JP3954730B2 - Vibrating article supply device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibratory article supply apparatus, and in particular, aligns and conveys articles by driving a vibrating body with a variable frequency variable voltage power supply device (hereinafter referred to as an inverter type frequency variable controller) to apply vibration to the articles. The present invention relates to a vibratory article supply apparatus that supplies the same.
[0002]
[Prior art]
FIG. 5 is a diagram showing a concept of a conventional vibration article supply apparatus. In FIG. 5, the vibratory article supply apparatus includes a bowl 1, a lower vibrator 2, an electromagnet 3 attached to the lower vibrator 2, an upper vibrator 4 attached to the lower side of the bowl 1, and the bowl 1. And a plate spring 5 connecting the lower vibrating body 2, a suction iron plate 7 provided so as to face the electromagnet 3, and a controller 6. The bowl 1 accommodates articles inside thereof and aligns and supplies parts along a spiral track formed on the inner peripheral surface thereof. The attracting iron piece 7 attached to the upper vibrating body 4 intermittently supplies a drive current (excitation current) to the electromagnet 3, thereby generating a magnetic attraction force intermittently generated between both members and a restoring force of the leaf spring 5. The bowl 1 is vibrated by the interaction. The controller 6 controls the drive current.
[0003]
In such a vibration-type article supply device, in order to supply articles efficiently, the frequency of the drive current is set so that the natural frequency of the bowl 1 and the frequency at which the drive current flows intermittently resonate. A variable frequency inverter type frequency controller is built in the controller 6. The inverter type frequency variable controller rectifies and smoothes an external AC voltage into a DC voltage, and converts the DC voltage into an AC voltage having an arbitrary frequency.
[0004]
[Problems to be solved by the invention]
If the inverter-type variable frequency controller of the above-described vibration-type article supply device is used, resonance can be adjusted accurately and easily, so that the adjustment work of the leaf spring 5 which is troublesome and labor-intensive is unnecessary. For this reason, (1) there is no problem even if it is moved to an area with a different frequency. (2) When changing the setup, it can be operated by switching the frequency even if it is placed on the bowl 1 of different size and weight. ▼ Many problems of the vibratory article supply device can be solved, such as being able to quickly cope with changes over time such as the sag of the leaf spring 5.
[0005]
However, the inverter type frequency variable controller has various problems as will be described later, and so far only a small capacity controller has been put to practical use. Recently, due to the ease of use of the inverter-type variable frequency controller as described above, there is an increasing demand for using such a controller for a large-sized vibration-type article supply apparatus. In particular, in a large model, the replacement and adjustment of the leaf spring 5 requires a long time, so the needs are very high.
[0006]
However, in order to realize an inverter type frequency controller capable of driving a large vibration article supply device, there are the following problems.
[0007]
First, it is necessary to flow a large current through an electromagnet as a vibrating body for driving the large bowl 1, and it is necessary to use a large capacity power transistor in the output stage. However, a large amount of current flows through the power transistor, and heat generation is large. Unless the heat dissipation effect of the housing in which the inverter frequency variable controller is housed is increased, each (electronic) element of the inverter frequency variable controller is exposed to heat. If the constant is changed, the output frequency is changed, the efficiency of the article supply is lowered, and the supply operation may be unstable. In other words, there is a possibility that the supply speed of the article is lowered, or that the attitude selection is erroneously caused. In the worst case, each (electronic) element may be damaged or shorten its life.
[0008]
On the other hand, in order to increase the heat dissipation effect, there is a method of enlarging the housing, but it is desirable that the supply device is small and inexpensive. Furthermore, it is desirable that the size of the control device that is not directly involved in the article supply is particularly small.
[0009]
Therefore, a main object of the present invention is to provide a vibratory article supply apparatus that can supply a large article efficiently and stably even if a small and inexpensive inverter-type variable frequency controller is used.
[0010]
[Means for Solving the Problems]
A vibratory article supply apparatus according to the present invention is a vibratory article supply apparatus that supplies articles by aligning and conveying articles by applying vibrations to the articles by a vibrator, and includes a control unit provided outside the main body, control unit includes a housing, is accommodated in a housing is driven by an external power supply, generates a desired AC voltage of a frequency to drive the vibratory article feeder, in response to a stop instruction signal AC An inverter type frequency variable controller that stops voltage generation, a heat sink for dissipating the heat generating part of the inverter type frequency variable controller, and a DC power supply voltage that are driven to rotate. a cooling fan for cooling the heat sink housing, noise cooling fan is generated in the DC power supply voltage by being driven to rotate Including a waveform shaping circuit for generating a reset signal and waveform-shaped, is reset each time a reset signal is generated, and a timer for outputting a stop instruction signal in response to a lapse of a predetermined time after being reset.
[0011]
Preferably, the cooling fan is disposed at the upper part or the lower part of the heat sink.
[0012]
Preferably , the control unit includes notification means for notifying that the rotational driving of the cooling fan has stopped in response to the output of the stop instruction signal from the timer .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an external perspective view of a controller according to an embodiment of the present invention, and FIG. 2 is a side sectional view of the controller.
[0014]
