JPH0630834B2 - Railless self-propelled carriage for welding - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a trackless self-propelled carriage for horizontal fillet welding, which is suitable for a member to be welded having a narrow lower plate serving as a traveling path.

[Conventional technology]

As a railless self-propelled bogie for horizontal fillet welding, one in which a pair of copying rollers abutting on a standing plate is attached to the front and rear of one side of the bogie is widely used. An example of this is an actual welding machine such as 53-12732 "Automatic Welding Machine", in which a pair of guide arms are attached to one side of a truck to abut the standing plate, and the front / rear wheels of the truck with respect to the traveling direction. Even if the standing plate is tilted and is cylindrical, a reliable copy can be secured. In this example, it is premised that the lower plate, which is the other target of fillet welding, is sufficiently wide so that the carriage can travel on the lower plate without any trouble.

Another example is JP-B-51-12014 "Corner welding welding carriage". The traveling surface (lower plate) is wide, but it is a curved surface, and permanent magnets are used for the wheels of the truck.
Further, since the height of the standing plate is low, the guide arm is arranged to contact the back surface of the guiding plate over the vertical plate.

[Problems to be solved by the invention]

In the case of a self-propelled welding machine that travels on the lower plate, it is difficult to use if the width of the lower plate is narrow and one of the left and right wheels of the bogie protrudes. Also, a lighter dolly is easier to handle, but it lacks running stability, and if the running surface is a curved surface such as a cylindrical surface, ordinary wheels may slip.In such a case, magnet wheels are effective. Is. However, in the magnet wheel, when foreign matter enters between the magnet wheel and the traveling surface (lower plate), the attraction force decreases, and the traveling becomes unstable.

An object of the present invention is to provide a railless self-propelled carriage capable of reliably performing horizontal fillet welding on a welding target whose bottom plate is narrow and cannot secure a sufficient traveling surface.

[Means for solving problems]

The present invention, in a trackless self-propelled bogie for fillet welding of a member to be welded consisting of a standing plate and a narrow lower plate, a pair of copying wheels attached to the front and rear of a bogie frame and abutting on the standing plate to rotate. , Mounted on the bogie frame, rolling on the upper surface of the lower plate, holding the lower plate from above and guiding the bogie to the standing plate,
A total of four guide wheels on the left, right, front and back, and a trolley frame mounted so as to be able to move forward and backward and pressed toward the lower plate by a spring, so that the lower plate is pressed from the lower side at the center of the rectangle drawn by the four guide wheels. And a drive wheel that is restrained and that is driven by a motor to roll on the lower surface of the lower plate.

[Action]

In this welding trolley, the upper guide wheels 2a to 2d and the lower drive wheel 5 travel while sandwiching the lower plate, so that the width of the lower plate is narrow and a sufficient traveling path cannot be secured. It is possible to perform stable running even when the sufficient distance cannot be secured.

〔Example〕

FIG. 1 is a plan view of a railless self-propelled carriage according to the present invention, and FIG. 2 is a side view of the same. A and B are members to be welded. As a specific example, A is a cylindrical body having a diameter of 880 mm and the like, B is a reinforcing ring that abuts on the inner surface thereof, and these abutting portions are welded by a welding torch 17 to a horizontal fillet. Weld. The thickness of the cylindrical body A is 14 to 16 mm, and the width of the reinforcing ring B is about 150 mm. This width is insufficient for running the welding carriage. Therefore, in the present invention, a method of sandwiching the reinforcing ring (lower plate) B from above and below is adopted. Reference numerals 2a to 2d are guide wheels for holding the lower plate B from the upper side, and 5 are drive wheels for holding the lower plate B from the lower side. These are attached to a truck frame 18, and a handle 16 is attached to the truck frame. Although the wheels 2a to 2d are driven wheels, the wheel 5 is a driving wheel and is driven by the traveling motor 4.

A pair of standing plate copying wheels 1a and 1b are attached to the upper part and front and back of the bogie frame 18, and these abut on the inner surface of the cylindrical body (standing plate) A. The trolley travels in the direction of arrow F. When the guide wheels 2c and 2d are tilted so as to move toward the standing plate A as shown in the drawing, the front guide arm (the arm to which 1a is attached) is the rear guide arm. If it is made shorter than the (arm to which 1b is attached), the dolly will move closer to the standing plate side as it travels, but it will be blocked by the copying rollers (copying wheels) 1a and 1b, and the dolly will end up along the standing plate. You will be able to drive. Wheel 2a that contacts the upper surface of the lower plate
.About.2d are at each corner of the rectangle, but the drive wheel 5 that contacts the lower surface of the lower plate is located at the center of the rectangle.

The welding torch 17 is attached to the torch holder 15, and the torch holder 15 is attached to the carriage frame 18 with the torch front-back adjustment mechanism 14. Reference numeral 14a is a screw shaft of the adjusting mechanism 14, and by rotating the screw shaft, the torch moves forward / backward. Three
Is a limit switch, which operates at the forward limit of the truck to stop the motor 4 and shut off the welding power source. The drive wheel 5 is pressed against the lower plate B by the spring 6, and the detachable lever 1
When 0, it moves forward to the lower plate B side and moves backward from it. Reference numeral 7 is an adjusting screw for adjusting the pressing force of the spring 6.

