JPS605985Y2 - Welding traveling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traveling device useful for automatic or semi-automatic welding in an upright or upward position.

In large thin plate welded structures such as underground LNG (liquefied natural gas) tanks and LNG tankers, complex joints are often manually welded in an upright or upward position using TIG welding or plasma welding.

With automatic welding, even unskilled workers can easily obtain uniform and good welded joints, so welding automation is being actively promoted in all fields, but conventional automatic welding equipment is still in its infancy. Short joints and small parts are often done manually because it takes a lot of time to attach and remove them from the material.

On the other hand, there is a portable, portable semi-automatic welding device that allows even unskilled workers to easily perform welding without the hassle of installing and removing the device. Since welding is performed in a downward or horizontal orientation, it cannot be used in an upright orientation or an upward orientation.

However, manual welding requires a high level of skill, making it difficult for unskilled workers, and it is inevitable that we must rely on skilled workers who have high wages, contributing to increased costs.In addition, the number of skilled workers is decreasing these days. Therefore, there is a strong desire to further automate welding.

For this reason, in order to automate or semi-automate the welding of short joints, etc., there has been a desire for a lightweight and compact traveling device that can be easily attached and detached.

The present invention is in response to the above-mentioned needs, and aims to provide a lightweight and compact traveling device that enables automation or semi-automation of vertical and upward welding, while also having an oscillation adjustment function.

The structure of the welding traveling device of the present invention, which is distantly related to this purpose, is that two pairs of front and rear traveling wheels, which sandwich the guide rail in the left and right directions perpendicular to the longitudinal direction thereof, are rotatably attached to the traveling trolley. The guide shaft extending in the left and right direction is rotatably attached to the traveling truck, and a gear that rotates integrally with the guide shaft and meshes with a coaxially integral gear with either the front or rear traveling wheel is slidably mounted on the guide shaft. The traveling truck is provided with a switching means connected to the gear fitted to the guide shaft and capable of disengaging the gear from the gear integral with the traveling wheel. A camshaft extending parallel to the guide rail and to which a cam is fixed is rotatably attached to the adjustment baseplate, and the camshaft is rotatably installed on the camshaft and the traveling carriage. and a drive motor that drives the guide shaft via a universal joint or a flexible shaft joint, and the guide rod extending in the left and right direction is fixed to the adjustment base plate, and the oscillator plate to which the welding torch is attached is connected to the guide rod. A guide member is installed to be reciprocally movable along the rod, and is further positioned on the left and right sides of the cam on the oscillating plate, and swings the oscillating plate left and right by alternately contacting the cam as the cam rotates. It is characterized by having the following.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings from FIG. 1 onwards.

FIG. 1 showing the general appearance of this embodiment and its side shape,
As shown in FIGS. 2a and 2b, which respectively show the planar shape, the guide rail 2 that guides the traveling bogie 3 along the welding line 1 has a strip-like shape, and the left and right edges thereof are chevron-shaped projecting in the width direction. is formed.

The guide rail 2 is provided with clamping means such as magnets and suction cups (not shown) at both ends or at appropriate predetermined intervals,
By using this clamping means, it is possible to attach or detach the material to be welded with a single touch.

The traveling bogie 3 is constructed by sandwiching the guide rail 2 between two pairs of front and rear traveling wheels 4, 4'.
can be attached to.

The running wheels 4゜4' have a drum shape corresponding to the shape of the left and right side edges of the guide rail 2 mentioned above, and their surfaces are coated with a material with a high friction coefficient, such as rubber, but the overall shape is It is also possible to make it from hard rubber.

The left and right distances between the running wheels 4 and 4' are positioned slightly narrow so that the running cart 3 does not fall off the guide rail 2 even if it is turned upside down by firmly sandwiching the guide rail 2 between them. The guide rail 2 strongly holds the traveling carriage 3 by the elastic deformation and friction of the rubber layer.

