JPH102702A - Probe for measuring inner diameter of hole of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a probe for measuring the inner diameter of the hole of a pipe which enables highly accurate measurement of the inner diameter of the hole of a pipe, regardless of the depth of the pipe hole while allowing automatic measurement of the inner diameter of the pipe hole. SOLUTION: Front stabilizers 2 and 4, a tensioner 10 and a spring plunger 13 are arranged as shaft-core-adjusting means at four points, along the length of a probe body 31 and strain plates 6A and 6B and a strain gauge mounted on 6A and 6B are provided as pipe hole inner diameter measuring means at the central part of the probe body 31. Small ball bearings 9A and 9B are provided at both end parts of the strain plates 6A and 6B. Moreover, an end part of a rear support 12 is loosely fitted into the end part of a plug holder 14 at a base end part of the probe body 31, while head parts (protruded parts) of screws 22 screwed down at four points on the outer circumference of the end part of the rear support 12 are loosely fitted into holes 14b, formed at four points in the circumferential direction at the end part of the plug holder 14, to couple the rear support 12 to the plug holder 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a borehole inner diameter measuring probe, and is particularly useful when applied to a case where a borehole extending vertically or horizontally extends straight in the longitudinal direction and continuously measures its inner diameter. Things.

[0002]

2. Description of the Related Art FIG. 10 is an explanatory view showing a state of measuring a bore diameter of a tube using a conventional cylinder gauge. As shown in the figure, conventionally, a manual cylinder gauge 24 having a probe portion 25 at the tip is used, and the probe portion 25 of the cylinder gauge 24 is inserted into the tube hole 23 to be measured, and the inner diameter of the tube hole 23 is measured. I was measuring.

[0003]

However, in the measurement of the bore diameter of the tube using the conventional cylinder gauge as described above,
There were the following problems.

(1) Since measurement is performed using a manual cylinder gauge, when measuring the inner diameter of a large number of pipe holes,
It takes a lot of measurement time. (2) With a general cylinder gauge, it is impossible to measure the inner diameter of the deep portion of a deep tube hole. (3) When a special length and depth cylinder gauge is manufactured and the inner diameter of a deep pipe hole is measured by the special length and depth cylinder gauge, a measurement error is likely to occur.

Accordingly, in view of the above prior art, the present invention provides a probe for measuring the inside diameter of a tube hole which can measure the inside diameter of the tube hole accurately regardless of the depth of the tube hole and which can automatically measure the inside diameter of the tube hole. The task is to provide.

[0006]

A first configuration of a probe for measuring the bore diameter of a pipe according to the present invention, which solves the above-mentioned problems, comprises: a bore diameter measuring means provided at an arbitrary position in a longitudinal direction; And a plurality of elastic portions in the circumferential direction, each of which is in contact with a plurality of circumferential portions of the inner wall surface of the tube hole, and the elastic force of the elastic portion causes the axis of the probe main body to be aligned with the axis of the tube hole. And a shaft main body adjusting means for matching the probe body.

[0007] The second configuration is the same as the first configuration,
The pipe hole inner diameter measuring means, a U-shaped distortion plate whose both ends are in contact with the inner wall surface of the pipe hole on both radial sides of the pipe hole,
And a strain gauge attached to the strain plate.

[0008] The third configuration is the same as the second configuration,
Two strain plates are provided substantially orthogonal to each other, and a strain gauge is attached to each of the strain plates.

A fourth configuration is characterized in that, in the second or third configuration, small ball bearings are provided at both ends of the strain plate.

[0010] In a fifth configuration, in the first, second, third or fourth configuration, at the base end of the probe main body,
One connecting portion is loosely fitted inside the other connecting portion, and a protrusion formed on the outer periphery of the one connecting portion is loosely fitted into a hole formed in the other connecting portion, or the other connecting portion. The protrusion formed on the inner periphery of the first connection portion is loosely fitted in the hole formed in the one connection portion, and the one connection portion and the other connection portion are connected.

Therefore, according to the probe of the first configuration, when the probe body is inserted into the tube hole to be measured, the elastic force of the shaft center adjusting means and the axis of the tube hole and the axis of the probe body. The core matches. Therefore, regardless of the depth of the pipe hole, the inner diameter of the pipe hole can be accurately measured by the pipe hole inner diameter measuring means.

