JP2017221949A - Pipe welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe welding device capable of butt welding of two pipes and even V-shaped welding at an accurate angle.SOLUTION: A device body 1 of a pipe welding device 60 is constituted of: a base 2; rotary tables 3 respectively rotatably installed around a pair of adjusting angle fixing screws 2a screwed in by erecting to the base 2; a pair of arm parts 4 provided on the rotary table 3 and projected from both ends of the rotary table 3; and axial screwing parts 6 having female screw holes 8 respectively coaxially bored in the pair of arm parts 4. A shaft part 12 is screwed in the female screw hole 8 so as to be capable of advancing-retreating. A pair of sandwiching heads 30 (40) are installed in mutually opposed inside end parts 12a of the shaft parts 12, and are rotatable around the end parts 12a as a center, and sandwich pipes K1-K2 held in a state of butting in a straight line shape or a V shape with their opposed surfaces 51. A mark 3b indicating a rotation angle of the rotary table 3 is formed on a rotary plate 3a of the rotary table 3 rotating around the adjusting angle fixing screw 2a. An angle scale 2b indicating a rotation angle of the rotary plate 3a is provided around the rotary plate 3a of the base 2.SELECTED DRAWING: Figure 1

Description

  In the present invention, when two pipes are connected in a straight line by welding, the center is easily centered and welded regardless of the thickness and shape of the pipe, or the angle is accurately adjusted when welding to a V-shape. The present invention relates to an apparatus for pipe welding that can be welded.

The welding of two pipes may be performed by butt welding in a straight line or by joining the cut end to a V shape by deciding the weld end obliquely. In the former case, centering work is performed to match the central axes of the two pipes to be connected. Depending on the quality of the centering work, for example, the fluid flowing therethrough is affected. The reliability and life of the product will also be greatly affected.
The centering operation is an operation that requires high level and skill. As shown in the following Patent Document 1 (Japanese Patent Laid-Open No. 7-40084) and Patent Document 2 (Japanese Patent Laid-Open No. 2015-9305), the centering is performed. Dedicated methods and devices for simplifying work have been developed in the past.

  On the other hand, when joining two pipes in a V shape, the welding angle varies depending on the installation location, so there is no V-shaped joining device or the like, and the operator makes an inclined cutting end in contact. The two pipes are held in a V-shape, both are sandwiched with a vise, the angle is confirmed with a ruler, the joint ends are temporarily fixed by spot welding, and then the entire circumference is removed from the vise and welded all around. It was.

Japanese Patent Laid-Open No. 7-40084 Japanese Patent Laying-Open No. 2015-9305

  In the case of butt welding in a straight line, there are dedicated jigs as described above. However, in the case of welding in a V shape, accurate V-shaped welding is difficult only by relying on the skill of the operator. In addition, since it is a dedicated jig even for butt welding in a straight line, it is difficult to handle, and it is difficult for beginners to use it.

  The present invention has been made in order to solve such problems. It is possible to perform butt welding of two pipes in a state where the cores are accurately aligned with one type of pipe welding apparatus, and to obtain an accurate angle. An object of the present invention is to provide a pipe welding apparatus capable of V-shaped welding.

In order to solve the above-described problems, the present invention is configured as follows, for example, as shown in FIGS. That is,
Provided on the turntable 3, the turntable 3 attached so as to rotate around the base 2, a pair of adjustment angle fixing screws 2 a that are erected and screwed up with respect to the base 2, An apparatus main body 1 composed of a pair of arm portions 4 projecting from both ends of the turntable 3 and a shaft screwing portion 6 having a female screw hole 8 formed coaxially in each of the arm portions 4;
A shaft portion 12 screwed into the female screw hole 8 so as to be able to advance and retreat;
The pipes K1 and K2 mounted on the inner ends 12a of the shaft portion 12 facing each other and rotatable around the ends 12a and held in a straight or V-shaped state are opposed to each other. A pair of clamping heads 30 (40) that are clamped at 51,
A mark 3b indicating the rotation angle of the turntable 3 is formed on the rotation plate 3a of the turntable 3 that rotates around the adjustment angle fixing screw 2a.
The pipe welding apparatus 60 is characterized in that an angle scale 2b indicating a rotation angle of the rotary plate 3a is provided around the rotary plate 3a of the base 2.

