JP6005400B2 - Vibration conveying apparatus, combination weigher, and driving method of vibration conveying apparatus - Google Patents

Description

The present invention relates to a vibration conveying device that conveys an article by vibration , a combination weigher using the same, and a driving method of the vibration conveying device .

  The combination weigher variously combines the weighing values of the objects to be weighed in the plurality of weighing hoppers to which the objects to be weighed are supplied, and among these combinations, the combined weight that is the total weight is equal to the combination target weight or The closest combination is selected, and the objects to be weighed are discharged from the weighing hopper of the selected combination to a packaging machine or the like.

  In such a combination weigher, in general, an object to be weighed is supplied to a dispersion feeder at the upper center of the combination weigher by a supply device. In the dispersion feeder, the objects to be weighed are dispersed and conveyed to a plurality of linear feeders arranged radially around the dispersion feeder. A vibration feeder such as a rectilinear feeder includes a vibration device including an electromagnet, a movable body, a leaf spring, and the like, and an article loading unit such as a trough that is vibrated by the vibration device. Then, by intermittently applying a voltage to the electromagnet, the article loading portion, for example, the trough is vibrated by utilizing the attractive force of the electromagnet and the repulsive force based on the spring action of the leaf spring, and the measurement target on the trough The goods are conveyed and supplied to the corresponding supply hopper.

  As a method of driving the vibration feeder, a method of repeatedly applying a drive pulse to an electromagnet (see, for example, Patent Document 1), or an AC voltage from a commercial AC power source is controlled by firing angle control, such as an SSR (solid state relay). There is a method of applying to an electromagnet via a switching element (see, for example, Patent Document 2).

  The conveyance amount of the object to be weighed by the vibration feeder is controlled by the driving time of the vibration device that vibrates the trough and the vibration amplitude of the trough. The vibration amplitude of the trough is controlled by the pulse width of the drive pulse for the electromagnet or the conduction time corresponding to the firing angle.

  In the combination weigher, the setting unit sets the driving time (ms) of the vibration device and the amplitude intensity corresponding to the vibration amplitude of the trough as the operation parameters of the vibration feeder. The set value of the amplitude intensity is usually a numerical value corresponding to an electric signal given to the electromagnet of the vibration device. For example, when the vibration amplitude of the trough is controlled by the pulse width of the driving pulse, the maximum pulse width is divided into 99 equal parts, and this maximum pulse width is set with 100-step amplitude intensity from 0 to 99. For example, the pulse width when the amplitude intensity 50 is set is five times the pulse width when the amplitude intensity 10 is set.

JP 2011-112386 A Japanese Patent Laid-Open No. 9-2335016

  Ideally, the vibration amplitude of the article loading portion such as the trough of the vibration feeder is proportional to the set amplitude intensity. However, for example, even if the pulse width of the drive pulse is proportional to the set amplitude intensity, the set amplitude intensity is proportional to the vibration amplitude of the actual loading part of the vibration feeder due to a mechanical element such as a leaf spring. For this reason, there is a case where the vibration amplitude of the actual article loading portion of the vibration feeder changes greatly even though the setting of the amplitude intensity is slightly changed, and the conveyance amount can be easily adjusted by the vibration feeder. There is a problem that is not.

  Therefore, in Patent Document 1 described above, the vibration amplitude of the article loading section is detected by feedback control of the pulse width of the drive pulse so that the vibration amplitude of the article loading section is the target amplitude. The disagreement is resolved.

  However, in Patent Document 1, it is necessary to attach a sensor for detecting the vibration amplitude of the article loading portion to each of the plurality of vibration feeders of the combination weigher, and the vibration amplitude to be detected is only a few millimeters. Therefore, it takes time to install and adjust the sensor. Furthermore, when the article to be conveyed contains powder or oil, there is a problem that the sensor must be frequently cleaned.

  The present invention has been made paying attention to such a situation, does not require a sensor for detecting the vibration amplitude of the vibration feeder, and sets the vibration amplitude of the vibration feeder and the vibration amplitude of the actual vibration feeder. The purpose is to make them as proportional as possible.

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

(1) The vibration conveying device of the present invention includes a vibration feeder that vibrates an article loading unit on which an article is loaded and conveys the article, a setting unit that sets an amplitude of vibration of the vibration feeder, and setting of the setting unit A drive control unit that controls driving of the vibration feeder according to a value, and the drive control unit includes a memory that stores correction data, and is set by the setting unit based on the correction data The drive signal of the vibration feeder is corrected so that the setting value and the amplitude of the vibration feeder are proportional to each other, and the correction data includes a plurality of setting values set by the setting unit and each setting. This is data based on a plurality of measured amplitudes of the vibration feeder measured corresponding to the values.

  The proportional relationship between the setting value set by the setting unit and the amplitude of the vibration feeder is such that when the setting unit sets a minimum setting value, for example, “0”, the amplitude of the vibration feeder is “0”. It is preferable not to vibrate.

  The set value set by the setting unit and the amplitude of the vibration feeder are preferably completely proportional, but may be proportional at least in part. For example, when the set value and the amplitude are taken as orthogonal coordinates, a straight line showing a proportional relationship in which the origin of the set value “0” and the amplitude “0” passes through the maximum set value becomes a predetermined amplitude. On the other hand, at least 3 points, preferably 4 points or more, in the entire set range of the set values may coincide. More preferably, it is sufficient to match over at least a part of the entire set range.

