JP6115993B2 - Combination scale - Google Patents

Description

 The present invention relates to a combination weigher.

  The combination weigher includes a vibratory supply device that supplies an object to be weighed, and supplies the object to be weighed from the supply device to the conical central portion of the dispersion feeder, and the dispersion feeders are radially installed around the periphery. The objects to be weighed are conveyed to a plurality of linear feeders, and the plurality of linear feeders put the objects to be weighed into a plurality of supply hoppers. The plurality of supply hoppers temporarily hold the objects to be weighed, and the objects to be weighed are supplied to the plurality of weighing hoppers arranged below the weighing hoppers. The weighing hopper combination selected by this combination is obtained by calculating the combination based on the weighing value and calculating the combination of the weighing hoppers that is closest to or equal to the target combination weight. It discharges | emits and throws into a packaging machine through a gathering chute (for example, refer patent document 1).

JP 2012-173092 A

  In the combination weigher described above, when the object to be weighed is a highly adhesive object to be weighed, the object to be weighed is placed on the transport surface of the supply feeder, which is a supply device that supplies the object to be weighed to the dispersion feeder by vibration. Is easy to adhere. As the adherence of the objects to be weighed advances, the objects to be weighed cannot be sufficiently conveyed from the supply feeder to the dispersion feeder, leading to a decrease in weighing accuracy and weighing speed as a combination weigher. Moreover, if adhesion is intense, conveyance of the to-be-measured object will stop.

  For this reason, the operator periodically stops the supply feeder and cleans the supply feeder, so that the operating rate of the combination weigher decreases and the burden on the operator increases.

  The present invention has been made in view of the above-described circumstances, and allows an object to be weighed with high tackiness to be released even if it adheres to the conveyance surface of the supply apparatus, The purpose is to reduce the decline in operating rate.

  In order to achieve the above object, the present invention is configured as follows.

(1) The combination weigher of the present invention is a combination weigher provided with a vibration-type supply device that supplies an object to be weighed to a dispersion unit that conveys the object to be measured to the surroundings.
A detection unit for detecting an amount of an object to be weighed in the dispersion unit;
A control unit that controls driving of the supply device based on the detection output of the detection unit;
When it is determined that the amount of the object to be measured detected by the detection unit is insufficient in driving the supply device at a preset driving time and vibration intensity, the control unit determines the driving time and / or the vibration. Drive the supply device with increased strength ,
When the control unit determines that the amount of the object to be measured detected by the detection unit is insufficient even if the driving with the increased driving time and / or the vibration intensity is performed a predetermined number of times, the vibration intensity is determined. The supply device is driven with a maximum value .

  When it is determined that the amount of the weighing object detected by the detection unit is insufficient, for example, the amount of the weighing object detected by the detection unit is equal to or less than a predetermined amount, or is detected by the detection unit. When it is determined that the amount of an object to be weighed is below a predetermined range.

It is preferable that the driving time and / or the time for increasing the vibration intensity and the vibration intensity can be set in advance.
It is preferable that the maximum amplitude intensity can be selected and set in advance according to the type of the object to be weighed.

  Driving of the supply device with increased driving time and / or vibration intensity may be performed a preset number of times or until the amount of the object to be measured detected by the detection unit reaches a predetermined amount. .

  In addition, when the driving of the supply device with increased driving time and / or vibration intensity is performed a plurality of times set in advance, a time interval at which it can be determined whether or not the object to be weighed attached to the supply device has been released. Is preferably performed, and when it is determined that the amount of the object to be measured detected by the detection unit after the adhesion is released reaches a predetermined amount and does not become insufficient, the original driving time and vibration intensity set in advance are determined. Then, the supply device may be driven.

According to the combination weigher of the present invention, even when the supply device is driven with a preset drive time and vibration intensity, the amount of the object to be weighed in the dispersion unit does not reach the predetermined amount, and it is determined that the supply amount of the object to be weighed is insufficient. When the operation is performed, it is assumed that a highly sticky object to be weighed starts to adhere to the conveying surface of the supply device and is not sufficiently supplied to the dispersion unit, so that the drive time and / or vibration intensity is increased. It becomes possible to release the adhesion of the object to be weighed as the conveying force becomes stronger and smoothly convey the object to be weighed to the dispersing portion.
Further, according to the present invention, when the adhesion formation of a highly sticky object advances on the conveying surface of the supply device and the adhesion formation is not canceled even after a predetermined number of times of driving with increased driving time and vibration intensity, the supply is performed. By setting the vibration intensity of the apparatus to the maximum vibration intensity, the attached state of the object to be weighed attached to the conveying surface of the supply apparatus can be released at once.

