CONCRETE VIBRATOR WITH IDLING MODE

Title:

CONCRETE VIBRATOR WITH IDLING MODE

Document Type and Number:

WIPO Patent Application WO/2019/207748

Kind Code:

A1

Abstract:

The objective of the present invention is to provide a concrete vibrator which is capable of automatically changing the rotational speed of a motor in accordance with the state of a vibrating cylinder, and which is capable of suitably avoiding an overheated state of the motor and failure resulting therefrom. This concrete vibrator is configured in such a way as to be operated under the control of a control means 8 in a normal mode in which driving power having a frequency capable of causing a motor 2 to rotate at a rotational speed suitable for a bubble removing operation is supplied to the motor 2, or in an idling mode in which driving power having a frequency capable of causing the motor 2 to rotate at a rotational speed lower than in the normal mode is supplied to the motor 2, wherein the control means 8 is configured in such a way that the operating mode is switched appropriately, by measuring the value of a current input into the control means 8 or the motor 2 at intervals of a unit of time and recording the same in a memory, comparing the most recent current value with a reference value calculated on the basis of a previous measured value, and recognizing the state of the vibrating cylinder by comparing the absolute value of the comparison value with a threshold.

Inventors:

SUZUKI SADAHISA (JP)
UEDA SHINJI (JP)
USHIJIMA HIROTAKA (JP)
YAMASHITA KAZUHIRO (JP)
SUZUKI MASAKI (JP)
ANDO TOMOKAZU (JP)

Application Number:

PCT/JP2018/017118

Publication Date:

October 31, 2019

Filing Date:

April 27, 2018

Export Citation:

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Assignee:

MIKASA SANGYO KK (JP)
TIETECH CO LTD (JP)

International Classes:

E04G21/08; H02P29/032

Foreign References:

JPH10252269A	1998-09-22
JP2004531384A	2004-10-14
JPS6073962A	1985-04-26
JP2014074297A	2014-04-24
JP2004137744A	2004-05-13
JPH10252269A	1998-09-22
JP2005348502A	2005-12-15
JP2007089284A	2007-04-05

Other References: