JP2008122351A - Method and apparatus for centering shaft coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To center two axes of a shaft coupling for coupling the rotating shaft of a motor, with the rotary shaft of an operating machine, depending not merely in intuition. <P>SOLUTION: While the shaft coupling (26,) consisting of a main flange (22) provided at the tip of the rotary shaft (14) of the motor and a subordinate flange (24) provided at the tip of the rotary shaft (18) of the operating machine, is integrally rotated, while coupled by temporarily fixing, changes in the axial relative distance and the radial relative distance between a point on a facing surface of the main flange and a point on the opposite surface of the subordinate flange facing the former point are measured. Thus, misalignment in the centers of a shaft core (14a) of the rotary shaft of the motor, and a shaft core (18a) of the rotary shaft of the operating machine is calculated, and the horizontal and vertical orientations and positions of the operating machine and the motor are adjusted, based on this value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a flange provided at the tip of each rotary shaft with a rotary shaft of a prime mover such as a motor or an engine, and a rotary shaft of an operating device such as a pump or a generator that operates using the rotational power of the prime mover. The present invention relates to a shaft coupling centering method and a shaft coupling centering device for performing biaxial centering (centering) without relying only on experience and feeling in shaft couplings that are coupled by being connected in an opposed state.

  When connecting the rotating shaft of a motor such as a motor and the rotating shaft of an operating device such as a pump using a coupling, it is very important to center each rotating shaft. This is because if the centering of the rotating shaft is not performed completely and there is a deviation in the axis of the rotating shaft, not only energy loss will occur, but also the motor or operating equipment will be damaged or damaged due to the occurrence of vibration, and its service life It is because it will be shortened extremely. In order to absorb slight misalignment of centering, rubber pipes are often placed in a plurality of bolt holes for fixing the flanges constituting the shaft coupling, or rubber is pinched between the flanges. Even in that case, it is important to complete the centering. This is because if there is a deviation in the centering, a compression force or a tensile force acts repeatedly on the rubber clamped between the flanges during the rotation of the motor, leading to early deterioration of the rubber.

Conventionally, the centering of a shaft joint is measured at several points using a jig as described in Patent Document 1, for example, and a dial gauge attached to the shaft joint. On the basis of this, the fixing seat forming the legs of the motor is shifted in the horizontal direction and a liner (metal thin plate) having an appropriate thickness is sandwiched under the fixing seat.
JP 2002-122406 A

  Here, to adjust the height of the motor and the tilt angle in the vertical direction from the shaft center of the pump rotation shaft in the centering operation, select a liner with an appropriate thickness, and insert the selected liner under the fixed seat of the motor. Then, the operation of measuring the result again with the dial gauge is performed by repeating until the deviation of the axis is within the allowable value. Therefore, this liner adjustment often depends on experience and feeling, and there is a problem that adjustment work takes time.

  The present invention has been made to solve such problems. That is, an object of the present invention is to provide a shaft for performing centering of two axes without relying only on experience and feeling when connecting the rotating shaft of the prime mover and the rotating shaft of the operating device using a shaft coupling. A joint centering method and a shaft joint centering device are provided.

  In order to achieve the above object, a first aspect of the present invention provides a rotating shaft (14) of a motor (12) such as a motor or an engine, and a rotating shaft of an operating device (16) that operates using the rotating power of the motor. (18) is fixed to the main flange (22) provided at the front end of the rotary shaft of the prime mover and the slave flange (24) provided at the front end of the rotary shaft of the operating device. A centering method of a shaft coupling when connecting using a joint, when the main flange and the secondary flange are connected together by temporary fixing and are rotated together, one point of the opposing surface (23) of the main flange And the change of the relative distance in the axial direction and the relative distance in the radial direction between the opposite surface of the slave flange facing this point and the change in the relative distance in the radial direction, the axis (14a) of the rotating shaft of the prime mover and the rotating shaft of the operating device Core with shaft core (18a) Le is calculated and adjusting the orientation and position of the horizontal and vertical operation device or the prime mover on the basis of the value, characterized in that.

