JPH0751276B2 - Multi-layer automatic welding equipment for pile joints - Google Patents

Description

TECHNICAL FIELD The present invention relates to a multi-layer automatic welding device for pile joints.

"Problems to be solved by conventional techniques and inventions" In general, piles are piled into the ground as long piles by welding and unifying the piles at their end joints with an automatic welding machine. Have been implemented in.

Therefore, as such a welding method, conventionally, it is general to perform multi-layer welding by a semi-automatic or fully automatic welding machine,
In multi-layer welding of piles, a single arc welding torch mounted on a traveling platform that swivels around the pile is swung around the welding groove created by abutting the joints between the upper and lower piles. However, the welding metal of the first layer is piled up over the entire circumference, and then one arc welding torch is swung around the groove again, and the welding metal of the second layer is stacked on the welding metal of the first layer. The current situation is that welding is carried out by a multi-step operation in which heaps are raised over the entire circumference.

However, in such multi-stage welding, the arc welding torch is swung twice or more in one multi-layer welding, and the welding slag formed on the surface after the first welding is removed, and the position of the welding torch is adjusted. Since the work of welding the second layer above is involved, the welding work is complicated and time consuming,
There was a problem that work efficiency was poor.

Therefore, conventionally, two arc welding torches with different current intensities were attached at a predetermined interval in the traveling direction to a drive frame driven and driven along a guide rail provided around the pile, and this welding torch was jointed with the drive frame to the pile joint. Before the welding slag welded by the arc welding torch located in front of the groove is swollen around the groove of the part and hardened by the arc welding torch, it is piled up on it and the subsequent arc welding torch raises the deposited metal of the next layer. , Welding equipment is known that enables the welding of a pile to be completed simply by rotating the arc welding torch once, and without the need to remove slag or adjust the position of the welding torch. (Japanese Patent Publication No. 53-34168).

However, in this multi-layer welding device, welding equipment such as a welding torch and its attachment adjusting mechanism is attached to the drive frame, and therefore the entire device is mechanically complicated and heavy, and it is easy to handle. However, there are some problems that need to be solved, such as difficulties and some restrictions on the installation space for welding equipment.

"Means for Solving Problems" In order to solve the above-mentioned conventional problems, the present invention provides a drive frame that automatically travels along a guide rail provided around a pile,
A multi-layer automatic welding device for pile joints, in which a welded pedestal that can run freely along this guide rail is connected, and multiple arc welding torches are attached to this welded pedestal at predetermined intervals in the running direction. A multi-layer automatic welding device with a preheating gas torch and a slag removal brush installed in the front and rear of the arc welding torch in the running direction, and a windbreak cover on the side of the welding equipment installation part on the welding base. It proposes a multi-layer automatic welding device.

"Operation" By driving the drive frame that automatically rotates around the pile and rotating the welding frame connected to it, multiple arc welding torches installed at predetermined intervals in the direction of rotation are installed around the groove of the pile joint. First, the arc welding torch located in front of the turning direction raises the deposited metal of the first layer, and before the deposited metal of the first layer is hardened, it is superposed on it and the subsequent arc welding torch forms the next layer. The deposited metal is raised.

Therefore, the multi-layer welding can be completed by rotating the arc welding torch only once, and furthermore, the piles can be welded extremely simply without removing the slag and adjusting the position of the welding torch.

Also, the welding equipment such as the arc welding torch and its mounting adjustment member is installed on the welding pedestal that is separate from and connected to the drive pedestal, so there is no restriction on the installation space of the welding equipment and there is no freedom in design. Yes, it is easy to manufacture, and by attaching a preheating gas torch, the welding groove can be heated and dried in advance before welding to improve the subsequent welding, and the slag removing brush or windproof cover etc. Since auxiliary equipment can be attached and the welding part of the drive base and the welding base can be separately configured to be lightweight and compact, the device can be carried and attached / removed very easily.