Further, according to the probe for measuring the bore diameter of the pipe of the second configuration, the configuration is simplified by configuring the bore diameter measuring means with the strain plate and the strain gauge.
A minute mechanical change corresponding to the inner diameter of the tube hole can be detected as an electric signal. That is, when the probe main body is inserted into the tube hole to be measured, both ends are pressed against the inner wall surface of the tube hole, so that the strain plate is distorted, and the strain gauge is accordingly distorted. Therefore, the electric resistance of the strain gauge changes according to the amount of strain of the strain plate. Therefore, by connecting this strain gauge to a predetermined electric circuit, an electric signal corresponding to the above-mentioned strain amount (that is, the inside diameter of the tube hole) can be obtained.

Further, according to the probe for measuring the bore diameter of the tube having the third configuration, the two strain plates are provided substantially perpendicular to each other, and the strain gauges are attached to the respective strain plates, so that the strain plates are substantially perpendicular to each other. It is possible to simultaneously measure the inner diameter of the pipe hole in two directions.

According to the probe for measuring the bore diameter of the borehole having the fourth configuration, the probe main body can be smoothly inserted into the borehole by providing the small ball bearings at both ends of the strain plate.

Further, according to the probe for measuring the bore diameter of the tube having the fifth configuration, at the base end of the probe main body, one of the connecting portions is loosely fitted inside the other connecting portion, and the projections formed respectively. The probe body is rotatable in an arbitrary direction because the one coupling portion and the other coupling portion are coupled by loosely fitting the hole and the hole. Therefore, even if the guide hardware or the like coupled via the coupling portion swings, the influence is absorbed by the coupling portion and does not reach the probe body.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a partially cutaway side view of a probe main body of a borehole measuring probe according to an embodiment of the present invention, and FIG. 2A is a front view showing a configuration of a front stabilizer portion of the probe main body. FIG. 2B is a side view of an upper half cutaway showing a configuration of a front stabilizer portion of the probe main body. FIG. 3A is a cross-sectional view showing a configuration of a tensioner portion and a spring plunger portion of the probe main body. FIG. 3B is a side view showing the configuration of a tensioner portion and a spring plunger portion of the probe main body, and FIG.
FIG. 5 is a side view showing a configuration of a strain plate of the probe body, FIG. 5 is a perspective view showing a configuration of a strain plate portion of the probe body, FIG. 6 is an exploded perspective view of a strain plate support and a strain plate holder of the probe body. FIG. 7A is a longitudinal sectional view showing a configuration of a coupling portion between a rear support of the probe main body and a plug holder, and FIG.
FIG. 8B is a vertical cross-sectional view showing a state in which a coupling portion between the rear support of the probe main body and the plug holder is rotated, and FIG. 8 is an explanatory view showing an image when the axis of the probe main body is shifted. 9 is an explanatory diagram of a measurement error.

As shown in FIG. 1, a probe 30 for measuring the bore diameter of a tube has a probe main body 31. Four longitudinal positions of the probe main body 31 are used as shaft center adjusting means.
The front stabilizer 2, the front stabilizer 4, the tensioner 10, and the spring plunger 13 are provided separately from each other. Each of these has a plurality of elastic portions in the circumferential direction, and the elastic force of the elastic portions matches the axis of the probe main body 31 with the axis of the tube hole.

More specifically, as shown in FIGS. 1 and 2,
Each of the front stabilizers 2 and 3 is a truncated conical member made of an elastic material (nylon 66 or the like), and has a plurality of cuts 2a and 4a in the circumferential direction, and is divided into a plurality of elastic portions 2b and 4b. ing. One front stabilizer 2 is sandwiched between a cut portion 3a of the front support 3 and an end surface 1a of a conical nut 1 screwed to one end of the front support 3, and the other front stabilizer 4 is , Front support 3 cut 3b
And the end face 5 a of the strain plate holder 5 screwed to the other end of the front support 3.

Each of the shearing portions 2b and 4b of the front stabilizers 2 and 3 has an elastic force in a direction perpendicular to the axis of the probe main body 31 as shown by an arrow in FIG. 2B. When the probe body 31 is inserted into the tube hole,
The abutment comes into contact with the inner wall surface of the tube hole, and acts to match the axis of the tube hole with the axis of the probe main body 31 by the elastic force.

As shown in FIGS. 1 and 3, the tensioner 10 is a letter-shaped member made of an elastic material (nylon 66 or the like), and is disposed at four locations in the circumferential direction. 3 is fixed to the plate holder 11 and FIG.
(B) has an elastic force in a direction perpendicular to the axis of the probe main body 31 as shown by an arrow in FIG. The spring plunger 13 includes a spherical member 13a and the spherical member 1a.
3a and a spring 13b coupled to the
It is provided at four locations in the circumferential direction, and has elastic force in a direction perpendicular to the axis of the probe main body 31 as shown by arrows in FIG. Moreover, as shown in FIG.
The tensioner 10 and the spring plunger 13
They are arranged alternately in the circumferential direction.

