JPS593364B2 - Output control device that controls the power supplied to the vibrating supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an output control device that controls power supplied to a supply device using vibration, and particularly to an output control device that can be shut off with a low current.

Vibrating feeders for feeding small parts such as screws, nuts, plastic parts, etc. are typically driven by alternating current and are provided with a vibratory force at 60 Hz or 120 Elz.

In the case of a ball (container) type feeding device, the ball into which the parts are placed is provided with a track section that gradually extends upward from the inside in a spiral trajectory along its local part, and the ball itself is placed in the middle part of the feeding device. Additionally, the intermediate portion is supported on the base portion.

The intermediate portion is connected to an AC power source via an output power control device, and applies vibration to the ball by electromagnetic force.

When the ball vibrates, parts within the ball are moved upward along a spiral track.

The vibrating intermediate section of a vibratory feeder is usually an inductive impedance that imposes a large damping load on the power supply.

Various control devices are used to regulate the amount of power sent from the AC power source to the vibratory supply device.

These output control devices each have a vibration type supply device with a frequency of 60Hz.
Or driven using half wave or full wave depending on whether it is vibrated at 120Hz or not.

In this case, a portion of each cycle of the supply voltage (or, in the case of 120 Hz, a soil cycle) is supplied to the vibrating feeder via the output control device.

One method of controlling the amount of power sent to the supply device is to reduce the applied voltage through a voltage divider circuit consisting of an impedance.

Another known method is to apply only a portion of each cycle or each half cycle of the AC mains voltage to the supply device.

A thyristor circuit is used as the control circuit; when full wave is used, the thyristor is conductive at one point in each half-cycle of the AC mains voltage and powers the supply device in the other half-cycle.

On the other hand, when using this type of supply and control device,
When parts become clogged in the track connecting the supply device to the next processing step, it is necessary to temporarily stop the power supply to the supply device.

Conventionally, sensors are placed on the track to check whether parts are stuck in the track, and these sensors operate a high-current switch placed on the power supply line, causing the control device to control the vibration supply device. The power supply was set to be cut off.

These switches are inserted directly onto the line connected to the AC power supply carrying the full load current of the supply, resulting in a current of the order of amperes flowing through the switches.

In order to control such a large current, a large relay or the like is required, and as a result, the contact points are frequently worn and the life of the relay is shortened.

SUMMARY OF THE INVENTION It is therefore an object of the invention to provide an output control device for a vibrating feeder which can be switched at low currents.

It will be understood that the invention is not limited to the illustrated embodiments, but includes modifications within the spirit of the claims.

Hereinafter, the present invention will be explained along with preferred embodiments.

The vibrating feeding device 11 shown in FIG. 1 includes a ball 12 into which parts are placed, a base portion 13, and a vibrating portion 15 located between the two.

When the ball 12 vibrates, the parts 14 inside the ball 12 are moved along a track section 16 provided along the inner circumferential side of the ball 12 to a linear track section 17 outside the ball 12.

This part 14 is further sent from the track section 17 to the next processing section (not shown).

Further, as shown in FIG.
For example, it is connected to an AC power source of 60 flz via the AC power source.

Further, the output control device 18 is connected to the supply device 11 via a conductive wire 21, and when the supply device 11 is supplied with power, the output control device 18 is caused to vibrate.

The output control device 18 is equipped with a switch 22 and a knob 23 for setting the output to the supply device 11.

A switch 26 is connected to the output control circuit 18 via a conductive wire 24, and functions to cut off power sent to the supply device 11 via the conductive wire 21, as will be described later.

Switch 26 is controlled by a sensor 27 which detects a blockage of part 14 in position 28 .

When the part 14 gets stuck in the track section 17, the track section 17
This will cause problems in the next downstream process.

Therefore, it is necessary to use a sensor to detect clogging of the part 14, and when the clogging of the part 14 is detected, the switch 26 is actuated to cut off the low current being sent to the supply device 11.

FIG. 2 shows a circuit as an example of the output control device 18 of FIG. 1.

