JP5844090B2 - Vibration conveying apparatus and combination weigher using the same - Google Patents

Description

  The present invention relates to a vibration conveying apparatus that conveys an article using vibrations generated by a magnetic coil attraction force and a spring restoring force, and a combination weigher using the vibration conveying device.

  Generally, a combination weigher is an article to be weighed, which is provided with a conical dispersion feeder and a plurality of rectilinear feeders provided radially around the dispersion feeder, and is supplied from the dispersion feeder by the rectilinear feeder. A certain object to be weighed is supplied to the lower supply hopper, and further supplied from the supply hopper to the measurement hopper. The rectilinear feeder is configured by a vibration conveyance device, and conveys an object to be weighed by vibrating a trough on which the object to be weighed is loaded (for example, see Patent Document 1).

  In such a combination weigher, an object to be weighed is supplied to a supply hopper by a linear feeder, is further supplied to a weighing hopper, is weighed, and a combination operation is performed based on the measured value, thereby combining weights obtained by combining the measured values. Selects the combination of weighing hoppers that matches or is closest to the target combination weight, and discharges the object to be weighed from the selected weighing hopper. The discharged objects to be weighed are put into, for example, a packaging machine via an assembly chute and packaged.

  In the combination weigher described above, the conveyance amount of the object to be weighed conveyed to the supply hopper is controlled by controlling the vibration amplitude and vibration time of the linear feeder.

  FIG. 7 is a circuit configuration diagram of a conventional example of a vibration device for vibrating a trough of a linear feeder.

Vibration device for vibrating the trough linear feeder has a power supply device 1, a magnet coil driving unit 2 _1. To the power supply device 1, a magnet coil driving unit 2 ₁ is connected in driving power supply line 3 and the common power supply line 5. The power supply device 1 includes a voltage control unit 1 b and outputs a magnet coil drive voltage from the voltage control unit 1 b to the drive power supply line 3.

Magnet coil driving unit 2 _1, between the drive power supply line 3 and the common power supply line 5, the first switching element SW1, the magnet coil L1, a drive voltage path formed by connecting the second switching element SW2 in series, the Two diodes D2, a magnet coil L1, and a back electromotive force path formed by connecting the first diode D1 in series.

In operation, and it outputs a constant magnitude of the drive voltage to the magnet coil driving unit 2 ₁ from the voltage control unit 1b of the power supply 1 through the driving power supply line 3. In the magnet coil driving unit 2 _1, both switching elements SW1, SW2 simultaneously turned on to form a drive voltage path P3, the driving voltage input from the driving power supply line 3 is applied to the magnet coil L1. Thereby, the to-be-vibrated body to which the trough is attached is attracted to the magnet coil L1.

  Next, in order to cancel the attraction of the vibrating body to the magnet coil L1 and return it with a spring, both the switching elements SW1 and SW2 are simultaneously turned off to cut off the application of the drive voltage to the magnet coil L1. Thereby, the to-be-vibrated body returns with the restoring force of the spring. In this case, if the drive voltage is constant, the vibration of the vibrating body is also constant.

  In this way, the object to be vibrated vibrates due to the attraction of the magnetic force of the magnet coil L1 and the return by the restoring force of the spring, and this vibration is transmitted to the trough of the linear feeder to convey the object to be weighed.

  In this vibration device, when the drive voltage falls to cancel the attraction of the vibrating body to the magnet coil L1, a counter electromotive force is generated in the magnet coil L1. The voltage was returned from the electromotive force path P4 to the voltage control unit 1b of the power supply device 1 via the drive power supply line 3.

JP 2006-201099 A

In the combination weigher, since it is necessary to vibrate a plurality of linear feeders, each of the plurality of magnet coil driving units 2 ₁ , 2 ₂ ... 2n is supplied with power via a drive power line 3 as shown in FIG. A common connection is made to the device 1. Therefore, the back electromotive force generated in each magnet coil L1 of each of the magnet coil driving units 2 ₁ , 2 ₂ ... 2n is commonly applied to the drive power supply line 3.

Since each linear feeder is driven individually, the on / off timings of the switching elements SW1, SW2 of the respective magnet coil driving units 2 ₁ , 2 ₂ ... 2n do not coincide with _each other. counter electromotive force V1 generated in the magnet coil L1 is applied to the driving voltage of the other magnet coil driving unit 2 ₂ ... 2n magnets coil L1, the driving voltage of the other magnet coil driving unit 2 ₂ ... 2n is changed End up. For this reason, there is a problem that the vibration amplitude of the vibrating body that vibrates with the magnetic force of the magnet coil L1 becomes unstable, which affects the transport amount of the object to be weighed in the linear feeder.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a vibration transfer device that can transfer an article by stable vibration without being affected by back electromotive force, and a combination weigher using the vibration transfer device. Yes.

