JPH0618716Y2 - Welding restraint jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a restraint for welding applied when automatically welding a cylindrical material to be welded, such as a coiled tube formed by spirally forming a thin thin tube. It relates to jigs.

(Prior Art) A conventional example of the jig for welding the coiled tube will be described. As shown in FIGS. 5 and 6, the bottom plate (b ₁ ) and the bottom plate (b ₁ )
Welding jig (b ₂ ) consisting of side plates (b ₂ ) installed upright on the side of ( ₁ ).
_1,2) is used, the bottom plate a coiled Chiyubu (a) (b ₁₎ of the same coiled Chiyubu while placed on against arranged push the side plate (b _2), the bottom plate and (b ₁₎ the side plates ( b ₂ ) keeps the axis of the coiled tube (a) linearly restrained, and temporarily welds (c) as shown on the outside of the circumferential trisecting position between each adjacent tube in the coiled tube. ) To maintain a constant shape, and then main welding is performed.

(Problems to be solved by the invention) In the conventional welding jig, the bottom plate and the side plate support and restrain the lower side and the one side of the coiled tube (cylindrical material to be welded). Since it is a tube, if main welding is performed directly on the outer peripheral side of the coiled tube by automatic welding, gear gaps, steps and welding distortion between the tubes are likely to occur, and the shape is kept constant before the main welding. Therefore, there is a problem in that the tack welding requires time and labor, and the bead widths of the tack welding portions become uneven, resulting in poor appearance.

(Means for Solving Problems) The present invention is a welding restraint jig developed in order to address the above-mentioned problems.
A plurality of restraining members arranged via a jack and moved toward the inner wall of the cylindrical material to be welded by the jack, and attached to both ends of a screw shaft penetrated by the hollow shaft, It consists of a pair of restraining abutting plates that move toward both ends of the cylindrical welded material by an axis, and the ends of each of the restraining abutting members contact the inner wall of a restricted short cylinder provided in the aforesaid restraining abutting plates. By providing a contacting surface and a spring for elastically holding the constraining pad on the screw shaft, the constraining shape retention capability of the cylindrical workpiece can be improved and direct welding of the main welding can be performed. The accuracy and efficiency are improved to solve the above problems.

(Operation) An inner wall restraint is placed inside a cylindrical material to be welded, an end restraint is assembled, and each restraining member disposed on the outer periphery of the hollow shaft of the inner wall restraint is covered by the jacking mechanism. By moving toward the inner wall of the welding material and the contact surfaces of both ends of each restraining member come into contact with the restriction short cylinders provided on the restraining plate, the circular and axial shapes of the cylindrical workpiece are restrained. Aligned, 1 by the screw shaft of the end restraint
The pair of restraining plates move toward both ends of the cylindrical welded material, and the cylindrical welded material is pressed and restrained in the axial direction by the springs provided on the screw shafts to be compressed and restrained. It is possible to directly perform the main welding on the outer peripheral side of the cylindrical material to be welded.

(Embodiment) One embodiment of the present invention is shown in FIG. 1 to FIG.
(a) is, for example, a coil-shaped tube, that is, a material to be welded, which is arranged on the outer periphery of the hollow shaft (1) via the jack (2) and is moved toward the inner wall of the coil-shaped tube (a). An inner wall restraint equipped with a plurality of restraining members (metal fittings) and a screw shaft (11) mounted in both ends of a screw shaft (11) penetrating in the hollow shaft (1) are coiled by the screw shaft (11). The structure is provided with end restraints including a pair of restraining plates (12) that are moved toward both ends of (a).

The inner wall restraint will be described in detail. The jack (2)
Is a pair of link mechanisms (2c, d) pivotally connected between the bracket (2a) at the outer peripheral center of the hollow shaft (1) and the bracket (2b) at the inner center of the restraining member (3). ), And a screw bolt (2f) with a head (2g) screwed and connected between the intermediate pins (2e) and (2e) of both link mechanisms (2c, d) (2c, d). (2
When the screw bolt (2f) is rotated by g), the link mechanism (2f
c, d) (2c, d) relative movement of the intermediate pin (2e) (2e), the restraining member (3) is moved toward the inner wall of the coiled tube (a), the restraining member (3) Are arranged in a plurality (three in the figure) as shown in FIGS.
A pressing surface is formed over the entire inner wall of (a).

The end restraint will be described in detail. Hollow shaft (1)
One of the restraining plates (12) (right side in the figure) is fitted to the base end side of the screw shaft (11) which is inserted through the screw shaft (11) and fixed to the base end of the screw shaft (11). A coil spring (14) is installed between the same (13) and the restraining pad (12), and the other restraining pad (12) (left side in the drawing) is screwed to the tip side of the screw shaft (11) to handle it. When the screw shaft (11) is rotated by (13), the relative distance between both restraining plates (12) and (12) is shortened, and both ends of the coiled tube (a) are pressed and constrained. Together, both restraining abutting discs (12) are formed in a disk shape and have an inclined pressing surface (12a) corresponding to the end shape of the coiled tube (a). ) Coiled tube
A restriction short cylinder (15) fitted to the inner wall of the end of (a) is provided,
A jack driving hole (16) is provided. At both ends of the restraining member (3), abutting surfaces (3a) (3a) abutting against the inner wall surface of the short cylinder (15) are extended.