"Example" Hereinafter, an example of the present invention shown in the drawings will be described.
An annular fixed base 2 is attached by a fixing screw 3 around the upper pile 1 in which the lower end joint is overlaid on the upper end joint of the lower pile 1 ′, and the annular base is attached to the outer periphery of the fixed base 2. A drive base 5 and a welded base 6 connected to the drive base 5 are attached to the guide rails 4 of FIG.

The drive pedestal 5 has upper and lower wheels 7 mounted on the back surface thereof engaged with the upper and lower sides of the guide rail 4, and an intermediate drive pinion wheel 9 meshing with a rack rail 8 mounted on the surface of the guide rail 4 is rotationally driven by a shift motor. By doing so, the upper pile 1 is configured to turn around.

The welded base 6 travels with the upper and lower wheels 10 mounted on the back surface thereof engaged with the upper and lower sides of the guide rail 4, and is attached to the front end and the rear end of the drive base 5, for example, hook-shaped hooks and rings. Is connected to the drive base 5 by a bendable connecting tool 11 made of a metal-like bracket, and is towed and run, and in order to prevent a rear-end collision with the drive base 5 when the running is stopped, A stopper 12 is projectingly provided at the rear end of the drive frame 5. A plurality of (three in the figure) groove-type guide holders 14 slidably enclosing the elevating rods 13 are mounted on the surface of the drive frame 5 at right and left intervals, and each guide holder 14 is elevated and lowered. A pinion gear 16 that meshes with a rack 15 formed on the side surface of the rod 13 is rotatably supported.
By rotating the support shaft 17 of the pinion gear 16 with the rotary knob 18, the vertical position of each elevating rod 13 can be adjusted up and down, and the clamp screw 19 can be tightened and fixed at each required position.

A guide rod 20 horizontally projecting in front of the welding base 6 is provided at the lower end of each elevating rod 13, and a groove type movable holder 21 is attached to the guide rod 20 so as to wrap the guide rod 20 so as to be movable back and forth. A pinion gear 23 that meshes with a rack 22 formed on the upper surface of the guide rod 20 is rotatably supported by the moving holder 21.
By rotating the support shaft 24 by the rotary knob 25, the front and rear positions of the movable holders 21 can be adjusted forward and backward, and the movable holders 21 can be tightened and fixed by the clamp screws 26 at the respective required positions.

A horizontal bracket 27 is projectingly provided on each moving holder 21,
A torch narrowing board 28 or 28 'is attached to the bottom surface of the torch narrowing board by a vertical pivot 29 so as to be horizontally rotatable.
28, 28 ′ is provided with an arc slit 30 having a pivot 29 as a center of curvature.
Through the through holes of the bracket 27, nuts 32 are screwed into the protruding upper ends of the clamp bolts 31 so that the torch narrowing boards 28, 28 'can be fixed at a required turning position.

Below the torch narrowing board 28 attached to the bracket 27 that moves forward and backward together with the moving holder 21 along the guide rods 20 located on the front end side and the rear end side of the welding part base 6 in the traveling direction,
V-shaped torch narrowing plates 33 are attached to the left and right flange-shaped end portions by fastening bolts 34.

A guide rod located in the middle of the traveling direction of the welded base 6
A bracket that moves back and forth along with a holder 21 that moves along 20
The torch narrowing board 28 ′ attached to the above may originally have the same structure as the torch narrowing board 28, but in the present embodiment, since the distance between the torch narrowing boards 28, 28 is narrowed by design, these In order to avoid overlapping with each other, a vertical portion 35 is provided below the vertical portion 35, and a torch narrowing plate 36 is attached horizontally to the vertical portion 35 by fastening bolts 37 at its left and right flange-shaped ends.

A preheating gas torch 38 is narrowly fixed and fixed in its main body between the torch narrowing board 28 and the torch narrowing plate 28 ', which are located on the front end side of the welding unit base 6 in the turning direction, and located in the middle thereof. Vertical part 35 of torch narrowing board 28 'and torch narrowing board
Between the torch narrowing board 28 and the torch narrowing board 28 ′ located on the rear end side, and the grip portion of the semi-automatic or fully automatic arc welding torch 39 and a similar arc welding torch 39 ′.
Each of the main body parts of the torch is tightly fixed with the tip of the torch facing the pile circumferential side.