 (2) In another embodiment of the combination weigher of the present invention, the dispersion unit is a dispersion feeder that conveys an object to be measured to the surroundings, and is arranged around each of the dispersion feeders to be covered from the dispersion feeder. A plurality of rectilinear feeders that respectively convey the weighing object by vibration, and a plurality of linear feeders that are arranged corresponding to the respective rectilinear feeders, hold the objects to be weighed from the respective rectilinear feeders, and supply the held objects to be measured downward And a plurality of weighing hoppers arranged corresponding to the respective supply hoppers, holding the objects to be weighed supplied from each of the supply hoppers, and weighing the weight of the held objects to be weighed, The control unit performs a combination calculation based on a measurement value of an object to be weighed by the weighing hopper, and the detection unit calculates an average value of the number of weighing hoppers selected by the combination calculation. Zui and indirectly detects the amount of the objects to be weighed in the dispersion feeder.

  When the objects to be weighed are stably conveyed from the supply device to the dispersion feeder and there are not enough objects to be weighed on the dispersion feeder, the objects to be weighed are transferred from the dispersion feeder to each weighing hopper via the linear feeder and the supply hopper. Since an appropriate amount is supplied, the average value of the number of weighing hoppers selected in the combination calculation is within a predetermined range. On the other hand, when the objects to be weighed adhere to the conveying surface of the supply device, the objects to be weighed are not sufficiently conveyed to the dispersion feeder, and there are not enough objects to be weighed on the dispersion feeder, the linear feeder from the dispersion feeder, Since the amount of objects to be weighed supplied to each weighing hopper via the supply hopper is reduced, the average value of the number of weighing hoppers selected in the combination calculation becomes larger than the predetermined range. That is, the amount of objects to be weighed in the dispersion feeder can be indirectly detected by the average value of the number of weighing hoppers selected by the combination calculation.

  According to this embodiment, when it is determined that the supply amount of the objects to be weighed supplied from the supply device to the dispersion unit is insufficient based on the average value of the number of weighing hoppers selected by the combination calculation, the adhesiveness is high. If the object to be weighed begins to adhere to the conveying surface of the supply device and is not sufficiently supplied to the dispersing unit, it is driven by increasing the driving time and / or vibration intensity to release the object to be weighed, and the dispersing unit It is possible to smoothly transport the object to be measured.

 (3) In the embodiment of (2) above, when the average value of the number of weighing hoppers selected by the combination calculation is equal to or greater than the first threshold value, the control unit sets the preset driving time and vibration intensity. The driving time and / or the vibration intensity is increased to drive the supply device, and when the average value of the number of weighing hoppers selected by the combination calculation is equal to or less than a second threshold value, the preset driving The supply device is driven by reducing the driving time and / or the vibration intensity with respect to time and vibration intensity.

  As described above, when the objects to be weighed are stably supplied from the supply device to the dispersion feeder and there is no shortage of objects to be weighed on the dispersion feeder, each weighing hopper passes through the linear feeder and the supply hopper from the dispersion feeder. Since an appropriate amount of the object to be weighed is supplied to the first, the average value of the number of weighing hoppers selected in the combination calculation is within a predetermined range. Therefore, the first threshold value is set to a value exceeding the upper limit value of the predetermined range. The threshold value is preferably set to a value lower than the lower limit value of the predetermined range.

  According to this embodiment, when the average value of the number of weighing hoppers selected by the combination calculation is as large as the first threshold value or more, a highly sticky object to be weighed adheres to the conveying surface of the supply device and is distributed to the dispersion feeder. Since there are not enough objects to be weighed in the dispersion feeder and there are not enough objects to be weighed to each weighing hopper, the driving time and / or vibration strength of the feeding device is increased and this is driven. As a result, the conveying force of the supply device is strengthened, the adhesion of the object to be weighed is released, and the object to be weighed can be smoothly conveyed to the dispersion feeder.

  In addition, when the average value of the number of weighing hoppers selected by the combination operation is as small as the second threshold value or less, too many objects to be weighed are supplied to the dispersion feeder, so that the objects to be weighed supplied to each weighing hopper are If there is too much, it is possible to reduce the drive time and / or vibration intensity of the supply device and drive the supply device to an appropriate amount to the dispersion feeder.

( 4 ) In another embodiment of the present invention, it is provided with a notifying unit for notifying that the object to be weighed is not supplied to the dispersing unit, and the control unit drives the supplying unit that maximizes the vibration intensity. If it is determined that the amount of the object to be measured detected by the detection unit is insufficient even after a predetermined number of times, the notification unit is driven to notify.

  According to this embodiment, when the vibration intensity of the supply device is maximized and the adherence state of the object to be weighed attached to the conveyance surface of the supply device cannot be released even after being driven a predetermined number of times, this is notified to the operator. Therefore, the worker can release the adhesion of the object to be weighed by cleaning the supply device.