These running wheels 4, 4' are rotatably attached to the running trolley 3 so that the wheels 5, 5' are perpendicular to the guide rail 2, and a sprocket 6. A chain 7 is passed between the wheels 6' so that the front and rear running wheels 4° and 4' rotate in conjunction with each other.

The above-mentioned winding transmission means may be replaced with other transmission means such as a pulley and a belt.

The drive system for driving the running wheels 4, 4' includes a worm 8.
A clutch (switching means) 12 is installed in the middle of the gear train consisting of the worm wheel 9 and bevel gears 10 and 11, that is, between the worm wheel 9 and the bevel gear 10, and a clutch (switching means) 12 is installed in the drive motor 13 installed on the traveling truck 3. The rotation of the worm 8 formed on the drive shaft 14 is controlled by one pair of running wheels 4.
By switching the clutch 12, automatic driving and semi-automatic driving by operator handling can be selected.

In other words, the irreversible rotation effect caused by the engagement between the worm 8 and the worm wheel 9 prevents the traveling cart 3 from falling due to its own weight during vertical welding, but on the other hand, this irreversible rotation effect makes semi-automatic running impossible. Therefore, a clutch 12 is interposed between the worm wheel 9 and the running wheels 4, and semi-automatic running is enabled by disengaging the clutch 12.

As shown in Figure 3a, which shows the structure of this power transmission section,
The clutch 1 for switching between automatic driving and semi-automatic driving
2 is intended to disconnect and disconnect power transmission by bringing two opposing discs into contact with each other, and employs a general dog clutch in which sawtooth-like irregularities are formed on each of the opposing surfaces.

One disc 12a constituting this clutch 12 is connected to a worm wheel shaft (guide shaft) 1 by a sliding key 15.
6 and is slidably fitted to this worm wheel shaft 16.

The other clutch disc 12b is restricted from moving along the worm wheel shaft 16, but is rotatably attached to the worm wheel shaft 16, and is formed integrally with the bevel gear 11. There is.

This switching operation of the clutch 12 is performed using the switching lever 1.
This is done by a pair of control rods 18 that are interlocked with the control rods 7.

As shown in FIG. 3, the control rod 18 has a rack 20 on one end thereof that engages with the switching lever 17 and an integral pinion gear 19, and a grip portion on the other end that grips the flange portion 21 of the clutch disc 12a. 22, which are moved in opposite directions by the rotation of the switching lever 17, that is, the pinion gear 19, to press one clutch disc 12a toward the other clutch disc 12b, or to press the other clutch disc 12a toward the other clutch disc 12b. It is designed to be pulled away from the plate 12b.

Note that the bevel gear 10. between the clutch 12 and the axle 5.
11 may be any motion transmission means that transmits motion between two orthogonal axes (drive shaft 14 and axle 5), so it is also possible to use other gears such as a face gear, friction wheels, etc. , it is also possible to provide the clutch 12 on the wheel 5 side.

Further, the traveling carriage 3 is provided with a handle 23 whose angle is freely variable.

This handle 23 is mainly used during semi-automatic driving, and is rotatably attached to the traveling trolley 3 by a connecting pin 24, and the handle 23 can be fixed at any angle by a locking mechanism. There is.

This locking mechanism has an engaging pawl 25 formed on the side of the traveling truck 3, a locking plate 26 having a pawl that engages with the engaging pawl 25, and a compression spring 27 that constantly engages the traveling truck 3. The lock arm 23 is attached to the handle 23 so as to be pressed against the engaging claw 25.
5 and the claw portion, the handle 2 is attached to the traveling trolley 3.
3, when the lock arm 23 is pulled to release the engagement between the engagement claw 25 and the claw portion, the handle 23
The angle can be changed freely.

The angle of the handle 23 may be changed as appropriate depending on the welding posture.

