JP2013092505A - Piping thickness measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping thickness measurement device capable of precisely and continuously measuring a thickness of piping to be inspected.SOLUTION: A piping thickness measurement device includes a carriage 10b which travels in piping 10a to be inspected; an XY table 130 which is provided to the carriage 10b, and faces in a direction orthogonal to the axial center of the piping 10a; a turntable 131 which is provided to a moving cradle 157 moved and adjusted in X, Y directions by the XY table 130; a plurality of probe mount bases 132 which are provided movable while being pressed outward in a radial direction with the center of rotation of the turntable 131 as a standard; an ultrasonic probe 133 which is mounted on each of the probe mount bases 132, and measures a thickness of the piping 10a; distance sensors 134 each of which measures a distance from the center of rotation of each of the probe mount bases 132; and control means for driving the XY table 130 on the basis of the measured value from the respective distance sensors 134 to align the center of rotation of the turntable 131 with the axial center of the piping 10a.

Description

The present invention relates to a pipe thickness measuring apparatus that measures the thickness of a pipe that is an inspection object using ultrasonic waves.

Conventionally, the inspection for evaluating the soundness of pipes has mainly been a method in which an inspector measures the thickness with ultrasonic waves only at points determined from the outside of the pipe.
However, with this method, it is easy to overlook local flaws and thinning, and the shape and distribution cannot be accurately grasped. In addition, the reliability of the inspection depends on the skill of the inspector. In addition, for the inspection, it is necessary to remove the heat insulating material that covers the outside of the pipe, to construct a scaffold, and the cost increases.
Thus, for example, Patent Document 1 discloses that a work cart provided with magnet wheels capable of self-running while adsorbing to the inner surface of the pipe (hereinafter simply referred to as a magnet cart) while running on the inner surface of the pipe, An apparatus for measuring is disclosed. Note that the thickness of the pipe is measured while rotating the arm provided with the ultrasonic probe around the magnet carriage in the circumferential direction of the pipe.

Japanese Patent Laid-Open No. 2001-12934 (FIG. 5)

However, the magnet carriage is configured to travel while being attracted to the inner surface of the pipe by magnetic force, and the pivot center position of the arm is different from the axial center position of the pipe. Thus, it is necessary to extend and contract the arm with respect to the magnet carriage while rotating the arm in the circumferential direction of the pipe. For this reason, the moving speed of the ultrasonic probe that moves on the inner surface of the pipe changes, and the pressing of the ultrasonic probe on the inner surface of the pipe is not always performed radially from the axis of the pipe and becomes unstable. As a result, the accuracy of pipe thickness measurement may be reduced.
In order to solve the above problems, it is conceivable to increase the size of the magnet carriage and match the pivot center position of the arm with the axial center position of the pipe. It is necessary to prepare a magnetic cart and arm, which increases the manufacturing cost. Further, when the scale of the magnet carriage is increased, it is necessary to increase the magnetic force of adsorption so that the magnet carriage does not fall from the inner surface of the pipe.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pipe thickness measuring device that can continuously and accurately measure the thickness of a pipe as an inspection object.

A pipe thickness measuring device according to the present invention that meets the above-mentioned object is a cart that travels in a pipe that is an inspection object,
An XY table provided at a front end portion or a rear end portion of the carriage and provided in a direction orthogonal to the axis of the pipe;
A rotary table provided on a moving base that is adjusted and moved in the X and Y directions by the XY table;
A plurality of probe mounts provided so as to be movable in a pressed state radially outward with respect to the rotation center of the rotary table;
An ultrasonic probe mounted on each of the probe mounting bases and measuring the thickness of the pipe;
A distance sensor for measuring a distance from the rotation center of each probe mounting base;
Control means for driving the XY table based on the measured values from the distance sensors to align the rotation center of the rotary table with the axis of the pipe.

In the pipe thickness measuring apparatus according to the present invention, it is preferable that four probe mounting bases are provided at an equal angle with the rotation center of the rotary table as the center.

In the pipe thickness measuring apparatus according to the present invention, it is preferable that each probe mounting base is provided with a wheel for running the probe mounting base along the inside of the pipe.
Here, each probe mounting base is preferably provided with a water supply port for supplying water as a medium between the ultrasonic probe and the inner wall of the pipe.

In the pipe thickness measuring device according to the present invention, the carriage has three or more drive carriages arranged in series each having front and rear wheels, and a connection mechanism having an arm for connecting the adjacent drive carriages. Each drive carriage can travel between the two surfaces while being stretched in a V shape by the arm according to the distance between the two opposite surfaces of the pipe.
Here, it is preferable that the front and rear wheels of each drive carriage are provided with a steering mechanism, and the traveling direction of each drive carriage is changed.

The pipe thickness measuring device according to the present invention includes a carriage, an XY table, a rotary table, a plurality of probe mounting bases, an ultrasonic probe, a distance sensor, and a control means. Based on this, the XY table is driven so that the rotation center of the rotary table coincides with the axis of the pipe. Therefore, when measuring the thickness of the pipe, each probe mounting base is rotated in the circumferential direction of the pipe according to the measurement location. Even if it is moved, the moving speed of the ultrasonic probe moving on the inner surface of the pipe can be made substantially constant, and the ultrasonic probe is constantly pressed radially from the axis of the pipe to the inner surface of the pipe. be able to. Furthermore, each probe mounting base is provided so that it can be moved in a pressed state radially outward with respect to the rotation center of the rotary table, so multiple types of pipe thickness measuring devices are prepared according to the inner diameter of the pipe. Therefore, the manufacturing cost can be reduced.
Therefore, the thickness of the pipe as the inspection object can be continuously measured with high accuracy.

In addition, when four probe mounts are provided at an equal angle with the rotation center of the rotary table as the center, a pair of probe mounts opposed to each other with the rotation center as the center are Since it is arranged at the maximum inner diameter position (diameter position) of the pipe, the pressing state of each probe mounting base to the inner surface of the pipe can be stably maintained, and the measurement accuracy can be further improved. In addition, by providing four probe mounting tables at an equal angle, the thickness of the entire circumference of the pipe can be measured by setting the rotation angle of the rotary table to about 90 degrees, so that the measurement time can be shortened.

When each probe mounting base is provided with wheels that run the probe mounting base along the inside of the pipe, each probe mounting base can smoothly move on the inner surface of the pipe. . As a result, for example, the problem that the probe mounting base is caught by the unevenness generated on the inner wall of the pipe can be suppressed, so that the measurement accuracy can be improved.
Here, if each probe mounting base is provided with a water supply port for supplying water as a medium between the ultrasonic probe and the inner wall of the pipe, the permeability of the ultrasonic wave to the pipe The measurement accuracy can be improved and the measurement accuracy can be improved.

