JP7178779B2 - Positioning jig and positioning method - Google Patents

Description

The present invention relates to a positioning jig and a positioning method for positioning an object to be placed at a predetermined position separated from the surface of a predetermined member at the predetermined position.

Vertical shaft pumps are periodically checked for vibration of the main shaft of the impeller. To detect such vibrations of the main shaft, non-contact distance detectors for the main shaft, such as eddy current type, capacitance type, ultrasonic type, and laser type, are used.

Two distance detectors are then arranged around the main axis at an angle of approximately 90 degrees. Each distance detector is arranged in such a manner that one end is held by the other end of a clamp-type arm mechanism installed on a foundation or a frame around the main shaft. The magnitude of vibration of the spindle is calculated from changes in the distance to the surface of the spindle detected over time by both distance detectors.

The distance detector is located at a position where the center line of the sensor head is perpendicular to the axis of the main shaft and the distance between the surface of the main shaft and the sensor head is within the measurement range, for example, the measurement range is 0.5 to 5. If it is about 0.5 mm, it should be arranged at a position that is 1 to 5 mm, preferably 2 to 4 mm, and more preferably about 3 mm.

JP 2010-121467 A

However, although the distance detector needs to be placed in a predetermined posture at a position separated from the surface of the spindle by about 3 mm as described above, the surface of the spindle has a cylindrical shape. Accurate positioning of the detector required a great deal of skill and time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a positioning jig and a positioning method capable of quickly and accurately positioning an object at a predetermined position relative to a predetermined member without requiring skill. there is

To achieve the above object, the positioning jig according to the present invention is characterized by:
A positioning jig for positioning, at a predetermined position, an object to be placed at a predetermined position away from a surface having a curved surface of a predetermined member, which is a cylindrical rotating body rotatable about an axis ,
a fixing portion capable of detachably fixing the object; and a contact portion capable of coming into contact with the surface of the predetermined member;
When the object is fixed to the fixing portion, the fixing portion and the contact portion contact the surface of the predetermined member, thereby fixing the object to the predetermined position. is configured to be placed in position,
The contact portion is configured to contact the surface of the predetermined member while the movement of the predetermined member in at least one direction perpendicular to the direction in which the predetermined member contacts the surface is restricted. having contact planes in line contact with the surface along a direction parallel to the axis at positions spaced apart from each other in the circumferential direction of the
The fixing portion presses a support portion capable of supporting the object on at least one point on the surface of the object, and a portion of the surface of the object that is not supported by the support portion. a pressing means capable of holding the object between itself and the supporting portion, and capable of removing the positioning jig from the object by releasing the pressing force;
The supporting portion has the object such that a predetermined distance is secured between the predetermined member and the object when the contact portion is brought into contact with the surface of the predetermined member. The point is that the front surface of the predetermined member facing the surface can be supported in an abutting state.

According to the above-described configuration, since the fixed portion for positioning the object and the positioning jig and the abutment portion for positioning the positioning jig and the predetermined member are provided, the fixed portion When the contact portion of the positioning jig to which the object is fixed is brought into contact with the surface of the predetermined member, the object is quickly and accurately positioned at the predetermined position with respect to the predetermined member without requiring skill.
According to the above configuration, the posture of the object on the fixed portion can be stabilized by bringing the object into contact with the support portion of the fixed portion and pressing the object against the support portion by the pressing means. In addition, it is preferable that the support part is configured to be able to support at least one of the front facing the surface of the predetermined member of the object and the side surface connected to the front. Moreover, a screw and a spring can be exemplified as the pressing means.
According to the above-described configuration, when the support portion of the fixed portion supports the front surface of the object that faces the surface of the predetermined member, the positional relationship between the fixed portion and the contact portion is fixed. The distance from the front surface to the abutting portion is determined. When the abutment portion is brought into contact with the surface of the predetermined member in this state, the distance from the front surface of the object to the surface of the predetermined member is also determined.
According to the above configuration, the abutting portion can abut on the surface of the predetermined member, which is a cylindrical body of rotation, in an appropriate manner according to the shape of the predetermined member. A single positioning jig can be used to position a plurality of predetermined members with different shapes. It is no longer necessary to separately use a plurality of positioning jigs for each predetermined member.

In the present invention, it is preferable that the support portion is configured to contact the surface of the object by points, lines, planes, or a combination thereof.

According to the configuration described above, the support portion can contact the surface of the object in an appropriate manner according to the shape of the object.

