JP3217283B2 - Insertion ring press-fitting device for cast iron tubes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an insertion ring press-fitting device for a cast iron tube.

[0002]

2. Description of the Related Art A slip-on type joint is known as an earthquake-resistant pipe joint for cast iron pipe. This slip-on type pipe fitting is configured such that a receiving material and a receiving material can be joined by inserting a sealing material into the receiving material while compressing the sealing material into the receiving material. A pipe joint as shown in FIG. 6 has been proposed (for example, Japanese Patent Application No. 8-380).

That is, in FIG. 6, a receiving port 2 is formed at an end of one of the cast iron pipes 1 to be joined to each other. A seal material 4 is arranged, and a lock ring housing groove 5 is formed on the back side of the seal material housing groove 3, and a lock ring 6 divided in the circumferential direction is mounted in the lock ring housing 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 arranged. It is adhered to the outer periphery of the lock ring 6.

On the outer periphery of the tip end of the insertion opening 9 of the other cast iron tube 8, a projection 10 is formed which can be engaged with the lock ring 6 from the back side of the reception opening. A tapered surface 11 serving as a guide when inserting the insertion port 9 into the receiving port 2 is formed on the outer periphery of the distal end of the insertion port 9 including the projection 10.

[0005] By the way, the convex portion 10 having a function of preventing detachment is provided.
As shown in FIG. 7, a cast iron insertion ring 12 is press-fitted to the outer periphery of the straight insertion opening 9 and welded or welded, and finally the end of the insertion tube 9 including the insertion ring 12 is tapered. I was cutting.

In the above, when the ring 12 is press-fitted into the insertion opening of a cast iron pipe, the pipe 1 is placed on a pipe support 14 as shown in FIG.
Is set, the insertion ring 12 is supported by the clamp 15 on the insertion port 9 side, the position is adjusted, and the insertion ring 12 is pressed in the axial direction by the hydraulic cylinder 16 to forcibly press-fit the outer surface of the insertion port 9. Had been In the drawing, reference numeral 17 denotes a reaction force receiving plate for supporting the cast iron tube at the time of press fitting.

[0007]

By the way, in the above press-fitting step, at the time of press-fitting, the ring 12 is tightly fitted to the outer diameter of the insertion opening and is expanded and deformed.
The precision support of the tube 15 becomes difficult, and the centering of the insertion ring 12 with respect to the tube 1 must be adjusted in view of the slight warping deformation of the tube itself as shown by a dotted line in FIG. In order to cope with an indefinite error, the vertical position adjustment of the clamp 15 with respect to the axis of the clamp is performed exclusively by manual operation, so that there is a problem that labor saving cannot be achieved.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and comprises a pair of rollers having axes parallel to each other with their axes parallel to the tube axis and along the tube axis. A tube support having a plurality of pairs of aligned tube supports, a reaction force receiving plate for axially supporting a tube end of the tube on the tube support, and an insert facing the other tube end on the tube support. An opening ring support ring, a propulsion device for pressing the insertion ring support ring against a pipe end on the tube support base, and an insertion ring outer surface that is externally fitted to the inner surface of the insertion ring support ring and the outer periphery of the tube insertion. And a packing having a rib extending radially on an inner surface thereof.

[0009]

Next, an embodiment of the present invention will be described. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a front view of an insertion ring support ring, FIG. 4 is a sectional view of the same, and FIG. FIG.

In the casting iron pipe insertion ring press-fitting device of the present invention, the pair of two rollers 20 and 20 whose axes are parallel are connected to the axis of the pipe shaft 1A.
Tube support parts aligned in parallel with each other and along the tube axis 1A
21; a tube support gantry 23 having a reaction force receiving plate 22 for supporting the tube end of the tube 1 on the tube support portion 21 in the axial direction; and an insertion opening facing the other end of the tube on the tube support gantry 23 A ring support ring 24, a propulsion device 25 for pressing the insertion ring support ring 24 against a pipe end on the pipe support base 23, and an inner surface of the insertion ring support ring 24 as shown in FIGS. An elastic ring body fitted between the outer surface 26A of the mouth ring 26 and a packing 27 having a rib 27A extending radially on the inner surface as shown in FIG.

