JPH0242664Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of a self-excited resonant vibration device.

[Conventional technology]

Conventionally, this type of vibrating device was
There is one described in Publication No. 88282.

FIG. 3 shows a block diagram of the configuration of this type of conventional vibrating device, in which 1 indicates a vibrating device, e.g.
It is a parts conveyance device such as a parts feeder, and as shown in FIG. ,
It has an electromagnet 104, a suction plate 105), and vibration isolating legs 106. 2 is a vibration detector, for example,
In the case of a magnetic type vibration detector, it is placed opposite to a vibrating body such as the bowl 102 or the elastic body 103.
A power amplifier 3 amplifies the power of the vibration signal v detected by the vibration detector 2, and supplies power having a positive phase with respect to the vibration signal v to the coil of the electromagnet 104. Note that this power amplifier 3 has a function of automatically adjusting the width of the current pulse flowing through the coil of the electromagnet 104.

In this vibrating device, when the bowl 102 is vibrated, the vibration detector 2 detects the generated vibration and sends out a vibration signal v, and the power amplifier 3 amplifies the power of this vibration signal to coil the electromagnet 104. Therefore, the electromagnet 104 exerts an electromagnetic force (excitation force) proportional to the magnitude of the supplied electric power on the suction plate 105, and the bowl 102 is moved under the conditions and loads (components inside the bowl 102) specific to the transport equipment. , and external conditions _such as grounding conditions.

[Problem that the invention attempts to solve]

In this type of vibration device, the phase of the power supplied to the vibration driver M must basically be advanced by π/2 with respect to the phase of the vibration signal v, so the vibration detector 2 may be installed in the wrong direction. , when the vibration phase of the component transport device 1 is taken out with an opposite phase, the component transport device 1 cannot be vibrated. Since the voltage phase applied to the vibration driver M must be manually corrected by replacing and connecting the feeder lines, the problem is that it is troublesome and time-consuming.

This idea was devised to solve the above-mentioned conventional problems. Even if the vibration detector is installed in the wrong direction, the self-excited resonant vibration type allows the output phase of the power amplifier to be corrected with a single switch operation. The purpose is to obtain equipment.

[Means to solve the problem]

In order to achieve the above object, this invention inserts a phase inverter in series with the phase shifter, and provides a switch for switching the phase inverter to non-phase inverting operation.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a phase shifter, into which the vibration signal v of the vibration detector 2 is guided, and its output signal is sent to the phase inverter 11. This phase shifter is a differential type lead circuit, and outputs the phase of the vibration signal v with a lead phase of 90 degrees. The phase inverter 11 has a phase invert switch 12, and as shown in FIG. When the switch 11 is closed, a signal having a phase lead of 90 degrees with respect to the vibration signal v can be taken out from the phase inverter 11. When the switch 12 is open, a signal having a phase delay of 90° with respect to the vibration signal v can be taken out from the phase inverter 11. r ₁ , r ₂ , r ₃ are resistances.
13 is a power switch, and 14 is a DC power supply. Note that since the other configurations are the same as those shown in FIG. 3, the same components are given the same reference numerals and their explanations will be omitted.

Next, the operation of this vibration device will be explained.

In terms of vibration engineering, the phase of the vibration of the component conveying device 1 that vibrates in response to the excitation force of the vibration drive element M is generally delayed in the range of 0 to π, and is dependent on the frequency ω of the excitation force and the vibration device rigidity. When the natural frequencies ω ₀ of ω 0 match, it becomes π/2. When ω<ω ₀ , it is smaller than π/2, and when ω>ω ₀ , it is larger than π/2.

Now, the mounting direction of the vibration detector 2 is correct, that is, the phase of the vibration signal v sent by the vibration detector 2 and the vibration phase of the component transport device 1 are in the same phase, the phase reversal switch 12 is closed, and the power supply is turned off. It is assumed that the switch 13 is turned on and the component transport device 1 is vibrating. The vibration signal v is amplified by a vibrator (not shown) and supplied to the phase shifter 10. The phase shifter 10 outputs a signal whose phase is advanced by π/2 with respect to the vibration signal v.
Since the signal v ₊ is sent out and the signal v ₊ is supplied to the power amplifier 3, the frequency of the power amplifier 3 is the natural frequency ω ₀ , and the phase is π/2 with respect to the vibration phase of the component transport device 1. A pulsed power having an advanced phase is supplied to the vibration driver M, and the vibration driver M operates upon receiving this power, exerts an excitation force on the elastic body 103, and vibrates the bowl 102 of the component transport device 1. .

In this embodiment, when the switch 12 is opened,
The power amplifier 3 has π/with respect to the phase of the vibration signal v.
Since a signal having a phase delay of 2 is supplied, the phase of the vibration signal v is opposite to the vibration phase of the component transport device 1 because the vibration detector 2 is installed in the opposite direction. (In this case, even if the power switch 13 is turned on and a shock is applied to the component transport device 1, no vibration will occur), simply opening the switch 12 will change the output phase of the power amplifier 3 to the component transport device. π/2 for the vibration phase of device 1
The leading phase can be set as follows.

In the above embodiment, the phase shifter 10 obtains a signal with a phase leading by π/2 with respect to the phase of the vibration signal v. Stability can be improved by operation, and if a phase shifter 10 with an adjustable phase angle is used, the required stability can be easily obtained.

Further, in the above embodiment, the phase shifter 10 is of a differential type, but an integral type may also be used. A signal can be extracted, and by closing the switch 12, a signal with a delayed phase relative to the vibration signal v can be extracted. Therefore, according to the present invention, the phase shifter 10 can be conveniently used as either a differential type or an integral type.

Furthermore, as described above, in order to make the component transport device 1 self-excited and resonate, it is necessary to basically advance the output phase of the power amplifier 3 by π/2 with respect to the vibration signal v. Even if the circuit is not opened, by switching the state of the switch 12 in the opposite direction, it is possible to stop the vibration of the component transport device 1 more quickly than when the power switch 13 is opened.

Further, although the switch 12 has been described as a manual switch, for example, a switching transistor is used, and the base current is supplied to the transistor on the condition that there is no vibration signal v after a certain period of time has elapsed after the power switch 13 is turned on. By providing the element, the output phase of the phase shifter 10 can be automatically corrected even if the vibration detector 2 is installed in the opposite direction.

[Effect of idea]

As explained above, this device connects a phase inverter in series with a phase shifter, and by operating a switch, the phase inverter is configured to operate in a non-inverting manner, so that the vibration detector can be installed in the wrong direction. This saves you the trouble of reinstalling or replacing and connecting power cables.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an embodiment of this invention.
FIG. 2 is a circuit diagram of the phase inverter in the above embodiment, FIG. 3 is a block diagram showing a conventional resonance type vibration device, and FIG. 4 is a side view of a component conveying device. DESCRIPTION OF SYMBOLS 1... Vibration device, 2... Vibration detector, 3... Power amplifier, 10... Transfer device, 11... Phase inverter, 12... Output phase inversion switch.

Claims (1)

[Claims for Utility Model Registration] (1) A vibration detector that detects the vibration of a vibrating device, a phase shifter to which the output signal of the vibration detector is guided, and a signal supplied from the phase shifter that is amplified to produce the above-mentioned A self-excited resonance type comprising a power amplifier that supplies a vibration driver of a vibration device, a phase inverter connected in series with the phase shifter, and the phase inverter having a switch for phase inversion. Vibration device. (2) The self-excited resonant vibration device according to claim 1, wherein the phase shifter is an integral phase shifter. (3) The self-excited resonant vibration device according to claim 1, wherein the phase shifter is a differential phase shifter.