JPH06193629A - Bearing abrasion loss detecting device - Google Patents

Abstract

PURPOSE:To provide a bearing abrasion loss detecting device capable of directly and accurately detecting abrasion loss of a bearing, being attached easily and having high reliability. CONSTITUTION:Thin film resistive bodies 12 having a fixed value of resistivity are laminated in an insulator 14 at a fixed diestance L, and both ends of respective thin film resistive bodies 12 are but in parallel connection by a connecting wire 13 and formed in an abrasion sensor 11. This abrasion sensor 11 is implanted in a bearing 1 so as to be worn together with a metal 3, and abrasion amount of the metal 3 is calulated and displayed by means of a calculation display means 17 by correcting the value of resistivity which follow as tempreature change by meanus of the resistance change and a temperature detected value of a temperature sensor 16. The abrasion amount can be easily and accurately detected only by implanting the absrasion sensor 11 in the bearing 1, thereby the time for exchanging the metal 3 of the bearing 1 can be knows by always monitoring the bearing abrasion amocnt, so that the generation of any trouble can be prevented in advance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing wear amount detecting device for detecting the amount of wear of a sliding bearing of a rotary machine, and uses a wear sensor which wears with the wear of the bearing and changes its electric resistance. The amount of wear can be detected.

[0002]

2. Description of the Related Art In rotary machines such as internal combustion engines, pumps and blowers, sliding bearings are often used as bearings for rotatably supporting the rotary shafts thereof, and smooth rotation is maintained by supplying lubricating oil or the like. However, if the metal of the slide bearing wears over the operating time, the rotating shaft may vibrate or, in the worst case,
It may be impossible to drive.

For this reason, the wear of the bearing has been monitored, but conventionally, there is no method for directly detecting the wear of the bearing. Instead, the displacement of the rotating shaft is detected to estimate the wear amount. For example, the displacement of the rotating shaft is detected by a capacitance type sensor, or the displacement of the rotating shaft is detected by using a gap sensor, etc., and if the displacement amount increases, it is determined that there is an abnormality in the slide bearing. I am trying to do it.

As another method of monitoring the state of the bearing, the temperature of the plain bearing is monitored by a temperature sensor, and when the temperature becomes high, it is determined that an abnormality has occurred. .

[0005]

However, in the case where the wear amount of the bearing is estimated from the displacement of the rotating shaft by the capacitance type or the gap sensor, even if the wear amount of the metal of the slide bearing is increased. Depending on the lubrication condition and the load condition of the rotary shaft, the rotary shaft may rotate stably in the bearing metal, and there is a problem that an error easily occurs with the wear amount of the bearing metal. The same problem arises when estimating the amount of metal wear from the abnormal bearing temperature due to.

When a capacitance type or gap sensor is used, it is necessary to mount it while detecting displacement of the rotary shaft so as not to be damaged by contact, etc., and mounting is difficult, resulting in poor long-term reliability. Moreover, there is also a problem that the measurement requires a zero adjustment, which complicates the measurement.

The present invention is intended to solve the above-mentioned drawbacks of the prior art and to provide a bearing wear amount detecting device which is capable of directly detecting the wear amount of a bearing with high accuracy, is easy to install and is highly reliable. is there.

[0008]

In order to solve the above-mentioned problems, the bearing wear amount detecting device of the present invention arranges thin-film resistors having a constant resistance value at a constant interval in an insulator. A wear sensor is constructed by connecting both ends of the body with conductors, and this wear sensor is embedded in the bearing so that it wears as the bearing wears.On the other hand, a temperature sensor for detecting temperature is installed in the bearing near this wear sensor. The present invention is characterized in that calculation display means is provided for calculating the wear amount of the bearing by correcting the resistance value due to the temperature change by the resistance change due to wear of the sensor and the temperature detection value by the temperature sensor, and displaying the wear amount.

[0009]

According to the bearing wear amount detecting device of the present invention, the thin film resistors having a constant resistance value are arranged in the insulator at regular intervals, and the both ends of each thin film resistor are made of a conductor. Connected and connected in parallel to form a wear sensor, which was embedded in a bearing to wear the thin film resistor in order from the outside as the bearing wears. The resistance value due to temperature change is corrected by the temperature detection value of the temperature sensor to calculate and display the wear amount of the bearing.By simply embedding the wear sensor in the bearing, the wear amount of the bearing can be detected easily and accurately. become.

