JPH01192434A - Joining tool for pipe - Google Patents

Abstract

PURPOSE:To correctly execute the joining of a pipe on a center line by fitting freely rotatably a working die by bulging its tip from the biting surface of a jaw frame part to the jaw frame part of a pair of working dies main body. CONSTITUTION:A wedge type annular gasket 24, C type ring 25 and fitting 27 are inserted into the diameter expanding part 23 of a pipe joint 21. A jaw frame part 5 is then spreaded, an inner peripheral face 6a is abutted to a taper part 22 and after inserting between work levers 1, 1a/b the jaw frame part 5 is closed, then the diameter expanding part 23 is reduced at its diameter and C type ring 25 is bitten on the surface of the pipe 26 and joined. At this time a die 6 is fitted freely rotatably to the jaw frame part 5 and the end face is bulged a little from the biting surface 5a of the jaw frame part 5 by the elastic force of a spring 7. The joining part of the pipe can thus be correctly joined onto the center line.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention involves inserting the end of a pipe into a tapered enlarged diameter portion formed at the end of a pipe joint, etc., and applying pressure from the outer periphery to expand the pipe. The present invention relates to a pipe joining tool used for joining a pipe material and a pipe joint by plastically deforming a diameter portion.

(Prior art) As shown in FIG. 6, a conventional joining tool for pipe materials of this type has a first jaw (31) having a tapered inner peripheral surface to expand the pipe joint (32) in a tapered shape. While grasping the diameter portion (33), the second jaw (34) having an inner circumferential surface with a tapered shape in the opposite direction is closed around the other tube member (35), and then The first jaw (31) and the second!
(34) are brought closer to each other in the axial direction, and a C-shaped jaw (36) is bitten into the tube material (35) by the inner circumferential surface of the second jaw (34). (For example, JP-A-57-14
However, with such conventional devices, the jaws (31) and (34) of the welding tool need to be moved in a complicated manner, which increases the size of the welding tool and makes it difficult to join the pipe materials near the wall. There were problems such as not being able to do so.

Therefore, the present inventors first invented a method for joining pipe materials in which the joined portion of the pipe materials is pressed only in the radial direction by a pair of clamping jaws,
It has already been filed as Japanese Patent Application No. 126703/1983. However, since such a tightening jaw performs its tightening motion in an arc-shaped trajectory centered on the pivot, the side closer to the pivot comes into contact with the pipe material earlier than the side farther from the pivot, which causes problems with relatively small-diameter pipe fittings. It has been found that there is a strong tendency for the pipe joint to be pushed out inside the clamping jaws toward the side farther from the pivot, making it impossible to properly connect the joint and resulting in slightly inferior pressure resistance.

(Problems to be Solved by the Invention) The present invention solves these conventional problems, has a simple structure, and can easily join pipes near walls. The object of this invention is to provide a pipe joining tool that can accurately join on the center line without being pressed outward.

(Means for Solving the Problems) The present invention rotates a half-shaped processing die with tapered inner circumferential surfaces on both sides on a jaw frame portion at the tip of a pair of processing die bodies pivotally connected by a pin. It is characterized in that it is movably fitted and that the end face of each processing die on the forward side farther from the pin is slightly protruded from the bite surface of the jaw frame under the elasticity of a spring.

(Example) Next, an example of the present invention will be described in detail with reference to FIGS. 1, 2, and 3.

(11, (2) are a pair of machining die bodies that are pivotally mounted to the upper and lower ends of a pair of front and back connecting plates (3), (3) with pins (4), (4) for free scissor movement. Dice body fi
The jaw frame parts (5), (5) of l, (2) have half-split processing dies (6), (6a) with tapered inner peripheries and surfaces (6a), (6a) on both sides from the center. 6) is fitted. As shown in Fig. 2, bolts (1
1), the pipe holders Ql and OI are attached to the pipe holders Ql and OI, and the arc-shaped grooves (12) inside the pipe holders have the above-mentioned half-split processing dies (6) stretched over both sides of the periphery of the arc-shaped grooves (12). By fitting the collar plates (13), (13), the processing dies (6), (6) are rotatably supported relative to the jaw frame parts (5), (5). In addition, each jaw frame part (5), (
Temporary springs (7), (7) are inserted into the flat rectangular holes (8) transparently provided from the tip surface of 5), and each leaf spring (7),
The pins (4) of the processing dies (6), (6) are locked by engaging the engagement notches (9), (9) provided on the outer periphery of the processing dies (6), (6). ) of the jaw frame portions (5), (5), the occlusal surfaces (5a), (
It is made to protrude slightly from 5a).