In the present invention, the pressing means includes a female screw portion provided in the fixing portion and a pressing portion having a male screw portion that can be screwed into the female screw portion, and the pressing portion is attached to the support portion. By causing the object to be screwed in a direction approaching the supported object and bringing the tip portion into contact with the object, the object is sandwiched between the pressing portion and the support portion, and the pressing portion is held by the pressing portion. It is preferable that the holding of the object is released by screwing it away from the object and separating the tip portion from the object.

According to the above configuration, the pressing portion is screwed in a direction to approach the object, so that the tip portion of the pressing portion presses the object against the support portion, and the object is fixed by the fixing portion.

In the present invention, it is preferable that the object is a distance detector capable of measuring displacement of the surface of the rotating body in a rotating state.

According to the above configuration, the vibration of a cylindrical rotating body, for example, the main shaft of a vertical shaft pump, can be detected by the distance detector in a non-contact manner.

A feature of the positioning method according to the present invention for achieving the above object is a cylindrical body of rotation that can rotate around its axis using a positioning jig having any of the above-described feature configurations. A positioning method for positioning an object to be placed at a predetermined position away from a surface having a curved surface of a predetermined member at the predetermined position,
fixing the object at a fixing portion of the positioning jig;
The contact portion of the positioning jig, to which the object is fixed, is restricted from moving in at least one direction orthogonal to the direction in which it contacts the surface of the predetermined member. abut against the surface;
Positioning and fixing the object in the fixed part by a clamp arm fixed at a position spaced apart from the predetermined member;
releasing the fixation of the object at the fixation part;
The positioning jig can be removed without affecting the position of the object fixed by the clamp arm and the position of the predetermined member.

According to the above-described configuration, the object can be attached to the predetermined member by a simple operation of bringing the abutting portion of the positioning jig, to which the object is fixed to the fixing portion, into contact with the surface of the predetermined member. It can be quickly and accurately positioned at a predetermined position with respect to a predetermined member.

Explanatory drawing of a vertical shaft pump installed in a pump well Explanatory drawing of positioning of the distance detector using the positioning jig Explanatory drawing of positioning of the distance detector using the positioning jig Explanatory diagram of the distance detector Explanatory drawing of positioning of the distance detector using the positioning jig Explanatory drawing of positioning of the distance detector using the positioning jig Explanatory drawing of main part of positioning jig Explanatory drawing of positioning of a distance detector using a positioning jig according to another embodiment Explanatory drawing of positioning of a distance detector using a positioning jig according to another embodiment Explanatory drawing of positioning of a distance detector using a positioning jig according to another embodiment Explanatory drawing of a main part of a positioning jig according to another embodiment Explanatory drawing of positioning of a distance detector using a positioning jig according to another embodiment Explanatory drawing of positioning of a distance detector using a positioning jig according to another embodiment Explanatory drawing of positioning of a distance detector using a positioning jig according to another embodiment Explanatory drawing of positioning of a distance detector using a positioning jig according to another embodiment Explanatory drawing of positioning of a distance detector using a positioning jig according to another embodiment Explanatory drawing of positioning of a distance detector using a positioning jig according to another embodiment

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a vertical shaft pump 1 is for pumping up and discharging water from a pump well 2, and has a pump casing 4 having a suction port 3 and a pump casing 4 provided rotatably inside the pump casing 4. It includes a main shaft 5, an impeller 6 attached to the tip of the main shaft 5, a pumping pipe 7 connected to the downstream side of the pump casing 4, an electric motor 8 for rotating the main shaft 5, and the like.

An installation base 10 is installed on the floor 9 of the pump well 2 , and a frame 11 for mounting the electric motor 8 is installed on the installation base 10 . The main shaft 5 of the vertical shaft pump 1 and the output shaft 12 of the electric motor 8 are connected by a coupling 13 inside the frame 11 .

The rotation of the electric motor 8 causes the impeller 6 to rotate, and the water sucked into the pump casing 4 is pumped up to the water discharge pipe 7 and discharged to the discharge pipe 14 connected downstream of the water discharge pipe 7 .

As shown in FIGS. 2 and 3, the positioning jig 30 according to the present invention has two distance detectors 20 installed inside the pedestal 11 to check the vibration of the main shaft 5 of the vertical shaft pump 1 . A clamp arm 15 is used at two points around the circumference of the spindle 5 to position it at a predetermined position spaced from the surface.

