JP2017058293A - Bearing evaluation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bearing evaluation device capable of diagnosing the condition of a bearing such as a rolling bearing for use in a large-sized apparatus used at low speed rotation.SOLUTION: The bearing evaluation device is provided for evaluating a rolling bearing comprising: a first bearing ring at a rotary side; a second bearing ring at a fixed side; and a rolling element provided in a freely rollable manner between the first bearing ring and second bearing ring. The bearing evaluation device further comprises: a first detection device and a telemeter transmission part for receiving a detection signal of the first detection device, the first detection device and the telemeter transmission part being mounted on and integrally with the first bearing ring; a telemeter reception part for wirelessly receiving a signal from the telemeter transmission part; a telemeter reception part for wirelessly receiving the signal from the telemeter transmission part; a second detection part mounted on and integrally with the second bearing ring; and a signal processing part for comparing the detection signal from the first detection device received by an elementary reception part 2 with the detection signal from the second detection device, and making determination.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bearing evaluation apparatus for discriminating whether or not a bearing used in a large rotating machine such as a steel rolling apparatus or a wind power generator is damaged, and a damaged portion when the bearing is damaged.

  Conventionally, in a bearing used in a large apparatus such as a rolling mill for steel, for example, periodic disassembly visual inspection is performed in order to prevent the occurrence of inconvenience due to wear and breakage of bearing parts. In this visual disassembly inspection, the bearings are removed from the equipment after being used for a certain period of time and disassembled, and each bearing component is visually inspected by a trained professional inspector. Is to confirm. If abnormalities such as irregularities and wear that are not found in a new bearing are detected, assembly is performed again after replacement with a new bearing.

  However, the above-described overhaul inspection requires a lot of labor for the disassembly work for removing the bearing from the apparatus and the assembling work for reincorporating the inspected bearing into the apparatus, resulting in a significant increase in the maintenance cost of the apparatus. there were. In addition, there is a risk that the inspection itself may increase parts replacement by making a dent in the bearing parts or the like by mistake during disassembling work or assembling work at the time of inspection. Furthermore, depending on the level of proficiency of the person in charge of inspection, there is a risk that defects may be overlooked or inadequate, such as implementation of unnecessary parts replacement.

  Therefore, a bearing evaluation apparatus (for example, a patent document) that is widely used for abnormality diagnosis of small bearings and the like for the presence or absence of abnormality due to wear or damage of a bearing used in such a large apparatus, without performing the above-described disassembling visual inspection. 1) is being studied.

  FIG. 2 shows such a bearing evaluation apparatus 101 disclosed in Patent Document 1. In FIG. This bearing evaluation apparatus 101 converts the sound or vibration generated by the rolling bearing 103 into an electrical signal by the detection means 105 attached to the housing, converts this electrical signal into frequency spectrum data by waveform processing, and obtains the obtained spectrum. The presence / absence of abnormality of a specific part of the rolling bearing 103 is diagnosed depending on whether the data has a peak at a specific frequency component value caused by the abnormality of the rolling bearing 103.

  If such a bearing evaluation device can diagnose abnormalities of large bearings, periodic disassembly and assembly work of the bearings will be unnecessary, and the bearings may be accidentally damaged during inspection operations. Inconvenience can also be avoided. Further, the reliability of the inspection is not influenced by the skill level of the person in charge of the inspection, and it is possible to eliminate unnecessary parts replacement and to reduce the maintenance cost of the apparatus.

  In recent years, wind turbine bearings for wind power generation, which have been attracting attention as renewable energy, are often installed at high altitudes or offshore, and it is very difficult to disassemble or install the bearings. Since it takes time and effort, a bearing evaluation device that does not require disassembly of the bearing or the like is desired in order to avoid performing such work regularly.

  However, a bearing used in a large apparatus such as the windmill or the steel rolling mill described above is often used at a low speed of 20 rpm (one rotation for 3 seconds) or less. When used at such low speed rotation, specific frequency components output in accordance with the location of bearing damage come close to each other. For this reason, the obtained spectrum data has a peak in a specific frequency component value caused by the abnormality of the rolling bearing, but it is discriminated whether the place of occurrence of damage is an inner ring or an outer ring, for example. Can be difficult.

