JPH0753294B2 - Device for measuring pipe outer diameter and straightening - Google Patents

Description

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

2. Description of the Related Art Conventionally, cast pipes have variations in roundness and straightness. For this reason, devices for measuring pipe gauges are provided separately according to the nominal diameter of each pipe. Was there.

Problems to be Solved by the Invention According to the above-described conventional configuration, there is a problem that equipment cost increases because a 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 outer diameter of a pipe corresponding to a pipe of any diameter and for easily correcting the outer diameter of the pipe and for correcting the bend. The purpose is to provide.

Means for Solving the Problems In order to solve the above problems, the present invention provides a rotating device for supporting a target tube in a horizontal direction and rotating the tube about an axis of the tube, and a tube positioned above the tube. A straightening device that is movably provided in the axial direction and presses the pipe downward, a plurality of pipe outer diameter measuring devices arranged along the pipe axial direction, and a pipe outer diameter measuring device that is provided horizontally. And an optical axis in a direction orthogonal to the tube axis is formed, and a pair of upper and lower sensor portions are separated from each other in the vertical direction so that the optical axis located above corresponds to the upper edge of the tube. A sensor unit driving device that makes the optical axis located below correspond to the lower end edge of the tube, a scale unit that measures the distance between both sensor units, and controls the drive of the rotating device and the correction device, and also the sensor unit and the scale unit. Of the target tube based on the value detected by A control device for determining circularity and straightness is provided.

Operation In the above-described configuration, the sensor unit drive device appropriately separates the sensor units, and the optical axes of the sensor units are made to correspond to the upper end edge and the lower end edge of the target tube arranged on the rotating device. Therefore, the pipe outer diameter is measured corresponding to a plurality of types of pipes having different outer diameters. Then, the control device determines the roundness and straightness of the target pipe from the measured values. Then, based on the correction required position and the correction required amount calculated by the control device, drive the rotation device and the correction device,
The target tube is appropriately straightened by pressing by the straightening device.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, the target tube 1 arranged in the horizontal direction.
A plurality of pipe outer diameter measuring devices 2 are provided along the pipe axis direction. The pipe outer diameter measuring device 2 includes a pair of support shafts 3 and 4 which are erected at left and right positions via a pipe shaft center, and one support shaft 3
A pair of upper and lower laser projecting portions that are screwed together with the laser projecting portion 5 and a pair of upper and lower laser projecting portions that are screwed onto the other support shaft 4
And a drive device 7 interlockingly connected to both support shafts 3 and 4. A sensor section 8 is formed by the laser projecting section 5 and the laser receiving section 6, and the optical axis 8a of the sensor section 8 is horizontal and is formed in a direction orthogonal to the tube axis. Also, the support shaft 3,4
The sensor unit drive unit 9 is formed by the drive unit 7 and the drive unit 7.
Both sensor parts 8 are separated from each other so that the optical axis 8a located above corresponds to the upper end edge of the target tube 1 and the optical axis 8b located below corresponds to the lower end edge of the target tube 1. Has been done. The sensor unit driving device 9 is provided on the concave frame 10, and the linear scale 11 that moves along the vertical side 10a of the concave frame 10 is attached to the laser projecting unit 5 of the upper sensor unit 8. Further, the linear scale 11 is adapted to measure the distance between both sensor units 8. The hydraulic ram is located above the target pipe 1.
12 are arranged, and the hydraulic ram 12 is a truck that travels while being guided by a guide rail 13 provided along the pipe axis direction.
Backed by 14. A pair of rotating devices 15 that support the target tube 1 below and rotate the tube about the tube axis are arranged at the front and rear in the tube axis direction. Both sensor units 8 are electrically connected to the control device 16, and the control device 16 includes a displacement meter 17 for detecting the displacement of the hydraulic ram 12 and a load cell 18 for detecting the load of the hydraulic ram 12. It is electrically connected via a dynamic strain gauge 19. Further, the control device 16 includes
The sensor unit driving device 9 is electrically connected via a drive circuit 20, and the linear scale 11 is electrically connected via a counter circuit 21. Further, the control device 16 includes
A servo valve 24, which is interposed in the oil supply pipe 23 of the hydraulic pump 22 that operates the hydraulic ram 12, is electrically connected. A monitor 26, a disk drive 27, and a printer 28 are connected to the control device 16, and the disk drive 27 stores data and the printer 28 outputs the result.

The operation of the above configuration will be described below. First,
The target tube 1 is placed on the rotating device 15, both sensor parts 8 are separated by the sensor part driving device 9, and the optical axis positioned above
8a is made to correspond to the upper end edge of the target tube 1, and the optical axis 8b located below is made to correspond to the lower end edge of the target tube 1. At this time, as shown in FIG. 3, the laser beam projected from the laser projecting unit 5 is projected in a vertical direction with a predetermined width, and a part of the laser beam is blocked by the target tube 1 to the laser receiving unit 6. To reach. Then, the sensor position X ₀ , which is the distance between both sensor units 8 in this state, is detected by the linear scale 11 and the counter circuit 21, and the value is sent to the control device 16 and stored therein. Next, while rotating the target tube 1 by the rotating device 15, the upper sensor output X ₁ received by the laser light receiving portion 6 located above and the lower sensor output X ₁ received by the laser light receiving portion 6 located below. ₂ and ₂ are sent to the controller 16. Then, the calculation shown below is calculated in the control device 16.

