JPH0339614A - Tube sectional shape detector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pipe cross-sectional shape detection device for measuring the cross-sectional shape of a pipe such as a spiral pipe.

BACKGROUND OF THE INVENTION Conventionally, manufactured spiral pipes have welded parts in a spiral shape, and the roundness varies, so the elliptical shape has been measured to determine whether the product meets or fails the product specifications. For this reason, conventionally, the outer circumferential length of the tube was measured by winding a cord of measurement medium around the outer circumference of the spiral tube, and the tube outer diameter was calculated by dividing this outer circumferential length by pi.

Problems to be Solved by the Invention However, according to the above-described conventional configuration, since the measurement is performed manually, there are variations in the accuracy of the measured values.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a tube cross-sectional shape detection device that can perform measurement work mechanically and always detect the cross-sectional shape of a tube with constant accuracy.

Means for Solving the Problems In order to solve the above problems, the present invention provides a rotating device which is arranged in the radial direction of the pipe to be measured, facing the opening of the pipe to be measured, and rotates along the circumferential direction of the pipe to be measured. an arm section, a rotation angle detection device that detects the rotation angle of the rotating arm section, a movable pedestal that reciprocates in the radial direction of the pipe to be measured on the rotary arm section, and a rotation angle detection device that detects the rotation angle of the rotating arm section; a sensor section that is provided so as to be able to come into contact with and separate from the sensor section, a sensor drive device that biases the sensor section toward the circumferential surface of the pipe to be measured, and a displacement detection device that detects displacement of the sensor section with respect to the rotating arm section; The configuration includes a displacement detection device and a control device connected to the rotation angle detection device.

Moreover, the structure includes a sensor section that comes into contact with the outer circumferential surface of the tube to be measured and a sensor section that comes into contact with the inner circumferential surface of the tube to be measured.

Effect With the above-described configuration, the rotary arm portion is rotated in the circumferential direction of the tube to be measured while the sensor portion is in contact with the circumferential side of the tube to be measured. At this time, the sensor section responds to changes in the distance from the rotation axis of the rotating arm section to the circumferential surface of the tube to be measured.
It moves on the movable pedestal in the radial direction of the pipe to be measured against the biasing force of the sensor drive device. Then, while the rotation angle detection device detects the rotation angle of the rotary arm portion, the displacement detection device detects the displacement value of the sensor portion, and the displacement value of the distance from the rotation axis of the rotary arm portion to the sensor portion is determined for each rotation angle. stored in the control device each time. Then, the control device calculates the diameter of the tube to be measured at each rotation angle based on the displacement value and each rotation angle, and also calculates the ellipticity of the tube to be measured.

In addition, by arranging a pair of sensor parts inside and outside the pipe to be measured, one sensor part detects the displacement with respect to the outer peripheral surface of the pipe to be measured, and the other sensor part detects the displacement with respect to the inner peripheral surface of the pipe to be measured. Detect simultaneously. Therefore, the inner diameter and outer diameter of the pipe to be measured are calculated based on the loci of displacement of both sensor sections.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, a base 1 is placed facing the opening of a tube to be measured 2, and a lifting guide 3 is provided on the base 1 in the vertical direction. Further, the base 1 is provided with an elevating pedestal 4 guided by an elevating guide 3, and the base 1 and the elevating pedestal 4 are
In between, there is a screwing device 5 that drives the lifting pedestal 4 up and down.
is interposed. A rotary arm portion 6 is rotatably supported on the elevating pedestal 4 along the circumferential direction of the tube to be measured 2, and the rotary arm portion 6 is disposed in the radial direction of the tube to be measured 2. Further, a drive motor 7 for rotationally driving the rotary arm section 6 is provided on the lifting pedestal 4, and an encoder 8 for detecting the rotation angle is provided on the drive motor 7.

A movable pedestal 8 is provided on the rotary arm portion 6 so as to be movable in the radial direction of the tube to be measured 2 by being screwed into a ball screw lO provided in the axial direction of the rotary arm portion 6.

Further, the rotary arm portion 6 is provided with a ball drive device 11 that rotationally drives the ball screw lO. A pair of sensor sections 12 and 13 are provided on the movable base 9 so as to be movable in the radial direction of the tube 2 to be measured and to be able to sandwich the wall of the tube 2 to be measured. Furthermore, rodless air cylinders 14 and 15 are interposed between the movable base 9 and the sensor sections 12 and 13 to urge the sensor sections 12 and 13 in the radial direction of the tube 2 to be measured.

The sensor section 12.13 is provided with a linear encoder head 18.17, and the rotating arm section 6 is provided with a linear encoder 18. And encoder 8 and linear encoder spatula) '1lli.

17 and linear encoder I8 are connected to the control device via the signal line! Connected to 3.

