Status monitoring system and status monitoring method for rolling device

Patent metadata

Field	Value
Publication number	US-9335317-B2
Application number	US-201214002878-A
Country	US
Kind code	B2
Filing date	Feb 24, 2012
Priority date	Mar 3, 2011
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A status monitoring system for accurately determining the contaminant water concentration in a lubricant oil used in a rolling device includes a contaminant water concentration monitoring device configured to monitor the contaminant water concentration in the lubricant oil. The contaminant water concentration monitoring device includes an electrostatic capacitance detector and an oil temperature measuring instrument, which are configured to detect the electrostatic capacitance and the oil temperature of the lubricant oil, respectively, and a water concentration calculation section configured to calculate the contaminant water concentration from the detected electrostatic capacitance and oil temperature in accordance with a predetermined rule.

First claim

What is claimed is:

1. A status monitoring system to monitor a status of a rolling device, comprising:
a contaminant water concentration monitoring device to monitor a contaminant water concentration in a lubricant oil, the contaminant water concentration monitoring device including:
an electrostatic capacitance detector to detect an electrostatic capacitance in the lubricant oil;
an oil temperature measuring instrument to detect an oil temperature in the lubricant oil;
a water concentration calculation section to calculate the contaminant water concentration in accordance with a predetermined rule from the electrostatic capacitance detected by the electrostatic capacitance detector and the oil temperature detected by the oil temperature measuring instrument;
a lubricant oil reservoir formed as a portion of a housing of the rolling device and capable of performing an oil bath lubrication; and
a measurement chamber for measurement of the electrostatic capacitance and the oil temperature inside or outside of the housing,
wherein the electrostatic capacitance detector and the oil temperature measuring instrument are provided within the measurement chamber, and
the measurement chamber is formed with partitions in the case where the measurement chamber is provided inside the housing.

2. The status monitoring system for the rolling device as claimed in claim 1 , further comprising a circulating oiling mechanism capable of performing a circulating oiling.

3. The status monitoring system for the rolling device as claimed in claim 1 , further comprising a stirrer to stir the lubricant oil within the measurement chamber for measurement of the electrostatic capacitance and the oil temperature.

4. The status monitoring system for the rolling device as claimed in claim 3 , further comprising a mechanism to facilitate a discharge of water or an additive, having a specific gravity higher than that of the lubricant oil, from the measurement chamber for measurement of the electrostatic capacitance and the oil temperature and from the rolling device.

5. The status monitoring system for the rolling device as claimed in claim 1 , further comprising an abnormality diagnostic section to compare the contaminant water concentration, calculated by the water concentration calculation section, with a threshold value and to determine an occurrence of an abnormality in the event that the contaminant water concentration is higher than the threshold value.

6. An abnormality diagnostic threshold value setting method for a status monitoring system of a rolling device as described in claim 5 for determining the threshold value for the abnormality diagnostic section, comprising:
determining a threshold value for the contaminant water concentration through a rolling slide fatigue test in which water is injected into the lubricant oil, the contaminant water concentration is monitored by measuring the electrostatic capacitance and the oil temperature, and feeding the measured contaminant water concentration back so as to control the amount of water injected so that the contaminant water concentration is maintained within a constant range; and
setting the threshold value so determined to the abnormality diagnostic section as a threshold value.

7. An abnormality diagnostic threshold value setting method for a status monitoring system of a rolling device as described in claim 5 for determining the threshold value for the abnormality diagnostic section, comprising:
determining a threshold value for the contaminant water concentration through a rolling slide fatigue life test in which a slide is caused in a contact surface by a motion mechanism between elements that contact with each other; and
setting the threshold value so determined to the abnormality diagnostic section as a threshold value.

8. An abnormality diagnostic threshold value setting method for a status monitoring system of a rolling device as described in claim 5 for determining the threshold value for the abnormality diagnostic section, comprising:
determining a threshold value for the contaminant water concentration through a rolling slide fatigue life test in which a slide is forcibly caused in a contact surface between elements that contact with each other; and
setting the threshold value so determined to the abnormality diagnostic section as a threshold value.

9. An abnormality diagnostic threshold value setting method for a status monitoring system of a rolling device as described in claim 5 for determining the threshold value for the abnormality diagnostic section, comprising:
determining a threshold value for the contaminant water concentration through a rolling slide fatigue life test in which one direction rotation at a constant rotational speed is continued until occurrence of a damage; and
setting the threshold value so determined to the abnormality diagnostic section as a threshold value.

10. An abnormality diagnostic threshold value setting method for a status monitoring system of a rolling device as described in claim 5 for determining the threshold value for the abnormality diagnostic section, comprising:
determining a threshold value for the contaminant water concentration through a rolling slide fatigue life test in which acceleration and deceleration operation is continued until occurrence of a damage; and
setting the threshold value so determined to the abnormality diagnostic section as a threshold value.

11. An abnormality diagnostic threshold value setting method for a status monitoring system of a rolling device as described in claim 5 for determining the threshold value for the abnormality diagnostic section, comprising:
determining a threshold value for the contaminant water concentration through a rolling slide fatigue life test in which rocking motion is continued until occurrence of a damage; and
setting the threshold value so determined to the abnormality diagnostic section as a threshold value.

12. An abnormality diagnostic threshold value setting method for a status monitoring system of a rolling device as described in claim 5 for determining the threshold value for the abnormality diagnostic section, comprising:
determining a threshold value for the contaminant water concentration through a rolling slide fatigue life test in which a mechanism to directly connect a main shaft of a servo motor and a spindle of a testing portion is used in order to eliminate an overlapping vibration component so that a damage in rocking motion may be accurately detected with a vibration; and
setting the threshold value so determined to the abnormality diagnostic section as a threshold value.

13. An abnormality diagnostic threshold value setting method for a status monitoring system of a rolling device as described in claim 5 for determining the threshold value for the abnormality diagnostic section, comprising:
determining a threshold value for the contaminant water concentration through a rolling slide fatigue life test in which a motor and a spindle of a testing portion are insulated with the use of a rolling element made of a ceramic material for a support bearing assembly for the spindle in order to facilitate an abrasion of an object to be damaged by supplying an electric current between contact elements with the to-be-damaged object being on a positive pole side, and
setting the threshold value so determined to the abnormality diagnostic section as a threshold value.

14. An abnormality diagnostic threshold value setting method for a status monitoring system of a rolling device as described in claim 5 for determining the threshold value for the abnormality diagno

Assignees

• Matsubara Yukio
• Miwa Noriaki
• Kitagawa Takakazu
• Sakaguchi Tomoya
• Kawakita Masayuki
• Maeda Hisamitsu
• Ntn Toyo Bearing Co Ltd

Inventors

• Matsubara Yukio
• Miwa Noriaki
• Kitagawa Takakazu
• Sakaguchi Tomoya
• Kawakita Masayuki
• Maeda Hisamitsu

Classifications

• G01N33/2888 Primary

  Lubricating oil characteristics, e.g. deterioration (lubricating properties G01N33/30) · CPC title

• G01M13/04

  Bearings · CPC title

• F16C19/52

  with devices affected by abnormal or undesired conditions · CPC title

• G01N27/221

  by investigating the dielectric properties (using microwaves G01N22/00; measuring loss factors or dielectric constants per se G01R27/26) · CPC title

• F16C33/667

  related to conditioning, e.g. cooling, filtering · CPC title