JPH06246350A - Stencil device for automatic marking thread part of steel tube - Google Patents

Abstract

PURPOSE:To automate marking of a triangle mark and coating of a belt like stencil for indicating position of the mark. CONSTITUTION:In a marking device 13 constituted with a turning roller 3 on which a steel tube 1 is rotated and mounted, a pulse generator 5 for circumferential positioning of the tube and a marking head positioning mechanism in the axial direction of tube and a vertical moving mechanism for the same, a photographic device 7 for the end surface of tube consisting of a camera 8 and a light 9, a photographic device 10 for the buttress thread part of tube consisting of a camera 11 and a light 12 and an image processing device 14 by which silhouette signals from both of devices 7 and 10 are processed are also provided. Further, an arithmetic unit 18 having a positioning mechanism in the axial direction of tube and for vertical moving and by which the marking position and rotating angle are calculated based on signals from a belt like stencil coating device 17 traveling in the axial direction of tube and the image processing device and the diameter of tube, a driving motor 4 for the turning roller is controlled based on the result of calculation and positioning mechanisms in the axial direction of tube and vertical movement for the marking device, a marking head vertical moving mechanism and belt like stencil coating device are controlled is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engraving of a triangle mark for confirming a coupling tightening completion position on a threaded portion of a steel pipe such as a buttress screw of an oil country tubular good and a belt-shaped stencil device for displaying the position of the triangle mark.

[0002]

2. Description of the Related Art Recently, oil wells have become deeper and deeper, and as a threaded joint for steel pipes for oil wells, the joint strength is high, the airtightness is strong, and even if it is repeatedly used, it bites on the threaded portion,
It is required to have good workability in the field of oil wells because it is difficult for damage such as bruise to occur. Buttress screws for casings of oil country tubular goods are API (American Petroleum Institute) standard screws,
It is a standard screw for oil country tubular goods, and has the features of trapezoidal shape, high joint strength, and efficient stabbing work.

[0003] In the oil country tubular goods, a buttress threaded portion after thread cutting is generally coated with a triangle mark indicating a coupling tightening completion position and a band-shaped white stencil for displaying the position of the triangle mark. This triangle mark has a triangular shape,
It is a standard that controls the tightening position so that the end surface of the coupling is inside this triangle. The triangle mark is engraved on the buttress thread portion of the oil country tubular good, as shown in FIG. 6, so that the bottom of the triangle mark 53 is located at the tightening completion position of the coupling 52 connecting the oil country tubular goods 51. This triangle mark 53
As shown in Table 1, the position of the bottom of the triangle has a distance A from the pipe end determined according to the outer diameter of the oil well pipe 51, and the bottom of the triangle mark 53, which is the reference line, must remain as a marking mark. I have to. Therefore, the position of the bottom side of the triangle mark 53 needs to be marked on the thread portion of the buttress thread portion. Further, the strip-shaped white stencil 54 for displaying the position of the triangle mark is applied with a predetermined width and length starting from the apex of the triangle mark 53.

[0004]

[Table 1]

Conventionally, in engraving a triangle mark, an oil well pipe is placed on a rotating device, an operator visually positions the oil well pipe while manually rotating the oil well pipe, and a triangle is struck with a one-hand hammer. The mark was stamped. Similarly, in the work for applying the strip-shaped stencil for displaying the position of the triangle mark, the operator visually confirmed the apex of the triangle mark and applied the stencil with spray paint using a dedicated marking plate. Therefore, the work of engraving the triangle mark and the work of applying the belt-shaped stencil has a problem that much work and time are required, and the work efficiency cannot be improved.

