input weighing unit 30.

  For convenience of the following description, in FIGS. 1 and 2, the objects to be weighed are transferred from the middle of the large input weighing unit 10 (vertical height H) to the medium input weighing unit 50 and the small input weighing unit 30 respectively. The direction in which is distributed is referred to as the “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”.

  In the packer scale 100, it is assumed that gravity acts from “upward” (not shown) to “downward” (not shown), that is, vertically and downwardly. In addition, the direction perpendicular to the left-right direction and perpendicular to the vertical direction is shown as the front-rear direction (the front side of the page in FIG. 1 is “front” and the back side is “rear”).

  Further, in FIG. 1, in order to make it easier to understand the configuration of the small input weighing unit 30 of the packer scale 100, the components of the middle input weighing unit 50 arranged on the right side of the packer scale 100 (fourth shown in FIG. 2). The illustration of the middle throw-in weighing unit 50D) is omitted.

(Configuration of the large input weighing unit)
First, the configuration of the large throw-in weighing unit 10 provided in the packer scale 100 of the present embodiment will be described with reference to FIGS. 1 and 2.

  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 a supply unit 20 </ b> A that is a box having a rectangular cross-sectional shape cut out in the horizontal direction (left-right direction) Disposed below the portion 20A is a discharge portion 20B which is a box having a circular cross-sectional shape cut out in the horizontal direction.

  A circular supply port (not shown) for supplying an object to be weighed is formed at the upper end portion 11 of the weighing hopper body 20, and the object to be weighed is put into the weighing hopper body 20 through this supply port. The Further, when an object to be weighed is introduced from the supply port of the weighing hopper body 20, the object to be weighed may embed air. Therefore, the packer scale 100 of the present embodiment is provided with a pair of mesh-like air vents (not shown) at the upper end 11 of the weighing hopper body 20. And it is comprised so that the air in the measurement hopper main body 20 may be exhausted using this air vent part. 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 discharge portion 20B of the weighing hopper body 20. As a result, the object to be weighed is discharged from the discharge port to the outside of the weighing hopper body 20 (that is, inside the large throw-in weighing hopper 21).

  However, when the object to be weighed is not discharged from the discharge port of the weighing hopper body 20 (when the object to be weighed is temporarily held in the weighing hopper body 20), this discharge port is used as a pair of large input cut gates 15A and 15B. Can be closed.

  The large closing cut gates 15A and 15B are configured to be swingable in the front-rear direction about the rotation shafts 14A and 14B, respectively. That is, the large insertion cut gates 15A and 15B move so that the rotary shafts 14A and 14B are respectively divided into two in the front-rear direction by rotating using the driving force of the AC servomotor 14. At this time, the opening degree of the large input cut gates 15A and 15B is controlled by the instruction controller 71 for controlling the large input metering unit using the rotary encoder 70 as shown in FIG. FIG. 5 is a diagram showing an example of a control system of the packer scale 100 of FIG.

  In this way, the discharge port of the weighing hopper main body 20 is opened using the large input cut gates 15A and 15B, whereby a predetermined amount of the weighing object in the weighing hopper main body 20 (the weighing object less than the target weight). ) Is fed into the large throw-in weighing hopper 21. The driving of the AC servo motor 14 described above is controlled by the instruction controller 71 using an AC servo driver 74.

  The large throw-in weighing hopper 21 is a hopper for weighing an object to be weighed less than a target weight from the weighing hopper body 20, weighing the supplied object to be weighed, and discharging the weighed object after weighing. As shown in FIG. 1, the large throw-in weighing hopper 21 includes a large throw-in weighing hopper body 21A and a pair of large throw-in weighing hopper gates 18A, 18B, and temporarily holds an object to be weighed supplied from the weighing hopper body 20, The objects to be weighed are discharged to the collective chute 22 arranged below.

  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. Load signals (electrical signals) output from the load cells LC1, LC2, LC3, and LC4 are sent to the instruction controller 71 via a known signal processing circuit (A / D converter, amplifier, filter, etc .; not shown). It is configured to be entered.

  As shown in FIG. 1, a collecting chute 22 is disposed below the large input weighing hopper 21, and a filling for filling an object to be weighed into a packaging machine (not shown) below the collecting chute 22. A chute 19 is further provided.

  The objects to be weighed discharged from the large throw-in weighing hopper 21 and the medium throw-in weighing unit 50 slide down on the collective chute 22 and are discharged from the small throw-in weighing unit 30 on the lower filling chute 19. Be with things. And it is sent to the packaging machine (not shown) from the discharge port (not shown) of the filling chute 19.

  As shown in FIG. 1, each of the large throw-in weighing hopper gates 18 </ b> A and 18 </ b> B is configured to be swingable to the left and right using a link portion having a known toggle mechanism. In other words, the link portion moves using the driving force of the rotary actuator 17 so that the large throw-in weighing hopper gates 18A and 18B are divided into left and right in FIG. The driving of the rotary actuator 17 is controlled by an instruction controller 71 as shown in FIG.

  That is, the large throw-in weighing unit 10 is provided with each part as described above, and the instruction controller 71 converts the weight of the object to be weighed in the large throw-in weighing hopper body 21A into output signals from the load cells LC1, LC2, LC3, LC4. Can be weighed on the basis. Furthermore, the instruction controller 71 can also receive a discharge permission signal for an object to be weighed from the packaging machine. When the instruction controller 71 receives this discharge permission signal, the large input weighing hopper gates 18A and 18B are controlled so that the discharge port of the large input weighing hopper 21 is opened, and the objects to be weighed after gathering are collected. Send to chute 22.

