JP3977953B2 - Earth auger machine power generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power generation device for an earth auger that rotationally drives an auger screw or the like by an electric motor.
[0002]
[Prior art]
As shown in FIG. 4, the electric earth auger includes a leader 2 erected on the base machine 1, and is engaged with a guide rail 3 attached to the leader 2 so that the auger driving device 5 can be lifted and lowered. The auger screw 6 is provided at the lower part of the auger drive device 5.
[0003]
An excavator is provided at the lower end of the auger screw 6, and the auger drive device 5 pushes the auger screw 6 into the ground while rotating it to form a hole having a diameter of the auger screw 6 in the ground.
The auger drive device 5 obtains electric power from a generator 8 mounted on the rear part of the base machine 1 through a control panel 10 to drive the electric motor, and transmits the electric motor to the auger screw 6 through a reduction gear. What can perform pole number conversion (for example, 4P and 8P) is used.
[0004]
As the generator 8, a portable general-purpose engine generator is generally used, and the voltage can be switched between 200V and 400V. During excavation, the engine is operated at a constant voltage and a constant frequency with a rated rotation.
Elements for controlling the electric motor of the auger drive device 5 are gathered in the control panel 10, and one example thereof is an ammeter terminal 11, an earth leakage breaker 12, a starting circuit 20, an open phase as shown in FIG. 2. A reverse phase detector 14, a forward / reverse switching device 15, a pole number switching device 16, and the like are arranged and placed on the roof of the base machine 1.
[0005]
Then, overcurrent, open phase and reverse phase protection of the electric motor 40 are protected, and selection of the rotation direction and selection of low speed and high speed by changing the number of poles are controlled. The starting circuit 13 is for starting a reduced voltage (soft start), and the voltage is lowered to about 80% of the rated voltage by a transformer 13a for a certain time (for example, 10 seconds).
[0006]
[Problems to be solved by the invention]
The generator 8 and the control panel 10 which are power supply devices to the electric motor 40 of the earth auger drive device 5 need to be mounted on the base machine 1, and the movement and turning operation of the base machine 1 are not impaired. It is necessary to make it as compact as possible. Further, when the earth auger machine is moved to the work site, it needs to be disassembled in order to be transported by a trailer, and each time, the control panel 10 is also removed and attached at the next work site. This attachment work includes wiring to the generator and the earth auger drive device 5, and a considerable amount of time is spent including the start-up inspection.
[0007]
The present invention has been developed in view of the above points, and provides a power generator for an earth auger machine that supplies power to an auger without providing a control panel and without increasing the size of the generator. It is intended to provide.
[0008]
[Means for Solving the Problems]
The present invention employs the following means to achieve the above object. That is,
In an earth auger generator that drives an auger screw with an electric motor, an open / reverse phase detector, forward / reverse switch and pole number switch are installed between the breaker in the casing of the generator and the output terminal board. It is characterized by having a resistor connected to the automatic voltage regulator and the voltage regulator, and a relay for short-circuiting the resistor for a predetermined time when the motor is started, between the automatic voltage regulator and the voltage regulator. Yes.
[0009]
The present invention is applied to a power generation device for an electric earth auger machine, and the earth auger machine is used for construction other than drilling such as ground improvement by attaching an agitation attachment instead of an auger screw. The same motor is used, and the present invention is naturally applicable.
[0010]
The present invention incorporates control devices previously stored in a control panel into a generator, eliminates the need for an external control panel, incorporates a control function into the generator, and achieves a compact device.
That is, the open / reverse phase detector, the forward / reverse rotation switch, and the pole number switch, which are motor control devices, were connected in series between the circuit breaker in the power generator and the output terminal board.
[0011]
Since these are not large devices, they can be sufficiently arranged near the operation panel provided on the side surface of the power generation device.
The starting circuit for starting the reduced voltage is provided with a resistor between the automatic voltage regulator and the voltage regulator, and the resistor is short-circuited for a predetermined time (for example, 10 seconds) when the motor is started. That is, a relay interlocking with the start switch of the electric motor is provided in parallel with the resistor, and the timer is returned after a predetermined time has elapsed. Therefore, this can be done with a small part without using a transformer as in the conventional starting circuit, so that it can be installed in the power generator.
[0012]
