JPH05346323A - Examination of spline wear - Google Patents

Abstract

PURPOSE:To accurately know the wear condition of spline teeth without releasing the spline. CONSTITUTION:Relating to wear examination of a spline, a spline drive shaft 1 having spline grooves is provided with displacement gages 3 and 4 and transmitters 5 and 6 which transmit the output signal of them on radio wave. The displacement gages 3 and 4 continuously measure how a specific point on the outer peripheral surface of a spline coupled drive wheel 2 having spline teeth displaces relative to a specific paint, used as reference, on the outer peripheral surface of the spline drive shaft in the direction of circumference or diameter by accelerating/decelerating the spline drive shaft 1. The output signal of the displacement gages 3 and 4 is transmitted by the transmitters 5 and 6 on radio wave, and is continuously received by a receiver 8 installed on the ground. The wear amount of a spline teeth is known from the difference between the maximum and minimum displacement values received. Therefore, a facility is not required to stop, so maintenance cost decreases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention continuously measures how a specific point of a spline driven shaft is displaced circumferentially or diametrically with reference to a specific point of a rotating spline drive shaft. , A method of diagnosing the wear state of spline teeth based on the measured values.

[0002]

BACKGROUND OF THE INVENTION Splines are used to connect shafts for power transmission and holes. Of the splines, the rectangular spline is stipulated in JIS B 1601 in terms of size and shape. It is easy to replace because it does not require centering, suitable for low speed rotation, and because the structure is simple, the purchase cost is low, and so on. Used in various machines. Further, in a steel mill, it is applied to a place where the transport roller expands and contracts in the axial direction due to heat, such as the transport roller used for the transport tables on the front and rear surfaces of the hot rolling mill.

A conveying roller using a spline is shown in FIG.
The explanation is as follows. That is, the rotary shaft 22 of the transport roll 21 is rotatably supported by bearings 25 and 26 attached to bearing mounts 23 and 24 at both ends. The drive-side end 22a of the rotary shaft 22 is formed with spline teeth, and the rotary shaft 2
2 is a spline driven shaft. On the other hand, the electric motor 27
A rotating shaft 28 driven by the above is rotatably supported by bearings 31 and 32 attached to bearing mounts 29 and 30, respectively. A spline hole into which the spline driven shaft having the plurality of spline teeth is fitted is formed by the connecting portion 33 at the tip 28a of the rotary shaft 28.

The connection between the spline drive shaft 28 and the spline driven shaft 22 will be described with reference to the cross sectional view of FIG. That is, a plurality of spline grooves 36 into which the spline teeth 35 of the spline driven shaft 22 are fitted are formed along the inner peripheral surface of the spline hole 34 of the spline drive shaft 28. The spline teeth 35 can slide in the axial direction along the spline groove 36. Therefore, even if the spline driven shaft 22 extends in the longitudinal direction due to the high temperature of the conveyed object, the spline teeth 35 will not move.
6 slides in the axial direction, so the spline driven shaft 2
The power to bend 2 does not work. Then, the bottom surface 33 of the connecting portion 33 of FIG. 6 is arranged so that the spline teeth 35 can slide.
a and the drive-side end 22 of the rotary shaft 22 of the transport roll 21
There is a certain amount of space between a.

There is a certain amount of clearance between the spline teeth 35 and the spline grooves 36 shown in FIG. 7 so that the spline driven shaft 22 can slide smoothly together with the spline teeth 35. Therefore, spline teeth 3
Since 5 is always pressed against the splice groove 36 and separated from it, a frictional force acts and wears.

Therefore, it is necessary to regularly inspect and grasp the wear state of the spline teeth, and the following method has been conventionally used as a method for inspecting the wear state of the spline teeth. (1) When the equipment is stopped on a repair date, the spline driven shaft is pulled out from the spline hole, and the wear amount is directly measured with a measuring instrument. (2) Without opening the spline shaft, set a dial gauge on the upper surface of the connection part where the spline hole is provided, and normally rotate to see how much play (play) exists between the groove of the spline hole and the spline shaft.・ By reversing and measuring,
Estimate the amount of wear.

[0007]

However, any of the conventional methods for inspecting the wear state of spline teeth has the following problems. (1) Systematic inspection cannot be performed because the inspection can only be performed when the equipment is stopped. In addition, since it is opened, construction costs are required. (2) If the spline shaft becomes longer, the spline shaft will drop from the center of rotation as much as the spline teeth wear, so it is necessary to pull up the spline shaft to the center of rotation in order to obtain a correct measurement value. Is difficult to detect.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is possible to accurately wear the spline teeth without removing the spline driven shaft and even when the spline teeth are greatly worn. An object of the present invention is to provide a spline wear diagnosis method capable of detecting the amount.

