JP2002068454A - Electromagnetic vibration type carrying device and metering device provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic vibration type of carrying device capable of being driven with a simple and low-cost circuit structure. SOLUTION: The electromagnetic vibration type carrying device 1 for carrying commodities M by vibrating a carrying portion 4 with magnetic force generated by an electromagnetic coil 11 comprises a regenerative capacitor 26 connected in parallel between a power supply 18 and the electromagnetic coil 11, a first switch 35 to be opened and closed with driving signals (c) from the outside for supplying power from the power supply 18 or the regenerative capacitor 26 to the electromagnetic coil 11 with the closed operation and stopping the supply of power with the closed operation, and a second switch 36 to be operated in linkage with the opening operation of the first switch 35 for supplying power accumulated in the electromagnetic coil 11 to the regenerative capacitor 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic vibration type transfer apparatus for transferring articles by vibrating a transfer section by a magnetic force generated by an electromagnetic coil and a weighing apparatus provided with the same.

[0002]

2. Description of the Related Art As a conventional transfer device of this kind, two switching elements Q1 and Q2 of a circuit shown in FIG.
There is known a device in which a drive current is intermittently supplied to an electromagnetic coil L by performing off control (utility model registration 2561).
418). In this circuit, two driving circuits A and B
, The switching signals Q1 and Q2 are input to the corresponding switching elements Q1 and Q2 in synchronization with each other, whereby both the switching elements Q1 and Q2 are turned on, and the switching element Q1 → the electromagnetic coil L → A drive current flows to the negative side of the power supply E via the path of the switching element Q2. When the on signals a and b stop, both the switching elements Q1 and Q2 are turned off.
Back electromotive force is generated by the energy stored in the
A feedback current caused by the back electromotive force flows from the negative side of the power supply E to the positive side of the power supply E via a path of the diode D1 → the electromagnetic coil L → the diode D2, and is collected by the regenerative capacitor C.

[0003]

However, in the transfer device having the above-described circuit configuration, in order to intermittently supply a drive current to the electromagnetic coil, the two drive circuits A and B turn on the corresponding switching elements Q1 and Q1. It is necessary to input the signals a and b in synchronization with each other, so that there is a problem that the circuit configuration is complicated and the cost is increased.

An object of the present invention is to solve the above-mentioned problems and to provide an electromagnetic-vibration transfer device which can be driven by a simple and low-cost circuit configuration.

[0005]

In order to achieve the above object, an electromagnetic vibration type transport apparatus according to the present invention transports an article by vibrating a transport section by a magnetic force generated by an electromagnetic coil. A regenerative capacitor connected in parallel between a power supply and the electromagnetic coil, opening and closing by a drive signal from the outside, and performing power supply to the electromagnetic coil from the power supply or the regenerative capacitor by a closing operation; A first switch that stops power supply by an opening operation, and a second switch that operates in conjunction with the opening operation of the first switch to supply the power stored in the electromagnetic coil to the regeneration capacitor. It has.

According to the above configuration, by opening and closing the first switch with an external drive signal, it is possible to supply and stop power from the power supply or the regenerative capacitor to the electromagnetic coil. Since no drive signal is required, the circuit configuration is simplified and the cost can be reduced. Further, the second switch is operated in conjunction with the opening operation of the first switch, and the power stored in the electromagnetic coil is recovered by the regenerative capacitor, so that power consumption can be reduced and heat generation in the electromagnetic coil is also suppressed. be able to.

In another preferred embodiment of the present invention, furthermore, the power supply which operates when the voltage across the regenerative capacitor falls below a reference value to supply power from the power source to the regenerative capacitor. It has a circuit. According to the above configuration, the regenerative capacitor is used as a power supply for the electromagnetic coil, and power is supplied from the power supply circuit only when the voltage across the regenerative capacitor falls below the reference value, so that power consumption can be further reduced. .

[0008] Further, a weighing device provided with an electromagnetic vibration type transfer device according to the present invention includes the electromagnetic vibration type transfer device having the above-described configuration, and further includes a weighing unit for weighing articles conveyed by the transfer device. Have.