The triangle mark automatic marking device includes a turning roller for rotatably mounting a steel pipe, an end face aligning mechanism for the steel pipe mounted on the turning roller, a pipe axial positioning mechanism for the marking head, and a marking head. In the apparatus, a pulse generator for circumferentially positioning a steel pipe on a turning roller, an image pickup device for a buttress screw portion of the steel pipe, a signal processing circuit for binarizing a signal from the image pickup device, and a buttress based on the binarization pattern A device provided with a triangle mark embossing position detection circuit for identifying unevenness of a screw and electrically detecting a triangle mark embossing position, and a mechanism for controlling a turning roller drive motor based on the triangle mark embossing position detection signal. (Japanese Patent Laid-Open No. 64-34516), a steel pipe is rotatably mounted. In a marking device consisting of a turning roller, an end surface alignment mechanism for a steel pipe placed on the turning roller, a pipe axial positioning mechanism of a marking head, and a marking head, a pulse generator for circumferential positioning of the steel pipe on the turning roller, A sensor that measures the distance to the thread surface by scanning the buttress thread portion in the pipe axis direction, a signal processing circuit that binarizes those signals, and a triangle mark that identifies irregularities of the buttress thread based on the binarization pattern. An apparatus having a triangle mark engraving position detection circuit for electrically detecting the engraving position and having a mechanism for controlling the turning roller drive motor based on the triangle mark engraving position detection signal (Japanese Patent Laid-Open No. 1-205827). ) Etc. have been proposed.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The automatic marking device disclosed in Japanese Patent No. 516 is an optical means for clearly binarizing a glossy screw bottom portion and a screw thread portion of a black skin by binarization, and is disclosed in Japanese Patent Laid-Open No. 1-205827. The automatic marking device is a device that detects unevenness of a buttress screw with a distance sensor and automatically marks a triangle mark at a predetermined position. However, JP-A-64
In all of the automatic marking devices disclosed in JP-A-34516 and JP-A-1-205827, since the pipe end positioning method is a stopper, the stopper surface may be worn over time. On the other hand, the convex width of the buttress screw is approximately 2.5 mm.
The width is narrow, and if the stopper surface for positioning the pipe end is worn, it is difficult to secure the accuracy of the triangle mark engraving position. In addition, after the unevenness of the buttress screw is detected, the steel pipe is rotated in order to perform the marking of the triangle mark, but the pipe end position may shift during the rotation of the steel pipe. This causes the triangle mark engraving point to deviate from the target engraving point. Further, the automatic marking devices disclosed in the above-mentioned JP-A-64-34516 and JP-A-1-205827 have a strip-shaped stencil coating function for displaying a triangle mark engraving position, which is a series of operations for marking a triangle mark. Because I don't have
It has not reached full automation.

An object of the present invention is to provide an automatic marking stencil device for a threaded portion of a steel pipe in which the marking work of the triangle mark and the coating work of the band-shaped stencil for displaying the position of the triangle mark are fully automated.

[0009]

[Means for Solving the Problems] The present inventors have conducted various test studies in order to achieve the above object. As a result, the unevenness detection of the buttress screw and the pipe end positioning method of the automatic marking device of the steel pipe screw part, by detecting the unevenness of the pipe end position and the buttress screw by the silhouette image by the backlight, the pipe end position of the steel pipe is determined. In addition to being able to detect accurately, it is possible to correct the displacement of the pipe end position during rotation of the steel pipe, and by combining an automatic stencil coating device, it is possible to fully automate the work of marking the triangle mark and the work of applying the band-shaped stencil for displaying the triangle mark position. And reached the present invention.

That is, the present invention provides a marking device comprising a turning roller for rotatably mounting a steel pipe, a pulse generator for circumferentially positioning the steel pipe on the turning roller, a pipe axial positioning mechanism for the marking head, and a marking head lifting mechanism. A steel pipe end face photographing device on a turning roller consisting of a camera and lighting, a screw portion photographing device of a buttress screw of a steel pipe consisting of a camera and lighting, and an image processing device for processing a silhouette signal from the steel pipe end face photographing device and the screw portion photographing device, The marking position and the rotation angle are calculated based on the signal from the image processing device and the pipe diameter, the drive motor of the turning roller is controlled based on the calculation result, and the pipe axis direction positioning mechanism and the marking head lifting mechanism of the marking device are calculated. It is an automatic marking device for a threaded portion of a steel pipe, which comprises an arithmetic and control unit for controlling the.