That is, the outer diameter d = X ₀ −X ₁ −X _{2 is used} as a value for judging the circularity. The ellipse R = d _max −d _min is calculated. Further, the formula for obtaining the curve amount (BEND) B as the value for determining the straightness is, y = d / 2 + x 2 = (x 0 -x 1 -x 2) / 2 + x 2 = x 0/2 + (x 2 - x ₁ ) / 2 If x ₂ −x ₁ = Z, then B = (y _max −y _min ) / 2 = (Z _max −Z _min ) / 4. At this time, the elliptical position and the curved position in the circumferential direction are also calculated. The measurement is performed during one rotation of the target tube 1. Incidentally, FIG. 4 shows an example of the measurement processing result of the outer diameter d. In this figure, when ANGLE is 278 (deg), the outer diameter d is the maximum outer diameter d.
_{The maximum} is 169.24 (mm), and when ANGLE is 194 (deg), the outer diameter d is 168.51 (mm), which is the minimum outer diameter d _min . Then, the circularity and the straightness are determined from the calculated average diameter, ellipse R, and bending amount B, and the quality of the product is determined, and the necessity of correction is determined for the non-defective product. Then, when it is determined that correction is necessary, based on the correction command issued from the control device 16, the rotation device
15 is driven, and the target tube 1 is arranged so that the position where the bending amount is maximum is directed in the vertical direction. Then, the hydraulic ram 12 is moved by the traveling of the carriage 14 so as to correspond to the position for correction. Next, the hydraulic ram 12 is operated to apply a test load to the target pipe 1. At this time, the relationship between the load and the deflection measured by the displacement gauge 17, the load cell 18, and the dynamic strain gauge 19 is as shown in FIG. That is, the tendency of the load-deflection curve X is represented as the straight line PQ. Then, a straight line 1 parallel to PQ is obtained from T by setting the permanent deflection corresponding to the required correction amount as δd = ▲ ▼. Next, a load commensurate with the main straightening is applied to the target tube 1 by the hydraulic ram 12. That is, the load is stopped and unloaded at the point S where the load-deflection curve X ′ intersects with 1. As a result, a permanent deflection δe = OT ₁ occurs,
At this time, δeδd. Then, measure again,
The above operation is repeated until it is determined that correction is unnecessary. Incidentally, FIG. 6 is a flow chart of the above-mentioned operation.
Therefore, according to this embodiment, a plurality of types of target tubes 1
Corresponding to the above, it is possible to measure the outer diameter of the pipe and correct it based on the measurement result.

EFFECTS OF THE INVENTION As described above, according to the present invention, by appropriately separating the sensor portions, it is possible to measure the pipe outer diameter corresponding to a plurality of types of target pipes having different outer diameters. And
The circularity and straightness of the target tube can be judged by the control device from the measured values, and can be corrected by pressing with the correction device.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, FIG. 3 is a diagram showing a measurement state, and FIG. 4 is a measurement processing result. FIG. 5 and FIG. 5 are views showing the correcting action, and FIG. 6 is a flow chart showing the procedure of one embodiment of the present invention. 1 ... Target tube, 2 ... Tube outer diameter measuring device, 5 ... Laser projecting part, 6 ... Laser receiving part, 8 ... Sensor part, 9 ... Sensor part driving device, 11 ... Linear scale, 12 …… hydraulic ram, 15 …… rotating device, 16 …… control device.

Continuation of the front page (56) References JP-A-61-108425 (JP, A) JP-A-61-149810 (JP, A) Actually opened 59-71108 (JP, U) JP-B-60-32531 (JP , B2)

Claims (1)

[Claims] 1. A rotating device for supporting a target pipe in a horizontal direction and rotating the pipe about an axis of the pipe, and a rotator located above the pipe so as to be movable in the direction of the pipe axis, and presses the pipe downward. A straightening device, a plurality of pipe outer diameter measuring devices arranged along the pipe axis direction, and a pipe outer diameter measuring device that is provided in the pipe outer diameter measuring device and forms an optical axis that is horizontal and is orthogonal to the pipe axis center. And a sensor unit driving device in which the upper and lower optical axes correspond to the upper end edge of the tube and the lower optical axis corresponds to the lower end edge of the tube. And the scale unit that measures the distance between both sensor units and the drive of the rotating device and the straightening device, and the circularity and straightness of the target pipe based on the values detected by the sensor unit and scale unit. Is equipped with a control device for determining Apparatus for performing outer diameter measurement and straightening to.