JP2000111335A - Groove form measuring apparatus for piping/method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily measure three-dimensionally a groove form of a piping end surface. SOLUTION: This measuring apparatus is equipped with a two-dimensional displacement sensor 14 for measuring at least one of the axial direction displacement and the radial direction displacement of the end surface of a piping 10, a rotating means for rotating the sensor 14 along the end surface of the piping, an angle detecting means 36 for detecting the rotation angle of the rotating means, and a fixing jig for fixing the rotating means to the end portion of the piping. The fixing jig retains rotatably the rotating means, and has a guide part member performing positioning wherein the rotating surface of the rotating means intersects perpendicularly the center axis of the piping 10. Thereby measurement of a groove form is possible on the ground, individually about each piping, and the amount of additional work of the groove also can be known, so that edge preparation is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the shape of the end face of a hollow pipe, and more particularly to a pipe for measuring and comparing the three-dimensional shape of a joint at the end face of the pipe when butt welding the pipe at a construction site. The present invention relates to a groove shape measuring device.

[0002]

2. Description of the Related Art FIG. 17 shows a state in which pipes 10 and 10 are joined to each other. When welding pipes 10 and 10 through which gas or fluid flows at a construction site such as a power plant or a plant, the pipes 10 and 10 are welded before welding the pipes 10 and 10.
Beveling is performed on the end face of the to ensure welding. In the case of a pipe having a diameter of 200 (mm) or more, which is a target of the present invention, fusing is used for cutting the pipes 10 and 10, and a grinder is often used for forming a groove. The groove shape at the joint of the pipes 10 and 10 is generally the shape shown in FIG. 18, and the dimension tolerance of the groove shape required for welding the pipe joint is that the gap G is ± 0.5 ( mm), and the differences Δr1n and Δr2n of the groove radii are about ± 0.3 (mm). Therefore, when the pipes 10 and 10 to be joined are actually butted with each other, there is no step between the pipe groove shapes which are visually butted. And a gap gauge was used to determine whether the gap at the junction was uniform.

[0003]

However, in the conventional method, it is necessary to rotate the pipes to be actually joined to each other at a predetermined angle and measure them by abutting each other. could not. In addition, since the machining allowance could not be grasped numerically, it was necessary to perform inefficient work, such as performing the machining again after the machining and then measuring and machining. Further, there are many cases where the piping of a power plant or a plant is installed at a high place as shown in FIG. 17, and the repetition of the processing and the measurement is called lifting and fixing the pipe, measuring at a high place, hanging, and processing. ,
Dangerous work had to be repeated.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a groove shape measuring device for measuring a groove shape of a joint portion when butt-welding pipes, A displacement sensor for measuring at least one of axial displacement and radial displacement of the pipe end face,
A rotation unit for rotating the displacement sensor along a pipe end face; an angle detection unit for detecting a rotation angle of the rotation unit; and a mounting jig for mounting the rotation unit to an end of the pipe. And a mounting jig having a guide member for rotatably supporting the rotating means and positioning the rotating surface of the rotating means so as to be orthogonal to the center axis of the pipe.

According to the present invention, there is provided a displacement sensor for measuring at least one of an axial displacement and a radial displacement of a pipe end face, and a rotating means for rotating the displacement sensor along the pipe end face. An angle detecting means for detecting a rotation angle of the rotating means, and a mounting jig for mounting the rotating means to an end of a pipe, wherein the rotating means is rotatably supported, and A mounting jig with a guide member that positions the rotating surface so as to be perpendicular to the center axis of the pipe is provided, so that the groove shape can be measured separately on the ground and the additional work of the groove is known. The groove can be easily machined.