  According to the second and third aspects of the present invention, there is provided a rotating shaft (14) of a motor (12) such as a motor or an engine, and a rotating shaft (18) of an operating device (16) operated using the rotating power of the motor. Using a shaft coupling (26) having a structure in which a main flange (22) provided at the tip of the rotary shaft of the prime mover and a slave flange (24) provided at the tip of the rotary shaft of the operating device are opposed to each other. A shaft coupling centering device for use in centering when connecting, a vertical distance sensor (32) for measuring a radial distance from an outer peripheral edge of the main flange (or secondary flange); A horizontal distance measuring sensor (34) for measuring an axial distance from the outer peripheral edge of the flange (or secondary flange), and a vertical distance measuring sensor and the horizontal distance measuring sensor fixed to the outer peripheral edge of the secondary flange (or main flange). Hold the distance sensor And capacitors attaching jig 36 comprises a display device (38) for displaying a radial distance and the axial distance measured by the vertical distance measuring sensor and the horizontal distance measuring sensor, characterized in that.

  Here, as described in claim 4, the ends of the outer peripheral edges of the main flange (22) and the sub-flange (24) are bent at right angles to the opposite side to the opposing surface (23) to form ring-shaped flanges. (27), and the sensor mounting jig (36) includes a clamp part (42) for gripping the flange part in the radial direction, and the vertical distance measuring sensor (32) extending from the clamp part, An L-shaped sensor mounting portion (44) that holds the horizontal distance measuring sensor (34) in close proximity to the main flange in a non-contact manner is used.

  According to the shaft coupling centering method and the shaft coupling centering device of the present invention, when the main flange at the tip of the rotating shaft of the prime mover and the slave flange at the tip of the rotating shaft of the operating device are temporarily fixed and rotated, By measuring the change in the axial and radial distance of the motor, the axis of the prime mover is displaced in the vertical plane (and in the horizontal plane) with respect to the axis of the operating device, and in the vertical plane (and in the horizontal plane) You can see how it is tilted. In particular, it is necessary to make adjustments by inserting the liner under the fixed seat of the prime mover, and it is necessary to adjust the displacement and inclination of the prime mover shaft core in the vertical plane, which took a lot of time for the adjustment work. Since it is possible to easily know which position of the fixing seat should be selected by selecting a liner having such a thickness, the centering operation can be completed quickly without depending on experience and feeling.

  In general, the main flange and the secondary flange have the same shape, and the end of the outer peripheral edge of the disc-shaped flange is bent perpendicularly to the opposite side to the opposite surface, thereby forming a ring-shaped flange, that is, Since the back side of the opposite surface of the flange (the rotation axis side of the flange) is recessed in a concave shape, a sensor mounting jig for supporting the vertical distance measuring sensor and the horizontal distance measuring sensor is attached by clamping using this flange. Thus, it is possible to measure changes in the axial and radial distances between the flanges at predetermined positions while facilitating the attachment and detachment.

  The present invention relates to a shaft coupling that connects a rotating shaft of a motor such as a motor or an engine and a rotating shaft of an operating device such as a pump or a generator by connecting flanges provided at the tips of the respective rotating shafts to face each other. The centering method of the shaft coupling and the centering device for the shaft coupling for performing centering (centering) of the two axes without relying only on feeling. Hereinafter, after briefly explaining the structure of the shaft coupling (coupling), an embodiment of the present invention will be described.

1 and 2 are views showing an example of a shaft coupling to which the centering device of the present invention is applied. FIG. 1 is a perspective view of the shaft coupling, and FIG. 2 is a longitudinal sectional view (FIG. 2A) and It is a top view (FIG.2 (b)).
The shaft coupling described here is a so-called flange-type flexible shaft coupling that absorbs vibrations and slight displacement of the shaft center by hard rubber, which will be described later. The present invention can also be applied to a fixed shaft joint.

