JP2528607Y2 - Remote control device of inverter for concrete vibrator. - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control device for an inverter for a concrete vibrator used for controlling the vibration frequency of a concrete vibrator used for placing concrete.

[0002]

2. Description of the Related Art Remote control of a concrete vibrator for shaking a formwork in a secondary concrete product manufacturing plant or a rod-shaped concrete vibrator used in a construction site is desired. And
Some control devices for enabling remote control have also been proposed. All of these conventionally proposed remote control devices utilize pulse-based signal conversion such as the PCM method.

[0003]

However, in an apparatus utilizing signal conversion by a pulse, a dedicated radio transceiver for signal transmission has been required. For this reason, the apparatus is inevitably complicated and expensive, and practical use is difficult. Therefore, a small and inexpensive apparatus has been desired. This idea is
It is an object of the present invention to provide a remote control device that controls a vibration frequency of a vibrator and a drive source according to a change in a concrete placing amount, a slump value, and the like by using a small and inexpensive device without using a pulse signal. .

[0004]

The remote control apparatus for an inverter for a concrete vibrator according to the present invention controls the inverter by using a low frequency signal and a voice transceiver without using a pulse signal. It is a solution to the above problem.

[0005] The control device of the present invention is composed of a transmission unit and a reception unit in the same manner as the conventional device. The transmission unit is a control command switch, a low frequency generation circuit that outputs a plurality of low frequency signals corresponding to a plurality of commands instructed by the switch, and a wireless radio transmitter for audio that inputs the low frequency signal and wirelessly outputs the signal. And The low-frequency signal is composed of a combination of a plurality of low-frequency signals that is smaller in number than the control command switch. Further, the receiving unit is a low-frequency radio receiver for receiving a signal from the low-frequency audio transmitter, and a low-frequency signal for separating a low-frequency combination constituting a low-frequency signal output from the low-frequency signal for audio. It has a signal classification circuit and a control circuit for controlling the inverter with an output signal corresponding to the combination of the low frequencies output from the low frequency signal classification circuit.

The low-frequency transmission circuit includes a plurality of low-frequency signals corresponding to the number of switches by combining a plurality of low-frequency signals, the number of which is smaller than the number of control command switches (excluding zero frequency).
Is output. The control circuit may control only the output frequency of the inverter, but preferably also controls the power supply.

In this invention, when a switch is operated to instruct control corresponding to a desired frequency of the vibrator,
A plurality of low frequencies are output from the low frequency transmission circuit, and a low frequency signal in which these are combined (combined) is wirelessly output from the wireless transmitter for voice transmission. The wirelessly output signal is input to the audio transmission wireless receiver of the receiving unit, and is input to the low frequency classification circuit. The low-frequency classification circuit classifies low-frequency combinations forming the input signal and outputs a control signal corresponding to the low-frequency combinations to the control circuit. The control circuit outputs a control signal of the inverter frequency or a load start / stop signal for controlling the power supply to the inverter, and the inverter or the drive power supply is controlled. Here, since the command is transmitted using the low frequency signal, a dedicated transceiver is not required, and an inexpensive transceiver for voice transmission can be used.

[0008]

FIG. 1 is a block diagram of a transmitting unit. Reference numerals 1, 2, 3, 4, 5, and 6 denote switches provided outside a casing of the transmitting unit. And an audio wireless transmitter 8 are arranged.
The switches 1 to 4 are for commanding the output frequency of the inverter to control the frequency and amplitude of a concrete vibrator (not shown),
The switches 5 and 6 are for instructing ON / OFF of the load start / stop control circuit to control the drive power supply.

The low frequency transmitting circuit 7 has four types (for example, 1 type).
000Hz, 2000Hz, 3000Hz, 4000H
z), and has four low-frequency transmission units,
6 corresponding to the above 6 switches by combining
Various kinds of low frequency signals are obtained. Note that which combination of frequencies is output to which switch is determined in advance. The audio wireless transmitter 8 wirelessly outputs the output signal of the low frequency transmission circuit 7. Since it is for transmitting low-frequency signals, a dedicated structure is unnecessary and a general-purpose audio radio transmitter can be used as it is.