  The maximum deviation amount of the amplitude in the non-proportional part (the part deviating from the straight line), that is, the ideal amplitude (amplitude on the straight line) and the actual amplitude of the vibration feeder when proportional The ratio of the maximum difference (maximum deviation amount) to the ideal amplitude is within 40%, preferably within 30%, more preferably within 20%, and even more preferably within 10%.

  The partial range that coincides with the straight line is 20% or more, preferably 30% or more, more preferably 40% or more, and still more preferably 50% with respect to the entire setting range of the set value. It is the above range. The partial range may be continuous or may be divided into a plurality of ranges.

  Preferably, the drive control unit stores correction data and a correction formula in advance, and reads or calculates the correction signal according to the setting value set by the setting unit to correct the drive signal.

  For this correction data and correction formula, set a plurality of setting values in advance in the setting unit, measure the actual amplitude of the vibration feeder corresponding to each setting value, and the measured amplitude is proportional to the setting value in the setting unit It is preferable to ask.

  According to the vibration transfer device of the present invention, even if the setting value of the vibration amplitude of the vibration feeder by the setting unit and the vibration amplitude of the actual vibration feeder are not proportional due to a mechanical element or the like, The vibration feeder drive signal is corrected so that the vibration amplitude of the vibration feeder is proportional to the actual vibration amplitude, so even though the set value does not match the actual vibration amplitude or the set value is slightly changed, It is possible to prevent the vibration amplitude of the vibration feeder from changing greatly.

  (2) In a preferred embodiment of the vibration conveyance device of the present invention, the drive signal is a drive voltage pulse for the vibration feeder, and the drive control unit corrects a pulse width of the drive voltage pulse.

  According to this embodiment, it is possible to correct the pulse width of the drive voltage pulse for the vibration feeder so that the set value of the setting unit is proportional to the vibration amplitude of the actual vibration feeder.

  (3) In another preferable embodiment of the vibration conveyance device of the present invention, the drive signal is an AC voltage supplied to the vibration feeder via a switching element, and the drive control unit Correct the arc angle.

  According to this embodiment, the firing angle of the switching element is corrected to correct the application time of the AC voltage to the vibration feeder, and the setting value of the setting unit and the amplitude of vibration of the actual vibration feeder are proportional to each other. can do.

  (4) In another embodiment of the vibration conveyance device of the present invention, the drive control unit corrects the setting value set by the setting unit so as to be proportional to the amplitude of the vibration feeder, and the corrected setting is performed. The drive signal is corrected according to the value.

  According to this embodiment, the setting value set by the setting unit is corrected, the drive signal is corrected according to the corrected setting value, and the setting value of the setting unit is proportional to the vibration amplitude of the actual vibration feeder. Can be corrected.

  (5) The combination weigher of the present invention includes a dispersion feeder that disperses an object to be weighed supplied from a supply device to the periphery, and an object to be weighed that is disposed around the dispersion feeder and is dispersed by the dispersion feeder. A plurality of linear feeders that respectively convey, and a plurality of supply units that are arranged corresponding to the respective linear feeders, hold a workpiece to be carried out from the linear feeder, and supply the held workpiece to the lower side A plurality of measuring units arranged corresponding to the respective supply units, holding the objects to be weighed supplied from the respective supply units, and measuring the weight of the held objects to be weighed; A combination weigher including a control unit that performs a combination operation based on a measurement value of an object to be weighed, and at least one of the dispersion feeder and the rectilinear feeder includes the vibration conveyance device of the present invention.

According to the combination weigher of the present invention, the setting value of the vibration amplitude of the vibration feeder such as the linear feeder by the setting unit and the vibration amplitude of the actual vibration feeder are not proportional to each other due to mechanical elements or the like. The drive signal of the vibration feeder is corrected so that the value is proportional to the vibration amplitude of the actual vibration feeder, so the set value does not match the actual vibration amplitude or the set value is slightly changed. Therefore, it is possible to prevent the vibration amplitude of the actual vibration feeder from changing greatly, which makes it easy to adjust the set amount of the setting unit and adjust the conveyance amount by the vibration feeder.
(6) The driving method of the vibration conveyance device of the present invention includes a vibration feeder that conveys an article by vibrating an article loading portion on which the article is loaded, a setting unit that sets an amplitude of vibration of the vibration feeder, and the setting A drive method of a vibration conveying device comprising a drive control unit for controlling the drive of the vibration feeder according to a set value of the unit,
Each setting value is set by the setting unit, and each amplitude of vibration of the vibration feeder corresponding to each setting value is measured,
Based on each of the plurality of setting values and each amplitude of vibration of the vibration feeder measured corresponding to each setting value, the setting value set by the setting unit and the amplitude of the vibration feeder are Find correction data to correct proportionally,
The obtained correction data is stored in the memory of the drive control unit,
Based on the correction data stored in the memory, the drive signal of the vibration feeder is corrected so that the set value set by the setting unit is proportional to the amplitude of the vibration feeder.

  As described above, according to the present invention, even if the set value of the vibration amplitude of the vibration feeder by the setting unit and the amplitude of the vibration of the actual vibration feeder are not proportional due to a mechanical element or the like, the set value and Since the drive signal of the vibration feeder is corrected so that the vibration amplitude of the actual vibration feeder is proportional, the set value does not match the actual vibration amplitude without providing a sensor for detecting the vibration feeder amplitude. Even though the set value is slightly changed, it is possible to prevent the vibration amplitude of the actual vibration feeder from changing greatly.

