JPH0312455Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an automatic stiffener welding device for welding the stiffeners of a ship's hull.

(Prior art) In large ships such as oil tankers and ore carriers, it is necessary to increase the longitudinal strength of the hull, so the longitudinal plate members of the hull, such as the bottom, side shell plates, longitudinal bulkheads, and decks, have a T-shaped cross section or Longitudinal stiffener with L-shaped cross section is approximately 600~
They are welded at intervals of 1200 mm, and the longitudinal plate members and longitudinal stiffeners have a structure that ensures the necessary second moment of inertia of the hull cross section.

Since the longitudinal stiffeners used for each ship account for approximately 30% of the total weight of the hull, the effect of reducing production costs is significant.

Even if the longitudinal stiffeners mentioned above are used in the same hull, they come in various sizes and thicknesses, and they also vary in length.
Because they are over 12 meters long and heavy, equipment that can automatically assemble and weld the stiffeners has not yet been put into practical use.

Conventionally, when manufacturing longitudinal stiffeners, a gravity welding machine with relatively high productivity has been used to weld downward fillet welds between webs and flanges.

Gravity welding machines have a guide rod extending from the top of the two-pronged leg, and a welding torch is slidably attached to the guide rod, and as the welding rod wears out, the torch descends and automatically welds the welding rods one by one. This is a downward fillet weld.

On the other hand, Japanese Patent Publication No. 57-36070 discloses that when a stiffener consisting of a web and a flange is temporarily welded to the outer surface of a structure, the fillet weld between the base end of the web and the structure is automatically welded. Fillet welding equipment for welding is described.

(Problem that the invention aims to solve) When welding the corners of the web and flange using a gravity welding machine, each skilled worker can use up to eight welding machines, so the work efficiency is relatively high. However, for example, to weld two corners of a 16 m long stiffener, it is necessary to frequently replace approximately 46 welding rods (5 mmφ x 700 mm welding rods), and 1
Even when using 8 machines, it not only takes about 17 minutes net welding time per stiffener, but it also requires replacing the welding rod, repairing and shaping the bead at the location where the welding rod has been replaced, and derailment. Incidental work such as reworking the beads and removing slag on the beads is also required, so each stiffener requires a total of about 30 minutes of man-hours.

Therefore, the use of a self-propelled welding machine such as a CO ₂ welding machine was considered, but even if the weight of the equipment was reduced as much as possible, it would still weigh about 30 to 40 kg, so problems in handling the equipment remained.

In addition, it was considered that automatic welding equipment could be installed in the middle of the conveyor line to weld the tack-welded stiffeners while being conveyed, but this type of equipment would not significantly improve the welding speed. , it is necessary to install multiple devices,
In this case, not only is the equipment cost high, but also a large factory space is required, and existing stiffener assemblies cannot be applied to the stage. By the way, the fillet welding equipment described in the above publication is not essentially for assembling stiffeners, but for single-sided fillet welding of horizontal stiffeners to the outer surface of vertically installed structures. The flange of the stiffener is held from both sides by guide wheels, and the guide wheels guide the flange along the horizontal web. It cannot be applied when there is no flange to serve as a guide, such as in the case of an inverted T-shaped welded assembly with a flange.

(Means for Solving the Problem) The automatic stiffener welding device according to the present invention is capable of welding a stiffener in the longitudinal direction of a pair of left and right stiffeners consisting of a flange and a web with the web vertically erected on the flange. An apparatus for automatically fillet welding an extending downward corner, which includes a frame, at least one pair of front and rear support rollers provided on the lower side of the frame and rolling on the upper end surface of the web, and a vertical support shaft connected to the frame. at least one pair of front and rear drive rollers that are supported by the frame and come into contact with one side of the web; a presser roller that is biased to press against the other side of the web by a biasing mechanism; - A drive device that drives in reverse, a guide wheel that abuts on a pair of left and right corners,
A guide frame that rotatably supports each of the guide wheels, a height adjustment mechanism that supports each guide frame on the frame in a height-adjustable manner, and a welded frame that is supported by each of the guide frames and faces each corner. It is equipped with a torch.

In the above configuration, the frame and the components attached to the frame are supported by a pair of support rollers that roll on the upper end surface of the web, and when the drive device rotates the pair of front and rear drive rollers, the drive roller and presser The entire device travels along the stiffener while holding the web between the rollers. At this time, each guide wheel rolls while touching the downward corners on both sides of the lower end of the web. The welding torches welded will weld each downward corner in a predetermined positional relationship.