(Structure of the medium input weighing unit)
Next, the structure of the middle throw-in weighing unit 50 provided in the packer scale 100 of the present embodiment will be described. The packer scale 100 of the present embodiment includes a first medium input weighing unit 50A, a second medium input measurement unit 50B, a third medium input measurement unit 50C, and a fourth medium input measurement unit 50D as the medium input measurement unit 50. It is the composition which consists of. As shown in FIG. 2, on the left side of the packer scale 100, the first middle throwing weighing unit 50A, the second middle throwing weighing unit 50B, and the third middle throwing weighing unit 50C are arranged in series from the front side to the rear side. Has been. In addition, on the right side of the packer scale 100, a fourth medium throw-in weighing unit 50D is arranged on the front side.

  In addition, each of the first middle throwing weighing unit 50A, the second middle throwing weighing unit 50B, the third middle throwing weighing unit 50C, and the fourth middle throwing weighing unit 50D is a first middle throwing weighing hopper 64 as a middle throwing weighing hopper. , A second medium throw-in weighing hopper 65, a third medium throw-in weighing hopper 66, and a fourth medium throw-in weighing hopper 44 are provided. In these medium input weighing hoppers, the objects to be weighed whose weights are adjusted to have different ratios (volume ratios) are supplied. Of the plurality of medium throw-in weighing hoppers, the weighing object is determined based on the result of the combination calculation performed according to the difference between the weight of the object to be weighed by the large throw-in weighing hopper 21 and the target weight. An object to be weighed is discharged from a medium throw-in weighing hopper to be combined.

  For example, the combination calculation in the medium throw-in weighing hopper makes it possible to measure the weighing object in the small throw-in weighing unit 30 in addition to the difference between the weight of the weighing object measured by the large throw-in weighing hopper 21 and the target weight. For this reason, the minimum weight is obtained by subtracting the weight of the object to be weighed that needs to be supplied to the small input weighing unit 30.

  Each of the first middle throwing weighing unit 50A, the second middle throwing weighing unit 50B, the third middle throwing weighing unit 50C, and the fourth middle throwing weighing unit 50D has the same configuration. Therefore, in the following, only the configuration of the first middle throwing weighing unit 50A will be described as a representative, and the second middle throwing weighing unit 50B, the third middle throwing weighing unit 50C, and the fourth middle throwing weighing unit 50D will be described. Shall be omitted.

(Configuration of first medium charging weighing unit 50A)
First, in addition to FIG. 2 and FIG. 5 described above, the configuration of the first medium throw-in weighing unit 50A will be described with reference to FIG. FIG. 3 shows an example of the arrangement relationship of the first medium throw-in weighing unit 50A, the second medium throw-in weighing unit 50B, and the third medium throw-in weighing unit 50C when the packer scale 100 shown in FIG. 1 is viewed from the left. FIG.

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

  The first middle throwing chute 61 is a substantially cylindrical body standing upright in the vertical direction, and is configured such that an object to be weighed is discharged to the first middle throwing weighing hopper 64 from a discharge port provided at the lower end 61B. Has been. Further, the weighing hopper is connected via the hollow structure relay portion 60 connected to the left side surface of the weighing hopper main body 20 and the hollow first intermediate insertion branch portion 60A branched to the front side at the lower end portion of the relay portion 60. The main body 20 and the first middle charging chute 61 communicate with each other.

  In the case where the object to be weighed is not discharged from the lower end portion 61B of the first middle throwing chute 61 (for example, when the item to be weighed is temporarily held in the first middle throwing chute 61), the outlet provided in the lower end portion 61B. As shown in FIG. 3, the first intermediate insertion cut gate 54 can be used.

  The first middle throwing cut gate 54 opens and closes the discharge port in the first middle throwing chute 61, and can swing in the front-rear direction around the rotation shaft 51A.

  In other words, the first middle throwing cut gate 54 placed immediately below the discharge port of the first middle throwing chute 61 moves backward by rotating the rotary shaft 51A using the driving force of the rotary actuator 51. It moves to. Thus, the first middle throwing cut gate 54 moves rearward, so that the discharge port of the first middle throwing chute 61 is opened, and a predetermined amount of the object in the first middle throwing chute 61 is It is supplied into the first medium charging weighing hopper 64. 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 FIG.

  The first medium throw-in weighing hopper 64 measures the weight of the object to be weighed supplied from the first medium throw-in chute 61, temporarily holds the supplied object to be weighed, and the collective chute 22 disposed below the first object. It is intended to be discharged. The first middle throwing weighing hopper 64 includes a first middle throwing weighing hopper main body 64 </ b> A and a first middle throwing weighing hopper gate 67.

  Further, the first medium charging weighing hopper 64 is connected to and supported by the load cell LC5 fixed to the pedestal of the packer scale 100. The load signal (electrical signal) output from the load cell LC5 is input to the instruction controller 73 via a known signal processing circuit (A / D converter, amplifier, filter, etc.).