Further, the carriage has three or more drive carriages arranged in series and a connection mechanism including an arm for connecting the carriages, and each drive carriage uses the arm according to the interval between two opposing surfaces of the pipe. When traveling between two surfaces while stretching in a V shape, the carriage can accommodate pipes of various widths and can travel within the pipe without being affected by the pipe material.
Here, when the steering mechanism is provided on the wheel of each drive carriage, for example, even if the carriage running in the pipe is inclined, all the wheels are rotated (rolled) to correct the inclination of the carriage. Thus, the rotation center of the rotary table can be matched with the axis of the pipe.

(A) is a perspective view of the pipe thickness measuring apparatus which concerns on one embodiment of this invention, (B) is a front view of the same pipe thickness measuring apparatus. It is a side view of the same pipe thickness measuring apparatus. It is a top view of the same pipe thickness measuring apparatus. It is a perspective view of the 3rd drive trolley which comprises the trolley | bogie of the same pipe thickness measuring apparatus. (A), (B) is the top view and side view of a 3rd drive trolley, respectively. (A)-(C) are the top view, front view, and side view of the drive mechanism of the 3rd drive trolley, respectively. (A)-(C) are the side view of the trolley | bogie main body of the 3rd drive trolley | bogie, a front view, respectively, and the sectional view on the aa arrow of (A). (A), (B) is the perspective view of the connection means attached to the 3rd drive trolley, respectively, and a front view. (A), (B) is a side view of the said connection means, respectively, bb arrow sectional drawing of (A). It is a perspective view of the 2nd drive trolley which comprises the trolley | bogie of the piping thickness measuring apparatus which concerns on one embodiment of this invention. (A) and (B) are a plan view and a side view of the second drive carriage, respectively. (A)-(C) are the top view, front view, and side view of the drive mechanism of the said 2nd drive cart, respectively. (A)-(C) are the side view, front view, and cc arrow sectional drawing of (A) respectively of the trolley | bogie main body of the 2nd drive trolley | bogie. (A), (B) is the perspective view of the connection means attached to the said 2nd drive trolley, respectively, and a top view. (A), (B) is the dd arrow directional cross-sectional view and ee arrow directional cross-sectional view of FIG.14 (B), respectively. It is a perspective view of the thickness measurement means of the pipe thickness measuring device concerning one embodiment of the present invention. It is a perspective view of the XY table and rotary table of the same thickness measuring means. It is a front view of the XY table and rotary table of the same thickness measuring means. It is a perspective view of the probe mounting base of the same thickness measuring means. It is explanatory drawing of the positioning method of the rotary table of the same thickness measurement means.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 to 20, a pipe thickness measuring device (hereinafter also simply referred to as a measuring device) 10 according to an embodiment of the present invention continuously and accurately measures the thickness of a pipe 10 a that is an inspection object. It is a device that can measure automatically. This will be described in detail below.

As shown in FIGS. 1 to 3, the pipe thickness measuring device 10 includes a carriage 10b that travels in the pipe 10a and a wall thickness measuring means 10c provided on the front side of the carriage 10b.
The carriage 10b connects three first to third drive carriages 13 to 15 arranged in series with wheels 11 and 12 on the front and rear, respectively, and the adjacent first drive carriage 13 and second drive carriage 14. And a connecting mechanism 19 including arms 16 and 17 for connecting the adjacent second driving carriage 14 and the third driving carriage 15 to each other. The drive carriages 13 to 15 travel in the pipe 10a while being stretched in a V shape by the arms 16 and 17 according to the inner diameter of the pipe 10a.
In the present embodiment, the front side of the measuring device 10 (cart 10b) is the first driving cart 13 side and the rear side is the third driving cart 15 side, which is the front-rear direction of the measuring device 10, or The direction orthogonal to this will be described below as the left-right direction.

As shown in FIGS. 1A, 1B, 2 and 3, the first and third drive carriages 13 and 15 constituting the measuring apparatus 10 are arranged on both sides (front side) of the second drive carriage 14. The wheels 11 and 12 of the first and third drive carriages 13 and 15 are pressed onto the lower surface (one face) 20 on the inner side of the pipe 10a, and the second drive carriage 14 is arranged. These wheels 11 and 12 are pressed on the upper surface (other surface) 21 facing the lower surface 20 of the pipe 10a.
The first drive carriage 13 is provided with the thickness measuring means 10c on the front side, and the third drive carriage 15 is not provided with the thickness measurement means 10c, but the configuration is substantially the same. Only the third drive carriage 15 will be described.
As shown in FIGS. 4 to 9, the third drive carriage 15 includes a carriage body 22 to which various measuring means (not shown) can be attached, and wheels 11 and 12 attached to the lower and front sides of the carriage body 22. The third drive carriage 15 and the second drive carriage 14 are connected by a connecting mechanism 19.

As shown in FIG. 1B, the tire 23 constituting each of the wheels 11 and 12 is made of rubber, for example, and the cross-sectional shape of the grounding surface of the tire 23 is the same as the cross-sectional shapes of the lower surface 20 and the upper surface 21 of the pipe 10a. The shape is substantially the same (arc shape). The tire 23 is not limited to rubber as long as it has a high frictional resistance, and if it has elasticity, the contour shape of the tire need not be the same as the inner surface of the pipe.
As shown in FIGS. 4, 5 (A), (B), and FIGS. 6 (A) to (C), the shaft 24 attached to each wheel 11, 12 has an inverted U-shape when viewed from the front. The fixed base 25 is rotatably attached via a bearing 26. A drive mechanism 29 having a drive motor (for example, a DC motor) 27 and a transmission means (reduction gear) 28 for transmitting the output of the drive motor 27 to the wheels 11 and 12 is connected to the shaft 24. .

The transmission means 28 includes a worm wheel 30 attached to the front side of the shaft 24, a worm gear 31 screwed into the worm wheel 30, a spur gear 32 attached to the output shaft of the drive motor 27, and the spur gear 32. And the bevel gears 34 and 35 for transmitting the output of the spur gear 33 to the worm gear 31. Thereby, the transmission means 28 is made compact. Note that the configuration of the drive mechanism is not limited to this.
With this configuration, the output from the drive motor 27 can be transmitted to the wheels 11 and 12 via the transmission means 28 and rotated. For this reason, each wheel 11 and 12 provided in the 3rd drive trolley 15 drives by the independent drive mechanism 29, respectively.
In addition, a rotating upper part 36 and a rotating lower part 37 for rotatably mounting the fixing base 25 to the carriage main body 22 are provided at the upper part of the fixing base 25, and in the meantime, the third driving carriage 15 is arranged in the vertical direction. A worm wheel 38 having an axial center is attached. Further, a stopper 39 for determining the rotation angle of the fixed base 25 is provided at a position different from the worm wheel 38.