FIG. 1 is a schematic diagram showing a schematic configuration of a combination weigher according to an embodiment of the present invention. FIG. 2 is a perspective view of the linear feeder of FIG. FIG. 3 is a diagram showing the relationship between amplitude intensity and amplitude.

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

  FIG. 1 is a schematic diagram showing a schematic configuration of a combination weigher according to an embodiment of the present invention. The combination weigher of this embodiment is provided with a dispersion feeder 30 as a vibration feeder that disperses the objects to be weighed 2 supplied from the supply device 1 radially by vibration at the center of the upper portion of the apparatus. Includes a conical top cone 3 and a vibration device 4 that vibrates the top cone 3.

  The dispersion feeder 30 conveys an object to be weighed as a transported article supplied from the supply device 1 to the central portion of the top cone 3 in the direction of the peripheral portion by vibrating the top cone. Around the top cone 3, linear feeders 31 are radially provided as a plurality of vibration feeders for conveying the objects 2 to be weighed sent from the top cone 3 to the plurality of supply hoppers 5. Each rectilinear feeder 31 includes a trough 6 as a plurality of article loading portions and a plurality of vibration devices 7 that vibrate the trough 6.

  A plurality of supply hoppers 5 and weighing hoppers 8 are respectively provided on the peripheral edge of the trough 6 and arranged in a circumferential shape. The supply hopper 5 and the weighing hopper 8 are respectively provided with discharge gates 5a and 8a that can be opened and closed at their lower portions.

  The supply hopper 5 receives the object to be weighed 2 sent from the trough 6, and when the weighing hopper 8 arranged below it becomes empty, the discharge gate 5 a is opened and the object to be weighed 2 is put into the weighing hopper 8.

  Each weighing hopper 8 is provided with a weight sensor 9 such as a load cell for measuring the weight of the object 2 in the weighing hopper 8. The measurement value by each weight sensor 9 is output to the drive control part 10 provided with CPU and a memory | storage part.

  The drive control unit 10 performs a combination calculation, selects a combination of the weighing hoppers 8 from which the objects to be weighed 2 are to be discharged from the plurality of weighing hoppers 8, and receives a discharge request signal from the packaging machine 13. The discharge gate 8a of the weighing hopper 8 corresponding to the combination is opened to discharge the object 2 to the collecting chute 11, and further to the receiving port 14 of the packaging machine 13 through the lower collecting funnel 12. .

  Above the top cone 3 is provided a level detector 15 that detects the amount of the object 2 to be measured, for example, an optical sensor. The level detector 15 detects the layer thickness of the measurement object 2 on the top cone 3, and the detection output is given to the drive control unit 10. In the drive control unit 10, based on the layer thickness of the weighing object 2 on the top cone 3 detected by the level detector 15, the supply device 1 keeps the weighing object 2 on the top cone 3 at a constant amount. To control.

  The operation setting display unit 16 is configured using, for example, a touch panel and the like, and is a setting unit for operating the combination weigher and setting operation parameters thereof, and a display unit for displaying an operation speed, a combination measurement value, and the like on the screen. It has the function of.

  FIG. 2 is a perspective view of the rectilinear feeder 31 of FIG.

  The rectilinear feeder 31 includes a trough 6 that is an article loading unit and a vibration device 7 that vibrates the trough 6. The object to be weighed 2 is supplied to the base end part (rear part) of the trough 6, and the object to be weighed 2 is conveyed forward by vibrating the trough 6, and is discharged from the front end part of the trough 6.

  In the vibration device 7, a movable plate 24 is attached to a fixed frame 21 so as to be swingable via elastic members 22 and 23 made of, for example, carbon leaf springs. The elastic members 22 and 23 are attached between the fixed frame 21 and the movable plate 24 so that the upper end side thereof is inclined rearward.

  An adsorbed member (armature) 26 is fixed to the fixed frame 21 such that the electromagnet 25 has a predetermined angle with respect to the horizontal plane, and the movable plate 24 faces the electromagnet 25 with a predetermined interval. It is attached. The fixed frame 21 is attached to the base of the combination weigher via a vibration-proof spring 27.

  An attachment portion 28 is fixed to the upper surface of the movable plate 24 of the vibration device 7, and the trough 6 is detachably attached to the attachment portion 28 by an attachment fitting 29 provided on the lower surface thereof.

  In the linear feeder 31, when a voltage is applied to the electromagnet 25, the electromagnet 25 attracts the attracted member 26 fixed to the movable plate 24. At this time, the movable plate 24 moves to the electromagnet 25 side, that is, rearward and obliquely downward, as the elastic members 22 and 23 connecting the movable plate 24 and the fixed frame 21 are elastically deformed. Next, when the application of voltage to the electromagnet 25 is stopped, the attractive force generated in the electromagnet 25 is released, and the movable plate 24 moves obliquely upward in the forward direction by the elastic repulsive force of the elastic members 22 and 23. Since the trough 6 moves together with the movable plate 24, the trough 6 vibrates by repeating the above operation, and the object 2 to be weighed on the trough 6 is conveyed forward.

  Thus, in order to vibrate the rectilinear feeder 31, the drive voltage pulse is repeatedly applied to the electromagnet 25 in this embodiment.

