JP2006234761A - Ultrasonic measurement device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic measurement device capable of measuring with an ultrasonic probe even for a small pipe diameter without correction of center distance for every pipe diameter. <P>SOLUTION: The ultrasonic measurement device for measuring the damaged state by moving the plurality of ultrasonic probes 11-22 along the circumferential direction of the tube 23 comprises: the master truck 43 provided with the truck frame 26 with a central space K; the front and rear rotation shafts 29 and 30 provided with the respective rotation adjusting mechanisms 27 and 28 provided at the rear and back of the truck frame 26; the front rotation frame 35 provided with the left and right symmetric front wheels 33 and 34; the rear turning frame 40 provided with the left and right symmetric rear wheels 38 and 39 at the tips of the same and the base fixed to the both side of the rear turning shaft 30; and the permanent magnets 41 and 42 provided with a gap G between the bottom of the front turning frame 35 and the rear turning frame 40 and the pipe 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an ultrasonic measurement device that measures damage or the like of a pipe by moving a plurality of ultrasonic probes arranged in a staggered or staircase pattern along the circumferential direction of the pipe, for example.

2. Description of the Related Art Conventionally, as an ultrasonic measurement apparatus that measures the plate thickness of a large-diameter tube, for example, an apparatus described in Patent Document 1 is known. The apparatus described in Patent Document 1 is arranged in a staggered manner in two rows and staggered in the traveling direction of the main carriage, and a main carriage having four traveling wheels capable of traveling on the inner surface of the large-diameter pipe, and moving up and down on the main carriage. It is provided with four or more child carts each provided with four copying wheels facing each other in the same direction as the main cart. The child carriage is provided with an ultrasonic probe with a small gap between the inner surface of the large-diameter tube. In addition, the main carriage is provided with a distance meter for measuring the travel distance of the main carriage. From the output of the distance meter and the output of the ultrasonic probe, a predetermined width with respect to the measurement position in the inner circumferential direction of the large-diameter tube is provided. It is configured to output the wall thickness distribution. In addition, although the main trolley | bogie and the sub trolley | bogie scan the inner periphery of a large diameter tube, the outer periphery and flat plate of a large diameter tube can also be scanned.
In the apparatus of this type, as shown in FIGS. 12 (A) and 12 (B), the copying of the child carriages 172 and 173 with respect to the surface irregularities when the measurement object is the flat plate 170 and the pipe 171 It is carried out by a vertical scanning mechanism 174 provided on each of a cart (not shown) and slave carts 172, 173 arranged in two rows in the traveling direction, and a rotational scanning mechanism 175 provided on each of the slave carts 172, 173. ing. The rotational center height H of the rotational copying mechanism 175 is, for example, about 20 mm from the surface of the measurement object.

JP 2004-144710 A (FIGS. 1 to 4)

However, the conventional ultrasonic measuring apparatus still has the following problems to be solved.
When the tube diameter is large in scanning the tube (for example, 2000 mm or more), the child carriage can be swung up and down and swung back and forth in response to the change in the tube diameter, but the tube diameter is small ( For example, in the case of 300 to 1500 mm), since the four traveling wheels of the parent carriage are fixed to the carriage body, the copying wheels of the child carriage cannot follow the pipe. There was a problem that it could not be measured by the tentacles.
Furthermore, when using a conventional ultrasonic measurement device, as shown in FIG. 12, the distance L between the rotation centers, which is the mounting interval of the rotation copying mechanism 175 of the child carriages 172 and 173, is constant (for example, 50 mm). When the device is attached to the tube 171, the probe follows the tube 171 via the copying wheel, and therefore, the probe center distance T on the outer surface of the tube is the probe center distance in the case of the flat plate 170 ( = L), and as a result, it is necessary to correct the distance between the centers of the probes for each tube diameter.

The present invention has been made in view of such circumstances, and an ultrasonic measurement apparatus that can measure with an ultrasonic probe even with a small tube diameter and does not need to correct the center-to-center distance of the probe for each tube diameter. The purpose is to provide.

The ultrasonic measurement apparatus according to the present invention that meets the above-mentioned object moves a plurality of ultrasonic probes arranged in a staggered pattern or a staircase pattern along the circumferential direction of the object to be measured. A multi-channel ultrasonic flaw detector that simultaneously activates the probe, and a calculation unit that outputs a damage status for each position of the measurement object on the basis of the output of the ultrasonic probe and the output from the distance meter An ultrasonic measurement apparatus for measuring a damage state of the measurement object, comprising: (1) a carriage frame having a space in the center; and a rotation adjustment mechanism provided before and after the carriage frame. Front and rear pivot shafts, a front pivot frame having bases attached to both sides of the front pivot shaft, and a pair of front wheels on the left and right sides, and the rear pivot shaft. The base is attached to both sides of the shaft and the tip is left A rear rotating frame provided with a pair of rear wheels, and a permanent magnet provided with a certain gap from the measurement object at the bottom of the front rotating frame and the rear rotating frame; (2) a plurality of sub-carts attached to a plurality of support members across the space of the cart frame in the width direction via universal joint mechanisms, and (3) each of the sub-carts The ultrasonic probe mounted and disposed with a slight gap from the measurement object; and (4) the gap formed between the ultrasonic probe and the measurement object. Water supply means for supplying medium water, and (5) the distance meter attached to the base carriage for measuring the travel distance of the base carriage.