( 5 ) In a preferred embodiment of the combination weigher of the present invention, the supply device supplies the object to be weighed in a reservoir hopper in which the object to be weighed is accumulated to the dispersing portion, and the object to be weighed in the reservoir hopper A supply device detection unit for detecting the amount of the supply device, and the control unit detects the supply when the amount of the object to be weighed in the reservoir hopper is equal to or less than a predetermined amount based on the detection output of the supply device detection unit. Control to drive the device is not performed.

  According to this embodiment, if the amount of the objects to be weighed in the reservoir hopper is equal to or less than a predetermined amount, the objects to be weighed cannot be supplied to the dispersion unit even if the supply device is driven. I am trying not to.

  According to the present invention, an object to be weighed with high adhesion adheres to the conveying surface of the supply device, and the object to be weighed cannot be sufficiently conveyed to the dispersion part, and the amount of the object to be weighed in the dispersion part is insufficient. If it is determined that the feeding device is driven, the feeding time and / or vibration intensity of the feeding device is increased, so that the feeding force of the feeding device is strengthened and the object to be weighed is released, and the weighing object is smoothly fed to the dispersion unit. Can be transported.

FIG. 1 is an external view of a combination weigher according to an embodiment of the present invention. FIG. 2 is a block diagram showing a schematic configuration of the combination weigher. FIG. 3 is a flowchart used for operation control of the combination weigher. FIG. 4 is a flowchart showing details of supply feeder control of FIG. FIG. 5 is a diagram showing a setting screen of the operation setting display section of the combination weigher.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an external view of a combination weigher according to one embodiment of the present invention. The combination weigher 1 of this embodiment includes a supply feeder 4 as a vibration type supply device that supplies an object to be weighed stored in a reservoir hopper 3 in the upper center of the combination weigher body 2. Under the reservoir hopper 3, a supply feeder detection sensor 7 including a photoelectric sensor or the like for detecting the amount of the object to be weighed is provided.

  The combination weigher main body 2 includes a conical dispersion feeder 8 that radially disperses the objects to be weighed supplied from the supply feeder 4 by vibration, and a plurality of supply hoppers by vibrating the objects to be weighed sent from the dispersion feeder 8 by vibration. A plurality of rectilinear feeders 9 to be transported to 10, a plurality of supply hoppers 10 that temporarily hold objects to be weighed from the respective rectilinear feeders 9, and a plurality of weighing hoppers to which the objects to be weighed are respectively supplied from the supply hoppers 10 11 and a collecting chute 12 for discharging the objects to be weighed from each weighing hopper 11 to the packaging machine 5.

  Each weighing hopper 11 is connected to a weight sensor (not shown) such as a load cell that measures the weight of an object to be weighed in the weighing hopper 11, and the measured value by each weight sensor 10 is sent to a control device (not shown) described later. Is output, and the control device performs a combination operation.

  In this embodiment, the amount of the objects to be weighed supplied from the supply feeder 4 to the dispersion feeder 8 is measured by a weight sensor (not shown) for the dispersion feeder supporting the dispersion feeder 8, and the measured value is controlled. Given to the device.

  The setting operation for the control device is performed by the operation setting display unit 6, and this operation setting display unit 6 is configured by using, for example, a touch panel, etc., and performs operation of the combination weigher and setting of its operation parameters, and the operation speed. , Combination weighing value etc. are displayed on the screen. An alarm light 6a is provided in the vicinity of the operation setting display unit 6, and when the object to be weighed firmly adheres to the conveying surface of the supply feeder 4 as will be described later and the adhesion is not released by this alarm light 6a, Notify that.

  The supply feeder 4 supplies the objects to be weighed in the reservoir hopper 3 to the dispersion feeder 8 by vibrations. In the case of a highly sticky object to be weighed, the feeding surface of the supply feeder 4, i.e., made of stainless steel. The object to be weighed adheres to the surface of the trough, and a required amount of object to be weighed cannot be transported from the supply feeder 4 to the dispersion feeder 8, resulting in a decrease in weighing accuracy and weighing speed as a combination weigher.

  Therefore, in this embodiment, it is detected whether or not the supply amount of the objects to be weighed from the supply feeder 4 to the dispersion feeder 8 is insufficient. When it is determined that the supply amount is insufficient, the drive time of the supply feeder 4 and The vibration intensity (amplitude intensity) is driven by increasing the normal driving time and vibration intensity set in advance. As a result, the object to be weighed attached to the conveying surface of the supply feeder 4 is peeled off from the conveying surface and conveyed to the dispersion feeder 8.

  Even when the supply feeder 4 with the drive time and vibration intensity increased from normal is driven a predetermined number of times, if a shortage of the supply amount of the object to be weighed from the supply feeder 4 to the dispersion feeder 8 is detected, the vibration intensity is maximized. The supply feeder 4 is driven over a driving time set to the vibration intensity of the above, and this is continuously performed a plurality of times.

