JPH0536111B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in self-excited resonant vibration devices.

[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 conveying 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 seeks 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.In such a case, conventionally, two vibration drivers from the power amplifier 3 to the vibration driver M 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. In addition, a phase shift circuit is provided to advance the output phase of the power amplifier 3 as described above, but conventionally, a differential type is used, so it is susceptible to noise and suffers from stability issues. There was a problem that it was undesirable.

This invention was made to solve the above-mentioned conventional problems. Even if the vibration detector is installed in the wrong direction, the output phase of the power amplifier can be corrected with a single switch operation, and the output phase due to noise can be corrected. The object of the present invention is to obtain a self-excited resonant vibration device that can prevent phase fluctuations and improve stability.

[Means for solving problems]

In order to achieve the above object, in the first aspect of the present invention, the phase shift circuit section is composed of a first-order delay element and a phase inverter, and an external switch is provided for switching the phase inverter to non-phase inverting operation. It is something. In addition, in the second aspect of the invention, the delay characteristic of the primary delay element is made variable so that the characteristic can be controlled by an external signal to stop the vibration.

[Embodiments of the invention]

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

In FIG. 1, 10 is a phase shift circuit section,
The vibration signal v of the vibration detector 2 is guided and its output signal is supplied to the power amplifier 3. This phase shift circuit section has a phase shifter 11 and a phase inverter 12. As shown in FIG. 2, this phase shifter 11 is made up of two first-order delay elements (integrators) 13A, 13B connected in series, and each integrator 13, 13B is controlled by adjusting a variable resistor _r1. , π~3π/with respect to the input phase
Since the output with a phase delay of 2 is sent out, the phase shifter 11
The output has a phase delay of 0 to π with respect to the vibration signal v. The + terminal of the operational amplifier A in the phase inverter 12 is connected to the output phase invert switch (phase inverter 1
2 is grounded via a phase non-inverting switch 14, and when the switch 14 is open, the phase inverter 12 outputs 0 to the vibration signal v.
A signal having an advanced phase in the range of ~π can be extracted. When the switch 14 is turned on, a signal having a phase delay of 0 to π with respect to the vibration signal v is taken out from the phase inverter 12. C is a capacitor, and r ₂ , r ₃ , r ₄ , and r ₅ are resistors. 15 is a power switch, and 16 is a DC power source. 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 output of the transfer circuit section 10 is π/
The variable resistor r ₁ is adjusted so that the leading phase of the vibration detector 2 is set, and 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 It is assumed that the phases are the same, the power switch 15 is turned on, and the component transport device 1 is vibrating. The vibration signal v is amplified by an amplifier (not shown) and supplied to the phase shift circuit section 10.
The phase shift circuit unit 10 outputs π/2 to the vibration signal v.
Since the signal v _{+ whose} phase is advanced by
3 supplies the vibration driver M with pulsed power whose frequency is the natural frequency ω ₀ and whose phase is a lead phase of π/2 with respect to the vibration phase of the component transport device 1, and the vibration driver M receives this power. The elastic body 10
Bowl 1 of parts conveying equipment 1 by applying an excitation force to 3
Vibrate 02.

In this embodiment, when the switch 14 is turned on,
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 15 is turned on and a shock is applied to the component transport device 1, no vibration will occur), simply turning on the switch 14 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.

Further, since the phase shift circuit section 10 can advance the output phase in the range of 0 to π with respect to the phase of the vibration signal v, the component transport device 1 Not only can it be made to vibrate at its natural frequency ω ₀ , but it can also be operated with an advanced phase of (90°+α) shifted from the above natural frequency, and the necessary stability can be easily obtained. Moreover, this phase shift circuit section 1
Since 0 uses a delay element to extract a leading phase signal, it has the advantage of being resistant to noise compared to the case where a differential type is used. Of course, the phase shifter 12 of the phase shift circuit section 10 may be composed of one first-order lag element, or may be composed of a first-order lag element with fixed delay characteristics.

Furthermore, as mentioned 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. The output phase of the transfer circuit section 10 is controlled by controlling the resistance value of the resistor _r1 of the first-order delay element 13A (for example, by using a semiconductor element or a combination of a semiconductor element and a resistor as the resistor _r1 ) using the switch output. For example, if the vibration signal v is set to be in the same phase as the vibration signal v, the vibration of the component transport device 1 can be suppressed more quickly when the power switch 15 is opened by simply applying an external signal without having to open the power switch 15. It becomes possible to stop it.

Further, although the switch 14 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 15 is turned on. By providing the element, the output phase of the phase shift circuit section 10 can be automatically corrected even if the vibration detector 2 is installed in the opposite direction.

〔Effect of the invention〕

As explained above, in this invention, the phase shift circuit section is composed of a first-order delay element and a phase inverter, and
By configuring this phase inverter to operate in a non-inverting manner by operating an external switch, even if you install the vibration detector in the wrong direction, you can save yourself the trouble of reinstalling it or switching and connecting the power cables. Moreover, it has the advantage of being able to reduce fluctuations in the vibration phase due to noise.Furthermore, since the delay characteristics of the primary delay element are controlled by an external signal, the vibration can be stopped without operating the power switch. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of this invention.
FIG. 2 is a circuit diagram of the transfer circuit section 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 the component transfer device. DESCRIPTION OF SYMBOLS 1... Vibration equipment, 2... Vibration detector, 3... Power amplifier, 10... Transfer circuit section, 11... Phase shifter, 12... Phase inverter, 13A, 13B... First-order delay element, 14 ...Output phase inversion switch.

Claims (1)

[Claims] 1. A vibration detector that detects vibrations of a vibrating device, a phase shift circuit unit that advances the phase of an output signal of the vibration detector, and a phase shifting circuit unit that amplifies the signal supplied from the transfer circuit unit to detect the vibrations. In a self-excited resonant vibration device having a power amplifier that supplies a power amplifier to a vibration driver of a device, the transfer circuit section includes a first-order delay element and a phase inverter,
A self-excited resonant vibration device characterized by having an external switch for output phase inversion. 2. A vibration detector that detects the vibration of the vibration equipment, a phase shift circuit that advances the phase of the output signal of the vibration detector, and a signal supplied from the transfer circuit that amplifies the signal and sends it to the vibration driver of the vibration equipment. A self-excited resonant vibrating device having a power amplifier to supply power, which has an operation stop switch, and wherein the transfer circuit section includes a first-order delay element with variable delay characteristics and a phase inverter, and has an external switch for output phase inversion. A self-excited resonant vibration device characterized in that the delay characteristic of the first-order delay element is controlled by the switch output of the operation stop switch.