JPH0791904A - Measuring device for shaft centering - Google Patents

Abstract

PURPOSE:To easily calculate the off-center amount by fixing a support arm to a rotary shaft, rotating a casing at the tip together with the rotary shaft, determining a plurality of rotation angles of the casing facing the circumferential surface or the end surface of a fixed shaft, and detecting the facing displacement corresponding to each rotation angle. CONSTITUTION:By providing a stand 5 of which base end 51 is attracted by magnetism to the circumference of a rotary shaft S1, a casing 1 is slantingly fixed at the tip putting arms 52, 53 in between. Inside of it, an electric micrometer having a contactor 23 of which tip is touching the inner surface of the fixed shaft S0, and a piezoelectric vibration gyro are provided. When the shaft S1 is rotated, the micrometer outputs a signal in accordance with the relative displacement of he shafts S1 and S0 and the gyro outputs a signal proportional to the rotational angular velocity of the casing 1. An arithmetic device 4 integrates the angular velocity to obtain a rotational angle position and reads in the relative displacements at each angle of rotation initiation position, 90 degree, 180 degree, and 270 degree, an calculates the parallel shift in X-direction and Y-direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for centering a shaft, and more particularly to a measuring device for centering which has a simple structure and can easily measure the amount of misalignment.

[0002]

2. Description of the Related Art Conventionally, the amount of misalignment required for the fitting of opposing shafts and the centering at the time of machining has been required as follows, which requires a great deal of labor. That is, one of the shafts facing each other is a fixed shaft and the other is a rotary shaft, and the rotary shaft is electrically or manually rotated and stopped at at least four angular positions (for example, 0 °, 90 °, 180 °, 270 °). At the very least, the amount of deviation from the fixed shaft at this time is measured by a displacement sensor such as a dial gauge to calculate the amount of misalignment.

Therefore, for example, in Japanese Examined Patent Publication No. 3-9402, a laser beam projector and a planar light receiver are provided on the end faces of one of the shafts facing each other, and the above-mentioned projector emits light on the end faces of the other shaft. An apparatus has been proposed which is capable of automatically measuring the amount of misalignment by providing a right-angle prism that reflects laser light and sends it back to the light receiver.

There are two types of misalignment. That is, the axes m0 and m1 of the opposing axes S0 and S1 as shown in FIG.
Shifts parallel to each other and the axis m0 as shown in FIG.
, M1 is an angle deviation where they intersect at an angle.

[0005]

The apparatus described in the above publication meets the demand for quickness of centering work in that the amount of deviation for centering is automated, but one shaft has a cylindrical shape. In principle, it is difficult to measure the misalignment of the inner peripheral surface required for fitting in the case of a body. In addition, many constituent devices such as a laser emitter, a prism, a condenser lens, and a light receiver are required, and it is necessary to accurately assemble these devices, and the structure is relatively complicated, large and expensive, It cannot be easily used for centering work in normal machining.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a shaft centering measuring device capable of measuring the shaft misalignment amount with a simple and inexpensive structure.

[0007]

The structure of the present invention will be described. One of the facing shafts is a fixed shaft S0 and the other is a rotating shaft S.
A reference numeral 1 is a shaft centering measuring device for measuring the amount of misalignment of both shafts S0 and S1, and a support arm 5 having a base end detachably fixed to the peripheral surface of the rotating shaft S1. A casing 1 that is fixed to the tip of the support arm 5 and swivels around its center as the rotating shaft S1 rotates, and is housed in the casing 1 and always faces the peripheral surface or the end surface of the fixed shaft S0 during the swirling process of the casing 1. The means 2 for detecting the amount of relative opposed displacement of the peripheral surface or the end surface, and the casing 1
The means 3 which is housed in the casing 1 for detecting the turning angle position of the casing 1 and the predetermined turning angle position of the casing 1 are set to 0 °.
Then, with the facing displacement amount at this time set to 0, the amount of misalignment between the rotary shaft S1 and the fixed shaft S0 is calculated from the respective facing displacement amounts detected at the respective turning angle positions of at least 90 °, 180 ° and 270 °. And means 4.