In order to achieve the above object, the invention according to claim 2 provides a means for obtaining a distance from a rotation center position of the displacement sensor to an origin of the displacement sensor, and a displacement sensor based on the rotation center position of the displacement sensor. Distance to the origin of the
The height and outer diameter of the pipe end face at a plurality of rotation angles from the axial displacement and the radial displacement of the pipe end face measured by the displacement sensor, and the rotation angle when the displacement sensor is rotated along the pipe end face. And means for calculating the inner diameter of the groove, and display means for displaying the result of the calculation.

According to the present invention, means for determining a distance from the rotation center position of the displacement sensor to the origin of the displacement sensor, a distance from the rotation center position of the displacement sensor to the origin of the displacement sensor, From the measured axial displacement and radial displacement of the pipe end face, and the rotation angle when the displacement sensor is rotated along the pipe end face, the height, outer diameter and groove of the pipe end face at a plurality of rotation angles are determined. The provision of the means for calculating the inner diameter and the display means for displaying the calculation result makes it possible to easily and accurately know the groove shape, outer diameter, and axial displacement of the pipe end face of the pipe end face.

According to a third aspect of the present invention, there is provided a groove shape measuring method for measuring a groove shape of a joint portion when butt-welding pipes. The groove shape measuring device according to claim 1 is attached to a first pipe, and the displacement sensor is rotated to a plurality of rotation positions. At each rotation position, an axial displacement of the end face of the first pipe from the displacement sensor is determined. At least one of radial displacements is taken in, the groove shape measuring device of claim 1 is attached to a second pipe abutted with the first pipe, and the displacement sensor is rotated to a plurality of rotational positions. First and second fetching of at least one of the axial displacement and the radial displacement of the end face of the second pipe from the displacement sensor at each rotational position at each rotational position. Axial displacement of the end face of the pipe and first and second on the basis of at least one of radial displacement
The groove gap, the outer diameter step and the inner diameter step at the time when the pipes are butted are obtained.

According to the present invention, the groove shape measuring device according to claim 1 is attached to a first pipe, the displacement sensor is rotated to a plurality of rotation positions, and the displacement sensor is connected to the first pipe at each rotation position. Capturing at least one of an axial displacement and a radial displacement of the end face of the end face, attaching the groove shape measuring device according to claim 1 to a second pipe abutted with the first pipe, and mounting the displacement sensor. While rotating to a plurality of rotation positions, at each rotation position, at least one of the axial displacement and the radial displacement of the end face of the second pipe is taken in from the displacement sensor at each rotation position. A groove gap at the time of abutment of the first and second pipes based on at least one of an axial displacement and a radial displacement of an end face of the second pipe;
Since the outer diameter step and the inner diameter step are determined, the groove shape can be measured separately between the pipes on the ground, and the additional processing time of the groove can be known, so that the groove processing is facilitated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a pipe groove shape measuring apparatus and method according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a measurement state in which a measuring device mechanism according to the present invention is attached to a cut surface of a pipe end surface to be measured.

At the end face joint portion of the pipe 10, a welding groove is formed for securely welding the pipe. The two-dimensional displacement sensor 14 of the groove shape measuring device 12
The laser beam spot 16 is irradiated while scanning the edge of the opening of the pipe 10 to measure the two-dimensional shape of the groove of the opening of the pipe 10. The two-dimensional displacement sensor 14 is an arm 1 that can be extended in a radial direction (a direction B in FIG. 1) with respect to a sensor rotation axis A that is a rotation axis of a rotation unit in the groove shape measuring device 12.
8 according to the diameter of the pipe 10.
The measurement position of the dimensional displacement sensor 14 can be adjusted.
Reference numeral 20 denotes a rotating block which holds a sliding portion of the arm 18 and rotates about a rotation axis A of the sensor. The clamp lever 22 is a handle for fixing the extension slide of the arm 18 during measurement. The method of fixing the sensor rotation axis A in the rotation direction at the time of measurement is as follows.
6 is achieved by dropping the tip. The positioning holes 24 are provided around the sensor rotation axis A by the number of measurement points. In a normal state, the plunger 26 is configured to be pushed in the direction of the positioning hole by the force of a spring (not shown), so that the rotation of the sensor rotation axis A is restricted. When the position of the sensor 14 is rotated around the sensor rotation axis A after the measurement is completed, the tip of the plunger 26 is pulled out from the positioning hole 24 by pulling the knob of the plunger 26, and the rotary block 20 becomes rotatable.

