JPS5930487A - Continuous tack welding device for straight seam welded steel pipe - Google Patents

Abstract

PURPOSE:To perform continuous tack welding at a high speed with good efficiency, by constituting an upper clamping body of a pair of light and left opening/closing type clamps which are separated at the center and opening successively the same when a welding head moves to approach the clamps. CONSTITUTION:A pipe P which is loaded in a machine frame 1 is so seamed that an open seam part P1 is positioned right above. A bolster 4 moves upward to lift the pipe P with a lower clamping body, thereby sandwiching the pipe between the same and an upper clamping body 6. When a welding head 13 moves to approach the position of the body 6, right and left opening/closing clamps 7, 8 open successively at the gap G that permits the movement and passage of the head 13 to permit continuous tack welding. The pipe P subjected to the tack welding is unloaded on conveyance rolls as the bolster 4 descends, and is discharged to the outside of the frame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves clamping an open seam pipe between upper and lower clamp bodies, and continuously tacking the seam butt part by moving the welding head with the open seam part on top. This invention relates to a continuous tack welding device for straight seam welded steel pipes.

, ()L/-) Seam welded steel pipes are cleaned, dried, and then transported and loaded into a temporary welding device where the open seam part is welded, and then this pipe is transferred to the next process. The tack welding process is carried out by performing the final welding of the welded parts, and the conventional tack welding equipment used in this manufacturing process was constructed as follows.

In other words, the temporary welding device of Sorai is equipped with a plurality of upper clamp bodies and a lower clamp body that clamp the oron seam pipe inserted into the machine frame, and the upper and lower flange bodies of the machine are used to weld seams. The welding head is configured to hold the pipe and intermittently perform temporary welding on the seam abutting part with the welding head in a butt state where the open seam part is in two.

However, this upper and lower flang type tack welding device has the excellent advantage of having a large effect of correcting the offset of the seam entry part and good adhesion of the abutting part, but the upper clamp body is attached to the welding moving part of the welding head. It's not good to be located,
This tack welding due to the movement of the welding head is a disadvantage in that it is not possible to weld intermittently (avoiding the position of the upper clamp body, potholes, seams) continuous welding of defective lengths, and efficiently at high speed. There is.

The purpose of this invention is to take advantage of the advantages of the above-mentioned conventional device and eliminate its drawbacks, that is, to achieve both countermeasures against seam offset by upper and lower clamps and speeding up of welding by continuous tacking. - The upper clamp body is composed of a pair of left and right open/close type clamps separated in the center, and when the welding head approaches this clamp position, the clamps are sequentially opened at intervals that allow the head to pass through. The special feature of temporary welding is that it allows welding to be carried out efficiently at high speed.

Hereinafter, an actual MII example of this inventive device will be described in detail with reference to the drawings. In the figure, 1 is a frame-like frame cylinder 3 into which an open seam P iso P is loaded by a conveyor roll 2, and is horizontally raised and lowered. Delstar 4 is installed. Reference numeral 5 designates a plurality of lower clamp bodies that are replaceably attached to the sr and Leicester 4 at appropriate intervals in the pipe charging direction, and each of the lower clamp bodies corresponds to the diameter size of the knob P. It is composed of a plate-shaped body having a tube-clamping surface 5a with a radius of curvature suitable for
Fixing means that should be fitted and illustrated as shown in the diagram (for example, bolts, etc.)
It can be removed removably. Note that when the pipe P is fed into the machine frame 1, this lower clamp body 5 is recessed into the lower side of the upper surface of the conveyor roll 2 due to the descent of the del star 4, and after the pipe P is introduced into the machine frame 1. The pipe 1 is raised together with the bolster 4 by the operation of the clamp cylinder 3 in order to clamp the pipe 1 between the upper clamp members 6 (a plurality of which are arranged at appropriate intervals in the pipe insertion direction). To this end, the bolster 4 is provided with a frame hole (not shown) at a position corresponding to the arrangement portion of the transport roll 2, which allows the roll to be raised and lowered upwardly and downwardly.

Each of the above upper clamp bodies 6 (in the conventional case, the above) e
(It was composed of an integrated plate-shaped body with a tube-closing and clamping surface with a radius of curvature that matched the diameter size of Eve P) was composed of a pair of left and right open/close clamps 7.8 separated at the center. . The left and right opening/closing cranks 7''7, 8 are pivoted to the upper frame t't111a of the machine frame 1 by pins 7a, 8a, and the opening/closing cylinders 7b, 8b are connected to the bin branch as a fulcrum.
Master plates 7c, 8c are rotated 1til in the vertical direction by the operation of
Pipe contact plate 7 (removably) attached to c.
! , Be, and this opening/closing clan ′j′y p
The closed state of s is maintained by upper clamps 11 and 11 and 12 which are slid open and closed by horizontal operating cylinders 9 and 10 (see FIGS. 2 and 3). Then, when the welding spatula l#J moves toward the clamp ( The clamps are opened sequentially at intervals G that allow passage, but this is done by detecting the moving approach of the head 13 with a sensor (not shown), and using the detection signal to move the cylinders 9 and 10 backward. After sliding open the upper flange stoppers II and 12, the clamp opening/closing cylinder 7b,
8b is activated, opening and closing the left and right clangers.