The clamp arm 15 includes a magnet stand 16 and a plurality of arms 18 connected via joint mechanisms 17 . The joint mechanism 17 can fix the two arms 18 to be connected in an arbitrary posture. The arm 18 at the tip is equipped with a hand plate 19 that holds the distance detector 20 .

Next, the distance detector 20 will be briefly described. In this embodiment, an eddy current type distance detector 20 is used. The distance detector 20 has a metal sensor housing 21 and a resin sensor head 22 supported by the sensor housing 21, as shown in FIGS. Both the sensor housing 21 and the sensor head 22 have coaxial columnar shapes, but the sensor head 22 has a smaller diameter than the sensor housing 21 .

A cylindrical mounting portion 23 extends from the sensor housing 21 on the side opposite to the sensor head 22 , and two mounting nuts 24 are screwed onto male threads provided on the surface of the mounting portion 23 . The distance detector 20 is held on the clamp arm 15 by clamping the hand plate 19 of the clamp arm 15 with two mounting nuts 24 .

The sensor head 22 has a built-in sensor coil, and the sensor housing 21 has an oscillator circuit that supplies high-frequency signals to the sensor coil, a detector circuit that extracts changes in the distance between the sensor head 22 and the spindle 5 as voltage changes, and the like. is built-in. A coaxial cable 25 extends through the interior of the mounting portion 23 for supplying power to the driver and outputting voltage changes from the driver to the outside. Note that the distance detector 20 may incorporate only the sensor coil and the driver may be provided externally.

If the measurement range of the distance detector 20 is, for example, 0.5 to 5.5 mm, the surface is positioned within the measurement range even if the surface is shaken due to shaft vibration generated in the main shaft 5, which is the target of displacement detection. In order to do so, the sensor head 22 needs to be placed at a predetermined position about 1 to 5 mm, preferably 2 to 4 mm, more preferably 3 mm away from the surface of the main shaft 5 .

The perpendicularity of the distance detector 20 to the main shaft 5 is ±5° (see FIG. 2), and the mounting angle between the two distance detectors 20 is 90°±5° (see FIG. 3). , the displacement of the two distance detectors 20 along the axis of the main shaft 5 is preferably within a few millimeters (see FIG. 2). However, these numerical values change according to the diameter of the main shaft 5.

The positioning jig 30 is formed by cutting aluminum (for example, A5052) having a generally rectangular parallelepiped appearance, and as shown in FIG. and a contact portion 32 that can contact the surface of the main shaft 5 of the pump 1 . Since the fixed portion 31 and the contact portion 32 are integrally formed, the structure of the positioning jig 30 can be simplified, and the manufacturing is easy.

The fixing portion 31 includes a support portion 33 capable of supporting the distance detector 20 at a plurality of locations on the surface of the distance detector 20, and a portion of the surface of the distance detector 20 that is not supported by the support portion 33. and pressing means 34 capable of holding the distance detector 20 between itself and the support portion 33 by pressing the distance detector 20 .

When viewed from the front surface 30a and the top surface 30b of the positioning jig 30, the support portion 33 is composed of a U-shaped notch that opens toward the top surface 30b side and the front surface 30a side. 33b, 33c and 33d. The distance between the side surface 33b and the side surface 33d is set longer than the diameter of the sensor housing 21. As shown in FIG. At that time, the distance between the center of the positioning jig 30 in the width direction and the side surface 33d is configured to be the same as the radius of the sensor housing 21, and the distance between the center of the width direction of the positioning jig 30 and the side surface 33b is the sensor. It is configured to be wider than the radius of the housing 21 (see FIG. 5).

As shown in FIGS. 5 to 7 , when fixing the distance detector 20 to the fixing portion 31 , the distance detector 20 is arranged such that the peripheral surface of the sensor housing 21 is aligned with the bottom surface of the support portion 33 along the axis of the sensor head 22 . The sensor head 22 is in surface contact with the side surface 33c of the support portion 33, while the sensor head 22 is in line contact with the side surface 33a and the side surface 33d.

That is, the support portion 33 is provided on the front surface of the distance detector 20 facing the surface of the main shaft 5, the sensor head 22 in this embodiment, or the side surface connected to the front surface, or the peripheral surface of the sensor housing 21 in this embodiment. configured to be accessible.