As shown in FIGS. 4, 5, and 7 </ b> A to 7 </ b> C, the carriage main body 22 includes an upper plate portion 40 and a lower plate portion 41 that are opposed to each other with a gap therebetween.
A through hole 42 to which the upper rotating portion 36 of the fixing base 25 of the wheels 11 and 12 is attached is formed in front and rear of the upper plate portion 40, and a lower rotating portion 37 of the fixing base 25 is formed in front and rear of the lower plate portion 41. Are formed, and a guide hole 44 through which the stopper 39 of the fixed base 25 moves is formed.
The guide hole 44 is formed in a 7/24 arc shape, and the rotation angle of the fixed base 25 that rotates about the axis of the worm wheel 38 is set to the initial position (the position at which the third drive carriage 15 is advanced in the front-rear direction). ) To one side and 90 ° to the other side (position where the third drive carriage 15 is advanced in the left-right direction). The shape of the guide hole is not limited to this, and for example, it may be formed in a 1/2 arc shape (semi-arc shape) with ± 90 degrees centered on the initial position.

A steering motor (for example, a DC motor) 47 to which a worm gear 46 is attached via a coupling 45 is disposed between the upper plate portion 40 and the lower plate portion 41. The worm gear 46 is screwed into a worm wheel 38 attached to the fixed base 25.
Further, the axis of the front steering motor 47 is attached to be inclined with respect to the front-rear direction of the carriage main body 22, and the axis of the rear steering motor 47 is in the same direction as the front-rear direction of the carriage main body 22. As installed. The first drive carriage 13 is reverse to the third drive carriage 15 in the front-rear direction.
The upper and lower rotating portions 36 and 37, the worm wheel 38, the stopper 39, the through holes 42 and 43 of the upper plate portion 40 and the lower plate portion 41, the guide holes 44, and the worm gear 46 are attached. The steering motor 47 constitutes a steering mechanism.

Each steering mechanism is individually provided on the front and rear wheels 11, 12 of the third drive carriage 15, and moves the stopper 39 of the fixed base 25 to either one end of the guide hole 44, thereby The traveling direction of the drive carriage 15 is set to the front-rear direction or the left-right direction. However, for example, by arranging a sensor, the rotation angle of the fixed base 25 can be arbitrarily adjusted, and the third drive carriage 15 can be advanced in an oblique direction.
With this configuration, the steering motor 47 is operated and the worm gear 46 is rotated forward or reverse, whereby the fixed base 25 is rotated and the traveling direction of the third drive carriage 15 can be changed. .
Note that a potentiometer (an example of a front-rear direction attitude detector) 48 that detects the front-rear direction inclination of the traveling third drive carriage 15 is provided on the upper surface of the lower plate portion 41. This potentiometer 48 is a conventionally known sensor, and is a sensor that detects a tilt with respect to the horizontal direction by attaching a balance to a single-rotation potentiometer without a rotation limit.

Next, the second drive carriage 14 will be described with reference to FIGS. 10 to 15. The second drive carriage 14 has basically the same configuration as the third drive carriage 15 described above. Therefore, the same number is attached | subjected to the same member, and detailed description is abbreviate | omitted.
As is apparent from FIGS. 10, 11 (A), (B), and FIGS. 12 (A) to (C), the drive mechanism of the second drive carriage 14 is the drive used for the third drive carriage 15. The structure is the same as that of the mechanism 29, and only the arrangement position is different. For this reason, according to this, the shape of the fixed base 50 used for the second drive carriage 14 is different from that of the fixed base 25 used for the third drive carriage 15.
A pulley 51 is attached to the shaft 24 of one of the wheels 11 and 12, and a rotary encoder (distance measuring means) 53 to which a pulley 52 is attached is attached to the fixed base 50 at an upper position thereof. It has been. These pulleys 51 and 52 are connected via a pulley belt 54, whereby the travel distance of the second drive carriage 14, that is, the measuring device 10 can be measured.

As is clear from FIGS. 10, 11, and 13 (A) to (C), the carriage body 22 of the second drive carriage 14 has the same configuration as the carriage body 22 used for the third drive carriage 15. It has become.
On the upper surface of the lower plate portion 41 of the carriage main body 22, a potentiometer (an example of a lateral attitude detector) 55 for detecting the horizontal inclination of the second drive carriage 14 is further provided. The potentiometer 55 has the same configuration as that of the potentiometer 48 that detects the inclination in the front-rear direction, and its direction is set to a direction orthogonal to the potentiometer 48.
The potentiometer 55 for detecting the tilt in the left-right direction may be provided not only in the second drive carriage 14 but also in one or both of the first drive carriage 13 and the third drive carriage 15, Instead of being provided in the second drive carriage 14, it may be provided in either one or both of the first drive carriage 13 and the third drive carriage 15.

Next, a connection mechanism 18 that connects the first drive carriage 13 and the second drive carriage 14 and a connection mechanism 19 that connects the second drive carriage 14 and the third drive carriage 15 will be described.
As shown in FIGS. 1 to 3, the connection mechanism 19 includes a connection means 60 attached to the third drive carriage 15, a connection means 61 attached to the second drive carriage 14, and a connection means 60. Arms 16 and 17 are connected to the means 61.
First, the connection means 60 attached to the 3rd drive trolley 15 is demonstrated, referring FIG.4, FIG.5, FIG.8 (A), (B), FIG.9 (A), (B).
A mounting base 62 for the connecting means 60 is provided between the center position of the carriage main body 22 in the front-rear direction, that is, between the front and rear wheels 11, 12.

The mounting base 62 is attached from below the carriage main body 22 so as to sandwich the left-right direction thereof, and a rotating shaft (an arm connecting portion) arranged in the width direction of the carriage main body 22 is provided below the mounting base 62. An example) 63 is rotatably mounted via a bearing 64.
A spur gear 65 is rotatably provided on each of the rotating shafts 63 projecting on both sides of the mounting base 62 via a bearing 66, and a torsion spring (an example of a spring material) 67 whose torsion angle can be adjusted on its front side. Is plugged in. Furthermore, the front sides of the pair of arms 16 and 17 are attached to both ends of the rotating shaft 63 via arm attachment portions 68 and 69.
The tip (one end) of the torsion spring 67 is attached to the fixing part 70 of the arm attaching parts 68 and 69, and the base end (the other end) is attached to the fixing part 71 of the spur gear 65. Note that, normally, the force of the torsion spring 67 acts in a direction in which the arms 16 and 17 tend to be in a vertical state.