  The conveyance amount of the object 2 to be measured by the linear feeder 31 is controlled by the drive time of the vibration device 7 that vibrates the trough 6 and the vibration amplitude of the trough 6. The vibration amplitude of the trough 6 depends on the pulse width of the drive voltage pulse. Be controlled.

  In a combination weigher having a plurality of linear feeders 31, the operation setting display unit 16 is operated to set operation parameters of the linear feeder 31. As the operating parameters, the driving time of the vibration device 7 is set in units of ms (milliseconds), and the vibration amplitude is set in 100 steps from “0” to “99” as the amplitude intensity. The amplitude intensity “0” corresponds to a stop in which the vibration amplitude is “0”, that is, the linear feeder 31 is not vibrated.

  This amplitude intensity is usually a numerical value corresponding to an electric signal given to the electromagnet 25 of each vibration device 7. When the vibration amplitude is controlled by the pulse width of the drive voltage pulse as in the present embodiment, the maximum pulse width is equally divided into 99 to correspond to 99 levels of amplitude intensity from “1” to “99”.

 As described above, although the set amplitude intensity and the pulse width of the drive voltage pulse are proportional, the actual vibration amplitude of the trough 6 is not proportional to the set amplitude intensity due to a mechanical element such as a leaf spring. Therefore, the set vibration intensity and the actual vibration amplitude of the trough 6 may not match.

  Therefore, in this embodiment, as shown in FIG. 1, the drive control unit 10 includes a drive pulse correction unit 32 that corrects the drive pulse based on the amplitude intensity set from the operation setting display 16. The drive pulse correction unit 32 corrects the drive pulse as described later based on the set amplitude intensity, and controls the drive of each linear feeder 31 with the corrected drive pulse. This correction is performed individually for each linear feeder 31.

  Hereinafter, correction by the drive pulse correction unit 32 will be described.

  First, in order to grasp the amount to be corrected, the actual vibration amplitude of the trough 6 in the state before correction is set to a plurality of points in the amplitude intensity of 100 steps from 0 to 99, for example, amplitude intensity 10, 20, 30. , 40, 50, 60, 70, 80, 90, 99, respectively, are measured using a measuring instrument such as a laser displacement meter. Table 1 shows the measured amplitudes (mm) at 10 points. Note that the number of measurement points is not limited to 10 and may be less than 10 or may exceed 10, and the measurement points may not be equally spaced.

  Table 1 shows the ten-point amplitude intensity set, the measured amplitude of the trough 6 actually measured at each amplitude intensity, and the ideal amplitude of the trough 6 proportional to the set amplitude intensity.

  The ideal amplitude is proportional to the set amplitude intensity, and when the maximum amplitude intensity 99 is set, the amplitude of the trough 6 is defined to be the maximum amplitude predetermined for each model. The maximum amplitude of the trough 6 when the maximum amplitude intensity 99 is set has already been adjusted to be that amplitude. In the combination weigher of this embodiment, the maximum amplitude of the trough 6 is 2.0 (mm). It is.

  Therefore, the ideal amplitude is proportional to the set amplitude intensity, and is defined so that the amplitude of the trough 6 becomes the maximum amplitude 2.0 when the maximum amplitude intensity 99 is set.

  Further, with respect to a plurality of linear feeders 31 of the combination weigher 1, measurement is performed when there are a plurality of linear feeders 31 whose trough measurement amplitude when the maximum amplitude intensity 99 is set is smaller than the maximum amplitude 2.0. The proportional relationship of the ideal amplitude is corrected so that it becomes the minimum amplitude among the small amplitudes.

  FIG. 3 shows the measured amplitude and the ideal amplitude in Table 1 with the amplitude (mm) on the vertical axis and the amplitude intensity on the horizontal axis. In FIG. 3, the broken line is the measured amplitude, and the solid line is the ideal amplitude. The ideal amplitude is obtained by dividing the maximum amplitude 2.0 into 99 equal parts as described above and corresponding to the amplitude intensities 1 to 99.

  In FIG. 3, the measured amplitude of the actual trough 6 indicated by a broken line is set to the set amplitude intensity with respect to the ideal amplitude indicated by the solid line that passes through the origin and has the maximum amplitude intensity of 99 at the maximum amplitude intensity of 99. The amplitude intensity that is set does not match the actual measured amplitude of the trough 6. In this example, the measured amplitude is only coincident at the two points of the origin and the vicinity of the amplitude intensity 32 with respect to the solid-line ideal amplitude indicating the proportional relationship.

  Therefore, in this embodiment, as in the ideal amplitude indicated by the solid line, the actual vibration amplitude of the trough 6 is corrected as follows so as to be proportional to the set amplitude intensity as much as possible.

First, for each measurement interval between the measurement points 10 points to calculate the coefficient K _n indicating the rate of change of the measured amplitude to the width of the amplitude intensity in accordance with the following equation.

K _n = (measurement amplitude _{n + 1} −measurement amplitude _n ) / (amplitude intensity width of each measurement section)
...... (1)
Table 2 shows the coefficient K _n for each measurement interval is calculated based on the formula (1).

In Expression (1), n corresponds to each of the first to tenth measurement intervals between the measurement points. For example, K ₁ is a coefficient in the first measurement interval of the amplitude intensity 0 to 9. , K ₂ is a coefficient in the second measurement interval of the amplitude intensity 10 to 19, K ₃ is a coefficient in the third measurement interval of amplitude intensity 20-29, and so on to, K ₁₀ is the amplitude intensity 90 The coefficients in the tenth measurement interval of ˜99 are shown.