The pressing means 34 includes a female screw portion 35 provided perpendicular to the side surface 33b of the support portion 33 and at a position higher than the axis of the sensor head 22 of the distance detector 20 supported by the support portion 33; A bolt 37 as a pressing portion having a male screw portion 36 that can be screwed onto the screw portion 35 is provided. The female threaded portion 35 and the male threaded portion 36 are formed of right-handed screws.

The bolt 37 is a hexagon socket head bolt, and its tip portion 38 is chamfered so that the tip angle is about 60 degrees.

It should be noted that the male threaded portion 36 needs to have an appropriate length so that it can be screwed with respect to the female threaded portion 35 and the distal end portion 38 can protrude from the side surface 33b toward the side surface 33d.

As shown in FIGS. 5 and 7, the bolt 37 is screwed in a direction approaching the distance detector 20 supported by the support portion 33, and the tip portion 38 is brought into contact with the sensor housing 21 of the distance detector 20. As a result, the distance detector 20 is clamped at three points, ie, the tip portion 38 of the bolt 37 and the bottom surface 33a and side surface 33d of the support portion 33. As shown in FIG.

When the distance detector 20 is sandwiched between the bolt 37 and the support portion 33, since the female screw portion 35 and the male screw portion 36 are configured with right-handed screws, when the bolt 37 is screwed, the bolt 37 is screwed. The tip portion 38 contacts the sensor housing 21 of the distance detector 20 so that the front surface of the sensor head 22 is pressed against the side surface 33c of the fixed portion 31 (see FIG. 6).

Therefore, when the bolt 37 is screwed, the peripheral surface of the sensor housing 21 is in line contact with the bottom surface 33a and the side surface 33d of the support portion 33 in the fixed portion 31 of the distance detector 20, and the front surface of the sensor head 22 is in contact with the side surface 33c. It is supported at a predetermined position for surface contact. Thereby, the distance from the front surface of the distance detector 20 to the contact portion 32 is determined.

In this manner, the distance detector 20 is brought into contact with the support portion 33 of the fixed portion 31, and the distance detector 20 is pressed against the support portion 33 by the pressing means 34, whereby the fixed portion 31 of the distance detector 20 is moved. It can stabilize the posture in

On the other hand, by screwing the bolt 37 away from the distance detector 20 to separate the tip portion 38 from the distance detector 20, the clamping of the distance detector 20 is released.

As shown in FIGS. 3 to 5, the contact portion 32 includes a pair of protruding portions 39 forming a U-shaped notch opening toward the rear surface 30f when viewed from the top surface 30b of the positioning jig 30. has 40.

The projecting portions 39 and 40 are chamfered at opposing corners from the top surface 30b to the bottom surface 30d to form inclined surfaces 39a and 40a. Therefore, the surface of the main shaft 5 is in line contact with the inclined surfaces 39a and 40a of the projecting portions 39 and 40 along the axis of the main shaft 5, respectively.

Even if the diameter of the main shaft 5 is large or small, the positioning jig 30 can position the distance detector 20 as long as the surface of the main shaft 5 is in line contact with the inclined surfaces 39a and 40a of the projections 39 and 40, respectively. is.

When the contact portion 32 of the positioning jig 30 is in contact with the surface of the main shaft 5, the distance from the surface of the main shaft 5 to the sensor head 22 is a predetermined distance. The projecting length of projecting portions 39 and 40 from the rear surface 30f and the inclination of the inclined surfaces 39a and 40a are designed to be about 1 to 5 mm, preferably about 2 to 4 mm, and more preferably about 3 mm.

Further, the centers of the projecting portions 39 and 40 and the center of the sensor head 22 fixed at the fixing portion 31 are configured to match (see FIG. 5).

With the above configuration, when the contact portion 32 of the positioning jig 30 to which the distance detector 20 is fixed to the fixing portion 31 is brought into contact with the surface of the main shaft 5 , the distance detector 20 moves the sensor head 22 toward the main shaft 5 . A predetermined position directly facing the surface, that is, the distance detector 20 is perpendicular to the main shaft 5 within ±5°, and is positioned at a predetermined position separated from the surface of the main shaft 5 by 1 to 5 mm, preferably 2 to 4 mm, more preferably about 3 mm. is positioned at

By fixing the arm 18 with each joint mechanism 17 of the clamp arm 15 in this state, the distance detector 20 is held at a predetermined position (see FIG. 2). Then, by screwing the bolt 37 away from the distance detector 20 to separate the tip portion 38 from the distance detector 20, the clamping of the distance detector 20 is released, and the positioning jig 30 can be removed. can.

