JPH0221131Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to an oil country tubular goods bend straightening device.

[Prior Art] Generally, in the case of oil country tubular goods, the ends of the pipes are subjected to upset processing to increase the thickness, and the thickened portions are threaded so that the upset pipes can be successively connected using couplings. There are cases. When manufacturing these upset tubes, in order to ensure the accuracy of the thread machining of the upset section and to ensure the connection between the upset tubes, bends that exceed a certain level are corrected and the amount of bend is controlled within a specified tolerance range. are doing.

[Problems to be solved by the invention] However, in the case of conventional oil country tubular bend straightening equipment, all operations such as detecting the amount of bend and straightening the bend are not automated, resulting in poor work efficiency and straightening accuracy. bad.

By the way, conventionally, as a bending straightening device for small diameter short bars different from oil country tubular goods, there have been methods as described in Japanese Patent Application Laid-open No. 51-31972, Japanese Patent Application Laid-Open No. 51-27860, and Japanese Utility Model Application No. 50-94238. A bend straightening device has been proposed. In these conventionally proposed bend straightening devices, both ends of the bar are held by a headstock and a tailstock, respectively, and the bar is held by a pressure holding means that moves in the axial direction of the bar. It is possible to correct bent parts. Therefore, in the case of the above-mentioned conventionally proposed bend straightening device, it is difficult to straighten a bar whose length exceeds the maximum set interval of the headstock or tailstock, such as a large-diameter long oil country pipe. is not possible. In addition, when applying the conventionally proposed bending straightening device to straightening the bending of oil country tubular goods, the maximum set interval of the headstock or tailstock is increased, and the pressure straightening means is applied to the headstock or tailstock. It is necessary to be able to move over a long range between the tables, which greatly increases the overall size of the device.

The object of the present invention is to enable automatic and highly accurate straightening of bent oil country tubular goods using a compact device.

[Means for Solving the Problems] The OCTG bend straightening device according to the present invention includes a conveyor roller that moves the OCTG in the axial direction and can set the OCTG to either a bend detection position or a correction position. and,
A rotary roller that rotates one end of the OCTG as a free end while supporting the outer circumferential surface of the other end or intermediate portion of the OCTG, and is arranged at multiple positions in the axial direction of the OCTG at the bend detection position. a displacement meter that detects the amount of bend at the corresponding measurement point of the OCTG, and a rotation device that detects the rotational angular position of the OCTG through a cone that is pressed against the free end of the OCTG and rotates integrally with the OCTG. An angle meter, a movement amount detector that detects the amount of axial movement of the OCTG using a touch roller in contact with the OCTG, a press ram for straightening the bend in the OCTG, and a touch roller in contact with the press ram to measure the amount of reduction of the press ram. a ram position detector that detects the
Simultaneously accepts the output of the displacement meter and the output of the rotation angle meter, and ascertains the maximum bending area in the circumferential and axial directions of the OCTG. By driving and controlling the rotating rollers, the maximum bending part of the OCTG is moved to the correcting position by the press ram,
and a controller that determines the amount of reduction of the press ram according to the bending amount of the maximum bending portion and drives and controls the reduction position of the press ram while receiving the output of the ram position detector, and corrects the oil country pipe by the press ram. and a pedestal for supporting the oil country tubular goods.

[Effect] According to the present invention, the following effects (A) to (C) are achieved.

(A) In the present invention, one end of the OCTG is a free end, and the other end or the outer circumferential surface of the intermediate part of the OCTG is supported by a rotating roller, and the OCTG is transported by a conveyor roller. It is possible to move between the bend detection position and the correction position.

Therefore, it is possible to reliably support a large-diameter long oil country pipe using a pipe support mechanism with a simple structure.

In addition, bends are detected by having one end, which is the free end, of an OCTG protrude from the rotating roller side, which reduces the effect of deflection due to its own weight, as in the case of supporting both ends of a long OCTG to detect bends. It is possible to accurately detect bends even in long pipes.

Further, even if the overall length of the oil country tubular goods changes in any way, the oil country country tubular goods can be reliably supported.

In addition, it is possible to immediately match the bend detection position and the correction position of the oil country tubular goods after the bend is detected.
Accurate correction work can be performed without any deviation between these two positions.

(B) A cone for detecting the rotational angular position of an OCTG is pressed against the free end of an OCTG.

Therefore, while a large-diameter long oil country pipe is supported by the above-mentioned rotating roller, its rotational angular position can be reliably measured by the above-mentioned cone.

In addition, even when the free end surface of an oil country tube rotates while being misaligned in the axial direction due to a deviation in parallelism between the axis of the rotating roller and the axis of the oil country tubular goods, the cone is pressed against the free end. In this way, it is possible to always follow the positional shift.

(C) The press ram is fixedly placed at a straightening position with respect to the OCTG without moving in the axial direction of the OCTG.

Therefore, since a large straightening force is applied to a long oil country pipe with a large diameter, the apparatus configuration can be made compact even when a large press ram is provided.

