JPS61229429A - Pipe joint structure and working method and device therefor - Google Patents

Abstract

PURPOSE:To increase a joint strength and centering accuracy by forming a drawing groove on a pipe and joint metal fitting and further by making the drawing groove turnable with its engaging. CONSTITUTION:A pair of right and left rollers 9, 9 for turning pipe are provided on a frame 8 and driven with turning via a motor and sprocket 11, chain 12, etc. A hydraulic cylinder 16 is arranged on the upper part of the intermediate part of the rollers 9, 9 and the roller 17 for squeezing is provided on the tip thereof. A metallic pipe 2 is placed between the pipes 9, 9 to press the pipe end part by the roller 9. The positioning is the performed by inserting the joint metal fitting 1 into the end part of the pipe 2. Grooves 3, 4 are formed respectively on the pipe 2 and metal fitting 1 with the roller 17 for squeezing by driving the roller 9 and by descending the cylinder 16 as well. Due to the metal fitting 1 being turnable for the pipe 2, the torsion of the joint part can be absorbed. The joint strength and centering accuracy are therefore increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a joint structure for connecting a pipe and a joint metal fitting, a method for processing the same, and a processing device for the same.

(Prior art and its problems) Examples of methods for connecting the fitting to the end of the pipe include a method of welding the end of the pipe 30 and the fitting 31 all around or by spot welding (FIG. 6), Penetrating and tightening method (Fig. 7), press pipe 3
A method of partially caulking 0 (Fig. 8) is known.

However, in all of these methods, the joint hardware 31 is fixed to the pipe 30, so if the joint hardware 31 is twisted with respect to each other in the axial direction, a tensile force in the opposite direction is applied to the inner joint hardware 31. In such a case, torsional stress may be generated in the fixed portion of the joint hardware 31 to the pipe 30, and there is a risk that the fixed portion may be damaged. Furthermore, when connecting both joint hardware 31 to other fixed hardware, there is a problem in that the work becomes difficult.

For this reason, methods such as ball joint joints that allow the joint hardware and pipe to move freely have been considered, but they are complicated in structure and have drawbacks in terms of cost.

The present invention was proposed as a result of studies to solve these problems.

(Means for Solving the Problems) That is, the present invention consists of a joint hardware 1 and a pipe 2 into which the joint hardware 1 is inserted, and a throttle groove 3° 4 is formed in the circumferential direction of the joint hardware 1 and the pipe 2. , and these aperture grooves 3 and 4 are fitted together so as to be rotatable with each other. In addition, in order to process such a structure, the pipe 2 is supported on the pipe rotation roll 9, and the fitting hardware 1 is inserted and supported in the pipe by a positioning metal fitting 19, and these pipes 2 and the fitting fitting 1 are connected. The grooves 3 and 4 are formed by simultaneously squeezing the pipe 2 and the fitting l from the surface of the pipe 2 by a roller 17 that can be rotated coaxially and pressurized in the axial direction of the pipe 2.

(Function) The joint hardware 1 and the pipe 2 are fitted with each other in their throttle grooves 3.4, and the joint hardware 1 is connected to the pipe 2 so as to be rotatable in the axial direction. In addition, since the two are connected by drawing, sufficient tensile strength can be obtained at the connected portion.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5. First, in FIG. 1, 1 is a joint hardware, and 2 is a metal pipe.

The fitting hardware 1 is fitted 1! &5 and a handle part 6, a connecting bottle insertion hole 7 is bored in the handle part 6, and a fitting part 5 is inserted into the end of the pipe 2. A throttle groove 4 is formed in the fitting portion 5 in the circumferential direction, and is rotatably fitted into the throttle groove 3 projecting in the circumferential direction of the inner surface of the pipe 2.

Figures 2 to 4 show an example of the equipment used when processing the above-mentioned joint structure.
A pair of left and right pipe rotating rollers 9.9 as shown in FIG. 3 are provided at both ends in the length direction. The rollers are interlocked by a drive shaft 20 shown in Figure 1, and a receiving roller 10 is provided at the intermediate portion.

The pipe rotation rollers 9, 9 are sprockets) 11,
11, the rack is rotated in conjunction with a chain 13, a geared motor 14, and a chain 12 connecting the motor 14 and one sprocket 11. Further, a hydraulic cylinder 16 is installed by an arm 15 above the intermediate portion of the pipe rotation roller 9.9, and a squeezing roller 17 is provided at the tip of this hydraulic cylinder 16.