According to the above configuration, the circuit configuration of the transport device for transporting the article to the weighing section is simplified, so that the weighing device can be configured simply and at low cost.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a transfer device of an electromagnetic vibration type. The transport device 1 includes a vibrator 2 and a trough 4 which is a transport unit attached to the vibrator 2 via a bracket 3. In addition, the vibrator 2
A base 7 attached to a gantry 5 to which the transfer apparatus 1 is attached via a plurality of elastic members 6 for vibration isolation; an electromagnet 8 attached to the base 7; a front part and a rear part of the base 7; A pair of parallel leaf springs 9 attached to the bracket 3 by bolts, and a movable core 1 fixed to the bracket 3 and facing the electromagnet 8.
0. The movable iron core 10 has one leaf spring 9
Is fixed to the bracket 3 at a position corresponding to the upper end.

Power is supplied from the drive circuit 15 to the electromagnet 8 to vibrate the bracket 3 via the leaf spring 9 in a vibration direction V which is substantially horizontal and slightly upward with respect to the trough 4 arranged in a horizontal posture. As a result, the article M placed on the trough 4 as the transport section is sent in the transport direction P.

FIG. 2 shows a specific configuration of the driving circuit 15. The drive circuit 15 includes a power supply section 16 and a drive section 17. The power supply unit 16 includes a DC power supply unit 18 including a full-wave rectifier circuit 19 including diodes 21 to 24 and a smoothing capacitor 20, a power supply circuit 25, and a regeneration capacitor 26. The DC power supply unit 18 converts the commercial AC voltage v into a DC voltage, and
Enter 5 The power supply circuit 25 operates when the inter-terminal voltage of the regeneration capacitor 26 falls below the reference value, and supplies power from the DC power supply unit 18 to the regeneration capacitor 26.

The power supply reinforcing circuit 25 includes a DC power supply 18
, A resistor 27 and a Zener diode 28 connected in series between both output-side poles, an FET 29 as a switch connected between the positive side of the DC power supply section 18 and the positive side of the regenerative capacitor 26, and a comparator 30. And two voltage dividing resistors 31 and 32 connected in series between both poles of the regenerative capacitor 26.

The connection between the two voltage dividing resistors 31 and 32 is connected to one input terminal of the comparator 30 and to the resistor 27.
And the Zener diode 28 are connected to the comparator 30
, And the output terminal of the comparator 30 is connected to the gate of the FET 29. Thereby, in the comparator 30, the voltage obtained by dividing the voltage between the terminals of the regeneration capacitor 26 by the voltage dividing resistors 31 and 32 is compared with the voltage between the terminals of the Zener diode 28, that is, the voltage between the terminals of the regeneration capacitor 26 is obtained. Is compared with a reference voltage obtained by dividing the voltage between the terminals of the Zener diode 28 by the voltage dividing ratio of the voltage dividing resistors 31 and 32, and the FET 29 is turned on / off according to the comparison result. That is, when the voltage between the terminals of the regenerative capacitor 26 falls below the reference value, the FE
An ON signal is input to T29, and the FET 29 is turned on (closed operation), whereby power is supplied from the DC power supply unit 18 to the regeneration capacitor 26. When the voltage between the terminals of the regeneration capacitor 26 is equal to or higher than the reference value, the FET 29 is turned off (opening operation).

When the power supply to the electromagnetic coil 11 of the electromagnet 8 is stopped in the drive unit 17, the regenerative capacitor 26
It is a capacitor for recovering the energy stored in the electromagnetic coil 11, and also serves as a power source for the drive unit 17.

The driving unit 17 includes a first switch FE
T35 and a bipolar transistor 36 as a second switch. One end 11a of the electromagnetic coil 11 is
The other end 11b of the electromagnetic coil 11 is connected to the positive electrode side of the regenerative capacitor 26 via the emitter-collector conductive path of the bipolar transistor 36, and connected to the negative electrode side of the regenerative capacitor 26 via the source / drain conductive path of the FET 35. It is connected to the.