In the ultrasonic measurement device according to the present invention, the plurality of support members are attached to side wall members provided on both sides of the space portion of the carriage frame via screws that penetrate the long holes, and the long holes are Even if the mounting position of the support member is changed according to the diameter of the measurement object, the measurement positions of the adjacent ultrasonic probes that are mounted via the support member and the child carriage are within a certain range. It may be formed.

In the ultrasonic measurement apparatus according to the present invention, the rotation adjustment mechanism includes a worm wheel provided on the front rotation shaft and the rear rotation shaft, and a worm shaft that meshes with the worm wheel and is driven to rotate. You may have.
In the ultrasonic measurement apparatus according to the present invention, the tires of the front wheel and the rear wheel may be made of a soft material.

5. The ultrasonic measuring apparatus according to claim 1, wherein the main carriage is provided in front of and behind a carriage frame having a space portion in the center, and the front and rear turning shafts each provided with a turning adjustment mechanism, and the front turning. The base is attached to both sides of the shaft, the front part is attached to the front part of the front turning frame provided with the front wheels that are paired left and right, and the base part is attached to both sides of the rear part of the turning part. Since it has a rear rotating frame provided with a rear wheel, and a permanent magnet provided with a certain clearance from the measurement object at the bottom of the front rotating frame and the rear rotating frame Even when the tube diameter of the object is small, the main carriage can move along the circumferential direction of the object to be measured. As a result, a plurality of ultrasonic probes arranged in a staggered or stepwise manner and A distance meter provided on the main carriage is placed along the circumferential direction of the measurement object. The moved, it is possible to measure the damage status of the measurement object.

In particular, in the ultrasonic measurement apparatus according to claim 2, the plurality of support members are attached to the side wall members provided on both sides of the space portion of the carriage frame via screws that penetrate the long holes, and the long holes are Even if the mounting position of the support member is changed according to the diameter of the measurement object, the measurement positions of the adjacent ultrasonic probes mounted via the support member and the child carriage are in a certain range. Therefore, it is not necessary to correct the distance between the centers of the ultrasonic probes for each tube diameter, so that the measurement workability is improved.

In the ultrasonic measuring apparatus according to claim 3, since the worm wheel is provided on the front side rotation shaft and the rear side rotation shaft, and the worm shaft meshing with the worm wheel is driven to rotate, the front frame rotates to the carriage frame. No separate means for fixing the frame and the rear rotating frame is required.

In the ultrasonic measurement apparatus according to claim 4, since the tires of the front wheel and the rear wheel are made of a soft material, damage to the outer surface of the measurement object can be reduced, and the front wheel and the rear side can be reduced. It is possible to prevent rust, iron powder and the like from being caught in the wheel, and thus the traveling performance is improved.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a front view of an ultrasonic measurement apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the ultrasonic measurement apparatus, and FIG. 3 is provided with an upper carriage frame of the ultrasonic measurement apparatus. FIG. 4 is a plan view of the main carriage provided with the upper carriage frame of the ultrasonic measurement apparatus, FIG. 5 is a front view of the lower carriage frame and the child carriage of the ultrasonic measurement apparatus, and FIG. FIG. 7A and FIG. 7B are a plan view, a front view, and a drawing of a child carriage provided with a universal joint mechanism of the ultrasonic measurement device, respectively. 8 is a side view of a child carriage provided with the universal joint mechanism of the ultrasonic measurement apparatus, and FIGS. 9A, 9B, and 9C are a plane, a curved surface having a large curvature radius, and a curved surface having a small curvature radius, respectively. FIGS. 10A and 10B are explanatory views showing the mounting state of the three rows of child carriages traveling on the road. And explanatory diagram comparing the probe center distance probe in the conventional example, FIG. 11 is an explanatory view of the present invention and the probe center distance in the conventional example were compared with the pipe diameter.

As shown in FIGS. 1 and 2, the ultrasonic measurement apparatus 10 according to an embodiment of the present invention includes a plurality of (12 in this embodiment) arranged in three rows and steps in the front-rear direction. This is an apparatus that moves the ultrasonic probes 11 to 22 along the circumferential direction of a tube 23 that is an example of an object to be measured, and measures the damage state.