Specifically, the distance detector 20 is fixed at the fixing portion 31 of the positioning jig 30, and the contact portion 32 of the positioning jig 30 to which the distance detector 20 is fixed is brought into contact with the surface of the spindle 5, The fixing of the distance detector 20 in the fixed part 31 is released, and the positioning jig 30 is removed downward without affecting the position of the distance detector 20. A positioning method for positioning the target distance detector 20 at a predetermined position is realized.

As described above, the distance detector 20 can be moved to a predetermined distance relative to the main shaft 5 by a simple operation of bringing the abutting portion 32 of the positioning jig 30 to which the distance detector 20 is fixed to the fixed portion 31 into contact with the surface of the main shaft 5 . Since it is positioned at the position, quick and accurate positioning is possible without requiring skill.

In the above-described embodiment, the distance detector 20 is such that the peripheral surface of the sensor housing 21 is in line contact with the bottom surface 33a and the side surface 33d of the support portion 33 along the axis of the sensor head 22, and the sensor head 22 is aligned with the support portion. Although the structure which surface-contacts with the side surface 33c of 33 was demonstrated, it does not restrict to this. For example, projections may be provided on the two side surfaces 33c and 33d and the bottom surface 33a of the support portion 33, and the sensor housing 21 and the sensor head 22 may be in point contact with these projections. Further, the shape of the bottom surface 33a and the side surface 33d of the support portion 33 is made to correspond to the shape of the peripheral surface of the sensor housing 21, so that the peripheral surface of the sensor housing 21 is in surface contact with the bottom surface 33a and the side surface 33d. good too.

In the above-described embodiment, the case where the support portion 33 has the side surface 33c has been described, but the present invention is not limited to this. The support portion 33 may not have the side surface 33c, and the distance from the surface of the main shaft 5 of the distance detector 20 may be manually adjusted when the bolt 37 is held. At that time, a spacer 41 may be used between the surface of the spindle 5 and the sensor head 22 as shown in FIG.

In the above-described embodiment, the positioning jig 30 has one bottom surface 33a and three Although the case where the support portion 33 having the side surfaces 33b, 33c, and 33d is provided has been described, the present invention is not limited to this. As shown in FIGS. 9 to 11, the support portion 33 has a U-shape opening toward the front surface 30a when viewed from the top surface 30b of the positioning jig 30, but when viewed from the front surface 30a, the top surface The V-shaped cutout opening on the 30b side may be provided with a support portion 42 having one side surface 42a and two inclined bottom surfaces 42b and 42c.

In this case, the pressing means may be composed of a bolt mechanism 43 that presses the sensor housing 21 of the distance detector 20 vertically downward from directly above. The bolt mechanism 43 is composed of a bolt 43a that abuts on the sensor housing 21 and a plate 43b that can be screwed into the bolt 43a and that is detachably attached to the support portion 33. As shown in FIG.

In the above-described embodiment, a bolt is used as the pressing means 34, but the present invention is not limited to this. An urging means such as a leaf spring may be used as the pressing means 34 .

In the embodiment described above, the case where the contact portion 32 is in line contact with the surface of the main shaft 5 at the inclined surfaces 39a and 40a has been described, but the present invention is not limited to this. The contact portion 32 may be in surface contact with the surface of the main shaft 5, that is, may be configured to contact by curved surfaces 39b and 40b along the surface of the main shaft 5 as shown in FIG. and may be in point contact, i.e., provided to contact by means of sharp-tipped projections 39c, 40c, as shown in FIG. 13, or rounded-tipped, as shown in FIG. Contact may be provided by protrusions 39d, 40d. It may also be configured to contact by a combination of these points, lines or surfaces.

In the embodiment described above, the case where the object positioned by the positioning jig 30 is the distance detector 20 that detects the vibration displacement of the main shaft 5 of the vertical shaft pump 1 has been described, but the object is not limited to this. The target object is, for example, a detector that detects a predetermined member flowing on a belt conveyor without contact, measurement and monitoring of reciprocating fluctuation, measurement and monitoring of metal displacement, positioning of the table of the processing machine, distortion and parallelism of the chassis. or a detector that detects the rotation of the gear.