  A collecting chute 22 is disposed below the first medium charging weighing hopper 64. Then, the objects to be weighed discharged from the first medium throw-in weighing hopper 64 slide down on the collecting chute 22 and go to the filling chute 19 via the filling port (accommodating port) 16 at the lower part. Then, the object to be weighed is sent to a packaging machine (not shown) through the filling chute 19. The filling port 16 is an opening provided in the packaging machine in order to accommodate the objects to be weighed. The filling chute 19 guides the object to be weighed supplied through the filling port 16 to a predetermined filling position (not shown) in the packaging machine.

  The first intermediate charging weighing hopper gate 67 provided in the first intermediate charging weighing hopper 64 is configured to be opened and closed using a known toggle mechanism and the driving force of the rotary actuator 57. As shown in FIG. 5, the driving of the rotary actuator 57 is controlled by the instruction controller 73. In the present embodiment, the rotary actuator 57 is used as the drive device for the first medium throw-in weighing hopper gate 67, but the drive device is not limited to this. For example, a configuration using a stepping motor as the driving device may be used.

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

(Configuration of small input weighing unit)
Next, the small input weighing unit 30 of the packer scale 100 according to the present embodiment will be described in detail with reference to FIGS. 1, 2, 4, and 5. FIG. 4 is a diagram illustrating an example of an arrangement relationship between the fourth medium input weighing unit 50D and the small input measurement unit 30 when the packer scale 100 illustrated in FIG. 1 is viewed from the right side. In FIG. 4, members other than these parts are indicated by broken lines so that the arrangement relationship between the fourth medium input weighing unit 50 </ b> D and the small input measurement unit 30 as viewed from the right side becomes clear.

  Note that the packer scale 100 according to the present embodiment is characterized by the position where the small input weighing unit 30 is arranged. Further, the objects to be weighed from the small input weighing unit 30 are not discharged to the collective chute 22 like the large input weighing unit 10 and the medium input weighing unit 50 described above. It is also characterized by being discharged to an auxiliary chute 23 provided separately. The collective chute (first collective chute) 22 and the auxiliary chute (second collective chute) 23 form the collective chute of the present invention.

  Further, between the collective chute 22 and the auxiliary chute 23, an isolation wall 25 is provided so that the objects to be weighed discharged from the large throw-in weighing hopper 21 and the medium throw-in weighing hopper are not mixed into the loss-in hopper 42, respectively. Are physically separated. For this reason, in the packer scale 100 according to the present embodiment, it is possible to prevent the object to be weighed discharged from the large throw-in weighing hopper 21 and the medium throw-in weighing hopper from interfering with the loss-in hopper 42.

  Below, the structure of the small throw-in measurement part 30 is demonstrated.

  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. The small throw-in weighing unit 30 is arranged on the right side of the packer scale 100 behind the fourth medium throw-in weighing unit 50D.

  The loss-in charging chute 41 is a substantially cylindrical body standing in a substantially vertical direction, and is disposed at the lower end of the small charging branching portion 40A. The loss-in throwing chute 41 extends in the vertical direction at a predetermined distance from the connecting portion with the small throwing branch portion 40A (approximately the same distance as the fourth middle throwing chute 43 extends downward in the vertical direction). From there, it is inclined downward toward the front side. When the loss-in throwing chute 41 reaches the center line of the collective chute 22, it extends downward along the center line in the vertical direction. And the front-end | tip part (lower end part 41B) of this extending | stretching part is arrange | positioned so that it may enter in the auxiliary chute 23. FIG.

  That is, the loss-in charging chute 41 is bent from the lower end of the small charging branching portion 40A so that its lower end 41B is located on the center line of the collective chute 22 shown in FIG. Yes. And it is comprised so that to-be-measured object may be discharged | emitted by the loss-in hopper 42 from the discharge port provided in the lower end part 41B of the loss-in input chute 41. FIG.

  The weighing hopper main body is connected via a hollow-structure relay portion 40 connected to the right side surface of the weighing hopper main body 20 and a hollow structure small injection branch portion 40A branched to the rear side at the lower end portion of the relay portion 40. 20 and the loss-in charging chute 41 communicate with each other.

  Here, when the object to be weighed is not discharged from the lower end portion 41B of the loss-in charging chute 41 (for example, when the object to be weighed is temporarily held in the loss-in charging chute 41), the discharge port provided in the lower end portion 41B is shown in FIG. As shown in FIG. 6, the loss-in input gate 31 can be used to close the area.

  The loss-in input gate 31 opens and closes the discharge port in the loss-in input chute 41, and can swing in the left-right direction about the rotation shaft 34A.

  That is, the loss-in insertion gate 31 placed immediately below the discharge port of the loss-in insertion chute 41 moves backward to the right as the rotary shaft 34A rotates using the driving force of the rotary actuator 34. As the loss-in charging gate 31 moves in this manner, the discharge port of the loss-in charging chute 41 is opened, and a predetermined amount of the weighing object in the loss-in charging chute 41 is supplied into the loss-in hopper 42. 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 a hopper that discharges the object to be weighed while performing loss-in weighing in order to compensate for the difference between the target weight and the weight of the object to be weighed discharged from the large input weighing hopper 21 and the medium input weighing hopper. The loss-in hopper can compensate for the difference from the target weight by fine adjustment. The loss-in hopper 42 is disposed in the auxiliary chute 23 at a position near the filling port (accommodating port) 16 below the fourth medium charging weighing hopper 44 and on the center line of the collecting chute 22 in FIG. . That is, the loss-in hopper 42 is disposed at a position closer to the packaging machine to which the objects to be weighed are supplied than the large throw-in weighing hopper 21 and the medium throw-in weighing hopper.