  As a result, the object to be weighed formed on the conveyance surface of the supply feeder 4 is vibrated with the maximum vibration intensity, peeled off at a stretch, and conveyed to the dispersion feeder 8.

  In this embodiment, whether or not the amount of the objects to be weighed supplied from the supply feeder 4 to the dispersion feeder 8 is insufficient is determined based on the average value of the number of the weighing hoppers 11 selected by the combination calculation. Judging so.

  That is, in the combination weigher, in order to increase the combination accuracy, it is important to perform a combination calculation by putting an appropriate amount of objects to be weighed into the weighing hopper 11. When the total number of weighing hoppers 11 is n, when n is an odd number, the target combination weight is divided by (n-1) / 2 or (n + 1) / 2, and when n is an even number, the target combination If control is performed so that an object to be weighed having a weight value obtained by dividing the weight by n / 2 is input to the weighing hopper 11, the number of effective combinations increases, and the combination accuracy is improved.

  The amount of the object to be weighed into the weighing hopper 11 includes the amount of the object to be weighed on the dispersion feeder 8, the vibration intensity and driving time of the dispersion feeder 8, the vibration intensity of the linear feeder 9 around the dispersion feeder 8, and The number of effective combinations is increased and the combination accuracy is improved.

  Therefore, when the objects to be weighed are stably supplied to the supply hopper 11, the number of the weighing hoppers selected by the combination calculation is n when the total number of the weighing hoppers 11 is n and n is an odd number. (N-1) / 2, or (n + 1) / 2, when n is an even number, the number is the number before and after n / 2.

  For example, when the total number n of the weighing hoppers 11 is 10, control is performed so that five weighing hoppers 11 are selected by the combination calculation. In this case, the number of the weighing hoppers 11 selected by the combination calculation is A predetermined range of 4, 5, or 6 is preferable with 5 at the center. For example, when the number of weighing hoppers 11 selected by the combination calculation is as large as 7 or more, the amount of the objects to be weighed supplied to each weighing hopper 11 is too small, and conversely, the number of weighing hoppers 11 selected. However, when it is as small as 3 or less, for example, the amount of the objects to be weighed supplied to each weighing hopper 11 is too large.

  In this embodiment, the average value of the number of weighing hoppers 11 selected by the combination calculation is calculated, and when the average value is greater than or equal to the first threshold value, the objects to be weighed supplied to the dispersion feeder 8 are insufficient. Therefore, assuming that there are too few objects to be weighed supplied to each weighing hopper 11, the driving time and vibration strength of the supply feeder 4 are increased from the preset normal driving time and vibration strength as described above. Drive.

  On the contrary, when the average value of the number of the weighing hoppers 11 selected by the combination calculation is smaller than the second threshold value, the objects to be weighed supplied to the dispersion feeder 8 are too much, so that the weighing hoppers 11 are supplied to each weighing hopper 11. Assuming that there are too many objects to be weighed, the driving time and vibration intensity of the supply feeder 4 are driven to be lower than the preset normal driving time and vibration intensity.

  FIG. 2 is a block diagram showing a schematic configuration of the control system of the combination weigher in this embodiment, and the same reference numerals are given to the portions corresponding to FIG.

  As shown in FIG. 2, the control device 22 is an A / D to which detection outputs of a CPU unit 22a as a calculation control unit, a memory unit 22g, a weight sensor 20 of the weighing hopper 11 and a weight sensor 21 for the distributed feeder are given. 22 d of conversion circuit parts, the gate drive circuit part 22c which drives the gate for discharge | emission of the supply hopper 10 and the measurement hopper 11, the vibration control circuit part 22b which controls the vibration of each feeder 4,8,9, and the packaging machine 5 An I / O circuit unit 22f connected to the I / O circuit unit, an I / O circuit unit 22e to which a detection output of a supply feeder detection sensor 7 for detecting the amount of an object to be weighed in the reservoir hopper 3 conveyed by the supply feeder 4 is provided. It has.

  The CPU unit 22a as a calculation control unit controls each unit and performs combination calculation. The memory unit 22g stores an operation program for the combination weigher, operation parameters to be set, and the like, and serves as a work area for operations on the CPU unit 22a.

  The A / D conversion circuit unit 22d is supplied from the above-described dispersion feeder weight sensor 21 for detecting the weight of the object to be weighed on the dispersion feeder 8 and each weight sensor 20 for detecting the weight of the object to be weighed in each weighing hopper 11. The analog signal is converted into a digital signal and output to the CPU unit 22a. Further, a detection output from the supply feeder detection sensor 7 that detects the amount of the object to be weighed in the storage hopper 3 is given to the CPU section 22a via the I / O circuit section 22e.

