JPS5821088A - Joint structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to joint structures of pipes, round bars, etc., and in particular to joints of pipes used in so-called test drilling for oil drilling, etc. It's about structure.

As the depth of the pit increases during the drilling work, drilling is performed by adding pipes of about 3 m to 5 m one by one, or by sequentially adding 2 to 4 pipes that have been joined in advance.

BACKGROUND ART Conventionally, pipes used for test drilling etc. have a male thread cut at one end and a male thread cut at the other end, and the pipes are connected by connecting male and female threads.

In the case of connections using male and female threads, when adding female and male threads, the weight of the pipe may be applied to the first thread, damaging the threads.Furthermore, when removing the threads, It was difficult to hold the axes of both pipes, and when the axes of both pipes twisted, this also led to damage to the screws.

In addition, even if the rotation of the machine on the ground is stopped due to the occurrence of a dwarf phenomenon when drilling in the pipe at a deep depth, the tip of the hole does not stop immediately due to the amount of sludge, causing a reversal phenomenon. There is also. When this happens, the threaded part of the pipe may become loose, and
The drawback was that the connection could come off in some cases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joint structure that does not rely on screws in order to eliminate such conventional drawbacks. That is, in the present invention, one end of a cylindrical member has a convex line in the axial direction and is configured with a nine-sided overflow part, and the other end engages with a convex spline of 811 parts into which a female part of another cylindrical member is inserted. The present invention provides a joint structure constituted by a female part having a rotatable 3J-shaped part having an inner peripheral surface protrusion.

The joint structure according to the present invention will be explained along with the embodiment shown in the drawings.

Fig. 1 shows a male part 2 formed at the lower end of the pipe 1, and Fig. 2 shows a female part 4 into which the male part 2 of Fig. 1 is inserted.
The upper end of the pipe 3 is shown in section. FIG. 3 also shows a cross section of the male part and the female part in a connected state.

Near the tip of the female part 2 of the pi f1, there is an axial key mount,
That is, a plurality of convex splines 5 are provided. The proximal end li6 of the convex spline 50 is somewhat inclined with respect to a plane perpendicular to the axial direction.

The #-shaped part 4 formed at the upper end of the pipe 3 has an inner pipe f7 that is integral with the pipe 3, and an outer pipe that is rotatable with respect to the pipe 3 at least within a certain range and is restrained in the axial direction. It has a double tube structure with 8. The inner peripheral surface of the inner piston is provided with a key groove, ie, an axial concave line 9, which can be engaged with the convex spline 5 of the male part 2 in the axial direction. Concave spline 90
On the base side, there is a stepped portion 13 that comes into contact with the tip of the jIiffi portion 2.
is formed. The outer pie f8 has an extension part 10 that extends beyond the end of the inner pie f7, and the inner circumferential surface of the extension part 10 has the proximal end surface 6 of the convex snow line 50 of the female part 2 inserted therein. Convex spline 11 for pressing and fixing
is provided. Convex spline 11C) The surface 12 on the pressure contact side is inclined with respect to the surface perpendicular to the axial direction, similar to the convex end surface 6.

Due to this structure, the convex sedge line 5 of part 2 of 's11
is fully inserted into the concave spline 9 of the inner pie shifter and the tip of the female mold part 2 comes into contact with the step part 13 of the inner pie shifter,
When the outer pipe 8 is rotated, the slope @12 of the convex spline 11 presses against the inclined end surface 6 of the convex spline 5 in a wedge shape, pressing the tip of the male part 2 against the stepped part 13, and the male part It is tightly connected in the axial direction to prevent it from coming off.

Once the tightening by rotation of the outer pipe 8 is completed,
The locking mechanism works, and relative rotation between the outer pipe f8 and the inner pipe sif (and the pipe l) becomes impossible. An example of the locking mechanism will be explained below with reference to FIG. 4.

In FIG. 4, a notch 20 and a slightly recessed step 21 are formed at the base end of the outer pipe 8. A handle portion 24 of a stopper JQ123 having an L-shaped heavy cross section is fixed to this stepped portion 21 with a screw 25. The handle portion 24 is made of an elastic plate-shaped spring member,
Further, the tip of the thick portion 26 of the stopper 23 forms an inclined surface 27.

