JPS59103097A - Method of connecting pipe body - 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 Technical Field of the Invention The present invention relates to a method suitably used for crimping and connecting thin-walled tubes, and more specifically, a method that provides a special structure on the outer peripheral wall surface of the fitting portion of the tube. The present invention relates to a pipe body connection method in which the intermittent recess forming roller and the fitting part between a pair of continuous recess bodies or the fitting part in a joint part between a pipe joint and a pipe body are connected by pressure.

In the prior art, the insertion part where the ends of two thin-walled pipe bodies overlap or the joint part between the pipe joint and the pipe body is locally pressurized from the outer peripheral wall surface, and a recess is formed when the pressure is applied. A method of crimping and connecting the pipe bodies is, for example, by inserting the end of the other pipe body into the joint part of one pipe body having a joint part in which an elastic ring is fitted, and then fitting the end part of the other pipe body in this way. A method of forming a continuous hexagonal recess around the overlapping portion of the end of the tube by pinching the outer circumferential wall surface of the insertion part of the tube formed by using a diagonal recess forming tool. is already known.

This method is used at some construction sites because it is a convenient way to easily crimp connect thin-walled pipes, but the connection strength at the fitting part of the pipe and the airtightness of the connection part are limited. It has been difficult to pressurize and deform the portion in which the recess is formed by applying a uniform force to the outer peripheral wall surface of the tubular body insertion portion without leaving any gaps, as the above-mentioned force and conditions greatly affect the deformation.

In addition, due to the principle of such a method, the recess formed in the insertion part inevitably continues to be formed, which not only weakens the connection strength of the tube insertion part, but also makes it airtight. It has a number of drawbacks, such as poor performance, and is therefore unsatisfactory as a connection method for thin-walled pipes such as gas pipes that require high airtightness.

SUMMARY OF THE INVENTION In view of the above, the present inventors have made various studies and as a result have come to provide the method of the present invention.

Therefore, the first object of the method of the present invention is to provide excellent airtightness, high connection strength at the insertion part of the tube body, and no loosening of rotation even after many years of use. An object of the present invention is to provide a crimp connection method for pipe bodies.

A second object of the present invention is to provide a method for crimping and connecting pipes that can be repeatedly performed with the same quality regardless of the operator.

Therefore, the present invention, which was made to achieve the above object,
Its gist is as follows. That is, it utilizes a specially constructed intermittent recess forming roller in which a plurality of recess forming protrusions are alternately staggered so that only their ends overlap with each other, and a pair of continuous recess forming rollers. By rolling these rollers in pressure contact with the outer circumferential wall surface of the tube body insertion part, pressure deformation is produced in the overlapping part of the two tube bodies of the tube body search part, and this causes the rolling of the rollers. A continuous recess and a continuous recess are formed in the movable portion so as to overlap each other at each end, and the two tubes are connected by pressure.

Furthermore, the method of the present invention can be carried out more easily and conveniently by using a tube connecting device originally developed by the present inventors.

PREFERRED EMBODIMENTS OF THE INVENTION The method of the present invention will be explained below by taking preferred embodiments as examples, but first the above-mentioned pipe connection device will be explained.

This pipe connection device includes the above-mentioned intermittent recess forming roller,
A pair of continuous recess-forming rollers are pressed and held in an appropriate state against the outer circumferential wall of the fitting portion of the tube, and these rollers are caused to roll along the outer circumferential wall of the fitting portion of the tube. ,
1st. As shown in Fig. 2, a plurality of clamping clampers for fixedly clamping the fitting portion of the tube body and concave forming protrusions are provided around the circumference so that only their respective ends overlap each other and are staggered from each other. A device comprising an intermittent recess forming roller, a pair of continuous recess forming rollers, and a main body frame that correctly holds the intermittent recess forming roller on the outer peripheral wall surface of the insertion portion of the tube body when the intermittent recess forming roller rolls. It is.