The embodiment of the present invention is constructed as described above and its operation will be described.

Insert the inner wall restraint into the cylindrical material to be welded, that is, the coiled tube (a), and place one restraining pad (1) on the base side of the screw shaft (11).
2) and attach the screw shaft (11) to the hollow shaft.
The other restraining pad (12) is screwed into the tip of the end restraint, and the end restraint is assembled and arranged.

When the screw bolt (2f) of the inner wall restraint is rotated by the head (2g), the intermediate pin (2e) of the pair of link mechanisms (2c, d) (2c, d) and
The mutual spacing of (2e) is shortened and both link mechanisms are extended in the radial direction, and each restraining member (3) moves toward the inner wall of the coiled tube (a), and almost the entire inner wall is pressed and restrained. Then, when the screw shaft (11) of the end restraint is rotated by the handle (13), the mutual spacing between the two restraining plates (12) and (12) is shortened and both ends of the coiled tube (a) are reduced. The restriction (3a) (3a) provided on both ends of each restraining member (3) of the inner wall restraint is provided on both restraining plates (12) (12). By contacting the inner surface of the short cylinder (15), the inner wall of the coil-shaped tube (a) is pressed and restrained over almost the entire area to maintain the shape, and a pair of restraining plates (12) of the end restraints are provided. ) (12) and the coil spring (14) provided on the screw shaft (11) presses and constrains both ends of the coiled tube (a), compressing the coiled tube (a) between the tubes. It disappears restraining the shape retaining performance such Yatsupu and steps can be enhanced significantly. Therefore, when the coil-shaped tube, that is, the cylindrical material to be welded (a) is held by the restraining jig for welding to retain the shape, it becomes possible to directly perform the main welding on the outer peripheral side without tack welding. The welding accuracy and efficiency are significantly improved.

After welding, rotate the screw shaft (11) in the reverse direction and remove the restraining pad (12) screwed to the tip side of the screw shaft (11) and pull it out from the hollow shaft (1). Patch member
(5) is retracted to the side of the hollow shaft (1), and the coiled tube which has been welded, that is, the cylindrical material to be welded is easily released.

Since each restraining member (3) is supported by a pair of link mechanisms (2c, d), one-sided contact with the inner wall of the cylindrical material to be welded is eliminated and the base end of the screw shaft (11) is eliminated. Since the restraining pad (12) fitted on the side is supported by the coil springs (14), the restraining force applied to both ends of the cylindrical workpiece (a) by both restraining pads (12) is buffered. The shape retention performance and reliability of the cylindrical material to be welded are significantly improved.

(Effects of the Invention) As described above, according to the present invention, a plurality of restraining members that are arranged on the outer periphery of the hollow shaft through the jack and are moved toward the inner wall of the cylindrical workpiece by the jack and the hollow member. Since it is attached to both ends of a screw shaft penetrated through the shaft, and is composed of a pair of constraining abutting plates that move toward both ends of the cylindrical member to be welded by the screw shaft,
The cylindrical welded material has its inner wall constrained and shaped by the movement of each restraining member, and its both ends can be compressed and shaped by the movement of a pair of restraining plates. , The contact surface provided at the end of the cylinder is brought into contact with the inner wall of the regulated short cylinder provided on the restraining plate, so that even in the case of a cylindrical material to be welded, which has a particularly small wall thickness, the cylinder does not have to be expanded without overloading. It becomes easy to maintain the specified dimensions of
In addition, since the compressing force is applied by the spring to the restraining pad, there is no gap in the groove due to the contraction of the cylindrical material to be welded during welding, so there is no trouble such as molten metal burnout during welding and welding is possible. Has the effect of being smoothly performed

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention in a partial cross section,
2 is an end view of FIG. 1, FIG. 3 is a side view of the inner wall restraint, FIG. 4 is an end view of FIG. 3, FIG. 5 is a side view showing a conventional example, and FIG. It is an end view of a figure. 1: Hollow shaft, 2: Jacking 3: Restraint member, 11: Screw shaft 12: Restraint plate, 3a: For the time being, 15: Regulated short cylinder

Claims (1)

[Scope of utility model registration request] 1. A plurality of restraining abutting members which are arranged on the outer periphery of a hollow shaft through a jack and which are moved toward the inner wall of a cylindrical material to be welded by the jack, and which are penetrated into the hollow shaft. The restraining pad is mounted on both end portions of the screw shaft, and comprises a pair of restraining pad plates that move toward both end portions of the cylindrical material to be welded by the screw shaft. A restraining jig for welding, characterized in that a contacting surface is provided for contacting an inner wall of a regulating short cylinder provided on the board, and a spring for elastically holding the restraining pad is provided on the screw shaft.