  The gate drive circuit unit 22c controls opening and closing of the discharge gates of the supply hopper 10 and the weighing hopper 11 based on a control signal from the CPU unit 22a. The vibration control circuit unit 22b controls the respective vibration operations of the supply feeder 4, the dispersion feeder 8, and each linear feeder 9 based on a control signal from the CPU unit 22a. The CPU unit 22a is connected to the operation setting display unit 6 so as to communicate with each other.

  The control device 22 controls the operations of the supply feeder 4 and the entire combination weigher by the CPU unit 22a executing the operation program stored in the memory unit 22g.

  In the combination weigher, it is necessary to set a large number of operation parameters for performing the operation as described above, and the setting is performed by the operator using the operation setting display unit 6, and the set operation parameter value is the CPU unit. 22a and stored in the memory unit 22g. The operation parameters include the target combination weight, which is a target value in the combination calculation, and an allowable range thereof, the vibration intensity (vibration amplitude) and driving time (one vibration duration) of each of the feeders 4 and 8, and the above-described shortage There are the number of detections and the maximum vibration intensity.

  FIG. 3 is a flowchart for explaining the entire processing operation of the combination weigher of this embodiment. With reference to this flowchart, the control operation by the control unit 22 is set in the setting screen of the operation setting display unit 6 in FIG. It explains together.

  Prior to the description of the flowchart, the setting screen of the operation setting display unit 6 will be described.

  This setting screen is a setting screen for the supply feeder 4 and includes “supply amount shortage detection count”, “supply amount shortage detection time”, “maximum vibration strength”, “drive time at maximum vibration strength”, “maximum vibration”. There are six setting items of “number of times of driving with intensity” and “number of times of cumulative addition”.

  Hereinafter, each setting item will be described in the corresponding step of the flowchart.

  As shown in FIG. 3, first, the control device 9 controls the driving of the supply feeder 4 as described later on the basis of the detection output of the weight sensor 21 for the dispersion feeder and the like to be weighed on the dispersion feeder 8. Supply feeder control for controlling the supply of goods is performed (step s1).

  Next, dispersion feeder control is performed to control the drive of the dispersion feeder 8 to disperse the objects to be weighed on the dispersion feeder 8 to the surroundings and to supply the objects to be measured to the linear feeder 9 (step s2).

  Next, the linear feeder control is performed by controlling the driving of the linear feeder 9 to drive the linear feeder 9 corresponding to the empty supply hopper 10 to supply the objects to be weighed on the linear feeder 9 to the empty supply hopper 10. Perform (step s3).

  Next, the operation shifts to supply hopper control (step s4), the discharge gate of the supply hopper 10 corresponding to the empty weighing hopper 11 is opened, and the object to be weighed is supplied to the empty weighing hopper 11, and step s5. Move on.

  In step s 5, when an object to be weighed is supplied to the weighing hopper 11, the corresponding weight sensor 20 measures the weight of the object to be weighed supplied to the weighing hopper 11 and takes the measured value into the control device 22. Perform weighing control.

  Next, a combination calculation is performed based on the weight of the objects to be weighed supplied to the weighing hopper 11, and the combined weight, which is the total weight of various combinations of the weights of the objects to be weighed, is equal to the target combined weight, or Then, an optimum combination that is a combination of the weighing hoppers 11 having a predetermined weight that is heavier than the target combination weight and close to the target combination weight is selected (step s6). Thereafter, it is determined whether or not a discharge request signal is input from the packaging machine 5 (step s7). When a discharge request signal is input, the discharge of the weighing hopper 11 of the optimum combination selected by the combination calculation is performed. The gate is opened, and the weighing hopper control for discharging the object to be weighed is performed (step s8).

  Next, processing for supply feeder control is performed.

  That is, in step s9, whether or not the detection output of the supply feeder detection sensor 7 is ON, that is, whether or not the object to be weighed conveyed by the supply feeder 4 in the reservoir hopper 3 has accumulated a predetermined amount or more. If it is determined and ON, since a predetermined amount or more of the objects to be weighed are accumulated in the reservoir hopper 3, the process proceeds to step s10. If it is not ON in step s9, an alarm process or the like indicating that there are few objects to be weighed in the reservoir hopper 3 is performed and the process returns to step s1. In this case, there is no object to be fed in the reservoir hopper 3, so supply The feeder 4 is not driven.

  In step s10, the number of weighing hoppers 11 selected by the combination calculation is cumulatively added, and in step s11, "1" is added to the cumulative addition number of the number of weighing hoppers 11.

  In step s12, it is determined whether or not the cumulative number of additions has reached a predetermined number. This predetermined number corresponds to the “cumulative addition number” on the setting screen of FIG. 5 and is 5 in this example.

