JPH0553575B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a coupling starter for attaching a threaded part such as a coupling to a threaded pipe.

[Prior art]

When shipping threaded pipes such as oil country tubular goods and gas pipes, a coupling starter is used to attach coupling rings (including thread protectors) to the threads machined at the end of the pipe body. Installation is in progress.

5 to 7 are diagrams of a conventional coupling starter disclosed in Japanese Patent Publication No. 56-42415. However, in the same figure, the illustration of the grease application device shown in the above-mentioned publication is omitted.

In the figure, 61 is the main body of the coupling starter, 62 is a frame fixed on the base, 63 is an upper frame, 64 is a cylinder for raising and lowering the frame,
65 is a guide, 66 is a running groove provided in the frame 63 that runs in the tube axis direction, 67 is a mounting base equipped with wheels 68 that engage with the running groove 66, and 70 is a mounting base 67
A cylinder 72 is fixed to the upper surface of the mounting base 67 and suspends a floating base 74 via a spring 73, and 75 is a floating base. A vibration motor is attached to the lower surface of 74, a pair of V-shaped rolls 77 are pivotally attached to the upper part of 76, a pedestal is fixed to the floating table 74, and one roller 78 is pivotally attached to each of the pedestals 81. The dovetail part 80 is inserted into the dovetail groove 79 provided on the floating table 74.
A pair of bearings 83 slide in a direction perpendicular to the tube axis by the rotation of a screw shaft 82 which is fitted with a screw shaft 82 and whose both ends are fixed to the floating table 74. A hydraulic motor 86 is connected by a universal joint 84 and is erected on a mounting base 67, and has a lever arm 85 that has a pinch roll 88 attached to one end and a rod of an operating cylinder 87 connected to the other end. It is a pedestal that pivots the middle of the . Also, A is a threaded pipe,
A' is the tapered thread part, B is the coupling, 9
0 is a coupling supply mechanism provided on the side of the mounting base 7, and 91 is a skid that supports the pipe A from the tip thereof onwards.

Next, the operation will be explained. First, the tube A is stopped on a skid 91 whose stopper position has been slid in advance according to its diameter. Next, operate the cylinder 64 to move the upper frame 63 to V
The mold roller 77 is raised until it comes into contact with the tube A, and the tip of the tube A is supported by the V-shaped roller 77. Meanwhile, in synchronization with this, the coupling ring supply mechanism 90 is operated, and the coupling ring B is automatically supplied to the parallel roller 78, so that the coupling ring B and the pipe A are positioned facing each other. Generally, the tube A is often slightly bent during manufacturing or subsequent handling. Therefore, in this state, coupling B
If it is attached to pipe A, the mismatch between the center lines of the two may lead to problems with fitting or accidents such as jamming. However, in this device, the V-shaped roller 77 and the parallel roller 78 are provided on a floating table 74, and the floating table 74 is floatingly supported by a spring 73 disposed on the coupling mounting table 67. When the tube A contacts the V-shaped roller 77, the spring 73 is actuated, thereby causing the parallel roller 7
8 and the coupling ring B placed thereon also float and naturally follow the bending of the pipe A. Therefore, by simply leaving the coupling B stationary on the parallel roll 78, the taper thread can be fixed regardless of the bending of the pipe. The centers of portion A' and coupling B can be automatically aligned. In addition, parallel roller 7
8 has an alignment adjustment mechanism, so by rotating the screw shaft 82 in advance to move the bearing 81 and adjusting the opening degree of the pair of parallel rollers 78, even if the outer diameter of the pipe changes, , which allows for the above-mentioned floating.

Next, the coupling B approaches the direction of the pipe A by the cylinder 70 while being rotated by the hydraulic motor 83, and begins to be threadedly engaged with the tapered threaded portion A', but at this time, the vibration motor 75 is activated,
By applying slight vibrations to the rotating coupling B, it is possible to prevent poor biting at the start of screwing.