  According to the present invention, it is possible to perform welding by holding two pipes in a straight state or holding their joint ends in a V shape at an arbitrary angle with one type of apparatus.

It is a front view of one embodiment in the present invention. It is a top view of FIG. It is a right view of FIG. It is a top view at the time of V-shaped joining in FIG. (A) Rear view of round tube clamping head used in the present invention, (b) Bottom view of the same figure, (c) Right side view of the same figure, (d) Front view of the same figure. It is a perspective view of the round tube clamping head used for this invention. (a) It is sectional drawing of a round tube clamping head, and an expanded sectional view of a round enclosure part. It is a front view of the axial part in this invention. (a) Front view of interchangeable square tube clamping head in the present invention, (b) Right side view of the same figure, (c) Bottom view of the same figure.

  Hereinafter, the present invention will be described with reference to the accompanying drawings. A pipe welding apparatus 60 shown in FIG. 1 includes a base 2, a turntable 3 erected on both ends of the base 2, a bifurcated arm portion 4 projecting from the turntable 3, and an arm The apparatus main body 1 is composed of two shaft screwing portions 6 provided coaxially to the portion 4, the two shaft portions 12 and a pair of clamping heads 30 (40).

  The base 2 is provided with circular turntable mounting portions 2c at both ends, a scale plate 2d is installed and fixed on the turntable mounting portion 2c, and the scale plate 2d has both angle scales 2b with reference to zero. The angle is engraved by sorting. And the female screw hole 2e which penetrates the scale plate 2d and the turntable mounting part 2c is screwed in these rotation centers. Further, two legs 2f are screwed to both ends of the lower surface of the base 2 so that they can be removed if necessary.

  In this embodiment, the turntable 3 includes an L-shaped rotating plate 3a and a U-shaped arm plate 3u. Of course, although not shown in the drawing, it is possible to configure both of them integrally. The L-shaped rotating plate 3a is composed of a semicircular rotating portion 3a1 and a T-shaped vertical portion 3a2 standing upright from the rotating portion 3a1, and at the center of the semicircular edge of the rotating portion 3a1. A W-shaped notch (or inscription) is provided, and an angle adjustment mark 3b is provided. And the rotation hole which corresponds to the above-mentioned female screw hole 2e is drilled in the center of the semicircle edge of the rotation part 3a1.

  A U-shaped arm plate 3u is attached to the upper end of the T-shaped vertical portion 3a2. The arm portions 4 at both ends of the arm plate 3u are bifurcated and extend in a bilaterally symmetrical manner in the same direction forming a substantially right angle, and the female screw holes 8 are formed coaxially in the shaft screwed portions 6 at both upper ends thereof. Has been.

  The adjustment angle fixing screw 2a is a normal fastening member in which a male screw is screwed on a screw leg and a head is formed in a hexagon.

There are two types of clamping heads 30 (40), for example, for round tubes Y1 and Y2, and for square tubes Z1 and Z2, and can be selected in accordance with the shape of the tubes K1 and K2. It can be detached from the part 12.
5-7 is a figure which shows the interchangeable round tube clamping head 30 of this invention. The round tube clamping head 30 has a substantially rectangular shape when viewed from the facing surface 51 (that is, the tube contact surface 32), and a round tube V-groove 34 is formed in the longitudinal direction thereof. The opening angle B of the round tube V-groove 34 is 100 ° to 120 °. Each side 39 of the round tube clamping head 30 is edged so as to draw a gentle arc so that a welding torch is inserted when the small-diameter round tube is clamped. In addition, V-shaped narrow grooves 33 are provided at regular intervals in the short direction of the tube contact surface 32.