  When the cumulative number of additions reaches a predetermined number in step s12, the process proceeds to step s13, and if it does not reach the predetermined number, the process returns to step s1. In step s13, the cumulative addition value / cumulative addition count is calculated, and the average value of the number of weighing hoppers 11 selected in the combination calculation is calculated.

  In step s14, the cumulative addition value and the cumulative addition count are reset to “0”.

  In step s15, it is determined whether the average value is large. In step s21, it is determined whether the average value is small.

  As described above, the number of weighing hoppers 11 selected by the combination calculation is controlled so that five weighing hoppers 11 are selected by the combination calculation when the total number of the weighing hoppers 11 is 10, for example. In this case, the number of weighing hoppers 11 selected by the combination calculation is preferably 4, 5, or 6 centering on 5, and the number of weighing hoppers 11 selected is the first threshold value. For example, when the number is 7 or more, it is determined to be large, and conversely, the number of selected weighing hoppers 11 is determined to be small when the number is the second threshold value, for example, 3 or less.

  In step s15, as described above, it is determined whether or not the average value of the number of selected weighing hoppers is large. If it is determined that the average value is large, the process proceeds to step s16. When the average value is large, the object to be weighed adheres to the conveying surface of the supply feeder 4, the amount of the object to be weighed supplied from the supply feeder 4 to the dispersion feeder 8 decreases, and is supplied to the weighing hopper 11. Since the weight of the object to be weighed is small and insufficient, in step s16, the setting of the driving time for driving the supply feeder 4 is increased from the normal setting, and the process proceeds to step s17. In step s17, the setting of the vibration intensity of the supply feeder 4 is increased from the normal setting, and the process proceeds to step s18. One of step s16 and step s17 may be omitted.

  In step s18, “1” is added to the number of supply shortage detections to determine whether the number of supply shortage detections has reached a predetermined value, that is, “supply amount” on the setting screen of the operation setting display unit 6 in FIG. It is determined whether or not the number of shortage detection times has reached 5 in this example (step s19). If it is determined in step s19 that the number of supply shortage detection has reached a predetermined value, even if the drive time and vibration intensity are increased more than usual and the supply feeder 4 is driven, the supply shortage has not been resolved. “Maximum vibration strength drive flag” is set to “ON” (step s20).

  On the other hand, if it is determined in step s15 that the average value is not large, the process proceeds to step s21 to determine whether or not the average value is small. If it is determined in step s21 that the average value is small, the process proceeds to step s22. If it is determined that the average value is not small, the process returns to step s1.

  When the average value is small, the amount of the objects to be weighed supplied from the supply feeder 4 to the dispersion feeder 8 is large, and the weight of the objects to be weighed supplied to the weighing hopper 11 is large. The drive time setting is decreased from the normal setting. In step s23, the vibration intensity setting of the supply feeder 4 is decreased from the normal setting. In step s24, the supply amount shortage detection count is reset to “0”. .

  FIG. 4 is a flowchart showing details of the supply feeder control in step s1 of FIG. 3, and FIGS. 3 and 4 are so-called multitask processes for switching tasks.

  In step s101, it is determined whether or not the “maximum vibration intensity driving flag” is “ON”. Here, in order to distinguish it from the “maximum vibration strength drive flag” in step s20 of FIG. 3, “medium” is included in the name. When the “maximum vibration strength driving flag” is “ON”, the supply feeder 4 is oscillating at the maximum vibration strength.

  If the “maximum vibration intensity driving flag” is not “ON” in step s101, the process proceeds to step s108.

  In step s108, it is determined whether or not the “maximum vibration intensity drive flag” is “ON”. In step s19 in the flowchart of FIG. 3, if “the number of insufficient supply detection” has reached 5 times and “maximum vibration strength drive flag” is set to “ON” in step s20, step s108 proceeds to step s109, If the “maximum vibration intensity drive flag” is not set to “ON” in s20, the process proceeds from step s108 to step s115.

  In step s115, it is determined whether or not the “supply feeder driving flag” is “ON”. The “supply feeder driving flag” is a flag indicating that the supply feeder 4 is being driven. If the “supply feeder driving flag” is not set to “ON”, the process proceeds from step s115 to step s120.

  In step s120, it is determined whether or not the amount of the objects to be weighed on the dispersion feeder 8 is equal to or lower than the lower limit value. This determination is made based on the detection output of the weight sensor 21 for the distributed feeder. When the amount of the objects to be weighed on the dispersion feeder 8 is less than or equal to the lower limit value, the process proceeds to step s121, the “supply feeder driving flag” is set to “ON”, and the driving time measuring timer is set in step s122 to set the driving time. Measurement is started, the vibration strength of the supply feeder 4 is set in step s123, and the supply feeder 4 is driven with the vibration strength in step s124. The vibration intensity and driving time of the supply feeder 4 are the normal vibration intensity and driving time set in advance, the vibration intensity and driving time set in steps s16 and S17 in FIG. 3, or the step in FIG. Either of the vibration intensity and the driving time set in s22 and 23.