Further, in a marking device comprising a turning roller for rotatably mounting the steel pipe, a pulse generator for circumferentially positioning the steel pipe on the turning roller, a pipe axis direction positioning mechanism of the marking head and a marking head lifting mechanism, a camera and an illumination are provided. Steel pipe end face imaging device, consisting of a turning roller,
An image processing device for processing a silhouette signal from a steel pipe end face image capturing device and a screw portion image capturing device, a screw portion image capturing device for a steel pipe buttress screw including a camera and illumination, and a pipe axis direction and a vertical axis positioning mechanism. The belt-shaped stencil coating device that travels in the direction, the marking position and the rotation angle are calculated based on the signal and the pipe diameter from the image processing device, and the driving motor of the turning roller is controlled based on the calculation result. An automatic marking stencil device for a threaded portion of a steel pipe, which comprises a pipe axis direction positioning mechanism, a marking head elevating mechanism, and an arithmetic and control unit for controlling the pipe axis direction and the elevating and lowering mechanism of a strip-shaped stencil coating device.

[0012]

The automatic marking device according to the present invention is different from the conventional marking device in that the image processing device for processing silhouette signals from the steel pipe end surface photographing device and the screw portion photographing device of the buttress screw, the pipe axis direction positioning mechanism and the stencil coating head. A belt-shaped stencil coating device having an elevating mechanism and running in the pipe axis direction, and a marking position and a rotation angle are calculated based on a signal from the image processing device and a pipe diameter, and a turning roller drive motor is calculated based on the calculation result. In addition to controlling the pipe axis direction positioning mechanism of the marking head, the marking head elevating mechanism, and the pipe axis direction positioning mechanism of the band-shaped stencil coating device and the elevating positioning mechanism, the arithmetic control device is provided with By inputting the outer diameter of A, the distance A between the pipe end and the bottom of the triangle mark shown in Table 1 above. It is selected. Further, the arithmetic and control unit determines the pipe end position based on the signal input from the image processing device which processes the silhouette signal from the steel pipe end face photographing device, and sets the marking device at the position of the distance A from the pipe end. , A thread of the buttress screw closest to the reference line is detected based on a signal input from an image processing device that processes a silhouette signal from the buttress screw portion photographing device whose reference line is the distance A from the pipe end, The width of the detected screw thread is calculated to obtain the bisector thereof, and the distance X from the pipe end to the reference line of the distance A is calculated.

Since the screw pitch of the buttress screw is constant, the arithmetic and control unit matches the center line of the screw thread, which is closest to the reference line of the distance A from the pipe end, based on the calculated distance X. The tube rotation angle is calculated, the tube rotation distance is calculated based on this rotation angle and the tube outer diameter, and the turning roller drive motor is controlled. Further, the arithmetic and control unit corrects the deviation amount of the pipe end position based on the signal input from the image processing device that processes the silhouette signal from the photographing device Y even during the rotation of the pipe. Then, when the positioning of the target steel pipe is completed, the arithmetic and control unit lowers the marking head standing by at the marking position of the triangle mark to stamp and mark the triangle mark.