The spur gear 65 is connected to a spring adjustment motor (for example, a DC motor) 72 and a transmission means (reduction gear) 73 for transmitting the output of the spring adjustment motor 72 to the spur gear 65.
The transmission means 73 includes a spur gear 74 attached to the output shaft of the spring adjustment motor 72, a spur gear 75 screwed with the spur gear 74, a worm gear 76 attached to the front side thereof, and the worm gear 76. A worm wheel 77 to be screwed and a spur gear 79 provided on a rotating shaft 78 to which the worm wheel 77 is attached. Further, the spur gear 79 is provided with spur gears 80 screwed to the respective spur gears 65 on both sides, and is attached to a central portion of a rotary shaft 82 that is rotatably mounted on a mounting base 62 via a bearing 81. The spur gear 83 is screwed. In addition, the structure of a transmission means is not limited to this.

Thereby, the transmission means 73 can be made compact, and the output from one spring adjusting motor 72 can be transmitted to each torsion spring 67 by decelerating.
Further, a spur gear 84 is attached to the front side of the rotating shaft 78 to which the worm wheel 77 is attached, and a potentiometer (an example of an angle detector) 86 attached to a spur gear 85 that is screwed to the spur gear 84. The torsion angle of the torsion spring 67 is detected.
With this configuration, the output from the spring adjustment motor (for example, DC motor) 72 is transmitted to the torsion spring 67 via the transmission means 73, and the torsion spring 67 is confirmed while the detection value by the potentiometer 86 is confirmed. Adjust the torsion angle. Then, by increasing or decreasing the force applied to the torsion spring 67, the third drive carriage 15 can be pressed against the inner surface of the pipe 10a with a predetermined pressing force.

Subsequently, the connecting means 61 attached to the second drive carriage 14 will be described with reference to FIGS. 10, 11, 14 (A), (B), and FIGS. 15 (A), (B). .
A mounting base 90 for the connecting means 61 is provided at the center position in the front-rear direction of the carriage body 22, that is, between the front and rear wheels 11, 12.
The mounting base 90 is attached from below the carriage main body 22 so as to sandwich the left and right direction thereof, and a rotating shaft (an arm connecting portion) arranged in the width direction of the carriage main body 22 is disposed below the mounting base 90. One example) 91 is rotatably mounted via a bearing.
A spur gear 93 is rotatably provided on each of the rotating shafts 91 projecting on both sides of the mounting base 90 via a bearing 94, and a torsion spring (an example of a spring material) 95 whose torsion angle can be adjusted on its front side. Is plugged in. Furthermore, the front sides of the pair of arms 16 and 17 are attached to both ends of the rotating shaft 91 via arm attachment portions 96 and 97.
The tip (one end) of the torsion spring 95 is attached to the fixing part 98 of the arm attaching parts 96 and 97, and the base end (the other end) is attached to the fixing part 99 of the spur gear 93. Note that, normally, the force of the torsion spring 95 acts in a direction in which the arms 16 and 17 tend to be in a vertical state.

The spur gear 93 is connected to a spring adjustment motor (for example, a DC motor) 100 and a transmission means (reduction gear) 101 for transmitting the output of the spring adjustment motor 100 to the spur gear 93.
The transmission means 101 includes a spur gear 102 attached to the output shaft of the spring adjustment motor 100, a spur gear 103 screwed with the spur gear 102, a worm gear 104 attached to the front side thereof, and a worm gear 104. It has a worm wheel 105 to be screwed and a spur gear 107 provided on a rotary shaft 106 to which the worm wheel 105 is attached. The spur gear 107 is screwed to a spur gear 111 attached to a central portion of a rotating shaft 110 provided with spur gears 108 on both sides and rotatably attached to a mounting base 90 via bearings 109. . Further, the spur gears 108 provided on both sides of the rotating shaft 110 are screwed with the spur gears 112 rotatably provided on the mounting base 90, and the spur gears 112 are screwed onto the spur gears 93. Match. In addition, the structure of a transmission means is not limited to this.

Thereby, the transmission means 101 can be made compact, and the output from one spring adjustment motor 100 can be transmitted to each torsion spring 95.
A pulley 113 is attached to the front side of the rotary shaft 106 to which the worm wheel 105 is attached, and a potentiometer (an example of an angle detector) 115 to which a pulley 114 is attached is mounted on the mounting base 90 above the pulley 113. Installed. These pulleys 113 and 114 are connected via a pulley belt 116, thereby detecting the torsion angle of the torsion spring 95.
With this configuration, the output from the spring adjustment motor (for example, DC motor) 100 is transmitted to the torsion spring 95 via the transmission means 101, and the torsion spring 95 is confirmed while the detection value by the potentiometer 115 is confirmed. Adjust the torsion angle.

Next, a connection mechanism 18 that connects the second drive carriage 14 and the first drive carriage 13 will be described. As shown in FIGS. 1 to 3, the connection mechanism 18 includes a connection means 60 attached to the first drive carriage 13, a connection means 120 attached to the second drive carriage 14, and a connection means 60. Since the arms 16 and 17 are connected to the connecting means 120, only the connecting means 120 will be described.
A rotating shaft (an example of an arm connecting portion) 121 disposed in parallel with a space from the rotating shaft 91 is rotatably attached to a lower portion of the mounting base 90 via a bearing 122.
A spur gear 123 is rotatably provided on each of the rotating shafts 121 protruding on both sides of the mounting base 90 via a bearing 124, and a torsion spring (an example of a spring material) 125 whose torsion angle can be adjusted on the front side. Is plugged in. Furthermore, the front sides of the pair of arms 16 and 17 are attached to both ends of the rotating shaft 121 via arm attachment portions 126 and 127.

