JPS6179530A - Control method of screwing length in coupling starter - Google Patents

Abstract

PURPOSE:To enable a feed of a coupling to be controlled in accordance with the information of a length measuring sensor, by equipping the length measuring sensor in a carry-in device and a pipe line clamping device further providing an arithmetic circuit and a control device in a screwing device. CONSTITUTION:A coupling starter provides a carry-in device 1, inserting device 10, screwing device 20 and a pipe line clamping device 30. A length measuring sensor 6, 33 is equipped to the carry-in device 1 and the pipe line clamping device 30. While the screwing device 20 provides an arithmetic circuit 27 and a control device 28. Accordingly, a feed distance of the screwing device 20 is calculated for a coupling B to a pipe A on the basis of information in their respective end part measured by said length measuring sensor 6, 33. If the feed reaches the distance, an instruction is output to the control device 28, stopping a DC motor 25 and an oil motor 22. In this way, the coupling B is screwed into the pipe A by the predetermined length.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method for controlling a coupling starter.

[Conventional technology]

The work of attaching threaded components such as couplings to screw-sealed pipes that generally have threads machined at their ends has been completely mechanized from the manual labor of the past, and in that sense it is becoming more streamlined.

Figure 2 is a configuration diagram of the mechanized coupling starter, where (1) is a carrying device, the handle is an insertion device, (201H screwing device, and (30) a 3-t pipeline clamp device. In the figure, the conveying device ( (not shown), the coupling BH1 hydraulic cylinder (4) placed on the mounting table (2) of the loading device (1) presses the pusher (3) that is moved, and the insertion device (10 ) is inserted into the chuck collet αυ of the coupling B, and the collet aυ is opened and gripped.Next, the insertion device (10) is rotated 900 times in the direction of the arrow around the central axis α2), and the chuck that grips the coupling B;
It faces the chuck Cυ of the screw spring screwing device (20). Next, the insertion device (10) is sent in the direction of the screwing device (201) by a hydraulic device (not shown), and the coupling B
chuck CD of the screwing device ω from the insertion device 00) to the
Move to. Next, when the screwing device (20+) is rotated 9 degrees in the direction of the arrow around the central axis (291), the coupling B faces the pipe A clamped by the pipeline clamp device □□□.

Next, when the screwing device (201 is a chuck (2D) holding the coupling B is rotated and sent in the direction of the pipe A, the coupling is inserted into the pipe A, and the threads of the coupling and the pipe are engaged. , when coupling B reaches the predetermined torque for pipe A, stop the rotation and feeding of chuck Cυ of screwing device It is screwed onto A.

[Problem that the invention seeks to solve]

By the way, with the recent increase in drilling under harsh conditions due to the development of offshore drilling and gas wells, it has become clear that the thread joint strength and airtightness are highly reliable, and that it can also be applied to screw-sealed pipes made of zero-alloy steel. Demand has arisen for it to be applicable to ultra-thick and double-sided pipes, and for this reason, the development of special screws has become active.

The special twist developed in this way increases the depth of the gas well,
In order to meet the demands of harsher use conditions, etc., dimensional accuracy has naturally become extremely high, and as a result, stricter tightening of couplings has been required.

From the above points, conventional coupling starters cannot meet new demands simply by mechanizing manual operation, and as thread specifications become more specialized and thread machining accuracy improves, coupling starters When installing the parts, it is an important condition that they mesh at a predetermined position and that the screwing is completed at a predetermined position. In this respect, there was a grudge that conventional devices could not satisfy the problem.

The object of the present invention is to solve the problems encountered when attaching a threaded part such as a coupling to a threaded part of a pipe, and to provide a coupling that automatically completes the threading of the coupling in a predetermined chamber of the pipe. It is an object of the present invention to provide a method for controlling screw length in a starter.

[Failure to resolve the issue]

In order to achieve the above object, the present invention provides a coupling starter with a length measurement sensor in the carrying-in device and the pipeline clamp device, and 1. Provides the screwing device with an arithmetic circuit and a control device, so that the length measurement sensor By controlling the feed distance of the coupling of the screwing device in dependence on the information, it is intended to control the length by which the coupling is screwed into the thread of the pipe.

[Effect]

When moving the coupling from the carry-in device to the insertion device, one end of the coupling is brought into contact with the face plate of the chuck collet of the insertion device, and the position of the opposite end is measured using a length sensor installed in the carry-in device. The information is then sent to the arithmetic circuit of the screwing device. The calculation circuit calculates the exact length of the compulsion ring from this value and the position of the face plate of the chuck collet of the known insertion device where the other end of the coupling comes into contact with the other end of the coupling.