Since the web is held between the presser roller and the driving roller which are urged by the urging mechanism, the frame is held in a substantially horizontal state through these rollers without being tilted with respect to the web. In addition, even if the thickness of the web increases or decreases, the web can be held between the presser roller and the drive roller and run.

Furthermore, when the height of the web changes, the height of the guide ring and welding torch relative to the frame can be adjusted by adjusting the height of the guide frame via the height adjustment mechanism.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

On the surface plate S of the stiffener assembly stage, a stiffener L having a T-shaped cross section, which is made by temporarily welding a web 2 and a frame 3, is placed in an inverted T-shape and arranged along the front-rear direction. ing.

This automatic stiffener welding device is suspended from a self-propelled platform 4 that runs along the stiffener L and a guide rail 6 that is disposed above the stiffener L in parallel with the stiffener L. It is comprised of a self-propelled core wire supply box 5, a control box (not shown) for controlling the CO ₂ gas and welding current supplied to the welding torch 7 of the self-propelled base 4, and the like.

The self-propelled platform 4 is configured as follows.

That is, the frame 8 forming the main body of the self-propelled platform 4 is constructed as a lightweight, flat steel box-like body.
A pair of front and rear support rollers 9 are attached to the lower center of the web 2 via a bracket 10, and the entire self-propelled platform 4 is supported by the support rollers 9 that roll on the upper end surface of the web 2. .

Bearing sleeves 11 are vertically fixed to the front end and rear end of the frame 8 on the right side, and a vertical support shaft 12 is inserted into each sleeve 11 so that the frame 8 is immovably supported in the axial direction. A drive roller 1 is attached to the lower end of each vertical support shaft 12 that protrudes downward.
3 is fixed, and each drive roller 13 is connected to a presser roller 9.
is positioned so as to come into contact with the right side surface of the web 2 when its substantially central portion is on the upper end surface of the web 2.

A motor 14 with a reducer is mounted vertically on the frame 8 at a position midway between the front and rear vertical support shafts 12, and an output shaft 15 of the motor 14 is provided with a pair of upper and lower sprockets 16. 16 is provided at the upper end of the vertical support shaft 12 on the front side, and a sprocket 16 corresponding to the other sprocket 16 is provided at the upper end of the vertical support shaft 12 on the rear side. A chain 17 is wound between them, so that a pair of front and rear drive rollers 13 are synchronously driven by a motor 14 to rotate forward and reverse in the same direction at a predetermined rotational speed.

A roller support 18 is installed on the underside of the frame 8 as shown in FIG. is pivotally supported via a pivot pin 19 in a direction perpendicular to the web 2, and the roller support 18 has a support shaft 2.
The presser roller 21 is rotatably attached to the frame 8 via the frame 8, and the roller support 18 is biased toward the web 2 to press the presser roller 21 against the left side of the web 2. The lower end of the protruding bracket 22 and the middle part of the left side of the roller support 18 are connected by a double-acting air cylinder 23, and the piston rod 23a of the air cylinder 23
When the web 2 is extended to almost a full stroke, the spindle 20 of the presser roller 21 becomes vertical as shown in FIG. When the piston rod 23a is retracted, the roller support 18 swings around the pivot pin 19, and the presser roller 21 is laterally separated from the web 2.

Of course, instead of the air cylinder 23, a hydraulic cylinder or a housing may be used to urge the roller support 18 toward the web 2.

A pair of guide wheels 24 that roll across each corner are attached to the sides of the web 2 so that the pair of left and right corners formed by the lower end of the web 2 and the flange 3 can be simultaneously welded from both sides. Each pair of guide wheels 24 is rotatably supported by a guide frame 25, and a welding torch 7 is attached to each guide frame 25.
is fixed toward the corner, and the welding torch 7 is guided through the guide ring 24 so as to maintain a predetermined positional relationship with respect to the corner to be welded.

In order to accommodate changes in the height of the web 2, rods 26 erected at the side ends of each guide frame 25 are threadedly inserted into female threaded sleeves 27 of the frame 8. A handle 28 is provided for rotational operation.