As shown in FIGS. 1 to 4, the ultrasonic measurement apparatus 10 includes a carriage frame 26 including an upper carriage frame 24 having a space K at the center and a lower carriage frame 25 screwed to the lower end of the upper carriage frame 24. And front and rear rotation shafts 29, 30 provided on the front and rear sides of the carriage frame 26 and provided with rotation adjustment mechanisms 27, 28, respectively, and base portions 31, 32 are attached to both sides of the front rotation shaft 29, The front side rotating frame 35 provided with the front wheels 33 and 34 that are paired to the left and right is attached to the part, and the bases 36 and 37 are attached to both sides of the rear side turning shaft 30, and the rear part that is the left and right pair is attached to the front part. A rear rotating frame 40 provided with wheels 38 and 39, and a permanent magnet 41 provided with a certain gap G between the tube 23 and the bottom of the front rotating frame 35 and the rear rotating frame 40, Parent with 42 Have a car 43.

As shown in FIGS. 5 to 8, the ultrasonic measurement apparatus 10 further includes a plurality of (three in this embodiment) support members 44 to straddle the space K of the lower carriage frame 25 in the width (left and right) direction. 46, which are mounted on each of the slave carriages 48 to 59 and attached to each of the slave carriages 48 to 59, with a small gap g between the pipe 23 and the pipe 23. The ultrasonic probes 11 to 22 are arranged.

The ultrasonic measurement apparatus 10 includes a water supply unit 61 that supplies medium water 60 to a gap g formed between the ultrasonic probes 11 to 22 and the tube 23, and a front rotating frame of the main carriage 43. 35, a distance meter 62 that measures the travel distance of the main carriage 43, a multi-channel ultrasonic flaw detector (not shown) that operates the ultrasonic probes 11 to 22 at the same time, and the ultrasonic probe 11 And a control device (not shown) having a calculation unit that outputs a damage status for each position of the tube 23 based on the output of ˜22 and the output from the distance meter 62. Hereinafter, these will be described in detail.

As shown in FIGS. 3 and 4, the upper carriage frame 24 includes a rectangular front plate 63 and a rear plate 64 that are horizontally disposed opposite to each other with a parallel interval in the front-rear direction, and a front plate 63 and a rear plate 64. Are formed in a substantially rectangular frame shape by a substantially rectangular right plate 65 and a left plate 66 which are vertically arranged opposite to each other in the left-right direction with a parallel interval therebetween. The right plate 65 and the left plate 66 are formed with two track-shaped cutout holes 67 and 68 at the front and rear at an intermediate position in the vertical direction, and the inside can be observed through the cutout holes 67 and 68. The upper bogie frame 24 is reduced in weight. Front and rear rotating shafts 29 and 30 pass through lower portions of both ends of the right plate 65 and the left plate 66 in the front-rear direction, and both ends of the front and rear rotating shafts 29 and 30 are located on the right plate 65. The bearings 69 and 70 provided on the left plate 66 are rotatably supported.

Worm wheels 71, 72 are provided at the center in the longitudinal direction of the front rotation shaft 29 and the rear rotation shaft 30, and the worm shafts 73, 74 meshing with the worm wheels 71, 72 are curvature adjusting knobs 75, Rotation drive is performed by 76. Both end portions of the worm shafts 73 and 74 are rotatably supported by bearings 73a and 73b, 74a and 74b attached to the front plate 63 and the rear plate 64, respectively.

The front rotation frame 35 and the rear rotation frame 40 are disposed outside the right plate 65 and the left plate 66 of the upper carriage frame 24 and are fixed to both ends of the front rotation shaft 29 and the rear rotation shaft 30. Arm members 77, 78, a connecting member 79 that connects the distal ends of the arm members 77, 78, and wheel mounting members 80, 81 provided outside the connecting member 79 in the front-rear direction.
In the vicinity of the front wheels 33 and 34 and the rear wheels 38 and 39 at the bottom of the wheel mounting members 80 and 81, a plurality of rectangular plate-like permanent magnets 41 and 42 are mounted via a case (not shown). The front wheels 33 and 34, the rear wheels 38 and 39, and the permanent magnets 41 and 42 have substantially the same center position in the traveling (front-rear) direction, and the front wheels 33 and 34 and the rear wheels 38 and 39 are on the traveling surface. Even if it moves up and down, the permanent magnets 41 and 42 can maintain a slight gap G with the tube 23.

Front wheels 33 and 34 and rear wheels 38 and 39 are attached to the wheel mounting members 80 and 81, and the tires of the front wheels 33 and 34 and the rear wheels 38 and 39 are urethane rubber which is an example of a soft material. It is made up of. The outer diameters of the front wheels 33 and 34 and the rear wheels 38 and 39 are about 70 mm.