An intermittent recess forming roller 3 is rotatably interposed in the stepped notch 1a so that the bolt 7 passes through it, and a screw hole 1b is formed at the other end of the roller 3, and a screw hole 1b is formed in the other end. An adjustment screw 6 to which a support 5 is fixed to the continuous concave forming roller 4° 4 is screwed together so as to be able to move up and down.

Reference numeral 2 denotes a clamping clamper, and the clamper 2 is formed into two halves, and has semi-cylindrical clamping parts 2a, 2a corresponding to the outer diameter of the tube to be connected. After the two pieces are overlapped on the outer periphery of the fitting part C, the poles 2b and 2b are tightened at both ends to fix the tube body fitting part C in an immovable state.

The circumferential grooves 2b formed on the outer periphery of each of the semi-cylindrical holding parts 2a, 2a are used when forming the interrupted recesses A and the continuous recesses B in the tube insertion part C, as will be described later. There are guide grooves for guiding the intermittent recess forming roller 3 and the continuous recess forming roller 4. The rotary position of both rollers 3 and 4 during recess forming is determined by engaging with a protrusion 5a protruding from the upper part of the continuous recess forming roller support 5 described above.

Reference numeral 3 denotes an intermittent recess-forming roller, and the roller 3, as shown in FIG. The ridges of the concave molding protrusions 3a in each direction are alternately staggered with their respective ends overlapping each other as shown in Figs. 5 and 6. It is built protruding from the top. In addition, by removing this concave forming roller 3id and the bolt hole 1d [bolt 7] on the main body frame l, it can be replaced with another type prepared in advance, as appropriate (not shown). This makes it possible to form a variety of different continuous recesses in which the ends of the recesses A overlap each other.The recess forming roller 3 is made up of recess forming protrusions 3a and 3a in the illustrated example. . . . is shown in double form, but it is not limited to this example, and a structure in which three or four recess forming protrusions 3a .

4 is a continuous concave forming roller, and each of them is attached to a support 5 which is attached to one end of the above-mentioned U-shaped body arm 1 so as to be able to move up and down with an adjustment screw 6, and each is attached to a support 5 using a bolt 8.8.
The pipe body is rotatably mounted on the shaft, and the pipe body is inserted and fitted in the manner shown in FIG. The degree of pressure of the intermittent recess forming roller 3 against the portion C can be freely determined.

Reference numeral 9 denotes a sorption screw that fixes the adjusting screw 6VC and the connecting concave portion forming roller support 5.

As can be understood from the longitudinal cross-sectional structure of FIG. 2, this continuous recess forming roller 4 has a disc-shaped projecting edge piece 4b that continuously projects from the outer periphery of a disc-shaped main body 4a. When forming the recess B in the tube insertion part C, the protrusion 5a formed on the upper part of the continuous recess forming roller support 5 is placed around the outer peripheral wall surface of the clamping part 2a of the clamping clamper 2. When the continuous recess B is formed in the tube insertion part C by engaging with the guide groove 2b, the rotational position thereof is properly maintained. is pressed against the outer circumferential wall surface of the tube fitting gHhC and the outer circumferential wall surface is aligned to form an annular recess B.

The formation of the recess B by the continuous recess forming roller 4 is extremely desirable in order to ensure the airtightness of the tube insertion part C, and as with the continuous recess forming roller 3 described above,
The protruding edge pieces 4b may be formed in double or triple layers.

Next, a procedure for implementing the method of the present invention when connecting the pipe bodies 11 and 12 to the pipe joint 10 using the above-described pipe connection device will be described.

First, the two ends of one pipe joint 1o are connected to the other pipe body 11.1.
Insert 2. (In this case, it is particularly desirable to wrap a tape-shaped sealant 13 between the two pipe bodies or to interpose a sealant in order to further ensure airtightness, and if such a sealant is used as appropriate. (Good.) After that, the tube body insertion portions C formed at both ends of the tube joint 10 are fixedly supported from the outer circumferential wall surface with the clampers 2, and the continuous recess forming roller support 5 is adjusted by operating the adjusting screw 6. It is lifted up and the continuous recess forming rollers 4, 4 are pressed from below the tube fitting portion C to press the tube fitting portion C from three sides in cooperation with the intermittent recess forming roller 3 (see FIG. 2). (In this case, the degree of pressure of the intermittent recess forming roller 3 against the tube insertion part CVrc is determined by the degree of pressing of the continuous recess forming roller 4.4, but in this way, the tube insertion It goes without saying that when pressing part C, it is necessary to engage each protrusion 1c and 5a in the guide groove 2b of the clamping clamper 2 in advance in order to carry out the next transfer process smoothly. .) After setting the tube to the tube connecting device to be connected using these steps, move the main body arm l around the tube fitting section C as shown by the dotted line in Figure 1. and rotate it.