The lower end of the rod 26 is a guide frame 25.
is rotatably connected to the axially immovable,
By rotating the rod 26 with the handle 28, the height of the guide frame 25 can be adjusted up and down.

The welding torch 7 is a torch of a CO ₂ welding machine, and the welding core wire 29 is supplied from the core wire supply box 5 and is supplied to the welding torch 7 via a core wire feeding roller 30 provided on the frame 8. However,
The feeding speed can be adjusted by a motor 30a that drives the core wire feeding roller 30.

In addition, the control box
The CO ₂ hose 31 and cable 32 are suspended from the guide rail 6 via a hook with an idler wheel and connected to the welding torch 7.

The core wire supply box 5 is suspended by an electric trolley hoist 33 that is self-propelled along a guide rail 6, and is configured to self-propel at the same speed as the self-propelled table 4.

However, it goes without saying that the core wire supply box 5 and the control box may be mounted on the frame 8 of the self-propelled platform 4.

In addition, not only the stiffener L with a T-shaped cross section, but also the
Of course, the shaped stiffener L can also be welded in the same way.

Next, the operation of the automatic stiffener welding apparatus will be explained.

With the web 2 temporarily welded to the flange 3, the flange 3 is fixed on the surface plate S, the self-propelled base 4 is set at the end of the stiffener L, and the welding torch 7 is heated with a predetermined current and CO ₂ When the motor 14 is driven while supplying gas and driving the core wire feeding roller 30 to supply the core wire 29 at a predetermined feeding speed, the web 2 is driven with the presser roller 21 and the drive roller 13 sandwiching the web 2. As the roller 13 rotates, the support roller 9 rolls on the upper end surface of the web 2, and the self-propelled base 4 self-propels along the stiffener L, and the left and right welding torches 7
It will run on its own while automatically fillet welding each corner.

(Effects of the invention) As explained above, in the present invention, the frame and the components attached to the frame are supported by the support roller that rolls on the upper end surface of the web, the web is held between the presser roller and the drive roller, and the web is driven. By rotating the driving rollers in the device, the entire device is made to run on its own along the stiffeners, so the device is significantly smaller compared to the case where a conveyor line, etc. is installed, and there is no need to provide special installation space. Without,
An appropriate number of this device can be applied to existing stiffener assembly stages, and the manufacturing cost of the device is relatively low. Since welding is performed automatically, one worker can operate two to three devices, resulting in excellent productivity.

Since the presser roller is designed to press against the web using a biasing mechanism, it can not only cope with changes in the thickness of the web, but also adjust the height of the guide frame via a height adjustment mechanism. This makes it possible to adjust the heights of the guide ring and welding torch with respect to the frame, so it is possible to adequately cope with changes in the height of the web.

In other words, it is highly versatile and can flexibly accommodate stiffeners of various sizes and thicknesses.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view showing a stiffener being welded by an automatic stiffener welding device, and FIG. 2 is a front view of the same. L... Stiffener, 2... Web, 3... Flange, 7... Welding torch, 8... Frame, 9...
Support roller, 12... Vertical support shaft, 13... Drive roller, 14... Motor, 16... Sprocket,
17...Chain, 18...Roller support, 19
... Pivot pin, 20 ... Support shaft, 21 ... Presser roller, 22 ... Bracket, 23 ... Air cylinder, 24 ... Guide ring, 25 ... Guide frame, 26 ... Rod, 27 ... Female screw sleeve.

Claims (1)

[Scope of Claim for Utility Model Registration] In an apparatus for automatically fillet welding downward corners extending in the longitudinal direction of a pair of left and right stiffeners consisting of a flange and a web with the web standing vertically on the flange. , a frame, at least one pair of front and rear support rollers provided on the lower side of the frame and rolling on the upper end surface of the web, and at least one pair of front and rear support rollers supported by the frame via a vertical support shaft and in contact with one side of the web. A pair of drive rollers, a presser roller that is biased against the other side of the web by a biasing mechanism, a drive device that is disposed on the frame and drives the drive rollers in forward and reverse rotation, and a pair of left and right corners. a guide ring that comes into contact with each of the
A guide frame that rotatably supports each of the guide wheels, a height adjustment mechanism that supports each guide frame on the frame in a height-adjustable manner, and a welded frame that is supported by each of the guide frames and faces each corner. An automatic stiffener welding device characterized by being equipped with a torch.