The slide base 30 is slidably fixed to the V-shaped holder 32 at right angles to the pipe 10 and substantially toward the center of the pipe 10. The positional relationship between the slide base 30 and the V-shaped holding table 32 is determined according to the diameter of the pipe 10 to be measured such that the sensor rotation axis A of the slide base 30 is substantially at the center of the pipe 10. The clamp lever 34 is a handle for fixing the slide of the slide base 30.

A bearing (not shown) is provided inside the slide base 30 for rotating the sensor rotation shaft A, and holds a shaft (not shown) fixed to the rotation block 20. The shaft of the angle detecting means 36 is connected to the rear end of the shaft via a coupling (not shown). The angle detection means in the present embodiment uses an optical rotary encoder which is generally commercially available,
The present invention is not limited to this, and the object can be achieved even if the angle detecting means is merely a scale as long as the angle can be read. The stator (case) of the angle detecting means 36 is fixed to the slide base 30,
The angle detecting means 36 includes the slide base and the rotating block 20.
And the angle difference between them is detected.

The V-shaped holding table 32 is fixed by a fixing belt 38 in parallel with the pipe 10. At this time, the groove shape measuring device is fixed so that the origin mark 40 around the rotation axis A and the origin mark 40 (the point of interest for matching between the pipes) written on the pipe 10 coincide. FIG. 2 shows a configuration diagram of an information processing unit of the pipe groove shape measuring device according to the present invention. The two-dimensional shape information obtained by the two-dimensional displacement sensor 14 is processed by the sensor control unit 50. The two-dimensional displacement sensor 14 uses a triangulation type laser beam sensor to measure the displacement in the vertical direction (Z direction) in FIG.
This is a two-dimensional displacement sensor that can measure the height in the Z direction at a radial position by scanning a laser beam in the radial direction (r direction) of the pipe 10. The sensor control unit 50 controls the two-dimensional displacement sensor 14 and has a function of processing a signal from the two-dimensional displacement sensor 14, a function of displaying the signal, and a function of communicating with the host computer 52.

The position pulse from the angle detecting means 36 is sent to a counter card 54 and converted into position data.
The counter card 54 can perform setting, resetting, and data reading of the counter in response to a command from the host computer 52. The three-dimensional shape of the pipe end face joint can be grasped by the above-mentioned device. Further, the length of the arm 18 and the position of the sensor rotation axis A can be easily adjusted according to the diameter of the pipe to be measured.

In the above example, a description has been given of an example in which a slide-type adjusting mechanism is provided for the mechanism for adjusting the length of the arm 18 and the position of the sensor rotation axis A. It is also conceivable. In the above example, an example in which only one V-shaped holding table 32 is provided has been described.
In order to more securely hold the groove shape measuring device 12,
It is also conceivable to provide a total of two V-shaped holders on the opposite side of the V-shaped holder 32 with the slide base 30 interposed therebetween.

An embodiment using a groove shape measuring apparatus according to the present invention will be described below with reference to the drawings. FIG. 3 is a flowchart showing a flow of the entire measurement. In the embodiment shown in FIG. 3, in step 131, the end face of the master pipe 60 is measured to calibrate the pipe groove shape measuring device 12. Then step 1
The end face of the first pipe is measured at 34 and then at step 137
Then, the end face of the second pipe to be welded to the first pipe is measured. When the measurement is completed, the first and second pipe measurement results are displayed in step 139, and the operator corrects the groove shape of the pipe connection based on the display results. Before and after the measurement, mounting adjustment and removal of the pipe groove shape measuring device 12 are performed.