  The loss-in hopper 42 has a substantially cylindrical shape standing in the vertical direction. That is, the loss-in charging chute 41 and the loss-in hopper 42 are arranged side by side in the vertical direction on the center line of the collective chute 22. The object to be weighed discharged from the loss-in input chute 41 is supplied to the upper end portion 42A of the loss-in hopper 42, and the object to be weighed is discharged to the auxiliary chute 23 from the discharge port provided in the lower end portion 42B of the loss-in hopper 42. .

  The auxiliary chute 23 is provided on the right side of the collective chute 22 and communicates through a chute opening 24 formed in the collective chute 22. For this reason, the objects to be weighed discharged to the auxiliary chute 23 are discharged to the filling port 16 provided at the lower end portion of the collective chute 22 via the chute opening 24.

  Here, when the object to be weighed is not discharged from the lower end portion 42B of the loss-in hopper 42 (for example, when the object to be weighed is temporarily held in the loss-in hopper 42), the discharge port at the lower end portion 42B is connected to the loss-in discharge gate 32 (auxiliary hopper). It can be closed using.

  More specifically, the loss-in discharge gate 32 is configured to be swingable in the left-right direction around the rotation shaft 35A. Therefore, the loss-in discharge gate 32 placed immediately below the discharge port provided at the lower end portion 42B of the loss-in hopper 42 moves back to the right as the rotary shaft 35A rotates using the driving force of the rotary actuator 35. It moves to.

  As the loss-in discharge gate 32 moves to the right as described above, the discharge port provided in the lower end portion 42B of the loss-in hopper 42 is opened, and the object to be weighed in the loss-in hopper 42 is supplied to the auxiliary chute 23. The driving of the rotary actuator 35 is controlled by an instruction controller 72 as shown in FIG.

  The loss-in hopper 42 is connected to and supported by the load cell LC8 fixed to the pedestal of the packer scale 100. The load signal (electrical signal) output from the load cell LC8 is well-known signal processing. It is configured to be input to the instruction controller 72 through a circuit (A / D converter, amplifier, filter, etc .; not shown).

  Moreover, in the packer scale 100 of this embodiment, when the instruction | indication controller 72 receives the discharge permission signal of the to-be-measured item from a packaging machine, it will open the discharge port provided in the lower end part 42B of the loss-in hopper 42. To the loss-in discharge gate 32. When the loss-in discharge gate 32 moves in response to this instruction and the discharge port provided at the lower end portion 42B of the loss-in hopper 42 is opened, the object to be weighed in the loss-in hopper 42 is based on the output signal from the load cell LC8. Loss-in discharge. 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 the object to be weighed can be sent to the auxiliary chute 23 within a predetermined time.

(Configuration of instruction controller)
Next, the structure which concerns on the measurement control of the to-be-measured object in the packer scale 100 which concerns on this Embodiment is demonstrated. First, the configuration of an instruction controller that performs weighing control of an object to be weighed will be described.

  In the packer scale 100 according to the present embodiment, the weighing control is performed by the instruction controllers 71, 72, and 73.

  The instruction controllers 71, 72, and 73 include, for example, a calculation unit (not shown) including a microcontroller, an MPU, a PLC (Programmable Logic Controller), a logic circuit, etc., and a memory unit (not shown) such as a ROM or RAM. ), A display unit (not shown) including a weight display unit, a message display unit, and the like, and a key input unit (not shown) through which an operator can input various data.

  In this embodiment, as shown in FIG. 5, the instruction controllers 71, 72, 73 cooperate with each other to perform the metering control, but the present invention is not limited to this. For example, the configuration may be such that the metering control is not performed by a plurality of controllers of the instruction controllers 71, 72, and 73 but the metering control is performed by a single controller.

  As described above, the instruction controller 71 controls the operation of the actuators (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. It is. Further, the instruction controller 71 receives output signals from the load cells LC1, LC2, LC3, and LC4 that support the large throw-in weighing hopper 21, and based on this output signal, the instruction controller 71 holds the load signal held in the large throw-in weighing hopper 21. It also calculates the weight of the weighing object.

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

  As described above, the instruction controller 73 includes the first, second, third, and fourth middle insertion cut gates 54, 55, 56, and 37, and the first, second, third, and fourth middle insertion metering. It is a controller that controls the operation of actuators (rotary actuators 51, 52, 53, and 36, and rotary actuators 57, 58, 59, and 39) for opening and closing hopper gates 67, 68, 69, and 38. In addition, the instruction controller 73 outputs 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. A signal is received, and the weights of the respective objects to be weighed in the first, second, third, and fourth middle input weighing hoppers 64, 65, 66, 44 are calculated based on these output signals.

