JP2011107044A - External diameter measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external diameter measuring device precisely measuring the outer diameter of an object to be measured while the object is still. <P>SOLUTION: In the outer diameter measuring device, a pair of photoirradiation parts 1 is provided on a photoirradiation base B so that mutual interval can be changed freely by an interval changing part A while applying laser beams in parallel mutually in a direction orthogonal to an arrangement direction of the pair of photoirradiation parts 1, a photoirradiation interval measurement part C for measuring a photoirradiation interval of the pair of photoirradiation part 1 changed by the interval changing part A or a dimension which can obtain the photoirradiation interval is provided on the photoirradiation base B, and a photoirradiation bases arrangement part D for disposing the photoirradiation base B along the outer periphery of the object W to be measured is provided while orthogonally crossing the object W to be measured in the radial direction in the middle of the pair of photoirradiation part 1 in a state where the arrangement direction of the pair of photoirradiation part 1 is in parallel with the peripheral direction of the object W to be measured and respective laser photoirradiation directions of the pair of photoirradiation part 1 become parallel with the object W to be measured in the radial direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an outer diameter measuring device that measures the outer diameter of a measurement object having a circular outer cross-sectional shape.

Such an outer diameter measuring device measures the outer diameter of an object to be measured having a circular outer cross-sectional shape, and a specific example of the object to be measured is a cylindrical pipe member such as a water pipe. .
As a conventional example of such an outer diameter measuring device, a pair of rollers for rotating the object to be measured about its axis, and a laser beam irradiated to the object to be measured rotated by the pair of rollers, the Doppler A laser Doppler velocimeter that measures the rotation speed of the object to be measured by a signal and a rotation sensor that measures the time required for one rotation of the object to be measured are provided. From the measurement results of the laser Doppler velocimeter and the rotation sensor, respectively. There is one that measures the outer diameter of an object to be measured (for example, see Patent Document 1).
That is, the outer diameter measuring device described in Patent Document 1 measures the outer diameter of the object to be measured while rotating the object to be measured around its axis.

Further, as another conventional example of such an outer diameter measuring device, at least three points on one side of the outer peripheral surface of the object to be measured in a plane perpendicular to the axis of the object to be measured are set as boundaries. Measuring means for measuring the position, and numerical calculation means for calculating the center point of the object to be measured from the positions of these at least three points and calculating the outer diameter of the object to be measured from the positions of the center point and at least three points. Some were provided (for example, refer to Patent Document 2).
That is, the outer diameter measuring device described in Patent Document 2 can measure the outer diameter of the measurement object while the measurement object is stationary.

JP 2000-180129 A JP 2004-45206 A

By the way, as an object to be measured for an outer diameter by such an outer diameter measuring device, an object that cannot be rotated around an axis (for example, a water pipe buried in the ground) In some cases, an outer diameter measuring device that can measure the outer diameter of the measurement object while the measurement object is stationary may be desired.
However, the outer diameter measuring device disclosed in Patent Document 1 cannot be used in applications in which the outer diameter of the measurement object is measured while the measurement object is stationary.
On the other hand, in the outer diameter measuring apparatus of Patent Document 2 described above, the outer diameter of the object to be measured can be measured while the object to be measured is stationary, but there are problems as described below.
That is, a part of the outer peripheral surface of the object to be measured is deformed into a concave shape or a convex shape, and a part of at least three points whose positions are measured by the measuring means is a part where the shape of the outer peripheral surface is deformed. If they match, all of at least three points whose positions are measured by the measuring means are not on the same circle centered on the axis of the object to be measured. Therefore, the outer diameter of the object to be measured is calculated based on the positions of at least three points that are not all on the same circle centered on the axis of the object to be measured. The diameter cannot be measured with high accuracy.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an outer diameter measuring device capable of accurately measuring the outer diameter of the object to be measured while the object to be measured is stationary. .

The outer diameter measuring device of the present invention is an outer diameter measuring device that measures the outer diameter of a measurement object having a circular outer cross-sectional shape,
The first characteristic configuration is that the pair of light irradiation units emit laser beams in parallel to each other in a direction orthogonal to the arrangement direction of the pair of light irradiation units, and the interval changing unit can freely change the interval between them. Provided on the irradiation stand,
A light irradiation interval measuring unit for measuring a light irradiation interval of the pair of light irradiation units changed by the interval changing unit or a dimension capable of obtaining the light irradiation interval is provided in the light irradiation table;
The alignment direction of the pair of light irradiation units is parallel to the circumferential direction of the measurement object, and is orthogonal to the radial direction of the measurement object in the middle of the pair of light irradiation units, and each of the pair of light irradiation units. The light irradiation stand arrangement part arrange | positions the said light irradiation stand along the outer peripheral part of the said to-be-measured object in the state which becomes parallel to the radial direction of the said to-be-measured object.

That is, the light irradiation table arrangement unit causes the pair of light irradiation units to be arranged in a state in which the arrangement direction of the pair of light irradiation units (hereinafter sometimes referred to as the light irradiation unit arrangement direction) is parallel to the circumferential direction of the measurement object. The outer periphery of the object to be measured in a stationary state so that the laser light irradiation direction of each of the pair of light irradiation units is in parallel with the diameter direction of the object to be measured. Placed in the section.
When the light irradiation table is arranged in this way, the interval changing unit is arranged such that the pair of light irradiation units are distributed outside the portion corresponding to the diameter parallel to the light irradiation unit arrangement direction on the outer peripheral surface of the measurement object. The distance between the pair of light irradiating units and the distance between the pair of light irradiating units disposed inside the portion corresponding to the diameter parallel to the light irradiating unit alignment direction on the outer peripheral surface of the object to be measured. The interval can be changed.

Then, by the interval changing unit, the laser light irradiated from each of the pair of light irradiation units moves from the outside to the inside of the portion corresponding to the diameter parallel to the light irradiation unit arrangement direction on the outer peripheral surface of the measurement object. By changing the light irradiation interval so that the entire laser light is blocked by the outer peripheral surface of the object to be measured, or each laser light is parallel to the light irradiation part arrangement direction on the outer peripheral surface of the object to be measured The light irradiation interval is adjusted to a position at the moment of starting to hit a portion corresponding to a large diameter.
Alternatively, the interval changing unit causes the laser light emitted from each of the pair of light irradiation units to move from the inside to the outside of the portion corresponding to the diameter parallel to the light irradiation unit arrangement direction on the outer peripheral surface of the measurement object. By changing the light irradiation interval as described above, the position of the laser beam as a whole is moved away from the part corresponding to the diameter parallel to the light irradiation part arrangement direction on the outer peripheral surface of the object to be measured, or the moving direction of each laser light The light irradiation interval is adjusted to a position at the moment when the tip protrudes from the portion corresponding to the diameter parallel to the light irradiation portion arrangement direction on the outer peripheral surface of the object to be measured.
Since the light irradiation interval adjusted as described above corresponds to the outer diameter of the object to be measured, the light irradiation interval is measured by the light irradiation interval measuring unit, and the measured value is measured on the object to be measured. The outer diameter. Or the dimension which can obtain | require this light irradiation interval is measured in a light irradiation interval measurement part, light irradiation interval is calculated | required by the measured value, and the calculated | required value is made into the outer diameter of a to-be-measured object.

Moreover, when the light irradiation interval is adjusted as described above, even if the portion that the laser beam hits on the outer peripheral surface of the object to be measured is deformed, for example, the entire laser beam is measured according to the deformation. The position of the light irradiation part at the moment when it is blocked by the outer peripheral surface of the sensor and the position of the light irradiation part at the moment when the laser beam starts to hit the outer peripheral surface of the object to be measured change. The diameter can be measured.
Therefore, for example, even if the object to be measured is embedded in the ground and cannot be rotated, and the outer periphery of the object to be measured is deformed into a convex shape or a concave shape, The outer diameter of an object can be measured with high accuracy while the object to be measured is stationary.

In addition to the first feature configuration, the second feature configuration is
In the outer periphery of the object to be measured, the light irradiation table and the object to be measured are disposed at positions facing the measurement object on the object to be measured in the laser light irradiation direction and receive laser light emitted from each light irradiation part. It is in the point provided with a pair of to-be-irradiated bodies which have a light-receiving surface.