1 and 2, the housing 10 is divided into a cover 11 and a panel 12. A heat sink 13 is attached to the back of the panel 12, and a power transistor 14 is attached to the heat sink 13. The control board 15 is attached at a position away from the heat sink 13 so as not to be affected by heat. As shown in FIG. 2, electronic components constituting the inverter type variable frequency controller 20 are attached to the control board 15. A cooling fan 16 for cooling the heat sink 13 is attached to one side of the cover 11, and a slit 17 for releasing air from the cooling fan 16 is formed on the opposite side.
[0015]
The cooling fan 16 may be a suction type or a blow type, and the heat sink 13 is cooled by the rotation of the fan. On the cover 11, an indicator 18 made of, for example, an LED is attached in order to notify that the rotation of the cooling fan 16 has stopped for some reason.
[0016]
FIG. 3 is a diagram showing a fan stop detection circuit that detects that the cooling fan 16 shown in FIGS. 1 and 2 has stopped. In FIG. 3, a DC voltage is supplied from the DC power source 21 to the timer 22 and the cooling fan 16. A rotation pulse is supplied from the cooling fan 16 to the timer 22 as a reset signal. The timer 22 continues to be reset every time the reset signal is given, and the relay coil 23 is driven after a certain period of time has passed since the rotation of the cooling fan 16 stops and the reset signal is no longer given. close. The relay contact 24 is connected in series with a current limiting resistor 26 and an indicator 18 composed of an LED for informing that the cooling fan 16 has stopped rotating. Accordingly, the indicator 18 lights up when the cooling fan 16 stops rotating and the relay contact 25 is closed. When the relay contact 25 is closed, the operation of the inverter type frequency variable controller is stopped.
[0017]
FIG. 4 is a diagram showing an example of resetting the timer 22 when no rotation pulse is output from the cooling fan 16 in the embodiment shown in FIG. In FIG. 4, a positive voltage is supplied from the DC power supply 21 to the motor of the cooling fan 16 through the diode 27. Normally, when the motor is rotating, noise due to switching of the rotating magnetic field returns to the power supply side. Therefore, this noise is picked up through the capacitor 29, shaped into a pulse signal by the waveform shaping circuit 28, and the reset signal shown in FIG. Is provided to the timer 22. When the rotation of the cooling fan 16 stops for some reason, the rotating magnetic field is not switched, so that no noise is generated and no reset signal is obtained. Therefore, the timer 22 drives the relay coil 23 after a predetermined time has elapsed. The diode 27 is for preventing the noise from being absorbed by the DC power source 21 and may be omitted.
[0018]
As described above, according to this embodiment, as shown in FIG. 1, the inverter type variable frequency controller board 15 is arranged on the panel 12 of the housing 10, and the heat sink 13 to which the power transistor 14 with large heat generation is attached is provided. By disposing the air under the substrate 15 and forcibly sending air into the heat sink 13 by the cooling fan 16, the heat dissipation effect can be enhanced. Moreover, since the cover 11 has the effect | action which guides the air which the cooling fan 16 sent in efficiently to the heat sink 13 as shown in FIG. 2, the heat dissipation effect can be improved further. At the same time, the cover 11 also has an effect of preventing an operator from touching the heat sink 13 directly even when the heat sink 13 becomes hot.
[0019]
When the cooling fan 16 breaks down, the display 18 is turned on and the operation of the inverter type frequency variable controller is stopped, thereby eliminating the possibility that the power transistor is thermally runaway due to heat generation. It is possible to prevent power supply to the article supply apparatus from becoming unstable.
[0020]
【The invention's effect】
As described above, according to the present invention, the heat generating portion of the inverter type frequency variable controller is radiated by the heat sink, and the heat sink is forcibly cooled by the cooling fan, so that the heat radiating effect can be enhanced. Therefore, the electronic components constituting the inverter type variable frequency controller are not exposed to high heat, so that damage to the electronic components can be reduced and the life can be extended. Furthermore, the frequency fluctuation of the inverter type frequency variable controller can be prevented, and there is no possibility that the supply efficiency of parts will be reduced or the supply operation will become unstable.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an embodiment of the present invention.
FIG. 2 is a side sectional view of the housing shown in FIG.
FIG. 3 is a diagram showing a fan stop detection circuit that detects that the cooling fan shown in FIG. 1 has stopped.
FIG. 4 is a diagram illustrating an example in which a timer is reset when a rotation pulse is not output from a cooling fan.
FIG. 5 is a diagram showing a concept of a conventional vibration article supply apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Case 11 Cover 12 Panel 13 Heat sink 14 Power transistor 15 Board | substrate 16 Cooling fan 17 Slit 18 Display 20 Inverter type variable frequency controller 21 DC power supply 22 Timer 23 Relay coil 24, 25 Relay contact 26 Current limiting resistor 27 Diode 28 Waveform shaping Circuit 29 Capacitor

Claims (3)

A vibration-type article supply device that supplies an article by aligning, conveying and supplying the article with vibration by a vibrating body,
Provided with a control unit provided outside the main body,
The controller is
A housing,
The housing is accommodated in the body is driven by an external power supply, generates a desired AC voltage of a frequency for driving the vibratory article feeder, stop the generation of the AC voltage in response to the stop instruction signal An inverter-type variable frequency controller
A heat sink for dissipating the heat generating part of the inverter frequency variable controller, disposed on the back surface of the inverter frequency variable controller in the housing;
A cooling fan that is driven to rotate by a DC power supply voltage and cools the heat sink in the housing ;
A waveform shaping circuit for shaping a noise generated in the DC power supply voltage by rotating the cooling fan to generate a reset signal;
And a timer that outputs the stop instruction signal when a predetermined time has elapsed since the reset signal was generated .   The vibratory article supply apparatus according to claim 1, wherein the cooling fan is disposed at an upper part or a lower part of the heat sink. The said control part contains the alerting | reporting means which alert | reports that the rotational drive of the said cooling fan stopped according to the said stop instruction | indication signal being output from the said timer , The Claim 1 or Claim characterized by the above-mentioned. 2. The vibratory article supply apparatus according to 2.

Images