(Measurement amplitude _{n + 1} −Measurement amplitude _n ) indicates the amplitude change width in each measurement interval. For example, in the first measurement interval of amplitude intensities 0 to 9, the second measurement interval is the second measurement interval. A value obtained by subtracting the measured amplitude 0.0 (see Table 1) of the amplitude intensity 0, which is the first value of the first measurement section, from the measured amplitude 0.0 (see Table 1) of the amplitude intensity 10 which is the first value of the measurement section. It becomes. Further, in the second measurement interval of the amplitude intensity 10 to 19, the measurement amplitude of 0.1 (see Table 1), which is the first value of the third measurement interval which is the next measurement interval, is 0.1 to 2 (see Table 1). This is a value obtained by subtracting 0.0 (see Table 1), which is the measurement amplitude of the amplitude intensity 10, which is the first value of the measurement interval. Further, in the third measurement section of the amplitude intensity 20 to 29, the measurement amplitude of 0.4 (see Table 1), which is the first value of the fourth measurement section, which is the next measurement section, is the third measurement section from the third measurement section. This is a value obtained by subtracting 0.1 (see Table 1), which is the measurement amplitude of the amplitude intensity 20, which is the first value of the measurement interval. Hereinafter, it is similarly calculated.

  (Amplitude intensity width of each measurement interval) is, for example, 9 (= 9-0) in the first measurement interval of amplitude intensities 0 to 9, and 9 (in the second measurement interval of amplitude intensities 10 to 19). = 19-10), and in the third measurement section with amplitude intensities 20 to 29, 9 (= 29-20), and similarly, all are "9".

Thus, for each measurement period, the coefficient K _n indicating the rate of change of the measured amplitude to the amplitude intensity, is calculated as shown in Table 2.

Next, using the coefficient K _n, so that the ideal amplitude is obtained, the amplitude intensity of the measuring points is corrected to amplitude intensity after correction by the following equation (2).

Amplitude intensity after correction
= (Ideal amplitude-Start amplitude of measurement section to which ideal amplitude belongs) / K _n + Start strength of measurement section to which ideal amplitude belongs (2)
This equation (2) is an equation for calculating the amplitude intensity for making the measurement amplitude at each measurement point the ideal amplitude.

  Table 3 shows the value of each term in Equation (2) and the calculated amplitude intensity after correction of each measurement point.

For example, when the amplitude intensity is 10, the ideal amplitude is 0.2 (mm) as shown in Table 1. Then, the measurement interval where the measurement amplitude is actually 0.2 is the third measurement interval of the amplitude intensity 20 to 29, as can be seen from Table 1 or FIG. As shown, the measured amplitude is 0.1 when the amplitude intensity is 20. Further, as shown in Table 2, the coefficient K ₃ in the third measurement section is K ₃ = 0.033. The amplitude intensity at the beginning of the third measurement period is 20. Therefore, the corrected amplitude intensity of the amplitude intensity 10 is
Intensity after correction = (Ideal amplitude-Start amplitude of measurement section to which ideal amplitude belongs) / _Kn + Start intensity of measurement section to which ideal amplitude belongs
= (0.2-0.1) /0.033+20
= 23.03
And rounds to the nearest 23.

Further, for example, at the amplitude intensity 20, as shown in Table 1, the ideal amplitude is 0.4 (mm). The measurement interval where the measurement amplitude is actually 0.4 is the fourth measurement interval of amplitude intensities 30 to 39, as can be seen from Table 1 or FIG. As shown, the measured amplitude is 0.4 when the amplitude intensity is 30. The coefficient K ₄ in the fourth measurement section is K ₄ = 0.089 as shown in Table 2. The amplitude intensity at the beginning of the fourth measurement period is 30. Therefore, the corrected amplitude intensity of the amplitude intensity 20 is
Intensity after correction = (Ideal amplitude-Start amplitude of measurement section to which ideal amplitude belongs) / _Kn + Start intensity of measurement section to which ideal amplitude belongs
= (0.4-0.4) /0.089+30
= 30
It becomes.

Further, for example, at the amplitude intensity 30, the ideal amplitude is 0.6 (mm) as shown in Table 1. The measurement interval where the measurement amplitude is actually 0.6 is the fourth measurement interval of amplitude intensities 30 to 39, as can be seen from Table 1 or FIG. As shown, the measured amplitude is 0.4 when the amplitude intensity is 30. The coefficient K ₄ in the fourth measurement section is K ₄ = 0.089 as shown in Table 2. The amplitude intensity at the beginning of the fourth measurement section is 30. Therefore, the corrected amplitude intensity of the amplitude intensity 30 is
Intensity after correction = (Ideal amplitude-Start amplitude of measurement section to which ideal amplitude belongs) / _Kn + Start intensity of measurement section to which ideal amplitude belongs
= (0.6-0.4) /0.089+30
= 32.25
And rounded off to the nearest 32.

  Similarly, as shown in Table 3, the corrected amplitude intensity is calculated for each amplitude intensity at 10 measurement points.

  In this embodiment, using the amplitude intensity after correction, the pulse width of the drive voltage pulse per intensity 1 of the amplitude intensity before correction is corrected by the following equation. This correction is performed for each measurement section using the corrected amplitude intensity at each measurement point.