As shown in these drawings, the shaft coupling 26 has a structure in which two (22 in total) flanges 22 and 24 having the same shape are opposed to each other with a plurality of bolts and nuts 51 (total of six). .
The flanges 22 and 24 have, for example, a protrusion 55 having an outer diameter of 210 mm, a thickness of 36 mm, and a disc portion in which six bolt holes 53 are formed at equal intervals. Is formed, and one surface side of the disk portion is a recessed portion that is recessed except for a part between the outer peripheral edge and the protruding portion 55. That is, the disk portion includes a facing surface 23 that is a smooth surface and a rotating shaft surface 25 having a protrusion 55 formed on the back surface thereof, and an end portion of the outer peripheral edge of the disk portion is opposite to the facing surface 23. The ring-shaped flange portion 27 is formed by being bent perpendicularly to each other. Of course, the normal direction of the facing surface 23 coincides with the axial direction of the protrusion 55.
Of the six bolt holes 53 formed in the disk portion, three bolt holes have an inner diameter of about 40 mm, and a cylindrical hard rubber 59 having a metal circular tube inserted and fixed at the center is inserted into the bolt hole. Is done. The bolt is substantially passed through the metal circular tube, and the disk portion on the outer peripheral side of each bolt hole 53 into which the hard rubber 59 is inserted is erected in an annular shape with a thickness of about several millimeters. Yes. The other three bolt holes 53 have an inner diameter of about 15 mm, and the heads of the bolts come to the bottoms of the recesses formed in the rotary shaft surface 25. That is, the six bolts / nuts 51 that fix the two flanges opposed to each other are attached in a staggered manner so that the bolt heads come to the bottom of the recess and the nuts come to the hard rubber 59.
Here, a non-ring-shaped non-rotating washer 61 is fixed to the head portion of the bolt in order to prevent the inserted bolt from slipping.
The protrusion 55 is formed with an arc-shaped cutout along the bolt hole 53 for inserting the hard rubber 59. The projecting portion 55 is inserted into a concave hole (not shown) formed at the tip of the rotating shaft 14 of the prime mover indicated by the broken line and the rotating shaft 18 of the operating device indicated by the broken line, whereby the shaft coupling 26 is configured. The 22 and 24 flanges are attached to the tips of the rotary shafts 14 and 18, respectively. It should be noted that the axis of the rotating shaft 14 of the prime mover and the axis of the rotating shaft of the flange attached to the tip thereof completely coincide with each other, and the axis of the rotating shaft 18 of the operating device and the flange attached to the tip of the shaft. The axis of the rotary shaft is completely coincident with the axis.

  Hereinafter, in the case of connecting two shafts using the shaft joint 26 described above, the centering device for the shaft joint of the present invention used for centering (centering) the two shafts without relying only on experience and feeling is preferable. Embodiments will be described with reference to the drawings. Hereinafter, the flange attached to the tip of the rotary shaft 14 of the prime mover is referred to as a main flange 22, and the flange attached to the tip of the rotary shaft 18 of the operating device is referred to as a secondary flange 24.

  FIG. 3 is a conceptual diagram showing the overall configuration of the shaft coupling centering device 10 of this embodiment. The apparatus generally includes a vertical ranging sensor 32 for measuring the radial distance from the outer periphery of the main flange 22 and a horizontal ranging sensor 34 for measuring the axial distance from the outer periphery of the main flange 22. From the display device 38 (converter) that displays the radial distance and the axial distance measured by the vertical distance measuring sensor 32 and the horizontal distance measuring sensor 34, and from the change in the measured radial distance and axial distance, the prime mover A calculation display device 65 for calculating and displaying how the centering of the shaft coupling 26 can be achieved by adjusting the height, inclination and horizontal direction of the fixed seat 63 fixed to 12 and forming a leg; The sensor mounting jig 36 is fixed to the flange portion 27 on the outer peripheral edge of the slave flange 24 and holds the vertical distance measuring sensor 32 and the horizontal distance measuring sensor 34.

  The vertical distance measuring sensor 32 and the horizontal distance measuring sensor 34 are commercially available eddy current type sensors using a high-frequency magnetic field for precision distance measurement, and the outer shape thereof is a cylindrical shape having a diameter of about 1 cm. Measure the distance to the surface facing the non-contact. This sensor is for measuring a distance of several millimeters to several centimeters, and its measurement error is in units of microns.

  The display device 38 is a converter that receives the distances measured by the sensors 32 and 34 as sensor signals, processes them, and displays them as numerical values on the display screen.

  The calculation display device 65 is a notebook personal computer connected to the display device 38 or a dedicated processing device. The calculation display device 65 analyzes the digital signal transmitted from the display device 38 and executes the calculation, thereby fixing the fixed seat 63 fixed to the prime mover 12. The amount of adjustment of the height, inclination and horizontal direction of the image is obtained and displayed on the display screen. Of course, the display device 38 and the calculation display device 65 can be integrated.