[0008]

In the apparatus having the above structure, when performing the centering work, the support arm 5 is fixed to the rotary shaft S1 and the casing 1 at the tip thereof is positioned so as to face the end surface or the peripheral surface of the fixed shaft S0. When the rotary shaft S1 is rotated in this state, the turning angle position detecting means 3 provided in the casing 1 detects the turning angle position of the casing 1, and at the same time, the opposing displacement amount detecting means 2 detects the turning angle position at each turning angle position. The relative opposing displacement amount of the peripheral surface or the like is detected. Then, the misalignment amount calculating means 4 calculates the misalignment amount of the rotary shaft S1 and the fixed shaft S0 from the facing displacement amount at least at each of the four turning angle positions.

In the apparatus of the present invention, the support arm 5 is fixed to the rotary shaft S1, and the opposed displacement amount detecting means 2 of the casing 1 is made to face the peripheral surface or the end surface of the fixed shaft S0 so that the rotary shaft S1.
By making one rotation, the misalignment amounts of the shafts S0 and S1 facing each other can be easily known. When the fixed shaft S0 is a tubular body,
If the facing displacement amount detecting means 2 is positioned so as to face the inner peripheral surface of the fixed shaft S0, the amount of misalignment of the inner peripheral surface can be calculated.

Since the turning angle position detecting means 3 and the facing displacement amount detecting means 2 are housed in the casing 1, the device configuration is simple and compact as compared with the device described in the above-mentioned publication cited as the prior art, and the measurement is performed. It is very easy to assemble the equipment at this time.

[0011]

[Embodiment 1] FIG. 1 shows an example of measuring the parallel displacement of opposed shafts. The fixed fixed shaft S0 is a cylindrical body, and its axis m0 is displaced by a certain amount in parallel with the axis m1 of the rotating shaft. There is. The rotating shaft S1 is rotationally driven by a motor or the like, and a magnet stand 5 as a supporting arm having a base end 51 attracted by a magnet is provided on the outer periphery of the rotating shaft S1.

Arms 52 and 53 of the magnet stand 5
Are connected so as to be rotatable relative to each other and bent in a V shape, and an arm 54 capable of relative rotation is further bent and connected in an inverted V shape at the tip thereof, and the casing 1 of the sensor is tilted and fixed to the tip. Has been done. A lever contact 23 of an electric micrometer, which will be described later, protrudes from the casing 1 and its tip abuts on the inner peripheral surface of the fixed shaft S0.

FIG. 2 is a block diagram showing the structure of the sensor housed in the casing 1. The sensor is the contactor 2 described above.
The electric micrometer 2 (for example, Mitutoyo Electric Micrometer Code No. 519-322) and the piezoelectric vibration gyro 3 (for example, Murata Manufacturing Co., Ltd. Gyrostar model ENV-05S) connected to the 3rd. It comprises a mechanical displacement section 21 directly connected to the child 23 and an electric conversion section 22 such as a differential transformer for converting the mechanical displacement into an electric signal. Then, the output signals of the electric micrometer 2 and the piezoelectric vibration gyro 3 are sent to the external arithmetic unit 4 by the cable 41 (FIG. 1).

When measuring the amount of deviation, when the rotary shaft S1 is driven to rotate, the casing 1 turns around the axis m1 of the rotary shaft S1, and the contact 23 becomes a relative displacement amount of the inner peripheral surface of the fixed shaft S0. Accordingly, the electric micrometer 2 is bent and stretched, and an electric signal corresponding to the moving amount is output from the electric micrometer 2. Rotation axis S
The moving direction of the contactor 23 when 1 rotates once from 0 ° is schematically shown by an arrow in FIG.

As the casing 1 turns, an output signal proportional to the angular velocity is output from the piezoelectric vibrating gyro 3, and the arithmetic unit 4 integrates the angular velocity signal to calculate the turning angular position. Then, the turning start position is set to a turning angle of 0 °, the output signal of the electric micrometer 2 at this time (that is, the relative displacement amount of the inner peripheral surface of the fixed shaft) is set to 0 level, and thereafter, 9
At each angular position of 0 °, 180 °, and 270 °, the output signal is read and the parallel displacement amounts in the X direction and the Y direction are calculated by the following equation. X = (90 ° position output signal-270 ° position output signal) / 2 Y = (180 ° position output signal-0 ° position output signal)
/ 2

FIG. 4 shows a case where the angle deviation is measured by the apparatus of this embodiment. In this case, the contact 23 is brought into contact with the end surface of the fixed shaft S0 as shown in the drawing, and in this state, the casing 1 is swung together with the rotary shaft S1. Fixed axis S
Since the end surface of 0 is inclined, the amount of relative displacement of the end surface relative to the casing 1 changes with the turning,
The contactor 23 moves to generate an electric signal corresponding to the amount of opposite displacement.