Further, in addition to the above, the automatic marking stencil device of the present invention has a pipe axis direction positioning mechanism and a stencil coating head elevating mechanism, and is provided with a strip-shaped stencil coating device which runs in the pipe axis direction, and an arithmetic control device. Since a mechanism for controlling the pipe axial direction positioning mechanism and the lifting positioning mechanism of the strip-shaped stencil coating device was added to the above, the triangle mark size is defined as an equilateral triangle with a side of 11 mm, so the distance from the pipe end depends on the pipe outer diameter. The position of the apex of the triangle mark is calculated based on A, and the pipe axis direction and the vertical positioning mechanism of the band-shaped stencil coating device for the marking position of the triangle mark are controlled, and the band-shaped stencil is coated starting from the apex of the triangle mark. It can be carried out.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. FIG. 1 is a control system diagram of an automatic marking stencil device for a steel pipe thread portion of the present invention, FIG. 2 is a side view showing the shape of a buttress screw, and FIG. 3 shows a state in which a marking head is set at a position of a distance A from the pipe end. 4 is a side view shown in FIG. 4, FIG. 4 is an explanatory view of a projection and depression silhouette of a buttress screw and a pipe rotation distance calculation, and FIG. 5 is a schematic explanatory view of an automatic marking device and a stencil device of a replacement carriage system. In FIG. 1, 1 is a steel pipe, 2 is a turning roller 3 for rotatably mounting the steel pipe 1, a drive motor 4 with a braking mechanism for driving the turning roller 3, and a pulse generator for detecting the rotation of the steel pipe 1 by a pressing mechanism against the steel pipe 1. 5 is a tube rotating device. 6 is steel pipe 1
A stopper 7 for aligning the pipe ends is a pipe end photographing device including a camera 8 and an illumination 9. The stopper 6 is installed on both sides with the steel pipe 1 interposed between the stopper 6 and the steel pipe 1. 1
Reference numeral 0 denotes a screw portion photographing device for the buttress screw of the steel pipe 1 including the camera 11 and the illumination 12. The camera 11 and the illumination 12 are installed on both sides of the steel pipe 1 with the stamping marking machine 13 interposed therebetween. As the cameras 7 and 11, one-dimensional CCD cameras (the field of view is about 10 mm for two screw pitches and the resolution is 0.05 mm and 200 bits) are used.
Reference numeral 14 denotes an image processing apparatus including a controller 15 and an image display monitor 16 which process a pipe end silhouette signal input from the camera 8 and a screw shape silhouette signal from the camera 11.

The stamping type marking machine 13 has a pipe axis direction positioning mechanism and a vertical positioning mechanism, which are not shown. Numeral 17 is a belt-shaped stencil coating device which has a pipe axis direction positioning mechanism and a vertical movement positioning mechanism for the steel pipe 1 similarly to the stamping type marking machine 13 and is movable in the pipe axis direction. Reference numeral 18 denotes an arithmetic and control unit, which is based on the pipe diameter inputted from the keyboard 19 and is stored in advance from the relationship between the pipe end shown in Table 1 and the distance A between the triangle mark bottom and the corresponding pipe end and triangle mark. Select a distance A to the bottom.
Further, the arithmetic and control unit 18 detects the pipe end position based on the pipe end silhouette signal input from the camera 8 to the controller 15, controls the drive unit 20 of the stamping type marking machine 13, and is shown in FIG. As described above, the positioning mechanism of the stamping type marking machine 13 is operated so that the bottom of the triangle mark of the stamping type marking machine 13 is located at the position of the distance A from the pipe end of the steel pipe 1. Further, the arithmetic and control unit 18 uses the steel pipe 1 based on the thread shape silhouette signal of the screw portion whose reference line a is the distance A from the pipe end of the steel pipe 1 which is photographed by the camera 11 and input to the controller 15. The thread 21 closest to the reference line a at the distance A from the pipe end is determined, the width of the determined thread 21 is calculated to obtain the bisector (the center of the thread 21), and the reference line a The distance X between the center line b of the thread 21 and the center of the thread 21 is calculated. Furthermore, the arithmetic and control unit 18 calculates the pipe rotation angle θ at which the center line b of the thread 21 closest to the reference line a matches the reference line a based on the calculated distance X, and the pipe rotation angle θ is calculated. The rotation distance L of the steel pipe 1 is calculated based on θ and the pipe outer diameter D. In this case, the arithmetic and control unit 18 detects and corrects the pipe end position displacement amount due to rotation based on the pipe end position silhouette signal input from the camera 8 to the controller 15.