A shallow step 29 and a deep step 30 are provided in the circumferential direction at positions corresponding to the notches 20 provided in the outer pipe 8 of the inner pie f3. The width in the circumferential direction of the shallow [29] is at least larger than the width of the stopper A23, and it is preferable that the width is equivalent to but slightly smaller than that during the tightening rotation of the outer pipe 8. The width of the deep step 30 is preferably larger than the width of the stopper 23.

The outer pipe 8 is locked by inserting the female mold part 2 into the female mold part 4 and rotating the outer pipe 8 after death, so that the thick part 26 of the stopper 23 moves from the shallow stage 29 of the inner pipe 3 to the deep stage 30. Then, the thick portion 2-6 automatically falls into the deep step 30 and engages with it by the action of the handle 240 made of a spring member. This prevents the outer pipe 8 from rotating due to vibration, rotation, etc., and prevents the connection from being released.

To release the locking mechanism, insert a plate-like metal fitting into the inclined surface 27 of the stopper fitting 23 and press the thick part 26 against the elasticity of the handle 24.
The connection is released by pulling up to the height of the shallow step 29 and unlocking it, and in this state rotating the outer pipe 8 in the opposite direction to the direction in which it was connected.

Although FIG. 4 shows an example of a locking mechanism, other suitable means may be used, such as driving a locking key between the outer pipe and the inner pipe.

Due to the above-mentioned nine joint structures, the rotational torque is applied to the convex shape of the male part 2 shown in Fig. 1 and fJ/E2.
2-in-5 side surface 14 and concave stripe line 9 on inner pie f7
In addition to ensuring reliable transmission between the side wall surfaces 15 of the
Even if the torsion phenomenon or reaction thereof that occurs in case n occurs, there is no fear of loosening or dislodging because the connection is not made with screws. When pulling out a pipe, in addition to the weight of the pipe, a pullout resistance load due to friction between the pipe and the hole wall is added, but this load is borne by the splines 11 and 5, which are tightened by the male and female spline slopes 12 and 6. There is no need to worry about damage to the screws.

Although only one end of each pipe is shown in the figure, it is clear that the other end also has a male-female pair structure. Furthermore, it is clear that as long as the female part has a cylindrical inner wall and the male part has a cylindrical shape, the other parts may have any shape.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a pipe end with a male section. FIG. 2 is a partially cut away view showing the end of the pipe with a female section. 3E is a sectional view of the pipe connecting portion in the connected state. FIG. 4 is an exploded perspective view of an example of the locking mechanism. Brief explanation of symbols 1. 3...Pipe, 2...Female part, 4...Female part, 5...Convex spline, 7...Inner pipe, 8...
...Outer pipe, 9...Concave stripe line, 10...
Extension part, 11... Convex spline, 13... Step part. Patent applicant Sumitomo Metal Mining Co., Ltd. Representative Patent attorney Naoto Suga (and 1 other person 121
! 1 j13Figure 4

Claims (3)

[Claims] (1) A) A first columnar member provided with a male part; and C) A second columnar member provided with a male part; a convex axial spline formed on the cylindrical outer peripheral surface near the end; 2) #female part includes a cylindrical inner pipe formed integrally with the second columnar member main body; The scissor inner pipe has an axillary shaft on the inner surface near the end, and an outer pipe in the shape of a round column, which is combined to be rotatable within a certain range at least with respect to the main body but restrained in the axial direction. The outer pipe has a concave spline that receives the convex spline of the lid part in the axial direction and restrains it in the rotational direction; The inner peripheral surface of the extension part is provided with a concave part through which the convex spline of the male armpit part can pass, and a convex part that engages with the base side of the convex spline of the male part, The hindlimb outer pipe inserted into the #s made part is rotated to engage the convex part of the outer pipe extension part with the base side of the convex spline of the male part, and thereby the first and second A joint structure characterized by connecting cylindrical members. (2) The base side of the convex spline of the male part forms a surface inclined with respect to the plane perpendicular to the axial direction, and the convex part of the outer pipe extension engages with the skeleton inclined surface. Claims characterized in that the end face also forms a surface inclined with respect to a plane perpendicular to the axial direction, so that when the outer pipe is rotated, both the inclined surfaces come into pressure contact with each other. Joint structure according to item 1. (3) The joint structure according to claim 1 or 2, further comprising an O-locking means for locking rotation between the outer pipe and the inner pipe.