That is, the light irradiation unit is located at a position where the entire laser beam passes outside the portion corresponding to the diameter parallel to the light irradiation unit arrangement direction on the outer peripheral surface of the measurement object (that is, the measurement point). In this state, the entire laser beam emitted from the light irradiation unit hits the light receiving surface of the irradiated object.
In addition, when the light irradiation part is located at a position where a part of the laser light passes outside the part corresponding to the diameter parallel to the light irradiation part arrangement direction on the outer peripheral surface of the object to be measured, light irradiation is performed. Part of the laser light emitted from the portion hits the light receiving surface of the irradiated object.
In addition, in the state where the light irradiation unit is located at a position where the entire laser beam passes through the inside of the portion corresponding to the diameter parallel to the light irradiation unit arrangement direction on the outer peripheral surface of the object to be measured, the light irradiation unit The laser light emitted from the laser beam does not hit the light receiving surface of the irradiated object at all.
Then, while observing the contact state of the laser beam against the light receiving surface of such an object to be irradiated, the light irradiation interval can be adjusted by the interval changing unit, for example, the entire laser beam is the outer periphery of the object to be measured. It is easy to accurately identify the moment when the surface is interrupted or the moment when the laser beam starts to hit the outer peripheral surface of the object to be measured.
Therefore, the outer diameter measurement of the object to be measured can be facilitated.

In addition to the first or second feature configuration, the third feature configuration is
The said light irradiation stand arrangement | positioning part exists in the point comprised so that change of the arrangement position of the said light irradiation stand in the circumferential direction of the said to-be-measured object is possible.

That is, the light irradiation table arrangement part can change the arrangement position of the light irradiation table in the circumferential direction along the outer peripheral part of the measurement object, so that the location where the outer diameter of the measurement object is measured is It can be appropriately changed in the circumferential direction.
Therefore, it is possible to measure the outer diameter of the object to be measured in a direction along each of a plurality of different diameters, and to deform the outer peripheral portion of the object to be measured using the measured values of the plurality of outer diameters. Therefore, the outer diameter measuring device can be made even more useful.

In addition to the third feature configuration, the fourth feature configuration is
The light irradiation stand arrangement part is
An arcuate frame having an inner diameter larger than the outer diameter of the object to be measured;
A frame fixing portion for fixing the arc-shaped frame to the outer peripheral portion of the measurement object in a state of being spaced from the outer peripheral surface of the measurement object;
A mounting base fixed to the arcuate frame so that the fixing position in the longitudinal direction of the arcuate frame can be freely changed by the base fixing part;
The said light irradiation stand exists in the point attached to the said mounting base.

In other words, when there is an obstacle around the object to be measured, or when the object to be measured is buried in the ground, a space for measuring the outer diameter is secured all around the object to be measured. Even if this is difficult, by providing a space for arranging the arc-shaped frame in a part of the outer circumference of the object to be measured, the arc-shaped frame is fixed to the outer periphery of the object to be measured by the frame fixing part. Can be arranged. Incidentally, since the inner diameter of the arc-shaped frame (that is, the diameter of a circle including the inner circumference of the arc-shaped frame as a part of the circumference) is set larger than the outer diameter of the object to be measured, The frame is concentric with the object to be measured (the center of the arc-shaped frame (corresponding to the center of a circle including the inner periphery of the arc-shaped frame as a part of the circumference) ) Is concentric or substantially concentric with the center of the circular object to be measured.
Then, when the mounting base is fixed to the arc-shaped frame by the base fixing portion and the light irradiation base is attached to the mounting base, the outer diameter of the object to be measured can be measured. In addition, before attaching a mounting base to an arcuate frame, a light irradiation stand can be attached to an attachment base, and the mounting base which attached the light irradiation base in that way can also be attached to an arcuate frame.
In addition, since the base fixing portion can freely change the fixing position of the mounting base in the longitudinal direction of the arc-shaped frame, the arrangement position of the light irradiation base in the circumferential direction on the outer peripheral portion of the measurement object can be changed. Therefore, it is possible to measure the outer diameter of the object to be measured in a direction along each of a plurality of diameters having different directions.
Therefore, even when it is difficult to secure a space for measuring the outer diameter over the entire circumference of the object to be measured, the outer diameter measuring operation can be simplified.

In addition to the fourth feature configuration, the fifth feature configuration includes:
The arcuate frame is arcuate with a central angle greater than 180 °;
The frame fixing portion can apply a force for pressing the tip to the outer peripheral surface of the object to be measured at a plurality of positions in the longitudinal direction of the arc-shaped frame including at least two positions separated by 180 ° or more at the central angle. It is in the point comprised by the some press body provided in the said circular arc frame in the state.

In other words, in a state where an arc-shaped frame having a central angle larger than 180 ° is arranged on the outer peripheral portion of the object to be measured, it is provided at a plurality of positions in the longitudinal direction of the arc-shaped frame including at least two locations separated by 180 ° or more at the central angle. Each of the plurality of pressing bodies is made to act so that the tip of each of the pressing bodies is pressed against the outer peripheral surface of the object to be measured, so that the arc-shaped frame is attached to the outer surface of the object to be measured without performing any treatment. The outer peripheral portion can be fixed and arranged concentrically with the object to be measured.
Therefore, the outer diameter measuring operation can be further simplified.

Moreover, since the arcuate frame has an arcuate shape with a central angle larger than 180 °, the arrangement position of the light irradiation table can be changed in the outer peripheral portion of the object to be measured over a range of 180 ° or more at the central angle. it can.
This makes it possible to change the location where the outer diameter of the object to be measured is changed over the entire circumference of the object to be measured, so the outer diameter of the object to be measured can be changed over the entire circumference of the object to be measured. Of course, it is also possible to determine the deformation of the object to be measured.

In addition to the third feature configuration, the sixth feature configuration is
The light irradiation stand arrangement part is
A chain that can be tightened and loosened by a tightening portion while being wound around the outer peripheral portion of the object to be measured;
Comprising a mounting base attached to the chain,
The said light irradiation stand exists in the point attached to the said mounting base.

That is, the chain can be tightened and loosened by the tightening portion while the chain is wound around the outer peripheral portion of the object to be measured. It can be tightened to the outer periphery of the object to be measured.
Then, the chain wound around the outer periphery of the object to be measured with the mounting base attached is turned in the circumferential direction so that the mounting base is located at a predetermined position in the circumferential direction, and tightened by the fastening part. The mounting base can be fixed at an arbitrary position in the circumferential direction of the outer periphery of the object to be measured, and the fixing position can be easily and finely changed.
Then, by attaching the light irradiation stand to the attachment portion fixed at a predetermined position on the outer periphery of the object to be measured, the light irradiation table is arranged at a predetermined position on the outer periphery of the object to be measured, and the outer diameter of the object to be measured is It can be measured. In addition, the arrangement position of the light irradiation table in the outer peripheral part of the measurement object can be changed by turning the chain in the circumferential direction of the measurement object with the light irradiation table attached to the mounting table.
That is, the outer diameter of the measurement object can be measured while finely changing the arrangement position of the light irradiation table in the outer peripheral portion of the measurement object along the circumferential direction of the measurement object.
Therefore, it is possible to measure the outer diameters of a plurality of locations in the circumferential direction of the measurement object, and it is possible to more accurately determine the deformation of the outer peripheral portion of the measurement object based on those measurement values. The outer diameter measuring device can be made more useful.

In addition to any one of the first to sixth feature configurations described above, the seventh feature configuration is
The interval changing unit is configured to change the light irradiation interval by moving the pair of light irradiation units separately along their arrangement direction.

That is, since the pair of light irradiation parts can be moved individually along the arrangement direction thereof, for example, the laser beam of the portion corresponding to the diameter parallel to the light irradiation part arrangement direction on the outer peripheral surface of the object to be measured When moving each light irradiation unit so that it moves from the outside to the inside, the position of each light irradiation unit, the position at the moment when the entire laser beam is blocked by the outer peripheral surface of the object to be measured, and each laser It is possible to easily perform an operation for adjusting the position at the moment when the light starts to hit the portion corresponding to the diameter parallel to the light irradiation portion arrangement direction on the outer peripheral surface of the object to be measured. Moreover, the alignment of each light irradiation unit can be performed with high accuracy.
Therefore, it is possible to further simplify the outer diameter measurement work of the object to be measured, and to further improve the measurement accuracy of the outer diameter.

In addition to the seventh feature configuration, the eighth feature configuration is
A pair of holders holding the pair of light irradiation units are supported by the light irradiation table so as to be movable separately along the direction in which the pair of light irradiation units are arranged,
The interval changing unit is configured to change the light irradiation interval by moving the pair of holders along the alignment direction of the pair of light irradiation units,
The light irradiation interval measurement unit is configured to measure a distance between a reference position in the arrangement direction of the pair of light irradiation units and each holder as a dimension capable of obtaining the light irradiation interval. It is in.