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

(1) The vibration transfer device of the present invention includes a power supply device and a plurality of magnet coil drive units each including a magnet coil therein, and the power supply device applies a drive voltage to one end side of the magnet coil. And a power regeneration unit that regenerates a counter electromotive force generated on the other end side of the magnet coil when the application of the drive voltage is interrupted, and the plurality of magnet coil drive units said one end of the magnet coil, while having the configuration in which the driving voltage is applied via the same drive power supply line from the voltage controller in said power supply device, to said one end of each of the magnet coil with the interruption of application of the driving voltage, separate distribution is the back electromotive force generated in the other end of each of the magnet coil and the drive power supply line Characterized in that at a through counter electromotive force line were to be introduced into the power regeneration unit in the power supply device.

  According to the present invention, since the back electromotive force generated in the magnet coil is returned to the power supply device via the back electromotive force line which is a separate wiring from the drive power supply line, the back electromotive force generated in a certain magnet coil driving unit. Thus, the drive voltage in the other magnet coil drive unit is not affected, and the magnet coil can be driven with a constant drive voltage. This stabilizes the amplitude of vibration of the vibrating body that is attracted and vibrated by the magnet coil, thereby stabilizing the conveyance amount of the article.

(2) In a preferred embodiment of the vibration transfer device of the present invention, each of the magnet coil driving units is connected to the driving power line from the voltage control unit in the power supply device with a first switching element, the magnet coil, And a first path formed by connecting the second switching element in series in this order, and the one end side of the magnet coil via the drive power line by turning on and off the switching elements in the first path. application and its cut-off of the drive voltage are controlled for.

  According to this embodiment, the application of the drive voltage to the magnet coil and the cutoff thereof can be controlled by controlling on / off of the first and second switching elements.

(3) In another embodiment of the vibration transfer device of the present invention, each of the magnet coil driving units has a cathode of a first diode connected to the counter electromotive force line to the power regeneration unit in the power supply device , An anode of the first diode is connected to one end side of the magnet coil, and the other end side of the magnet coil is connected to a cathode of the second diode. The second path is connected to the magnet coil. when the counter electromotive force is generated in said that both diodes conducts, a path for introducing the counter-electromotive force which the generated, the power regeneration unit in the power supply through the back electromotive force line It comes to form.

  According to this embodiment, the counter electromotive force generated in the magnet coil can be introduced into the power supply device via the counter electromotive force line that is a wiring other than the drive power supply line.

  (4) The combination weigher of the present invention is a dispersion feeder that disperses the objects to be weighed in the peripheral direction, and a plurality of straight advancements that are radially provided around the dispersion feeder and respectively convey the objects to be weighed from the dispersion feeder. A feeder, a plurality of supply hoppers that are provided corresponding to each linear feeder, hold the objects to be weighed from the respective linear feeders, and discharge downward, and are provided corresponding to each supply hopper and each supply In the combination weigher comprising a plurality of weighing hoppers each holding the objects to be weighed supplied from the hopper and weighing the objects to be weighed, the vibration transfer device according to any one of (1) to (3) above Each of the plurality of linear feeders is driven by each magnet drive unit of the vibration transfer device.

  According to the combination weigher of the present invention, the counter electromotive force generated in the magnet coil of each linear feeder is returned to the power supply device via the counter electromotive force line different from the drive power supply line. The drive voltage in the magnet coil drive unit of another linear feeder is not affected by the counter electromotive force generated in the unit, and the magnet coil of the linear feeder can be driven with a constant drive voltage. As a result, the vibration amplitude of the vibrating body that is attracted and vibrated by the magnet coil is stabilized, that is, the vibration amplitude of the trough of the linear feeder is stabilized, and the conveyance amount of the object to be measured is stabilized.

  According to the present invention, since the counter electromotive force generated in the magnet coil is returned to the power supply device via the counter electromotive force line different from the drive power supply line, the counter electromotive force generated in a certain magnet coil driving unit The driving voltage in the magnet coil driving unit is not affected, and the magnet coil can be driven with a constant driving voltage. As a result, the amplitude of vibration of the vibrating body that is attracted and vibrated by the magnet coil is stabilized, and the conveyance amount of the article is stabilized.