[0009]

SUMMARY OF THE INVENTION A spline wear diagnosis method according to the present invention is provided with a spline drive shaft having a groove of the spline, a displacement gauge and a transmitter for wirelessly transmitting an output signal of the displacement gauge. How the specific point on the outer peripheral surface of the spline driven shaft having the spline teeth with respect to the specific point on the outer peripheral surface is displaced in the circumferential direction or the diametrical direction while accelerating and decelerating the spline drive shaft While continuously measuring with a meter, the output signal of this displacement meter is wirelessly transmitted by the transmitter, and this signal is continuously received by a receiver installed on the ground, and the minimum and maximum values of the received displacement It is characterized in that the wear amount of the spline teeth is grasped from the difference between.

[0010]

In the method of diagnosing wear of a spline according to the present invention, a displacement gauge is provided on the spline drive shaft, and the specific point on the outer peripheral surface of the spline driven shaft is set to the circumference with reference to the specific point on the outer peripheral surface of the spline drive shaft. It measures the displacement in the direction or the diametrical direction. The reason for this is that if the spline teeth are worn in the width direction, a gap is created between the width direction wall of the spline groove and the spline teeth.

When the teeth of the spline are in contact with one wall of the spline groove during rotation, the spline drive shaft outer peripheral surface extends from a specific point on the outer peripheral surface of the spline driven shaft in a circumferential direction. The amount of displacement is the smallest, and when the tooth of the spline is in contact with the other wall of the spline groove, the displacement of the specific point on the outer peripheral surface of the spline driven shaft from the specific point on the outer peripheral surface of the spline drive shaft is the largest. Is established. Since the spline teeth can move in the width direction in the width direction by a distance obtained by subtracting the smallest displacement amount from the largest displacement amount, the movable distance is irreversible and the wear amount in the width direction. You can understand if there is.

If the spline teeth are worn in the height direction, there is a maximum displacement amount and a minimum displacement amount for the same reason as described above. can do. Therefore, if the maximum value and the minimum value of the displacement can be grasped by converting such a distance value into an electric signal and transmitting it wirelessly and receiving this signal on the ground, the wear amount of the spline tooth can be measured during operation. can do.

The reason for accelerating and decelerating the spline drive shaft for measuring the displacement is as follows.
That is, the spline driven shaft 22 is replaced by the spline drive shaft 2
If there is misalignment with respect to 8, spline teeth 3
In the spline groove 36a, as shown in FIG. 8 (a), before the 5a hits the other wall 37b from the state of being in contact with the other wall 37a, as shown in FIG.
Since b comes into contact with one wall 37c in the other spline groove 36b, the movement of the spline teeth 35a stops at that position, the displacement is small, and therefore the wear amount is apparently small, and an accurate wear amount cannot be measured. When the spline drive shaft is rotated at a constant speed, the end portion of the spline driven shaft, which is offset from the center, has a relatively small whirl. Therefore, in this case, the phenomenon that the displacement amount and the wear amount of the spline teeth do not match as described above cannot be eliminated.

On the other hand, when the spline drive shaft is accelerated and decelerated and rotated, the misaligned end of the spline driven shaft, which has spline teeth, swings largely in the spline hole 34, and FIG. As shown in FIG. 9B, the spline teeth 35 are not in contact with one wall 37a of the spline groove 36, but the spline teeth 35 are not in contact with both walls 37a and 37b of the spline groove 36 as shown in FIG. 9B. After the state, as shown in FIG. 9C, a state in which the spline teeth 35 are in contact with the other wall 37b of the spline groove 36 also appears. Therefore, the wear amount can be obtained by measuring the displacement amount in each state and subtracting the minimum value from the maximum value.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spline wear diagnosis method according to one embodiment of the present invention will be described with reference to FIG. In the spline wear diagnosis method according to the first embodiment of the present invention, a dial gauge type displacement gauge 3 for measuring the circumferential displacement of a spline driven shaft 2 at a specific point on the spline drive shaft 1, and a spline driven shaft 2 are used.
Dial gauge type displacement gauge 4 for measuring the diametrical displacement amount of the specific point, FM telemeter transmitter 5 for wirelessly transmitting the circumferential displacement amount output signal, and diametrical displacement amount output signal for wireless An FM telemeter transmitter 6 for transmitting is provided. Then, the spline driven shaft 2 is provided with a target 7 in order to grasp how the specific point of the spline driven shaft 2 is displaced in the circumferential direction and the diametrical direction from the specific point of the spline drive shaft 1 and a dial gauge is provided. The measuring elements 3a and 3b at the tips of the anvils of the displacement gauges 3 and 4,
The side surface 7a and the upper surface 7b of the target 7 are brought into contact with each other.