In the above-described embodiment, the case where the predetermined member is the main shaft 5 of the vertical shaft pump 1 has been described, but the present invention is not limited to this. For example, as shown in FIG. 15, the predetermined member may be a prismatic member 50 . In this case, the positioning jig 60 may be provided with a contact portion 61 having flat surfaces 61a and 61b that are in surface contact with two surfaces sandwiching one edge of the member 50, respectively. Regarding the positioning jig 60, the same reference numerals are given to the same components as those of the positioning jig 30 described above, and the description thereof will be omitted.

Alternatively, as shown in FIG. 16, the predetermined member may be a member 51 having an L-shaped cross section. In this case, the positioning jig 62 may be provided with a contact portion 63 having flat surfaces 63a and 63b that are in surface contact with two surfaces sandwiching one edge of the member 51, respectively. Regarding the positioning jig 62, the same reference numerals are given to the same components as those of the positioning jig 30 described above, and the description thereof will be omitted.

Alternatively, the predetermined member may be a spherical member 52, as shown in FIG. In this case, the positioning jig 64 may be provided with a contact portion 65 having protrusions 65a, 65b, and 65c that make point contact with the surface of the member 52, respectively. Regarding the positioning jig 64, the same reference numerals are given to the same components as those of the positioning jig 30 described above, and the description thereof will be omitted.

In the above-described embodiment, the positioning jig 30 is made of aluminum, but the material of the positioning jig 30 is not limited to aluminum. The material is preferably a material that is moderately strong and light, and may be other metals or resins.

Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description, and the specific configuration of each part can be appropriately changed and designed within the scope of the effects of the present invention. .

5: Spindle (predetermined member)
20: distance detector (object)
30: positioning jig 31: fixed portion 32: contact portion 33: support portion 34: pressing means 35: female screw portion 36: male screw portion 37: bolt (pressing portion)
38: tip part C: shaft center

Claims (5)

A positioning jig for positioning, at a predetermined position, an object to be placed at a predetermined position away from a surface having a curved surface of a predetermined member, which is a cylindrical rotating body rotatable about an axis ,
a fixing part capable of detachably fixing the object;
a contact portion capable of contacting the surface of the predetermined member,
When the object is fixed to the fixing portion, the fixing portion and the contact portion contact the surface of the predetermined member, thereby fixing the object to the predetermined position. is configured to be placed in position,
The contact portion is configured to contact the surface of the predetermined member while the movement of the predetermined member in at least one direction perpendicular to the direction in which the predetermined member contacts the surface is restricted. having contact planes in line contact with the surface along a direction parallel to the axis at positions spaced apart from each other in the circumferential direction of the
The fixing portion presses a support portion capable of supporting the object on at least one point on the surface of the object, and a portion of the surface of the object that is not supported by the support portion. a pressing means capable of holding the object between itself and the supporting portion, and capable of removing the positioning jig from the object by releasing the pressing force;
The supporting portion has the object such that a predetermined distance is secured between the predetermined member and the object when the contact portion is brought into contact with the surface of the predetermined member. A positioning jig, wherein the front surface of the predetermined member facing the surface can be supported in an abutting state. 2. The positioning jig according to claim 1 , wherein the support portion is configured to contact the surface of the object by points, lines, planes, or a combination thereof. The pressing means includes a female screw portion provided in the fixing portion and a pressing portion having a male screw portion that can be screwed into the female screw portion,
By screwing the pressing portion in a direction approaching the object supported by the supporting portion and bringing the tip portion thereof into contact with the object, the object is moved by the pressing portion and the supporting portion. sandwiched,
3. The clamping of the object is released by screwing the pressing portion away from the object to separate the tip portion from the object. A positioning jig as described. 4. The positioning jig according to any one of claims 1 to 3 , wherein the object is a distance detector capable of measuring displacement of the surface of the rotating body in a rotating state. Using the positioning jig according to any one of claims 1 to 4 , a predetermined member, which is a cylindrical body of rotation rotatable about its axis, is placed at a predetermined position away from the surface having a curved surface. A positioning method for positioning an object to be positioned at the predetermined position,
fixing the object at a fixing portion of the positioning jig;
The contact portion of the positioning jig, to which the object is fixed, is restricted from moving in at least one direction orthogonal to the direction in which it contacts the surface of the predetermined member. abut against the surface;
Positioning and fixing the object in the fixed part by a clamp arm fixed at a position spaced apart from the predetermined member;
releasing the fixation of the object at the fixation part;
A positioning method, wherein the positioning jig is removed without affecting the position of the object fixed by the clamp arm and the position of the predetermined member.

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