A diode 37 is reversely connected between one end 11a of the electromagnetic coil 11 and the negative electrode of the regenerative capacitor 26, that is, the cathode is connected to one end 11a of the electromagnetic coil 11.
A is connected to the negative electrode side of the regeneration capacitor 26 at a. Also, the other end 11 of the electromagnetic coil 11
Another diode 38 is connected in series between b and the positive electrode side of the regenerative capacitor 26, that is, the cathode is connected to the positive electrode side of the regenerative capacitor 26, and the anode is connected to the other end 11b of the electromagnetic coil 11 respectively. I have. Further, a resistor 39 is interposed between the base of the bipolar transistor 36 and the other end 11b of the electromagnetic coil 11, and a signal input unit 40 for inputting an external drive signal c is connected to the gate of the FET 35. ing.

FIG. 3 is a schematic side view of a mechanism section of a combination weighing apparatus 50 provided with the electromagnetic vibration type transfer device 1 having the above-described configuration as a vibration feeder. Article M is supplied to supply chute 51
To the center of the short conical dispersion feeder 52. The vibrations of the dispersion feeder 52 are distributed and supplied to a plurality of vibration feeders (transport devices) 1 arranged radially.

Subsequently, the articles M are conveyed by each vibrating feeder 1 and sent to a plurality of pool hoppers 53 arranged on the circumference, and are temporarily pooled in accordance with the weighing operation.
The discharge gate 54 of the pool hopper 53 is opened and put into the weighing hopper 55. Each weighing hopper 55 includes a weight detector 56 such as a load cell connected thereto.
The weighing unit 57 is configured, and the weight detector 56 detects the weight of the article M stored in each weighing hopper 55 and outputs a weighing signal. The weighed article M is transferred to the weighing hopper 5
The fifth discharge gate 58 is opened and is collected by the collecting chute 59, and is discharged from the timing gate 61 at the lower end through the discharge chute 60. This discharged article M
Are packaged by a packaging machine (not shown) to form a bagged product having a target weight.

Next, the operation of the drive circuit 15 in the electromagnetic vibration type transfer apparatus 1 will be described below with reference to FIGS. 2, 4 and 5. The drive unit 17 of the drive circuit 15 of FIG.
At the signal input unit 40, the first switch F
As shown in FIG. 5A, the gate of the ET 35 has a predetermined period T (for example, 20 m) corresponding to the vibration period of the vibrator 2.
) is input. This drive signal c
When the FET 35 is turned on by the H level of the second transistor, the bipolar transistor 3 serving as the second switch is
When the base potential of the transistor 6 decreases, the bipolar transistor 36 also turns on. That is, the second switch 36 is closed in electrical interlock with the closing operation of the first switch 35. As a result, as shown in FIG. 4A, the electromagnetic coil 11 is routed from the positive side of the regenerative capacitor 26, which is the power supply, to the bipolar transistor 36 → the electromagnetic coil 11 → FET35 → the negative side of the regenerative capacitor 26. Drive current ia flows to excite the electromagnetic coil 11.

When the FET 35, which is the first switch, is turned off by the L level of the drive signal c, the second switch 35
The bipolar transistor 36, which is a switch, is also turned off because its base potential rises. That is, the second switch 3 is electrically connected to the opening operation of the first switch 35.
6 also opens. As a result, the path of the drive current ia is cut off, and the excitation of the electromagnetic coil 11 is stopped. As described above, the supply and stop of the drive current ia to the electromagnetic coil 11 can be performed by one drive signal c, and two drive currents are not required unlike the related art, so that the circuit configuration is simplified and the cost is reduced. Becomes

When the supply of the drive current ia is stopped, a counter electromotive force is generated in the electromagnetic coil 11. At this time, as shown in FIG. 4 (B), the return current ib due to the back electromotive force flows from the negative side of the regenerative capacitor 26 to the diode 37 → the electromagnetic coil 11 → the diode 38 → the positive side of the regenerative capacitor 26. The energy that flows through the path and is stored in the electromagnetic coil 11 due to the stop of the power supply is recovered by the regeneration capacitor 26. Thereby, the heat generation of the electromagnetic coil 11 due to the stored energy is reduced, and the power consumption can be reduced.