The tip (one end) of the torsion spring 125 is attached to the fixing portion 128 of the arm attachment portions 126 and 127, and the base end (the other end) is attached to the fixing portion 129 of the spur gear 123. Note that, normally, the force of the torsion spring 125 acts in a direction in which the arms 16 and 17 tend to be in a vertical state. Each spur gear 123 is screwed into a spur gear 93 constituting the connecting means 61.
With this configuration, by transmitting the output from the spring adjustment motor 100 to the torsion spring 95 via the transmission means 101, the output from the spring adjustment motor 100 is also transmitted to the torsion spring 125. While confirming the detection value by the potentiometer 115, the torsion angles of the torsion springs 95 and 125 are adjusted. A mechanism for adjusting the torsion angle of the torsion spring 125 may be provided separately.
Then, by increasing or decreasing the force applied to the torsion spring 95 and the torsion spring 125, the second drive carriage 14 can be pressed against the inner surface of the pipe 10a with a predetermined pressing force.

As described above, in the present embodiment, the case where the bogie of the measuring apparatus is configured by three driving carts has been described, but the measuring device may be configured by four or more driving carts.
At this time, as long as each driving carriage is stretched in an V shape by the arm according to the interval between the two opposing surfaces of the pipe, the arrangement position of each driving carriage is not particularly limited. For example, in the case of four drive trolleys, if the drive trolleys arranged on both sides are pressed against one surface, two drive trolleys arranged between them may be pressed against the other surface, You may arrange | position each drive trolley on two surfaces alternately at zigzag form.
The facing surfaces are preferably parallel, but if the measuring device can be stretched between the facing surfaces, if the facing surfaces are not parallel, for example, the distance between the facing surfaces toward the traveling direction of the measuring device. The measuring device can also be applied to the case where the voltage gradually narrows or widens.

In addition, the configuration of the bogie of the measuring device is not limited to the above-described configuration. For example, a predetermined tension force is generated without using a torsion spring for pressing the inner surface of the pipe of each drive bogie. In this way, the speed of each drive carriage can be controlled.
Furthermore, the bogie of the measuring device is not limited to the bogie that stretches in the V shape described above, and can be self-propelled while adsorbing to the inner surface of the pipe, for example, as long as the bogie can measure the thickness of the pipe. A cart with magnet wheels can also be used.
Therefore, the pipe thickness measuring device can travel not only in a pipe made of a metal having magnetism but also in a pipe made of another material, for example, a metal having no magnetism, ceramics, plastic, or rubber. The thickness of various pipes can be measured without being affected by the pipe material.

Next, the thickness measuring means 10c provided in the first drive carriage 13 will be described with reference to FIGS. 1 (A), (B), FIG. 2, FIG. 3, and FIGS.
The thickness measuring means 10c includes an XY table 130, a rotary table 131, a plurality of probe mounting bases 132, an ultrasonic probe 133, a slide type potentiometer (an example of a distance sensor) 134, and a control board (not shown). An example of means). The XY table 130 of the thickness measuring means 10c is provided at the front end of the first drive carriage 13 constituting the carriage 10b, but at the rear end of the third drive carriage 15 constituting the carriage 10b. It can also be provided.
As shown in FIGS. 1A, 1B, 2, 3 and 16 to 18, the XY table 130 is provided in a direction orthogonal to the axis of the pipe 10a. An attachment member 135 attached and fixed to the front end of the carriage main body 22 of one drive carriage 13; a Y-direction moving member 136 that moves in the vertical direction (of the carriage 10b) with respect to the attachment member 135; An X-direction moving member 137 that moves in the left-right direction (of the carriage 10b) with respect to the member 136 is provided.

The attachment member 135 is provided with an attachment plate 138 attached and fixed to the front end of the carriage body 22 on the rear side (base side), and the Y-direction moving member 136 can be moved in the Y direction on the front side (front side). A slide guide 139 having a concave cross section is provided.
The mounting plate 138 includes a Y-direction driving motor (for example, a DC motor) 140 and a Y that includes an output of the Y-direction driving motor 140 to the Y-direction moving member 136. A direction driving mechanism 142 is provided. The transmission unit 141 includes a rack mechanism (not shown) that connects the mounting member 135 and the Y-direction moving member 136, and bevel gears 143 and 144 that transmit the output of the Y-direction driving motor 140 to the rack mechanism, a worm gear 145, And a worm wheel 146. Note that the configuration of the Y-direction drive mechanism is not limited to this.

The Y-direction moving member 136 is provided with a slide portion 147 movably attached to the slide guide 139 of the attachment member 135 on the rear side, and has a concave cross-section for attaching the X-direction movement member 137 movably in the X direction on the front side. A slide guide 148 is provided.
The slide guide 148 includes an X-direction drive motor (for example, a DC motor) 149 and an X including a transmission unit (reduction gear) 150 that transmits the output of the X-direction drive motor 149 to the X-direction moving member 137. A direction driving mechanism 151 is provided. The transmission unit 150 includes a rack mechanism (not shown) that connects the Y-direction moving member 136 and the X-direction moving member 137, spur gears 152 and 153 that transmit the output of the X-direction driving motor 149 to the rack mechanism, and a worm gear. 154 and a worm wheel 155. Note that the configuration of the X-direction drive mechanism is not limited to this.

The X-direction moving member 137 is provided with a slide portion 156 movably attached to the slide guide 148 of the Y-direction moving member 136 on the rear side, and a moving base 157 is attached and fixed to the front side of the slide portion 156. .
With the above configuration, the Y-direction driving motor 140 is driven to move the Y-direction moving member 136, and the X-direction driving motor 149 is driven to move the X-direction moving member 137, thereby moving the moving base 157. The mounting member 135 can be adjusted and moved in one or both of the X direction and the Y direction.
On the front side of the moving base 157, a cylindrical rotary table 131 is a bearing (not shown) so that the center of rotation is in a direction perpendicular to the moving direction of the Y direction moving member 136 and the X direction moving member 137. ) Is rotatably mounted via.

Further, the movable base 157 includes a rotation drive mechanism including a rotation drive motor (for example, a DC motor) 158 and a transmission unit (reduction gear) 159 that transmits the output of the rotation drive motor 158 to the rotation table 131. 160 is provided. The transmission unit 159 includes spur gears 161 and 162, a worm gear 163, a worm wheel 164, a spur gear 165, and a large number of gear teeth 166 formed on the outer periphery of the rotary table 131, which transmit the output of the rotation driving motor 158. It is configured. The gear teeth 166 are formed in a widened portion 167 provided on the front side portion of the rotary table 131. Note that the configuration of the rotation drive mechanism is not limited to this.
Therefore, by transmitting the output from the rotation driving motor 158 to the rotary table 131 via the transmission unit 159, the rotary table 131 can be rotated with respect to the movable frame 157.