First, in order to obtain a dimension LA corresponding to the length of the arm 18 shown in FIG. 2, the diameter is substantially equal to the pipe to be measured, the outer diameter is measured in advance, and the roundness is within a specified range. In order to measure the inside of the master tube 60 (see FIG. 5A), an operation of attaching the groove shape measuring device to the master tube 60 (step 130 in FIG. 3) is performed. After the groove shape measuring device 12 is placed at the opening of the master tube as shown in FIG. Next, the positional relationship between the V-shaped holding table 32 and the slide base 30 is adjusted so that the rotation center of the sensor is substantially at the center of the master tube 60. Next, the laser beam spot 16 of the two-dimensional displacement sensor 14
The positional relationship between the arm 18 and the rotating block 20 is adjusted so that the end face of the master tube 60 falls within the entire scanning range.

Next, the measurement of the master tube 60 shown in step 131 of FIG. 3 is performed. Details of step 131 in FIG.
It is shown in When the setting of the groove shape measuring device 12 to the master pipe 60 is completed, the host computer 52 is instructed to measure the master pipe 60, and at step 140, the master pipe 60 is measured.
Enter the outside diameter of. Thereafter, steps 141 and 142
The outer diameter portion LMn (subscript n is the number of the measurement point) of the master tube is measured at three or more points in a wide range as possible. The arm angle measured by the angle detecting means 36 and the data measured by the two-dimensional displacement sensor 14 are stored in steps 143 and 144.
Is processed independently. When the data received from the two-dimensional displacement sensor 14 is subjected to processing such as smoothing in the sensor control unit 50 in step 145, the two-dimensional shape shown in the graph shown on the display unit of the sensor control unit 50 in FIG. Is obtained. The horizontal axis of the graph in FIG. 5A indicates the distance from the origin of the two-dimensional displacement sensor 14, and the vertical axis indicates the height of the end face of the master tube 60. Further, data is sent to the host computer 52 in order to make it easier to determine the position LMn of the outer diameter portion of the master tube 60, where the two-dimensional shape obtained by the sensor control unit 50 is differentiated twice by LM in step 146. 5 (B). In the edge determination in step 147, the point at which the height differential value Z ″ rises from negative to positive in FIG. 5B is defined as LMn. The outside of the master tube 60 obtained by repeatedly measuring at each angle in this manner. The arrangement of points at the radial position is shown in Fig. 6. In Fig. 6, the length LA of the arm is shown.
And the position differences aM and bM between the sensor rotation center A and the center position OM of the master tube 60 are unknown, but the values of LMn at three or more measurement points and the outer diameter DM of the master tube 60 stored in advance are Can determine an unknown (step 150). The length LA of the arm obtained here is stored in the storage means (step 151). Since the length LA of the arm is used in the calculation after the measurement, the amount of extension of the arm 18 with respect to the rotary block 20 must not be changed until the end face measurement of the first pipe and the second pipe is completed. If the extension amount of the arm 18 with respect to the block 20 is changed, the master tube is measured again to obtain a new arm length LA.

When the length LA of the arm is known in advance, the calibration may be omitted only by inputting and storing the known length LA of the arm in the storage device. Next, the end face measurement of the first pipe 10 described in step 133 and subsequent steps in FIG. 3 is performed. In step 133, after the origin mark 40 of the first pipe 10 is aligned with the origin of the groove shape measuring device, the groove shape measuring device 12 is moved to the first position in the same manner as when the opening end face of the master tube 60 is measured. Attach to the pipe opening. When the setting is completed, the two-dimensional displacement sensor 141 is rotated around the sensor rotation axis A, and the measurement point is adjusted to the position where the origin mark 40 of the pipe 10 exists.