  As another conventional technique, in Patent Document 2, an acoustic signal generated from a rolling bearing of an extremely low speed rotating machine of 10 rpm or less is detected using a microphone having a sound collecting function, and a spectrum distribution is obtained by frequency analysis, There is disclosed a bearing evaluation apparatus that compares a spectral average value or effective value of a frequency obtained by processing with a reference value, and determines that a bearing is abnormal when the spectral average value or effective value exceeds the reference value. However, in the case of such a bearing evaluation apparatus, if an attempt is made to apply to a bearing surrounded by a housing, the sound signal is weaker than that when the bearing is exposed, so that the SN ratio is bad (the influence of noise is large). was there.

JP 2003-185535 A JP 2008-268187 A

  The present invention has been made in view of the above circumstances, and there is no need for disassembly of the apparatus, whether there is any abnormality such as wear or breakage of a rolling bearing such as a large bearing used at low speed rotation, and high reliability. It aims at providing the bearing evaluation apparatus which can be diagnosed by.

The above object of the present invention can be achieved by the following constitution.
A rotation-side first race ring, a fixed-side second race ring, and a rolling element provided between the first race ring and the second race ring so as to roll freely. A bearing evaluation device for a rolling bearing,
A first detection device and a telemeter transmitter for receiving a detection signal of the first detection device, which are integrally attached to the first track ring;
A telemeter receiver that wirelessly receives a signal from the telemeter transmitter;
A second detection device integrally attached to the second race ring;
A signal processing unit for comparing and comparing the detection signal from the first detection device received by the telemeter reception unit with the detection signal from the second detection device;
A bearing evaluation apparatus comprising:

  According to the bearing evaluation apparatus of the present invention, the detection signal from the first detection device integrally attached to the first raceway on the rotation side and the first attachment integrally attached to the second raceway on the fixed side. Since the detection signal from the detector 2 is compared and judged by the signal processing unit, if there is an abnormality in any of the races or rolling elements, accurate and reliable diagnosis without disassembling the rolling bearing It becomes possible to do.

It is explanatory drawing which shows schematic structure of one Embodiment of the bearing evaluation apparatus which concerns on this invention. It is a block diagram of the conventional evaluation apparatus.

  Hereinafter, a bearing evaluation apparatus according to the present invention will be described with reference to FIG.

  As shown in FIG. 1, the bearing evaluation device 1 includes a first detection device 11 and a telemeter transmitter 13 that are attached to a rotary shaft 21 that is integral with the first race ring 5 on the rotation side of the rolling bearing 3, and a telemeter. A telemeter receiver 15 that wirelessly receives a signal from the transmitter 13, a second detector 17 that is attached to a housing 23 that is integral with the stationary ring 7 on the rolling bearing 3, and a first detector 11. A signal processing unit 19 that compares the detection signal from the second detection device with the detection signal from the second detection device.

  In the case of this embodiment, the rolling bearing 3 is a rolling bearing for low-speed rotation used in a large apparatus such as a wind turbine main shaft or a steel rolling mill. The rolling bearing 3 is fixed to the rotating shaft 21 and is integrated with the rotating shaft 21, and is provided on the housing 23 of the apparatus and integrated with the housing 23. It has an outer ring 7 as a second raceway on the fixed side, and a rolling element 9 provided between the outer ring 7 and the inner ring 5 so as to be able to roll. Although not shown, a cage for holding the rolling elements 9 at substantially equal intervals in the circumferential direction may be provided as necessary.

  A first acceleration pickup 11 as a first detection device is attached to the rotating shaft 21. This attachment is performed by, for example, a magnet or an adhesive. The first acceleration pickup 11 detects a vibration value of the inner ring 5 generated on the rotating shaft 21 and converts it into an electric signal. For example, a piezoelectric detector can be used. The number of the first acceleration pickups 11 attached to the rotating shaft 21 may be one. However, as will be described later, in order to perform a more accurate evaluation, a plurality of the first acceleration pickups 11 are arranged at substantially equal intervals in the circumferential direction of the rotating shaft 21. It is preferable to be installed.

