JPH0726011Y2 - Grooving tool for stainless steel pipe - Google Patents

Description

TECHNICAL FIELD The present invention relates to a grooving tool, and more particularly to a tool for simultaneously forming an annular groove into which a retaining ring is fitted and a scoring line on the outer peripheral surface of a stainless steel pipe.

2. Description of the Related Art FIG. 4 (A) shows a one-touch type insertion joint used for joining stainless steel pipes (hereinafter referred to as "steel pipes"). This plug joint consists of the joint body 11 and the joint body 11
It has a packing 12 and a retaining ring 13 arranged inside. A cylindrical packing mounting portion (14) and a retaining ring mounting portion (16) formed by an inclined surface (17) connected to the packing mounting portion (14) are provided on the inner peripheral surface of the end of the joint body (11). The packing (12) is mounted on the packing mounting portion (14), and the retaining ring (13) formed by molding a spring coil-shaped material into a ring shape is mounted on the retaining ring mounting portion (16). An annular groove 21 is formed at a predetermined position on the outer peripheral surface of the steel pipe 20 to be connected.

As shown in FIG. 4 (B), when the steel pipe 20 is inserted into the joint body 11, the packing 12 adheres to the outer peripheral surface of the steel pipe 20,
The inside of 20 is kept liquid-tight. The retaining ring 13 is fitted in the annular groove 21 of the steel pipe 20 to prevent the steel pipe 20 from coming out.

As shown in FIG. 4 (C), when the steel pipe 20 moves in the direction of the arrow, the retaining ring 13 is gradually pressed by the inclined surface 17 to reduce its diameter, and the amount of fitting into the annular groove 21 increases. The retaining strength for the steel pipe 20 becomes stronger and stronger.

The plug-in joint, which consists of as few as two parts, packing and retaining ring, has the advantages of excellent workability, such as being able to easily connect the steel pipe by simply inserting it into the joint and preventing the steel pipe from slipping out. There is.

The procedure for joining steel pipes using a bayonet joint is as follows: I) Cutting the steel pipe with a required pipe cutter.

II) Measure a line indicating the position where the annular groove should be formed from the pipe end and draw a line on the outer peripheral surface of the steel pipe.

III) Using the scoring tool as a reference, machine an annular groove on the steel pipe.

IV) Push the steel pipe with the annular groove axially into the inside of the insertion joint equipped with packing and retaining ring to join.

Problems to be Solved by the Invention The conventional joining method has the following problems.

(1) Since the scoring work at the position of the annular groove and the working operation of the annular groove are performed separately from the pipe end, workability is poor. Furthermore, two types of tools, a scoring tool and a grooving tool, are required, and there are economic and management problems.

(2) After joining pipes, it is impossible to confirm whether or not an annular groove has been processed at a predetermined position on the outer peripheral surface of the steel pipe. A fatal defect that the steel pipe comes out of the insertion joint occurs during the water flow test or during use.

Therefore, an object of the present invention is to provide a grooving tool for a stainless steel pipe capable of simultaneously performing a scoring work and an annular groove working work on the outer peripheral surface of the steel pipe at a predetermined position from the pipe end.

Means for Solving the Problems A grooved tool for a stainless steel pipe according to the present invention has a pipe cutter body (1) and a protrusion (7) forming an annular groove (21) in a stainless steel pipe (20) and a blade. Grooving roll (6) attached to pipe cutter body (1) instead of (5), and stainless steel pipe (20) rotatably attached to pipe cutter body (1) and pressed by groove roll (6) ) Two receiving rollers (8a),
(8b) and. With this grooving tool for stainless steel pipes, it is possible to rotate between the projecting position that projects radially from the receiving rollers (8a) and (8b) and the retracted position that does not project radially from the receiving rollers (8a) and (8b). At least one stopper (9) is movably mounted on the ends of the rollers (8a) (8b). The long hole formed in the stopper (9) is fitted to the end of one receiving roller (8b). The stopper (9) is elastically pressed by a spring toward the protruding position. A groove confirmation ring (10) having a raised portion inside the stopper (9) is attached to at least one of the receiving rollers (8b). When the pipe end of the stainless steel pipe (20) is brought into contact with the stopper (9), from the pipe end of the stainless steel pipe (20) to the protrusion (7) of the grooved roll (6) and the groove confirmation ring (10). The length to the protrusion is always constant. Stainless Steel Pipe (20)
The stopper (9) that abuts the outer peripheral portion of the can be rotated to the retracted position.

In the embodiment of this invention, a pair of stoppers (9) are provided at both ends of the receiving rollers (8a) and (8b). Further, the stopper (9) is rotatably attached to the one receiving roller (8a).