When the setting is completed, the routine proceeds to step 134. Step 134: first piping measurement;
7 is the same as the second piping measurement method, and details are shown in FIG. When performing the pipe end face measurement, the host computer 52 is instructed to measure the first pipe 10. Thereafter, Ld1mn (subscript m indicates a measurement point in the radial direction of the pipe 10 and subscript n indicates a measurement point on the circumference) of the first pipe shown in Steps 181 and 182 of FIG. Measure at 8 points at the above determined angle. In this example, eight points are measured, but data analysis is possible if there are three or more measurement points on the same circumference. The arm angle measured by the angle detecting means 36 and the data measured by the two-dimensional displacement sensor 14 are processed independently in steps 183 and 184. In step 185, when the data received from the two-dimensional displacement sensor 14 is subjected to processing such as smoothing by the sensor control unit 50, the data shown in the graph shown in the display section of the sensor control unit 50 in FIG. A dimensional shape is obtained. The horizontal axis of FIG. 8A indicates the distance from the origin of the two-dimensional displacement sensor 14,
The vertical axis represents the height of the end face of the first pipe 10. Further, in step 186, in order to easily determine the outer diameter portion Ld11n of the first pipe 10 and the position Ld12n of the groove inner diameter edge,
When the two-dimensional shape data obtained by the sensor control unit 50 is transmitted to the host computer 52 and differentiated by Ld, the result is as shown in FIG. Further, by further differentiating, data shown in FIG. 8C is obtained. Step 187
In the edge judgment of (2), the second point from the origin direction of the point where the differential value Z ″ P of the height data of the end face of the pipe 10 in FIG.
Then, measurements at other measurement points are determined, and data at each angle is obtained. In step 189, the point Ld12n of the outer diameter position of the first pipe 10 obtained in this way and the angle detecting means 36
The calculation of the arrangement with θn obtained by the above is integrated. FIG.
(A), at arbitrary measurement points l, m, n (l is a pipe number, m is a measurement point in the radial direction of the pipe 10, and n is a measurement point on the circumference of the pipe 10). X and Y coordinate values obtained
It is shown in (B). In FIG. 9A, the sensor rotation center A
Aw and bW between the center position Ow of the first pipe 10 and the center position Ow.
Is an unknown, but the unknown can be determined from the values of the outer diameter Ld12n at three or more measurement points and the length LA of the arm stored in advance (step 190). If the number of measurement points is three, calculation is performed using a circle passing through the three measurement points. If the number of measurement points is four or more, an optimal circle is calculated using a method such as the least square method. The coordinate origin of the measurement point is shifted from A to OW using the obtained aW and bW. FIG. 9C shows the X, Y coordinate values at the measurement points l, m, n when the coordinate origin is converted to OW. Further, when the measurement point is converted into the r, θ coordinate system, the coordinates of the measurement point have the values shown in FIG. In the groove shape measuring device 12 according to the present invention, since the setting of the measuring device is facilitated, the aW,
Since there is a shift of bW, the measurement point 1 at the position of the origin mark 40 also has an angle of θ1 as shown in FIG. Therefore, θ1 is subtracted from θn of all the measurement points, and the angle θ of the other measurement points is represented by a relative angle with the measurement point 1 as the origin of the angle 0.

Next, data processing in the height direction will be described. Data Zpmax of the maximum value (the position closest to the two-dimensional displacement sensor 14) among the data Zpln in the height direction is defined as:
With this value as height = 0 (mm), all height data are Z
The data is shifted by calculating ln = Zpmax-Zpln. The thus obtained r1mn and θn of each measurement point and the height Zln at each measurement point are stored in a storage device in the host computer 52. FIG. 10 shows an example in which the stored values of r and θ are displayed on a host computer screen. In the example of FIG. 10, the error of the data rl1n and rl2n of the measurement point at each angle is enlarged and shown in a circle indicating the values of rl11 and rl21. In FIG. 11, the horizontal axis represents the angle θ of each measurement point.
FIG. 11 is a diagram in which the vertical axis is set to rl1, rl2, and Zl for (°), and the error is also enlarged similarly to FIG. FIG.
In FIG. 11 and FIG. 11, the data at each measurement point is connected by a straight line, but may be connected by a quadratic or higher-order curve.

