JPH02293603A - Abnormality detector for sliding part - Google Patents

Abstract

PURPOSE:To quantitatively detect the abrasion of sliding parts without being affected by temp., etc., by providing an abrasion loss measuring element laminated with many pieces of lead wires on the sliding surface of the sliding parts and converting the number of cut pieces of the lead wires to the abrasion loss. CONSTITUTION:The abrasion loss measuring element 3 laminated with many pieces of the lead wires 4 is embedded in a bearing 2 which is the sliding part to support a spindle 1 and is built in an abnormality detector 5. A power source 6 is connected to both terminals of the lead wires 4 and the lead wires 4 are successively scanned by a detecting means 7, by which the presence or absence of electrical conduction is detected. The result thereof is inputted to an abrasion change rate calculating means 8 and an abnormal abrasion loss detecting means 9. The output of the detecting means 9 is introduced to an abnormal abrasion loss change detecting means 10 by which the change rate of the abnormal abrasion loss is detected. The outputs of the detecting means 9, 10 are transmitted to an OR logical means 11. An abnormality alarm is emitted by an ANN alarming means 12 when the abnormality is decided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an abnormality detection device for sliding parts such as bearings and packings.

(Prior Art) Conventionally, to detect abnormalities in various sliding parts such as bearings, packings, etc., methods based on temperature monitoring and vibration monitoring of the sliding parts have been used.

In the temperature monitoring method, for example, a temperature sensor is inserted into a sliding portion, and seizure of the sliding portion is detected based on the temperature of the sliding portion detected by the temperature sensor. In addition, the vibration monitoring method detects foreign matter contamination and strong uneven contact using a vibration meter installed on the sliding part.

(Problems to be Solved by the Invention) The above-mentioned conventional technologies all indirectly monitor the sliding surfaces of sliding parts, and when detecting abnormal conditions, the temperature and vibration of the environment in which the sliding parts are installed are It is easily influenced by...
Moreover, there is a problem in that it is difficult to quantitatively understand the abnormal state of the sliding surface.

SUMMARY OF THE INVENTION An object of the present invention is to provide an abnormality detection device for a sliding part that can directly scan the condition of the sliding surface of a sliding part and quantitatively grasp an abnormal state of the sliding part.

[Structure of the invention]

(Means for Solving the Problem) In order to achieve the above object, the sliding part abnormality detection device of the present invention is provided by installing a large number of lead wires stacked in the radial direction near the sliding surface of the sliding part. a wear measurement element for detecting the wear state of the sliding parts; a wear calculation means for converting the number of cut lead wires of the wear measurement element into the wear amount; The present invention is characterized by comprising an alarm means for notifying the wear amount of the sliding parts, and a wear amount display means for displaying the amount of wear of the sliding parts.

(Function) According to the present invention configured as described above, the sliding part surface is
Scanned by the wear measurement element. This wear amount measuring element is an element in which a large number of lead wires are embedded in the vicinity of the sliding surface in a layered manner in the radial direction, and the number of disconnections is determined by sequentially scanning the presence or absence of continuity of each lead wire. is detected.

Wear fflM is calculated as follows: M−n−P ・・・・・・・・・・・・・・・・・・ When the number of cut lead wires of the wear measurement element is n1 and the radial pitch of the lead wires is P (pitch/piece).・・・・・・
It is calculated by a wear amount calculation means incorporating the calculation formula (1).

In addition, the time change rate Mt of the wear amount M is 1 step time (
If the amount of wear before scanning period is M' and the time for one step is ΔT, then Mt- (M-M')/ΔT... (2
) is calculated by the wear change rate detection means incorporating the calculation formula.

The amount of wear M and the time rate of change of the amount of wear Mt calculated by the above equations (1) and (2) are determined by the threshold value judgment in the abnormal wear amount detection means and the abnormal wear change detection means, respectively. It is quantitatively determined whether the part is abnormal or not.

If it is determined that the sliding part is abnormal by the OR logic means that takes the logical sum of the judgment results of the abnormal wear amount detection means and the abnormal wear change detection means, the ANN alarm means notifies the operator of the abnormality, and at the same time The wear amount of the sliding parts calculated by the calculation means is outputted by the wear amount display means.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a functional block diagram when the present invention is applied to abnormality detection of a bearing.

In the figure, a wear measurement element 3 is embedded in a bearing 2 that supports a main shaft 1. This wear amount lJj constant element is constructed by laminating a large number of lead wires 4 in the radial direction of the bearing 2, and is incorporated into the abnormality detection device 5.

A wear amount measuring element power supply 6 is connected between both ends of the lead wire 4 . The presence or absence of conduction of each lead wire 4 is detected by the wear amount detection means 7.

This wear amount detection means 7 sequentially scans each lead wire 4 to detect the presence or absence of continuity, and sends the results to a wear change rate calculation means 8.
, the abnormal wear amount detection means 9 is manually operated. The output of the abnormal wear amount detection means 9 is led to the abnormal wear change detection means 10 to detect the rate of change in the abnormal wear amount.