Therefore, when the probe body 31 is inserted into the tube hole, the tensioner 10 and the spring plunger 13 (spherical member 13a) abut against the inner wall surface of the tube hole at eight locations in the circumferential direction. Thus, the axis of the tube hole and the axis of the probe main body 31 are matched.

Further, as shown in FIG.
Distortion plates 6A and 6B are provided at the center of 1 so as to face each other.

As shown in FIGS. 4A and 4B, the strain plate 6
A and 6B are U-shaped members. At the center of the strain plates 6A and 6B, strain gauges 19A and 19B for detecting the strain of the strain plates 6A and 6B are attached, and coatings 20A and 20B are applied.
Small ball bearings 9A and 9B are rotatably provided at both ends of A and 6B via pins 21A and 21B. Incidentally, 18A and 18B in FIG. 4 are strain gauges 19A and 19B.
B is a distortion signal transmission cable connected to B.

As shown in FIG. 5, the strain plates 6A and 6B include a strain plate holder 5, strain plate supports 7A and 7B, and a strain plate support 8 respectively.
And the strain plate holder 11 are supported so as to be orthogonal to each other.

That is, as shown in FIG.
A, 7B and the strain plate supports 8A, 8B are connected by screws 34, and the strain plate supports 8A, 8B and the strain plate holder 11 are connected.
Are connected by screws 35, and the strain plate support 7
A and 7B are connected to the strained plate holder 5 by screws (not shown), and one strained plate 6A has its base end held by the notch 5b of the strained plate holder 5 as shown in FIG. The distal end side is sandwiched between the strain plate supports 7A and 7B, and the other strain plate 6B has the base end side held by the notch 11a of the strain plate holder 11, and has the distal end side formed with the strain plate supports 8A and 8B. It is sandwiched between.

Therefore, when the probe main body 31 is inserted into the tube hole, the small ball bearing 9A provided on one strain plate 6A is
The other strain plate 6 is in contact with the inner wall surface of the pipe hole on both sides in the radial direction.
The small ball bearing 9B provided in B abuts on the inner wall surface of the tube hole on both sides in the other radial direction orthogonal to the radial direction.

As shown in FIG. 5, the pins 21A, 2A
1B are respectively fitted in grooves 7a formed in the circumferential direction of the strain plate supports 7A and 7B, so that they can slide in the radial direction, while moving in the front-back direction (left-right direction in the figure). Regulated. As a result, the small ball bearings 9A,
9B restricts the movement of the small ball bearings 9A and 9
The occurrence of measurement errors due to the movement of B in the front-back direction is suppressed.

Further, as shown in FIG.
At the base end of the connector 1, a male connector (not shown) fixed to the plug holder 14 and a female connector (not shown) fixed to the holder 16 are detachably connected. Distortion signal transmission cables 18A and 18B connected to 19A and 19B and distortion signal transmission cables 18 connected to a measuring device (electric circuit) not shown are electrically connected. The holder 16 is fixed to an end of a long guide metal member 17 with a screw 36. By screwing the holder 16 and the rear nut 15, the male and female connectors of the connector are held so as not to come off. At the same time, the guide hardware 17 is connected to the base end of the probe main body 31.

At the base end of the probe body 31, the rear support 12 and the plug holder 14 are connected as shown in FIG. That is, the end portion 12a of the rear support 12 is loosely fitted inside the end portion 14a of the plug holder 14, and the head of the screw 22 screwed to four places on the outer periphery of the end portion 12a of the rear support 12 (that is, the protrusion). The rear support 12 and the plug holder 14 are connected to each other by loosely fitting the respective portions into the holes 14b formed at four places in the circumferential direction of the end 14a of the plug holder 14. Accordingly, as shown in FIG. 7B, the probe main body 31 can rotate in any direction within the range of the angle θ. Note that the rear support 12 and the strain plate holder 11 are connected by screws 33.

Therefore, according to the tube hole inner diameter measuring probe having the above configuration, when the probe body 31 is inserted into the tube hole to be measured, the front stabilizers 2, 4 provided on the probe body 31, the tensioner 10, and the spring plunger 13 are provided. , The axis of the probe main body 31 and the axis of the tube hole coincide with each other.

For example, as shown in FIG. 8, when the probe main body 31 is inclined upward in the tube hole, the front stabilizers 2, 4 on the distal end side have large and middle elastic forces on the upper side, and have lower elastic forces on the front stabilizers 2, 4. It will be small. On the other hand, in the tensioner 10 and the spring plunger 13 on the proximal end side, the lower elastic force is large and medium, and the upper elastic force is small. Therefore, the probe body 31
Of the probe body 3
The axis of the shaft 1 coincides with the axis of the tube hole.