As shown in FIGS. 1, 2, 5, and 6, the lower carriage frame 25 is attached to the lower end portion of the upper carriage frame 24 by screw fastening through four mounting brackets 86 provided at the front, rear, and left and right. It has been.
As shown in FIGS. 5 and 6, the lower cart frame 25 has substantially rectangular plate-like side wall members 87, 88 arranged in parallel and spaced apart from each other in the left-right direction, and front and rear sides of the side wall members 87, 88. It has rectangular plate-shaped connecting members 89 and 90 that connect both ends in the direction by screw fastening, and is formed in a rectangular frame shape. The side wall members 87 and 88 are formed with substantially rectangular cutout holes 91a to 91c in the front-rear direction, the inside can be observed through the cutout holes 91a to 91c, and the weight of the lower carriage frame 25 can be reduced. I am trying.

Between the side wall members 87 and 88 of the lower cart frame 25, a rectangular plate-like support member 44 to which the first row of child carts 48 to 51 are attached at a pitch P, and a rectangle to which the second row of child carts 52 to 55 are attached at a pitch P. A plate-like support member 45 and a rectangular plate-like support member 46 to which the third row of child carts 56 to 59 are attached at a pitch P are attached at a parallel interval in the front-rear direction. The second-row child carriages 52 to 55 are arranged to be shifted to the left by (1/3) P with respect to the first-row child carriages 48 to 51, while the third-row child carriages 56 to 59 are arranged with respect to the first-row child carriages 48 to 51. Thus, they are shifted to the right by (1/3) P. The pitch in the front-rear direction between the first-row child trolleys 48 to 51 and the second-row child trolleys 52 to 55, and the second-row child trolleys 52-55 and the third-row child trolleys 56-59 is W. Note that the pitch W between the child carriages is the same as the pitch of the ultrasonic probes mounted on the child carriages in each row.

As shown in FIGS. 5 and 6, the support member 44 can be attached and detached via two screws S on one side passing through the two arc-shaped elongated holes 92 and 93 formed facing the side wall members 87 and 88. The support member 45 is detachably attached via two screws S on one side passing through one straight elongated hole 94 formed opposite to the side wall members 87 and 88, and the support member 46 is The side wall members 87 and 88 are detachably attached via two screws S on one side passing through the two arc-shaped elongated holes 95 and 96 formed facing the side wall members 87 and 88.

As shown in FIGS. 9A, 9B, and 9C, the long holes 92 and 93, the long holes 94, and the long holes 95 and 96, respectively, are the child carriages 48 to 51, 52 to 55, and 56 in each row. The second row sub-carts 52 to 55 move up and down so that .about.59 can follow the outer surface of the flat plate F having the radius of curvature infinity (infinity), the tube 23a having the radius of curvature R, and the tube 23 having the radius of curvature r. However, the first-row child carts 48 to 51 and the third-row child carts 56 to 59 are formed so as to be symmetrically inclined with respect to the second-row child carts 52 to 55. Here, R = 800 mm and r = 300 mm.

That is, the support member 45 is at the lowest position with respect to the long hole 94 on the flat plate F shown in FIG. 9A, and the long hole 94 on the tube 23a having the curvature radius R shown in FIG. 9B. The tube 23 having the radius of curvature r shown in FIG. 9C is configured to be at the uppermost position with respect to the long hole 94.
The support member 44 is at the last position on the flat plate F shown in FIG. 9A with respect to the long holes 92 and 93, and on the tube 23a shown in FIG. At the intermediate position, the tube 23 shown in FIG. 9C is configured to be at the foremost position with respect to the long holes 92 and 93.
The support member 46 is at the forefront position with respect to the long holes 95 and 96 on the flat plate F shown in FIG. 9A, and is on the long holes 95 and 96 on the tube 23a shown in FIG. At the intermediate position, on the tube 23 shown in FIG. 9C, it is configured to be at the last position with respect to the long holes 95 and 96.

In addition, as shown in FIG. 5, the shape of the long holes 92 and 93 is a radius with respect to the center N of the substantial contact part of the ultrasonic probes 11 to 14 of the child carriages 48 to 51 and the flat plate F, respectively. X and Y are formed. Further, the shapes of the long holes 95 and 96 are also formed with radii X and Y with respect to the center M of the substantial contact portion between the ultrasonic probes 19 to 22 and the flat plate F of the child carriages 56 to 59, respectively. Yes.
With this configuration, even if the attachment positions of the support members 44 to 46 are changed according to the diameter (curvature radius) of the tube, the adjacent ultrasonic probes attached via the support members 44 to 46 and the slave carriages 48 to 59 are used. The measurement positions 11 to 22 are in a certain range (that is, the distance Q between the probe centers is constant) (see FIGS. 10A and 11).

As shown in FIGS. 7A, 7 </ b> B, and 8, each of the slave carts 48 (49 to 59 is the same) provided with the ultrasonic probe 11 (12 to 22 is also the same) is a universal joint mechanism. 47, which are attached to the support member 44 (45, 46), so that the four copying wheels 97a provided at the lower part of the child carriage 48 irrespective of the vertical movement and the horizontal movement based on the unevenness of the running surface. ˜97d can always travel in contact with the outer surface of the pipe 23. Therefore, the ultrasonic probe 11 provided in the child carriage 48 can always maintain a constant gap g between the ultrasonic probe 11 and the outer surface of the tube 23 when the parent carriage 43 moves. The outer diameter of the copying wheels 97a to 97d is about 12 mm.