As can be seen from FIG. 4 which is a perspective view showing only the sensor attachment jig and FIG. 5 which is a perspective view showing a state where the sensor attachment jig 36 is attached to the shaft coupling 26, the U-shaped clamp is provided. It comprises a portion 42 and an L-shaped sensor mounting portion 44 extending from one end of the clamp portion.
The clamp portion 42 is formed with a screw hole in which a screw groove for screwing the jig mounting bolt 67 is engraved on one of the opposing surfaces.
The L-shaped sensor mounting portion 44 that extends in the axial direction from one end surface of the clamp portion 42 on which the screw hole is formed and bends toward the rotating shaft side has a cylindrical sensor (vertical distance measuring device) on each orthogonal surface. A through hole 69 for inserting and fixing the sensor 32 and the horizontal distance measuring sensor 34) is formed.
The sensor attachment jig 36 is fixed by inserting the clamp portion 42 into the flange portion 27 of the secondary flange 24 and clamping the flange portion 27 with the jig attachment bolt 67. When the sensor mounting jig 36 is fixed to the slave flange 24, the sensor mounting portion 44 is disposed so as to be in non-contact with and surround the outer peripheral edge of the main flange 22.

  Next, a shaft coupling centering method using the shaft coupling centering device 10 described above will be described. The motor 12 is provided with a fixed seat 63 as a metal leg on the casing thereof by an integral casting or welding structure, and is mounted on a heavy base 71 using the fixed seat as a leg. On the other hand, the operating device 16 is placed and fixed on a heavy pedestal 71 in advance.

As a preparatory step, before attaching the sensor mounting jig 36 to the slave flange 24, the opposing surface 23 of the slave flange 24 and the opposing surface 23 of the main flange 22 are opposed to each other, and the rotation shafts 14 and 18 are roughly approximated. Centering of the shaft cores 14a and 18a is performed.
The facing surface 23 of the main flange 22 attached to the distal end portion of the rotating shaft 14 of the prime mover 12 faces the facing surface 23 of the slave flange 24 attached to the distal end portion of the rotating shaft 18 of the operating device 16 approximately in parallel. After adjusting the height and inclination of the prime mover 12 and the horizontal direction, the nut is loosely tightened through one of the six bolt holes 53 and the flanges 22 and 24 are connected by temporary fixing.

  Next, the clamp portion 42 of the sensor mounting jig 36 is inserted into the flange portion 27 of the slave flange 24, and the flange portion 27 is clamped by tightening the jig mounting bolt 67. To fix. It should be noted that the sensor mounting jig 36 is fixed to the slave flange 24 in such a manner that the extension direction does not have to coincide completely with the direction of the axis 18a of the slave flange 24, and there may be some errors. This is because the secondary flange 24 and the main flange 22 rotate integrally as described below.

  Subsequently, the main flange 22 and the sub-flange 24 are integrally pivoted so that the left and right flanges 22 and 24 that are opposed to each other by the rotation are not displaced in the horizontal plane of the fixed seat 63 on the base 71. Fine-tune the position and direction. This fine adjustment is performed, for example, by tapping the side surface of the fixed seat 63 with a mallet.

  After finely adjusting the position and direction of the fixed seat 63 on the pedestal 71 so that the left and right displacements of the flanges 22 and 24 are eliminated even if the main flange 22 and the slave flange 24 are integrally rotated, the sensor The vertical distance measuring sensor 32 and the horizontal distance measuring sensor 34 are fitted and fixed in the through holes 69 of the sensor mounting portion 44 of the mounting jig 36. Then, the main flange 22 and the secondary flange 24 are integrally pivoted, and the vertical distance measuring sensor 32 determines the distance from the outer peripheral edge of the flange in the vertical plane (more precisely, the outer peripheral surface of the flange portion 27 of the main flange 22). The horizontal distance measuring sensor 34 measures the distance from the outer peripheral edge of the flange in the horizontal plane (more precisely, the surface on the rotating shaft side of the flange portion 27 of the main flange 22). This measured value is displayed numerically on the display screen of the display device 38. Further, the change in distance measured by each sensor 32, 34 is displayed on the display screen of the calculation display device 65 as a sine curve (sine curve) or a composite curve thereof, and the calculation display device 65 analyzes the data, thereby driving the motor. The height and inclination of the fixed seat 63 fixed to 12 and the adjustment amount of the horizontal direction are obtained and displayed on the display screen.