According to the above (A) to (C), according to the present invention, by moving the large-diameter long oil country tubular goods itself in the axial direction,
It becomes possible to automatically and highly accurately bend and straighten large-diameter long oil country tubular goods using a compact device without increasing the overall size of the device.

[Embodiment] FIG. 1 is a control system diagram showing an embodiment of the present invention.

The pipe 10 as an oil country tubular goods according to the present invention can be moved to a bend detection position and a correction position by means of conveyance rollers 11. At the bend detection position, the pipe 10 has one end as a free end, and the cone 12 is pressed against the end surface of the pipe 10.
Under the condition of being rotated while being supported by the outer peripheral surface of the other end or middle part by the rotating roller 13,
The probes of the displacement gauges 14, which are composed of movable transformers and the like arranged at a plurality of positions in the axial direction, can be brought into contact with the probes. Here, the rotation angle position of the pipe 10 is detected by a rotation angle meter 15 via a cone 12 that rotates integrally with the pipe 10, and is transmitted to a controller 16. Further, the amount of bending at each point of the pipe 10 measured by each of the displacement meters 14 is also transmitted to the controller 16. That is, the displacement meter 14 and the rotation angle meter 15 constitute a bend detection means, and the controller 16 grasps the amount of bend at each point in the circumferential direction at a plurality of positions in the axial direction of the pipe 10 based on the detection results of both of the above. , it is possible to grasp the maximum bending part of the pipe 10.

Further, the controller 16 controls the drive motor 11A of the conveyance roller 11 via the driver 17,
The maximum bending part of the pipe 10 can be moved to a straightening position by a press ram 18 as a straightening machine. Here, the amount of movement of the pipe 10 by the conveyance roller 11 is
9. Feedback is provided to the controller 16 via a movement amount detector 20 connected to the touch roller 19. Further, the controller 16 drives and controls the drive motor 13A of the rotary roller 13 via the driver 21, so that the convex portion at the maximum bending portion of the pipe 10 can be placed directly below the press ram 18 to face it. Here, the amount of rotation of the pipe 10 by the rotary roller 13 is fed back to the controller 16 via the cone 12 and the rotation angle meter 15.

Further, the controller 16 can drive and control the ram position of the press ram 18 via the driver 22. Here, the controller 16 calculates the reduction amount y determined by a predetermined linear function y=f(x) for the maximum bending amount x of the pipe 10, and the press ram 18 calculates the reduction amount y determined by a predetermined linear function y=f(x). It is possible to predict the amount of correction reduction applied to the area of maximum bending. Also,
The amount of reduction of the press ram 18 by the driver 22 is determined by the touch roller 23 in contact with the ram, the touch roller 23
Via a ram position detector 24 coupled to
Feedback is provided to the controller 16. In addition,
During the straightening reduction by the press ram 18, the pipe 10 can be supported by a pedestal 25 that rises from the standby position.

Next, the operation of the above embodiment will be explained.

The pipe 10 is carried to a bend detection position by the transport rollers 11, and is rotated by the rotating rollers 13 while one end surface of the pipe 10 is pressed against the cone 12. Under this rotating condition,
Each displacement gauge 14 is brought into contact with each position in the axial direction of the pipe 10, and the output of each displacement gauge 14 and the output of the rotation angle gauge 15 are transmitted to the controller 16. Based on the detection results of the displacement meter 14 and rotation angle meter 15, the controller 16 determines the amount of bend at each point in the circumferential direction at a plurality of positions in the axial direction of the pipe 10, and determines the maximum bend portion.

After the maximum bending portion of the pipe 10 is determined, the maximum bending portion of the pipe 10 is moved by the conveying rollers 11 to a position where the press ram 18 corrects the bending portion.
Further, the rotating roller 13 positions the convex portion of the pipe 10 at the maximum bending portion directly below the press ram 18.

After the maximum bending part of the pipe 10 is placed directly under the press ram 18, the pipe 10 is supported by the pedestal 25. Under this support condition, press ram 1
8 to lower the pipe 10 by the amount of straightening reduction predicted for the maximum amount of bending of the pipe 10.
After this reduction, the press ram 18 is raised, and the amount of bending of the pipe 10 is measured by the lower displacement gauge 14. If the bending amount of the pipe 10 is not completely corrected by this measurement, the controller 16 corrects the amount of correction reduction by the press ram 18, straightens the pipe 10 again by the press ram 18, and straightens the pipe 10. to be completely corrected.

According to the embodiment described above, it is possible to automatically measure the amount of bend in the pipe 10, apply an appropriate straightening pressure to a predetermined portion of the pipe 10 based on the measurement result, and correct the bend with high precision. Become.

Therefore, according to the above example, the following (A) to (C)
There is an effect.

(A) With one end of the pipe 10 set as a free end and the outer peripheral surface of the other end or intermediate portion of the pipe 10 supported by the rotating roller 13, the pipe 10 is moved by the conveying roller 11. It can be moved to the bend detection position and correction position.

Therefore, a large diameter long pipe 10 can be reliably supported using a support mechanism for a pipe 10 having a simple structure.

In addition, one end of the pipe 10, which is the free end, is made to protrude from the rotating roller 13 side to detect the bend, so that the bending is detected by supporting both ends of the long pipe 10. Correct bend detection can be performed even in the long pipe 10 by eliminating the influence.