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 diagram showing a configuration of the linear feeder of FIG. FIG. 3 is a circuit configuration diagram of a main part of the vibration transfer device of the linear feeder of FIG. FIG. 4 is a diagram showing the drive pulse and applied voltage of FIG. FIG. 5 is a diagram corresponding to FIG. 3 showing a state when a drive voltage is applied. FIG. 6 is a diagram corresponding to FIG. 3 showing a state when the back electromotive force is generated. FIG. 7 is a diagram showing a partial configuration of a conventional example. FIG. 8 is a diagram showing a configuration of a conventional example.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying 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 includes a conical top cone 12 that radially disperses the objects to be weighed 11 supplied from the supply device 10 by vibration and a vibration device 13 that vibrates the top cone 12 in the center of the upper portion of the device. A distributed feeder 14 is provided.

  The supply device 10 conveys the object to be measured 11 supplied from a belt conveyor (not shown) by vibration and supplies it to the central portion of the top cone 12. In the top cone 12, the object to be weighed 11 supplied from the supply device 10 to the central portion thereof is conveyed toward the peripheral portion by vibration. Around the top cone 12, a plurality of rectilinear feeders 16 serving as vibration conveying devices that convey the objects to be weighed 11 sent from the top cone 12 to the plurality of supply hoppers 15 are provided radially. Each linear feeder 16 includes a trough 17 on which the object to be weighed 11 is loaded and a vibration device 18 that vibrates the trough 17.

  A plurality of supply hoppers 15 and weighing hoppers 19 are respectively provided below the peripheral edge portion of the trough 17 and arranged circumferentially.

  Under the supply hopper 15 and the weighing hopper 19, a discharge gate 20 and a gate 21 that can be opened and closed are respectively provided.

  The supply hopper 15 receives the object to be weighed 11 transported by the trough 17, and when the weighing hopper 19 disposed below it is empty, the discharge gate 20 is opened and the object to be weighed 11 is put into the weighing hopper 19. . Each weighing hopper 19 is attached with a weight sensor 22 such as a load cell for measuring the weight of the object 11 in the weighing hopper 19, and a weight value obtained by each weight sensor 22 is output to the control device 23.

  A combination of the weighing hoppers 19 from which the objects to be weighed 11 are to be discharged is obtained from among the plurality of weighing hoppers 19 by a combination calculation by the control device 23, and if a discharge request signal is input from a packaging machine (not shown), the combination is applicable. The objects to be weighed 11 are discharged from the weighing hopper 19 to the collecting chute 24 and further discharged to the packaging machine (not shown) via the discharge chute 25 below.

  Above the top cone 12, for example, an ultrasonic level detector 26 for detecting the amount of the object 11 to be weighed is provided. The level detector 26 detects the layer thickness of the object to be weighed on the top cone 12, and provides the detection output to the control device 23. In the control device 23, the supply device 10 is controlled so as to keep the weighing object 11 on the top cone 12 at a constant amount based on the layer thickness of the weighing object 11 on the top cone 12 detected by the level detector 26. Control.

  The operation setting indicator 27 is configured using, for example, a touch panel, etc., and performs operation of the combination weigher and setting of operation parameters thereof, and displays an operation speed, a combination measurement value, and the like on the screen.

  The control device 23 performs operation control of the supply device 10 and overall operation of the combination weigher, and performs combination calculation. In the combination calculation, one combination of the weighing hoppers 19 in which the combined weight that is the sum of the measured values of the objects to be weighed 11 is within the allowable range with respect to the combination target weight is selected from the plurality of weighing hoppers 19. The object to be weighed 11 is discharged from the weighing hopper 19 and is put into the packaging machine through the collecting chute 24 and the discharge chute 25 as described above and packaged.

  FIG. 2 is a view showing the linear feeder 16 of FIG.

  The linear feeder 16 includes a trough 17 on which the object to be weighed 11 is loaded, and a vibration device 18 that conveys the object to be weighed 11 by vibrating the trough 17.

  The vibration device 18 includes a base 30 attached to a gantry 28 via a plurality of vibration-proof elastic bodies 29. The base 30 swings via elastic members 31a and 31b made of leaf springs. A vibration member 32 is attached as possible, and a movable iron core 34 is attached to the vibration member 32. An electromagnet 33 is attached to the base 30 so as to face the movable iron core 34 with a gap.