  If the “maximum vibration intensity driving flag” is not “ON” in step s101, the process proceeds to step s108, and it is determined in step s108 whether the “maximum vibration intensity driving flag” is “ON”. If the “maximum vibration strength drive flag” is not set to “ON” in step s20 of FIG. 3, it is determined as NO and the process proceeds to step s115.

  In step s115, if the “supply feeder driving flag” is set to “ON” in step s121, it is determined as YES, and the process proceeds to step s116. In step s116, it is determined whether or not the driving time measurement timer has expired. If it is determined in step s117 that the drive time measurement timer has timed up, the process moves to step s118, and in step s118, the vibration of the supply feeder 4 is stopped, and in step s119, the “supply feeder driving flag” is set to “OFF”.

  If the “maximum vibration intensity driving flag” is not “ON” in step s101, the process proceeds to step s108, and it is determined whether or not the “maximum vibration intensity driving flag” is “ON” in step s108. If the “maximum vibration intensity drive flag” is set to “ON” in step s20 of step 3, YES is determined, and the process proceeds to step s109.

  In step s109, the “maximum vibration intensity driving flag” is set to “ON”, and in step s110, the number of times of driving at the maximum vibration intensity is reset to “0”.

  In step s111, the “maximum vibration intensity drive flag” is set to “OFF”, and the process proceeds to step s112. In step s112, the vibration intensity of the supply feeder 4 is set to the maximum vibration intensity, the drive time measurement timer is set in step s113, the supply feeder 4 is turned “ON” in step s114, and the supply feeder 4 is driven with the maximum vibration intensity. To do. The maximum vibration intensity in step s112 corresponds to “maximum vibration intensity” on the setting screen in FIG. 5 and is “99” in this example. Further, the time-up time of the driving time measurement timer in step s113 corresponds to “driving time at the maximum vibration intensity” on the setting screen of FIG. 5, and is “1500 msec” in this example.

  If the “maximum vibration intensity driving flag” is set to “ON” in step s109, it is determined in step s101 that the “maximum vibration intensity driving flag” is “ON”, and the process proceeds to step s102.

  In step s102, the time-up time of the driving time measurement timer is decreased, and the process proceeds to step s103. In step s103, it is determined whether or not the driving time measurement timer has expired. If it is determined in step s103 that the time has expired, in step s104, driving of the supply feeder 4 is stopped, and the process proceeds to step s105.

  In step s105, “1” is added to the number of times the supply feeder 4 is driven at the maximum vibration intensity, and the process proceeds to step S106.

  In step s106, it is determined whether the number of times of driving at the maximum vibration intensity has reached a predetermined value. This predetermined value corresponds to “the number of times of driving at the maximum vibration intensity” on the setting screen of FIG. 5, and is “3” times in this example. If it is determined in step s106 that the number of times of driving at the maximum vibration intensity is a predetermined value, the process proceeds to step s107, and in step s107, the “maximum vibration intensity driving flag” is set to “OFF”. If it is determined in step s106 that the number of times of driving at the maximum vibration intensity is not a predetermined value, the process proceeds to step s112. In step s112, the vibration intensity of the supply feeder 4 is set to the maximum vibration intensity, and in step s113. A drive time measuring timer is set, and the supply feeder 4 is turned “ON” in step s114 to drive the supply feeder 4 with the maximum vibration intensity.

  As described above, if it is determined that the supply amount of the objects to be weighed from the supply feeder 4 to the dispersion feeder 8 is insufficient based on the average value of the number of the weighing hoppers 11 selected by the combination calculation, the adhesive Since it is assumed that a highly reliable object to be weighed adheres to the conveying surface of the supply feeder 4, the drive time and vibration intensity of the supply feeder 4 are increased from normal, so that the object to be weighed is released and the dispersion feeder is released. 8 can supply an object to be weighed.

  Further, even when the driving time and the vibration intensity of the supply feeder 4 are increased more than usual, when the shortage of the supply amount is repeated a predetermined number of times, the formation of the object to be weighed on the conveyance surface of the supply feeder 4 proceeds. In this case, the supply feeder 4 is driven a predetermined number of times with the maximum vibration intensity, so that the object to be weighed attached to the supply feeder 4 can be forcibly peeled off and the object to be weighed can be supplied to the dispersion feeder 8.