In the same manner as the end face measurement of the first pipe,
The end face measurement of the second pipe shown in step 137 of FIG. 3 is performed. The r2mn, .theta.n of each measurement point and the height Z2n at each measurement point obtained in the same manner are stored in a storage device in the host computer 52 and displayed. Next, the calculation and display of the dimensional difference when the first and second pipes are assumed to be joined will be described with reference to FIG. 12 which is a detailed view of step 139 in FIG. First, in step 221 in FIG. 12, in order to obtain a radius difference Δr1 at an angle θ1 °,
The outer radius r211 of the second pipe is subtracted from the outer radius r111 of the first pipe. Next, ΔZ1 corresponding to the gap is calculated from the data in the height direction. ΔZ1 can be represented by Z11 + Z21. When the calculation is completed, it is determined in step 223 whether the calculation is to be performed at the next angle n + 1. If the calculation is to be performed in n + 1, n + 1 is substituted for n in step 224, and then the calculation is performed again in step 221. When all calculations have been completed, the process proceeds to step 225, where the measurement and calculation results are displayed. FIGS. 13, 14, and 15 show display examples of calculation results. FIG. 13 is a diagram in which the error at each angle between the radius data 71 of the first pipe and the radius data 72 of the second pipe is enlarged and superimposed, and the maximum value of the error in each direction is numerically displayed. I have. In particular, as shown in FIG.
If it is considered that the error at the time of joining is considered to decrease when the pipe and the second pipe are rotated by about 90 ° relative to each other, the apparatus has a function of rotating and examining the data by an arbitrary angle on the display screen. When it is instructed to shift the display angle in step 226 in FIG. 12, the process proceeds to step 227, and the angle to be shifted is input. Steps 221, 223, and 2 again
After calculating all Δrmn and ΔZn in 24, they are displayed in step 225. In this description, the operator determines and inputs the shift angle while looking at the display screen. However, the convergence calculation is performed so that the sum of the absolute values of the radius differences Δrmn at each angle is minimized, and the shift is automatically performed. It is also possible to find the optimum angle as much as possible.

FIG. 14 shows the height data Z1n of the first pipe.
And the error at each angle of the radius data Z2n of the second pipe is enlarged and plotted, and the maximum value is displayed numerically. FIG.
FIG. 5 shows an example in which the calculated Δr1, Δr2, and ΔZ are represented by a graph of the angle θ on the horizontal axis. The groove is machined based on the groove shapes of the end faces of the first and second pipes to be joined measured and obtained as described above, and the respective pipes are welded.

Further, according to another embodiment of the present invention, it is conceivable to configure a pipe groove shape measuring device that runs on the outer periphery of the pipe as shown in FIG. An outer periphery traveling pipe groove shape measuring device 80 shown in FIG. 16 measures a base 82 holding each component and a shape of a pipe end face.
The dimensional displacement sensor 14, a guide roller 84 running around the outer circumference of the pipe, the angle detecting means 36 for detecting the rotation angle of the guide roller 84, and the guide roller 84 always connecting the pipe 1
0 to the base 82 to make contact with the outer circumference of
The trailing arm 85 generates a rotational force for pressing down the inner wall of the pipe 0, and a push roller 86 attached to the trailing arm 85 and pushing the inner wall of the pipe 10. When the above-described outer periphery traveling pipe groove shape measuring device 80 is attached to the pipe 10 and is started from the origin mark 40 and goes around the outer periphery of the pipe 10 and stops again when reaching the origin mark 40, a guide which is measured in advance The outer peripheral length and diameter of the pipe 10 can be obtained from the outer diameter of the roller 84 and the measured rotation angle of the angle detecting means 36. Next, the groove shape measuring device 80 for the outer peripheral traveling type pipe is again adjusted to the position of the origin mark 40, and the groove shape of the pipe is measured by the two-dimensional displacement sensor 14. If the groove shape of the pipe 10 is measured at eight places, the host computer 52 indicates a position obtained by dividing the outer diameter of the pipe 10 obtained above into eight equal parts, and the operator places an opening for the outer peripheral traveling type pipe at that position. The groove shape is measured by setting the groove shape measuring device 80. After measurement at a plurality of measurement points, the measurement result is calculated and displayed as described above.