  By applying a voltage to the electromagnet 33 and releasing it, the diaphragm 32 is vibrated through the elastic members 31a and 31b, so that an object to be weighed placed on the trough 17 is brought into contact with the base end of the trough 17 (right side in FIG. 2). ) Side to the tip (left side of FIG. 2) side of the trough 17 as indicated by the arrow A and discharged from the tip.

FIG. 3 is a diagram showing a circuit configuration of the vibration transfer device of this embodiment. With reference to the figure, the vibration conveyance device of this embodiment includes a power supply device 1 and magnet coil driving units 2 ₁ , 2 ₂ ,..., 2n of a plurality of linearly moving feeders 16. The power supply device 1 supplies power to a plurality of rectilinear feeders 16, and each of the magnet coil driving units 2 ₁ , 2 ₂ ,..., 2n corresponds to the vibration device 18 of each rectilinear feeder 16.

Each of the magnet coil drive units 2 ₁ , 2 ₂ ,..., 2n is connected to the power supply device 1 through a drive power supply line 3, a counter electromotive force line 4 and a common power supply line 5.

The power supply device 1 includes a power regeneration unit 1a and a voltage control unit 1b as main components. The power regeneration unit 1a inputs a power supply voltage. A counter electromotive force line 4 is connected to the power regeneration unit 1a, and a counter electromotive force is input from the magnet coil driving units 2 ₁ , 2 ₂ ,..., 2n via the counter electromotive force line 4. The voltage control unit 1b is supplied with a voltage from the power regeneration unit 1a, and supplies a drive voltage to the magnet coil drive units 2 ₁ , 2 ₂ ,.

Magnet coil driving unit 2 _1, 2 _2, ..., 2n are all have the same configuration, will be described the configuration of the magnet coil driving unit 2 ₁ as a representative, the magnet coil driving unit 2 ₁ is made of, for example, FET First and second switching elements SW1 and SW2, a magnet coil L1 corresponding to the electromagnet 33 of FIG. 2 described above, and first and second diodes D1 and D2 are provided.

  The first switching element SW1, the magnet coil L1, and the second switching element SW2 are connected in series in this order between the drive power supply line 3 and the common power supply line 5, and a drive voltage path to the magnet coil L1 described later. Configure.

  The second diode D2, the magnet coil L1, and the first diode D1 are connected in series in this order between the common power supply line 5 and the counter electromotive force line 4, and the back electromotive force generated by the magnet coil L1 described later is generated. A counter electromotive force path to be introduced into the counter electromotive force line 4 is configured.

  The switching elements SW1 and SW2 are turned on and off in synchronization with the drive signal S1 shown in FIG. When the switching elements SW1 and SW2 are simultaneously turned on, the drive voltage V0 shown in FIG. 4B is applied to the magnet coil L1 in a pulse shape. When the switches SW1 and SW2 are turned off simultaneously, the drive voltage V0 of the magnet coil L1 is cut off and falls. When the drive voltage V0 falls, due to the nature of the magnet coil, a counter electromotive force V1 having a polarity opposite to that of the drive voltage V0 is generated in the magnet coil L1.

Next, the operation will be described with reference to FIGS. Since the magnet coil driving units 2 ₁ , 2 ₂ ,..., 2n have the same configuration, the operation of the magnet coil driving unit 2 will be mainly described.

As shown in FIG. 5, the magnet coil driving unit 2 _1, first the driving signal S1, the second switch SW1, SW2 are turned on, through the driving power supply line 3 from the power supply 1, first switching element SW1 → Magnet coil L1 → A drive voltage is applied to magnet coil L1 in a pulsed manner in drive voltage path P1 as the first path of second switching element SW2.

  As a result, the drive voltage V0 is applied to the magnet coil L1, a current flows in response to this application, a magnetic force is generated in the magnet coil L1, and the vibrating body is attracted.

  Next, as shown in FIG. 6, when the first and second switches SW1 and SW2 are turned off by the drive signal S1, the application of the drive voltage V0 is cut off and the drive voltage V0 falls. A back electromotive force V1 is generated at L1. When the counter electromotive force V1 is generated, the first and second diodes D1 and D2 are turned on. Therefore, a counter electromotive force path P2 is formed as the second path in the magnet coil driving unit 2, and the counter electromotive force V1 is formed. Is input from the back electromotive force path P2 to the power regeneration unit 1a of the power supply device 1 through the back electromotive force line 4. The back electromotive force V1 input to the power regeneration unit 1a is regenerated here. Although detailed description of this regeneration process is omitted, the back electromotive force can be returned to the power regeneration unit 1a of the power supply device 1 and regenerated to effectively use the power.