  A neck portion 31 protrudes from the back surface of the interchangeable round tube clamping head 30. An insertion / removal hole 30a is formed from the back surface, and a ring groove 30b is formed in the inner periphery thereof. The inner diameter of the opening portion 30c outside the ring groove 30b is an intermediate diameter between the insertion / removal hole 30a and the ring groove 30b, and is formed such that the retaining ring 13 described later can be reduced and inserted.

  Next, the configuration of the square tube clamping head 40 will be described with reference to FIG. About the same structure as the round tube clamping head 30, description of the same member is used and is omitted. The square tube clamping head 40 has a substantially circular and substantially flat tube contact surface 42 (that is, the facing surface 51), and the tube contact surface 42 is approximately 90 degrees along a straight line passing through the central portion thereof. From the opening angle C along a straight line passing through the central portion of the tube abutting surface 42 and substantially perpendicular to the narrow-angle V-groove 44 for square tubes. And a wide-angle V-groove 46 for a square tube that is deeper than the narrow-angle V-groove 44 for a square tube. The square tube clamping head 40 having a substantially circular shape and having a groove engraved on the tube contact surface 42 can be manufactured by forging. The structure of the neck portion 41, that is, the structure of the insertion / removal hole 40a, the ring groove 40b, and the opening portion 40c is the same as that of the round tube clamping head 30.

  The shaft portion 12 is a rod-shaped screw member. When the shaft portion 12 is screwed to the shaft screwing portion 6, the end portion 12a on the side facing each other among the end portions is inserted / removed holes 30a (40a). A cylindrical shape (see FIG. 8 (a)) or a substantially hemispherical shape (see FIG. 8 (b)) that fits into the end portion 12a, and an annular retaining ring groove 12b is provided at the root of the end portion 12a. Since the retaining ring 13 needs to expand and contract its outer diameter when the clamping head 30 (40) is inserted into and removed from the end 12a of the shaft portion 12, the diameter of the retaining ring 13 can be expanded and contracted during this insertion and removal. The diameter of the retaining ring groove 12 b is formed smaller than the inner diameter of the C-shaped retaining ring 13, and play is formed inside the retaining ring 13.

  A handle receiving portion 16 is provided at an outer end portion of each shaft portion 12, and a handle 20 is inserted through the through hole formed in each handle receiving portion 16 so as to be slidable. ing.

A method for assembling and using the pipe welding apparatus 60 of the present invention will be described. First, while the handle 20 is rotated clockwise so that the male screw 14 provided on the outer surface of the shaft portion 12 is screwed into the female screw hole 8, the end portion 12a of the shaft portion 12 is completely exposed. Screw.
Next, the C-shaped retaining ring 13 is loosely fitted into the ring groove 30b (40b) of the clamping head 30 (40).
Furthermore, the retaining ring 13 is inserted into the insertion / removal hole 30a (or the insertion / removal hole 40a) of the round tube clamping head 30 (or the square tube clamping head 40), and the retaining ring 13 is inserted into / removed from the ring groove 30b (or ring groove 40b). ) Until it fits.

  At the time of insertion, the outer diameter of the retaining ring 13 is slightly larger than the opening part 30c of the insertion / removal hole 30a, so that the diameter of the retaining ring 13 contracts due to the pressure during insertion and is pushed into the opening part 30c and passes through the opening part 30c. Then, the ring groove 30b is reached, and the retaining ring 13 itself springs and is locked in the ring groove 30b. As described above, the retaining ring groove 12b has a small diameter so that the retaining ring 13 can be contracted.

When the end portion 12a is cylindrical (FIG. 8B), the round tube clamping head 30 (or the square tube clamping head 40) rotates around the shaft portion 12. When the end portion 12a is spherical (FIG. 8A), the round tube clamping head 30 (or the square tube clamping head 40) can rotate and swing around the end portion 12a.
The arm part 4 assembled in this way is attached to the vertical part 3a2 to form one apparatus main body 1, and the other apparatus main body 1 is similarly assembled to prepare a pair of apparatus main bodies 1.