When the voltage between the terminals of the regenerative capacitor 26, which is the power supply voltage of the drive unit 17 in FIG. 2, is equal to or higher than the reference value, the voltage dividing resistors 31 and 3 in the power supply circuit 25 are used.
2, the voltage level divided by the Zener diode 28
Above a predetermined level given as the terminal voltage of
At this time, no ON signal is given from the comparator 30 to the FET 29 and the FET 29 is kept off, so that no power is supplied from the DC power supply section 18 to the regeneration capacitor 26 during this time. Conversely, when the voltage between the terminals of the regenerative capacitor 26 falls below the reference value, the voltage dividing resistors 31 and 3
2 is lower than a predetermined level. At this time, an ON signal is given from the comparator 30 to the FET 29 and the FET 29 is turned on, so that power is supplied from the DC power supply 18 to the regenerative capacitor 26. Will be As described above, only when the voltage between the terminals of the regenerative capacitor 26 falls below a certain level, power is supplied from the DC power supply unit 18 via the power supply circuit 25, so that power consumption can be further reduced.

In the above-described embodiment, the case where the electromagnetic vibration type transfer device 1 is incorporated in the combination weighing device 50 has been described. However, the present invention is not limited to such a combination weighing device, but may be a normal single type weighing device. Even if the apparatus is incorporated as a vibration feeder in the apparatus, the simplification of the configuration and the reduction in cost are similarly realized.

[0025]

According to the transfer device of the electromagnetic vibration type of the present invention, power can be supplied and stopped from the power supply or the regenerative capacitor to the electromagnetic coil only by opening and closing the first switch with an external drive signal. And the circuit configuration is simplified because two drive signals are not required unlike the related art.
Cost can be reduced. In addition, the second switch is closed with the closing operation of the first switch, and the power stored in the electromagnetic coil is recovered by the regenerative capacitor, so that power consumption can be reduced and heat generated by the electromagnetic coil is also reduced. Can be suppressed.

Further, according to the weighing device of the present invention, the weighing device includes the electromagnetic vibration type transfer device having the above-described configuration, and further includes the weighing portion for weighing the articles conveyed by the transfer device. Since the circuit configuration of the transport device for transporting articles to the weighing device is simplified, the overall configuration of the weighing device is simple and low in cost.

[Brief description of the drawings]

FIG. 1 is a side view showing an electromagnetic vibration type transport device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a drive circuit in the transport device.

FIG. 3 is a schematic side view of a mechanism section of the combination weighing device provided with the transfer device.

FIG. 4 is an explanatory diagram of an operation of a drive unit in the drive circuit.

FIG. 5A is a waveform diagram of a driving signal in the driving unit,
(B) is a waveform diagram of a current flowing through the electromagnetic coil.

FIG. 6 is a circuit diagram of a conventional example.

[Explanation of symbols]

1. Electromagnetic vibration type transport device, 4. Trough (transport portion), 1
DESCRIPTION OF SYMBOLS 1 ... Electromagnetic coil, 18 ... DC power supply part, 25 ... Power supply circuit, 26 ... Regeneration capacitor, 35 ... FET (1st switch), 36 ... Bipolar transistor (2nd switch), 50 ... Combination measuring device , 57… Measuring unit

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masanori Asai 219-46 Kuseri-Nishi, Joyo-shi, Kyoto F-term in Asai Electronics Research Laboratory (reference) 3F037 AA09 CA11 5D107 AA12 BB06 CC09 CD03 DD12

Claims (3)

[Claims] 1. An electromagnetic vibration type transport device for transporting an article by vibrating a transport unit by a magnetic force generated by an electromagnetic coil, comprising: a regenerative capacitor connected in parallel between a power supply and the electromagnetic coil. Opening and closing operation by an external drive signal, power supply from the power supply or the regenerative capacitor to the electromagnetic coil by closing operation, and stopping power supply by opening operation.
And a second switch that operates in conjunction with the opening operation of the first switch and supplies the electric power stored in the electromagnetic coil to the regenerative capacitor. 2. The electromagnetic vibration according to claim 1, further comprising a power supply circuit that operates when the voltage across the regeneration capacitor falls below a reference value and supplies power from the power supply to the regeneration capacitor. Type transfer device. 3. A weighing device comprising the transport device according to claim 1 and further comprising a weighing unit for weighing the articles transported by the transport device.