In the above description, one or two rollers are used as drive rolls for the rollers 20 of the tube support base 23 so that the tubes can be rotated. Also, the insertion ring support ring 24,
It comprises an attachment 24A and a base frame 24B, and the base frame 24B is slidable with respect to the base 24C.

A hydraulic cylinder is provided behind the attachment 24A as a pressing propulsion device 25. The attachment 24A has various diameters corresponding to the diameter of the pipe, and can be attached to the base frame 24B as shown by the dotted line in FIG.

In the drawings, reference numerals 24c and 24D denote attachments 24.
A bracket for fixing A to the base frame 24B, and a bolt 24E for fixing the attachment 24B to the base frame 24B. Next, the packing 27 fills the gap between the attachment 24A and the insertion ring 26, absorbs the positional error of the pipe, makes the insertion ring 26 fit outside the insertion port 9 without difficulty, and expands the insertion ring after insertion. 26
It is made of an elastic material to facilitate the attachment and detachment of the tube. The larger the diameter of the tube, the harder it becomes.The sponge body of ordinary neoprene rubber for small-diameter tubes and hard neoprene rubber for large-diameter tubes Is used.

[0014]

Next, embodiments of the present invention will be described. First, as shown by a dotted line in FIG. 1, the cast iron tube 1 is placed laterally on the roller 20 of the tube support portion 21, the position of the reaction force receiving plate 22 is determined according to the length of the cast iron tube 1, and the position is determined according to the tube diameter. Attachment 24
A is selected, a packing 27 is fitted therein, an insertion ring 26 is inserted into the packing 27, and fixed to the base frame 24B.

Next, the pipe is rotated by the roller 20, the center of the pipe 1 and the packing 27 are aligned, the hydraulic cylinder 25 is driven to push the attachment 24A to the insertion port, and the insertion ring 26 is pushed into the insertion end.

At this time, even if the insertion ring 26 is radially expanded upon insertion, its deformation is absorbed by the elastic deformation of the packing 27 and its inner rib 27A, and the gripping force of the insertion ring 24 is abnormally strong. This prevents the insertion opening 9 into which the insertion ring 26 is fitted when retracted. After the insertion ring is attached in this manner, the low-melting metal is melted and penetrated into the interface between the insertion port 9 and the insertion ring 26 and adheres to the interface as before, or after the insertion ring 26 is welded to the insertion port 9, The pipe end is tapered.

[0017]

As described above, according to the present invention, when the insertion ring for retaining is attached to the insertion port, the insertion ring can be automatically press-fitted by employing the insertion ring support ring and the packing. This makes it very easy to attach the insertion ring, which has been manually performed in the past.

Further, since the packing increases the positional tolerance between the insertion ring support ring and the pipe, the present invention has an effect that it can be applied even when the pipe has a curved deformation or the like.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view of an insertion ring support ring according to the embodiment of the present invention.

FIG. 4 is a sectional view of the same.

FIG. 5 is a front view of the packing.

FIG. 6 is a sectional view of a joint portion of a cast iron tube.

FIG. 7 is a sectional view showing an embodiment of a conventional example.

FIG. 8 is a sectional view showing an embodiment of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cast iron pipe 1A ... Pipe shaft 9 ... Insert 20 ... Two pair of rollers 21 ... Pipe support 22 ... Reaction force receiving plate 23 ... Pipe support stand 24 ... Insert ring support ring 25 ... Propulsion device 26 ... Insert Ring 26A… Outer surface 27… Packing 27A… Rib

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 19/04 F16L 9/02

Claims (1)

(57) [Claims] 1. A tube support portion in which a plurality of pairs of rollers, whose axes are parallel, are arranged in a plurality of pairs with their axes parallel to the tube axis and along the tube axis. A tube support gantry having a reaction force receiving plate for supporting in the direction, an insertion ring support ring facing the other tube end on the tube support gantry, and a tube end on the tube support gantry for connecting the insertion ring support ring. And a resilient ring body fitted between the inner surface of the insertion ring support ring and the outer surface of the insertion ring externally fitted on the outer periphery of the pipe insertion port, and extends radially on the inner surface. An insertion ring press-fitting device for a cast iron tube, comprising a packing having ribs.