That is, the pair of holders holding the pair of light irradiators by the interval changing unit are individually separated from the outside corresponding to the diameter parallel to the light irradiator alignment direction on the outer peripheral surface of the object to be measured. Move the position of each light irradiation unit to the position at the moment when the entire laser light is blocked by the outer peripheral surface of the object to be measured, or in the direction of the light irradiation unit alignment on the outer peripheral surface of the object to be measured It is adjusted to the position of the moment when it starts to hit the part corresponding to the parallel diameter.
Then, in this state, the light irradiation interval measuring unit determines the interval between the reference position in the light irradiation unit arrangement direction and a predetermined measurement point in each holder (hereinafter, referred to as a reference position-holder dimension). Measure separately.
Here, for example, when the reference position is provided corresponding to each of the pair of holders, the distance between the reference positions corresponding to each of the pair of holders in the light irradiation unit alignment direction (hereinafter referred to as a dimension between the reference positions). Is a fixed value, and can be measured in advance.
In addition, the distance in the direction in which the light irradiation units are arranged between a predetermined measurement point of one holder and the light irradiation unit held by the holder (hereinafter, sometimes referred to as a dimension between the holder and the light irradiation unit). Is a fixed value, and the dimension between the holder and the light irradiation part corresponding to the other holder is also a fixed value, and can be measured in advance.

And when a reference position, a holder, and a light irradiation part are located in a line from the center in the light irradiation part arrangement direction in a light irradiation stand toward an end, it corresponds to each of a pair of holders measured by the light irradiation interval measurement part. The value obtained by adding the dimension between the reference position and the dimension between the holder and the light irradiation part corresponding to each of the pair of holders to the dimension between the reference position and the holder corresponds to the light irradiation interval. The dimension between the reference position and the holder corresponding to is a dimension capable of obtaining the light irradiation interval.
That is, the dimension measurement range by the light irradiation interval measurement unit is configured by measuring the light irradiation interval measurement unit so as to measure a dimension capable of obtaining the light irradiation interval (for example, the above-described reference position-holder dimension). Since the maximum value of can be reduced, the cost of the light irradiation interval measuring unit can be reduced.
Therefore, the cost of the outer diameter measuring device can be reduced.

In addition to any one of the second to eighth feature configurations, the ninth feature configuration is
The object to be measured is a magnetic material;
In the outer periphery of the object to be measured, the light irradiation table and the object to be measured are disposed at positions facing the measurement object on the object to be measured in the laser light irradiation direction and receive laser light emitted from each light irradiation part. A pair of irradiated bodies having a light receiving surface is attached to the outer peripheral surface of the measured object by a magnetic force.

That is, since the irradiated object can be attached to the outer peripheral surface of the object to be measured by magnetic force, the irradiated object can be placed at an arbitrary position on the outer peripheral surface of the measured object without performing any processing on the outer peripheral surface of the measured object. Can be attached.
Therefore, the outer diameter measuring operation can be further simplified.

Front view of the outer diameter measuring apparatus according to the first embodiment The top view of the outer diameter measuring apparatus which concerns on 1st Embodiment The perspective view which shows the light irradiation stand and light irradiation stand arrangement | positioning part of the outer diameter measuring apparatus which concern on 1st Embodiment. Vertical left side view showing a light irradiation table and a light irradiation table arrangement part of the outer diameter measuring apparatus according to the first embodiment The front view which shows the mounting base and light irradiation stand arrangement | positioning part of the outer diameter measuring apparatus which concern on 1st Embodiment. The perspective view which shows the base fixing | fixed part of the outer diameter measuring apparatus which concerns on 1st Embodiment. The perspective view which shows the space | interval change part and light irradiation space | interval measurement part of the outer diameter measuring apparatus which concern on 1st Embodiment. Plan sectional drawing which shows the space | interval change part and light irradiation space | interval measurement part of the outer diameter measuring apparatus which concern on 1st Embodiment. The front view explaining the change of the arrangement position of a light irradiation stand in the outer diameter measuring apparatus which concerns on 1st Embodiment. The front view explaining the change of the arrangement position of a light irradiation stand in the outer diameter measuring apparatus which concerns on 1st Embodiment. The figure explaining the irradiation state of the laser beam from the light irradiation part with respect to an irradiated body Front view of the outer diameter measuring apparatus according to the second embodiment Plan view of the outer diameter measuring apparatus according to the second embodiment Vertical left side view showing a light irradiation table and a mounting table of an outer diameter measuring apparatus according to a second embodiment The front view which shows the light irradiation stand arrangement | positioning part of the outer diameter measuring apparatus which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the outer diameter measuring apparatus according to the present invention measures the outer diameter of an object to be measured W whose outer peripheral shape of the cross section is circular (cylindrical in this embodiment). . In this embodiment, for example, an iron water pipe buried in the ground is set as an object W to be measured for outer diameter.

[First Embodiment]
First, the first embodiment will be described.
As shown in FIGS. 1 to 3, the pair of light irradiation units 1 are irradiated with the laser beams V in parallel to each other in a direction orthogonal to the arrangement direction of the pair of light irradiation units 1, and the interval changing unit A It is provided in the light irradiation stand B so that a mutual space | interval can be changed freely. That is, the irradiation direction of the laser beam V from each light irradiation unit 1 is, for example, a broken line direction indicating the laser beam V in FIGS.
Further, a light irradiation interval measuring unit C for measuring a dimension capable of obtaining the light irradiation interval of the pair of light irradiation units 1 changed by the interval changing unit A is provided in the light irradiation table B.
Then, the outer diameter measuring apparatus irradiates the pair of light irradiations in a state in which the arrangement direction of the pair of light irradiation units 1 (hereinafter sometimes simply referred to as the light irradiation unit arrangement direction) is parallel to the circumferential direction of the measurement object W. The light irradiation table B is covered in a state in which the laser light irradiation direction of each of the pair of light irradiation units 1 is parallel to the radial direction of the measurement target W in the middle of the unit 1 and perpendicular to the radial direction of the measurement target W. The light irradiation stand arrangement | positioning part D arrange | positioned along the outer peripheral part of the measurement object W is provided and comprised.
Further, the outer diameter measuring device is disposed at a position facing the light irradiation table B and the measurement point Q of the measurement object W in the outer peripheral portion of the measurement object W in the laser light irradiation direction. 1 is provided with a pair of irradiated bodies 2 having a light receiving surface 2 s that receives the laser light V emitted from 1.
Incidentally, a laser pointer is used as the light irradiation unit 1. This laser pointer irradiates light of red, green, etc. in a state where diffusion is suppressed, and since it is well known, detailed description and illustration are omitted.

Next, description will be added for each part of the outer diameter measuring apparatus.
First, the light irradiation table arrangement part D will be described.
As shown in FIG. 1, FIG. 9 and FIG. 10, in this first embodiment, the light irradiation table arrangement part D is configured to be able to change the arrangement position of the light irradiation table B in the circumferential direction of the object W to be measured. ing.
Specifically, as shown in FIGS. 1 to 3, the light irradiation table disposition portion D includes an arcuate frame 3 having an inner diameter larger than the outer diameter of the object to be measured W, and the arcuate frame 3 as the object to be measured. A longitudinal direction of the arcuate frame 3 (circumferentially around the outer circumference of the arcuate frame 3 by the frame fixing part E and the base fixing part F that are fixed to the outer periphery of the workpiece W in a state of being spaced apart from the outer circumferential surface of W. And a mounting base G fixed to the arcuate frame 3 so that the fixing position can be changed freely. The light irradiation base B is attached to the mounting base G. It has been.
Furthermore, in the first embodiment, the arc-shaped frame 3 is an arc-shaped frame having a central angle larger than 180 °, and the frame fixing portion E includes at least two locations separated by 180 ° or more in the central angle. The plurality of pressing bodies 4 are provided on the arcuate frame 3 in a state in which a force for pressing the tip against the outer peripheral surface of the workpiece W can be applied to a plurality of positions 3 in the longitudinal direction.

As shown in FIGS. 4 and 5, the arc-shaped frame 3 is configured in a groove shape having a U-shaped cross section.
The arc-shaped frame 3 has an arc shape with a central angle of 210 °, and two arc-shaped second frames with a central angle of 60 ° at both ends of the arc-shaped first frame portion 3a with a central angle of 90 °. It is comprised by connecting the part 3b separately by a connection part. Although the detailed description and illustration are omitted, the connecting portion is configured to connect the longitudinal ends of the first frame portion 3a and the second frame portion 3b using bolts or the like.

  That is, by forming the arcuate frame 3 from the first frame part 3a and the two second frame parts 3b that can be connected to and separated from each other, the arcuate frame 3 having a central angle larger than 180 ° can be obtained. In addition, it can be arranged on the outer peripheral portion of the workpiece W without passing through the end in the axis Z direction in the axis Z direction.

