JPH04286902A - Measuring and detecting apparatus for groove hump of pipe - Google Patents

Abstract

PURPOSE:To efficiently detect a groove hump which occurs in a circular groove formed on an inner peripheral surface of a metal pipe while failure in measurement and detection is prevented. CONSTITUTION:A pipe wall part of a circular groove 3 on an inner periphery of a metal pipe 1 is interposed from inside and outside the pipe between a pair of wheels 4,5. While a distance between both wheels 4,5 is measured by a laser sensor 7, the metal pipe 1 is rotated around its axial center. If a groove hump exists, the wheel 4 on the side of the inner periphery is pushed out thereby increasing the distance between both wheels 4,5 so that whether or not the humb exists can be sensed.

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 and detecting grooves formed in grooves formed on the inner peripheral surface of a pipe such as a cast iron pipe.

0002

[Prior Art] When a tube body is cast by centrifugal casting or the like and painted, groove bumps such as cast burrs and smudges may occur in the groove formed on the inner peripheral surface of the socket of the tube body. There is. If such grooves remain, the quality of the product deteriorates, so inspections are required to detect and remove them. Conventionally, this inspection is generally performed visually.

0003

[Problems to be Solved by the Invention] However, the above-mentioned visual inspection has problems in that it is inefficient and requires a large number of man-hours. There is also a risk that inspections may be omitted due to oversight.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve these problems, prevent omissions in detection, and enable efficient measurement and detection of grooves and bumps.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a pair of wheels that sandwich the pipe wall of a groove portion formed on the inner circumferential surface of a pipe body such as a cast iron pipe from the inside and outside of the pipe body; The structure includes means for measuring the distance between the wheels and means for rotating the tube about its axis.

[0006]

[Operation] In such a structure, when the measuring means performs measurement while rotating the tubular body by the rotating means, the thickness of the tube wall of the groove portion over the entire circumference of the tubular body is measured. If a groove exists in the groove, the wheel on the inside of the tube is pushed away by the groove, increasing the distance between the two wheels. By measuring this with the measuring means, the presence or absence of the groove can be detected.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a cast iron pipe, and has a socket 2 at one end thereof. An annular groove 3 for accommodating a packing is formed on the inner periphery of the socket 2. An inner wheel 4 is in contact with the bottom surface of the annular groove 3, and an outer wheel 5 is in contact with the outer surface of the tube corresponding to the position of the inner wheel 4, so that the tube between the wheels 4 and 5 is wall part 6
is sandwiched between. A laser sensor 7 is attached to the inner wheel 4 and is capable of measuring the distance between both wheels 4 and 5. The laser sensor 7 is connected to a computer 8 for processing measurement data from the laser sensor 7.

FIGS. 3 and 4 show the overall configuration of the measuring device. The cast iron pipe 1 is horizontally supported by wheels (not shown) and rotated about its axis. 9 is a trolley, and the rail 1 is moved by a drive motor 10.
1 in the axial direction 12 of the cast iron pipe 1. A support portion 13 is provided on the trolley 9, and the outer peripheral side wheel 5 is
The support portion 13 supports the cast iron pipe 1 so as to be rotatable around an axis parallel to the axis. Further, the outer peripheral wheel 5 is guided by the guide member 14 and is movable in the vertical direction. The support part 13 has a spring 15, and this spring 15
can press the outer peripheral wheel 5 upward, that is, toward the outer surface of the cast iron pipe 1.

A support 16 for the inner wheel 4 is provided on the truck 9, and the support 16 can be moved vertically by a drive motor 18 while being guided by a guide bar 17. . A support member 19 is further provided inside the support body 16, and this support member 19 is guided to be movable up and down by a guide member 20, and is elastically supported from below by a spring 21.

The laser sensor 7 is attached to the support member 19, and the laser sensor 7 is attached to the support member 13.
By irradiating a suitable part of the wheel 4 and measuring the distance to the support part 13, both wheels 4 can be irradiated as described above.
, 5 can be measured. Further, a proximity sensor 22 is attached to the support 16, and this proximity sensor 22 is used to detect the relative position of the cast iron pipe 1 and the inner wheel 4.

Reference numeral 23 denotes a locking device, which has a column 24 and an operating lever 25, as shown in FIG. Post 24
is provided on the trolley 9. The operating lever 25 has a horizontal pin 26 at the upper end of the support column 24.
It is swingably supported around the Operation lever 25
One end is engaged with the support body 16, and the other end is engaged with the support portion 13. Therefore, when the support body 16 is moved upward by the drive motor 18, the operation lever 25
is pushed down against the spring 15, and both wheels 4
, 5 are locked in a state where the distance between them is wide. Conversely, when the support body 16 is moved downward by the drive motor 18, the engagement between the operating lever 25 and the support part 13 is released, the support part 13 is pushed upward by the action of the spring 15, and both wheels 4 , 5 approach each other.

Next, a method for measuring grooves will be explained. Once the cast iron pipe 1 is carried into the measurement position, this cast iron pipe 1
is supported horizontally and rotated around its axis. Next, with a distance between both wheels 4 and 5, the cart 9 is advanced by the drive motor 10 to approach the cast iron pipe 1, and when the proximity sensor 22 detects the end of the cast iron pipe 1, it is stopped. . At this time, the inner circumferential wheel 4 enters the inside of the cast iron pipe 1 and faces the annular groove 3.