As shown in FIGS. 7A, 7B, and 8, a rectangular plate-like holder base 98 is screwed up and down in the vertical direction on the rear surface of the support member 44 in front of the child carriage 48. Two hooking protrusions 99 and 100 formed at an upper end portion of 98 with a space in the vertical direction are hooked into a hooking recess formed on the rear surface of the support member 44.
On the rear side of the lower portion of the holder base 98, guide members 101 and 102 having concave portions with a parallel interval in the left-right direction are provided. A slide ball 103 that slides in the recesses of the guide members 101 and 102 is provided at the front end of the lower end portion, and an intermediate portion in the vertical direction of the slide member 104 that moves in the vertical direction and the vicinity of the engaging projection 100 of the holder base 98 A coil spring 107 is provided between the spring stopper 106 provided on the rear surface 105. The slide member 104 is always biased downward via the coil spring 107.

As shown in FIGS. 7A, 7B and 8, the lower end of the slide member 104 is rotatably supported by two bearings (not shown) arranged in series in the front-rear direction. A bolt-shaped rotating shaft 108 is provided, and a U-shaped (bifurcated) arm 109 having an opening in the rear in plan view is fixed to the rear end portion of the rotating shaft 108. A bearing metal (not shown) is attached to both rear ends of the arm 109, and a screw having an opening on the rear side in plan view via mounting bolts 110 and 111 that slide on the inner peripheral surface of the bearing metal. A character-shaped child carriage 48 is provided. Copy wheels 97a to 97d are rotatably provided through bearings at the front and rear, and at the four corners in the left-right direction of the lower end of the child carriage 48.

With such a configuration, the child carriage 48 can be rotated together with the mounting bolts 110 and 111 around the bearing metal in the range of an angle α (about 10 °) with respect to the arm 109, while the arm 109 is a rotation shaft with respect to the slide member 104. The slide member 104 to which the rotary shaft 108 is attached can slide in the vertical direction with respect to the guide members 101 and 102. ing. That is, the child carriage 48 can be moved up and down with respect to the support member 44 via the universal joint mechanism 47 and can swing in the front-rear and left-right directions.

As shown in FIGS. 7A, 7B, and 8, a probe holding block 113 for fixing the ultrasonic probe 11 is screwed to the upper side of the rear end portion of the child carriage 48. The hose nipple 114 for supplying the medium water 60 to the lower part of the ultrasonic probe 11 is screwed into the upper part of the probe holding block 113 and further communicates with the lower end of the hose nipple 114. A vertical flow path is formed up to the probe pressing block 113 and the lower end surface 115 of the child carriage 48.

A rectangular frame-shaped water stopper 116 is provided on the lower end surface 115 of the slave carriage 48 by screw fastening. With such a configuration, the medium probe 60 supplied via the hose nipple 114 is supplied to the ultrasonic probe 11. The gap g between the lower surface of the tube and the outer surface of the tube 23 can be filled. Thereby, the ultrasonic wave oscillated from the ultrasonic probe 11 is reliably propagated to the outer surface of the tube 23, and the reflected waves from the outer surface and the inner surface of the tube 23 are also reliably propagated to the ultrasonic probe 11. .

As shown in FIGS. 5 and 6, a substantially rectangular parallelepiped manifold 117 is screwed at the upper ends of the side wall members 87 and 88 of the lower carriage frame 25 and between the ultrasonic probes 15 to 18 and 19 to 22. It is provided by fastening. One large hose nipple 118 on the supply side is attached to the upper surface of the right end portion of the manifold 117, and a flow path communicating with the hose nipple 118 and 12 branches branched from the flow path are provided in the manifold 117. A branch channel is formed, and the downstream ends of the twelve branch channels are respectively communicated with twelve small hose nipples 119 on the discharge side provided on the upper surface of the manifold 117. By connecting each hose nipple 119 and the hose nipple 114 provided in each of the child carriages 48 to 59 by a vinyl hose (not shown), the medium water 60 supplied via the hose nipple 118 is supplied to the hose nipple 114. Can be supplied directly below the ultrasonic probes 11-22.

As shown in FIGS. 1 to 4, the distance meter 62 is provided in the vicinity of the front wheel 33 of the front rotation frame 35, and is an ultrasonic probe 11 to 22 attached to the child carriages 48 to 59. It is provided in another position.
The distance meter 62, like the front wheels 33 and 34 and the rear wheels 38 and 39 of the main carriage 43, always rolls in contact with the outer surface of the pipe 23 during traveling, and is a length measurement made of a soft material made of nylon. A roller 120 is provided. The distance meter 62 is a rotating arm 121 that rotates around a fixed shaft provided at the tip of a mounting bracket (not shown) fixed to the wheel mounting member 80 of the front rotating frame 35 via a mounting bolt. And a rotary encoder 122 attached to the tip of the rotating arm 121, and the output shaft of the rotary encoder 122 is attached to the rotating shaft 123 of the length measuring roller 120 via a magnet coupling. .