As shown in FIGS. 1A, 1 B, 2, 3, and 16 to 19, the mounting portion 168 of the rotary table 131 has a plurality of probes on the basis of the rotation center of the rotary table 131. A toucher mount 132 is provided. Here, four probe mounting bases 132 are provided at equal angles radially with the rotation center of the rotary table 131 as the center.
Each probe mounting base 132 is attached and fixed to the rotary table 131 via an expansion / contraction mechanism 169 and a pressing mechanism 170.
As shown in FIGS. 16 and 19, the expansion / contraction mechanism 169 includes two guide rods 171 arranged parallel to each other in the radial direction of the pipe 10 a, and both longitudinal ends of each guide rod 171. There are fixed plate portions 172 and 173 attached and fixed to (the base end portion and the distal end portion), and a movable plate portion 174 provided so as to be movable along the guide rod 171 between the two fixed plate portions 172 and 173. doing.

The fixed plate portion 172 attached and fixed to the base side of the guide rod 171 is fixedly attached to the attachment portion 168 of the rotary table 131.
In addition, a sliding plate member 175 is provided on the fixed plate portion 172 attached and fixed to the base side of the guide rod 171, the fixed plate portion 173 attached and fixed to the front side, and the moving plate portion 174. The sliding screw member 175 has a thread groove formed around the shaft, a sliding screw 176 disposed in parallel with a gap from the two guide rods 171, and a thread groove that engages with the thread groove. The slide screw nut 177 is formed around the periphery. The slide screw nut 177 is attached and fixed to the movable plate portion 174, the slide screw 176 passes through the movable plate portion 174, the tip end portion of the slide screw 176 is fixed to the fixed plate portion 173, and the base end of the slide screw 176. The parts are attached to the fixed plate part 172 in a rotatable manner.
Accordingly, by rotating the slide screw 176, the moving plate portion 174 can move between the two fixed plate portions 172 and 173.

Further, a fixed plate portion 172 attached and fixed to the base side of the guide rod 171 has a moving plate portion driving motor (for example, a DC motor) 178 and an output of the moving plate portion driving motor 178 as a sliding screw 176. A moving plate part drive mechanism 180 having a transmission part (reduction gear) 179 for transmitting to is provided. The transmission unit 179 includes bevel gears 181 and 182 that transmit the output of the moving plate unit driving motor 178, a worm gear 183, and a worm wheel 184 that is fixedly attached to the base end of the slide screw 176. In addition, the structure of a moving plate part drive mechanism is not limited to this.
Thereby, the moving plate portion 174 can be moved along the guide rod 171 by transmitting the output from the moving plate portion driving motor 178 to the slide screw 176 via the transmitting portion 179.

The pressing mechanism 170 has an L-shaped fixed base 185 attached and fixed to the moving plate 174, and two support rods 186 for attaching the probe mounting base 132 to the fixed base 185. Yes. The fixed base 185 has a rear upper portion attached and fixed to the movable plate portion 174 so that the front lower portion protrudes forward.
The two support rods 186 are provided in a state of penetrating the lower part on the front side of the fixed base 185 so that the support rods 186 are parallel to each other with a space therebetween and parallel to each guide rod 171 with a space therebetween. The front portion is rotatably attached to both sides in the width direction of the probe mounting base 132 by screws 187, and the base portion is attached and fixed to a fixed plate 188. The portions of the support rods 186 that protrude from the fixed base 185 toward the probe mounting base 132 are inserted into the compression spring 189 to urge the probe mounting base 132 in the direction away from the fixed base 185. Yes.
As a result, each probe mounting base 132 is moved radially outward of the pipe 10a by the guide rods 171 and the support rods 186 arranged in the radial direction of the pipe 10a (direction orthogonal to the rotation center of the turntable 131). It is provided to be movable in the pressed state.

The fixed base 185 and the fixed plate 188 are connected by a potentiometer 134, and the distance between the fixed base 185 and the fixed plate 188, that is, the distance of the probe mounting base 132 to the fixed base 185 (the distance from the rotation center of the rotary table 131). Can be measured).
The probe mounting base 132 is provided with four wheels 190 that travel along the inside of the pipe 10a, and a conventionally known ultrasonic probe 133 that measures the thickness of the pipe 10a. Yes. Further, each probe mounting base 132 is provided with a water supply port (not shown) for supplying water as a medium between the ultrasonic probe 133 and the inner wall of the pipe 10a. The wheels 190 and the water supply port are preferably provided on each probe mounting base 132 as described above, but may not be provided as necessary.

Movement of the Y-direction drive motor 140 of the Y-direction drive mechanism 142, the X-direction drive motor 149 of the X-direction drive mechanism 151, the rotation drive motor 158 of the rotation drive mechanism 160, and the moving plate portion drive mechanism 180 described above. The driving of the plate portion driving motor 178 and the like is controlled by a control board provided on the carriage 10b (for example, on the carriage main body 22 of each of the first to third driving carriages 13 to 15). The measured value of each potentiometer 134 is also transmitted to the control board.
Thereby, based on the measured value from each potentiometer 134, the Y direction drive motor 140 and the X direction drive motor 149 can be driven by the control board. Therefore, the movable gantry 157 can be adjusted and moved in the X and Y directions by the XY table 130, and the rotation center position of the rotary table 131 provided on the movable gantry 157 can be matched with the axial center position of the pipe 10a.

Here, a method of matching the rotation center position of the turntable 131 with the axial center position of the pipe 10a will be described below. Note that the positioning of the movable plate portion 174 by the expansion / contraction mechanism 169 is not considered here because it is the same for all the movable plate portions 174 (the same position with respect to the rotation center of the rotary table 131).
First, as shown in FIG. 20, the displacement of the distance from the rotation center of the rotary table 131, that is, d _L , d _R , d _A , and Measure _B. Here, by using the relational expression shown in Expression (1), the center of rotation of the turntable 131 with respect to the axial center position (origin) of the pipe 10a from the displacements d _L , d _R , d _A , and d _{B of} the distances described above. displacement _x p position, _{y p} are obtained. The angle θ is an inclination angle of a line connecting the probe mounting bases 132 arranged to face each other with respect to the x axis and the y axis when viewed from the front (when the pipe 10a is viewed in the axial direction).

Therefore, as the above-mentioned displacement _x p, _{y p} is "0", the control board, to move the XY table 130.
Thereby, the rotation center position of the turntable 131 can be made to correspond with the axial center position of the piping 10a.