As shown in FIG. 1, the pressing body 4 includes two pieces of the object W to be measured at four places that are substantially uniformly distributed in the longitudinal direction of the arc-shaped frame 3 including two places that are separated by 180 ° or more at the central angle. They are arranged side by side in the axial center Z direction.
As shown in FIG.1 and FIG.4, the width direction (axis Z direction of the to-be-measured object W) of each location which should provide the press body 4 in the arc-shaped frame 3 is each width direction from the arc-shaped frame 3. A pressing body support plate 5 is provided so as to project outward, and each pressing body support plate 5 is provided with a screw hole 5a.
The pressing body 4 includes a bolt portion 4a that is screwed into the screw hole 5a of the pressing body support plate 5, and a disc-shaped contact that is attached to the tip of the bolt portion 4a and contacts the outer peripheral surface of the object W to be measured. Part 4b.
That is, by rotating the pressing body 4 in which the bolt portion 4a is screwed into the pressing body support plate 5 so that the contact portion 4b contacts the outer peripheral surface of the object W to be measured, the tip contact portion 4b is It is the structure which applies the force pressed on the outer peripheral surface of the to-be-measured object W.

Then, as shown in FIG. 1, the arcuate frame 3 is arranged on the outer periphery of the workpiece W so that the longitudinal direction thereof is along the circumferential direction of the workpiece W, and the arcuate frame 3 is arranged in the longitudinal direction of the arcuate frame 3. The abutting portions 4b of the eight pressing bodies 4 that are dispersed and provided in two places at four locations are brought into contact with the outer peripheral surface of the object to be measured W, and the outer peripheral surface of the object to be measured W and the arcuate frame 3 By adjusting the screwing position of the bolt portion 4a of each pressing body 4 with respect to the pressing body support plate 5 so that the distance from the inner peripheral surface is substantially constant in the circumferential direction of the workpiece W, the arcuate frame 3 Can be arranged in a fixed state concentrically with the measurement object W on the outer periphery of the measurement object W.
Incidentally, when the workpiece W is arranged so that its axis Z direction is in the lateral direction, the center of the arcuate frame 3 in the longitudinal direction is the axis of the workpiece W as shown in FIG. The arcuate frame 3 is arranged on the outer periphery of the workpiece W so as to be positioned vertically above the center Z.

As shown in FIGS. 1, 4, and 5, the mounting base G includes a groove-like base portion 6 having a rectangular shape in plan view and a U-shaped cross-sectional shape, and a lower portion of the groove-like base portion 6. It is configured to include four wheels 7 and the like that are rotatably provided.
The four wheels 7 are arranged one by one on both ends in the longitudinal direction of the grooved base 6, and each pair of wheels 7 is rotatable on the same axle along the width direction of the grooved base 6. Is provided.
The mounting base G is arranged with the four wheels 7 fitted in the grooves of the arcuate frame 3 in a posture in which the longitudinal direction thereof is along the longitudinal direction of the arcuate frame 3. The wheel 7 can be moved along the longitudinal direction of the arc-shaped frame 3.

As shown in FIGS. 1, 5, and 6, at both ends in the longitudinal direction of the grooved carriage 6 of the mounting base G, the base mounting bolts 8 are arranged in the longitudinal direction of the grooved carriage 6. At the base end, the base end is swingably supported around the axis along the width direction of the grooved carriage 6.
In the base mounting bolt 8, a collar connecting block 10 having a pair of collar parts 9 at both ends in the width direction is movably inserted in the longitudinal direction of the base mounting bolt 8. A base mounting nut 11 is screwed to the front end side of the collar connecting block 10.

The arcuate frame 3 is provided with a pair of flanges 9 supported by the base mounting bolts 8 at both ends in the longitudinal direction of the mounting base G in correspondence with a plurality of locations along the longitudinal direction to which the mounting base G is mounted. A pin 12 that can be freely fitted is provided.
In this 1st Embodiment, as shown in FIG. 1, it is a pin so that the mounting base G can be attached to five positions of P1-P5 distributed in the circumferential direction in the outer peripheral part of the to-be-measured object W. 12 is arranged. FIG. 1 is a view of the workpiece W as viewed in the axial (Z) direction.

Incidentally, P1 is an outer diameter corresponding to the diameter along the horizontal direction of the measurement object W by arranging the light irradiation table B so that the alignment direction of the light irradiation parts is horizontal above the outer periphery of the measurement object W. It is a position for measuring.
As shown in FIG. 9, P2 is arranged so that the light irradiation table B is inclined to the right by 45 ° upward with respect to the horizontal direction, obliquely above and to the left of the outer periphery of the workpiece W. Then, it is a position for measuring the outer diameter corresponding to the diameter of 45 ° upward to the horizontal direction in the workpiece W.
As shown in FIG. 10, P3 is arranged so that the light irradiation table B is arranged on the left side of the outer periphery of the measurement target W so that the light irradiation unit alignment direction is along the vertical direction. It is a position for measuring the outer diameter corresponding to the diameter along.
In P4, the light irradiation table B is arranged on the right side of the outer periphery of the measurement object W so that the light irradiation unit alignment direction is inclined 45 ° upward with respect to the horizontal direction. This is a position for measuring the outer diameter corresponding to the diameter that rises 45 ° to the left in the horizontal direction.
Further, P5 is an outer side corresponding to the diameter along the vertical direction of the measurement object W by arranging the light irradiation table B on the right side of the outer periphery of the measurement object W so that the light irradiation unit alignment direction is along the vertical direction. This is the position for measuring the diameter.

  As shown in FIGS. 1, 9, and 10, the pins 12 are provided at the respective ends of the mounting base G in the longitudinal direction when the mounting base G is disposed at each of the longitudinal positions P <b> 1 to P <b> 5 of the arcuate frame 3. The arcuate frame 3 is provided corresponding to each position P1 to P5 so that the pair of flanges 9 supported by the mounting bolts 8 can be fitted.

Then, the mounting base G is disposed at a predetermined position in the longitudinal direction of the arcuate frame 3 (P1 in FIG. 1), and a pair of flanges 9 supported by the base mounting bolts 8 at both ends in the longitudinal direction of the mounting base G. Are fixed to the pins 12 and the base mounting nuts 11 are tightened toward the base end side of the base mounting bolts 8 to fix the mounting base G in a predetermined position in the longitudinal direction of the arc-shaped frame 3 (P1 in FIG. 1). ) Can be fixed. When the mounting base G is fixed to the arcuate frame 3 in this way, the longitudinal direction of the mounting base G is configured to be substantially perpendicular to the radial direction of the workpiece W at the approximate center of the longitudinal direction. Yes.
That is, a pair of base mounting bolts 8 each provided with a pair of flange portions 9 and base mounting nuts 11 at the tips, and pins 12 provided at a plurality of longitudinal positions in the arcuate frame 3 are provided. The base fixing part F is configured.

Next, the light irradiation table B will be described based on FIGS.
The light irradiation table B is configured by mounting a long rectangular tube-shaped base column 14 on a rectangular rocking table 13 in a plan view in a posture in which both ends protrude from the rocking table 13.
Although details will be described later, the interval changing unit A and the light irradiation interval measuring unit C are respectively provided at both ends of the base pillar 14.
At one end in the longitudinal direction of the oscillating base 13, two pivot plates 15 having circular shaft holes are distributed to both sides in the width direction of the oscillating base 13, and the base pillars of the oscillating base 13 are respectively attached. It is attached so that it may protrude on the opposite side to the side.
Further, two swing guide plates 16 having an oval guide hole 16a are distributed to both sides in the width direction of the swing base 13 at the other end in the longitudinal direction of the swing base 13, respectively. The base 13 is mounted so as to protrude on the side opposite to the base mounting side. In this state where the swing guide plate 16 is attached to the swing base 13, the longitudinal direction of the guide hole 16 a of the swing guide plate 16 is substantially orthogonal to the swing base 13.
As shown in FIG. 4, the distance between the inner surfaces of the two pivot plates 15 and the distance between the inner surfaces of the two swing guide plates 16 are determined by the two pivot plates 15 and the two sheets. Each of the swing guide plates 16 is set at an interval that allows the swing guide plate 16 to be fitted onto the groove-like base portion 6 of the mounting base G.