The arithmetic and control unit 18 includes the turning roller 3
When the rotation distance L _{1 of the} steel pipe 1 input from the pulse generator 5 becomes equal to the calculated rotation distance L, the drive motor 4 with a braking mechanism for driving the motor 4 is stopped to position the steel pipe 1. . Next, when the positioning of the steel pipe 1 is completed, the arithmetic and control unit 18 controls the drive unit 20 of the embossing type marking machine 13 waiting at the engraving position of the triangle mark according to the image processing information from the controller 15, The marking head of the marking machine 13 is moved down so that the bottom of the triangle mark is located at the center b of the thread 21 of the steel pipe 1 in the width direction, for stamping and marking.
Further, when the marking and marking of the triangle mark are completed, the arithmetic and control unit 18 sets the distance A from the pipe end and the side 1
The triangle mark apex T is calculated based on the triangle mark size of a regular triangle of 1 mm, and the belt-shaped stencil coating device 17 for displaying the marking position of the triangle mark 17
Is controlled to move the belt-shaped stencil coating device 17 to the belt-shaped stencil coating position, and the belt-shaped stencil coating is performed starting from the apex T of the triangle mark. Reference numeral 23 is a CRT screen.

With the above configuration, when the outer diameter of the steel pipe 1, for example, 5 inches is input from the keyboard 19 to the arithmetic and control unit 18, the arithmetic and control unit 18 stores in advance based on the input pipe diameter of 5 inches. From the distance A between the pipe end and the bottom of the triangle mark shown in Table 1 above, select the distance 103.2 mm between the pipe end having the corresponding pipe diameter of 5 inches and the bottom of the triangle mark. Further, the arithmetic and control unit 18 detects the pipe end position from the pipe end silhouette signal input from the camera 8 to the controller 15,
The drive unit 20 of the stamping type marking machine 13 is controlled so that the stamping type marking machine 13 is moved 103.2 m from the pipe end of the steel pipe 1 as shown in FIG.
Set so that the bottom of the triangle mark is located at the position of m. Further, as shown in FIG. 4, the arithmetic and control unit 18 has a thread shape silhouette of a thread portion whose reference line a is a distance 103.2 mm from the pipe end of the steel pipe 1 photographed by the camera 11 and input to the controller 15. Based on the signal, the thread 21 closest to the reference line a at a distance of 103.2 mm from the tube end of the steel tube 1 is determined, and the determined thread 21
Is calculated to obtain the center line b of the thread of the bisector, and the distance X between the reference line a and the center line b at a distance of 103.2 mm from the pipe end is calculated. As shown in FIG. 2, since the screw pitch P of the buttress screw is constant, the arithmetic and control unit 18 determines the screw thread located in the immediate vicinity of the reference line a at a distance of 103.2 mm from the pipe end based on the calculated distance X. The pipe rotation angle θ at which the center line b of 21 matches the reference line a is calculated, and the rotation distance L of the steel pipe 1 is calculated based on the pipe rotation angle θ and the pipe outer diameter D. In this case, the arithmetic and control unit 18 detects and corrects the pipe end position displacement amount due to rotation based on the pipe end silhouette signal input from the camera 8 to the controller 15.

The arithmetic and control unit 18 determines the rotation distance L of the steel pipe 1.
When the calculation of is completed, the drive motor 4 is started and the rotation distance L calculated from the number of pulses p input from the pulse generator 5 is calculated.
_{When 1} becomes equal to the rotation distance L, the drive motor 4 is stopped,
The positioning of the steel pipe 1 is completed. Then, the arithmetic and control unit 18
When the positioning of the steel pipe 1 is completed, the driving unit 20 is controlled to lower the marking head of the stamping type marking machine 13,
The triangle mark is engraved and engraved with the bottom side positioned on the center line b of the screw thread 21. Further, the arithmetic and control unit 18
When the triangle mark is stamped and stamped,
The triangle mark apex T is calculated based on the distance A from the pipe end and the triangle mark dimension of an equilateral triangle of 11 mm on a side, and controls the drive unit 22 of the band-shaped stencil coating device 17 for displaying the marking position of the triangle mark,
The belt-shaped stencil coating device 17 is moved in the tube axis direction and moved to the triangle mark apex T, and the belt-shaped stencil coating is performed starting from the apex T of the triangle mark.