  Then, the scale plates 2d are placed and fixed on the turntable mounting portions 2c at both ends of the base 2, respectively, and then the turntable 3 of the apparatus body 1 is placed thereon, and the adjustment angle fixing screw 2a is used as a base. Screw into the female screw hole 2e of the base 1. The reference 0 of the left and right scale plates 2d matches the center line of the base 2 in the longitudinal direction. The legs 2f are screwed onto the back surface of the base 2, and the pipe welding device 60 is assembled in this way.

As described above, the round tube clamping head 30 and the square tube clamping head 40 can be appropriately replaced by a tube.
When the round tube clamping head 30 (or the square tube clamping head 40) is replaced, when the round tube clamping head 30 (or the square tube clamping head 40) is pulled out of the shaft portion 12, the retaining ring 13 is reversed. It is pulled out from the ring groove 30b by expanding its diameter under the pulling force. Since the inner diameter of the opening 30c is larger than the insertion / removal hole 30a, the difference in diameter from the ring groove 30b is small, and if the retaining ring 13 is slightly expanded, it can be pulled out with a slight resistance.

Next, in the case of butt welding as shown in FIGS. 1 to 3, the adjustment angle fixing screw 2a is loosened so that the mark 3b of the turntable 3 is aligned with the scale 0 of the scale plate 2d to adjust the adjustment angle fixing screw. Tighten 2a.
If the pipes to be connected are round pipes Y1 and Y2, the ends of the pipes are butted together and placed between a pair of left and right round tube clamping heads 30. The round tube clamping head 30 has a round side in the short direction. The handle 20 is brought into contact with the longitudinal direction of the tube side surface substantially perpendicularly so that the center axis CL of the pair of round tube clamping heads 30 is substantially aligned with the diameter axis of the connecting portion of the round tubes Y1 and Y2. To adjust the centering (FIG. 3).

When the round tube clamping head 30 rotates only around the shaft portion 12 at the end portion 12a of the shaft portion 12 as described above, the shaft portion 12 is arranged coaxially, so that they are arranged side by side. Centering can be performed only by adjusting the screwing allowance of the shaft portion 12 of the pipe welding device 60.
When the round tube clamping head 30 rotates and swings at the end portion 12a of the shaft portion 12 as described above, since the shaft portion 12 is coaxially arranged as described above, the round tube clamping head 30 is arranged in parallel. If the screwing allowance of the shaft portion 12 of the pipe welding device 60 is adjusted and tightened, centering can be performed by automatic alignment.

  When centering is completed, the handle 20 is rotated and the round tubes Y1 and Y2 are fixed by the tube clamping head 30. In this state, the entire circumference of the butted ends of the round tubes Y1 and Y2 is temporarily spot welded at predetermined intervals. After connection and temporary connection, the handle 20 is loosened, the round tubes Y1 and Y2 are taken out, and the entire circumference is welded.

  In the case of the square tubes Z1 and Z2, the square tube clamping head 40 is replaced as described above, and the connecting portions of the square tubes Z1 and Z2 are arranged between the pair of left and right square tube clamping heads 40 as described above. Set to. When the square tubes Z1 and Z2 are square in section, a narrow-angle V-groove 44 of approximately 90 degrees of the square tube clamping head 40 is used, and the narrow-angle V-groove 44 is substantially parallel to the longitudinal direction of the side surface of the square tube. Further, they are brought into contact with two opposite corners of the square tubes Z1 and Z2, and are centered and welded in the same manner as described above.

  A wide-angle V-groove 46 of the square tube clamping head 40 is used for the square tubes Z1 and Z2 having a larger number of corners than the quadrangle, and, as described above, is substantially parallel to the longitudinal direction of the side surface of the square tube and the square tubes Z1 and Z2. The handle 20 is rotated so that the center axis CL of the pair of square tube clamping heads 40 is substantially in line with the diagonal axis of the connecting portion of the square tubes Z1 and Z2. Adjust the centering, and then weld.