The inductive impedance load of the supply device 11 is very large and the supply device 11 is connected across a small value resistor 31.

Further, a series circuit of the resistor 31 and the triac 32 is connected to both ends of a conductive wire 19 connected to an AC power source.

The switch 22 is connected in series to one line of the conductive wire 19, that is, connected in series to a series circuit of a resistor 31 and a triac 32, and controls alternating current power to the control device 11.

When the triac 32 is non-conducting, a minimum current will flow through the supply device 11 and the supply device 11 will be substantially turned off.

On the other hand, when the triac 32 becomes conductive, the supply device 11 is fully energized.

During normal operation, the triac 32 is conductive for each cycle or half cycle of the AC power supply voltage, and the output to the supply device 11 is determined by the length of time that the triac 32 is conductive.

In order to control the triac 32 and provide a desired amount of power to the supply device 11, a capacitor 33 is provided so as to be chargeable via a charging line, and the discharge voltage of this capacitor 33 provides a trigger pulse to the gate of the triac 32. It will be done.

That is, when the voltage of capacitor 33 reaches the breakover voltage of diac 34, a trigger pulse is generated to the gate of triac 32, causing the triac to conduct.

When using the present device, for example, at 1201 (z), a jumper wire 36 is connected in parallel across the diode 37, and the voltage of the capacitor 33 is applied to the diac 34.

For this purpose, two trigger pulses, one positive and one negative, are applied to the triac 32 for each cycle of the power supply voltage.

The voltage Ve at the gate of triac 32 is shown in FIG. 3E.

If jumper wire 36 is not connected across diode 37, only the positive voltage of capacitor 33 (relative to line 40) is applied to diac 34 via diode 37.

That is, only an internal pressure pulse having a waveform indicated by Ve in FIG. 3E is generated.

Two charging lines from an AC power source are formed to capacitor 33 in order to provide positive and negative voltages to capacitor 33.

That is, the first charging line includes the line 50 and the jumper line 3.
8 or a switch 26, a potentiometer 39 and a resistor 41.

A relatively small resistor 31 is inserted into a line 50 connected to a conductive line 19 for inputting an AC power source, and a supply device 11 as a braking load is connected in parallel to the resistor 31.

Also, a triac 32 is connected to the opposite side of the line 50 from the resistor 31.
The - of the main terminals of the triac 32 are connected, and when the triac 32 is made conductive, the line 50 is connected to the line 40.

When triac 32 is non-conducting, line 50 is at approximately the AC mains voltage level and capacitor 33 is charged via potentiometer 39 and resistor 41.

In each cycle of the power supply voltage, the capacitor 33 can also be charged by a second charging line branched from a line 45 connected to one end of the conductive line 19 of the AC power supply via the switch 22 at the trigger timing for the triac 32. It can be expanded by providing the

The potential of line 45 is substantially independent of the state of triac 32, and capacitor 42 is charged via a resistor 43 connected to one end of the AC power supply.

Due to the discharge voltage of the capacitor 42, the potentiometer 44
Capacitor 33 can be charged via.

Assuming that the operation of the circuit of the output control device 18 starts from a positive half cycle and considering the potential of the line 45 with respect to the potential of the line 40, the operation will be further described in detail below.

Since the initial triac 32 is in a conductive state, the supply device 1
1 (see FIG. 3A).

A voltage vb shown in FIG. 3B is applied to both ends of the triac 32, and the sum of the voltages Va and vb is of course
It is equal to the AC power supply voltage between 0 and 0.

From the start of the positive pulse of the half cycle until time t3, the input voltage is applied across the supply device 11.

Since the inductive inductance of the supply device is large, the triac 32 remains conductive until the initial time t3 due to the reverse current generated in the triac 32 and the supply device.

When the triac 32 becomes non-conductive at time t8, the supply device 11 is de-energized and the supply voltage is applied across the triac 32.

If a full wave of supply voltage is used, time t4 in the negative cycle substantially corresponds to time t3 in the positive half cycle.