Pulse width per intensity 1 after correction = (Amplitude intensity _{n + 1} after correction−Amplitude intensity _n after correction) × Pulse width per intensity 1 before correction / Amplitude intensity range (3)
Here, the pulse width per intensity 1 before correction is, for example, 61.25 (μs).

  Table 4 below shows the pulse width of the drive voltage pulse per intensity 1 after correction in each measurement interval calculated by the above equation (3) and the cumulative value of the pulse width for each measurement interval.

In the above equation (3), for example, in the first measurement interval of amplitude intensity 0 to 9, the corrected amplitude intensity _{n + 1} is the second measurement interval of amplitude intensity 10 to 19, which is the next measurement interval. The amplitude amplitude _n after correction is 23 (refer to Table 3), and the corrected amplitude intensity _n is 0 (refer to Table 3) corresponding to the amplitude amplitude 0 at the beginning of the first measurement interval. The range of the amplitude intensity is 10 from 0 to 9. Therefore, the pulse width per intensity 1 after correction of the first measurement interval is
The pulse width per intensity after correction = (23-0) × 61.25 / 10 = 140.88 (μs).

Further, for example, in the second measurement interval of the amplitude intensity 10 to 19, the corrected amplitude intensity _{n + 1} is the first amplitude intensity 20 of the third measurement interval of the amplitude intensity 20 to 29 that is the next measurement interval. 30 (see Table 3), and the corrected amplitude intensity _n becomes 23 (see Table 3) corresponding to the first amplitude intensity 10 of the second measurement interval. The range of the amplitude intensity is 10 from 0 to 9. Therefore, the pulse width per intensity after correction of the second measurement interval is
Pulse width per intensity after correction = (30-23) × 61.25 / 10 = 42.88 (μs).

  In the same manner, the pulse width of the driving voltage pulse per intensity after correction in each measurement section is calculated.

  Table 4 shows the cumulative value of each measurement interval of the pulse width per intensity 1 after correction. For example, the cumulative value per intensity 10 in the first measurement interval of intensity 0 to 9 is 140.88 × 10 = 1408.8 (μs), and the accumulated value of the second measurement interval of intensity 10 to 19 Is 1408.8 + 42.88 × 10 = 1837.6 (μs) using the cumulative value of the first measurement interval, and similarly, the cumulative value of the pulse width per intensity is calculated for each measurement interval. .

  Further, when the pulse width other than the accumulated value, for example, the intensity 15, is 1408.8 + 42.88 × 6 = 1666.08 (μs) using the accumulated value 1408.8 of the first measurement section having the intensity 0 to 9. .

  Thus, based on the corrected pulse width value per intensity in Table 4, the corrected pulse width for 100-level amplitude intensity from 0 to 99 is calculated, and the drive pulse voltage of the calculated pulse width is calculated. Is applied, the vibration amplitude becomes proportional to the amplitude intensity as in the ideal amplitude shown in FIG.

  The relationship between the amplitude intensity when corrected as described above and the actually measured measurement amplitude is indicated by a one-dot chain line in FIG. In almost all amplitude intensity setting ranges, it matches the ideal amplitude indicated by the solid line, and is slightly larger than the ideal amplitude in the range of amplitude intensities of 40 to 80. This is considered to be caused by an amplitude measurement error or the like.

  The range of the amplitude intensity that deviates from this ideal amplitude is about 40% of the entire set range of 0 to 99, and the most deviated from the ideal amplitude in this range is the amplitude of about 1 near the amplitude intensity 55. .4, and the ratio of the maximum deviation amount to the ideal amplitude of about 1.2 is about 16.7 [= (1.4−1.2) /1.2} × 100]%.

  Thus, the corrected measured amplitude indicated by the alternate long and short dash line agrees with the ideal amplitude in most of the amplitude intensity setting ranges, that is, in the range of about 60% of the entire setting range, and is indicated by the broken lines. It can be seen that there is a significant improvement over the previous measurement amplitude.

  In this embodiment, the corrected measurement amplitude continuously matches the solid line ideal amplitude indicating the proportional relationship. However, in the present invention, the measurement amplitude may not always match. For example, the solid line ideal amplitude is set so that the measured amplitude after correction is smaller than the ideal amplitude in a certain amplitude intensity range, larger than the ideal amplitude in the next amplitude intensity range, and further smaller in the next amplitude intensity range. A plurality of points, at least 3 points or more, preferably 4 points or more may be crossed (matched) so as to be sandwiched.

  Further, in this embodiment, the ratio of the maximum deviation amount in the portion that does not match the ideal amplitude of the solid line is about 16.7% as described above, but in the present invention, the ratio of this maximum deviation amount. Is within 40%, preferably within 30%, more preferably within 20%, and even more preferably within 10%.

  Since the maximum deviation amount can be suppressed as compared with the conventional example in this way, the range of the amplitude intensity that matches the ideal amplitude does not necessarily have to be about 60% as described above. It may be 20% or more, preferably 30% or more, more preferably 40% or more, and still more preferably 50% or more. Further, the coincident range may be continuous or divided into a plurality of ranges, and when divided, the sum is the above-mentioned ratio with respect to the entire set range. I just need it.

  The accuracy of correction such as the ratio of the maximum deviation amount and the ratio of the range that matches the ideal amplitude can be selected by selecting the number of measurement points.

