JPS60199592A - Hydraulic clamp for welding of pipes - Google Patents

Abstract

PURPOSE:To form a weld zone having good quality with excellent workability in the stage of welding pipe materials to each other by centering and holding the ends of both pipes to be welded by means of a hydraulic clamp and press- welding the pipes by hydraulic cylinders thereby welding the pipes. CONSTITUTION:A hydraulic clamp body A is fixed to the groove 1 for welding of metallic pipes P1, P2 to be welded by means of a latch fastener 2 along the groove face of the pipe P1. The top ends of the separating fittings 3 of the clamp A are projected to the peripheral surface of the other pipe P2 and the weld zone 5 is matched and centered by means of set bolts 4. The body A is installed with >=1 pieces of arms 6 in parallel with the axial line of the pipe P1 freely movably forward and backward on the peripheral surface at the pipe P2 end. The bevel edges of both pipes P1, P2 are brought into press contact with each other by hydraulic joining arms B which drive the arms 6 by means of hydraulic cylinders 7 and are welded by gas welding, etc. by which the weld zone 5 having good quality is formed with the simple operation.

Description

[Detailed description of the invention] Currently, when butt welding pipe ends together, mainly in piping work for pipelines, plants, etc., both pipe ends are clamped and the welded part (butt groove surface of both pipes) is used. Various types of clamps are used to align, center, and securely maintain this state.

As shown in the figure, one example of the clamp is a clamp main body A (illustrated example) that is hooked and rotated along the beveled surface of the end of the pipe P1 to be welded, and then tightened appropriately using a tool. like 2
There are fixed-shaped ponds that hold split rings, and chain-shaped ponds. ), the guide fittings 3 (in the illustrated example, removable separate guide fittings 3) are installed at intervals, and the welded part S is accurately aligned by adjusting the screw advance and retreat of the cent bolt ≠ screwed onto the tip of the guide fittings 3. Then, align the center, and in this aligned state, temporarily weld several parts of the welding part, or perform TlG welding (tungsten inert gas welding) while first removing the separate guide fitting 3, and then This involves removing the clamp and officially welding the entire circumference.

The present invention provides, in the pipe welding clamp described above, a hydraulic clamp C that is provided so that alignment and centering adjustment of both pipe welded parts S is performed by a hydraulic cylinder, and a hydraulic clamp C that is attached to a clamp body A.
is additionally configured with a hydraulic connecting arm B which adjusts the root gap between the two pipes P1 and P2 and maintains pressure contact or continuous pressure contact force by moving forward and backward in a freely adjustable manner using a hydraulic cylinder. These various welding preparation operations can be performed accurately, quickly, and easily by operating them simultaneously or alternately, thereby making welding operations particularly at construction sites extremely efficient.

That is, to explain the configuration of the present invention with reference to its embodiments, it is a separate guide fitting with a clamp body AK attached, which is hooked and rotated along the groove surface of the pipe pi, and is tightened appropriately using a tool. 3. A clamp for welding pipes in which alignment and centering of the welded part S is performed by adjusting the screwing forward and backward movement of a set bolt V which is screwed onto the tip and whose tip protrudes to an appropriate size above the circumferential surface of the pipe end of the counterpart pipe P2, Clamp body A fixed to the end of pipe P1 has one or more
An arm 6 is appropriately installed parallel to the axis of the pipe P1 on the end surface of the mating pipe P2 so that it can be adjusted forward and backward by a set dimension, and the driving force of the arm 6 is connected to the arm 6 as appropriate. At the same time, one or more hydraulic joints 7-m B are provided, and each 7-m 6 of each hydraulic joint 7-m B is provided.
At the tip, a hydraulic clamp Ct is provided with a hydraulic cylinder G whose cylinder axis itself can be adjusted vertically and as a ramp 9, with its axis directed toward the center point of the pipe P2. are connected as appropriate.

One or more of the above-mentioned hydraulic joint arms B are installed mainly at symmetrical positions on the left and right sides of the pipe P1 depending on the size of the pipe diameter, etc., and each 61 arms are connected directly or directly to the hydraulic/cylinder 7. Although it may be provided in an indirect connection configuration, as shown in the illustrated example, the tip of the shaft 12 of one hydraulic cylinder 7 and the rear end of the arm 6.6 are connected by a rod 13 as a set of 62 arms. It is also possible to provide two terminals 6.6 so that they work together.

The end member 6 is most simply made of a round bar and is slidably inserted into the through hole 1 on the side surface of the clamp body A.

Hydraulic clamp C has vertical movement adjustment for adjusting the alignment and centering by clamping the pipe P2 by clamping the shaft itself of the hydraulic cylinder g suitably attached to the tip of pipe P2 for each individual pipe 6. It is used as a swivel lamp 9, and a suitably shaped nut 13 is attached to the tip of the shaft (ie, clamp q) as necessary.

In addition, the bolt is a fixing bolt provided on a part of the clamp body A, and after fixing the clamp body A to the pipe PI,
Further, by tightening the poles)/&, the clamp body A is firmly fixed and prevented from shifting laterally.

Each hydraulic cylinder 7 of each hydraulic joint arm B and each hydraulic cylinder of each hydraulic clamp C provided as described above has a hydraulic pipe/o, respectively.

The hydraulic cylinders are appropriately connected and piped so that each hydraulic cylinder can be controlled and driven individually or simultaneously by automatic control using, for example, a microcomputer.

In the above configuration, an example of the welding work order using the hydraulic pipe welding clamp of the present invention and its features are as follows.

l)...In the case of general butt welding of straight pipes to straight pipes (a
)...First, the two-piece clamp body A is fitted onto the end of the pipe P1 close to the bevel surface l, and is properly secured with a fastener.