During the positive half-cycle of the supply voltage, the voltage Vc (see FIG. 3C) across capacitor 42 is positive, and capacitor 42 is charged from line 45 through resistor 43 and is connected to the capacitor for the gate trigger of triac 32. 33 is charged via a potentiometer 44.

On the other hand, when the triac 32 becomes non-conductive, the capacitor 33 is charged via the charging line of the line 50, the potentiometer 39, and the resistor 31.

When the voltage Vd across capacitor 33 (see FIG. 3D) reaches the breakover voltage of diac 34, triac 32 becomes conductive again at time t1 in FIG.

At this time, the voltage vb applied to the triac 32 returns to zero again, and the power supply voltage is again applied to both ends of the supply device 11.

At time t1, the voltage Vc across the capacitor 42 drops slightly, and the voltage Vd across the capacitor 33 drops even more.

As described above, the trigger pulse Ve (see FIG. 3E) is applied at time t1.

When the voltage of the charged capacitor 33 reaches the breakover voltage of the diac 34, a trigger pulse is generated;
The magnitude of the trigger pulse is determined by the potentiometers 39, 4.
By setting 4, a suitable value can be obtained.

The smaller the resistance value of each potentiator 39, 44,
Capacitor 33 is quickly charged each half cycle and triac 32 is turned on early.

In this case, the voltage applied to the supply device 11 becomes smaller, and the conduction time t1 of the triac 32 changes to Y in FIGS. 3A-E.
It will be appreciated that moving to the side of the axis or to the right, the non-conduction time t3 of triac 32 moves to the side of the start of the positive half cycle of the supply voltage, or to the left.

The reason why the non-conduction time of the triac 32 is brought forward in this manner is that the residual current in the supply device 11 decreases as the conduction time decreases at the end of the previous half cycle.

Therefore, the power supply to the supply device 11 can be controlled almost continuously via the output control device 18.

The faster the triac 32 becomes conductive, the more power is sent to the supply device 11.

The value of the potentiometer 44 is preferably set in advance, and the amount of power supplied to the supply device 11 can be adjusted according to the set value of the potentiator 39, so it is preferable to provide it so that it can be controlled by the knob 23 as needed.

When adjusting the output control device 18, the potentiometer 3
9 is set to the maximum resistance value, and the charging current of the capacitor 33 is set to the minimum value.

Next, the potentiometer 44 is adjusted so that tl coincides with the intersection to of the Y-axis and the amount of power supplied to the supply device 11 is minimized.

Further, when using a full wave, the potentiometer 44 is controlled so that time t2 similarly coincides with the intersection of the Y-axis and the Y-axis of the next cycle.

After the potentiometer 44 is adjusted in this way, the resistance value is lowered by the potentiometer 39 and the capacitor 3 is adjusted.
3 so that the triac 32 is triggered quickly.

Thus, by adjusting the potentiometer 39 to trigger the triac 32 at the appropriate time of each cycle or half-cycle, the power delivered to the supply device 11 can be regulated.

According to the present invention, the switch 26 can be connected in series with a potentiometer 39 and a resistor 41 forming a charging path for the capacitor 33.

If the switch 26 is attached within the charging line, the jumper wire 38 is omitted.

As mentioned above, the switch 26 shown in FIG.
8 and is controlled by a sensor 27 that detects clogging of the parts 14 on the track section 17 of the feeding device 11.

When switch 26 is turned off, potentiometer 39
Then, the charging line of the resistor 41 is opened, and the amount of supply from the output control device 18 to the supply device 11 becomes the minimum value.

It will be appreciated that by arranging the switch 26 on the charging line as described above, there is no need to provide a switch connected in series with the supply device 11 to cut off the high current.

Also in this case, resistor 43 and potentiometer 44
Since there is a second charging line consisting of , the current flowing through the switch 26 in the first charging line is less than the total charging current flowing through the capacitor 33 that triggers the triac.

Typically, the current flowing through the charging line is on the order of milliamps, while the current flowing through the supply device 11 is on the order of amperes.