The light irradiation table B has two pivot plates 15 and two swing guide plates in a posture in which the longitudinal direction (corresponding to the longitudinal direction of the base column 14) is aligned with the longitudinal direction of the mounting table G. 16 is inserted into the groove-like base portion 6 of the mounting base G, and the pivot shaft 17 is inserted into the shaft hole and the groove-like base portion 6 of each of the two pivot plates 15, and A fixing bolt 18 with a knob is screwed into the grooved base 6 through the guide holes 16a of the two swing guide plates 16 respectively. That is, the light irradiation table B is supported by the mounting table G so as to be swingable around the pivot shaft 17 orthogonal to the width direction.
Thus, in the state where the light irradiation table B is supported by the mounting table G, the longitudinal direction of the light irradiation table B (that is, the light irradiation unit alignment direction) is the radial direction of the measurement object W at the approximate center of the longitudinal direction. It is comprised so that it may be in the state orthogonal to.

Further, the inclination adjusting bolt 19 is screwed into the base column 14 and the swinging base 13 with the tip thereof being in contact with the bottom surface of the groove-like base 6.
In a state where the fixing bolt 18 is loosened, the tilt adjusting bolt 19 is rotated forward and backward to swing the light irradiation table B around the pivot shaft 17, thereby arranging the light irradiation parts of the light irradiation table B in the horizontal direction. The angle can be finely adjusted.
Then, the light irradiation table B is moved in the horizontal direction by tightening the fixing bolt 18 in a state where the angle of the light irradiation unit arrangement direction of the light irradiation table B with respect to the horizontal direction is measured with an angle meter (not shown) and finely adjusted. Can be fixed to the mounting base G so that the angle of the light irradiation unit arrangement direction with respect to the angle corresponding to the mounting position (any one of P1 to P5) of the mounting base G.

That is, in this 1st Embodiment, the light irradiation stand arrangement | positioning part D is comprised also with the inclination adjustment volt | bolt 19 which can adjust the angle of the light irradiation part arrangement | positioning direction of the light irradiation stand B with respect to the attachment stand G, The light irradiation unit arrangement direction with respect to the horizontal direction can be finely adjusted.
Therefore, in measuring the outer diameter corresponding to the diameter of the object W to be measured with respect to the horizontal direction, the light irradiation unit alignment direction of the light irradiation table B with respect to the horizontal direction can be accurately adjusted to the predetermined angle. Since it can do, the outer diameter of the predetermined location in the to-be-measured object W can be measured appropriately.

Next, the interval changing unit A and the light irradiation interval measuring unit C will be described with reference to FIGS.
A holder 20 that holds the light irradiation unit 1 is supported at both ends of the base column 14 so as to be movable along the longitudinal direction of the base column 14 (light irradiation unit arrangement direction), and a pair of light irradiation units. A pair of holders 20 holding 1 are supported by the light irradiation table B so as to be movable separately along the light irradiation unit arrangement direction.
Further, a holder moving operation unit H is provided for moving the holder 20 holding the light irradiation unit 1 along the longitudinal direction of the base pillar 14.
Further, at both ends of the base column 14, a distance measuring ruler 21 that measures the distance between the holder 20 moved by the holder moving operation unit H and the reference position (Px, Py) in the longitudinal direction of the base column 14. Is provided.
The interval measuring measure 21 has a bow-shaped cross section, and a length measuring scale 21 a is displayed on a plane portion corresponding to an arcuate string on the outer peripheral surface of the interval measuring measure 21.

A description will be given of a configuration in which each holder 20 is supported so as to be movable along the longitudinal direction of the base column 14.
At both ends of the base pillar 14, a generally elliptical bowl-shaped part 22 having a round hole communicating with the internal space of the base pillar 14 is attached, and a female screw member 23 is fitted into the bowl-shaped part 22. It is attached in a state.
A cylindrical guide rod 24 and the interval measuring scale 21 are distributed to both side portions of the female screw member 23 in a posture extending in parallel to the base column 14 on the opposite side to the base column 14. Is attached.
The holder 20 has two insertion holes, and is provided with a plate-like support portion 20a provided by inserting the guide rod 24 and the interval measuring rule 21 through the two insertion holes, and a base in the plate-like support portion 20a. The laser holding unit 20b is attached to a surface opposite to the column 14 side. Thereby, the holder 20 is supported by the end of the base pillar 14 by the guide of the guide rod 24 so as to be movable along the longitudinal direction of the base pillar 14.

A screw shaft 26 is screwed into the female screw member 23, and an end portion of the screw shaft 26 opposite to the base column 14 side is in the plate-like support portion 20 a of the holder 20 along the longitudinal direction of the base column 14. Relative movement in the (light irradiation part arrangement direction) is blocked and is relatively rotatably connected.
Then, by rotating the screw shaft 26 forward and backward with the knob 26 a at the end of the screw shaft 25, the holder 20 holding the light irradiation unit 1 is moved along the light irradiation unit alignment direction by the guide to the guide rod 24. can do.
That is, the holder moving operation portion H is configured by the female screw member 23, the screw shaft 26, and the like.

  The laser holding portion 20b has a U-shaped cross section. And in the state which has arrange | positioned the light irradiation part 1 in the laser holding part 20b, it has the structure which hold | maintains the light irradiation part 1 in the holder 20 by tightening the fixing bolt 25 from 3 surfaces of the laser holding part 20b. .

When the light irradiation unit 1 is held on the pair of holders 20 respectively supported on both sides of the base column 14 of the light irradiation table B as described above, the irradiation directions of the laser light V are parallel to each other. It is provided in the light irradiation stand B so that.
Then, as described above, the arc-shaped frame 3 is fixed to the outer periphery of the workpiece W, and the mounting base G is attached to any one of P1 to P5 in the longitudinal direction of the arc-shaped frame 3, and the mounting base When the light irradiation table B is supported on G as described above, the light irradiation table B is covered at the approximate center of the pair of light irradiation units 1 with the light irradiation unit alignment direction being parallel to the circumferential direction of the object W to be measured. Arranged along the outer periphery of the object to be measured W in a state perpendicular to the radial direction of the object to be measured W and the laser light irradiation direction of each of the pair of light irradiation units 1 is orthogonal to the axis Z direction of the object to be measured W. Will be.
Further, the inclination adjusting bolt 19 adjusts the angle of the light irradiation unit arrangement direction with respect to the horizontal direction to an angle (0 ° in the case of P1) corresponding to the arrangement position (any one of P1 to P5) of the light irradiation table B. The inclination of the light irradiation table B is adjusted.

  The scale 21a of the interval measuring scale 21 is set to 0 at a position (corresponding to reference positions Px and Py described later) intersecting with the surface of the bowl-shaped portion 22 opposite to the base 14 side. It is displayed in a form in which the length increases on the side opposite to the side.

1 and 2, the left side in the longitudinal direction is referred to as the X side and the right side in the longitudinal direction is referred to as the Y side with respect to the longitudinal center of the base column 14.
An interval between the surfaces opposite to the base column 14 side in the ridges 22 on both sides of XY (hereinafter referred to as a reference position dimension T) is a constant value and can be measured in advance.
Further, the surface on the base column 14 side of the plate-like support portion 20 a of the X-side holder 20, and the center of the laser beam V (the center of the cross section) from the light irradiation unit 1 held by the X-side holder 20 The interval in the direction along the longitudinal direction of the base column 14 between the two (hereinafter, the X-side holder-beam dimension (corresponding to the holder-light irradiation part dimension) S _X is a constant value and is measured in advance. be able to.
Furthermore, the surface on the side of the base column 14 in the plate-like support portion 20a of the Y-side holder 20 and the center of the laser beam V from the light irradiation unit 1 held by the Y-side holder 20 (the center of the cross section) The interval in the direction along the longitudinal direction of the base pillar 14 between the two (hereinafter, the Y-side holder-beam dimension (corresponding to the dimension between the holder and the light irradiation section) S _Y is also a constant value and is measured in advance. be able to.

By means of the X-side distance measuring measure 21, the surface on the side opposite to the base column 14 side of the X-side flange 22 and the surface on the side of the base column 14 in the plate-like support portion 20 a of the X-side holder 20 are defined. The interval between them (hereinafter referred to as X side reference position-holder dimension M _X ) can be measured.
Similarly, the Y-side distance measuring scale 21 allows the surface of the Y-side flange 22 to be opposite to the side of the base 14 and the base 14 of the Y-side holder 20 on the plate-like support 20a. The distance between the side surfaces (hereinafter referred to as Y side reference position-holder dimension M _Y ) can be measured.
And the space | interval of the centers of the laser beam V irradiated from a pair of light irradiation part 1, ie, light irradiation space | interval L, can be calculated | required by the following formula | equation (1).

