JP3667052B2 - Method of positioning a ring on the outer periphery of a tube insertion opening and positioning roller therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for positioning a ring on the outer periphery of a tube insertion opening and a positioning roller therefor.
[0002]
[Prior art]
One type of pipe joint is a slip-on type pipe joint. This slip-on type pipe joint is configured so that the receiving port and the insertion port can be joined by mounting a sealing material on the inner periphery of the receiving port and inserting the insertion port into the receiving port while compressing the sealing material. ing. As a slip-on type pipe joint provided with a detachment prevention function, a detachment prevention pipe joint having the configuration shown in FIG. 2 has been proposed.
[0003]
That is, in FIG. 2, a receiving port 2 is formed at the end of one of the cast iron pipes 1 to be joined to each other, and an annular rubber sealing material is formed in the sealing material receiving groove 3 on the inner periphery of the receiving port 2. 4, a lock ring receiving groove 5 is formed on the back side of the seal material receiving groove 3, and a lock ring 6 divided in one circumferential direction is attached to the lock ring receiving groove 5. Between the outer peripheral side of the lock ring 6 and the inner peripheral side of the lock ring receiving groove 5, a holding rubber ring 7 for holding the lock ring 6 in a centered state is disposed. For example, it is bonded to the outer periphery of the lock ring 6.
[0004]
On the outer periphery of the distal end portion of the insertion port 9 of the other cast iron pipe 8, a protrusion 10 that can engage with the lock ring 6 from the back side of the receiving port is formed. A tapered surface 11 is formed on the outer periphery of the distal end of the insertion port 9 including the protrusion 10 to serve as a guide when the insertion port 9 is inserted into the receiving port 2 in which the sealing material 4 and the lock ring 6 are accommodated. Has been.
[0005]
When the projection 10 of the insertion slot 9 is formed, a ring 15 having an outer circumferential groove 14 having a rectangular cross section is mounted on the outer circumference of the insertion slot 9 as shown in FIG. The molten metal is poured by the work, and the groove bottom portion 16 and the surface portion of the insertion slot 9 are melted together and then cooled and solidified. FIG. 3 shows a state in which the protrusion 10 is formed integrally with the insertion slot 9 by fixing the ring 15 to the insertion slot 9 with the molten metal, that is, the weld bead 17 in this way.
[0006]
Such welding of the ring 15 is performed as follows. That is, in FIG. 4, the ring 15 is formed in one piece in the circumferential direction and loosely fitted on the outer periphery of the insertion slot 9, and this ring 15 is pressed against the outer surface of the insertion slot 9 by a positioning roller 18 having a freely rotating structure. To do. The positioning roller 18 has a flange portion 19, and the side surface 20 of the flange portion 19 is configured to be in contact with the distal end surface 21 of the insertion opening 9. The positioning roller 18 has a roller portion 23 that is in contact with the outer peripheral surface 22 of the ring. The roller portion 23 is formed with an outer peripheral protrusion 24 having a rectangular cross section that fits into the outer peripheral groove 14 of the ring 15.
[0007]
That is, the width of the outer peripheral protrusion 24 is slightly smaller than the width of the outer peripheral groove 14, and therefore the outer peripheral protrusion 24 with the side surface 20 of the flange portion 19 of the positioning roller 18 in contact with the distal end surface 21 of the insertion opening 9. Is inserted into the outer circumferential groove 14, thereby making the insertion port 9 and the ring 15 immovable relative to each other in the axial direction of the cast iron pipe 8, so that the insertion port 9 and the ring 15 are accurately positioned in the axial direction. It is configured to be.
[0008]
Accordingly, when the ring 15 is pressed by the positioning roller 18 as shown in the drawing, the outer peripheral protrusion 24 is in contact with the ring 15 with the side surface 20 of the flange portion 19 of the positioning roller 18 in contact with the distal end surface 21 of the insertion port 9. The ring 15 is pressed against the outer surface of the insertion slot 9 by the roller portion 23 in a state where the ring 15 is positioned in the axial direction with respect to the insertion slot 9 to prevent the ring 15 from being lifted. .
[0009]
Therefore, as shown in FIG. 5, while slowly rotating the insertion slot 9 around the axial center, the molten metal 27 is poured into the outer circumferential groove 14 by the welding torch 26 immediately behind the roller portion 23 of the positioning roller 18, If the groove bottom portion 16 and the surface portion of the insertion port 9 are melted together, the ring 15 is positioned in the axial direction and in contact with the outer peripheral surface of the insertion port 9 as shown in FIG. It will be welded to the insertion slot 9 over the whole periphery.
[0010]
As shown in FIG. 3, the weld bead 17 has an outwardly raised portion 28 of the ring 15. Therefore, the raised portion 28 is scraped to smooth the outer peripheral surface 22 of the ring.
[0011]
[Problems to be solved by the invention]
In the prior art, when the ring 15 is pressed against the outer surface of the insertion slot 9 by the positioning roller 18 in a positioning state, the tip of the flange portion 19 of the positioning roller 18 is connected to the tip of the insertion slot 9 as shown in FIG. The outer peripheral protrusion 24 of the roller 18 is manually engaged with the outer peripheral groove 14 of the ring 15 loosely fitted to the outer periphery of the insertion opening 9 in a state of being in contact with the surface 21. However, since it is necessary to perform positioning, the outer peripheral protrusion 24 has almost no dimensional difference with the outer peripheral groove 14 as described above, and therefore the workability of the engagement between the outer peripheral protrusion 24 and the outer peripheral groove 14 is poor, It has the problem of being inefficient.
