JPS5870979A - Welding device for steel pipe material - Google Patents

Abstract

PURPOSE:To provide a welding device for steel pipe piles which decreases the eccentric load to be exerted upon an annular track and maintains the parallelism of the annular track upon a groove by constituting said device in such a way that the weight of a welding wire is acted upon the side opposite from a unit containing a welding torch and a wire drum. CONSTITUTION:A torch 51 is directed to the aiming position of a groove 91 where two pieces of steel pipe piles are connected, and while a cable 31 is fed to the torch 51, a frame body 4 is run together with a carriage 6 on an annular track 2. The operator lets off the cable 31 from the body 3 side of the welding machine and puts the same on respective supporting pieces 7 successively. During this time the weight of the cable 31 acts upon the body 4 according to the pieces 71..., but no pieces 71 are projected on the side of the carriage 6 mounted with a unit 5; therefore the greater part of the weight of the cable 31 is exerted upon the side of the body 4 opposite from the carriage 6. Thus the deviated load by the unit 5 is reduced, the oscillation and position deviation of the track 2 are prevented, the parallelism of the track 2 with respect to the groove 91 is maintained and the good welding is accomplished without deviation from the aiming position of the torch 51.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of automatic welding equipment for steel pipe piles.In order to strengthen the ground, short unit steel pipe piles are sequentially welded and driven into longer lengths at pile driving sites. The welding equipment used at this time is, for example, as shown in Fig. 5, a ring rail (2) is removably attached near the upper end of a steel pipe pile (9).
A unit (5) including a welding torch (51) and a welding wire drum mark is movably arranged on the rail (2), and the unit (5) is run on the ring rail (2), Weld the groove (911) between the upper and lower piles.

However, the above welding device does not allow the weight of the unit (5) to act as an eccentric load on the ring rail (2);
Cable c3 connecting unit (5) and welding machine main body
1) Since the unit travels while dragging the cables, the cables are always placed on the unit side.

Cable Gll has a weight of 1 to 2 pieces per 1rrL,
When this winds around the steel pipe multiple times, a large eccentric load acts on the unit (5) side of the ring rail (2), and the ring rail (2)
) wobbled and the distance between the ring track (2) and the groove (91) could not be maintained constant, which caused the problem that the target position of the torch 61) with respect to the groove was incorrect and good welding could not be obtained. .

An object of the present invention is to reduce the eccentric load applied to the ring track by applying the weight of the cable to the opposite side of the unit, and to maintain the parallelism of the ring track to the groove.

The present invention provides an annular track (2) opposite the welding torch truck (6).
), a support stand (7) with wheels is disposed so as to be movable on a ring rail, and a pair of connecting plates (8) are used to removably connect the support stand (7) and the trolley (6). A frame body (4) surrounding the steel pipe pile (9) is formed, and a cable f31) is attached to the frame body (4).
It features a protruding support piece (7) for hooking the frame (4) to the steel pipe pile (9+) as the trolley (6) runs.
(9a), when the operator rotates the cable Gl+
By hooking the cable (31) onto the support piece (71) of the frame body (4) after unrolling it, the weight of the cable (31) is prevented from being applied only to the unit side as in the past, and the eccentric load acting on the ring track is reduced. It can be reduced.

The present invention will be specifically described below based on embodiments shown in the drawings.

Figure 1 shows two steel pipe piles (
91 (9a) with the welding device (1) attached.

The steel pipe piles (9) (9a) are centrifugally cast, the surface is as-cast, and the lower end surface of the upper steel pipe pile (9) is beveled.

The welding device (1) includes a ring rail (2) installed near the upper end of the lower steel pipe pile (9) and a steel pipe pile (9) mounted on the ring rail (2).
K 9 a') - A frame body (
4) and a welding unit (5) placed on the frame (4)
It consists of

The ring rail (2) has two semicircular rails (2a) equipped with rails (211 (21+) on the upper and lower surfaces and racks @ on the outer periphery).
One end of each of 2b) is fixed with a pivot (c) so that it can be opened and closed, the free ends are brought together to form a perfect circle, and a lever is tightened to form a circular rail that can be opened and closed.

Clamp bolts □□□ are screwed onto the side surface of the ring rail (2) at equal intervals toward the center of the rail, and the tips of the bolts are applied to the steel pipe (9) and the ring rail (2) is grooved (91). It is fixed to the steel pipe (9) in parallel with.

The frame body (4) is a bogie (6) placed oppositely on the ring track (2).
and the support stand (7) are connected by a pair of semicircular connecting plates +8+ +8
1 and are detachably connected.

The bogie (6) and the support platform (7) are formed in a U-shaped cross section so as to straddle the ring rail (2) from the side, and have wheels f621 +621 +η protruding from each other, sandwiching the rail. +621 +721 is freely engaged with 21+ on the upper and lower surfaces of the ring rail (2).

The truck (6) is equipped with a traveling motor hammer) and a pinion (64) rotated by the motor, and the pinion (641) meshes with the rack (a) of the ring track (2).

Furthermore, a welding unit (5) including a welding torch (51) and a welding wire drum 621 is arranged on the truck (6).

The welding machine body (3) is installed on the floor away from the steel pipe (9).
) and the welding unit (5) are connected by a cable Gl+.