Therefore, the turning angle of the measurement start position is set to 0 °.
Then, the output signal of the electric micrometer 2 at this time (that is, the relative displacement amount of the fixed shaft end surface) is set to 0 level, and thereafter, the output signals at the respective angular positions of 90 °, 180 ° and 270 ° are read. From the following formula, the X direction on the turning surface,
The angle shift amount in the Y direction is calculated. X = (90 ° position output signal-270 ° position output signal) × 100 (mm) / turning diameter (mm) Y = (180 ° position output signal-0 ° position output signal)
X100 (mm) / turning diameter (mm) From this, the amount of deviation in the direction perpendicular to the turning surface, that is, the amount of angular deviation, at a radius of 10 cm from the turning axis m1 is known.

[0018]

[Embodiment 2] Since the electric power consumption of the electric micrometer and the piezoelectric vibrating gyro accommodated in the casing 1 is relatively small, a power supply battery and a transmission circuit are further provided in the casing 1, and as shown in FIG. A signal may be wirelessly transmitted from the antenna 11 provided in the above to the antenna 42 provided in the arithmetic unit 4. This eliminates the need for a cable between the casing and the arithmetic unit, so that it is possible to avoid problems such as winding of the cable when the casing is turned.

In the first embodiment, the amount of misalignment of the inner peripheral surface was measured, but the contact 23 of the casing 1 is fixed to the fixed shaft S0.
If the outer peripheral surface is brought into contact with the outer peripheral surface, the misalignment amount of the outer peripheral surface can be similarly measured.

In each of the above-mentioned embodiments, the displacement amount in the X and Y directions is calculated by inputting the facing displacement amount of the peripheral surface or the end face into the arithmetic device at four angular positions of 90 °, but still another angular position. It is also possible to input the amount of opposing displacement and calculate the amount of deviation in directions other than the X and Y directions.

The electric micrometer as a means for measuring the amount of opposed displacement and the piezoelectric vibrating gyro as a means for detecting the turning angle position are merely examples, and it goes without saying that a sensor based on another principle can be used.

[0022]

As described above, according to the centering measuring device of the present invention, the sensor casing is provided at the tip of the supporting arm that is easily fixed to one of the opposing shafts, and the centering of the inner peripheral surface is corrected. It is possible to easily and inexpensively measure the misalignment between the included axes.

[Brief description of drawings]

FIG. 1 is an overall side view of a measuring device showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a sensor configuration in a casing.

FIG. 3 is a diagram schematically showing a moving direction of a contact.

FIG. 4 is an overall side view of a measuring device when measuring an angle deviation.

FIG. 5 is an overall side view of a measuring device according to another embodiment of the present invention.

FIG. 6 is a schematic side view illustrating a parallel deviation of axes.

FIG. 7 is a schematic side view illustrating an angle deviation of a shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 casing 2 electric micrometer (opposing displacement amount detecting means) 3 piezoelectric vibration gyro (turning angle position detecting means) 4 arithmetic unit (core deviation amount calculating means) 5 magnet stand (supporting arm) S0 fixed axis S1 rotating axis

Claims (1)

[Claims] 1. A centering measuring device for a shaft, wherein one of the facing shafts is a fixed shaft and the other is a rotating shaft, and the amount of misalignment of both shafts is measured. The measuring device is removable from the peripheral surface of the rotating shaft. A support arm whose base end is fixed, a casing fixed to the tip of the support arm and swiveling around its center with the rotation of the rotary shaft, and a casing housed in the casing that constantly rotates the fixed shaft during the swiveling process of the casing. A means for detecting a relative opposing displacement amount of the peripheral surface or the end surface facing the peripheral surface or the end surface; a means for detecting a turning angle position of the casing housed in the casing; When the turning angle position is 0 ° and the facing displacement amount at this time is 0, the amount of misalignment between the rotary shaft and the fixed shaft is calculated based on the facing displacement amount detected at each turning position of at least 90 °, 180 °, and 270 °. Means to calculate Centering measuring device of the shaft having a.