  The combination weigher includes a plurality of rectilinear feeders 31. For each rectilinear feeder 31, for example, as described above, the amplitude of the rectilinear feeder 31 is actually measured at 10 measurement points, and the measurement section is measured as described above. The pulse width after correction is calculated every time, a table of correction data corresponding to Table 4 is created, and stored in the memory of the drive pulse correction unit 32 of the drive control unit 10.

  The above is performed on the manufacturer side of the combination weigher, and the user operates the operation setting display unit 16 to set the amplitude intensity in 100 steps from 0 to 99 as in the conventional case. In accordance with the setting of the amplitude intensity, based on the correction data table as shown in Table 4 above, the drive control unit 10 sends the drive voltage pulse to the linear feeder with the corrected pulse width corresponding to the set amplitude intensity. 31 is applied.

  Thereby, the amplitude of the trough 6 of the linear feeder 31 becomes proportional to the set amplitude intensity as compared with the conventional example. Therefore, even if the set amplitude intensity and the actual vibration amplitude are not proportional to each other as in the measurement amplitude indicated by the broken line in FIG. 3 due to the mechanical elements such as the elastic members 22 and 23, this is corrected. Thus, it can be brought close to the ideal amplitude of FIG. Accordingly, the amplitude of the trough 6 of the linear feeder 31 does not change steeply due to a slight change in the amplitude intensity setting, and the adjustment of the transport amount of the object to be measured is facilitated. In addition, there is no need to provide a sensor for detecting the amplitude of the trough 6 as in the above-mentioned Patent Document 1.

  Further, as described above, the ideal amplitude indicated by the solid line in FIG. 3 is adjusted so that the maximum amplitude when the maximum amplitude intensity 99 is set becomes a value determined in advance for each model. . For example, in the above-described embodiment, the maximum amplitude is 2.0 (mm), and when the maximum amplitude before adjustment exceeds 2.0, the elastic members 22 and 23 are replaced. The maximum amplitude is adjusted to 2.0, but this adjustment is troublesome.

  According to this embodiment, when the maximum amplitude before the adjustment exceeds 2.0, the ideal amplitude is set so that the amplitude intensity at which the amplitude becomes 2.0 becomes the maximum amplitude intensity 99. The above proportional relationship may be corrected and corrected so that the corrected proportional relationship is obtained, and the above-described operation for adjusting the maximum amplitude is unnecessary or simplified.

(Other embodiments)
(1) In the above-described embodiment, the driving magnet is driven by applying a driving voltage pulse to the electromagnet of the vibration feeder. However, as another embodiment of the present invention, the AC voltage from the commercial AC power source is controlled to start the SSR. You may apply to an electromagnet through switching elements, such as. In this case, the firing angle of the switching element is controlled, the trough is vibrated by the attractive force of the electromagnet during conduction and the repulsive force due to the spring action of the elastic members 22 and 23, and the object to be weighed is conveyed.

  In this case, the vibration amplitude of the trough is controlled by the conduction time corresponding to the firing angle of the switching element. For the vibration amplitude of the trough, the amplitude intensity is set in 100 stages from “0” to “99”, for example, as in the above embodiment, and the amplitude intensity “0” corresponds to the vibration amplitude “0”.

  When controlling the firing angle of the switching element by controlling the firing angle of the switching element, as in the above embodiment, for example, the actual vibration amplitude before correction at 10 points is measured, and as described above. Then, the corrected amplitude intensity is calculated by equation (2).

  Then, instead of the pulse width per amplitude intensity 1, the half cycle conduction time per amplitude intensity 1 is calculated by the following equation.

Half-cycle conduction time per corrected intensity 1 = (Amplitude intensity _{n + 1} after correction−Amplitude intensity _n after correction) × Conduction time / half-cycle conduction time per intensity 1 before correction …… ( 4)
Here, the conduction time of a half cycle per intensity 1 before correction is a drive power supply cycle / 2/99. For example, when the drive power supply frequency is 50 Hz, it is 20 ms / 2/99.

  Thereafter, in the same manner as in the above-described embodiment, instead of the pulse width per intensity 1, the half-cycle conduction time per intensity 1 after correction is calculated according to Equation (4), and the correction data similar to Table 4 above is calculated. A table may be created, and the firing angle of the switching element may be controlled based on the correction data table.

  (2) According to the present invention, since the set amplitude intensity and the amplitude intensity of the vibration feeder are corrected so as to be proportional, the conveyance amount of the object to be weighed by the vibration feeder set with the same amplitude intensity is: It will be almost the same. Therefore, as another embodiment of the present invention, a comparison is made between each conveyance amount by a plurality of linear feeders of a combination weigher, and a linear feeder that has a different conveyance amount compared to other linear feeders is a linear feeder that needs to be inspected. For example, it is preferable that the operation setting display unit 16 is notified by display.

  Since the transport amount of the object to be weighed by each linear feeder is obtained as a measured value by the weight sensor, for example, an average value of each transport amount of a plurality of linear feeders having the same amplitude intensity is calculated, and this average value is calculated. May be calculated, and when the deviation exceeds a predetermined threshold, the linear feeder may be notified.

  Such a linear feeder with a large deviation cannot correctly transport the object to be weighed due to poor adjustment, secular change, wear, etc., and appropriate measures such as inspection adjustment and replacement can be taken based on the notification. it can.