A bracket 40 provided at the rear end of the welding base 5 in the turning direction is provided with a main body 42 for rotationally driving a slag removing brush 41 attached to the tip.

In addition, mounting base frames 43 of a required shape are provided below both side ends of the welded frame 5 and a windbreak cover is provided on this.
44 is detachably attached to the preheating gas torch 38 and the arc welding torch 39 'by means of hook-shaped hooks 45 or screws, etc. 46 is installed so that it can be opened and closed.

Arc welding torch 39, 39 'Welding conduit cable 4
7 is fed from a semi-automatic welding machine 50 suspended on a hanger 49 attached to an appropriate place such as a pile driving machine 48.

When welding the upper pile 1 and the lower pile 'mounted on the upper pile 1 using the fully automatic welding machine configured as described above, the fixed base 2 is mounted around the upper pile 1 and the fixed base 2 is fixed. The drive frame 5 and the welded frame 6 are attached to the guide rails 4 of the base 2, and they are connected by the connecting tool 11.

Next, using the rotary knob 18 of the welding base 6, each lifting rod 13
The vertical position of the torch tip of the preheating gas torch 38 and the arc welding torch 39, 39 'is adjusted to the welding groove 51 between the end plates of the upper pile 1 and the lower pile 1'. Adjustment, and then the movable knob 21 is moved forward and backward by the rotary knob 25, and the preheating gas torch 38 and arc welding torch 39, 39 'are adjusted while turning the torch narrowing plates 28, 28'.
The tip of each torch is adjusted and set to the welding groove 51 at a proper proximity position and angle.

In particular, the arc welding torch 39 for the first layer, which is located in front of the welding base 6 in the turning direction, is deeper than the arc welding torch 39 'for the second layer, which is located rearward, with respect to the welding groove 51. Set to position.

Further, the slag removing brush 41 is adjusted on the welding groove 51 by appropriately adjusting the mounting position of the main body 42 thereof.

After the welding preparation work is completed in this way, the drive frame 5
After turning on the start-up switch after adjusting the traveling speed of the welding starter and starting the turning traveling while pulling the welding part base 6, the welding power supply is also turned on in conjunction with this and the preheating gas torch 38 precedes the welding groove 51. Is heated and dried, and subsequently, the arc welding torches 39 and 39 'start welding while rotating in parallel with the periphery of the welding groove 51, and at the same time, the brush 41 for removing slag is formed on the surface of the welded portion where the multi-layer welding is performed. Sliding contact while rotating to automatically remove slag.

At this time, the preceding arc welding torch 39 deposits the deposited metal of the first layer, and the subsequent arc welding torch 39 'deposits the deposited metal of the second layer before the deposited metal hardens. It is essential to properly adjust the interval between the arc welding torches 39 and 39 'and the turning speed at such timing.

In this way, each arc welding torch is surrounded by the welding groove 51.
When 39, 39 'turn once and then the start switch is turned off, the welding power source is automatically turned off at the same time, and the multi-layer welding is completed in one pass.

Further, the windproof cover attached to the side surface of the welding frame 6 blocks the wind, which enables stable welding even under strong winds, and also shields the sparks of welding sparks (especially while shielding light with a light shielding transparent window while welding). The situation can be monitored), and the worker can work without wearing a light-shielding mask.

In the above embodiments, two arc torches are provided side by side, but two or more torches can be used for multi-layer welding of two or more layers.

Experimental example Using two steel pipe piles with a diameter of 700 mm and a plate thickness of 16 mm, a U-shaped groove (bottom R = 3 mm) with a throat thickness of 12 mm and a tip opening width of 10.4 mm was formed around each joint end. Multi-layer welding was performed depending on the conditions.

50mm Torch 39 arc current ・ ・ ・ 400A Torch 39 arc voltage ・ ・ ・ 26V Torch 39 'arc current ・ ・ 400A〃voltage ・ ・ 26V drive frame 5 running speed ・ ・35cm / min Welding wire ・ 3.2mm diameter non-gas shielded wire As a result, the mechanical performance (bending, tensile strength, etc.) of the welded part meets the SS-41 standard of the main body material, and good welding without breakage of the welded part The effect was obtained.