[0026]

As described above, according to the pipe groove shape measuring apparatus of the present invention, a displacement sensor for measuring at least one of an axial displacement and a radial displacement of a pipe end face is provided. A rotating means for rotating the displacement sensor along the pipe end face, an angle detecting means for detecting a rotation angle of the rotating means, and a mounting jig for mounting the rotating means to an end of the pipe. There is provided a mounting jig having a guide member for rotatably supporting the rotating means and positioning the rotating surface of the rotating means so as to be orthogonal to the center axis of the pipe, so that the groove shape can be measured. Pipes can be formed separately on the ground, and the amount of additional work for the groove can be known, so that groove processing is facilitated.

The apparatus for measuring the shape of a groove for piping includes means for calculating a distance from the center of rotation of the displacement sensor to the origin of the displacement sensor, and a distance from the center of rotation of the displacement sensor to the origin of the displacement sensor. The height of the pipe end face at a plurality of rotation angles from the axial displacement and the radial displacement of the pipe end face measured by the displacement sensor, and the rotation angle when the displacement sensor is rotated along the pipe end face. By providing a means for calculating the diameter and the inner diameter of the groove and a display means for displaying the calculation result, it is possible to easily and accurately know the groove shape of the pipe end face, the outer diameter and the axial displacement of the pipe end face. Can be.

The groove shape measuring apparatus for a pipe is a groove shape measuring method for measuring a groove shape of a joint portion when butt-welding pipes. Attach the shape measuring device to the first pipe, rotate the displacement sensor to a plurality of rotation positions, and, at each rotation position, the axial displacement and the radial displacement of the end face of the first pipe from the displacement sensor. The groove shape measuring device according to claim 1, wherein at least one of
Attached to a second pipe abutted with the pipe, the displacement sensor is rotated to a plurality of rotation positions, and at each rotation position, the axial displacement and the radial displacement of the end face of the second pipe from the displacement sensor And at least one of the first and second rotation positions.
The groove gap, the outer diameter step and the inner diameter step when the first and second pipes are butted are determined based on at least one of the axial displacement and the radial displacement of the end face of the pipe. The shape can be measured separately from each other on the ground, and the additional work of the groove can be known, so that the groove can be easily machined.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a measurement state in which a groove shape measuring device mechanism according to the present invention is attached to a pipe to be measured.

FIG. 2 is a diagram showing a state in which a groove shape measuring device mechanism according to the present invention is attached to a pipe to be measured and a configuration of an information processing unit.

FIG. 3 is a flowchart showing an entire measuring method of the groove shape measuring apparatus according to the present invention.

FIG. 4 is a flowchart showing a method of measuring a master pipe end surface of the groove shape measuring apparatus according to the present invention.

FIG. 5A is a perspective view showing a master pipe end face measuring method of the groove shape measuring apparatus according to the present invention and a display example of a sensor control unit. (B) is a diagram showing an example of the result obtained by differentiating the two-dimensional data of the master tube end face twice in the groove shape measuring apparatus according to the present invention.

FIG. 6 is a view showing measurement points on a master pipe end face of the groove shape measuring apparatus according to the present invention.

FIG. 7 is a flowchart showing a method of measuring a pipe end surface of the groove shape measuring apparatus according to the present invention.