L = T + S _X + S _Y + M _X + M _Y (1)

The light irradiation interval L can be changed by operating the holder moving operation units H on both sides of XY.
In other words, the interval changing unit A is configured by a pair of holder moving operation units H on both sides of the XY, and the light irradiation interval L is changed by moving the pair of light irradiating units 1 separately along their arrangement direction. Is configured to do.

A position Px at which the surface opposite to the base 14 side of the X-side saddle-shaped portion 22 intersects the X-side interval measuring measure 21 is set as an X-side reference position Px in the light irradiation unit arrangement direction, and the Y-side A position Py at which the surface opposite to the base 14 side of the bowl-shaped portion 22 intersects the Y-side interval measuring measure 21 is defined as a Y-side reference position Py in the light irradiation unit arrangement direction.
The X side reference position-holder dimension M _X that is changed and adjusted by the X side holder moving operation unit H by the X side interval measuring measure 21, that is, the X side reference positions Px and X in the light irradiation unit arrangement direction. The distance with the side holder 20 can be measured.
Similarly, the Y-side distance measuring measure 21 changes and adjusts the Y-side reference position-holder dimension M _Y by the Y-side holder moving operation unit H, that is, the Y-side in the light irradiation unit alignment direction. The interval between the reference position Py and the Y-side holder 20 can be measured.
That is, the light irradiation interval measuring unit C is configured by a pair of interval measuring measures 21 on both sides of the XY, and the light irradiation interval is obtained from the intervals between the reference positions Px, Py and the holders 20 in the light irradiation unit arrangement direction. It is configured to measure as possible dimensions.

  The irradiated body 2 is formed in a rectangular parallelepiped shape with a magnet, and can be attached to an arbitrary position according to various measured points Q on the outer peripheral surface of the measured object W by a magnetic force as shown in FIG. it can.

Next, a procedure for measuring the outer diameter of the workpiece W using the outer diameter measuring apparatus of the first embodiment will be described.
First, based on FIG. 1, the case where the outer diameter corresponding to the diameter along the horizontal direction in the to-be-measured object W is measured is demonstrated. In this case, the measurement point Q is a portion corresponding to the diameter along the horizontal direction on the outer peripheral surface of the measurement object W.
The arcuate frame 3 has a posture in which the longitudinal direction is parallel to the circumferential direction of the workpiece W and the center of the longitudinal direction is located above the axis Z of the workpiece W in the vertical direction. It fixes to the outer peripheral part of the to-be-measured object W.
Subsequently, the mounting base G is fixed by the base fixing portion F at a position for arranging the light irradiation base B at the position P1 of the outer peripheral portion of the workpiece W in the arc-shaped frame 3.
Subsequently, the light irradiation table B is supported by the mounting base G, and an angle meter (not shown) is disposed on the upper surface of the base column 14 (the surface opposite to the mounting base G). The inclination of the light irradiation table B is finely adjusted by the inclination adjusting bolt 19 so that the measurement angle becomes 0 °.
Subsequently, in correspondence with the Y-side light irradiation unit 1, the outer periphery of the measurement object W is applied to the Y-side irradiation object 2 so that the laser light V from the Y-side light irradiation unit 1 hits the light receiving surface 2s. Attached to the surface of the surface across the measurement point Q and facing the Y-side light irradiation unit 1 in the laser light irradiation direction.
Similarly, the outer periphery of the measurement object W corresponds to the X-side light irradiation unit 1 such that the laser beam V from the X-side light irradiation unit 1 strikes the light receiving surface 2s. Attached to the X-side light irradiation part 1 in the laser beam irradiation direction across the measurement point Q on the surface.

Subsequently, the Y-side holder moving operation unit H is operated, and the laser light V from the Y-side light irradiation unit 1 corresponds to the horizontal diameter on the outer peripheral surface of the object W to be measured, as shown in FIG. The position of the moment when the entire laser light V irradiated to the light-receiving surface 2s of the Y-side irradiated body 2 is blocked by the outer peripheral surface of the measurement object W and is moved inward from the outside to the inside Next, the Y-side light irradiation unit 1 is positioned.
Similarly, by operating the X-side holder moving operation unit H, the laser beam V from the X-side light irradiation unit 1 is moved from the outside to the inside of the portion corresponding to the horizontal diameter on the outer peripheral surface of the workpiece W. X-side light irradiation at a position where the entire laser light V irradiated to the light-receiving surface 2s of the X-side irradiated body 2 is blocked by the outer peripheral surface of the object W and disappears. Position part 1.
Then, by the distance measuring scale 21 in the Y-side, Y-side reference position - measuring the dimensions M _Y between the holder, the interval measurement scale 21 of the X side, the X-side reference position - measuring the dimensions M _X between the holder.
Subsequently, the light irradiation interval L is obtained by the above formula 1, and the obtained light irradiation interval L is set as an outer diameter corresponding to the diameter along the horizontal direction of the workpiece W.

Next, the case where the outer diameter corresponding to the diameter of 45 ° upward with respect to the horizontal direction in the workpiece W is measured will be described. In this case, as shown in FIG. 9, a portion corresponding to a diameter of 45 ° upward to the horizontal direction on the outer peripheral surface of the workpiece W becomes the measurement point Q.
First, as shown in FIG. 9, the mounting base G is fixed by the base fixing part F at the position for disposing the light irradiation base B at the position P2 of the outer peripheral part of the object W to be measured in the arc-shaped frame 3. Then, the light irradiation table B is supported on the mounting table G, and the inclination of the light irradiation table B is finely adjusted by the inclination adjusting bolt 19 so that the measurement angle of the goniometer becomes 45 °.
Subsequently, as in the case of measuring the outer diameter corresponding to the diameter along the horizontal direction as described above, the outer circumference of the measurement object W is made to correspond to each of the light irradiation units 1 on both sides of the XY. Attach to the surface.
Subsequently, the Y-side holder moving operation unit H is operated so that the laser beam V from the Y-side light irradiation unit 1 is outside the portion corresponding to the 45 ° upward diameter on the outer peripheral surface of the measurement object W. The Y-side object 2 is moved to the inner side, and the Y-side irradiated body 2 is irradiated with the laser beam V irradiated on the light receiving surface 2s. The light irradiation unit 1 is positioned.
Similarly, by operating the X-side holder moving operation unit H, the laser beam V from the X-side light irradiation unit 1 is applied from the outside of the portion corresponding to the 45 ° upward diameter on the outer peripheral surface of the workpiece W. The X-side is moved to the position where the entire laser beam V irradiated to the light-receiving surface 2s of the X-side irradiated body 2 is blocked by the outer peripheral surface of the object W and disappears. The light irradiation unit 1 is positioned.
Then, by the distance measuring scale 21 of the XY sides, X-side reference position - the holder dimension between M _X and Y-side reference position - by measuring the people dimension M _Y respectively between the holder, by Equation 1 above to obtain the light irradiation interval L Thus, the obtained light irradiation interval L is set to the outer diameter corresponding to the diameter rising 45 ° to the horizontal direction of the workpiece W.

Next, the case where the outer diameter corresponding to the diameter along the vertical direction of the measurement target W is measured on the left side of the outer peripheral portion of the measurement target W will be described. In this case, as shown in FIG. 10, a portion corresponding to the diameter along the vertical direction on the outer peripheral surface of the workpiece W becomes the measurement point Q.
First, as shown in FIG. 10, the mounting base G is fixed by the base fixing part F at the position for disposing the light irradiation base B at the position P3 of the outer peripheral part of the object W to be measured in the arc-shaped frame 3. Then, the light irradiation table B is supported on the mounting table G, and the inclination of the light irradiation table B is adjusted by the inclination adjusting bolt 19 so that the measurement angle of the goniometer becomes 90 °.
Subsequently, as in the case of measuring the outer diameter corresponding to the diameter along the horizontal direction as described above, the outer circumference of the measurement object W is made to correspond to each of the light irradiation units 1 on both sides of the XY. Attach to the surface.
Subsequently, the Y-side holder moving operation unit H is operated, and the laser beam V from the Y-side light irradiation unit 1 is moved from the outside to the inside of the portion corresponding to the diameter along the vertical direction on the outer peripheral surface of the workpiece W. The Y-side light is moved to the position where the entire laser light V irradiated to the light-receiving surface 2s of the Y-side irradiated body 2 is blocked by the outer peripheral surface of the object W and disappears. The irradiation unit 1 is positioned.
Similarly, by operating the X-side holder moving operation unit H, the laser beam V from the X-side light irradiation unit 1 is directed from the outside to the inside corresponding to the diameter along the vertical direction on the outer peripheral surface of the object W to be measured. The X-side light is moved to the position where the entire laser light V irradiated to the light-receiving surface 2s of the X-side irradiated body 2 is blocked by the outer peripheral surface of the object W and disappears. The irradiation unit 1 is positioned.
Then, by the distance measuring scale 21 of the XY sides, X-side reference position - the holder dimension between M _X and Y-side reference position - by measuring the people dimension M _Y respectively between the holder, by Equation 1 above to obtain the light irradiation interval L Thus, the obtained light irradiation interval L is set as the outer diameter along the horizontal direction of the workpiece W.