Next, when the pipe is clamped by the pipeline clamp device, the position of the end of the threaded portion of the pipe is measured by a length measuring sensor provided in the clamp device, and the measured value is sent to the upper two calculation circuits.

Then the coupling, which was moved by the insertion device, is
The screwing device gripped by the chuck is rotated by an oil motor and sent in the direction of the pipe via the screw shaft by a DC motor, so that the coupling is screwed onto the threaded portion of the pipe. At this time, the above calculation circuit calculates the chuck feed based on the length of the coupling, the position of the end of the threaded part of the pipe, and the length of the coupling into the threaded part of the pipe, which is determined in advance from the length of the coupling. The distance is calculated, and when the chuck is sent that distance, a command is sent to the control device to automatically stop the rotation and feeding of the chuck. Thereafter, the screwing device loosens its grip on the coupling of the chuck collet, and when the chuck is retracted, the coupling is screwed into the threaded portion of the pipe by a predetermined length.

[Embodiments of the invention]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, in which (a) is a screwing device, (b) is a loading device, and (c) is a side view of a pipeline clamp device.

In the figure, the coupling placed on the loading table (2) of the loading device is driven by a pusher (3) driven by a hydraulic device (4).
and one end of it is pressed by the chuck α of the insertion device α0).
It moves in the direction of arrow 5 until it comes into contact with the face plate (11b) of the collet (11a) of υ. At this time, the length measurement sensor (
6) and sends the information to the arithmetic circuit @, the arithmetic circuit (2'I) calculates the value of the position of the end of the coupling B, and
The length l) of the coupling B is calculated from the value of the known position of the face plate (11b) that the end of the coupling of the collet chuck abuts.

Next, in an example of a pipeline clamp device, Fig. 1 (c
) As shown in the figure, the position of the end of the threaded portion of the clamped pipe A is measured by a length measuring sensor (36), and the measured value is sent to the arithmetic circuit (3).

On the other hand, the screwing device (2 (11) is a coupling B that has been moved from the insertion device, and its end is brought into contact with the face plate (21b) of the chuck collet (21a).
, and make it face the pipe A clamped by the pipeline clamp device (G). Next, the oil motor (2) is driven to rotate the spindle and the chuck t21 attached to its end via the gear □□□, and at the same time the DC motor (25) is driven to rotate the screw. Shaft (25a)
The main body (26) is sent in the direction of tube A via. At this time, the calculation circuit (3) calculates the length of the coupling (B) calculated based on the information sent from the length measurement sensor (6), and also calculates the threaded part of the pipe A sent from the length measurement sensor (66). From the information on the position of the end of A command is issued to stop the DC motor (2) and the oil motor (2) as well.

After this, the screw-in device (a) chuck cholera) (21
Loosen a) and move the main body back, then coupling B
is screwed into pipe A by a predetermined length.

Although the above-mentioned example is an example in which a coupling is screwed onto a threaded portion of a pipe, the present invention can be similarly applied to other screws and parts other than couplings.

〔Effect of the invention〕

The coupling starter loading device and the pipe line clamp device are equipped with a length measurement sensor, and the screwing device is equipped with an arithmetic circuit and a control device, and the information on the positions of the end of the coupling and the end of the pipe is calculated by the above-mentioned calculation. Based on this information, the calculation circuit calculates the distance that should be sent to the threaded part of the pipe of the coupling held in the chuck of the screwing device. Since the screwing length of the ring is controlled, the coupling can be screwed into the pipe at a predetermined position accurately and automatically.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, in which (a) is a screwing device, (b) is a loading device and an insertion device, and (c) is a side view of a pipeline clamp device. FIG. 2 is a block diagram of a conventional coupling starter. In the figure, (1) is a loading device, aO) is an insertion device, C is a screwing device, eO) is a pipeline clamp device, and (6). (3) is a length measurement sensor, (27) is an arithmetic circuit, @ is a control device, A is a pipe, and B is a coupling. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A coupling starter comprising a carrying-in device, an insertion device, a screwing device, and a pipeline clamping device, wherein the carrying-in device and the pipeline clamping device are equipped with a length measurement sensor, and the screwing device is equipped with an arithmetic circuit and a control device. The feeding distance of the screwing device is controlled based on the information on the positions of the coupling and each end of the pipe measured by the length measurement sensor, and the coupling is automatically placed at a predetermined position on the threaded part of the pipe. A method for controlling screw length in a coupling starter that is screwed together.