FIG. 2 is a block diagram of the receiving unit.
An audio radio receiver 9 for receiving a signal wirelessly output from the audio radio transmitter 8, a low-frequency signal classification circuit 10,
An inverter frequency control circuit 11 and a load start / stop control circuit 12 are provided.
Connected to

The low-frequency signal discriminating circuit 10 is composed of filters corresponding to the four frequencies transmitted by the low-frequency transmitting section of the low-frequency transmitting circuit 7, and the frequencies constituting the input low-frequency signal. Are sorted out. Then, a control signal is output to a predetermined port in accordance with the result of combining the separated frequencies, and the signal is input to the inverter frequency control circuit 11 or the load start control circuit 12. The inverter frequency control circuit 11 outputs an electric signal of a target frequency to the inverter 13 in order to operate the vibrator at a frequency corresponding to the control signal. Further, the load start control circuit 12 outputs an ON-OFF signal of the drive power supply to the inverter 13 in response to the control signal.

In the above embodiment, a plurality of switches 1
6 are provided to transmit six types of low-frequency signals, but the number of switches and the type of low-frequency signals can be arbitrarily changed according to the control level. Also, the switches can be microcomputer controlled. Further, the transmission frequency may be changed by one switch using a rotary or slide switch.

When only controlling the vibration frequency of the vibrator is sufficient, the load start / stop control circuit 12 is unnecessary.

In the above embodiment, an example in which one transmission unit controls one inverter is shown.
It is also possible to control a plurality of inverters with one transmission unit. That is, a switch for generating an inverter instruction signal is added to the switch of the transmission unit, and the inverter instruction signal is also output from the low frequency transmission circuit 7 as a low frequency signal. Is determined, and the signal is output only to the control circuit of the corresponding inverter. Such a configuration is also included in the technical scope of the present invention.

[0015]

According to the invention, since the inverter of the vibrator is remotely controlled by a low-frequency signal, a general-purpose audio radio transceiver is used as the transceiver for transmitting a signal from the transmission unit to the reception unit. can do. Since the radio transceiver for voice has a small and inexpensive circuit configuration, the cost of the entire apparatus can be reduced. The function of the device is the same as that of the expensive pulse type, and the radio control of the concrete vibrator is possible, making it easy for operators to handle. Workability is improved.

Further, in the present invention, a low frequency signal is formed and controlled by a combination of low frequencies.
A control function exceeding the number of low frequencies can be obtained by the same number of filter circuits as the number of low frequencies, and the circuit configuration of both the transmission unit and the reception unit can be simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram of a transmission unit of the present invention.

FIG. 2 is a block diagram of the receiving unit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 switch 2 switch 3 switch 4 switch 5 switch 6 switch 7 low frequency transmission circuit 8 audio radio transmitter 9 audio radio receiver 10 low frequency signal separation circuit 11 inverter frequency control circuit 12 load start / stop control circuit 13 inverter

Claims (2)

(57) [Scope of request for utility model registration] A transmission unit configured to output a plurality of low-frequency signals corresponding to a plurality of commands instructed by the switch; A wireless transmitter for voice that inputs the low-frequency signal and wirelessly outputs the low-frequency signal, wherein the low-frequency signal is configured by a combination of a plurality of low-frequency signals whose number is smaller than that of the control command switch; An audio radio receiver for receiving a signal from the audio radio transmitter; a low frequency signal discriminating circuit for discriminating a combination of low frequencies constituting a low frequency signal output from the audio radio receiver; A control circuit for controlling the inverter with an output signal corresponding to the combination of the low frequencies output from the signal classification circuit, the remote control device for an inverter for a concrete vibrator. Place 2. The remote control device for an inverter for a concrete vibrator according to claim 1, wherein the control circuit controls an output frequency and a power supply of the inverter.