The outputs of the abnormal wear amount detection means 9 and the abnormal wear change detection means 10 are transmitted to the ANN alarm 12 through the OR logic means 11 to issue an alarm.

The output of the wear amount detection and calculation means 7 is input to a typewriter 13 used as a wear amount display means and printed, and is also stored in the memory 14. The stored contents are transmitted from the memory 14 to the wear amount detection calculation means 7, the wear change rate calculation means 8, the abnormal wear amount detection means 9, and the abnormal wear change detection means 10 as necessary.

In the abnormality detection means 5, the wear amount detection means 7, the wear rate change detection means 8, the abnormal wear amount detection means 9, the abnormal wear change detection means 10, the OR logic means 11, and the memory 14 are realized by an electronic computer. can do.

The sliding surface of the bearing 2 is scanned by the wear amount measuring element 3 to detect abnormalities.

Here, each lead wire 4 constituting the wear measurement element 3 is all conductive when the sliding surface of the bearing 2 is normal, but when an abnormality occurs on the sliding surface of the bearing 2, will break due to wear. Whether or not the lead wire is cut is detected by a wear detection means 7 having a scanning function.

The number n of lead wires to be cut is determined by the wear amount detection means 7,
It is converted into bearing wear ffiM using the above-mentioned equation (1).

Further, the bearing wear amount M is converted into a bearing wear change rate Mt by the wear change rate detection means 8 using the above-mentioned equation (2).

The bearing wear RM and the bearing wear change rate Mt calculated in this way are determined by threshold values in the abnormal wear amount detection means 9 and the abnormal wear change detection means 10, respectively.
It is determined quantitatively whether or not it is abnormal.

The final determination of abnormality is performed in the OR logic stage 11 that takes the logical sum of the determination results of the abnormal wear amount detection means 9 and the abnormal wear change detection means 10, but when it is determined that the bearing is abnormal, the ANN An alarm is issued by the alarm device 12, and at the same time, the operator can check the amount of bearing wear on the typewriter 13.

In addition, in order to specifically realize the above contents, memory 1
Equations (1) and (2) and the threshold values of the abnormal wear amount detection means 9 and the abnormal wear change detection means 10 are input in advance to 4, and the time series data of the bearing wear amount is used to calculate the wear amount. It is input from means 7 in real time.

According to this embodiment described above, since the bearing sliding surface is scanned through the 4-1 constant wear element in which the lead wires are stacked in the radial direction, abnormalities in the bearing can be detected without being affected by the bearing installation environment. can be detected quantitatively.

In the above embodiments, an example has been described in which an electronic computer is used to detect an abnormality in a bearing, but it is also possible to use an analog calculation device or a microcomputer instead of the electronic computer.

Furthermore, although an example has been described in which a bearing is selected as the target for abnormality detection, it goes without saying that the present invention is not limited to this and can be widely applied to various sliding parts.

FIG. 2 shows another embodiment of the present invention, in which the structure of the wear measurement unit 20 is the same as that in FIG. 1.

The conduction signal of each lead wire outputted from the wear amount measurement unit 20 is inputted via the addition means 21 to the bearing abnormality determination stage 22, which is the wear amount calculation means, and the wear amount display means 23, which consists of a typewriter or the like. Ru.

The bearing abnormality determination means 22 performs a threshold value determination based on the signal from the memory 7, and when it is determined that the bearing is abnormal, the AN
An alarm is issued by the N alarm means 12.

This embodiment also provides almost the same effects as the embodiment shown in FIG.

In each of the embodiments described above, a bearing is selected as the target for abnormality detection, but the present invention is not limited to this, and abnormality detection can be performed on a wide variety of sliding parts.

〔Effect of the invention〕

According to the present invention, since the sliding movement of the sliding part is scanned through the wear amount ΔIll constant element in which the lead wires are laminated in the radial direction, the sliding part is not affected by the environment in which the sliding part is installed.
Abnormalities in sliding parts can be detected directly and quantitatively.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing an example in which the present invention is applied to abnormality detection of a bearing, and FIG. 2 is a functional block diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Main shaft, 2... Bearing, 3... Wear amount measurement element, 4... Lead wire, 5... Abnormality detection device, 6...
Wear amount detection means, 7... Wear amount calculation means, 8... Wear change rate calculation means, 9... Abnormal wear amount detection means, 10
. . . Abnormal wear change detection means, 11. OR logic means, 12. ANN alarm, 13. Typewriter, 14. Memory, 20. Wear amount measurement unit, 21. ... Addition means, 22... Bearing abnormality determination means,
23... Wear amount display means.

Claims (1)

[Claims] A wear amount measurement element is installed near the sliding surface of a sliding part with multiple lead wires stacked in the radial direction to detect the wear state of the sliding part, and the number of lead wires cut by this wear amount measurement element. a wear amount calculating means for converting the amount of wear into an amount of wear, an alarm means for notifying an operator of an abnormality in the sliding part, and a wear amount display means for displaying the amount of wear of the sliding part. Abnormality detection device for moving parts.