  Although description is omitted, at the positions P4 and P5 on the outer peripheral portion of the workpiece W, the light irradiation table B can be arranged in the same manner as described above, and the outer diameter of the workpiece W can be measured.

In addition, the laser beam V irradiated from each light irradiation part 1 has a width | variety. For example, the diameter of the laser beam V irradiated from the laser pointer used as the light irradiation unit 1 in this embodiment is about 3 mm.
Therefore, when the value obtained by adding the diameter of the laser beam V to the light irradiation interval L obtained by the above equation (1) is the outer diameter of the workpiece W, the outer diameter of the workpiece W is measured with higher accuracy. can do.

As described above, according to the outer diameter measuring apparatus according to the first embodiment, even if the workpiece W is buried in the ground, only the portion to be measured is dug up and exposed, so that the portion to be measured W The outer diameter of the workpiece W can be accurately measured without rotating the.
In addition, the outer diameter of the workpiece W can be accurately measured even when the outer peripheral portion of the workpiece W is deformed into a convex shape or a concave shape.

[Second Embodiment]
Hereinafter, although 2nd Embodiment of this invention is described, since 2nd Embodiment mainly differs in the structure of the light irradiation stand arrangement | positioning part D, it is the structure which has the same component as 1st Embodiment, and the same effect | action. In order to avoid duplicate description, the elements are denoted by the same reference numerals, description thereof is omitted, and a configuration different from the first embodiment is mainly described.

That is, as shown in FIGS. 12 and 13, in this second embodiment, the light irradiation table arrangement portion D is tightened and loosened by the tightening portion I while being wound around the outer peripheral portion of the object W to be measured. Is configured to include a chain 31 that is freely movable and a mounting base G that is attached to the chain 31.
The light irradiation table B is attached to the mounting table G.

The chain 31 is a roller chain, and the chain 31 is formed in an annular shape by connecting both ends of the chain 31 that is not initially connected at both ends using the mounting base G.
That is, connecting the both ends of the chain 31 in a string state with the mounting base G in this manner to form an annular shape corresponds to attaching the mounting base G to the chain 31.

As shown in FIGS. 13 and 15, in a string state, a bolt support 33 is connected to one end of the chain 31 by a pair of arm portions 32, and a tightening adjustment bolt 34 is connected to the bolt support 33. The tip is directed to the opposite side to the chain 31 side and is supported rotatably in a state along the longitudinal direction of the chain 31.
The tightening adjustment bolt 34 is screwed into a pulley shaft body 35 that rotatably supports a pulley 36 at both ends in the width direction in a state orthogonal to the pulley shaft body 35.

The mounting base G is partly different from the first embodiment in relation to mounting it on the chain 31.
When this mounting base G is described further, as shown in FIGS. 13 to 15, the mounting base G includes a grooved base portion 6 and four wheels 7 as in the first embodiment. However, the base mounting bolt 8 and the flange 9 attached to the base mounting bolt 8 provided in the first embodiment are omitted.
A pair of wheels 7 disposed on both sides in the longitudinal direction of the groove-like base 6 are provided so as to protrude in the width direction of the groove-like base 6.

As shown in FIGS. 13 and 15, a pair of wheels 7 and a pair of pulleys 36 on one end side of the groove-like base portion 6 are connected by a belt 37, and a pair of the other end side of the groove-like base portion 6 is connected. The axle 7a that rotatably supports the wheel 7 and the shaft portion of the end of the string-like chain 31 are connected by a pair of connecting plates 38 so that both ends of the string-like chain 31 are connected by the mounting base G. Thus, the chain 31 is configured in an annular shape.
Then, by rotating the tightening adjustment bolt 34 forward and backward, the distance between the bolt support body 33 and the pulley shaft body 35 is adjusted, and the chain 31 is tightened in a state where the chain 31 is wound around the outer periphery of the workpiece W. The pair of arm portions 32, the bolt support 33, the tightening adjustment bolt 34, the pulley shaft body 35, the pair of pulleys 36, and the pair of belts 37 constitute a tightening portion I.

The light irradiation table G has the same configuration as that of the first embodiment except that the tilt adjustment bolt 19 is omitted, and is supported by the mounting table G with the same support configuration as that of the first embodiment.
In addition, the light irradiation table G is provided with the same interval changing unit A and light irradiation interval measuring unit C as in the first embodiment.

Hereinafter, a procedure for measuring the outer diameter of the workpiece W by the outer diameter measuring apparatus of the second embodiment will be described.
First, based on FIG. 12, the case where the outer diameter corresponding to the diameter along the horizontal direction in the to-be-measured object W is measured is demonstrated. In this case, the measurement point Q is a portion corresponding to the diameter along the horizontal direction on the outer peripheral surface of the measurement object W.
The chain 31 is wound around the object to be measured W by connecting both ends of the chain 31 in a string state around the object to be measured W with the mounting base G.
Then, with the mounting base G positioned at the upper part of the workpiece W in the substantially vertical direction, the mounting base G supports the light irradiation base B, and the upper surface of the base pillar 14 (the mounting base G side means The chain 31 is turned in the circumferential direction of the workpiece W so that the measurement angle of an angle meter (not shown) arranged on the opposite surface is 0 °, and the angle meter's measurement angle is 0 °. Then, the tightening adjustment bolt 34 is rotated in the forward direction, the chain 31 is fastened to the workpiece W, and the position of the light irradiation table B is fixed.
Then, a pair of to-be-irradiated body 2 is attached to the outer peripheral surface of the to-be-measured object W corresponding to each light irradiation part 1 of XY both sides similarly to 1st Embodiment.

Thereafter, similarly to the first embodiment described above, the holder moving operation portion H on both sides of XY is operated, and the distance measuring measure 21 on both sides of XY is used to measure the X side reference position-holder dimension M _X and the Y side reference position. Each of the holder dimensions M _Y is measured, and the light irradiation interval L is obtained by the above-described formula 1, and the obtained light irradiation interval L is set as an outer diameter corresponding to the diameter along the horizontal direction of the workpiece W.

Next, for example, a case where the outer diameter corresponding to the diameter along the vertical direction of the workpiece W is measured will be described.
In the state where the light irradiation table B is positioned at the position where the outer diameter corresponding to the diameter along the horizontal direction is measured as described above, the tightening adjustment bolt 34 is turned in the reverse direction to remove the chain 31 from the object W to be measured. After loosening, the chain 31 is rotated in the circumferential direction of the object W to be measured until the angle measured by the goniometer is 90 °. Then, the tightening adjustment bolt 34 is rotated in the forward direction, and the chain 31 is fastened to the workpiece W to fix the position of the light irradiation table B.
Then, a pair of to-be-irradiated body 2 is attached to the outer peripheral surface of the to-be-measured object W corresponding to each light irradiation part 1 of XY both sides similarly to 1st Embodiment.

Thereafter, similarly to the first embodiment described above, the holder moving operation portion H on both sides of XY is operated, and the distance measuring measure 21 on both sides of XY is used to measure the X side reference position-holder dimension M _X and the Y side reference position. - measures the people dimension M _Y respectively between the holder, by equation 1 above, seeking light irradiation interval L, and an outer diameter corresponding to the diameter along the light irradiation interval L calculated in the vertical direction of the object to be measured W.

  According to the outer diameter measuring apparatus of the second embodiment, the chain 31 wound around the object to be measured W is rotated in the circumferential direction of the object to be measured, and the angle of the light irradiation unit arrangement direction with respect to the horizontal direction is arbitrarily adjusted. Thus, in addition to the outer diameter corresponding to the diameter along the horizontal direction and the outer diameter corresponding to the diameter along the vertical direction, the outer diameter corresponding to the diameter inclined at an arbitrary angle with respect to the horizontal direction is measured. be able to.

[Another embodiment]
Next, another embodiment will be described.
(1) In the first embodiment described above, the arcuate frame 3 having a central angle larger than 180 ° is used, but it is also possible to use the arcuate frame 3 having a central angle of 180 ° or less.
In this case, for example, when the arcuate frame 3 is attached to the outer peripheral surface of the workpiece W using magnetic force, the frame fixing portion E can be reliably attached to the outer peripheral surface of the workpiece W.
And when the to-be-measured object W is embed | buried in the ground, the range exposed by digging up the to-be-measured object W for measuring an outer diameter can be narrowed.