Furthermore, even if the overall length of the pipes 10 changes in any way, the pipes 10 can be supported reliably.

Further, the bend detection position and the correction position of the pipe 10 can be made to correspond immediately after the bend is detected, and accurate correction work can be performed without any deviation between the two positions.

(B) The cone 12 for detecting the rotational angular position of the pipe 10 is pressed against the free end of the pipe 10.

Therefore, while the large-diameter long pipe 10 is supported by the above-mentioned rotating roller 13, its rotational angular position can be reliably measured by the above-mentioned cone 12.

Also, the axis of the rotating roller 13 and the pipe 1
Pipe 1 due to deviation in parallelism with the axis of
Even when the free end surface of the cone 12 rotates while being displaced in the tube axis direction, the cone 12 can always follow the displacement by being pressed against the free end.

(C) The press ram 18 is fixedly placed at a correcting position with respect to the pipe 10 without moving in the axial direction of the pipe 10.

Therefore, since a large straightening force is applied to the large diameter and long pipe 10, the apparatus configuration can be made compact even when a large press ram 18 is provided.

According to the above embodiments, by moving the large diameter long pipe 10 itself in the axial direction, without increasing the overall size of the device,
With a compact device, it is possible to straighten the bend of a large diameter and long pipe 10 automatically and with high precision.

[Effects of the invention] As described above, the OCTG bend straightening device according to the invention includes a conveyor roller that moves the OCTG in the axial direction and can set the OCTG to either the bend detection position or the correction position. a rotating roller that rotates one end of the OCTG as a free end while supporting the outer peripheral surface of the other end or intermediate portion of the OCTG; and a plurality of positions in the axial direction of the OCTG at bend detection positions. Detects the rotational angular position of the OCTG through a displacement meter that is placed at the position and detects the amount of bend at the corresponding measurement point of the OCTG, and a cone that is pressed against the free end of the OCTG and rotates integrally with the OCTG. a rotation angle meter that detects the amount of axial movement of the OCTG by a touch roller in contact with the OCTG, a press ram for straightening the bend in the OCTG, and a touch roller in contact with the press ram to detect the axial movement of the OCTG. Simultaneously accepts the output of a ram position detector that detects the amount of reduction, the output of a displacement meter, and the output of a rotation angle meter, and ascertains the maximum bending area in the circumferential direction and axial direction of oil country tubular goods, and also detects the output of the rotation angle meter and movement. By accepting the output of the quantity detector and controlling the drive of the conveyance roller and rotating roller, the maximum bending part of the oil country tubular goods is moved to the correction position by the press ram, and the press ram is rolled down according to the bending amount of the maximum bending part. a controller for driving and controlling the rolling down position of the press ram while receiving the output of the ram position detector; and a pedestal for supporting the oil country tubular goods when the oil country tubular goods are straightened and rolled down by the press ram. It was designed so that

Therefore, it becomes possible to straighten the bends in oil country tubular goods automatically and with high precision using a compact device.

[Brief explanation of the drawing]

FIG. 1 is a control system diagram showing an embodiment of the present invention. 10...pipe, 11...transport roller, 12...
... Cone, 13 ... Rotating roller, 14 ... Displacement meter, 15 ... Rotation angle meter, 16 ... Controller, 18
...Press Ram, 19...Tatsuchirola, 20...
...Movement amount detector, 23...Touchi roller, 24...
...Ram position detector, 25...cradle.

Claims (1)

[Scope of utility model registration request] a conveyance roller that moves the oil country tubular goods in the axial direction and allows the oil country tubular goods to be set at either a bend detection position or a correction position; and one end of the oil country country tubular goods as a free end;
A rotary roller that rotates while supporting the outer peripheral surface of the other end or middle part of the OCTG, and a roller that is arranged at multiple positions in the axial direction of the OCTG at the bend detection position, detects the amount of bend at the corresponding measurement point of the OCTG. A displacement meter that detects, a rotation angle meter that detects the rotation angle position of the OCTG through a cone that is pressed against the free end of the OCTG and rotates integrally with the OCTG, and a tatsuchi roller that contacts the OCTG. A movement amount detector that detects the amount of axial movement of the oil country tubular goods, a press ram that corrects the bending of the oil country tubular goods, a ram position detector that detects the reduction amount of the press ram by a touch roller in contact with the press ram, and a displacement meter. Simultaneously accepts the output of the rotation angle meter and the maximum bending area in the circumferential direction and axial direction of the oil country tubular goods, and also accepts the output of the rotation angle meter and the output of the travel amount detector to detect the conveyance roller and rotation roller. By controlling the drive, the maximum bending part of the oil country tubular goods is moved to the correction position by the press ram, and the amount of reduction of the press ram is determined according to the bending amount of the maximum bending part, while receiving the output of the ram position detector. A device for straightening the bending of oil country tubular goods, comprising: a controller that drives and controls the rolling position of a press ram; and a pedestal that supports the oil country tubular goods when the oil country tubular goods are straightened and rolled down by the press ram.