In this conventional device, when the coupling B is screwed onto the threaded portion A' of the pipe A, the coupling B and the pipe A are connected to a parallel roller 78 fixed on the same floating table 74 and a V-shaped roller 77. Since it is supported by the parallel roller 7 in advance,
8, the centers of the coupling B and the tube A will be aligned with each other based on their respective outer diameters. However, due to the thread machining conditions of coupling B and tube A, the center of the outer diameter of the coupling and tube does not exactly match the center of the threaded part, and tube A may be bent after machining. ,
When the center lines of the threaded portion of the coupling ring and the threaded portion of the tube coincide, this is hardly expected. If the thread is a triangular thread, even if there is some mismatch in the center lines of the threaded part between the coupling ring and the pipe, this will not cause too much of a problem in the threading of the coupling ring and the pipe; however, if the thread is a square thread, If there is a mismatch in the center lines of the parts, or even if there is a mismatch in the centers of the threaded parts, the threaded parts will interfere and it will be difficult to screw together, making it difficult to screw the coupler B smoothly into the threaded part of the pipe A to the specified position. Not only is it impossible to do so, but there is also a risk of galling of the screws, damage to the threads, etc. For this reason, it is necessary to have a guard stationed at all times.
This was a major drawback of conventional devices.

[Purpose of the invention]

The present invention is one of the inventions made in order to solve the drawbacks of the conventional device in a coupling starter that screws a threaded part such as a coupling into a threaded pipe as described above. Incorrect screwing caused by mismatch between the center of the pipe and the center of the threaded part of the pipe, or bending of the pipe, etc.
The purpose is to prevent screw galling and thread damage.

[Summary of the invention]

In order to achieve the above object, the present invention provides a screwing device constituting a coupling tarter with a radial floating mechanism and an angular floating mechanism each equipped with a locking device, and attaches the coupling to the threaded portion of the pipe. When doing so, first set the radius floating mechanism at the predetermined position,
Next, by operating the angle floating mechanism near where the threaded part of the coupling ring and the threaded part of the pipe come into contact, the centers and center lines of the threaded part of the coupling ring and the threaded part of the pipe are aligned, and the coupling is placed in a predetermined position on the pipe. The present invention aims to provide a coupling starter that can be smoothly screwed into position.

[Embodiments of the invention]

FIG. 1 is a sectional view of the main parts of a screwing device showing an embodiment of the present invention, in which 1 is a chuck configured to open and close a collet 1a via a shaft 3 by driving an oil motor 2, 4 is a spindle; 5 is a gear, an oil motor rotates the spindle 4 via 6 and 7, and 8 is a spring box. As shown in FIG. 2, the spring box 8 consists of a spring casing 8a, a rod 8b to which a cam follower 8d is pivoted at one end, and a spring 8c. , spindle 4
Since the outer periphery of the chuck 1, which is attached to the chuck 1 through a Waldham joint (not shown), is rotatably gripped via the spring 8c, the chuck 1
can float freely in the radial direction to some extent, forming a radial floating mechanism. Reference numeral 9 denotes a locking device operated by a hydraulic cylinder for fixing the chuck 1 to the casing 11 at a predetermined position. The locking device includes a hydraulic cylinder 9a and a plunger 9 as shown in FIG.
A hydraulic system consisting of b and spring box 8
The floating chuck 1 is fixed at a predetermined position by pressing the cam follower 8d in the direction of the arrow and fixing it to the outer circumference 11a of the chuck of the casing. Reference numeral 10 denotes a spherical seat 1 for bringing the chuck part 21 of the screwing device, including the casing 11, spindle 4, chuck 1, oil motors 2, 5, etc., into spherical contact with the main body 12 around the center point 13 of the chuck part 21;
A plurality of numerals 4 are fixed to the main body 12 for the purpose of balancing the chuck portion 21 sliding on the spherical seat 10 and tilting toward the chuck 1 due to its own weight around the center point 13. This is a balancer that supports the outer periphery. The above-mentioned spherical seat 10 and balancer 14 balance the weight of the chuck part 21 and the spring force of the balancer 14, so that the center line 15 of the chuck part 21 is aligned with the center point 1 of the spherical seat 10.
It constitutes an angular floating mechanism that can precess freely to a certain extent around 3. Again 1
6 is a locking device operated by a hydraulic cylinder for returning and fixing the angle floating mechanism in the floating state to its original position; 18 is a DC motor that drives the screw shaft 19 to move the screwing device main body 12 in the horizontal direction; It is. Also, A is the tube, A' is its threaded portion, B is the coupling, and B' is its threaded portion.