Hereinafter, the effects of the above configuration will be explained.

When measuring the cross-sectional shape of the tube 2 to be measured, the lifting pedestal 4 is raised by the screw jack device 5 so that the axis of rotation of the rotary arm section 6 substantially coincides with the axis of the tube 2 to be measured. Then, drive the ball drive device 11 to drive the ball screw! Rotate 0 and ball screw! 0, the movable base 9 is moved to a position corresponding to the circumference of the tube to be measured 2, and the positioning of each sensor section 12.degree. 13 relative to the circumference of the tube to be measured 2 is roughly adjusted. At this time, the moving distance of the movable base 9 is determined by the linear encoder 18 provided on the rotary arm section 6 and the linear encoder head IG provided on each sensor section 12.13.
.

17.

And air cylinder 14. With the sensor parts 12 and 13 moved in the direction of separating them from each other by Is,
The tube to be measured 2 is moved toward the rotating arm section 6, and the wall of the tube to be measured 2 is positioned between the sensor sections 12 and 13. In this state, the rain sensor part 12.13 is held so that the pipe wall of the pipe to be measured 2 is held between the air cylinders 14 and 15.
is brought into contact with the circumferential side of the pipe 2 to be measured. At this time, the moving distance of the rain sensor section 12.13 is determined by the linear encoder 18 provided on the rotary arm section 6 and the linear encoder head 18 provided on each sensor section 12.13. 17.

Then, the rotary arm section 6 is rotated in the circumferential direction of the tube to be measured by the drive motor 7 while the sensor section 12.13 is in contact with the inner circumferential surface and the outer circumferential surface of the tube to be measured 2. At this time, the sensor section 12.13 moves the tube of the measurement object 2 on the movable base 9 according to the change in the distance from the rotation axis of the rotation arm section 6 to the inner peripheral surface and the outer peripheral surface of the measurement object tube 2. It moves in the radial direction against the urging force of the air cylinders 14 and 15. This is possible because the air cylinders 14.15 use air as the working fluid. Then, while the encoder 8 detects the rotation angle of the rotary arm section 6, the linear encoder head 18.17 and the linear encoder 18 detect the displacement value of the sensor section 12.13, and the sensor is detected from the rotation axis of the rotary arm section 6. The displacement value of the distance to the portion 12.13 is stored in the control device 19 for each rotation angle. Then, the control device 18 calculates the inner diameter and outer diameter of the tube 2 to be measured at each rotation angle based on the displacement value and each rotation angle, and also calculates the ellipticity of the tube 2 to be measured. Furthermore, variations in the wall thickness of the tube 2 to be measured are detected. Further, by making the support shaft of the sensor section 12.13 longer, it is possible to detect not only the end of the tube to be measured 2 but also the cross-sectional shape of the tube at an intermediate position of the tube to be measured 2Q.

Effects of the Invention As described above, according to the present invention, the sensor section is moved without rotating the pipe to be measured, and the measurement work is performed mechanically, so that the cross-sectional shape of the pipe, that is, the outer diameter, can be determined with constant accuracy. It is possible to detect variations in the inner diameter and tube wall thickness.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIG. 2 is a plan view taken along the line A-A in FIG. 1, and FIG. 3 is an enlarged side view of the sensor section of the same embodiment. The figure is a plan view taken along the line B--B in FIG. 3. 2... Pipe to be measured, 4... Lifting pedestal, 5... Screwing device, 6... Rotating arm section, 7... Drive motor, 8... Encoder, 9... Moving pedestal, 10・
...Ball screw, 12, 13...Sensor part, 14.1
5... Air cylinder, 16° 17... Linear encoder head, 18... Linear encoder, 19...
·Control device.

Claims (1)

[Claims] 1. A rotary arm portion that is arranged in the radial direction of the tube to be measured facing the opening of the tube to be measured and rotates along the circumferential direction of the tube to be measured, and a rotation angle of the rotary arm portion. a rotation angle detection device for detecting the angle of rotation, a movable pedestal that reciprocates in the radial direction of the pipe to be measured on a rotating arm portion, and a movable pedestal that is provided on the movable pedestal so as to be able to come into contact with and separate from the circumferential surface of the pipe to be measured. A sensor section, a sensor drive device that urges the sensor section toward the circumferential surface of the pipe to be measured, a displacement detection device that detects displacement of the sensor section with respect to the rotating arm section, and a connection to the displacement detection device and rotation angle detection device. A pipe cross-sectional shape detection device comprising: a control device provided as a pipe cross-sectional shape detection device. 2. The tube cross-sectional shape detection device according to claim 1, further comprising a sensor section that comes into contact with the outer circumferential surface of the tube to be measured and a sensor section that comes into contact with the inner circumferential surface of the tube to be measured.