(14) is formed into a 2' crotch part (15), and the above-mentioned connecting plates (3), (3) are attached to the tip of the 2' crotch part (15) with a shaft pin (18), and is re-attached between the 2' crotch parts (15). An operating rod (1a) formed at the base end of the processing die bodies (1) and (2),
This is a gripping rod with (1b) interposed therein. The gripping rod (14)
The operating rod (1a) is operated by a hydraulic cylinder (not shown).
), (1b) and the operating rod (1a).
, (1b) is pushed open, and a pushing rod (16) with a spherical tip is provided for gripping the jaw frame parts (5), (5) of the reprocessing die body (11, (2)). 17) is a leaf spring that keeps the reworked die bodies (1) and (2) in a closed position when no load is applied (operation). An annular gasket (24) with a wedge-shaped cross section and a C-shaped ring (25) are inserted into a tapered part (22) formed at the end of the joint (21) and an enlarged diameter part (23) following the tapered part (22).
This is for inserting the end portion (27) of 26) and plastically deforming this portion to perform the joining as shown in FIG. First, the reprocessing die body +11 and the jaw frame part (ω,
(5) is expanded, and the tapered inner peripheral surface (6a) of one of the half-shaped processing dies (6), (6) fitted in the jaw frame parts (5), (5) is opened. Tapered part (22) of pipe joint (21)
The push rod (
16) and close the jaw frame parts (5) and (5),
The expanded diameter part (23) following the tapered part (22) of the pipe joint (21)
) is radially reduced in diameter and plastically deformed into a tapered shape by the other tapered inner peripheral surface (6a) of the processing dies (6), (6), and at the same time, the C-shaped hinge (25) is (26
) The bonding is performed by biting into the surface of the material. At this time, in the present invention, the processing dies (6), (6) are rotatably fitted into the jaw frames (5), (5), and the processing dies (6), (6) The side end face is a spring (
7), (7) are slightly protruded from the occlusal surfaces (5a), (5a) of the jaw frame parts (5), (5), so that the jaw frame parts (5), ( When tightening 5), process dies (6), (
The front side of 6) is the jaw frame part (5), the occlusal surface (5a) of (5)
, (5a), and there is no inconvenience that the joint part can be pushed out to the front side of the processing die (6), (6) when tightening, and if you continue tightening, the processing die (6)
), (6) rotate against the springs (7), (7) until their tip surfaces are in the same position as the occlusal surfaces (5a), (5a) of the jaw frame parts (5), (5). This allows the tightening work to be performed while the joint is being tightened, and uniform joining can be achieved.

(Effects of the Invention) As is clear from the above description, the present invention is capable of freely rotating a processing die in the jaw frame portion of a pair of processing die bodies by making its tip slightly overhang the bite surface of the jaw frame portion. Since the pipes are fitted, the pipe material etc. will not be pushed outward during tightening, and the joint can be correctly performed on the center line. Further, since the pipe material joining tool of the present invention has a simple and compact structure, it is possible to easily join pipe materials near a wall. Therefore, the present invention completely eliminates the problems of conventional welding tools and greatly contributes to the development of industry.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of the present invention, Fig. 2 is a partially cutaway perspective view of the main part, Fig. 3 is a partially cutaway side view showing the main part enlarged, and Fig. 4. 5 is a partially cutaway front view showing the joined pipe materials, and FIGS. 6 and 7 are cross-sectional views showing the process of joining the pipe materials using a conventional joining tool. . ill, (2): processing die body, (4): pin, (5
): Jaw frame, (5a): Biting surface, (6): Processing die, (6a): Inner peripheral surface, (7): Spring. Patent applicant: Mie Enamel Co., Ltd. Representative: Akira Shima
Tatsu Watama
Figure 1 Figure 2 Figure 5

Claims (1)

[Claims] A pair of processing die bodies (1) are pivotally connected by pins (4).
), rotate the half-shaped processing dies (6), (6) with tapered inner peripheral surfaces (6a), (6a) on both sides, on the jaw frame part (5) at the tip of (2). It can be inserted freely, and the pin (
The end face of each of the processing dies (6), (6) on the front side farther than the jaw frame part (5) is pressed under the spring (7).
5a) A pipe joining tool characterized by slightly overhanging the pipe material.