After arranging the measuring device as described above, the spline drive shaft 1 is rotated while being accelerated or decelerated, and the circumferential displacement amount and the diametrical displacement amount of the spline driven shaft 2 are continuously measured. The measured displacement amount is converted into an electric signal, wirelessly transmitted by the FM telemeter transmitters 5 and 6, and received by the FM telemeter receiver 8 provided on the ground,
The received result is recorded in the pen recorder 9.

FIG. 2 is an explanatory view of the measurement principle for measuring the wear amount in the width direction of the spline tooth when the spline driven shaft is not misaligned, but as shown in FIG. When the dial gauge type displacement meter 3 is in contact with one wall 37a of the spline groove 36 and the dial gauge type displacement meter 3 is in contact with the target 7, the pointer 10 is set so as to indicate 0. When the spline teeth 35 are displaced into contact with the other wall 37b of the spline groove 36 as shown in FIG. 2B, the pointer 10 of the dial gauge type displacement meter 3 is displaced.
Rotates and indicates a numerical value commensurate with the amount of displacement.

The graph of FIG. 3 represents the change in the circumferential displacement of the spline driven shaft measured while rotating the spline drive shaft at a constant speed (200 rpm) when the spline driven shaft is misaligned. Is. In this graph, the difference between the maximum and minimum displacements is not large, and the wear amount is 1
It seems that the size is as small as about mm.

However, when the same thing is measured while changing the speed in the speed pattern as shown in FIG. 4,
It becomes like the graph of FIG. The difference between the maximum value and the minimum value of the displacement amount in this graph, that is, the wear amount is 3.1 mm, and it can be seen that the accurate wear amount of the spline tooth cannot be measured unless it is measured by the method according to the present invention. ..

[0020]

According to the present invention, the wear state of spline teeth can be easily and accurately grasped without opening the spline.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a spline wear diagnosis method according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a measurement principle for measuring the wear amount in the width direction of the spline teeth when the spline driven shaft does not cause misalignment.

FIG. 3 is a graph showing a change in the displacement amount in the circumferential direction of the spline driven shaft, which is measured while rotating the spline drive shaft at a constant speed when the spline driven shaft is misaligned.

FIG. 4 is a graph of a speed pattern when the wear amount of the spline teeth in the width direction is measured while accelerating and decelerating the speed of the spline drive shaft.

FIG. 5 is a graph showing a change in displacement amount when the displacement amount in the circumferential direction of the spline driven shaft is measured by rotating the spline drive shaft while accelerating and decelerating when the spline driven shaft is misaligned. Is.

FIG. 6 is an explanatory diagram of equipment using a spline.

FIG. 7 is an explanatory diagram illustrating a mechanism of a spline.

FIG. 8 is an explanatory diagram showing that the displacement amount is smaller than the wear amount when the spline driven shaft is misaligned.

FIG. 9 is an explanatory diagram showing a measurement principle when the displacement amount of the spline driven shaft in the circumferential direction is measured by rotating the spline drive shaft while accelerating and decelerating when the spline driven shaft is misaligned. is there.

[Explanation of symbols]

 1 Spline drive shaft 2 Spline driven shaft 3 Dial gauge type displacement gauge 4 Dial gauge type displacement gauge 5 FM telemeter transmitter 6 FM telemeter transmitter 7 Target 8 FM telemeter receiver 9 Pen recorder 10 Dial gauge pointer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Izumi Terada 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Shoji Kobayashi 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Main Steel Pipe Co., Ltd.

Claims (1)

[Claims] 1. A spline driving shaft having a groove of a spline, provided with a displacement gauge and a transmitter for wirelessly transmitting an output signal of the displacement gauge, and a spline having spline teeth with a specific point on the outer peripheral surface of the spline driving shaft as a reference. How the specific point on the outer peripheral surface of the driven shaft is displaced in the circumferential direction or the diametrical direction is continuously measured by the displacement meter while accelerating and decelerating the spline drive shaft, and the output signal of this displacement meter is also measured. Is transmitted wirelessly by the transmitter, and this signal is continuously received by a receiver installed on the ground, and the wear amount of the spline teeth is grasped from the difference between the minimum value and the maximum value of the received displacement. A method for diagnosing spline wear.