JPS6312380A - Self-excitation resonance type vibrator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in self-excited resonance type vibration devices.

[Conventional technology]

Conventionally, this type of vibrating device is
There is one described in Publication No. 82.

FIG. 3 is a block diagram showing the configuration of this type of conventional vibrating device, in which 1 is a vibrating device, for example, a parts conveying device such as a parts feeder, and as shown in FIG. , a bowl 102 that transports parts while aligning them, a plurality of elastic bodies 103 that support the balls, a vibration driver M (
In this example, an electromagnet 104, a suction plate 105), an anti-vibration leg 1
06. 2 is a vibration detector, for example,
In the case of a magnetic type vibration detector, the bowl 102 and the elastic body 1
The vibrator is placed opposite to the vibrator such as 03.

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 self-excitingly 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 machine 105, and the bowl 102 is moved under the conditions and loads (components inside the bowl 102) specific to the conveying equipment. , the natural frequency ω determined by external conditions such as grounding conditions. make it vibrate.

[Problem that the invention seeks to solve]

In this type of vibration device, the phase of the electric 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 must be mounted in the direction If you make a mistake and extract the vibration phase of the component transport device 1 with an opposite phase, the component transport device 1 will not be able to vibrate. The problem is that the phase of the voltage applied to the vibration driver M is corrected manually by switching and connecting the two feeder lines, which 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 in order 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. The object of the present invention is to obtain a self-excited resonant vibration device that can prevent fluctuations in the output phase and improve stability.

[Means to solve the problem]

In order to achieve the above object, the first invention includes the following:
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. 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, reference numeral 10 denotes a phase shift circuit section through which 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 composed of two first-order delay elements (integrators) 13A and 13B connected in series, and each integrator 13.13B is controlled by adjusting a variable resistor r. , π−3π for the input phase
Since the output of the phase shifter 11 has a phase delay of /2, the output of the phase shifter 11 has a phase delay of O to π with respect to the vibration signal V. The child terminal of the operational amplifier A in the phase inverter 12 is grounded via an output phase inversion switch (for the phase inverter 12, a phase non-inversion switch) 14, and when the switch 14 is open, The vibration signal V from the phase inverter 12
A signal having a leading phase in the range of O to π can be extracted. When the switch 14 is turned on, a signal having a phase delay of O to π with respect to the vibration signal V is taken out from the phase inverter 12. C is a capacitor, rz,
rs, r<, rs is a resistance. 15 is a power switch,
Reference numeral 16 denotes a DC power supply. 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 vibration engineering, the phase of the vibration of the component transport device 1 that vibrates in response to the excitation force of the vibration driver M is generally 0 to 0.
Delayed in the range of π, the frequency of the excitation force ω and the natural frequency ω of the vibrating equipment surface. When - loses, it becomes π/2. When ω<ω0, it is smaller than π/2, and when ω>ωG, it is larger than π/2.

Now, in the transfer circuit section 10, the variable resistance r is adjusted so that the output has a lead phase of π/2 with respect to the input, and the vibration detector 2 is installed in the correct direction, that is, the vibration detector 2 is in the forward direction. It is assumed that the phase of the vibration signal V and the vibration phase of the component transport device 1 are in the same phase, 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 section 10 sends out a signal V+ whose phase is advanced by π/2 with respect to the vibration signal V, and this signal V is supplied to the power amplifier 3, so that the power amplifier 13 has a frequency equal to the natural frequency. A pulsed power whose phase is ω0 and whose phase is a lead phase of π/2 with respect to the vibration phase of the component transport device 1 is supplied to the vibration driver M, and the vibration driver M receives this power and operates, and the elastic body 103 to vibrate the bowl 102 of the component transport device 1.

In this embodiment, when the switch 14 is turned on, a signal having a phase delay of π/2 with respect to the phase of the vibration signal V is supplied to the power amplifier 3.
Because the mounting direction is reversed, if the phase of the vibration signal V becomes opposite to the vibration phase of the component transport device 1 (in this case, turn on the power switch 15 and remove the component Even if a shock is applied to the transport device 1, no vibration occurs), and by simply turning on the switch 14, the output phase of the power amplifier 3 can be set to a lead phase of π/2 with respect to the vibration phase of the component transport device 1. can.

Further, since the phase shift circuit section 10 can lead its output phase to the phase of the vibration signal V in the range of O to π, the leading phase is set to π/2 as described above, and the component transport device 1 Not only can it be made to vibrate at its natural frequency ωO, but it can also be operated with the leading phase shifted from the natural frequency (900+α), and the necessary stability can be easily obtained. Moreover, this phase shift circuit section 10
Since this uses a delay element to extract a leading phase signal, it has the advantage of being more resistant to noise than when a differential type is used. Of course, the phase shifter 12 of the phase shift circuit section 10
may be composed of a single 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 basically necessary to 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 "," of the first-order delay element 13A (for example, using a semiconductor element or a combination of a semiconductor element and a resistor as the resistor r1) by the switch output thereof. 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 l can be stopped more quickly when the power switch 15 is opened by simply applying an external signal without opening the power switch 15. becomes possible.

In addition, although the switch 14 has been described as a manual switch,
For example, if a switching transistor is used and an element is provided to supply a base current to the transistor on the condition that there is no vibration signal (2) after a certain period of time has elapsed after the power switch 15 is turned on, the vibration detector 2 can be Even if the mounting direction is reversed, the output phase of the phase shift circuit section 10 can be corrected in a self-exciting manner.

〔Effect of the invention〕

As explained below, in this invention, the phase shift circuit section is composed of a first-order delay element and a phase inverter, and the phase inverter is configured to operate in a non-inverting manner by operating an external switch, thereby detecting vibrations. Even if the device is installed in the wrong direction, it can save you the trouble of reinstalling it or switching and connecting the power cables, and has the advantage of reducing fluctuations in the vibration phase due to noise. Since the delay characteristics of the first-order delay element are controlled by an external signal, vibration can be stopped without operating a power switch.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present 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 component transporting circuit diagram. It is a side view of the equipment. 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-・
Switch for output phase inversion.

Claims (2)

[Claims] (1) A vibration detector that detects the vibration of a vibrating device, a phase shift circuit that advances the phase of the output signal of the vibration detector, and amplifying the signal supplied from the transfer circuit to drive the vibration of the vibrating device. A self-excited resonant type vibrating device having a power amplifier that supplies power to a power amplifier, wherein the transfer circuit section includes a first-order delay element and a phase inverter, and has an external switch for output phase inversion. Vibration device. (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 amplifies the signal supplied from the transfer circuit to drive the vibration of the vibration equipment. A self-excited resonant vibrator having a power amplifier for supplying power to a power amplifier, which has an operation stop switch, and wherein the transfer circuit section includes a primary delay element with variable delay characteristics and a phase inverter, and 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.