Then, the usage method of the pipe thickness measuring apparatus 10 which concerns on one embodiment of this invention is demonstrated, referring FIG. 1 (A), (B), FIG. 2, and FIG.
First, the measuring device 10 is assembled in the vicinity of the pipe 10a.
In this assembly, the front sides of the arms 16 and 17 attached to the arm attachment portions 68 and 69 of the first and third drive carriages 13 and 15 shown in FIG. 4 are connected to the second drive carriage 14 shown in FIG. The first to third drive carriages 13 to 15 are arranged in series as shown in FIG. At this time, the 1st-3rd drive trolleys 13-15 are arranged so that each wheel 11 and 12 may face the radial direction outside of piping 10a, respectively.

Here, the thickness measuring means 10c is attached to the front end of the first drive carriage 13 constituting the carriage 10b of the measuring apparatus 10, but the rear end of the third drive carriage 15 constituting the carriage 10b. The thickness measuring means 10c can be attached to the part. Furthermore, the bogie main body 22 of the first to third driving carriages 13 to 15 constituting the carriage 10b includes various measuring means such as a camera (imaging means), an eddy current sensor, and a laser distance meter according to the intended use. (Scanning is possible) One or more of a manipulator (collecting foreign matter), a cleaning means, a polishing means, and a welding means can be attached.
Then, a power supply cable and a control cable (not shown) are connected to the measuring apparatus 10 so that the user can control the information using a computer, for example, and various information from the measuring apparatus 10 (information on the control board). Is ready for input to the computer. In addition, a battery can be attached to any one or two or more of the driving carts constituting the measuring device, and remote operation by radio can be performed.

After the preparation is completed, the measuring device 10 is arranged in the pipe 10a, and the pressing force to the inner surface of the pipe 10a of the first to third drive carriages 13 to 15 is adjusted.
The pressing force of the carriage 10b is adjusted by individually operating the spring adjustment motors 72 and 100 while checking the detection values of the potentiometers 86 and 115 provided in the first to third drive carriages 13 to 15, respectively. . This adjustment of the pressing force is performed so that, for example, force is applied to the torsion springs 67, 95, and 125 to such an extent that the measuring device 10 does not drop when traveling in the vertical pipe 10a.
Thus, the first to third drive carriages 13 to 15 can be stretched in a V shape by the arms 16 and 17 when viewed from the side between the two opposing faces (the lower face 20 and the upper face 21).

Further, after adjusting the pressing force of the carriage 10b, the pressing force to the inner surface of the pipe 10a of each probe mounting base 132 is adjusted.
The pressing force of each probe mounting base 132 drives the Y-direction driving motor 140 and the X-direction driving motor 149 so that the rotation center position of the rotary table 131 is in the vicinity of the axial center position of the pipe 10a. Adjustment is performed after the moving base 157 is adjusted and moved in the X and Y directions by the XY table 130. For example, even if the inner diameter of the pipe 10a is changed, the pressing force is adjusted so that the probe mounting base 132 can be kept in contact with the inner surface of the pipe 10a by the compression spring 189. The position of the part 174 is adjusted. In addition, the position of each moving plate part 174 is set to the same position with the rotation center of the rotary table 131 as a reference.
Thereby, each probe mounting base 132 can maintain the contact state to the piping 10a inner surface.

Thus, after adjusting the pressing force of each probe mounting base 132, the rotational center position of the rotary table 131 is made to coincide with the axial center position of the pipe 10a.
This adjustment, from the relational expression of Formula (1), displacement _x p of the rotation center position of the turntable 131 with respect to a central axial position of the pipe 10a, seek _{y p,} the displacement _x p, _{y p} is "0" This is done by moving the XY table 130 by the control board. This adjustment is preferably performed in advance before measuring the thickness of the pipe 10a, but may be performed at the same time as starting the thickness measurement.
Thereby, the rotation center position of the turntable 131 can be made to correspond with the axial center position of the piping 10a.

And the thickness measurement of the pipe 10a is measured with the ultrasonic probe 133 of the thickness measurement means 10c, carrying out the synchronous driving | operation of the 1st-3rd drive trolleys 13-15 and making the trolley | bogie 10b of the measuring apparatus 10 drive | work. Do.
Here, since the 1st-3rd drive trolley 13-15 which comprises the trolley | bogie 10b can drive | operate independently, respectively, for example, driving | running | working of the 1st-3rd drive trolley 13-15, without making it drive synchronously. The traveling of the measuring device 10 may be controlled by individually controlling (forward or backward), stopping, or speed. In addition, the tensile force in the pipe 10a is controlled by linking the running and stopping of a specific drive carriage, or switching between forward and backward, and the adjustment of the tensile force by the torsion springs 67, 95, and 125. Is possible.

Thereby, even when the measuring apparatus 10 passes through the curved pipe 10a, the measuring apparatus 10 can travel without slipping in the pipe 10a. In this way, when passing through the curved pipe 10a, the tension force may be reduced, but the spring adjustment motors 72 and 100 can be individually controlled. For this reason, the angle control of the arms 16 and 17 with respect to the first to third drive carriages 13 to 15 can be independently performed for each of the first to third drive carriages 13 to 15, and the measuring device 10 is fixedly stretched. It becomes possible to keep power.
In addition, by rotating each wheel 11 and 12 of the 1st-3rd drive trolleys 13-15 which comprise the trolley | bogie 10b of the measuring apparatus 10 with a steering mechanism, for example, rotation of the measuring apparatus 10 on the spot is carried out. Traveling or spiral traveling is possible, and it is possible to travel while avoiding obstacles such as manholes or valves.

Further, when measuring the thickness of the pipe 10a, the carriage 10b is controlled to repeat movement (for example, 1 to 10 mm) and stop in the traveling direction, and when it stops, the rotation driving motor 158 is driven, The rotary table 131 is rotated with respect to the movable frame 157 in the range of 0 (initial position) to 90 degrees. Thereby, the thickness of the perimeter of the piping 10a can be measured.
The thickness measurement of the pipe 10a is not limited to this, and may be performed by rotating the rotary table 131 with respect to the movable base 157 while the carriage 10b is running.
When the thickness of the pipe 10a is measured by the above-described method, the rotation center position of the turntable 131 may deviate from the axial position of the pipe 10a due to a change in the inner diameter of the pipe 10a. Therefore, in such a case, the XY table 130 is driven by the control board based on the measurement values from the four potentiometers 134 so that the rotational center position of the rotary table 131 coincides with the axial center position of the pipe 10a. Then, the thickness of the pipe 10a is measured.