In FIG. 4, reference numeral 18 denotes a positioning metal for the joint hardware 1 rotatably attached to the guide 19. It is convenient if this positioning hardware 18 is of an attachment type depending on the joint hardware l.

Next, a processing method using the above-mentioned apparatus will be described. First, the metal pipe 2 is placed between the rollers 9 at both ends in the length direction of the frame. At this time, the pipe 2 is located between the left and right rollers 9.9 as shown in FIG. 3, and the intermediate support is pressed by the roller 1O, and the pipe ends are pressed by the left and right rollers 9.9. After that, the fitting hardware 1 is inserted into both ends of the pipe 2, and the pin 21 is inserted into the pin insertion hole 7, for example.
The pipe 2 and the fitting fitting 1 are rotated by driving the motor 14 and rotating the rollers 9.9. . Then, when the hydraulic cylinder 16 is lowered in this state and the pressure is reduced at a predetermined pressure, the rotating pipe 2 and the fitting hardware 1 are squeezed by the squeezing roller 17, and the above-mentioned squeezing grooves 3 and 4 are formed in the entire circumferential direction. become. When the pipe is narrowed, tension is generated in the pipe, and the bend in the pipe is corrected.

The present inventor investigated the tensile strength of a joint structure processed using the method and apparatus described above, and the zero conditions and test results are as follows.

[Conditions] Pipe outer diameter: 34-layer fat plate thickness: 1, 21 joint hardware: Pipe insertion length 40 mm Squeezing roll width: R4 As described above, the joint structure according to the present invention had extremely high tensile strength.

The present invention as described above is applied to, for example, a coupling mechanism between a trailer and a tractor. That is, as shown in FIG. 5, the fitting 1 is connected to the end of the pipe 2 connected to the trailer side by the method described above, and the handle pin insertion hole 7 of the fitting 1 is connected to the coupler 25 on the tractor side. It is connected by pins. With this structure, pipe 2
can be turned in the left-right direction at the pin 26, and since the joint hardware 1 is rotatable with respect to the pipe 2, it can be turned in the axial direction. Therefore, it is possible to freely respond to the movement of the trailer.

In addition to this, the present invention can be applied to a variety of other applications as a pipe joint that requires mutual rotation of pipes. For example, use of architectural scaffolding in industrial areas (tower scaffolding, etc.), use in agricultural pipe-shaped vinyl I\us, pipe-shaped garages, steel pipe construction, pipe-shaped electrodes in electrostatic precipitators. Possible uses include plate hammering beam attachment structure.

The above-mentioned joint hardware 1 is not limited to what is shown in the drawings, but may be one in which one handle is large, one in the form of two prongs, or even a regular pipe.

(Effects) According to the present invention described above, since the joint hardware can be rotated with respect to the pipe, twisting occurring in the joint hardware can be absorbed, and the centering of the joint hardware at both ends can be accurately performed. Furthermore, compared to conventional universal joints, the structure is simpler and it can be easily processed by drawing.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional schematic diagram showing the joint structure of the present invention;
The figure is an overall schematic diagram of the apparatus for implementing the method of the present invention, Figure 3 is a side view of Figure 2, Figure 4 is a partially enlarged view, and Figure 5 is a case in which the joint structure of the present invention is applied to a coupling mechanism. Schematic diagram of
Figures 6, 7, and 8 are schematic diagrams showing conventional joint structures, in which (a) is a front view, (b) is a side view of Mi4 island, 1 is a joint hardware, and 2 is a pipe. , 3.4 are aperture grooves.

Claims (3)

[Claims] (1) Consisting of a fitting hardware and a pipe into which the fitting hardware is inserted, a throttle groove is formed in the circumferential direction of the fitting hardware and the pipe, and these throttle grooves are fitted together so that they can rotate with each other. A pipe joint structure characterized by: (2) With the fitting hardware inserted into the pipe, rotate the pipe and fitting hardware coaxially, and use a pressure roller to simultaneously squeeze the pipe and fitting hardware from the pipe surface to form a groove in the entire circumferential direction. A method for processing pipe fittings characterized by the following. (3) A pipe joint processing device comprising a roll for rotating the pipe, a squeezing roller capable of applying pressure in the axial direction of the pipe, and a support member that supports the joint hardware so as to be coaxial with the pipe.