Thus, in the embodiment, the counter electromotive force V1 generated in the magnet coil L1 is not returned to the drive power supply line 3 as in the prior art, but via a counter electromotive force line that is a separate wiring from the drive power supply line 3. since then returned to the power regeneration unit 1a Te, for example by back EMF V1 generated in the magnet coil drive section 2 ₁ of any linear feeder 16, the magnet coil driving unit 2 ₂ of other linear feeder 16, ..., 2n Thus, the magnet coil L1 of each of the magnet coil driving units 2 ₂ ,..., 2n can be driven with a constant drive voltage V0. Thereby, the magnitude of the magnetic force of the magnet coil L1 in each of the magnet coil driving units 2 ₁ ,..., 2n is made constant, and the amplitude of the vibration of the vibrating body that is attracted and vibrated, that is, the trough 17 The amplitude is stabilized, and the conveyance amount of the object to be weighed 11 can be stabilized.

  Further, in this embodiment, since the plurality of rectilinear feeders 16 are driven by one power supply device 1, the cost can be reduced as compared with a configuration in which a power supply device is provided for each rectilinear feeder 16.

In the embodiment, the back electromotive force generated in the magnet coil L1 of each magnet coil drive unit 2 ₂ ,..., 2n is supplied to the power supply device via the back electromotive force line 4 which is a separate wiring from the drive power supply line 3. In the case where the counter electromotive force is not regenerated, the counter electromotive force is supplied to a circuit unit other than the power regeneration unit 1a in the power supply device 1 via a counter electromotive force line. You may make it return.

1 Power supply 2 ₁ , 2 ₂ , ... 2n Magnet coil drive unit 3 Drive power supply line 4 Back electromotive force line 14 Dispersion feeder 15 Supply hopper 16 Straight feed feeder 17 Trough 18 Vibration transfer device

Claims (4)

A power supply;
A plurality of magnet coil driving units each having a magnet coil therein;
Have
The power supply device includes: a voltage control unit that applies a drive voltage to one end side of the magnet coil; and a power regeneration unit that regenerates a counter electromotive force generated on the other end side of the magnet coil when the application of the drive voltage is interrupted. Have
Wherein the plurality of magnet coil driving unit, the one end of each of the magnet coil, while having the configuration in which the driving voltage is applied via the same drive power supply line from the voltage controller in said power supply device , each of the with the interruption of the application of the drive voltage to the one end of the magnet coil, separate wires the counter electromotive force generated in the other end of each of the magnet coil and the drive power supply line A vibration transfer device, which is introduced into the power regeneration unit in the power supply device via a certain counter electromotive force line. Each of the magnet coil driving units has a first switching element, a magnet coil, and a second switching element connected in series in this order to the driving power supply line from the voltage control unit in the power supply device . provided with a first path comprising, as applied and its cut-off of the drive voltage the with respect to the one end of the on-off of the two switching elements through the driving power supply line the magnet coils of the first path is controlled Has become,
The vibration conveyance apparatus according to claim 1. In each of the magnet coil driving units, a cathode of a first diode is connected to the counter electromotive force line to the power regeneration unit in the power supply device , and an anode of the first diode is connected to one end side of the magnet coil, provided with a second path which the other end of the magnet coil is connected to the cathode of the second diode, the second path, when the counter electromotive force to said magnet coil is generated, the both diodes are conducting doing, the counter electromotive force said generated through the back EMF line so as to form a path for introducing the power regeneration unit in the power supply device,
The vibration conveyance apparatus according to claim 1 or 2. A dispersion feeder that disperses the objects to be weighed in the peripheral direction, a plurality of linear feeders that are radially provided around the dispersion feeder and respectively convey the objects to be weighed from the dispersion feeder, and each linear feeder A plurality of supply hoppers that hold the objects to be weighed from the respective linear feeders and discharge them downward, and are provided corresponding to the respective supply hoppers, and the objects to be weighed supplied from the respective supply hoppers are respectively In a combination weigher comprising a plurality of weighing hoppers for holding and weighing the held objects to be weighed,
The vibration conveying apparatus according to any one of claims 1 to 3,
Each of the plurality of rectilinear feeders is driven by each magnet drive unit of the vibration conveyance device,
A combination weigher characterized by that.

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