JPS5832819Y2 - Joint pipe processing jig with metal ring - Google Patents

Description

[Detailed description of the invention] This invention is a method for joining fluid pipes such as water pipes, by engaging the pipe jointing uzing, which is fitted externally on the end of the joint pipe, in the axial direction of the joint pipe. , concerning a jig used for fixing a metal ring for pipe joining, which functions to prevent relative movement in the pipe axis direction between the joint pipe and the housing, to the outer peripheral surface near the end of the joint pipe. The purpose is to provide a jig useful for fixing the ring in a predetermined position by friction and shearing by plastically deforming the end portion of the tube into which the ring is inserted outward with an expanding force from within. At the point.

A method for manufacturing a pipe joint in which a joint pipe and a ring are manufactured separately, and the ring is inserted into the joint pipe to secure them together, is compared to a method in which the joint pipe and ring are integrally manufactured by casting or machining. The method has the advantage that the position of the ring can be freely selected and various types of pipe joints with rings can be manufactured at low cost. There are disadvantages to the method of fixing the ring to the pipe by welding, namely, a decrease in the engagement force between the ring and the housing due to irregularly shaped beads formed on the side surface of the ring, and anti-corrosion treatment of the inner surface of the pipe due to heating. There is no deterioration or destruction of the lining treatment such as anti-corrosion treatment, and it has the advantage that it can be fixed using a technique that is simpler and more accurate than welding such as pipe expansion.

The joint pipe processing jig with a metal ring according to the present invention is used when a method with such advantages is adopted, and the metal ring for pipe jointing is attached to the outer peripheral surface near the end of the joint pipe. When fixing, the jig is used by being fitted on the outside of the pipe, and has an inner diameter that is smaller than the outside diameter of the joint pipe, and has a jig that is inserted into the outside of the joint pipe on its inner circumferential surface. It should have a concave circumferential groove that fits into the fitted metal ring, and be constructed to have a strength that can withstand the tube expansion force that plastically deforms the tube portion corresponding to the insertion position of the ring outward. It is characterized by:

That is, the tube expansion force acts not only on the tube but also on the ring inserted into the tube.

Therefore, for example, when fixing a ring to a pipe by applying only the tube expansion force, the ring must be deformed more than the tube in order to prevent the ring from deforming due to the tube expansion force and to ensure the fixation force due to friction and shear. There are restrictions on the ring configuration, such as the use of materials and shapes that are resistant to corrosion.

However, according to the present invention, by attaching the jig, deformation of the ring against the tube expansion force can be reliably prevented regardless of its material strength, and only the tube can be deformed. Both the ring and the tube can be made of materials that suit the conditions of use, and this allows the method of effectively fixing the ring to the tube by expanding the tube to ensure the desired ring-attached joint tube. Moreover, it has now been possible to configure it in a high quality state.

Hereinafter, embodiments of the present invention will be described based on illustrative drawings.

FIG. 1 shows a pipe joint for joining two joint pipes 1, 1 whose ends are butt-faced, and both joint pipes 1,
1 is a metal ring 2 for pipe connection on each outside near the pipe end.
, 2, and forming circumferential grooves 4a, 4a on the inner circumferential surface of which these rings 2, 2 are fitted.A housing 4 is externally fitted extending between both ends of the pipe. In addition, a watertight (or airtight) rubber ring 5 is sandwiched between the outer circumferential surface of the tube end and the inner circumferential surface of the housing.

The fixing structure between the ring 2 and the tube 1 is achieved by plastically deforming the tube end portion, into which the ring 2 having an inner diameter approximately equal to the outer diameter of the tube 1 is inserted, outward by a tube expansion force, so that the tube end portion is A friction surface 1a that presses into surface contact with the inner circumferential surface of the ring and engaging portions 1b that engage both side surfaces of the ring 2 are formed. It is configured to be fixed at a predetermined position on the outer peripheral surface.

Figures 2 and 3 show a joining pipe processing jig 3 with a metal ring used for fixing the ring 2 to the pipe 1 by applying a pipe expansion force to the pipe end portion, and the processing procedure using the same. shows.

The jig 3 has an inner diameter slightly smaller than the outer diameter of the joint pipe 1C, and has a concave circumferential groove 3a formed on its inner circumferential surface to fit into the ring 2 fitted on the outside of the joint pipe 1. At the same time, a positioning locking part 3b is formed at one end of the axis to lock onto the end surface of the joint pipe 1 to fix the distance of the concave circumferential groove 3a from the joint pipe end. The two partial arc-shaped members 3A are connected to each other by bolts and nuts 6, and the tightening by the bolts and nuts 6 is performed by force. The wall thickness of the tube is designed to be strong enough to withstand the above-mentioned tube expansion force.

To explain how to fix the ring 2 to the pipe 1 using the jig 3 configured in this way, as shown in Fig. 2, after inserting the ring 2 into a predetermined position on the outside of the pipe 1, as shown in Fig. 3. As shown in the figure, the jig 3 is set and a tube expansion force is applied, and then the jig 3 is separated and removed.

A tube expander 7 is used to apply tube expansion force.

As an example of this tube expander 7, as shown in the figure, an elastic body 7a fitted into the end portion of the joint tube 1 is compressed from the tube axis direction to expand the elastic body 7a radially outward. There are some that are designed to be deformed.

The tube expansion action involves pressing the inner circumferential surface of the fitting ring 2 and the corresponding outer circumferential surface of the tube 1 into contact with each other, and also using a jig to expand the outer portions of the tube 1 located on both sides of the fitting ring 2. It is pushed outward until it comes into pressure contact with the inner circumferential surface, thereby forming the friction surface 1a and the engaging portions 1b, 1b on the tube 1.

4, the jig 3 is divided into a main body portion 3A forming a circumferential groove 3a and a portion 3B having a positioning locking portion 3b, and these are interconnected via a bolt B and a long hole H. This figure shows a configuration in which the positioning locking portion 3b can be freely changed and fixed in position in the direction of the tube axis.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the jig for processing a jointed pipe with a metal ring according to the present invention, and FIG. 1 is a partially cutaway side view of the joint;
FIGS. 2 and 3 are partially cutaway side views showing processing steps using a jig, and FIG. 4 is an enlarged vertical sectional side view of main parts in another embodiment. 1... Joining pipe, 2... Metal ring for pipe joining, 3...
... Jig for processing jointed pipes with metal ring, 3a... Concave circumferential groove.

Claims (1)

[Scope of utility model registration request] A metal ring 2 for pipe jointing is attached to the outer peripheral surface near the end of the joint pipe 1.
The jig 3 is used by being fitted on the outside of the pipe 1 when fixing the pipe, and has an inner diameter slightly larger than the outer diameter of the joint pipe 1. A concave circumferential groove 3a is formed to fit the metal ring 2 inserted on the outside of the joint pipe 1, and a portion of the pipe 1 corresponding to the insertion position of the ring 2 is plastically deformed outward. A jig for processing jointed pipes with a metal ring, characterized in that the jig is constructed to be strong enough to handle the pipe expansion force.