As shown in FIG. 6, since the marking point of the triangle mark 53 and the coating start point of the band-shaped stencil 54 interfere structurally, as shown in FIG. 5, the marking machine 13 and the band-shaped stencil coating device 17 are provided. And a horizontal slide type exchange bogie system, and after engraving the triangle mark with the engraving type marking machine 13, the exchanging bogie 25 by the drive mechanism 24.
It is also possible to adopt a method in which the belt-shaped stencil coating device 17 is used to apply a belt-shaped stencil having a predetermined width and length by horizontally sliding.

[0021]

As described above, according to the present invention,
It is possible to completely automate the engraving of the triangle mark for confirming the coupling tightening completion position on the steel pipe threaded portion and the application of the band-shaped stencil for displaying the position of the triangle mark, and the work efficiency can be greatly improved.

[Brief description of drawings]

FIG. 1 is a control system diagram of an automatic marking / stencil device for a threaded portion of a steel pipe of the present invention.

FIG. 2 is a side view showing the shape of a buttress screw.

FIG. 3 is a side view showing a state in which the marking head is set at a position of distance A from the tube end.

FIG. 4 is an explanatory diagram of a silhouette of a buttress screw and a pipe rotation distance.

FIG. 5 is a schematic explanatory diagram of an exchange cart type automatic marking device and a stencil device.

FIG. 6 is an explanatory diagram of an embossing position of a triangle mark.

[Explanation of symbols]

 1 Steel Pipe 2 Pipe Rotating Device 3 Turning Roller 4 Drive Motor 5 Pulse Generator 6 Stopper 7 Pipe End Photographer 8, 11 Camera 9, 12 Illumination 10 Screw Part Photographer 13 Engraving Marker 14 Image Processor 15 Controller 16 Image Display monitor 17 Band-shaped stencil coating device 18 Arithmetic control device 19 Keyboard 20, 22 Drive part 21 Screw thread 23 CRT screen 24 Drive mechanism 25 Exchange cart 51 Oil well pipe 52 Coupling 53 Triangle mark 54 Band-shaped stencil

Claims (2)

[Claims] 1. A turning roller for rotatably mounting a steel pipe,
A marking device comprising a pulse generator for circumferentially positioning a steel pipe on a turning roller, a pipe axis positioning mechanism for a marking head, and a marking head lifting mechanism. Image processing apparatus for processing a silhouette signal from a buttress screw of a steel pipe and a steel pipe end face imaging apparatus and a screw section imaging apparatus, and a marking position and a rotation angle based on a signal from the image processing apparatus and a pipe diameter And an operating control device for controlling the turning roller drive motor based on the operation result, and an automatic control device for a screw part of the steel pipe, which comprises a pipe axis direction positioning mechanism of the marking device and an arithmetic control device for controlling the marking head elevating mechanism. 2. A turning roller for rotatably mounting a steel pipe,
A marking device comprising a pulse generator for circumferentially positioning a steel pipe on a turning roller, a pipe axis positioning mechanism for a marking head, and a marking head lifting mechanism. A steel pipe buttress screw thread imaging device and a steel pipe end face imaging device and an image processing device that processes silhouette signals from the screw imaging device, and a pipe axis direction and vertical positioning mechanism that travels in the pipe axis direction. The belt-shaped stencil applicator, which calculates the marking position and the rotation angle based on the signal and the pipe diameter from the image processing device, and controls the drive motor of the turning roller based on the calculation result, and the pipe axis direction of the marking device. Positioning mechanism, engraving head lifting mechanism, and pipe axis direction and lifting position of band-shaped stencil coating device Automatic marking stencil device steel threaded portion consisting of an arithmetic control unit for controlling the mechanism.