The ammeter and breaker provided in the generator can be used as the ammeter terminal and breaker provided in the control panel.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in the drawings.
As shown in FIG. 1, a brushless AC generator 20 is used in the power generator, and the armature coil is composed of two independent sets of an inner coil and an outer coil, and is connected between terminals by a voltage switching terminal plate 24. The generated voltage can be switched between a high voltage and a low voltage (for example, 400 V and 200 V). Also, the number of poles can be changed (4P and 8P). Reference numeral 21 denotes an automatic voltage regulator that acts to keep the terminal voltage generated with respect to load fluctuations constant. Reference numeral 30 denotes a voltage adjuster for setting a predetermined voltage. 23 is a circuit breaker for interrupting current when the load circuit is short-circuited or overloaded, 22 is an ammeter, 25 is a frequency meter, and 26 is a voltmeter. The above configuration is the same as that of a general-purpose power generator. is there.
[0014]
The following configuration is further added to this power generator.
Between the circuit breaker 23 and the output terminal board 35, an open / reverse phase detector 14, a forward / reverse switching device 15 and a pole number switching device 16 are connected in series. Further, a resistor 27 is provided between the automatic voltage regulator 21 and the voltage adjuster 30 and a relay 28 for short-circuiting the resistor 27 is provided. The relay 28 is linked to a start switch of the electric motor 40, and a timer is separately provided so as to operate for 10 seconds when the electric motor 40 is started. The resistor 27 has a capacity such that when the short circuit is short-circuited, the generated voltage of the generator is 80% of the rated value.
[0015]
Therefore, when the auger rotation switch is operated in the cab, the relay 28 is excited and the resistor 27 is short-circuited, so that the motor 40 is started with a voltage of 160 V (when set to 200 V). When 10 seconds elapse, the relay 28 is demagnetized by the timer, so that the automatic voltage regulator 21 is connected to the voltage adjuster 30 via the resistor 27, and the generated voltage is changed to 200V. As a result, the rotation of the electric motor 40 starts slowly when the auger screw is loaded, and a soft start can be performed.
[0016]
Since it is configured in this way, all the control devices conventionally provided in the control panel are provided in the power generation device, and a control panel for controlling the electric motor 40 is not required.
That is, the phase loss / reverse phase detector 14, the forward / reverse rotation switch 15 and the pole number switch 16 provided in the conventional control panel 10 are housed in the generator, and the starting circuit 13 is connected to the automatic voltage regulator 21 and the voltage. The function is replaced by the resistor 28 provided between the adjuster 30 and the relay 28 that short-circuits the resistor 27, and is deleted.
[0017]
The ammeter terminal 11 and the circuit breaker 12 provided in the control panel 10 can use the ammeter 22 and the circuit breaker 23 provided in the power generation apparatus.
[0018]
【The invention's effect】
As described above, the present invention provides an open / reverse phase detector, forward / reverse rotation switch and pole number switch connected in series between the circuit breaker in the casing of the power generator and the output terminal board. Between the automatic voltage regulator and the voltage regulator, a resistor for reducing the desired voltage at the time of a short circuit and a relay that short-circuits the resistor for a predetermined time at the start of the motor are provided. It is housed in the casing of the device and does not require a motor control panel.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a power generation device of an earth auger as an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a conventional power generation device for an earth auger.
FIG. 3 is a circuit diagram showing an example of a starting circuit 13 in FIG. 2;
FIG. 4 is a front view showing the entire earth auger machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base machine 2 ... Leader 3 ... Guide rail 5 ... Auger drive device 6 ... Screw auger 8 ... Generator 10 ... Control panel 11 ... Ammeter terminal 12 ... Earth leakage breaker 13 ... Start circuit 13a ... Transformer 14 ... Phase loss Reverse phase detector 15 ... Forward / reverse switching device 16 ... Pole number switching device 20 ... AC generator 21 ... Automatic voltage regulator 22 ... Ammeter 23 ... Circuit breaker 24 ... Voltage switching terminal board 25 ... Frequency meter 26 ... Voltmeter 27 ... Resistor 28 ... Relay 30 ... Voltage regulator 35 ... Output terminal board 40 ... Electric motor

Claims (1)

In an earth auger generator that drives an auger screw with an electric motor, an open / reverse phase detector, forward / reverse switch and pole number switch are installed between the breaker in the casing of the generator and the output terminal board. It is characterized in that a resistor is provided between the automatic voltage regulator and the voltage regulator, and a relay for short-circuiting the resistor for a predetermined time at the start of the motor is provided between the automatic voltage regulator and the voltage regulator. Earth auger machine power generator.

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