FIG. 8A is a perspective view showing a method of measuring a pipe end surface of the groove shape measuring apparatus according to the present invention, and a view showing a display example of a sensor control unit. (B) is a diagram showing an example of the result of one-time differentiation of the two-dimensional data of the master tube end face of the groove shape measuring apparatus according to the present invention. (C) is a diagram showing an example of a result obtained by differentiating two-dimensional data of the master tube end face twice in the groove shape measuring apparatus according to the present invention.

FIG. 9A is a diagram showing measurement points on a pipe end surface of the groove shape measuring device according to the present invention. (B) is a measurement point lm according to the present invention.
X and Y coordinate values with A as the origin. (C) X and Y coordinate values with the origin of OW of the measurement point lmn according to the present invention. (D)
Is the r, θ coordinate value with the origin of the OW of the measurement point lmn according to the present invention.

FIG. 10 is a diagram showing a display example of a pipe shape measurement result of the groove shape measuring device according to the present invention.

FIG. 11 is a view showing a display example of a pipe shape measurement result of the groove shape measuring device according to the present invention.

FIG. 12 shows first and second embodiments of the groove shape measuring apparatus according to the present invention.
5 is a flowchart showing a method of displaying a pipe measurement result.

FIG. 13 is a view showing a display example of a pipe shape measurement result of the groove shape measuring device according to the present invention.

FIG. 14 is a view showing a display example of a pipe shape measurement result of the groove shape measuring device according to the present invention.

FIG. 15 is a view showing a display example of a pipe shape measurement result of the groove shape measuring device according to the present invention.

FIG. 16 is a diagram showing a pipe groove shape measuring device traveling on the outer periphery of the pipe.

FIG. 17 is a diagram showing a butt state of pipes.

FIG. 18 is a cross-sectional view showing a butt state and a groove shape of a pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Piping 12 ... Groove shape measuring device 14 ... Two-dimensional displacement sensor 16 ... Laser beam spot 18 ... Arm 20 ... Rotating block 22 ... Clamp lever 24 ... Positioning hole 36 ... Angle detecting means 52 ... Host computer

Claims (3)

[Claims] 1. A groove shape measuring device for measuring a groove shape of a joint portion when butting and welding pipes, wherein at least one of an axial displacement and a radial displacement of a pipe end face is measured. A displacement sensor for measuring one of the ends, a rotation unit for rotating the displacement sensor along a pipe end surface, an angle detection unit for detecting a rotation angle of the rotation unit, and an end of the pipe for the rotation unit. A mounting jig for mounting to the part, rotatably supporting the rotating means,
And a mounting jig having a guide member for positioning the rotating surface of the rotating means so as to be orthogonal to the center axis of the pipe. 2. A means for determining a distance from the rotation center position of the displacement sensor to the origin of the displacement sensor; a distance from the rotation center position of the displacement sensor to the origin of the displacement sensor; and a pipe end surface measured by the displacement sensor. The height, outer diameter and inner diameter of the groove at a plurality of rotation angles are calculated from the axial displacement and the radial displacement of the pipe and the rotation angle when the displacement sensor is rotated along the pipe end face. 2. A groove shape measuring apparatus according to claim 1, further comprising: means; and display means for displaying the calculation result. 3. A groove shape measuring method for measuring a groove shape of a joint portion when butt-welding pipes, wherein the groove shape measuring device according to claim 1 is used as a first pipe. attachment,
Rotating the displacement sensor to a plurality of rotational positions, and taking in at least one of an axial displacement and a radial displacement of an end face of the first pipe from the displacement sensor at each rotational position; A tip shape measuring device is attached to a second pipe that is brought into contact with the first pipe, and the displacement sensor is rotated to a plurality of rotation positions. At each rotation position, the axis of the end face of the second pipe is detected from the displacement sensor. And at least one of a radial displacement and a radial displacement. The first and second pipes are captured at each of the rotation positions based on at least one of the axial displacement and the radial displacement of the end faces of the first and second pipes. And a groove shape, an outer diameter step and an inner diameter step at the time of butting of the second pipe.