  In addition, the supply feeder 4 is driven a predetermined number of times with the maximum vibration intensity in order to peel off the object to be weighed attached to the supply feeder 4, but this is the addition of drive control by the control device 22, so-called It can be realized by adding control software. On the other hand, in order to peel off an object to be weighed attached to the supply feeder 4, for example, a hammer device that applies a forced vibration by hitting a trough of the supply feeder 4 or a vibration that swings the supply feeder 4 left and right. It is conceivable to newly install a separate device such as a vibrating device. However, installing such a separate device increases the cost. The present invention can be realized only by adding control software without installing a separate device.

  Furthermore, since it is possible to set the number of insufficient supply detections, the maximum vibration intensity, the drive time, and the like, it is possible to select appropriate values according to the ease of attachment of the object to be weighed.

  In the above embodiment, the “supply amount shortage detection time” on the setting screen of FIG. 5 is not used. However, as another embodiment of the present invention, instead of the above “supply amount shortage detection count”, “supply amount shortage” is used. The “shortage detection time” may be used.

  In the above-described embodiment, whether or not the supply amount of the objects to be weighed to the dispersion feeder 8 is insufficient is determined based on the average value of the number of weighing hoppers selected by the combination calculation. As an embodiment, the supply amount of the object to be weighed on the dispersion feeder 8 may be detected by the weight sensor 21 for the dispersion feeder. For example, the object to be weighed on the dispersion feeder may be detected by an ultrasonic sensor or a photoelectric sensor. The thickness (layer thickness) or amount may be detected.

  In this case, when the object to be weighed on the dispersion feeder 8 becomes a predetermined amount or less, the object to be weighed on the dispersion feeder 8 is required even if the supply feeder 4 is driven with a normal driving time and vibration intensity. When the amount does not reach the required amount, the driving time and the vibration intensity are increased as in the above-described embodiment, and when the required amount is not reached, the supply feeder 4 may be driven with the maximum vibration intensity.

DESCRIPTION OF SYMBOLS 1 Combination weigher 2 Combination weigher body 3 Reservoir hopper 4 Supply feeder 5 Packing machine 6 Operation setting display part 8 Dispersion feeder 9 Linear feeder 10 Supply hopper 11 Weighing hopper 12 Collecting chute

Claims (5)

A combination weigher provided with a vibration type supply device for supplying an object to be weighed to a dispersion unit that conveys the object to be measured to the surroundings,
A detection unit for detecting an amount of an object to be weighed in the dispersion unit;
A control unit that controls driving of the supply device based on the detection output of the detection unit;
When it is determined that the amount of the object to be measured detected by the detection unit is insufficient in driving the supply device at a preset driving time and vibration intensity, the control unit determines the driving time and / or the vibration. Drive the supply device with increased strength ,
When the control unit determines that the amount of the object to be measured detected by the detection unit is insufficient even if the driving with the increased driving time and / or the vibration intensity is performed a predetermined number of times, the vibration intensity is determined. Driving the feeding device with a maximum of
A combination weigher characterized by that. The dispersion unit is a dispersion feeder that conveys an object to be measured to the surroundings,
A plurality of rectilinear feeders which are respectively arranged around the dispersion feeder and respectively convey objects to be weighed from the dispersion feeder by vibration;
A plurality of supply hoppers arranged corresponding to each linear feeder, holding the objects to be weighed from the respective linear feeders, and supplying the objects to be weighed downward;
A plurality of weighing hoppers arranged to correspond to the respective supply hoppers, holding the objects to be weighed supplied from the respective supply hoppers, and weighing the weights of the held objects to be weighed,
The control unit performs a combination calculation based on a measurement value of an object to be weighed by the weighing hopper,
The detection unit indirectly detects the amount of an object to be weighed in the dispersion feeder based on an average value of the number of weighing hoppers selected by the combination calculation;
The combination weigher according to claim 1. When the average value of the number of weighing hoppers selected by the combination calculation is equal to or greater than a first threshold, the control unit sets the driving time and / or the vibration strength to be higher than the preset driving time and vibration strength. Increase the drive of the feeding device,
When the average value of the number of weighing hoppers selected by the combination calculation is less than or equal to a second threshold value, the supply time is reduced by reducing the drive time and / or the vibration intensity from the preset drive time and vibration intensity. Drive,
The combination weigher according to claim 2. A notification unit for notifying that the object to be weighed is not supplied to the dispersion unit;
When the control unit determines that the amount of the object to be measured detected by the detection unit is insufficient even if the supply device that maximizes the vibration intensity is driven a predetermined number of times, the control unit Drive to inform,
The combination weigher according to any one of claims 1 to 3. The supply device is for supplying an object to be weighed in a reservoir hopper in which an object to be weighed is stored, to the dispersion unit.
A supply device detector for detecting the amount of an object to be weighed in the reservoir hopper;
The control unit does not perform control for driving the supply device when the amount of the object to be weighed in the reservoir hopper is equal to or less than a predetermined amount based on the detection output of the supply device detection unit.
The combination weigher according to any one of claims 1 to 4.

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