Next, the operation will be explained. In FIG. 4, the screwing device R, which grips the coupling B conveyed via the conveyance device P and the insertion device Q with the chuck 1, moves in the direction of the arrow 20 about its rotation center axis 17.
Rotate 90° and attach the coupling ring B to the tube clamp device S.
Place it opposite tube A which is clamped above. Next, as shown in FIG. 1, the oil motor 5 is operated to rotate the spindle 4 and the chuck 1, which is connected to one end of the spindle 4 via a Waldham joint (not shown), via the gears 6 and 7. At the same time, the DC motor 18
Drive the screw 19 through the screw device main body 12
move it in the direction of tube A. In general, the coupling rings B have different weights. Therefore, when the chuck 1 grips the coupling B, if the radial floating mechanism is in operation, the gripping center of the chuck 1 gripping the coupling B will be in a different position due to the difference in the weight of the coupling B. As a result, the gripping center of chuck 1 and the center of tube A differ from coupling to coupling, and in extreme cases tube A cannot be inserted into coupling B. Therefore, a locking device of a radius floating mechanism is usually activated to fix the center of the chuck 1 at the center of the screwing device. The same applies to the angular floating mechanism. When the coupling B reaches a predetermined position in the tube A, the locking device of the radial floating mechanism is released, allowing the chuck 1 to float radially. At this time, when the coupling B further approaches the pipe A and a portion of the screws of both are in contact with each other, the coupling B and therefore the chuck 1 are pressed in the opposite direction to the abutting part, and the radius floating mechanism functions to cause the chuck 1 to come into contact with the pipe A. moves in that direction, so interference between the screw threads can be prevented. Proceeding further, the threaded part of the cutlet spring
When B′ reaches the vicinity where it comes into contact with the threaded part A′ of the pipe,
Due to bending of the pipe, etc., the threaded part of the coupling
The center line of B′ does not match that of threaded part A′ of the pipe,
Since there is a risk of interference with the screw threads, if you release the lock of the angle floating mechanism and allow it to function freely, the chuck part 2
Since the inclination angle of the center line 15 is freely changed and floated according to the center line of the threaded part A' of the pipe 1, the threaded part B' of the coupling ring can be threaded without interfering with the threaded part A' of the pipe. Then, the coupling ring B can be smoothly advanced to a predetermined position on the pipe A without galling the screws or damaging the threads.

〔Effect of the invention〕

As mentioned above, the chuck portion of the screwing device of the coupling starter is equipped with a radius floating mechanism and an angle floating mechanism, and when screwing the coupling into the threaded portion of the pipe, the radius floating mechanism is first activated. Next, since the angular floating mechanism is configured to function, even if there is a mismatch in the center or mismatch in the center line of the respective threaded portions of the coupling ring and the pipe, this will not cause galling of the threads or damage to the threads. Now I can smoothly advance the coupling to the desired position on the tube.

[Brief explanation of the drawing]

Figures 1 to 4 show embodiments of the present invention, with Figure 1 being a sectional view of the main parts of a screwing device, Figure 2 being an enlarged view of a spring box, and Figure 3 being a radius floating locking device. FIG. 4 is a plan view of related devices of the coupling starter.
5 to 7 are a plan view, a side view, and a partially enlarged view of the conventional device. In the figure, 1 is a chuck, 2 is an oil motor, 3 is a shaft, 4 is a spindle, 5 is an oil motor, 6, 7
is a gear, 8 is a spring box, 8a is a spring casing, 8b is a rod, 8c is a spring, 8d is a cam follower, 9 is a locking device, 9a
is a cylinder, 9b is a plunger, 10 is a spherical seat,
11 is the casing, 12 is the main body, 13 is the center point of the spherical seat, 14 is the balancer, 15 is the center line of the chuck, 16 is the locking device, 17 is the rotation center axis of the main body, 18 is the DC motor, and 19 is the screw shaft. , 21 is a chuck portion A is a pipe, A' is a threaded portion thereof, B is a coupling, and B′ is a threaded portion thereof.

Claims (1)

[Claims] 1. A screwing device for a coupling starter comprising a screwing device and a tube clamp device, in which the casing of the screwing device is connected to a plurality of spring boxes each consisting of a spring, a spring casing, a rod, and a cam follower.
A radial floating mechanism configured such that the chuck of the screwing device is rotatably gripped so that the chuck can be floated in the radial direction with respect to the casing, and a locking device thereof, and a casing of the screwing device. A chuck portion consisting of a chuck, a spindle, a rotary drive device, etc. is pivotally attached to the main body of the screwing device by a spherical seat, and a plurality of balancers consisting of a spring, a rod, and a spring case are arranged on the outer periphery of the main body of the screwing device. A coupling comprising an angular floating mechanism configured to allow the chuck portion to precess around the center point of the spherical seat when installed, and a locking device for the angular floating mechanism. Starter.