  (3) In the above-described embodiment, the pulse width and conduction time per intensity are corrected. However, as another embodiment of the present invention, the pulse width and conduction time are not corrected and are kept as before. Control may be performed in the same manner as in the past according to the strength of the.

  That is, as shown in Table 3 above, for example, when the amplitude intensity 10 is set, the vibration feeder is vibrated assuming that the corrected amplitude intensity 23 is set, and when the amplitude intensity 20 is set, Similarly, if the corrected amplitude intensity 30 is set, the vibration feeder is vibrated. Similarly, when the amplitude intensity at each measurement point is set, the corrected amplitude intensity is set and the vibration feeder is vibrated. Good.

  In addition, the corrected amplitude intensity between the measurement points is determined by a proportional relationship, and the corrected amplitude intensity after the decimal point may be rounded off. For example, when an amplitude strength between 0 and 10 amplitude amplitude, for example, amplitude strength 5 is set, the vibration feeder is driven assuming that corrected amplitude strength 5 × 23/10 = 11.5≈12 is set. That's fine. Further, for example, when an amplitude intensity between 10 and 20 is set, for example, an amplitude intensity 15, the corrected intensity 23 of the amplitude intensity 10 is added, and the corrected amplitude intensity 23 + 5 × (30−23) ) /10=26.5≈27 is set, the vibration feeder may be driven. Further, for example, when an amplitude strength between the amplitude strengths 70 to 80, for example, the amplitude strength 75 is set, the corrected strength 45 of the amplitude strength 70 is added, and the corrected amplitude strength 45 + 5 × (50−45). ) /10=47.5≈48 is set, and the vibration feeder may be driven.

  In this way, it is not necessary to correct the pulse width and conduction time per intensity, and only the amplitude intensity is corrected and the corrected amplitude intensity is set.

  (4) In the above-described embodiment, the present invention is applied to the linear feeder. However, the present invention is not limited to the linear feeder, and can be similarly applied to other vibration transfer apparatuses such as a distributed feeder.

DESCRIPTION OF SYMBOLS 1 Supply apparatus 2 To-be-measured object 3 Top cone 4 Vibrating apparatus 5 Supply hopper 6 Trough 7 Vibrating apparatus 8 Weighing hopper 9 Weight sensor 10 Drive control part 13 Packaging machine 16 Operation setting display part 21 Fixed frame 22, 23 Elastic member 24 Movable plate 25 Electromagnet 26 Adsorbed member (armature)
27 Anti-vibration spring 30 Dispersion feeder (vibration feeder)
31 Straight feeder (vibration feeder)

Claims (6)

A vibration feeder that vibrates an article loading section on which an article is loaded and conveys the article, a setting section that sets an amplitude of vibration of the vibration feeder, and controls the driving of the vibration feeder according to a setting value of the setting section A drive control unit,
The drive control unit includes a memory in which correction data is stored, and based on the correction data, the vibration feeder is configured such that a setting value set by the setting unit is proportional to the amplitude of the vibration feeder. To correct the driving signal of
The correction data is data based on a plurality of setting values set by the setting unit and a plurality of measurement amplitudes of the vibration feeder measured corresponding to the setting values.
A vibration conveying apparatus characterized by that. The drive signal is a drive voltage pulse for the vibration feeder, and the drive control unit corrects a pulse width of the drive voltage pulse;
The vibration conveyance apparatus according to claim 1. The drive signal is an alternating voltage supplied to the vibration feeder via a switching element, and the drive control unit corrects an ignition angle of the switching element;
The vibration conveyance apparatus according to claim 1. The drive control unit corrects the setting value set by the setting unit so as to be proportional to the amplitude of the vibration feeder, and corrects the driving signal according to the corrected setting value.
The vibration conveyance apparatus according to any one of claims 1 to 3. A dispersion feeder that disperses the objects to be weighed supplied from the supply device to the surroundings, a plurality of linear feeders that are respectively arranged around the dispersing feeders and respectively convey the objects to be weighed dispersed by the dispersing feeders, A plurality of supply units arranged corresponding to the linear feeders, holding the objects to be weighed out from the linear feeders, and supplying the held objects to be measured downward, and arranged corresponding to the respective supply units. A plurality of weighing units that hold the objects to be weighed supplied from each supply unit and weigh the weight of the held objects to be weighed, and combinations based on the measured values of the objects to be weighed by the weighing units. A combination weigher comprising a control unit for performing calculations,
At least one of the dispersion feeder and the rectilinear feeder is configured by the vibration conveyance device according to any one of claims 1 to 4.
A combination weigher characterized by that. A vibration feeder that vibrates an article loading section on which an article is loaded and conveys the article, a setting section that sets an amplitude of vibration of the vibration feeder, and controls the driving of the vibration feeder according to a setting value of the setting section A drive method for a vibration conveying device comprising a drive control unit,
Each setting value is set by the setting unit, and each amplitude of vibration of the vibration feeder corresponding to each setting value is measured,
Based on each of the plurality of setting values and each amplitude of vibration of the vibration feeder measured corresponding to each setting value, the setting value set by the setting unit and the amplitude of the vibration feeder are Find correction data to correct proportionally,
The obtained correction data is stored in the memory of the drive control unit,
Based on the correction data stored in the memory, the drive signal of the vibration feeder is corrected so that the setting value set by the setting unit is proportional to the amplitude of the vibration feeder.
A driving method of the vibration conveying apparatus.

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