The connecting plate (8) of the frame (4) has notched grooves (81) at both ends.
), and the groove (81) is fitted into a thumb screw (82) screwed onto the trolley (6) and support base (7), and by tightening the screw, the trolley (6) and support base (7) are tightened. Fixed.

A supporting piece ('71) for hooking the cable (311) is protrudingly provided at the center of each connecting plate (8) +81 and at the supporting stand (7).

The support piece f711 in the example was made by bending a metal rod into a U-shape and welding it to the connecting plate (8) and the support base (7) with the opening facing upward. However, the shape and locking of the support piece (71) The method is not limited to this, but any method that can be used to hook and receive the welding cable Gll may be used.

The connecting plate (8) has a wheel (831) projecting downward near the support piece 71+ on the chain plate (8), and the wheel (83) is engaged with the rail of the ring track (2).

Thus, the torch 61) is directed toward the target position of the groove (91), and while the welding wire is fed to the torch 61), the trolley (6) and hence the frame body (4) are run on the rail (2).

The operator feeds out the cable (31) from the welding machine main body (3) and passes the hook onto each support piece (71) as shown in FIG. Cable (311 weight is each supporting piece m1 F71
) m) Therefore, it hangs on the frame (4), but the unit (5)
There is no supporting piece protruding from the side of the trolley (6) on which the cable 1311 is mounted, so most of the weight of the cable 1311 is carried by the frame (4).
It hangs on the opposite side of the trolley (6).

That is, since the weight of the cable 1311 acts on the opposite side of the unit (5), the unbalanced load due to the unit (5) can be reduced, and an unbalanced load greater than the unbalanced load due to the unit (5) can be applied to the ring track (2). There isn't.

This prevents runout and misalignment of the ring track, and prevents the bevel (9
By maintaining the parallelism of the rail (2) to (1), good welding can be achieved without losing the target position of the torch.

In addition, since a wheel shaft σ2 that engages with the rail (2) is provided near each support piece (71), the frame (4) itself does not swing under the weight of the cable (31) or the carriage (6) ) and the wheels (62) of the support stand (7), and the frame (4) can rotate smoothly.

By passing the cable C31+ around the frame (4), the cable Gll will not be wrapped around the steel pipe (9) (
Therefore, unlike in the past, it is possible to prevent the cable (31) from strongly rubbing against the cast surface of the steel pipe and damaging the cable strike, and furthermore, since the frictional resistance between the cable and the steel pipe can be almost ignored, it does not interfere with the running of the bogie. Must not be.

If the frame (4) rotates the steel pipe (9) 3 to 4 times, the motor (
- is reversed to run the frame body (4) in the opposite direction, and after returning it to its original position, welding to the groove (9) is continued.

At this time, the operator can simply pull the cable (31) from the frame (4), repeat the above operation, fill the groove with the weld bead, and complete the welding.

FIG. 4 shows another embodiment in which the support piece (7I) is provided protruding only from the support base (7), and in this case also, the support piece σ1)
By passing the cable (31) to the unit (5
) can reduce the unbalanced load on the ring track (2).

In addition, when implementing the present invention, the welding torch (61) and the welding wire drum @ are not combined into one unit, but the welding torch (51) is placed on the trolley (6) and the wire drum (521) is placed on the support stand (7). It is also possible to eliminate the unbalanced load acting on the ring rail (2).

As described above, the present invention provides a frame body (
4) Pass the cable (31) to the support piece (711),
The weight of the cable can reduce the unbalanced load on the torch trolley (6), suppress the occurrence of positional deviation due to runout between the ring and the rail, and maintain the parallelism of the rail (2) to the groove, thereby improving the torch's target position. Good welding can be performed without the parts coming off.

Furthermore, since the cable (31) can be prevented from winding around the steel pipe (9), there are many excellent effects such as no damage to the cable due to friction between the cable and the steel pipe, and no interference with the running of the truck.

It goes without saying that the present invention is not limited to the above configuration, and that various modifications can be made within the technical scope of the claims.

[Brief explanation of the drawing]

Figure 1 is a front view of the state in which the welding equipment is installed, and Figure 2 is a front view of the state in which the welding equipment is installed.
3 is a front view of a state in which the cable is hung and passed, FIG. 4 is a front view of another embodiment, and FIG. 5 is a front view of a conventional example. (2)...Ring track l31)...Cable (4)...Frame body (6)...Bogie (7)
... Support stand (71) ... Support piece (8) ...
・Connection plate

Claims (1)

[Scope of Claims] ■ In a welding device that butt-welds two steel pipe piles by automatically running a welding torch along a ring track installed at the end of a steel pipe pile, the welding torch is mounted on a cart mounted on a welding device. , A support stand with wheels is installed on the ring rail at a symmetrical position of the bogie halfway around the ring rail, and the support stand and the bogie are removably connected with a pair of connecting plates to attach the steel pipe pile. A steel pipe pile welding device that forms a frame that goes around the frame, and has one or more supporting pieces protruding from the frame for hooking a cable that connects a truck and a welding machine main body. (2) The steel pipe pile welding device according to claim 1, wherein support pieces are provided protruding from the substantially central portion of each connecting plate and the support base, respectively. (2) The steel pipe pile welding device according to claim 2, wherein the connecting plate is provided with a wheel that engages with the ring rail near the supporting piece on the connecting plate.