Then, with the axis of the probe body 31 and the axis of the tube hole aligned in this manner, the strain plates 6A, 6A
The inner diameter of the tube hole is measured by B and the strain gauges 19A and 19B. That is, the small ball bearings 9A, 9 of the strain plates 6A, 6B
When B comes into contact with the inner wall surface of the tube hole, the strain plates 6A and 6B are distorted by an amount corresponding to the inner diameter of the tube hole. Along with this, the strain gauges 19A and 19B are also distorted and their electric resistance changes. Therefore, by connecting these strain gauges 19A, 19B to the measuring device (electric circuit) via the strain signal transmission cables 18A, 18B, 18, the strain plate 6
An electric signal corresponding to the distortion amount of A, 6B (that is, the inner diameter of the tube hole) is obtained.

As described above, the centripetality of the probe main body 31 can be enhanced to eliminate its inclination and eccentricity, and accurate measurement can be performed. For example, as shown in FIG. 9, when the probe main body 31 is inclined (inclination angle α), when the actual bore diameter is 1, the measured bore diameter is 1 / cos α.
This causes a measurement error, but if the probe main body 31 is not inclined (α = 0), the inner diameter of the measured tube hole becomes 1, and the measurement can be performed with high accuracy. Moreover, since the long guide metal member 17 is connected, the probe main body 31 is connected.
Can be continuously measured by inserting the probe deep into the pipe hole, but also at this time, the inclination and eccentricity of the probe main body 31 can be suppressed by the front stabilizers 2, 4 and the like, and accurate measurement can be performed. . That is, it is possible to accurately measure the inner diameter of the tube hole regardless of the depth of the tube hole.

In addition, since an electric signal corresponding to the inner diameter of the tube hole can be obtained, the inner diameter of the tube hole can be automatically measured, and the time required for the measurement can be greatly reduced.

Further, two strain plates 6A and 6B are provided so as to be orthogonal to each other, and strain gauges 19A and 19B are provided on each of the strain plates 6A and 6B.
By providing B, the inner diameters of the tube holes in two orthogonal directions (for example, the horizontal direction and the vertical direction) can be measured simultaneously. When the probe main body 31 is tilted for some reason or when one of the measurement signals is abnormal due to a defect such as a strain gauge, a difference occurs between the values of the two measurement signals. Therefore, by comparing the two measurement signals, it can be determined that the inclination or the problem has occurred, and the reliability of the borehole inner diameter measurement can be further improved.

At the base end of the probe main body 31, the end 12a of the rear support 12 is loosely fitted inside the end 14a of the plug holder 14, and the projections (heads of the screws 22) formed at the ends are formed. The rear support 12 and the plug holder 14 are connected by loosely fitting the hole 14b, so that the probe main body 31 can rotate in an arbitrary direction. The influence is absorbed at the joint between the rear support 12 and the plug holder 14 and does not reach the probe main body 31 side. For this reason, measurement instability can be suppressed, and measurement can be performed with higher accuracy.
To prevent the probe main body 31 from being damaged.

The rear support 12 and the plug holder 1
The coupling portion with 4 is not limited to the above configuration. That is, contrary to the above, the end 14 of the plug holder 14
a may be loosely fitted inside the end portion 12a of the rear support 12, or a protrusion may be formed on the outer inner periphery and a hole may be formed on the inner side, and the protrusion and the hole may be loosely fitted. You may make it do.

Further, since the small ball bearings 9A and 9B are provided at both ends of the strain plates 6A and 6B, the probe main body 31 can be smoothly inserted into the tube hole, and the measurement can be stabilized.

Further, since the nut 1 at the tip is made conical, the probe body 31 can be easily inserted into the tube hole.

[0041]

As described above in detail with the embodiment of the present invention, according to the tube bore diameter measuring probe of the present invention, the centripetality of the probe main body is enhanced by providing the shaft center adjusting means. The inclination and the eccentricity can be eliminated, and the accurate measurement of the bore diameter of the pipe hole can be performed. Such an effect can be obtained regardless of the depth of the pipe hole.

Further, since the bore diameter measuring means is provided with a strain plate and a strain gauge, the configuration is simple and an electric signal corresponding to the bore diameter can be obtained. Automatic measurement becomes possible, and the time required for measurement can be significantly reduced.

In addition, the two strain plates are provided substantially orthogonal to each other, and the strain gauges are attached to each of the strain plates, so that the inner diameters of the tube holes in two directions substantially orthogonal to each other can be measured simultaneously. Therefore, by comparing the two measurement signals, it is possible to further enhance the reliability of the measurement of the inner diameter of the pipe hole.