  Further, the instruction controller 73 also performs a combination calculation by the first, second, third, and fourth medium throw-in weighing hoppers 64, 65, 66, and 44. That is, in the packer scale 100 according to the present embodiment, the large input of the object to be weighed into the large input weighing unit 10, the medium input of the object to be weighed into the plurality of medium input weighing units 50 having different volume ratios, By weighing the object to be weighed into the small input weighing unit 30, the weight of the object to be weighed approximates the target weight. The instruction controller 73 performs a process for obtaining a combination closest to a desired weight, that is, a combination calculation, from among a plurality of combinations of the objects to be weighed that are input to the middle input weighing unit 50 having different volume ratios. More specifically, the instruction controller 73 performs a combination calculation based on the weights of the four objects to be weighed that are adjusted to different volume ratios (ratio), and the total weight of the objects to be weighed is the combined target weight. The first, second, third, and fourth intermediate input weighing hoppers 64, 65, 66, and 44 that are closest to the combination are obtained, and the objects to be weighed by the intermediate input weighing hopper selected as the combination target are gathered chute 22 is discharged.

(Weighing control on packer scale)
The metering control performed under the control instructions of the instruction controllers 71, 72, and 73 described above will be described below with reference to FIGS. 6 and 7 show an example of a charging operation, a weighing operation, and a discharging operation related to the weighing control of the object to be weighed in the packer scale 100 according to the embodiment of the present invention.

  FIG. 6 is a time chart showing an example of the opening / closing timing of each gate used in the packer scale 100 of the present embodiment. Moreover, FIG. 7 is a figure which shows an example of the injection | throwing-in operation | movement concerning the measurement control of the to-be-measured object in the packer scale 100 of this invention, measurement operation | movement, and discharge | emission operation | movement, The figure (a) is FIG. 3 is a time chart showing an example of the timing of the input and discharge of an object to be weighed by the packer scale. FIG. 7B is a graph showing an example of the change over time of the input (discharge) weight of the object to be weighed by the packer scale 100 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, and 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 are inserted 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 input operation, the weighing operation, and the discharge operation is completed, an operation start button (not shown) of the packer scale 100 is pressed, whereby the instruction controllers 71, 72, 73 are Based on the control program for executing the operation of each part of the scale 100, the following operation is executed while controlling each part of the packer scale 100.

  First, in the large throw-in weighing unit 10 in FIG. 6, the 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 instruction controller 71 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 to thereby adjust the volume input weight of the object to be weighed into the large input weighing hopper 21. MB can be adjusted to a weight slightly lower than the target weight MT of the object to be weighed (for example, about 98% of the target weight MT) based on the bulk density of the object to be weighed. In other words, in the packer scale 100 of the present embodiment, the instruction controller 71 uses the large throw-in cut gates 15A, 15B directly above the large throw-in weighing hopper 21 to provide an appropriate amount less than the target weight MT to the large throw-in weighing hopper 21. An object to be weighed (volume input weight MB) is supplied by timer filling. When the measurement stabilization waiting time T1 in the load cells LC1, LC2, LC3, and LC4 elapses, the instruction controller 71 calculates the volume input weight MB based on the output signals from the load cells LC1, LC2, LC3, and LC4. To do. Thereby, the instruction controller 71 calculates 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 (FIG. 7B). Reference) can be determined, and the optimal combination of the first, second, third, and fourth medium input weigh hoppers 64, 65, 66, and 44 can be selected.

  Thereafter, as shown in FIG. 6, the instruction controller 71 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 by volume. .

  Further, in the first middle throw-in weighing unit 50A of FIG. 6, the first middle throw-in cut gate 54 moves to move the first medium throw-in while the volume of the object to be weighed is being loaded into the large throw-in weighing hopper 21. The discharge port of the chute 61 is opened. As a result, 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 instruction controller 73 adjusts the input weight S1 of the object to be weighed into the first medium input weighing hopper 64 by controlling the opening time of the discharge port of the first medium input chute 61. That is, the input weight S1 here is a weight adjusted at a predetermined ratio based on the bulk density of the object to be weighed. When the weighing stabilization waiting time T2 in the load cell LC5 elapses, the instruction controller 73 obtains the actual input weight S1 of the object to be measured based on the output signal from the load cell LC5.

  When the instruction controller 73 selects the first medium input weighing hopper 64 as a combination target based on the combination calculation after obtaining the input weight S1, the first timely (for example, immediately after the measurement stabilization waiting time T1 elapses) The middle charging weighing hopper gate 67 is moved to open the discharge port of the first middle charging weighing hopper 64. In this manner, the objects to be weighed are selectively discharged from the discharge port of the first medium charging weighing hopper 64.

  Further, in the third middle throw-in weighing unit 50C, as shown in FIG. 6, the third middle throw-in cut gate 56 moves while the volume of the object to be weighed is being loaded into the large throw-in weighing hopper 21. The discharge port of the third medium charging chute 63 is opened. As a result, the object to be weighed in the third middle throwing chute 63 is thrown into the third middle throwing weighing hopper 66 (supplied).

  At this time, the instruction controller 73 controls the opening time of the discharge port of the third middle throwing chute 63, thereby calculating the weight S2 of the weighing object to the third middle throwing weighing hopper 66 and the volume of the weighing object. Based on the density, the weight can be adjusted to a predetermined ratio (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 instruction controller 73 obtains the actual input weight S2 of the object to be weighed based on the output signal from the load cell LC7.

  After the input weight S2 is obtained, when the instruction controller 73 selects the third medium input weighing hopper 66 as a combination target based on the combination calculation, the third timely (for example, immediately after the measurement stabilization waiting time T1 elapses) The middle charging weighing hopper gate 69 is moved to open the discharge port of the third middle charging weighing hopper 66. In this way, the objects to be weighed are selected and discharged from the discharge port of the third medium input weighing hopper 66.