In this way, when the main body arm 1 is fixedly held and rotates around the tubular body insertion part C, both the intermittent recess forming roller 3 and the continuous recess forming rollers 4, 4 touch the clamping part 22 of the clamping clamper 2. It engages in the guide groove 2b provided around the outer periphery of the tube and follows an appropriate rotation trajectory to maintain the pressure contact state, and the overlapping portion of both tubes of the tube intubation section C undergoes pressure deformation. Intermittent recesses A and continuous recesses B as shown in FIG.

As described above, according to the method of the present invention, it is possible to crimply connect thin-walled pipes with simple operations. However, as long as the tube device is capable of rotating the above-mentioned intermittent recess forming roller and continuous recess forming roller in pressure contact with the tube inserting portion, various modifications may be added to the tube device. Needless to say.

Effects of the Invention As can be understood from the above explanation, the present invention provides a method for forming an overlapping portion of a tube by rolling an intermittent recess forming roller and a pair of continuous recess forming rollers in pressure contact with the outer peripheral wall surface of the tube insertion portion. This causes pressurized deformation in the rolling parts of these rollers, thereby forming intermittent recesses F, it A... and continuous recesses B..., which overlap repeatedly at each end. Its structural feature is that the pipes are crimped to each other, or to the pipe joint and the pipes, and this structural feature provides the following unique effects: .

That is, since a continuous recess such as an interrupted recess in which only the end portions overlap is formed in the portion of the tube insertion portion where both the tubes overlap, airtightness is excellent.

Still, the intermittent recesses are so that only their ends overlap 9.7. Because of this, there is no rotational loosening between the pipe bodies, and the connection strength is strong.

In addition, since the pipe fitting part is held in pressure contact with an intermittent recess forming roller and a pair of continuous recess forming rollers on the outer circumferential wall surface and rolled while being pressed together, the two pipes and bodies are connected by pressure, so that the operator does not have to apply force. It is possible to always maintain the same quality regardless of the condition. .

[Brief explanation of the drawing]

A partially cutaway vertical cross-sectional view along the line ■-■, Fig. 3 is a diagram showing an example of a pipe body crimp-connected by the method of the present invention, and Fig. 4 is a crimp-connected pipe joint and a pipe body. FIG. 5 is a front view showing an example of the intermittent recess forming roller, and FIG. 6 is a plan view of FIG. 5. 4 is a continuous recess forming roller, 10 is a pipe joint, 11 and 12 are both tube bodies, and C is an insertion portion of the tube body. Patent applicant: Nippon Steel Pipe Fittings Co., Ltd. Patent attorney: Takashi Suzue - Procedural amendment 59.1.12 1939 Director-General of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case Patent application No. 1987-207943 2, Invention Name: Pipe connection method 3; Relationship with the Nagisa case to be amended Patent applicant: Japan Steel Pipe Fittings Co., Ltd. 4; Attorney: 5; Date of amendment order: Voluntary 6; Drawings subject to amendment (all drawings) 593-

Claims (1)

[Claims] An intermittent recess-forming roller in which a plurality of recess-forming protrusions are alternately arranged around the circumference so that only the ends of the protrusions overlap each other, and a disc-shaped protruding edge that continuously projects from the outer peripheral surface of the roller. A pair of continuous recess-forming rollers having a continuous recess forming roller are rolled on the overlapping portion of the tube fitting portion from the outer peripheral wall surface thereof while being pressed against each other, so that the two tubes are crimped and connected. How to connect a pi pipe.