FIG. 3 and FIG. 4 show in particular the drive wheel 5 with the lever 10.
The lifting mechanism part of is shown. Reference numeral 9 is a slider for supporting the drive wheel 5, 8 is a guide rod thereof, 12 is a pin attached to the side surface of the slider 9, and 11 is a rotating shaft of a lever 10 attached to a carriage frame 18. The tip of lever 10 is 2
It is a crotch, and this portion engages with the pin 12. When the lever 10 is pushed down as shown by the dotted line in FIG. 4, the tip 2 crotch portion rises, which causes the slider 9 to rise and the drive wheel 5 to move.
To the lower plate B. When the drive wheel 5 is separated from the lower plate, the reverse operation is performed. Spring 6 is always slider 9
Since the lever 9 is pushed up, the slider 10 is retracted by the lever 10 against the spring pressing force, and the hook 13 holds the slider 9 in the retracted position.

FIG. 7 is a perspective view showing the relationship between the hook 13 and the lever 10. The lever 10 is composed of two parts, a front end part 10a having two crotch parts and a rear end part 10b which is manually operated.
Is pivoted by a rotary shaft 11 and is orthogonal to the rotary shaft 1.
The front / rear end portions 10a / 10b are connected by 9. Therefore the rear end portion 10b can be rotated in four directions of the arrows _F 1 to F _4,
Rotation in the directions of the arrows F ₁ and F ₂ causes the slider 9 to move forward and backward, and rotation in the directions of the arrows F ₃ and F ₄ causes the lever 13 to engage with and disengage from the hook 13.

The rear wheels 2c and 2d are mounted so as to be inclined, which is shown in detail in FIG. Upright plate A contact at the point where the copying roller 1b contacts the rear portion P, the wheels 2c, if the center line _l 1, _{l 2} of the 2d of the rotating shaft to a tangent P and the angle and theta _1, the angle theta ₁ is 90 Keep it below ゜. In this way, the rear part of the truck tries to approach the standing plate A as the truck advances in the direction of arrow F, and the copying roller 1b does not separate from the standing plate A.

The standing plate A may be linear, but in this case as well, θ may be smaller than 90. FIG. 6 shows this case, where θ is represented by an angle θ ₂ between the surface of the wheel and the standing plate A direction,
θ ₂ is preferably 2 ° to 4 °. Rear wheel 2 in FIG.
In addition to c and 2d, the front wheels 2a and 2d are also inclined at the same angle, so that the front and rear parts of the carriage try to approach the standing plate A when traveling in the direction of the arrow, and the length of the pair of guide arms increases. It is possible to follow and travel without the bottom.

The limit switch 3 operates by hitting an obstacle. If this obstacle is present on the welding target, it is used,
If not, install it at the position where welding should stop.

〔The invention's effect〕

This welding trolley has upper wheels 2a to 2d and lower wheels 5a.
Since the vehicle travels with the lower plate sandwiched between them, it is not possible to secure a sufficient traveling path due to the narrow width of the lower plate. Therefore, it is possible to perform stable traveling even when the left and right wheels of the bogie cannot be sufficiently spaced. In addition, since it is a method of sandwiching, sufficient pressure can be obtained between the wheels and the lower plate even if the trolley is lightweight and the permanent magnet wheels are not used, and reliable traveling without slips or the like is possible. Moreover, since the trolley is light in weight, it is easy to operate.

In this welding dolly, four upper wheels are placed at each corner of a rectangle, a lower wheel is placed at the center of the rectangle, and a lower plate is sandwiched between these upper and lower wheels (although the vertical relationship may be reversed). Can maintain a stable posture without tilting from the horizontal state. The wheels may be made of metal or may be fitted with rubber tires. The wheels can be moved forward / backward, and the distance between the left and right wheels may be changed according to the width of the ground.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a self-propelled carriage according to the present invention, FIG. 2 is a side view of the same, and FIGS. 3 and 4 are front and side views showing an elevating mechanism of drive wheels, respectively. FIG. 6 and FIG. 6 are plan views particularly showing the horizontal copying mechanism portion, and FIG. 7 is a perspective view showing particularly the hook portion of the drive wheel lifting mechanism. In the drawing, A is a standing plate, B is a lower plate, 18 is a bogie frame, and 1
Reference numerals a and 1b are copying wheels, 2a to 2d are guide wheels, 6 is a spring, 4 is a motor, and 5 is a driving wheel.

Claims (1)

[Claims] 1. A trackless self-propelled bogie for fillet welding of a member to be welded, which comprises a standing plate and a narrow lower plate, and is a pair of copying wheels attached to the front and rear of a bogie frame and rotating in contact with the standing plate. It is attached to the bogie frame, rolls on the upper surface of the lower plate, holds the lower plate from the upper side and guides the bogie to the standing plate. A total of four guide wheels on the left, right, front and back, and advance and retreat to the bogie frame. The guide plate is mounted so that it can be attached to the lower plate by a spring and is pressed toward the lower plate by a spring to hold the lower plate from the lower side at the center of the rectangle defined by the four guide wheels, and is driven by a motor to roll the lower surface of the lower plate. A railless self-propelled bogie for welding, comprising moving drive wheels.