  Further, as shown in FIG. 6, in the second medium throw-in weighing unit 50B, the second medium throw-in cut gate 55 moves while the object to be weighed is being loaded into the large throw-in weighing hopper 21. Then, the outlet of the second middle charging chute 62 is opened. As a result, the object to be weighed in the second middle throwing chute 62 is thrown into (supplied) into the second middle throwing hopper 65.

  At this time, the instruction controller 73 controls the opening time of the discharge port of the second middle throwing chute 62, so that the weighing weight S3 of the weighing object to the second middle throwing weighing hopper 65 is determined. Based on the density, the weight is adjusted to a predetermined ratio (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 T4 in the load cell LC6 elapses, the instruction controller 73 obtains the actual input weight S3 of the object to be measured based on the output signal from the load cell LC6.

  After the input weight S3 is obtained, when the instruction controller 73 selects the second medium input weighing hopper 65 as a combination target based on the combination calculation, the second timely (for example, immediately after the measurement stabilization waiting time T1 elapses) The middle charging weighing hopper gate 68 is moved to open the discharge port of the second middle charging weighing hopper 65. In this way, the objects to be weighed are selectively discharged from the discharge port of the second medium charging weighing hopper 65.

  Further, in the fourth medium throw-in weighing unit 50D, as shown in FIG. 6, the fourth medium throw-in cut gate 37 moves while the volume of the object to be weighed is being loaded into the large throw-in weighing hopper 21. The outlet of the fourth middle charging chute 43 is opened. As a result, the object to be weighed in the fourth middle throwing chute 43 is thrown into the fourth middle throwing weighing hopper 44 (supplied).

  At this time, the instruction controller 73 controls the opening time of the discharge port of the fourth middle throwing chute 43 so that the weight S4 to be weighed into the fourth middle throwing hopper 44 is calculated as the volume of the weighing object. Based on the density, the weight is adjusted to a predetermined ratio (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 instruction controller 73 obtains the actual input weight S4 of the object to be measured based on the output signal from the load cell LC7.

  After the input weight S4 is obtained, when the instruction controller 73 selects the fourth medium input weighing hopper 44 as a combination target based on the combination calculation, the fourth timely (for example, immediately after the measurement stabilization waiting time T1 elapses) The middle charging weighing hopper gate 38 is moved to open the discharge port of the fourth middle charging weighing hopper 44. In this way, the objects to be weighed are selected and discharged from the discharge port of the fourth medium input weighing hopper 44.

  Further, in the small input metering unit 30, as shown in FIG. 6, the loss-in input chute 41 is used to open the discharge port of the loss-in input chute 41 as shown in FIG. As a result, the object to be weighed in the loss-in charging chute 41 is lost-in (supplied) into the loss-in hopper 42.

  At this time, the instruction controller 72 monitors the output signal from the load cell LC8 that supports the loss-in hopper 42, and the weight of the object to be weighed into the loss-in hopper 42 is equal to the insufficient weight of the object to be weighed (for example, in the previous cycle). When it reaches the weight used), the discharge port of the loss-in input chute 41 is closed using the loss-in input gate 31. When the weighing stability waiting time T7 in the load cell LC8 at the time of loss-in input elapses, the instruction controller 72 uses the loss-in discharging gate 32 to discharge the loss-in hopper 42 in a timely manner (for example, immediately after the weighing stabilization waiting time T1 elapses). The outlet is opened, and a small amount (for example, less than the input weight S1) of the weighing object is lost-in discharged from this discharge port while calculating the loss-in weighing of the weighing object based on the output signal from the load cell LC8.

  After the loss-in discharge, the weighing object in the loss-in loading chute 41 is again loaded (supplied) into the loss-in hopper 42 after the weighing stabilization waiting time (for example, the weighing stability waiting time T6) in the load cell LC8 has elapsed. .

  In the packer scale 100 having the above-described configuration, the timing of volume input (timer filling) of the object to be weighed into the large input weighing hopper 21, the first, second, third, and fourth medium input weighing hoppers 64, 65, At least a pair of charging timings among the timings of loading the objects to be weighed into each of 66 and 44 and the timing of loss-in loading of the objects to be weighed into the loss-in hopper 42 are configured to overlap. . For example, in the example shown in FIG. 6, the timing of 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 and 44 are configured so as to overlap with the timing of putting the object to be weighed into each of them.

  Further, the first, second, third and fourth intermediate insertion cut gates 54, 55, 56 and 37 are opened almost simultaneously, and when adjusted to the input weights S1, S2, S3 and S4, respectively, in a timely manner. It is configured to close.

  Thus, in the packer scale 100 of the present embodiment, the processing time related to the weighing process in the packer scale 100, more specifically, the time of one cycle of charging, weighing, and discharging can be shortened.

  Furthermore, 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 timing for selecting and discharging the combination of objects overlaps the timing for discharging the objects to be weighed from the loss-in hopper 42.

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

  Also, using the timer filling of the objects to be weighed by the large input cut gates 15A and 15B of the large input weighing unit 10, an appropriate amount of the objects to be weighed (for example, 95% or more), the volume of the large input weighing hopper 21 can be quickly adjusted. Can be thrown in.