Although not shown, between the upper part of the mounting bracket and the base end of the rotating arm 121, the length measuring roller 120 always rolls while contacting the outer surface of the pipe 23 when the main carriage 43 is traveling. Further, a coil spring is provided to urge the rotating arm 121 counterclockwise of the fixed shaft. With this configuration, when the main carriage 43 is traveling, the length measuring roller 120 is always pressed against the outer surface and rolls by the biasing force of the coil spring regardless of the outer surface fluctuation of the tube 23, thereby rotating the length measuring roller 120. Can be transmitted to the rotary encoder 122 via the rotary shaft 123. The travel position is measured by the rotary encoder 122, and the distance between the 12 ultrasonic probes 11 to 22 and the length measuring roller 120 arranged stepwise in the forward direction is taken into account and the measurement position and measurement. Corresponds to the plate thickness.

As shown in FIGS. 2 and 4, at the front end of the wheel mounting member 80 of the front rotating frame 35, signal lines of the 12 ultrasonic probes 11 to 22, to the multichannel ultrasonic flaw detector A cable 124 in which signal lines and power lines to be connected, signal lines of the rotary encoder 122, and the like are bundled is fixed via a cable connector 125.

The hose nipple 118 provided in the manifold 117 shown in FIG. 6 is connected with a vinyl hose for supplying medium water 60 stored in a water tank (not shown) by a pump. The cable 124 and the vinyl hose are bundled except for both ends. The water supply means 61 includes a water tank, a pump, a vinyl hose, a pipe in the main carriage 43 after the manifold 117, and the like.

With reference to FIG. 10 (A), (B) and FIG. 11, the relationship between the probe center distance and a pipe diameter (300-1600 mm) in this invention and a prior art example is demonstrated. In FIGS. 10A and 10B, the symbol L indicates the distance between the rotation centers (probe mounting interval) when traveling on the flat plate F, and the symbol H indicates the rotation center of the outer surface of the tube 23 and the child carriage. The symbol Q represents the distance between the probe centers on the outer surface of the tube of the present invention, and the symbol T represents the distance between the probe centers on the outer surface of the tube of the conventional example. Here, L = 50 mm and H = 20 mm.

In the present invention shown in FIG. 10A, the rotation center O of the front child carriage 48 is a substantially contact portion between the ultrasonic probe 11 and the tube 23 in accordance with the radius of curvature (tube diameter) of the tube 23. Therefore, the distance Q between the probe centers on the outer surface of the tube is almost the same as the distance L between the rotation centers. On the other hand, in the conventional example shown in FIG. 10B, the horizontal distance between the rotation centers O of the front and rear child carriages 172 and 173 is fixed at the distance L between the rotation centers regardless of the radius of curvature of the tube 23. The distance T between the probe centers on the outer surface of the tube is shorter than the distance L between the rotation centers.
Accordingly, as shown in FIG. 11, the probe center distance Q in the present invention and the probe center distance T in the conventional example vary depending on the tube diameter, but in the present invention, Q and L are substantially equal. In the conventional example, T <L, and in particular, (LT) increases as the tube diameter decreases. For this reason, in the case of the conventional example, it is necessary to correct the distance between the centers of the probes. However, in the present invention, correction is not necessary.

Next, a method for measuring the thickness of the tube 23 using the ultrasonic measurement apparatus 10 according to an embodiment of the present invention will be described with reference to the drawings.
In advance, in the master carriage 43 and the slave carriages 48 to 59, water piping for supplying the medium water 60, wiring between the cable 124, the ultrasonic probes 11 to 22, the rotary encoder 122, and the like are performed. In addition, a personal computer, a multi-channel ultrasonic flaw detector, a pump, etc. are installed in a predetermined place, and a cable 124 and a vinyl hose between the main cart 43 and the sub-carts 48 to 59 and the multi-channel ultrasonic flaw detector and pump. Necessary wiring and adjustment work before measurement, such as wiring, piping, wiring between personal computers and multi-channel ultrasonic flaw detectors.

As shown in FIG. 9C, the support members 44 to 46 to which the four ultrasonic probes 11 to 14, 15 to 18, and 19 to 22 are attached according to the curvature radius r of the tube 23 to be measured. Are positioned on the lower carriage frame 25 through the long holes 92 and 93, the long holes 94, and the long holes 95 and 96, and fixed with screws S.
The worm shafts 73 and 74 are rotated by the curvature adjusting knobs 75 and 76, and the front rotating frame 35 and the rear rotating frame 40 are rotated in accordance with the curvature radius r of the tube 23 to be measured. For example, the parent carriage 43 and the child carriages 48 to 59 are arranged so as to be in the circumferential direction with reference to the highest position of the pipe 23 in the circumferential direction.