Further, by providing small ball bearings at both ends of the strained plate, the probe body can be smoothly inserted into the tube hole, and the inner diameter measurement of the tube hole can be stabilized.

At the base end of the probe main body, one of the connecting portions is loosely fitted inside the other connecting portion, and the protrusions and holes formed respectively are loosely fitted so that one connecting portion and the other can be loosely fitted. Even if the guide hardware or the like coupled through the coupling portion swings due to coupling with the coupling portion, the influence is absorbed by the coupling portion and does not reach the probe main body side. For this reason, measurement instability can be suppressed, the borehole inner diameter can be measured more accurately, and stress applied to the probe body can be absorbed to prevent damage to the probe body.

[Brief description of the drawings]

FIG. 1 is a side view showing a probe body of a probe for measuring the bore diameter of a tube according to an embodiment of the present invention, with a probe body partially cut away.

FIG. 2A is a front view showing a configuration of a front stabilizer portion of the probe main body, and FIG. 2B is a side view of an upper half cutaway showing a configuration of a front stabilizer portion of the probe main body.

FIG. 3A is a cross-sectional view showing a configuration of a tensioner portion and a spring plunger portion of the probe main body.
(B) is a side view showing a configuration of a tensioner portion and a spring plunger portion of the probe main body.

FIG. 4 is a side view showing a configuration of a strain plate of the probe main body.

FIG. 5 is a perspective view showing a configuration of a distortion plate portion of the probe main body.

FIG. 6 is an exploded perspective view of a strain plate support and a strain plate holder of the probe main body.

FIG. 7A is a vertical cross-sectional view showing a configuration of a coupling portion between a rear support of the probe main body and a plug holder, and FIG. 7B is a view when a coupling portion between the rear support of the probe main body and the plug holder is rotated. It is a longitudinal cross-sectional view which shows the state.

FIG. 8 is an explanatory diagram showing an image when the axis of the probe main body is displaced.

FIG. 9 is an explanatory diagram of a measurement error.

FIG. 10 is an explanatory view showing a state of measuring a bore diameter of a pipe hole using a conventional cylinder gauge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nut 1a End surface 2, 4 Front stabilizer 2a, 4a Cut 2b, 4b Elastic part 3 Front support 3a, 3b Cut part 5, 11 Distortion plate holder 5a End part 5b, 11a Notch part 6A, 6B Distortion plate 7A, 7B, 8A, 8B Distorted plate support 7a Groove 9A, 9B Small ball bearing 10 Tensioner 12 Rear support 12a End 13 Spring plunger 13a Spherical member 13b Spring 14 Plug holder 14a End 14b Hole 15 Rear nut 16 Holder 17 Guide hardware 18A, 18B, 18 Cable for transmitting strain signal 19A, 19B Strain gauge 20A, 20B Coating 21A, 21B Pin 22, 32, 33, 34, 35, 36 Screw 30 Pipe bore diameter measurement probe 31 Probe body

Claims (5)

[Claims] 1. A borehole inner diameter measuring means provided at an arbitrary position in a longitudinal direction, and a plurality of elastic portions provided at a plurality of locations in a longitudinal direction at a distance and each having a plurality of elastic portions in a circumferential direction. A probe main body comprising: a shaft main body adjusting means for abutting against a plurality of locations in the circumferential direction of the wall surface to make the axis of the probe main body coincide with the axis of the tube main body by its elastic force. Measurement probe. 2. The tube hole inner diameter measuring probe according to claim 1, wherein the tube hole inner diameter measuring means has a U-shaped strained plate having both ends abutting on the inner wall surface of the tube hole on both radial sides of the tube hole. When,
A probe for measuring the bore diameter of a tube hole, comprising: a strain gauge attached to the strain plate. 3. The probe according to claim 2, wherein two strain plates are provided substantially orthogonal to each other, and strain gauges are attached to each of the strain plates. Tube bore inner diameter measurement probe. 4. The borehole inner diameter measurement probe according to claim 2, wherein small ball bearings are provided at both ends of the strain plate. 5. The probe according to claim 1, 2, 3 or 4, wherein at a base end of the probe main body, one coupling portion is loosely fitted inside the other coupling portion, and The protrusion formed on the outer periphery of the one connection portion was loosely fitted into the hole formed on the other connection portion, or the protrusion formed on the inner periphery of the other connection portion was formed on the one connection portion. A probe for measuring the inner diameter of a tube hole, wherein said one connecting portion and said other connecting portion are loosely fitted in a hole and connected to said other connecting portion.