By determining the position of the annular groove from the end surface of the stainless steel pipe by the stopper and attaching the groove confirmation ring having the raised portion to the receiving roller, the scoring work and the annular groove working operation can be performed at the same time. This eliminates the need for a single scoring operation and scoring tool, which reduces the cost of the tool and improves productivity, and also facilitates tool management.

In addition, after joining the stainless steel pipes, the scoring lines formed at the predetermined positions on the outer peripheral surface of the stainless steel pipes can be visually inspected to reliably and easily confirm that the annular groove has been formed in the stainless steel pipe. It is possible to prevent the stainless steel pipe from coming off in advance. Further, by rotating the stopper to the retracted position, the annular groove and the scoring line can be formed at a desired position.

Embodiment An embodiment of a groove tool for a stainless steel pipe according to the present invention using a pipe cutter body is shown in FIGS.
This will be described below.

FIG. 1 is a front view of a grooving tool for a stainless steel pipe according to the present invention showing a main body portion supporting a receiving roller in a cross section, FIG.
The figure shows the side view, and FIG. 3 shows the side view of the pipe cutter.

The grooving tool for a stainless steel pipe according to the present invention has a pipe cutter body 1 and a ridge 7 that forms an annular groove 21 in the stainless steel pipe 20 and is replaced with the blade 5 to form a grooving roll 6 attached to the pipe cutter body 1. And the pipe cutter body 1
Two receiving rollers supporting a stainless steel tube 20 rotatably mounted on and pressed by the grooving roll 6.
It has 8a and 8b. A grooved roll 6 having an annular groove-shaped protrusion 7 is attached to the pipe cutter body 1 in place of the blade 5 for cutting the stainless steel pipe 20. Stoppers 9 and 9 are provided at both ends of the two receiving rollers 8a and 8b, respectively, so that the center of the protrusion 7 of the grooved roll 6 and the position of the annular groove 21 from the tube end of the stainless steel tube 20 coincide with each other. It always protrudes upward with the receiving roller 8a as the center of rotation. Although not shown, one end of the spring wound around the receiving roller 8a has a stopper 9
And the other end is locked to the pipe cutter body 1.
The spring always urges the stopper 9 to rotate upward. That is, the pair of stoppers 9 includes the receiving rollers 8a and 8b.
Between the receiving roller 8a and a receiving position that does not radially project from the receiving rollers 8a, 8b, and the receiving roller 8a is rotatably attached to the pipe cutter body 1 so as to be rotatable. It is attached to both ends of 8b.

A long hole is formed in the stopper 9 so as to be fitted to the end of one of the receiving rollers 8b. The long hole determines the rotation angle of the stopper 9. The spring elastically presses the stopper 9 toward the protruding position. When the pipe end of the stainless steel pipe 20 is brought into contact with one stopper 9, the length from the pipe end of the stainless steel pipe 20 to the protrusion 7 of the groove roll 6 and the protrusion of the groove confirmation ring 10 is always constant. And The other stopper 9 that comes into contact with the outer peripheral portion of the stainless steel pipe 20 is rotated to the retracted position.

In the embodiment of the present invention, the groove confirmation ring 10 is attached to the outside of the ends of the receiving rollers 8a and 8b and to the inside of the stopper 9. In the groove confirmation ring 10, a scoring line such as a knurled pattern is engraved on the outer peripheral surface of the stainless steel pipe 20. The groove confirmation ring 10 is attached to the inside of the stopper 9 so that when the stainless steel pipe 20 is joined to the insertion joint, the knurled pattern is near the outside of the end face of the insertion joint. In the figure,
2 is a guide member and 4 is a roller.

At the time of use, set the pipe end surface of the stainless steel pipe 20 against the stopper 9 on the two receiving rollers 8a, 8b of the grooving tool, and rotate the adjusting screw 3 to set the grooving roll 6 to the stainless steel pipe. Press on the outer peripheral surface of 20. At this time, one stopper 9 is pressed by the outer peripheral surface of the stainless steel pipe 20 and is rotated downward. By rotating the adjusting screw 3 and causing the protrusion 7 of the grooved roll to bite into the stainless steel pipe 20, at the same time, the pipe cutter body 1 is rotated to form the annular groove 21 at a predetermined position on the outer peripheral surface of the stainless steel pipe 20. .

Further, the outer peripheral surface of the stainless steel pipe 20 is pressed by the knurled groove confirmation ring 10 simultaneously with the processing of the annular groove 21, and a knurled pattern is formed at a predetermined position on the outer peripheral surface of the stainless steel pipe 20. In place of the knurled groove confirmation ring 10, a semicircular shape is provided at a predetermined position on the end surface of the grooved roll 6,
It is also possible to form an appropriate raised portion such as a triangle and form a concave line mark at a predetermined position on the outer peripheral surface of the stainless steel pipe 20 at the same time when the annular groove 21 is processed.