By attracting the main carriage 43 to the outer surface of the pipe 23 by the permanent magnets 41 and 42, the water supply means 61 is operated to supply the medium water 60 to the water stopper 116 provided at the lower part of the child carriages 48 to 59. The medium water 60 is always filled in the gap g between each of the ultrasonic probes 11 to 22 and the outer surface of the tube 23.
The main carriage 43 is caused to travel in the circumferential direction on the outer surface of the pipe 23 (measurement speed is about 2 m / min).

While the main carriage 43 is traveling, the plate thickness and measurement of the measurement position of the pipe 23 are measured by the ultrasonic probes 11 to 22 attached to the child carriages 48 to 59 and the rotary encoder 122 attached to the parent carriage 43, respectively. The travel position of the main carriage 43 corresponding to the position is measured substantially continuously for one round in the circumferential direction with a measurement width J (= 150 mm) (see FIG. 6). At this time, since the gap water between the ultrasonic probes 11 to 22 and the outer surface of the tube 23 is always filled with the medium water 60, the ultrasonic waves from the ultrasonic probes 11 to 22 are surely received. While propagating to the inner surface, the reflected wave from the outer surface of the tube 23 is also reliably propagated to each of the ultrasonic probes 11 to 22, thereby enabling accurate measurement.

The plate thickness measured by the multi-channel ultrasonic flaw detector based on the outputs of the ultrasonic probes 11 to 22 and the travel position measured by the rotary encoder 122 of the distance meter 62 are calculated by computer processing means (control device). The data is processed by the calculation unit), and the calculation result (damage status at each measurement position of the tube 23) is simultaneously displayed on, for example, a personal computer display.
When the main carriage 43 is rotated once in the circumferential direction of the pipe 23, the travel of the main carriage 43 is stopped, and the main carriage 43 is provided on the downstream side with a measurement width J of, for example, a lap allowance R = 30 mm. , Reposition at the reference position in the circumferential direction. Accordingly, the effective measurement width U (= measurement width J−lap margin R) is 120 mm (see FIG. 6). Thereafter, the above is repeated, and measurement is performed for a predetermined length in the tube axis direction of the tube 23.

The present invention is not limited to the above-described embodiments, and can be changed without departing from the gist of the present invention. For example, some or all of the above-described embodiments and modifications are included. The case where the ultrasonic measurement device of the present invention is configured in combination is also included in the scope of the right of the present invention.
In the embodiment, even if the mounting positions of the support members 44 to 46 are changed according to the tube diameter (curvature radius) of the tube 23, the measurement positions (probe centers) of the adjacent ultrasonic probes 11 to 22 are changed. Although the distance Q) is in a certain range, the present invention is not limited to this, and the mounting position of the support member can be fixed as in the prior art as needed.

Rotation adjusting mechanisms 27 and 28 are provided by worm wheels 71 and 72 provided on the front rotation shaft 29 and the rear rotation shaft 30 and worm shafts 73 and 74 engaged with the worm wheels 71 and 72 and driven to rotate. Although it comprised, it is not limited to this, A front side rotation axis | shaft and a back side rotation axis | shaft can also be driven with another rotation adjustment mechanism as needed.
The tires of the front wheels 33 and 34 and the rear wheels 38 and 39 are made of a soft material made of urethane rubber. However, the present invention is not limited to this, and other soft materials can be used if necessary. A hard material such as metal can also be used.

The main carriage can be moved manually, and if necessary, the front wheels 33 and 34 and the rear wheels 38 and 39 can be independently driven by a reduction motor, and driving means of other structures can be used. Can also be provided.
Although the cart frame 26 is composed of the upper cart frame 24 and the lower cart frame 25, the present invention is not limited to this, and the upper cart frame and the lower cart frame can be integrally configured as necessary.

Although the ultrasonic probes 11 to 22 are arranged in four rows in one row and in three rows in a staircase shape, the invention is not limited to this, and as required, two, three or three ultrasonic probes are arranged in one row. It can be arranged in 5 rows or more, 2 rows (staggered shape), or 4 rows or more (step shape).
Although the rotary encoder 122 is attached to the front turning frame 35, the present invention is not limited to this, and can be attached to the rear turning frame as necessary.
Although the master carriage 43 has been described as moving in the forward direction, the present invention is not limited to this, and can be moved in the backward direction as necessary.