  Furthermore, as shown in FIG. 7, the packer scale 100 is configured such that the first, second, third, and fourth intermediate charging hopper gates 67 when the weighing stabilization waiting time T1 in the load cells LC1, LC2, LC3, LC4 has elapsed. , 68, 69, 38 and the loss-in discharge gate 32 are immediately opened. Further, when closing each of the first, second, third, and fourth middle charging hopper gates 67, 68, 69, 38, the first, second, third, and fourth middle charging cut gates 54, 55, Each of 56 and 37 is also configured to start opening already.

  Since the packer scale 100 is configured as described above, the processing time related to the weighing process, more specifically, the time of one cycle of charging, weighing and discharging can be shortened.

  Further, as described above, the packer scale 100 has different ratios of the weights of the objects to be weighed (in this case, input weight S1: input weight S2: input weight S3: input weight S4 = 1: 2: 4: 8 ratio weight). The objects to be weighed so as to satisfy the above are supplied to the first, second, third, and fourth medium input weighing hoppers 64, 65, 66, and 44, respectively. And it is the structure which performs the combination calculation based on the weight of each to-be-measured object in the 1st, 2nd, 3rd, and 4th throwing-in weighing hoppers 64, 65, 66, and 44.

  When the weighing stability waiting time T1 in the load cells LC1, LC2, LC3, LC4 elapses after the volume of the object to be weighed into the large throw-in weighing hopper 21, the instruction controller 71 supports the large throw-in weighing hopper 21. The volume input weight MB is obtained based on output signals from the load cells LC1, LC2, LC3, and LC4.

  Thus, the combination target weight used for the combination calculation is set based on the target weight MT of the object to be weighed, the volume input weight MB of the object to be weighed, and the loss-in discharge weight MR of the object to be weighed. 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 is set as the combination target weight.

  As described above, the packer scale 100 is configured to use high-precision loss-in discharge to finally adjust the weight of the object to be measured to the target weight MT, so that the object weighing accuracy (cut accuracy) is high. Can be maintained. Further, in the packer scale 100, the total weight of the objects to be weighed among the first, second, third, and fourth middle input weighing hoppers 64, 65, 66, and 44 is the largest combined target weight. This is a configuration for obtaining a combination of the first, second, third, and fourth medium throw-in weighing hoppers 64, 65, 66, and 44 that are close to each other. Then, the objects to be weighed are selectively discharged from the medium charging weighing hopper selected as the combination target.

  By the way, in the packer scale 100 according to the present embodiment, as described above, the small input weighing unit 30 uses the loss-in discharge gate 32 to open the discharge port of the loss-in hopper 42 and based on the output signal from the load cell LC8. While performing the calculation of the loss-in weighing of the object to be weighed, a small amount of the object to be weighed is discharged from this discharge port. On the other hand, the large throw-in weighing unit 10 is configured to open the discharge port of the large throw-in weighing hopper 21 using the large throw-in weighing hopper gates 18A and 18B, and discharge the object to be weighed from the discharge port. Further, the middle throw-in weighing unit 50 is configured to move the middle throw-in weighing hopper gate to open the discharge port of the middle throw-in weighing hopper and selectively discharge the objects to be weighed.

  That is, the small input weighing unit 30 is configured to discharge the object to be weighed while performing loss-in weighing, but the large input weighing unit 10 and the medium input weighing unit 50 each discharge the object to be measured by opening and closing the gate. It is a configuration. For this reason, the former takes longer to discharge than the latter. Therefore, as shown in FIG. 7A, even if the volume discharge in the large input weighing unit 10, the combination selective discharge in the medium input weighing unit 50, and the loss-in discharge in the small input weighing unit 30 are started simultaneously, the loss-in discharge Since the time required for this becomes longer than other discharge processes, the weighing cycle time of the object to be weighed (one cycle time related to the weighing process) becomes longer by the increased amount. Conversely, if the time required for the loss-in discharge can be shortened, the weighing cycle time can be shortened by the shortened time.

  Here, the packer scale 100 according to the present embodiment has a characteristic configuration in that the loss-in discharge gate 32 is disposed in the vicinity of the filling port 16 as shown in FIGS. In other words, the large throw-in weighing hopper gates 18A and 18B, the first medium throw-in weighing hopper gate 67, the second medium throw-in weighing hopper gate 68, the third medium throw-in weighing hopper gate 69, and the fourth medium throw-in weighing hopper gate 38 are located. The distance to the filling port 16 is shorter at the position where the loss-in discharge gate 32 is disposed.

  For this reason, the large throw-in weighing hopper gates 18A and 18B, the first medium throw-in weighing hopper gate 67, the second medium throw-in weighing hopper gate 68, the third medium throw-in weighing hopper gate 69, and the fourth medium throw-in weighing hopper gate 38 are lost at the same height position. Compared with the configuration in which the discharge gate 32 is disposed (a general loss-in discharge configuration), the distance by which the discharged weighing object falls by its own weight and reaches the filling port 16 can be shortened. For this reason, as shown in FIGS. 7A and 7B, the packer scale 100 according to the present embodiment can shorten the time required for loss-in discharge by T8 as compared with a general loss-in discharge configuration. it can. That is, one cycle time related to the weighing process can be shortened by T8.