As described above, in this embodiment, the stainless steel pipe 20 can be mounted from either the left or right side of the groove tool for the stainless steel pipe by attaching the pair of stoppers that determine the position of the annular groove from the end surface of the stainless steel pipe. You can Further, the groove checking ring can be attached to the inside of the stopper of the grooving tool or the protruding portion can be provided at the end of the receiving roller, so that the scoring operation and the annular groove processing operation can be performed at the same time. This eliminates the need for independent scoring work and scoring tools,
The cost of the tool can be reduced, the productivity can be improved, and the tool can be easily managed. Furthermore, by visually checking the knurled pattern or the scoring line such as the concave line mark formed at the predetermined position of the stainless steel pipe 20, it is possible to surely and easily confirm that the annular groove has been processed in the stainless steel pipe after the joining of the stainless steel pipes. It is possible to prevent the stainless steel pipe from coming out of the insertion joint in advance. By rotating the stopper 9 to the retracted position, the annular groove and the scoring line can be formed at a desired position.

When a stainless steel pipe having an annular groove formed by the grooving tool of the present invention is inserted into the insertion joint, a knurled pattern or a scoring line such as a concave line mark formed on the outer peripheral surface of the stainless steel pipe 20 near the outer end of the insertion joint. It is possible to easily confirm that the annular groove is provided and the annular groove is provided after joining.

One stopper 9 is provided only on one end of the receiving rollers 8a and 8b.
May be attached, or only one groove confirmation ring may be attached at a predetermined position on the opposite side of the stopper 9. By setting two stoppers 9 at both ends of the receiving roller so that it can be rotated up and down and by providing two groove confirmation rings 10, when set on the receiving roller 8 of the stainless steel pipe 20, it can be freely moved from either left or right. Work becomes easier.

Effect of the Invention In the present invention, by performing the positioning work of the annular groove and the scoring work at the same time, it is possible to omit a single scoring work and improve the productivity. Furthermore, simultaneously with the processing of the annular groove, a groove confirmation ring with a raised portion is used to form a groove confirmation mark on the outer peripheral surface of the steel pipe so that the presence or absence of the annular groove can be easily confirmed even after joining pipes, and the fatal loss of the stainless steel pipe can occur. It is possible to prevent the occurrence of mechanical defects in advance, improve the quality, and have a remarkable practical effect.

[Brief description of drawings]

Fig. 1 is a front view of the groove tool of the present invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is a side view of a pipe cutter, and Fig. 4 (A) is a state before insertion of a stainless steel pipe. Partial sectional view of the plug-in joint shown in FIG. 4, FIG. 4 (B) is a partial sectional view of the plug-in joint showing a completed connection, and FIG. 4 (C) is a part of the plug-in joint showing the state in which the stainless steel pipe moves in the direction of pulling out. FIG. 1 ... Pipe cutter body, 5 ... Blade, 6 ... Grooving roll, 7 ... Annular groove type protrusion, 8a, 8b ... Receiving roller, 9 ...
… Stopper, 10 …… Groove confirmation ring, 20 …… Stainless steel pipe, 21 …… Annular groove,

Claims (3)

[Scope of utility model registration request] 1. A pipe cutter body, a grooving roll having protrusions forming an annular groove on a stainless steel pipe and attached to the pipe cutter body in place of a blade, and a groove rotatably attached to the pipe cutter body. A grooved tool for a stainless steel pipe provided with two receiving rollers for supporting a stainless steel pipe pressed by a mounting roller, in a protruding position protruding radially from the receiving roller and a retracted position not protruding radially from the receiving roller. At least one stopper is rotatably attached to the end of the receiving roller, and the long hole formed in the stopper is fitted to the end of one of the receiving rollers. Press and attach the groove check ring with the protrusion inside the stopper to at least one of the receiving rollers, and use stainless steel for the stopper. When the pipe end of is contacted, the length from the pipe end of the stainless steel pipe to the protrusion of the grooved roll and the protrusion of the groove confirmation ring is always constant, and a stopper that contacts the outer peripheral portion of the stainless steel pipe is used. Grooving tool for stainless steel pipes, which can be rotated to the retracted position. 2. The grooving tool for a stainless steel pipe according to claim 1, wherein the pair of stoppers are provided at both ends of the receiving roller. 3. A grooving tool for a stainless steel pipe according to claim 1, wherein a stopper is rotatably attached to one of the receiving rollers.