When the pipes Y1, Y2, Z1, and Z2 are welded into a V shape, the joint ends are cut obliquely. Since the cutting angle of the joining end is usually half of the joining angle, as shown in FIG. 4, the adjustment angle fixing screw 2a is loosened, and the mark 3b of the turntable 3 is graduated on the scale plate 2d (position of the half of the joining angle). The adjustment angle fixing screw 2a is tightened.
Also in this case, the clamping head 30 (40) is installed according to the pipes Y1 and Y2 and Z1 and Z2 to be connected. The tubes Y1, Y2, Z1, and Z2 are protruded inward from the sandwiching head 30, and the handle 20 is rotated and sandwiched and fixed with the joint ends in contact with each other. In this state, it is temporarily fixed by spot welding as described above, and the entire circumference is welded after the nipping is released.

As described above, according to the present invention, when two pipes are connected by welding or the like, the pipes are effectively clamped linearly or linearly, regardless of the pipe shape, length, short diameter, large diameter to small diameter. An apparatus 60 for pipe welding that can be connected in a V shape can be provided.
In addition, it is needless to say that various modifications can be made within a range that can be assumed by those skilled in the art.

  1: device main body, 2: base, 2a: adjustment angle fixing screw, 2b: angle scale, 2c: rotary base mounting portion, 2d: scale plate, 2e: female screw hole, 2f: leg, 3: rotary base, 3a : Rotating plate, 3a1: rotating part, 3a2: vertical part, 3b: mark, 3u: arm plate, 4: arm part, 6: shaft screwing part, 8: female screw hole, 12: shaft part, 12a: end part 12b: retaining ring groove, 13: retaining ring, 14: male screw, 16: handle receiving portion, 20: handle, 30: head for clamping the round tube, 30a: insertion / removal hole, 30b: ring groove, 30c: opening portion , 31: neck, 32: pipe contact surface, 33: narrow groove, 34: round groove V groove, 39: side, 40: square tube clamping head, 40a: insertion / removal hole, 40b: ring groove, 40c: Opening portion, 41: neck: 42: tube contact surface, 44: narrow-angle V-groove for square tube, 46: wide-angle V-groove for square tube, 1: opposing surface, 60: apparatus for pipe welding, B: narrow opening angle for round tube, C: narrow opening angle for square tube, D: wide opening angle for square tube, K1 / K2: pipe, Y1 / Y2: round Tube, Z1 / Z2: Square tube, CL: Central axis.

A method for assembling and using the pipe welding apparatus 60 of the present invention will be described. First, while the handle 20 is rotated clockwise so that the male screw 14 provided on the outer surface of the shaft portion 12 is screwed into the female screw hole 8, the end portion 12a of the shaft portion 12 is completely exposed. Screw.
Next, the C-shaped retaining ring 13 is loosely fitted into the ring groove 30b (40b) of the clamping head 30 (40).
Further, the retaining ring 13 is fitted with the ring groove 30b (or the ring groove 40b) at the end 12a in the insertion / removal hole 30a (or the insertion / removal hole 40a) of the round tube clamping head 30 (or the square tube clamping head 40). Insert until matched.

Claims (1)

A base, a turntable mounted to rotate around a pair of adjustment angle fixing screws that are erected with respect to the base, and are provided on the turntable, from both ends of the turntable An apparatus main body comprising a pair of projecting arm portions and a shaft screwing portion having a female screw hole formed coaxially in each of the arm portions;
A shaft portion screwed into the female screw hole so as to advance and retreat;
A pair of clamps that are mounted on the inner ends of the shafts facing each other, are rotatable about the ends, and are held in a straight or V-shaped butted state with their opposing surfaces. For the head,
A mark indicating the rotation angle of the turntable is formed on the turntable of the turntable that rotates around the adjustment angle fixing screw.
An apparatus for pipe welding, wherein an angle scale indicating a rotation angle of the rotation plate is provided around the rotation plate of the base.

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