On the other hand, as shown in FIG. 4, which is an enlarged view of one end of the traveling vehicle 3, two mutually parallel guide rods 2 are provided at this end, extending in the left and right directions perpendicular to the traveling direction of the traveling vehicle 3.
9 is fixed, and a single feed screw shaft 31 parallel to the guide rod 29 is screwed into an adjustment base plate 30 that is slidably fitted to the guide rod 29.

Drive bevel gear 3 provided at one end of this feed screw shaft 31
2 meshes with a transmission bevel gear 34 provided at one end of an operating shaft 33 that is rotatably attached to the side of the traveling trolley 3 in parallel with it. By gripping the formed grip portion 35 and rotating the operating shaft 33, the adjustment base plate 30 can be moved left and right with respect to the traveling cart 3, but this is done by accurately moving the welding torch 36, which will be described later. This design is designed so that the welding line 1 can face the welding line 1.

A camshaft 38 extending in the traveling direction of the traveling carriage 3 and having a disc-shaped eccentric cam 37 is rotatably attached to the adjustment base plate 30, and a drive motor having the worm 8 formed thereon is rotatably attached to the adjustment base plate 30. 13 is a drive shaft 14 and this camshaft 38 are connected via a universal joint 39.

Therefore, even if the position of the adjustment base plate 30 changes, it is possible to transmit the rotation of the drive shaft 14 to the camshaft 38 without any problem, but it is possible to use a flexible joint instead of the universal joint 39. Good too.

Furthermore, an oscillator plate 42 to which a welding torch 36 is attached via a bracket 41 is fitted into the two guide rods 40 fixed to the adjustment base plate 30 in parallel with the guide rod 29 so as to be slidable left and right. This oscillation plate 42
Guide members 43 are formed on the left and right sides of the eccentric cam 37 so as to be in sliding contact with the eccentric cam 37.

As a result, when the camshaft 38 rotates, the oscillator 1142
is swung left and right, and the welding torch 36 is oscillated.
7, the eccentricity of the eccentric cam 37 must be appropriately selected in accordance with the width of the weld line 1.

Incidentally, the shape of the eccentric cam 37 may be any shape as long as the oscillating operator can swing from side to side when the eccentric cam 37 rotates.

When performing vertical and upward welding using the welding traveling device of this embodiment, first, a guide rail 2 is attached parallel to the welding line 1 at a constant distance.

The attached clamping means allows for easy one-touch operation, and removal is also the same.

Next, the traveling carriage 3 is attached to the guide rail 2.

Disengage the clutch 12 by operating the switching lever 17 to allow the running wheels 4, 4' to rotate freely, and then fit the running wheels 4, 4' along the guide rail 2 from the longitudinal direction. It is.

Since the guide rail 2 and the running wheels 4, 4' constitute a chevron-shaped guide, it is aligned at the same time as the running trolley 3 is installed, and the welding torch is moved at a certain height from the workpiece. It is a good idea to adjust the electrode positions in advance.

In parallel with this, the operating shaft 33 is turned to move the adjustment base plate 30 left and right so that the welding torch 36 accurately faces the welding line 1.

After a while, in the case of semi-automatic welding, the welding torch 36 is positioned on the welding line 1 at the starting point and the arc is ejected to start welding, while the drive motor 19 is turned on with the clutch 12 disengaged. shall be.

As a result, the rotation of the drive shaft 14 is transmitted from the universal joint 39 to the camshaft 38, and due to the cam engagement between the eccentric cam 37 of the camshaft 38 and the guide member 43, the welding torch 36 is transmitted in the left-right direction via the oscillating plate 42. The oscillating motion of is given.

At this time, the traveling carriage 3 is moved by grasping the handle 23, which is set at an optimal angle depending on the posture and operating environment, and checking the welding state.

This makes it possible to easily and quickly obtain a uniform and good weld bead.

In the case of automatic welding, first, the traveling carriage 3 attached to the guide rail 2 must be placed at the welding start point, and then the clutch 12 must be engaged to connect the drive system.