(b)...Next, tighten the fixing bolt /& of the clamp body A to firmly fix it to the pipe PI and prevent it from shifting laterally.

(c)...Next, the groove surface l of the mating pipe P2 approaches or contacts the groove surface / of the pipe pi, and the abutting groove surfaces (i.e., the welded part S) of both tubes are aligned and centered. I do.

The alignment and centering work is performed using the conventional separate guide fittings 3.
and by operating the hydraulic clamp C of the present invention, respectively. That is,
For example, each hydraulic clamp C at the end of each hydraulic joint arm B
The hydraulic cylinder t is adjusted vertically, and the clamps 9 are powerfully and finely moved up and down using the powerful hydraulic driving force to accurately align and center both pipe ends, and the adjustment position is adjusted to seven positions ( This is done by screwing the set bolt t of the rate guide fitting 3 back and forth and tightening it to hold it.

(d)...The hydraulic joining arm B1 of the present invention is used to perform an operation to maintain a constant root gap between the two pipe ends that have been aligned and centered.

That is, by powerful fine adjustment of the hydraulic cylinder 7, each 7-m 6 is moved forward and backward, and the end of the pipe P2 is pulled toward and returned to the end of the pipe P1, so that the root gap is maintained at a constant K11ll1 knot.

It is completely arbitrary whether the alignment and centering operations and the root gap adjustment operations are performed simultaneously or alternately.

(e)...As mentioned above, once alignment, centering, and adjustment of the root gap, etc., are completed, tack welding or TIG welding of the first layer is performed. In the case of TIG welding, During welding, the hydraulic clamp C and the hydraulic joining arm B are moved back to release the hydraulic clamp 9, and the end arm 6 is moved to a position where it does not interfere with the welding work (see illustration). The welding work can be easily performed by retreating to a line position of 1 it.

Further, at this time, the separate guide fittings 3 can also be sequentially removed or shifted.

n) In the case of deformed welding For example, in the case of welding a straight pipe and a curved pipe, each curved pipe, a straight pipe or a curved pipe and a head plate, VC is as shown in Figure 2 (straight pipe P1 and head plate P4). )
As shown in Fig. 3 (straight pipe P1 and curved pipe P3), the shape of the tip of the separate guide fitting (or normal guide fitting) 3 and the shape of the knee tS of the clamp tip of the hydraulic clamp B, etc. If one that is deformed to suit the surface of the object is used, similar welding can be efficiently performed by the same operations as described above without any problems as in the case of the above-mentioned straight pipes.

■)...In the case of gas welding As mentioned above, according to the present invention, the mating pipe P2 is strongly clamped with the hydraulic clamp C for alignment and centering, and at the same time, the hydraulic By operating the joint r-me B, the pipe P2 can be freely driven forward and backward toward the pipe p+, and the root gap can be freely set. Since the welding state can be maintained or the welding state can be continued with a constant pressure welding force, it is possible to weld while applying a constant welding pressure to the welded part, especially in the case of main welding of gas welding. It has the advantage of being able to perform excellent welding.

In the above case, in order to make the pulling action of the hydraulic joint arm B effective, it is desirable that the clamping state of the pipe P2 by the hydraulic clamp C and the separate guide fitting 3 is strong. It is more appropriate to form the area of the bolt ≠ tip and the shoe/3 of the clamp 9 to be wide as shown in the illustrated example (FIG. 4).

[Brief explanation of the drawing]

Fig. 1 is a front view and a side view of a case in which straight pipes are welded together using an apparatus according to an embodiment of the present invention, Fig. 2 is a front view in the case of welding a straight pipe and a head plate, and Fig. 3 is the same. FIG. 4 is a front view when welding a straight pipe and a curved pipe, and FIG. 4 is a front view when welding straight pipes together while maintaining a constant welding pressure. Attachment, A - Clamp body, B... Hydraulic joint arm, C... Hydraulic clamp, pl, p2... Straight pipe, P3
...Bent pipe, P4... End plate, l... Groove surface, U... Tightening tool, 3... Center plate guide fitting, ψ... Set bolt, S...・Welding part, 6... End, 7... Hydraulic pressure / cylinder, Za... Hydraulic pressure / cylinder, 9... Clamp, 10. /l...Hydraulic pressure/Kib, lko...shaft, 13]...rod, /Hiro...through hole, l! ;...7 u, 16...fixing bolt. Application: Nomura Shoji Co., Ltd. 5-2 Representative: Takao Kawasaki Figure 1 and Figure 3

Claims (1)

[Scope of Claims] 1) The tip of the guide fitting attached to the clamp body is tightened by rotating it along the bevel surface of the pipe P1 and tightening it as appropriate. In a clamp for pipe welding, the welded part is aligned and centered by adjusting the screwing forward and backward adjustment of a set bolt that protrudes to an appropriate size on the surface and is screwed onto the tip. More than one arm is installed parallel to the axis of the pipe P1 on the circumferential surface of the end of the mating pipe P2 so that it can be adjusted forward and backward, and the forward and backward drive of the arm is connected to a hydraulic cylinder as appropriate. At least one hydraulic joint arm is provided, which is operated by driving force, and a hydraulic cylinder is installed at the tip of each arm of each of the hydraulic joint arms as a ramp that allows the vertical movement of the cylinder shaft itself to be freely adjusted. A hydraulic pipe welding clamp that is provided with a hydraulic clamp that is appropriately installed with its axis directed toward the center point of the pipe P2, and in which a hydraulic pipe is appropriately connected to each hydraulic cylinder.