JPH0753295B2 - Device for measuring the inner diameter of the pipe and correcting the ellipse - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring a pipe inner diameter and correcting an ellipse.

2. Description of the Related Art Conventionally, cast tubes have variations in circularity, and a measuring device for inspecting the quality of the inner diameter of the tube is provided for each nominal diameter of the tube.

However, according to the above-described conventional configuration, there is a problem that the equipment cost increases because a measuring device for measuring the diameter of the pipe is provided for each nominal diameter of each pipe.

The present invention solves the above-mentioned problems, and is an apparatus for measuring the inside diameter of a pipe that corresponds to any diameter pipe and for easily correcting the inside diameter of the pipe and for correcting the ellipse. The purpose is to provide.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is directed to a sensor unit that is inserted and arranged inside a target tube and has an optical axis projected in the tube radial direction to measure the tube inner diameter. And a straightening device for pressing and expanding the target tube from the inside in the optical axis direction of the sensor part, and a driving device for moving the sensor part and the straightening device along the tube axis direction and rotating the tube around the tube axis center. And a control unit that controls the drive of the sensor unit, the correction device, and the drive unit, and the control unit rotates the sensor unit around the pipe axis of the target pipe by the drive unit to measure the pipe inner diameter and drive the drive unit. While moving the sensor part along the tube axis direction by the device, the inside diameter of the tube is measured and recorded at each position in the tube axis direction, and the target tube is compared by comparing the standard value recorded in advance with the detected value. While judging the roundness of The correction required position and the correction required amount are calculated, and the driving device and the correction device are controlled based on the calculated values to perform the elliptical correction of the target tube.

Action In the above configuration, the inner diameter of the pipe is measured while the sensor is positioned inside the target pipe while the sensor is rotated by the driving device. Then, based on the measured value, the control device determines the circularity of the target tube, and calculates the required correction position and the required correction amount. Then, based on the calculated value, the control device controls the drive device to move the correction device to the correction necessary position, and the correction device presses the required amount in the optical axis direction to appropriately correct the ellipse of the target tube. .

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a straightening device 2 is arranged inside a horizontally arranged target pipe 1, and the straightening device 2 is connected to a drive device 4 via a support shaft 3 along the pipe axis direction. It is supported. Further, the drive device 4 is configured to cause the support shaft 3 to move in and out in the tube axis direction and rotate around the tube axis.

Further, the straightening device 2 has a pair of cylinder portions 5 that extend and retract in the radial direction of the pipe, and both cylinder portions 5 are provided so as to face each other, and the target pipe 1 is pressed from the inside in the pipe diameter direction. It is designed to be expanded. Further, each cylinder part 5 is provided with a sensor part 6 for projecting a laser beam in the tube radial direction, and the optical axis 6a of the laser beam projected from both sensor parts 6 is along the tube diameter direction. It becomes a thing. Further, each cylinder portion 5 is provided with a displacement gauge 7 for detecting the amount of withdrawal, and the correction device 2
A load cell 8 is provided in the main body of the. And
Both sensor units 6 are connected to a control device 10 via a control circuit 9.
Is electrically connected to the controller 10.
And the load cell 8 is electrically connected via the dynamic strain gauge 11. The control device 10 is electrically connected to the drive device 4 and also electrically connected to the servo valve 13 interposed between the hydraulic pump 12 and the correction device 2.
Then, the control device 10 determines the roundness of the target tube based on the value detected by the sensor unit 6 and controls the driving of the correction device 2 and the drive device 4.

The operation of the above configuration will be described below. First,
While the straightening device 2 is positioned inside the target tube 1, the sensor 6 measures the inner diameter of the target tube 1 while the driving device 4 rotates the sensor part 6 and the straightening device 2 around the tube axis once. To do. Then, while moving the sensor unit 6 and the correction unit 2 in the tube axial direction by the drive unit 4, the control unit measures the inner diameters of the receiving portion 1a and the body portion 1b of the target pipe 1.
Record at 10. In addition, the control device 10 determines whether the circularity of the target tube 1 is good or bad based on the measured value, by comparing it with a standard value recorded in advance, and calculates the required correction position and the required correction amount. Then, the control device 10 controls the drive device 4 based on the calculated value,
The straightening device 2 is moved to a required straightening position, and the straightening device 2 presses the target tube 1 in the optical axis direction by a required amount to appropriately perform the elliptic straightening of the target tube 1. The procedure of this ellipse correction is shown in FIG. That is, the tendency of the load-deflection curve X when a test load is applied is expressed as a straight line PQ, and the permanent deflection corresponding to the required correction amount is set as δd = ▲ ▼, and a straight line 1 parallel to PQ is calculated from T. Ask. Next, the straightening device 2 applies a load corresponding to the main straightening to the target tube 1. That is, the load is stopped and unloaded at the point S where the load-deflection curve X ′ intersects with 1. Because of this, the permanent deflection δe = ▲
Occurs, and becomes δeδd at this time. Then, the measurement is performed again, and the above operation is repeated until it is determined that correction is unnecessary. Therefore, according to this embodiment, the inner diameters of the pipes can be measured corresponding to a plurality of types of target pipes 1 having different inner diameters, and the ellipse can be appropriately corrected. It should be noted that the sensor unit 6 can measure even if only one of them is provided, and the correction device 2 can press the target tube 1 even if it is configured by one cylinder unit 5.

EFFECTS OF THE INVENTION As described above, according to the present invention, the inner diameter of the target tube can be measured by the sensor unit, and the corrective device can appropriately correct the ellipse, which corresponds to a plurality of types of target tubes 1 having different inner diameters. be able to.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a correcting action. 1 ... Target tube, 2 ... Straightening device, 4 ... Driving device, 6 ...
... Sensor, 6a ... Optical axis, 10 ... Control device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 61-218904 (JP, A) JP-A 1-154820 (JP, A) Jitsuko 59-37301 (JP, Y2)

Claims (1)

[Claims] 1. A sensor section inserted into an inside of a target tube and having an optical axis projected in the radial direction of the tube to measure the inside diameter of the tube, and the target tube pressed from the inside in the optical axis direction of the sensor section. And a straightening device for expanding the same, a driving device for moving the sensor part and the straightening device along the tube axis direction, and rotating the sensor part and the straightening device around the tube axis center, and controlling the driving of the sensor part, the straightening device, and the driving device. And a control device,
The drive unit rotates the sensor unit around the pipe axis of the target pipe to measure the inner diameter of the pipe, and while the drive unit moves the sensor unit along the pipe axis direction, the pipe is moved at each position in the pipe axis direction. The inner diameter is measured and recorded, and the circularity of the target pipe is judged by comparing the standard value recorded in advance with the detected value, and the required correction position and the required correction amount are calculated, and based on the calculated values. A device for measuring the inner diameter of a pipe and correcting the ellipse of the target pipe by controlling a driving device and a correction device to correct the ellipse of the target pipe.