[0012]
Therefore, the present invention solves such problems and uses a positioning roller that engages with a ring that is fitted to the insertion opening of the tube, and this ring is positioned on the outer surface of the tube while being positioned in the tube axis direction. The object is to enable the work for pressing to be performed easily and efficiently.
[0013]
[Means for Solving the Problems]
In order to achieve this object, the positioning method of the present invention uses a positioning roller that engages with a ring that is fitted to the insertion port of the tube, and presses the ring against the outer surface of the tube while being positioned in the tube axis direction. At this time, the ring is attracted to the positioning roller by a magnetic force, and the ring and the positioning roller are engaged with each other.
[0014]
In addition, the positioning roller of the present invention is configured so that the positioning roller for pressing the ring against the outer surface of the tube while positioning the ring in the tube axis direction while being engaged with the ring fitted to the insertion port of the tube It is designed to be able to engage with this ring by adsorbing.
[0015]
Therefore, according to the present invention, since the positioning roller attracts the ring by magnetic force, the ring and the positioning roller are engaged with each other in advance. Therefore, by positioning the positioning roller with respect to the pipe, the ring is simultaneously positioned with respect to the pipe, and if the ring is pressed against the outer surface of the pipe by the roller in that state, the ring is set in the positioned state. become.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1 with the same reference numerals assigned to the same members as those shown in FIGS. The positioning roller 18 is formed of a ferromagnetic material such as a steel material including the free rotating shaft 31. By energizing the coil 32 disposed along the outer periphery of the free rotating shaft 31, the positioning roller 18 serves as an electromagnet. Configured to work. The ring 15 is formed of a material adsorbed by the positioning roller 18 functioning as an electromagnet, such as ductile cast iron.
[0017]
In such a configuration, when a protrusion is formed on the outer periphery of the insertion opening 9 of the cast iron pipe 8, the positioning roller 18 is caused to function as an electromagnet by energizing the coil 32 in advance. Then, the outer peripheral projection 24 of the positioning roller 18 is fitted in the outer peripheral groove 14 of the ring 15, and the ring 15 is attracted to the positioning roller 18. Then, the attracting positioning roller 18 and the ring 15 are moved in the tube axis direction so that the ring 15 is loosely fitted to the insertion opening 9, and the flange portion 19 of the positioning roller 18 is moved to the insertion opening 9. The tip surface 21 is brought into contact. FIG. 1 shows the state at this time.
[0018]
Next, the positioning roller 18 is moved in the pipe radial direction, and the ring 15 is pressed by the positioning roller 18 against the outer surface of the insertion opening 9 of the cast iron pipe 8. Thereafter, the current supply to the coil 32 is appropriately interrupted, and the welding operation is performed as in the conventional case.
[0019]
As described above, according to the present invention, after the ring 15 is attracted to the positioning roller 18 by the magnetic force, the ring 15 is pressed against the outer periphery of the cast iron pipe 8 in the positioning state. In addition to being able to shorten it, the effect of eliminating the failure of the setting can be obtained. Specifically, the time required to press the ring 15 against the outer surface of the insertion port 9 of the cast iron pipe 8 in the positioning state by the positioning roller 18 takes 15 seconds in the case of depending on the conventional manpower. In contrast, in the present invention, this could be achieved in 10 seconds.
[0020]
【The invention's effect】
As described above, according to the present invention, the ring is attracted to the positioning roller by magnetic force, the ring and the positioning roller are engaged, and the outer surface of the pipe is positioned in the tube axis direction by the positioning roller. Since the ring can be positioned with respect to the pipe at the same time by simply positioning the positioning roller with respect to the pipe. Can be set in a positioning state with good efficiency.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a method of positioning a ring on the outer periphery of a tube insertion opening according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a pipe joint using a pipe with an insertion ring.
3 is a cross-sectional view showing in detail a protrusion in FIG. 2. FIG.
FIG. 4 is a view showing a positioning pressing state of a ring by a conventional positioning roller.
5 is a cross-sectional view of the portion shown in FIG.
FIG. 6 is a diagram for explaining a conventional ring positioning method;
[Explanation of symbols]
8 Cast iron pipe 9 Insert 14 Outer peripheral surface 15 Ring 18 Positioning roller 24 Outer peripheral protrusion 32 Coil

Claims (2)

Using a positioning roller that engages with a ring that is fitted to the insertion hole of the tube, when the ring is pressed against the outer surface of the tube in a state of being positioned in the tube axis direction, the ring is attracted to the positioning roller by magnetic force, A method for positioning a ring on the outer periphery of a tube insertion opening, wherein the ring and a positioning roller are engaged with each other. A positioning roller that presses against the outer surface of the tube while positioning the ring in the tube axis direction while engaging with the ring that is fitted to the tube insertion opening. A ring positioning roller on an outer periphery of a tube insertion port, characterized in that the ring can be engaged with the ring.

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