  For example, in the perspective view shown in FIG. 3, the points a, b, c, and d are all low, in other words, the axis 14a of the rotating shaft 14 of the prime mover 12 is enlarged as shown in FIG. When the flanges 22 and 24 are axially rotated together when the rotary shaft 18 of the operating device 16 is at a low position in the same vertical plane as the axis 18a of the rotating shaft 18, the measured value of the vertical ranging sensor 32 is the sensor mounting While the jig 36 changes to be the largest when it is at the top dead center and the smallest when it is at the bottom dead center, the measurement value of the horizontal distance measuring sensor 34 is hardly changed. When there is such a relationship in the change of each distance measured by the sensor, a liner having a thickness obtained from the relational expression described in FIG. 6 is inserted under each of the points a to d of the fixed seat 63. Centering of the shaft cores 14a and 18a is performed.

  Further, for example, in the perspective view shown in FIG. 3, the points a and b are low, in other words, the shaft core 14a of the rotating shaft 14 of the prime mover 12 is the rotating shaft 18 of the operating device 16 as shown in FIG. When tilted within the same vertical plane (by -θ) with respect to the shaft core 18a, the measurement value of the vertical distance measuring sensor 32 when the two flanges 22 and 24 are integrally rotated is almost changed. On the other hand, the measurement value of the horizontal distance measuring sensor 34 changes so as to be the largest when the sensor mounting jig 36 is at the top dead center and the smallest when it is at the bottom dead center. When there is such a relationship between the changes in the distances measured by the sensors 32 and 34, a liner having a thickness obtained from the relational expression shown in FIG. 7 is sandwiched between points a and b of the fixed seat 63. By inserting, the shaft cores 14a and 18a are centered.

  Further, for example, in the perspective view shown in FIG. 3, the points c and d are low, in other words, as shown in an enlarged view in FIG. 8, the axis 14 a of the rotating shaft 14 of the prime mover 12 is the rotating shaft 18 of the operating device 16. When tilted in the same vertical plane (by + θ) with respect to the shaft core 18a, the measured value of the vertical distance measuring sensor 32 when the flanges 22 and 24 are integrally rotated is almost unchanged. On the other hand, the measurement value of the horizontal distance measuring sensor 34 changes so that it is the smallest when the sensor mounting jig 36 is at the top dead center and the largest when it is at the bottom dead center. When there is such a relationship between the changes in the distances measured by the sensors 32 and 34, a liner having a thickness obtained from the relational expression shown in FIG. 8 is sandwiched between points c and d of the fixed seat 63. By inserting, the shaft cores 14a and 18a are centered. In this case, to be exact, the center point of the main flange 22 at the tip of the rotary shaft 18 of the prime mover 12 is shifted from the axis 18a of the rotary shaft 18 of the operating device 16, but the shift is very small. It can be approximated as shown in the figure.

  In the actual centering operation, the axis 14a of the rotating shaft 14 of the prime mover 12 is at a low position in the same vertical plane with respect to the axis 18a of the rotating shaft 18 of the operating device 16, and is inclined. Though conceivable, a liner having a thickness to be sandwiched under each point of the fixed seat 63 can be selected by applying and adjusting the above-described adjustment method.

  Further, in the above method, the left and right displacements of the opposed flanges 22 and 24, that is, fine adjustment of the displacement of both flanges in the horizontal plane is performed without using the sensors 32 and 34. You may make it perform the fine adjustment based on the measured value measured by the sensor.

  As described above, according to the shaft coupling centering method and the shaft coupling centering device of the present invention, it is possible to perform centering (centering) of the two shafts of the shaft coupling without relying only on experience and feeling. . In the present invention, the amount of deviation and inclination of the two axes can be easily obtained. Therefore, the adjustment of the deviation and inclination of the two axes in the vertical plane, which is particularly difficult and requires a lot of labor, that is, a fixed seat. It is possible to easily determine which thickness of the liner needs to be inserted in which portion of the throat.

  It should be noted that the configuration of the present invention is not limited to that described above, and can be appropriately changed without departing from the spirit of the invention. For example, the sensor mounting jig can be fixed to the flange itself or the rotating shaft instead of being fixed to the flange portion of the flange. Of course, the sensor mounting jig can be fixed to the flange portion of the main flange, and the radial distance and the axial distance from the outer peripheral edge of the slave flange can be measured by both sensors.