The output control device 18 includes a conductive wire 2 connected to a power source.
Further varistors 46 and 47 are provided to limit transient voltages that occur across the triac 32 and the triac 32.

Further, a buffer circuit including a resistor 48 and a capacitor 49 connected in series is provided between the triacs 32 to limit a sudden voltage rise occurring between both ends of the triacs 32.

In addition, in the above-mentioned embodiment, the ball vibrating type supply device 11 includes:
Although the above-described output control device has been shown to be suitable, it will be appreciated that it can also be used in other types of vibratory part feeding devices.

For example, it can be used in a device that feeds parts by vibration from a hopper that stores parts.

According to the present invention, it will be clear from the above that the output control device for supplying power to a vibratory type supply device has the advantage of requiring a small current when cutting off the supply device in response to an external detection operation. .

In addition, a switch provided outside the output control device can be shut off in response to the feeding state of parts or other conditions of the vibration supply device, and can be operated smoothly and appropriately with a simple configuration, and can extend its life. Moreover, since there is no need to use large relays with low durability, the overall cost can be reduced.

The embodiments of the present invention are summarized as follows.

(1) A supply device having a track section for supplying parts by vibration, a thyristor whose main terminals are respectively connected to an AC power source and the supply device and having a gate, a capacitor connected to the gate of the thyristor, and the AC An output control device comprising a remotely controllable switch attached to a charging line from a power source to the capacitor.

1(2) The output control device according to the above item (1), which includes a sensor for detecting clogging of parts on the track portion of the supply device and controlling a remote control switch.

(3) The output control device includes a second charging line, and a resistor and a second capacitor are connected in series between the second charging line and the AC power source, and the second capacitor and the first The output control device according to item (1) above, comprising a potentiometer connected between the capacitor and the capacitor.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the output control device of the present invention applied to a vibrating type supply device, FIG. 2 is a circuit diagram of the same output control device, and FIG.
Figures A through 3E are explanatory diagrams of the same operation. 11... Supply device, 12... Ball,
13...Base, 14...Parts, 15
... Vibration part, 16°17 ... Raceway part,
18...Output control device, 19°21...
・Conductive wire, 22...Switch, 23...
・Knob, 24... Conductive part, 26... Switch, 27... Sensor, 31... Resistor, 32... Triac, 33...
・Capacitor, 34... Diac, 36...
...Jumper wire, 37...Diode,
38... Jumper wire, 39... Potentiometer, 40... Line, 41...
・Resistor, 42...Capacitor, 43...
...Resistor, 44...Potentiometer, 45
・・・・・・Railway, 46.47・・・Barista,
48...Resistor, 49...Capacitor, 50...Line.

Claims (1)

[Scope of Claims] 1. The device has a plurality of main terminals and a gate, and is triggered via the gate, and when in the first state, power is supplied from the AC power source to the supply device that feeds the parts by vibration, and when the device is in the second state, When the supply of power to the supply device is stopped, at least one of the plurality of main terminals is connected to the supply device, and at least one of the plurality of main terminals is connected to the AC power source. a thyristor, a capacitor connected between the gate of the thyristor and one of the plurality of main terminals and capable of triggering the thyrist; a charging line supplying a power supply voltage to the capacitor; and a charging line linked to the charging line; An output control device for controlling power supplied to a vibration type supply device, comprising a switch for changing the impedance of the charging line. 2. The output control device according to claim 1, further comprising a second capacitor connected to an AC power supply via a second charging line and connected to the first capacitor via another charging line. 3. The output control device according to claim 2, comprising an external sensor for controlling a switch associated with a charging line from an AC power supply to the first capacitor. 4. The output control device according to claim 3, wherein one of the main terminals of the thyristor is connected to a supply device, and the other main terminals are connected to an AC power source. 5 Claims in which a first potentiometer is attached to the charging line of the first capacitor, and a second potentiometer is attached to the charging line between the first capacitor and the second capacitor. The output control device according to item 4.