As a result, the amount of wear of the bearing can be constantly monitored to know when to replace the metal of the bearing, and troubles can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic configuration diagram and a detailed sectional view according to an embodiment of a bearing wear amount detecting device of the present invention.

The bearing wear amount detecting device 10 is for directly detecting the wear amount of the metal 3 mounted on the back metal 2 of the sliding bearing 1, and as shown in FIG. A wear sensor 11 that constitutes a bearing wear amount detection device 10 is embedded in the back metal 2 portion, and wear is detected together with the metal 3 for detection.

As shown in FIG. 1 (b), the wear sensor 11 constituting the bearing wear amount detecting device 10 includes thin film resistors 12 which are laminated at equal intervals L (for example, eight thin film resistors). 12-1 to 12-8 are stacked and arranged.) Connecting wires 13 are connected to both ends of the thin film resistor 12 to connect the thin film resistors 12 in parallel, and to connect the thin film resistors 12 to each other. An insulator 14 is inserted between the two, and the periphery is also surrounded by the insulator 14.

As the thin film resistor 12 constituting such a wear sensor 11, for example, nichrome, an alloy containing nichrome as a main component, anticonductor, copper / constantan, etc. is used, and each thin film resistor 12 itself has a thickness. About 0.01 mm,
The length is a metal thickness +1.0 mm, the diameter is about 3 mm, and the constant interval L for stacking is about 0.1 mm.

Further, the insulators 14 arranged between the thin film resistors 12 and around the thin film resistors 12 electrically insulate the thin film resistors 12 from each other, and thereby the thin film resistors 12 are kept constant. The distance L is maintained.

As such an insulator 14, for example, silicon, resin, carbon or the like is used, and each insulator 14 is formed in a thickness of about 0.09 mm corresponding to a constant interval L.

The wear sensor 11 thus constructed
May be formed by alternately stacking the thin film resistor 12 and the insulator 14 at a constant interval L, and the thin film resistor 12 and the insulator 1 may be formed.
4 may be separately prepared and then assembled, or a thin film resistor 12 and an insulator 14 may be alternately deposited by a thin film forming technique such as a vapor deposition method to form an integral structure.

A thin film resistor 12 surrounded by the insulator 14.
The wear sensor 11 provided with is housed in a cylindrical sensor protection case 15 having a hole in the upper part, and two connecting wires 13 are led out through the bottom part. The sensor protection case 15 is embedded in the slide bearing 1 together with the wear sensor 11 and wears together with the metal 3. Therefore, it is necessary to prevent the function of the slide bearing 1 from being affected, so that the diameter is about 7 mm and the length is 20 mm. For example, it is made of white metal.

A thermocouple thermometer, for example, is attached to the bottom of the sensor protection case 15 as the temperature sensor 16 and extends through the bottom so that resistance correction due to temperature change can be performed. It is like this.

The wear sensor 11 and the temperature sensor 16 housed in such a sensor protection case 15 are the parts where the wear of the metal 3 of the slide bearing 1 is estimated to progress most,
For example, it is embedded in the bottom portion of the metal 3 shown in FIG. 1 and is attached in a state where the surface of the metal 3 and the surface of the wear sensor 11 coincide with each other.

These wear sensor 11 and temperature sensor 1
A calculation / display means 17 is provided for calculating the wear amount of the metal 3 from the detection result of 6 and for displaying the result.

The sensor lead wires 18 are connected to the connecting wires 13 that penetrate the backing metal 2 of the plain bearing 1 and are connected to both ends of each thin film resistor 12, and the calculation / display means 1 is connected.
Power source 19 for measuring resistance in 7, voltmeter 20, ammeter 21
Similarly, the temperature sensor 16 is connected to the thermocouple thermometer 22 in the calculation / display means 17.

Further, the signals of the voltmeter 20, the ammeter 21, and the thermocouple thermometer 22 are sent to the arithmetic processing unit 23 in the arithmetic / display means 17, and the calculated wear amount is displayed on the display unit 24. Is displayed.

The bearing wear amount detection device 10 detects the bearing wear amount as follows.

When the rotating shaft 4 supported by the slide bearing 1 is operated, the wear sensor 11 is worn together with the sensor protection case 15 at the same time as the metal 3 is worn, and the thin film resistor 12 is worn in order from the outer side. Thin film resistor 12
And the resistance of the wear sensor 11 as a whole also decreases.

This change in resistance is reflected by the voltmeter 20 and the ammeter 2.
1 is input to the arithmetic processing unit 23, and the temperature measurement result of the temperature sensor 16 is displayed by the thermocouple thermometer 22.
Is input to the arithmetic processing unit 23.