  As a vibration detection format, an appropriate format such as a jerk type, an acceleration type, a speed type, and a displacement type can be adopted. Further, in the present embodiment, the first acceleration pickup is attached to the rotating shaft integral with the inner ring, but may be directly attached to the inner ring 5 when the bearing size is large, such as a windmill bearing. Furthermore, as a detector for detecting vibrations, it is also possible to use an AE sensor, an ultrasonic sensor, a shock pulse sensor, a microphone, or the like that can convert a physical quantity generated due to vibration of a rolling bearing into an electrical signal. I can do it.

  The telemeter transmission unit 13 is attached to the rotary shaft 21 by, for example, being secured by a magnet, an adhesive, or a belt. The telemeter transmission unit 13 and the first acceleration pickup 11 described above are electrically connected to each other by a cable, and the telemeter transmission unit 13 directly receives an electrical signal generated from the first acceleration pickup 11.

  The telemeter receiving unit 15 is attached to the housing 23. The telemeter receiving unit 15 receives an electrical signal transmitted wirelessly from the telemeter transmitting unit 13 described above. In order to make such wireless transmission / reception highly reliable, the telemeter receiving unit 15 is preferably arranged as close as possible to the telemeter transmitting unit 13.

  A second acceleration pickup 17 as a second detection device is attached to the housing 23. This attachment is also performed by, for example, a magnet or an adhesive, but may be embedded in an attachment hole formed in the housing. The second acceleration pickup 17 detects a vibration value of the outer ring 7 generated in the housing 23 and converts it into an electric signal. A detector of the same type as the first acceleration pickup 11 described above can be used. .

  Although the number of the second acceleration pickups 17 attached to the housing 23 may be one, as will be described later, in order to perform a more accurate evaluation, a position concentrically with the outer ring 7 on the outer diameter side of the outer ring 7. It is preferable that a plurality of them are installed at substantially equal intervals in the circumferential direction. Note that the second acceleration pickup 17 may also be directly attached to the outer ring 7 when the bearing size is large.

  The signal processing unit 19 compares and determines the detection signal from the first acceleration pickup 11 received by the telemeter receiving unit 15 and the detection signal from the second acceleration pickup 17, and evaluates the state of the rolling bearing 3.

  Subsequently, the determination diagnosis of the measurement data in the signal processing unit 19 will be described.

  This determination is based on the principle that if there is a damaged part, the vibration value from the damaged part is different from the vibration value from the non-damaged part, the vibration values of the first acceleration pickup 11 and the second acceleration pickup 17 are determined. By comparing each other. Further, as described above, when the first acceleration pickup 11 and the second acceleration pickup 17 are arranged at substantially equal intervals in the circumferential direction, the vibration values of the plurality of acceleration pickups are compared with each other, thereby causing damage. The phase of the part can be accurately determined.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. For example, it is possible to determine the phase position of damage if there is damage by attaching a combination of an acceleration pickup and an encoder to the first track ring on the rotation side.

DESCRIPTION OF SYMBOLS 1 Bearing evaluation apparatus 3 Rolling bearing 5 Inner ring 7 Outer ring 9 Rolling body 11 First acceleration pickup 13 Telemeter transmission unit 15 Telemeter reception unit 17 Second acceleration pickup 19 Signal processing unit

Claims (1)

A rotation-side first race ring, a fixed-side second race ring, and a rolling element provided between the first race ring and the second race ring so as to roll freely. A bearing evaluation device for a rolling bearing,
A first detection device and a telemeter transmitter for receiving a detection signal of the first detection device, which are integrally attached to the first track ring;
A telemeter receiver that wirelessly receives a signal from the telemeter transmitter;
A second detection device integrally attached to the second race ring;
A signal processing unit for comparing and comparing the detection signal from the first detection device received by the telemeter reception unit with the detection signal from the second detection device;
A bearing evaluation apparatus comprising:

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