From the above, by using the pipe thickness measuring device 10 of the present invention, the pipe 10a is freely moved within the three-dimensionally stretched pipe 10a and continuously ultrasonically from the inside of the pipe 10a. Thickness can be measured. In addition, the shape and distribution of scratches and thinning can be easily recognized from the measurement data.
The thickness measurement position in the circumferential direction of the pipe 10a is, for example, a gyro sensor (also referred to as an acceleration sensor or a gravity sensor) provided on the carriage 10b (first to third driving carriages 13 to 15), and a rotary table. It can be detected by a rotary encoder (angle detector) provided at 131.
Further, the thickness measurement position (travel distance of the measuring device 10) in the axial direction of the pipe 10a (traveling direction of the pipe thickness measuring device 10) is a carriage 10b (here, a rotary encoder attached to the second driving carriage 14). 53).

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, the case where the pipe thickness measuring device of the present invention is configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
In the above-described embodiment, the case where four probe mounting bases are provided at equal angles with the rotation center of the rotary table as the center has been described. You may provide a stand or 5 or more. In this case, the position of the rotation center of the rotary table is adjusted according to the number of probe mounting bases.

10: Piping thickness measuring device, 10a: Piping, 10b: Cart, 10c: Wall thickness measuring means, 11, 12: Wheel, 13: First driving cart, 14: Second driving cart, 15: Third driving Cart, 17, 17: Arm, 18, 19: Coupling mechanism, 20: Lower surface, 21: Upper surface, 22: Cart body, 23: Tire, 24: Shaft, 25: Fixed base, 26: Bearing, 27: Motor for driving , 28: transmission means, 29: drive mechanism, 30: worm wheel, 31: worm gear, 32, 33: spur gear, 34, 35: bevel gear, 36: rotating upper part, 37: rotating lower part, 38: worm wheel , 39: stopper, 40: upper plate portion, 41: lower plate portion, 42, 43: through hole, 44: guide hole, 45: coupling, 46: worm gear, 47: steering motor, 48: potentiometer (Front / rear direction detector), 50: fixed base, 51, 52: pulley, 53: rotary encoder, 54: pulley belt, 55: potentiometer (left / right direction detector), 60, 61: connecting means, 62: mounting base 63: Rotating shaft (connecting portion), 64: Bearing, 65: Spur gear, 66: Bearing, 67: Torsion spring (spring material), 68, 69: Arm mounting portion, 70, 71: Fixed portion, 72: Spring Adjustment motor, 73: transmission means, 74, 75: spur gear, 76: worm gear, 77: worm wheel, 78: rotating shaft, 79, 80: spur gear, 81: bearing, 82: rotating shaft, 83-85: Spur gear, 86: Potentiometer (angle detector), 90: Mounting base, 91: Rotating shaft (connecting part), 93: Spur gear, 94: Bearing, 95: Torsion spring (spring material) 96, 97: Arm attachment portion, 98, 99: Fixed portion, 100: Spring adjusting motor, 101: Transmission means, 102, 103: Spur gear, 104: Worm gear, 105: Worm wheel, 106: Rotating shaft, 107, 108: Spur gear, 109: Bearing, 110: Rotating shaft, 111, 112: Spur gear, 113, 114: Pulley, 115: Potentiometer (angle detector), 116: Pulley belt, 120: Connecting means, 121: Rotating shaft (Connecting portion), 122: bearing, 123: spur gear, 124: bearing, 125: torsion spring (spring material), 126, 127: arm mounting portion, 128, 129: fixed portion, 130: XY table, 131: rotation Table, 132: Probe mounting base, 133: Ultrasonic probe, 134: Potentiometer (distance sensor), 135: mounting member, 136: Y direction moving member, 137: X direction moving member, 138: mounting plate, 139: slide guide, 140: Y direction driving motor, 141: transmission portion, 142: Y direction driving mechanism, 143 144: Bevel gear, 145: Worm gear, 146: Worm wheel, 147: Slide part, 148: Slide guide, 149: Motor for X direction drive, 150: Transmission part, 151: X direction drive mechanism, 152, 153: Flat Gears, 154: worm gear, 155: worm wheel, 156: slide part, 157: moving base, 158: motor for rotation drive, 159: transmission part, 160: rotation drive mechanism, 161, 162: spur gear, 163: worm gear, 164: Worm wheel, 165: Spur gear, 166: Gear teeth, 167: Widening part, 168: Attaching part, 169: Expansion / contraction mechanism, 170: Pressing mechanism, 171: Guide rod, 172, 173: Fixed plate part, 174: Moving plate part, 175: Sliding screw member, 176: Sliding screw, 177: Sliding screw nut, 178: Motor for driving moving plate portion, 179: Transmission portion, 180: Moving plate portion driving mechanism, 181, 182: Bevel gear, 183: Worm gear, 184: Worm wheel, 185: Fixing base, 186: Support rod, 187: Screw, 188: Fixed plate, 189: Compression spring, 190: Wheel

Claims (6)

A dolly that travels in the pipe that is the inspection object;
An XY table provided at a front end portion or a rear end portion of the carriage and provided in a direction orthogonal to the axis of the pipe;
A rotary table provided on a moving base that is adjusted and moved in the X and Y directions by the XY table;
A plurality of probe mounts provided so as to be movable in a pressed state radially outward with respect to the rotation center of the rotary table;
An ultrasonic probe mounted on each of the probe mounting bases and measuring the thickness of the pipe;
A distance sensor for measuring a distance from the rotation center of each probe mounting base;
A pipe thickness measuring apparatus comprising: a control unit configured to drive the XY table based on a measurement value from each distance sensor so that a rotation center of the rotary table coincides with an axis of the pipe. 2. The pipe thickness measuring apparatus according to claim 1, wherein four probe mounting bases are provided at an equal angle with the rotation center of the rotary table as the center. The pipe thickness measuring device according to claim 1 or 2, wherein each probe mounting base is provided with a wheel that causes the probe mounting base to travel along the inside of the pipe. Pipe thickness measuring device. 4. The pipe thickness measuring apparatus according to claim 3, wherein each probe mounting base is provided with a water supply port for supplying water as a medium between the ultrasonic probe and an inner wall of the pipe. A pipe thickness measuring device characterized by that. The pipe thickness measuring apparatus according to any one of claims 1 to 4, wherein the carriage includes three or more drive carriages arranged in series each having a front and rear wheels, and an arm that connects the adjacent drive carriages. And each driving carriage travels between the two surfaces while being stretched in a V shape by the arm according to the distance between the two opposing surfaces of the pipe. Pipe thickness measuring device. 6. The pipe thickness measuring device according to claim 5, wherein a steering mechanism is provided on the front and rear wheels of each drive carriage to change the traveling direction of each drive carriage.

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