Then, the arc is blown and the drive motor 13 is activated.

As a result, automatic welding is started, and the rotation of the drive shaft 14 is transmitted via the worm 8, worm wheel 9, bevel gears 10, 11, and wheels 5 to the two pairs of front and rear running wheels 4, 4'. To run stably on a guide rail 2.

At the same time, the rotation of the drive shaft 14 is transferred from the universal joint 39 to the camshaft 3.
8, and due to the cam engagement between the eccentric cam 37 and the guide member 43, the welding torch 36 is transmitted via the oscillating plate 42.
oscillates from side to side.

Even if traveling is stopped during vertical welding, the traveling carriage 3 will not fall by itself due to the irreversible rotational action caused by the engagement between the worm 8 and the worm wheel 9.

As described above, according to the welding travel device of the present invention, the camshaft that swings the oscillating plate attached to the adjustment base plate to the left and right together with the welding torch and the drive shaft of the drive motor that drives and rotates the camshaft are connected by a universal joint or a flexible shaft. Since they are connected via a joint, the oscillating operation can be performed without any problem even if the adjustment base plate is moved from side to side so that the welding torch and welding line face each other directly.

Furthermore, it is possible to arbitrarily switch the driving of the traveling wheels that engage with the guide rails using a switching means to select between automatic travel and semi-automatic travel as necessary.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the external appearance of one embodiment of the welding traveling device according to the present invention, Fig. 2a is a longitudinal cross-sectional view thereof, Fig. 2 is a plan view of the inside thereof, and Fig. 3a is a FIG. 3 is a principle diagram of the power transmission mechanism to the traveling wheels, FIG. 3 is a principle diagram of the clutch operating mechanism, and FIG. 4 is an enlarged perspective view of one end of the traveling vehicle. In the drawing, 1 is a welding line, 2 is a guide rail, 3 is a running trolley, 4 is a running wheel, 8 is a worm, 9 is a worm wheel, 10.11 is a bevel gear, 12 is a clutch, 12a, 12
b is a clutch disc, 13 is a drive motor, 14 is a drive shaft,
15 is a sliding key, 16 is a worm wheel shaft, 17 is a switching lever, 18 is a control rod, 19 is a pinion gear,
20 is a rack, 21 is a flange portion of a clutch disc, 22
is a control rod gripping portion, 30 is an adjustment base plate, 31 is a feed screw shaft, 33 is an operating rod, 36 is a welding torch, 37 is an eccentric cam, 38 is a cam shaft, 39 is a universal joint, 40 is a guide rod, 4
2 is an oscillating plate, and 43 is a guide member.

Claims (1)

[Scope of utility model registration request] Two pairs of front and rear running wheels sandwiching the guide rail in the left and right directions perpendicular to the longitudinal direction of the guide rail are rotatably attached to the running truck, and a guide shaft extending in the left and right direction is rotatably attached to the running truck. A gear that rotates integrally with a guide shaft and meshes with a gear that is coaxially integral with one of the front and rear running wheels is slidably fitted to the guide shaft, and is connected to the gear fitted to the guide shaft. A switching means capable of releasing the engagement between the lever gear and the gear integrated with the traveling wheel is provided on the traveling truck, and an adjustment base plate movable in the left and right direction is installed on the traveling truck. A camshaft extending parallel to the guide rail and having a cam fixed thereto is rotatably attached to the plate, and the camshaft and a drive motor installed on the traveling truck and driving the guideshaft are connected by a universal joint or a flexible shaft joint. The guide rod extending in the left-right direction is fixed to the adjustment base plate, and an oscillating plate to which a welding torch is attached is installed so as to be able to reciprocate along this guide rod, and the A traveling device for welding, characterized in that guide members are provided on both left and right sides of the cam and swing the oscillating plate left and right as the cam rotates.