In this state, the drive motor 18 is driven to lower the support 16 so that the support 16 comes into contact with the bottom surface of the annular groove 3. Then, the support body 16 starts to rotate following the rotation of the cast iron pipe 1 while being elastically supported by the spring 21. Also, at the same time, the locking device 23 is released,
The support part 13 is pushed upward by the spring 15 and pressed against the outer surface of the cast iron pipe 1, and also starts to rotate following the rotation of the cast iron pipe 1. FIG. 1 shows the state at this time.

While the cast iron pipe 1 rotates, for example, twice, the distance between the two wheels 4 and 5 is measured by the laser sensor 7, and the data is sent to the computer 8 and stored. At this time, if a groove bump is present, the inner peripheral wheel 4 is pushed up by the groove bump, and the distance between both wheels 4 and 5 increases. FIG. 6 shows an example of a groove hump 27. In the figure, (a) shows a good product with no grooves, and (b)
) shows a case where a small groove bump 27 exists at the bottom of the annular groove 3, and (c) shows a case where a large groove bump 27 exists at the bottom of the annular groove 3. (d) shows a case where a groove bump 27 exists on the side of the annular groove 3, and (e) shows a case where a smear of paint on the inner surface of the tube exists as a groove bump 27.

FIG. 2 shows an example of measurement data. The horizontal axis is time, that is, the position in the circumferential direction on the inner surface of the tube, and the vertical axis is the measured value. Point A in FIG. 2 indicates a portion where grooves and bumps are not present, as shown in FIG. The measurement data 28 at this point A is
From the laser sensor 7 to the inner wheel 4 in FIG.
, the distance b from the outer circumferential surface of the outer circumferential wheel 5 to the laser beam irradiation surface, and the thickness c of the tube wall portion 6. Point B in FIG. 2 indicates a portion where grooves and bumps exist, and here, a peak 29 as shown appears in the measurement data 28. d is the height of the groove hump. If a point near point B is used as point A, there is no substantial difference in the thickness c of the tube wall portion 6 between both points A and B. Find the height d of the groove hump.

When the measurement is completed, the support 16 is raised by the drive motor 18 and moved away from the annular groove 3. At this time, as shown in FIG. 5, the support part 13 is pushed down by the locking device 23 against the spring 15, and the outer peripheral wheel 5 is also simultaneously moved away from the cast iron pipe 1 and locked in that state. During this time, the presence or absence of grooves and bumps is determined from the measurement data. Next, the cart 9 is moved backward and separated from the cast iron pipe 1. When the tube is finally removed, one measurement cycle is completed.

FIGS. 7 and 8 show another embodiment of the measuring and detecting device according to the invention. Here, in order to support the outer wheel 5, a support body 31 similar to that for the inner wheel 4 is provided. This support body 31 is guided in the vertical direction by a guide bar 17 and is driven up and down by a drive motor 32. A support member 33 is provided inside the support body 31, and the outer peripheral wheel 5 is guided by this support member 33 so as to be movable in the vertical direction. 34 is a guide member. The support member 33 is the spring 1
5 and is elastically supported from below.

In the example shown in FIGS. 7 and 8, the outer wheel 5 is moved up and down by the drive motor 32, so the locking device shown in FIG. 5 is not provided. Moreover, even if a transmission type photoelectric switch 35 as shown in FIG. 7 is used instead of the proximity sensor 22 shown in FIG.
The relative position between the inner wheel 4 and the inner wheel 4 can be detected.

[0019]

Effects of the Invention As described above, according to the present invention, a pair of wheels sandwich the pipe wall of the groove portion formed on the inner circumferential surface of a pipe body such as a cast iron pipe from the inside and outside of the pipe body, and the distance between the two wheels is fixed. Since the configuration has a means for measuring the amount of grooves and a means for rotating the tube around its axis, by performing measurements while rotating the tube, it is possible to determine the presence or absence of grooves and their size over the entire circumference of the tube. It is possible to easily test the quality of the test, improve work efficiency for this test, and prevent omissions in the test.

[Brief explanation of the drawing]

1 is a diagram illustrating the operating principle of a gutter hump measuring and detecting device according to the invention; FIG.

FIG. 2 is a diagram showing an example of measurement data based on an embodiment of the present invention.

FIG. 3 is an overall front view of a gutter hump measuring and detecting device according to an embodiment of the present invention.

FIG. 4 is an overall side view of the measurement and detection device.

FIG. 5 is an enlarged detail view of the locking device in FIG. 3;

FIG. 6 is a diagram showing various aspects of grooves to be measured.

FIG. 7 is an overall front view of a gutter hump measuring and detecting device according to another embodiment of the present invention.

8 is an overall side view of the measurement and detection device of FIG. 7. FIG.

[Explanation of symbols]

1 Cast iron pipe 3 Annular groove 4 Inner wheel 5 Outer wheel 7 Laser sensor 27 Groove hump

Claims (1)

[Claims] 1. An apparatus for measuring groove bumps formed in a groove formed on the inner circumferential surface of a pipe body such as a cast iron pipe, comprising: a pair of wheels that sandwich the pipe wall of the groove from the inside and outside of the pipe body;
1. An apparatus for measuring and detecting grooves in a tube body, comprising means for measuring the distance between both wheels, and means for rotating the tube about its axis.