8 is rotated upward and opened. In order to improve efficiency, the welding head 13 is multi-headed as shown in Figure 1, and each head divides the welding length and tack welds the pipe seam pz continuously at high speed at the same time. Go.

Next, the procedure for using the inventive device h', which has been completed as described above, will be explained.

(1) Open sheet after forming, Aia'
After cleaning and drying, P is loaded into the tack welding apparatus (inside the machine frame 1), which is the subject of this invention, using a conveyor roll 2.At this time, the lower clamp body 5t'', the conveyor roll The opening/closing clamps 7.8 constituting the J-Cranzo body 6 are closed as shown by solid lines in FIG.

(2) The seam P loaded into the machine frame 1 is detected by an automatic seam detector and turning device (directly (reference numeral 14 shown in Fig. 1)) to an open seam i' ((P 1 is directly above The seams are aligned so that

(3) Next, the bolster 4 is connected to the clamp cylinder 9-
3, the lower clamp body 5 lifts the above-mentioned Noe4 P horizontally and clamps it between it and the upper clamp body 6 (
(Situation shown in Figure 3). At this time, the seam offset P2 of the open seam #ear'P is as shown in Fig. 4 (4), (
As shown in B), the curved surface rtl of the upper clamp 3 body 6 (opening/closing clamp 7.8)! 7 d and 8 d are pressed and corrected. In other words, even if the upper clamp buoy and toro are configured with a pair of left and right opening/closing clamps 7.8, the same effect as in the case of the conventional upper and lower clamp method can be achieved, but the seam offset correction effect is large and the seam abutment has good adhesion. 75.
(can.

(4) The welding head 13 moves along the seam portion Pit/L2 and performs continuous tack welding.

At this time, when the head 13 moves close to the position of the upper clamp body 6, the left and right opening/closing clamps 7.8
sequentially open at intervals G that allow the movement of
10 welding is possible.

(5) In the temporary attachment, the pipe P which has been welded is lowered onto the υ transport roll 2 by the descent of the del star 4, and carried out of the machine frame 1 by the roll.

FIG. 5(B) is an explanatory diagram showing a method of rearranging the lower clamp body 50 when changing the size of the pipe P, and shows a pipe with a different radius of curvature with the lower clamp body 5 completely removed. The lower clamp body 5' having the clamping surface 5a' is pulled out and removed downward from the rearrangement trolley 15, and is locked and mounted on the recombination trolley 15, and is moved into the machine frame 1 along the rail 16. . Next, the bolster 4 is raised by the operation of the clamp cylinder 3, and the lower clamp bodies 5' loaded on the trolley are sequentially added to the del star 4. Thereafter, the 15 carts are moved outside the frame 1. In addition, when recombining the upper flange body 60, the tube contact plate 7e, /
? This is done by replacing only e using a crane or the like.

The tack welding device of the present invention is as described above, and the upper clamp body is composed of a pair of left and right opening/closing clamps separated at the center, and as the welding head moves closer, it prevents the welding head from moving and passing. Since they are opened sequentially at the allowable intervals, it is possible to correct the seam offset, which is an advantage of the conventional upper and lower clamp method, while eliminating the disadvantage of intermittent tack welding. However, the entire length of the seam can be welded continuously and efficiently by moving the welding head.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of this invention device.
Figure 2 is a perspective view of the clasp section showing the upper clamp body (opening/closing clamp) of the device being opened in sequence, and Figure 3 is a perspective view of the upper clamp body (opening/closing clamp).
Figure 4 (A), (B)
5A and 5B are explanatory diagrams showing a method of rearranging the lower clamp bodies. P...Open seam part or eve, Pl...Open seam part, 1...Machine frame, 2...Transportation roll, 3...
・Clamp cylinder, 4... Bolster 15...
Lower clamp body, 6..." Lower clamp body, 7t8...
Opening/closing clamp, 13...Welding head. Applicant's agent Patent attorney Takehiko Suzue j9-3 Figure 6 Figure 4 (A) (B) 418- Figure 5 (A) (B)

Claims (1)

[Claims] The open seam pipe loaded into the machine frame is clamped between multiple upper flang bodies and lower clamp bodies 6, and with the open seam section facing upward, the joint seam butt section is temporarily welded using a welding head. In a device in which the attachment is in contact with the bath, each of the above upper clamp bodies is composed of a pair of left and right open/close flangs separated at the center, and when the welding head moves close to the flang position, the head can pass through the flangs. A continuous tack welding device for straight room welded steel pipes, which is characterized by successive openings at equal intervals.