The arithmetic processing section 23 performs arithmetic processing as follows. The total measurement resistance R of the wear sensor 11 is calculated by the following equation, where V is voltage and I is current. R = V / I Further, if the number of thin film resistors 12 is n, the following relationship exists between the total measurement resistance R of the wear sensor 11 and the resistance r of each thin film resistor 12. R = 1 / (Σ1 / r) Further, the correction of the resistance r of each thin film resistor 12 by the temperature T is
If the reference temperature is T0, the following equation can be used. r = a + (T-T0) * b where a and b are constants and are determined in advance by the material of the thin film resistor 12, and in the case of nichrome described in the above embodiment, a = 100 to 110 .mu..OMEGA.cm. , B =
It is 0.03-0.4 degreeC.

Accordingly, the total resistance R of the wear sensor 11 when the temperature is corrected is calculated by the following equation. R = 1 / {1 / [a + (T-T0) .b] .n} From this equation, the number n of the thin film resistors 12 is obtained by the following equation. n = 1 / {1 / [a + (T−T0) · b] · R} Therefore, since the distance L between the thin film resistors 12 laminated on the wear sensor 11 is constant, The height H is obtained as follows. H = n · L Thus, when the current height H of the wear sensor 11 is obtained, the wear amount ΔH of the metal 3 is obtained from the change amount,
This value is displayed on the display unit 24.

Since the arithmetic processing is performed in this manner and the present wear amount can be displayed on the display unit 24,
It becomes possible to constantly monitor the wear amount of the metal 3, know the replacement time of the metal 3, and prevent troubles.

Further, since the amount of wear detected by the wear sensor 11 is the same as the amount of wear of the metal 3, accurate measurement can be performed, and the temperature change is detected and corrected by the temperature sensor 16. The amount of wear can be calculated by accurately measuring the resistance change.

Furthermore, the structure of the wear sensor 11 can be made into a simple and small chip shape, mass production is possible, reliability is high, and it can be manufactured at low cost.

Further, the wear sensor 11 and the temperature sensor 1
When mounting 6, the sensor protection case 15 is simply embedded in the metal 3 of the plain bearing 1, which is simple.

In the above embodiment, the sliding bearing supporting the horizontally arranged rotating shaft has been described, but the sliding bearing supporting the vertical rotating shaft can be similarly applied.

Further, in the above embodiment, the case where only one wear sensor and one wear sensor are embedded has been described, but a plurality of wear sensors may be installed.

Further, the present invention is not limited to the above-mentioned embodiment, and each constituent element may be modified within a range not changing the gist of the invention.

[0036]

As described above in detail with reference to one embodiment, according to the bearing wear amount detecting device of the present invention, thin film resistors having a constant resistance value are laminated in an insulator at regular intervals. Each thin film resistor is connected by conductors and connected in parallel to form a wear sensor, which is embedded in the bearing to wear the thin film resistor in order from the outside as the bearing wears. Since the calculation display means is used to calculate and display the wear amount of the bearing by correcting the resistance value due to the temperature change based on this resistance change and the temperature detection value of the temperature sensor mounted in the vicinity of the wear sensor, The bearing wear amount can be detected easily and accurately simply by embedding it in the bearing.

As a result, the amount of wear of the bearing can be constantly monitored to know when to replace the metal of the bearing, and the occurrence of trouble can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram and a detailed sectional view according to an embodiment of a bearing wear amount detection device of the present invention.

[Explanation of symbols]

 1 sliding bearing 2 back metal 3 metal 4 rotating shaft 10 bearing wear detector 11 wear sensor 12 thin film resistor 13 connecting wire 14 insulator 15 sensor protective case 16 temperature sensor 17 calculation / display means 18 sensor lead wire 19 power supply 20 voltmeter 21 ammeter 22 thermocouple thermometer 23 arithmetic processing unit 24 display unit L interval between thin film resistors

Claims (1)

[Claims] 1. A wear sensor is formed by arranging thin film resistors having a constant resistance value at regular intervals in an insulator and connecting both ends of these thin film resistors with conductors to form a wear sensor. It is embedded in the bearing so that it wears with the wear of the wear sensor, while a temperature sensor that detects the temperature is installed in the bearing near this wear sensor, and the resistance change caused by the wear of these wear sensors and the temperature detection value by the temperature sensor A bearing wear amount detection device, characterized in that a calculation display means for correcting the above to calculate the bearing wear amount and displaying the calculated wear amount is provided.