(2) The configuration in which the pressing body 4 is provided on the arcuate frame 3 in a state where a force pressing the tip of the pressing body 4 against the outer peripheral surface of the workpiece W can be applied is the configuration illustrated in the first embodiment, The configuration is not limited to the configuration in which the pressing body 4 is provided with the bolt portion 4 a and the bolt portion 4 a is screwed into the pressing body support plate 5 attached to the arcuate frame 3.
For example, you may comprise so that the force which presses the press body 4 to the outer peripheral surface of the to-be-measured object W may be applied with the urging | biasing force by the coil spring of a compression state.

(3) In said 1st Embodiment, the arrangement position of the light irradiation stand B in the circumferential direction of the to-be-measured object W is not limited to five places of P1-P5.
For example, it may be one place. Or six or more places including P1-P5 and other positions may be sufficient.

(4) In said 1st Embodiment, the installation position and installation number of the press body 4 in the circular arc frame 3 can be variously changed.

(5) The workpiece W is not limited to the iron described in the above embodiment, and may be made of, for example, a resin.

(6) In each of the first and second embodiments described above, the irradiation object 2 is illustrated as being attached to the outer peripheral surface of the measurement object W using magnetic force. However, the measurement object W is a non-magnetic material. May be attached to the outer peripheral surface of the workpiece W by means such as a double-sided tape that can be easily attached and detached.

(7) The holder moving operation unit H may be provided with an actuator that moves the holder 20 along the longitudinal direction of the base pillar 14.

(8) An encoder (for example, a linear encoder) for measuring the X-side reference position-holder dimension M _X and the Y-side reference position-holder dimension M _Y is provided, and the light irradiation interval measuring unit C is set as the X-side reference. position - the holder dimension between M _X and Y-side reference position - may constitute a measured value of the dimension M _Y between the holder so that the digital display.

(9) The specific structure of the light irradiation stand arrangement | positioning part D is not limited to the structure illustrated in said each 1st and 2nd embodiment.
For example, when the workpiece W is a magnetic body, a configuration in which the light irradiation table B is attached to the outer peripheral surface of the workpiece W using a magnetic force can be employed.

(10) The specific configuration of the interval changing unit A for changing the light irradiation interval is the configuration exemplified in each of the first and second embodiments described above, that is, the pair of light irradiation units 1 in the arrangement direction thereof. It is not limited to the structure which moves separately along each.
For example, a configuration in which any one of the pair of light irradiation units 1 is moved along the arrangement direction thereof, or a configuration in which the pair of light irradiation units 1 are simultaneously moved in the opposite directions along the alignment direction is adopted. can do.

(11) In each of the first and second embodiments described above, the light irradiation interval measurement unit C is configured to measure the dimension capable of obtaining the light irradiation interval, but the light irradiation interval itself is obtained. You may comprise as follows.

(12) In order to measure the outer diameter of the workpiece W, the mode in which the light irradiation interval L is changed by moving the laser light V emitted from each of the pair of light irradiation units 1 by the interval changing unit A is as described above. It is not limited to the form described in the embodiment.
For example, as in the above-described embodiment, the laser light V emitted from each of the pair of light irradiation units 1 is from the outside of the portion corresponding to the diameter parallel to the light irradiation unit arrangement direction on the outer peripheral surface of the measurement object W. When changing the light irradiation interval L so as to move inward, each laser beam V is at the moment when it begins to hit the part corresponding to the diameter parallel to the light irradiation unit alignment direction on the outer peripheral surface of the measurement object W. The light irradiation interval L may be adjusted.

  Further, the laser light V emitted from each of the pair of light irradiation units 1 moves from the inside to the outside of the portion corresponding to the diameter parallel to the light irradiation unit arrangement direction on the outer peripheral surface of the measurement object W. By changing the light irradiation interval L, the position of each laser beam V at the moment when the entire laser beam V deviates from the portion corresponding to the diameter parallel to the light irradiation unit arrangement direction on the outer peripheral surface of the object W or the laser beam V The light irradiation interval L may be adjusted to a position at the moment when the tip in the movement direction protrudes from the portion corresponding to the diameter parallel to the light irradiation portion arrangement direction on the outer peripheral surface of the workpiece W.

  As described above, it is possible to provide an outer diameter measuring apparatus that can accurately measure the outer diameter of the object to be measured while the object to be measured is stationary.

DESCRIPTION OF SYMBOLS 1 Light irradiation part 2 To-be-irradiated body 2s Light-receiving surface 3 Circular frame 4 Pressing body 20 Holder 31 Chain A Space | interval change part B Light irradiation stand C Light irradiation interval measurement part D Light irradiation stand arrangement | positioning part E Frame fixing | fixing part F Stand fixing | fixed part G Mounting base I Fastening part Px, Py Reference position Q Measurement point V Laser light W Object to be measured

Claims (9)

An outer diameter measuring device that measures the outer diameter of an object to be measured having a circular outer cross-sectional shape,
The pair of light irradiation units are provided on the light irradiation table so that the interval between the pair of light irradiation units can be freely changed by the interval changing unit in a state of irradiating the laser beams in parallel with each other in a direction orthogonal to the arrangement direction of the pair of light irradiation units
A light irradiation interval measuring unit for measuring a light irradiation interval of the pair of light irradiation units changed by the interval changing unit or a dimension capable of obtaining the light irradiation interval is provided in the light irradiation table;
The alignment direction of the pair of light irradiation units is parallel to the circumferential direction of the measurement object, and is orthogonal to the radial direction of the measurement object in the middle of the pair of light irradiation units, and each of the pair of light irradiation units. An outer diameter measuring device comprising a light irradiation table arrangement part that arranges the light irradiation table along the outer peripheral part of the measurement object in a state where the laser light irradiation direction of the measurement object is parallel to the radial direction of the measurement object .   In the outer periphery of the object to be measured, the light irradiation table and the object to be measured are disposed at positions facing the measurement object on the object to be measured in the laser light irradiation direction and receive laser light emitted from each light irradiation part. The outer diameter measuring apparatus according to claim 1, further comprising a pair of irradiated bodies having a light receiving surface.   The outer diameter measuring device according to claim 1, wherein the light irradiation table arrangement unit is configured to be able to change the arrangement position of the light irradiation table in the circumferential direction of the object to be measured. The light irradiation stand arrangement part is
An arcuate frame having an inner diameter larger than the outer diameter of the object to be measured;
A frame fixing portion for fixing the arc-shaped frame to the outer peripheral portion of the measurement object in a state of being spaced from the outer peripheral surface of the measurement object;
A mounting base fixed to the arcuate frame so that the fixing position in the longitudinal direction of the arcuate frame can be freely changed by the base fixing part;
The outer diameter measuring device according to claim 3, wherein the light irradiation table is attached to the mounting table. The arcuate frame is arcuate with a central angle greater than 180 °;
The frame fixing portion can apply a force for pressing the tip to the outer peripheral surface of the object to be measured at a plurality of positions in the longitudinal direction of the arc-shaped frame including at least two positions separated by 180 ° or more at the central angle. The outer diameter measuring device according to claim 4, comprising a plurality of pressing bodies provided on the arcuate frame in a state. The light irradiation stand arrangement part is
A chain that can be tightened and loosened by a tightening portion while being wound around the outer peripheral portion of the object to be measured;
Comprising a mounting base attached to the chain,
The outer diameter measuring device according to claim 3, wherein the light irradiation table is attached to the mounting table.   The said space | interval change part is comprised so that the said light irradiation space | interval may be changed by moving the said pair of light irradiation part separately along those arrangement directions, The any one of Claims 1-6. The outer diameter measuring device according to 1. A pair of holders holding the pair of light irradiation units are supported by the light irradiation table so as to be movable separately along the direction in which the pair of light irradiation units are arranged,
The interval changing unit is configured to change the light irradiation interval by moving the pair of holders along the alignment direction of the pair of light irradiation units,
The light irradiation interval measurement unit is configured to measure a distance between a reference position and each holder in an arrangement direction of the pair of light irradiation units as a dimension capable of obtaining the light irradiation interval. Item 8. The outer diameter measuring device according to Item 7. The object to be measured is a magnetic material;
In the outer periphery of the object to be measured, the light irradiation table and the object to be measured are disposed at positions facing the measurement object on the object to be measured in the laser light irradiation direction and receive laser light emitted from each light irradiation part. The outer diameter measuring device according to any one of claims 2 to 8, wherein a pair of irradiated objects having a light receiving surface is attached to an outer peripheral surface of the object to be measured by a magnetic force.

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