1 is a front view of an ultrasonic measurement apparatus according to an embodiment of the present invention. It is a top view of the same ultrasonic measuring device. It is a front view of the main trolley | bogie provided with the upper trolley | bogie frame of the same ultrasonic measuring device. It is a top view of the main trolley | bogie provided with the top trolley | bogie frame of the same ultrasonic measuring device. It is a front view of a lower trolley frame and a child trolley of the same ultrasonic measuring device. It is a top view of a lower trolley frame and a child trolley of the same ultrasonic measuring device. (A) and (B) are respectively a plan view and a front view of a child carriage provided with a universal joint mechanism of the same ultrasonic measurement apparatus. It is a side view of the sub trolley | bogie provided with the universal joint mechanism of the same ultrasonic measuring device. (A), (B), (C) is explanatory drawing which shows the attachment state of the 3 rows | row child trolley | bogie which drive | works a plane, a curved surface with a large curvature radius, and a curved surface with a small curvature radius, respectively. (A), (B) is explanatory drawing which compared the distance between probe centers in this invention and a prior art example. It is explanatory drawing which compared the distance between probe centers in this invention and a prior art example by the pipe diameter. (A), (B) is explanatory drawing which shows the distance between probe centers of the ultrasonic measuring apparatus which concerns on a prior art example.

Explanation of symbols

10: Ultrasonic measuring device, 11-22: Ultrasonic probe, 23, 23a: Tube, 24: Upper bogie frame, 25: Lower bogie frame, 26: Bogie frame, 27, 28: Rotation adjustment mechanism, 29 : Front rotation shaft, 30: Rear rotation shaft, 31, 32: Base, 33, 34: Front wheel, 35: Front rotation frame, 36, 37: Base, 38, 39: Rear wheel, 40: Back side rotation frame, 41, 42: permanent magnet, 43: master carriage, 44 to 46: support member, 47: universal joint mechanism, 48 to 59: slave carriage, 60: medium water, 61: water supply means, 62 : Distance meter, 63: Front plate, 64: Rear plate, 65: Right plate, 66: Left plate, 67, 68: Notch hole, 69, 70: Bearing, 71, 72: Worm wheel, 73: Worm shaft, 73a, 73b: bearing, 74: worm shaft, 7 a, 74b: Bearing, 75, 76: Curvature adjustment knob, 77, 78: Arm member, 79: Connecting member, 80, 81: Wheel mounting member, 86: Mounting bracket, 87, 88: Side wall member, 89, 90: Connecting member, 91a to 91c: Notch hole, 92, 93: Long hole, 94: Long hole, 95, 96: Long hole, 97a to 97d: Copy wheel, 98: Holder base, 99, 100: Engaging protrusion, 101 , 102: guide member, 103: slide ball, 104: slide member, 105: rear surface, 106: spring stopper, 107: coil spring, 108: rotating shaft, 109: arm, 110, 111: mounting bolt, 113: probe Child presser block, 114: Hose nipple, 115: Lower end surface, 116: Water stopper, 117: Manifold, 118: Hose nipple, 119: E Sunippuru, 120: measurement roller 121: rotary arm, 122: rotary encoder 123: rotary shaft, 124: Cable, 125: cable connector

Claims (4)

A multi-channel ultrasonic flaw detector that moves a plurality of ultrasonic probes arranged in a staggered or stepwise manner along the circumferential direction of the measurement object, and simultaneously operates the ultrasonic probes, And a control device having a calculation unit that outputs a damage state for each position of the measurement object on the basis of the output of the ultrasonic probe and the output from the distance meter, the damage state of the measurement object An ultrasonic measuring device for measuring,
(1) A carriage frame having a space in the center, front and rear turning shafts provided on the front and rear sides of the carriage frame, each having a turning adjustment mechanism, and bases attached to both sides of the front turning shaft. The front part is provided with a front turning frame provided with a pair of left and right front wheels, and a base part is attached to both sides of the rear turning shaft, and the front part is provided with a pair of left and right rear wheels. A main carriage having a rear rotation frame, and a permanent magnet provided at a bottom of the front rotation frame and the rear rotation frame with a certain gap from the measurement object;
(2) a plurality of child carriages each attached to a plurality of support members straddling the space portion of the carriage frame in the width direction via universal joint mechanisms;
(3) the ultrasonic probe mounted on each of the child carriages and disposed with a slight gap from the measurement object;
(4) water supply means for supplying medium water to the gap formed between the ultrasonic probe and the measurement object;
(5) An ultrasonic measurement apparatus comprising: the distance meter attached to the parent carriage for measuring a travel distance of the parent carriage. The ultrasonic measurement apparatus according to claim 1, wherein the plurality of support members are attached to side wall members provided on both sides of the space portion of the carriage frame via screws that penetrate the long holes, and the long holes are Even if the mounting position of the support member is changed according to the diameter of the measurement object, the measurement positions of the adjacent ultrasonic probes mounted via the support member and the slave carriage are within a certain range. An ultrasonic measurement device characterized in that the ultrasonic measurement device is formed. 3. The ultrasonic measurement apparatus according to claim 1, wherein the rotation adjustment mechanism is engaged with a worm wheel provided on the front rotation shaft and a rear rotation shaft, and the worm wheel. And a worm shaft that is rotationally driven. The ultrasonic measurement apparatus according to claim 1, wherein tires of the front wheel and the rear wheel are made of a soft material.

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