[Advantages of the Invention] As described above, according to the present invention, it is possible to complete the multi-layer welding in one pass only by turning the arc welding torch provided side by side once. The piles can be welded extremely simply and efficiently in a short time without the need to adjust the position of the welding torch each time they are stacked.

In addition, the welding equipment such as the arc welding torch and its attachment adjustment member is installed on the welding pedestal that is separated from the drive pedestal and connected to it, so there is no restriction on the installation space of the welding equipment and there is no freedom in design. In addition to being easy to manufacture, it is possible to attach auxiliary equipment such as a preheating gas torch, a slag removal brush or a windbreak cover.Preheating drying and slag removal of the welding groove with the preheating gas torch can be performed in parallel with welding. In addition, the windproof cover enables stable welding even under strong winds, shields the flash of welding sparks, and allows the worker to work without wearing a light-shielding mask.

Further, a conventional automatic welding machine stand can be used as the drive stand.

Further, since the welding parts of the drive base and the welding base can be separately configured to be lightweight and compact, the handling work such as carrying the device or mounting / removing the device is extremely easy.

[Brief description of drawings]

FIG. 1 is a perspective view showing an installed state of the welding apparatus of the present invention,
2 is a front view of the welding apparatus of the present invention, FIG. 3 is a side view of the drive mount according to the present invention, FIG. 4 is a side view of the weld mount according to the present invention, and FIG. 5 is related to the present invention. FIG. 6 is an exploded perspective view of the welded frame, and FIG. 6 is a plan view of the same. 1 …… Upper pile, 1 ′ …… Lower pile, 2 …… Fixed base, 3 ……
Fixing screws, 4 ... Guide rails, 5 ... Drive frame, 6 ...
… Welding frame, 7… Wheels, 8… Rack rails, 9…
… Drive pinion wheels, 10 …… wheels, 11 …… connectors, 12…
… Stopper, 13 …… Lifting rod, 14… Guide holder, 15… Rack, 16… Pinion gear, 17… Spindle,
18 …… Rotary knob, 19 …… Clamp bolt, 20 …… Guide rod, 21 …… Movement holder, 22 …… Rack, 23 ……
Pinion gear, 24 …… spindle, 25 …… rotating knob, 26 ……
Clamp bolt, 27 …… Bracket, 28,28 ′ …… Torch mounting board, 29 …… Axis, 30 …… Arc slit, 31 ……
Clamp bolt, 32 …… Nut, 33 …… Torch narrowing plate,
34 …… tightening bolt, 35 …… vertical part, 36 …… torch narrowing plate, 37 …… fastening bolt, 38 …… preheating gas torch, 39,3
9 '... Arc welding torch, 40 ... Bracket, 41 ...
Brush for removing slag, 42 …… Brush body, 43 …… Mounting base frame, 44 …… Windproof cover, 45 …… Hook bracket, 46…
… Shielding transparent window, 47 …… Welding wire, 48 …… Pile driver, 49
…… Hanger, 50 …… Semi-automatic welding machine, 51 …… Welding groove.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location E02D 5/24 102

Claims (3)

[Claims] 1. A drive frame that automatically travels along a guide rail provided around a pile, and a welded frame that can travel along the guide rail is connected to the drive frame at predetermined intervals in the traveling direction. A multi-layer automatic welding apparatus for pile joints, characterized in that a plurality of arc welding torches are mounted and a preheating gas torch is installed in front of the welding unit frame in the traveling direction. 2. The pile joint according to claim 1, wherein a brush for removing sludge is installed on the welded part pedestal behind the arc welding torch installation part in the traveling direction of the welded part pedestal. Multi-layer automatic welding equipment. 3. A windbreak cover is installed on the side of the installation part of the welding equipment on the welding base.
Alternatively, the multi-layer automatic welding device for a pile joint according to claim 2.