  In the small input weighing unit 30, a loss-in hopper 42, a loss-in input gate 31, a loss-in discharge gate 32 and the like are accommodated in the auxiliary chute 23. For this reason, the weighing targets discharged from the large throw-in weighing hopper gates 18A and 18B, the first medium throw-in weighing hopper gate 67, the second medium throw-in weighing hopper gate 68, the third medium throw-in weighing hopper gate 69, and the fourth medium throw-in weighing hopper gate 38, respectively. It is possible to prevent objects from being scattered and mixed into the loss-in hopper 42. Also, the objects to be weighed discharged from the large throw-in weighing hopper gates 18A and 18B, the first medium throw-in weighing hopper gate 67, the second medium throw-in weighing hopper gate 68, the third medium throw-in weighing hopper gate 69, and the fourth medium throw-in weighing hopper gate 38, respectively. Can be prevented from accumulating in the vicinity of the filling port 16 below the collecting chute 22 and being buried in the small input weighing unit 30 (the loss-in hopper 42, the loss-in input gate 31, the loss-in discharge gate 32, etc.).

  As described above, in this embodiment, the loss-in hopper 42, the loss-in input gate 31, the loss-in discharge gate 32, and the like are accommodated in the auxiliary chute 23. For this reason, it is positioned below the large throw-in weighing hopper gates 18A and 18B, the first medium throw-in weighing hopper gate 67, the second medium throw-in weighing hopper gate 68, the third medium throw-in weighing hopper gate 69, and the fourth medium throw-in weighing hopper gate 38. Can do.

  In the packer scale 100 according to the present embodiment, the auxiliary chute 23 for housing the loss-in hopper 42, the loss-in charging gate 31, the loss-in discharging gate 32, and the like is provided separately from the collective chute 22. However, the present invention is not limited to this configuration. For example, it is discharged from each of the large throw-in weighing hopper 21 and the medium throw-in weighing hopper (the first medium throw-in weighing hopper 64, the second medium throw-in weighing hopper 65, the third medium throw-in weighing hopper 66, and the fourth medium throw-in weighing hopper 44). Alternatively, the isolation wall 25 may be formed in the collecting chute 22 so that the objects to be weighed are scattered and mixed, or are not filled with objects to be weighed near the filling port 16. As described above, the space in which the object to be weighed is discharged from the loss-in hopper 42 and the space in which the object to be weighed is discharged from each of the large input weighing hopper 21 and the medium input weighing hopper by the isolation wall 25 provided in the collecting chute 22. And may be physically separated.

  Further, the packer scale 100 according to the present embodiment has a configuration in which an object to be weighed is fed into the packaging machine via one filling port 16 and a filling chute 19. However, the present invention is not limited to this configuration. For example, a filling port and a filling chute are newly provided separately from the filling port 16 and the filling chute 19, and only the parts to be weighed discharged from the loss-in discharge gate 32 are passed through the newly provided filling port and the filling chute. The structure sent to a packaging machine may be sufficient.

  In this way, in the case of a configuration in which a filling port and a filling chute are newly provided, the object to be weighed discharged from the filling chute 19 can be sent to the packaging machine via a different route for the object to be weighed in lost-in. Can be reduced. For this reason, the quantity of the to-be-measured object collected in the filling port 16 vicinity can be reduced.

  From the foregoing description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and / or function may be substantially changed without departing from the spirit of the invention.

  ADVANTAGE OF THE INVENTION According to this invention, the measuring device which shortens the measurement cycle concerning the measurement process of a to-be-measured object is obtained. 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 input measurement part 19 Filling chute 20 Weighing hopper main body 21 Large input measurement hopper 22 Collecting chute 23 Auxiliary chute 24 Chute opening 25 Separation wall 30 Small input measurement part 41 Loss-in input chute 42 Loss-in hopper 44 4th medium input measurement hopper 50 Medium Input weighing section 50A First medium charging weighing section 50B Second medium charging weighing section 50C Third medium charging weighing section 50D Fourth medium charging weighing section 64 First medium charging weighing hopper 65 Second medium charging weighing hopper 66 Third medium charging Weighing hopper 100 packer scale

Claims (4)

A large input weighing hopper that is supplied with an object to be weighed less than the target weight, weighs the object to be weighed, and discharges the object to be weighed after weighing,
Based on the result of the combination calculation performed according to the difference between the weight of the object to be weighed by the large input weighing hopper and the target weight. A plurality of medium throw-in weighing hoppers for discharging the object to be weighed;
A loss-in hopper that discharges the object to be weighed while performing loss-in weighing in order to compensate for the difference between the target weight and the weight of the object to be weighed discharged from the large input weighing hopper and the medium input weighing hopper. ,
The loss-in hopper is a weighing device arranged closer to the supply destination of the discharged weighing object than the large throw-in weighing hopper and the medium throw-in weighing hopper. The weighing apparatus according to claim 1, wherein the loss-in hopper is disposed in the vicinity of a storage port, which is an opening provided in the supply destination for storing the discharged object to be measured. A set chute for collecting the discharged objects to be weighed and supplying to the supply destination;
The said collection chute has an isolation wall for isolating this loss-in hopper so that the to-be-measured object discharged | emitted from each of the said large throw-in weighing hopper and the medium throw-in weighing hopper may not enter into the said loss-in hopper. The metering device described.   The collective chutes are separated from the first collective chutes for collecting the objects to be weighed discharged from the large throw-in weighing hopper and the medium throw-in weighing hopper, and separated from the first collective chutes by the isolation wall, and are discharged by the loss-in hopper. The weighing apparatus according to claim 3, further comprising a second collective chute that guides the measured object to the supply destination.

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