It is the perspective view which showed an example of the shaft coupling with which the centering apparatus of this invention is applied. It is XX sectional drawing and a top view of the shaft coupling of FIG. It is the conceptual diagram which showed the whole structure of the centering apparatus of the shaft coupling of a present Example. It is a perspective view of the sensor mounting jig of a present Example. It is the side view which showed the state which attached the sensor attachment jig of the present Example to the shaft coupling. It is the side view which expanded and showed the shaft coupling which attached the sensor attachment jig. It is the side view which expanded and showed the shaft coupling which attached the sensor attachment jig. It is the side view which expanded and showed the shaft coupling which attached the sensor attachment jig.

Explanation of symbols

12 Motors 14, 18 Rotating shafts 14a, 18a Shaft core 16 Operating equipment 22 Main flange 23 Opposing surface 24 Sub flange 25 Rotating shaft surface 26 Shaft coupling 27 Hook 32 Vertical distance sensor 34 Horizontal distance sensor 36 Sensor mounting jig 38 Display device 42 Clamping portion 44 Sensor mounting portion 51 Bolt / nut 53 Bolt hole 55 Projection portion 59 Hard rubber 61 Non-turn washer 63 Fixed seat 65 Arithmetic display device 67 Jig mounting bolt 69 Through hole 71 Base

Claims (4)

A rotating shaft (14) of a motor (12) such as a motor and an engine and a rotating shaft (18) of an operating device (16) that operates using the rotational power of the motor are provided at the tip of the rotating shaft of the motor. A method of centering a shaft coupling when connecting a main flange (22) and a sub-flange (24) provided at the tip of a rotating shaft of an operating device by using a shaft coupling (26) structured to oppose each other. ,
When the main flange and the slave flange are integrally rotated in a state where the main flange and the slave flange are connected by temporary fixing, an axis between one point of the opposing surface (23) of the main flange and one point of the opposing surface of the slave flange facing this point By measuring the change in the relative distance in the direction and the relative distance in the radial direction, the misalignment between the axis (14a) of the rotating shaft of the prime mover and the axis (18a) of the rotating shaft of the operating device is calculated, and the value A method for centering a shaft coupling, characterized in that the orientation and position in the horizontal and vertical directions of the operating device or prime mover are adjusted based on the shaft. A rotating shaft (14) of a motor (12) such as a motor and an engine and a rotating shaft (18) of an operating device (16) that operates using the rotational power of the motor are provided at the tip of the rotating shaft of the motor. A shaft used for centering when the main flange (22) and the slave flange (24) provided at the tip of the rotary shaft of the operating device are connected to each other by using a shaft joint (26) structured to be fixed. A joint centering device,
A vertical distance measuring sensor (32) for measuring a radial distance from an outer peripheral edge of the main flange;
A horizontal distance measuring sensor (34) for measuring an axial distance from an outer peripheral edge of the main flange;
A sensor mounting jig (36) fixed to the outer peripheral edge of the slave flange and holding the vertical distance measuring sensor and the horizontal distance measuring sensor;
And a display device (38) for displaying the radial distance and the axial distance measured by the vertical distance measuring sensor and the horizontal distance measuring sensor. A rotating shaft (14) of a motor (12) such as a motor and an engine and a rotating shaft (18) of an operating device (16) that operates using the rotational power of the motor are provided at the tip of the rotating shaft of the motor. A shaft used for centering when the main flange (22) and the slave flange (24) provided at the tip of the rotary shaft of the operating device are connected to each other by using a shaft joint (26) structured to be fixed. A joint centering device,
A vertical distance measuring sensor (32) for measuring a radial distance from the outer peripheral edge of the slave flange;
A horizontal distance measuring sensor (34) for measuring an axial distance from the outer peripheral edge of the slave flange;
A sensor mounting jig (36) fixed to the outer peripheral edge of the main flange and holding the vertical distance measuring sensor and the horizontal distance measuring sensor;
And a display device (38) for displaying the radial distance and the axial distance measured by the vertical distance measuring sensor and the horizontal distance measuring sensor. The ends of the outer peripheral edges of the main flange (22) and the secondary flange (24) are bent at right angles to the opposite side of the opposing surface (23) to form a ring-shaped flange (27),
The sensor mounting jig (36) includes a clamp part (42) for gripping the collar part in the radial direction, and extends from the clamp part to connect the vertical distance measuring sensor (32) and the horizontal distance measuring sensor (34). The shaft coupling centering device according to claim 2 or 3, comprising an L-shaped sensor mounting portion (44) that is held in close proximity to the main flange in a non-contact manner.

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