JPS60250897A - Welding truck for steel plate - Google Patents

Abstract

PURPOSE:To reduce an error of a torch which moves by following a joint surface of a shell, by providing wheels and an oscillating guide roller on a truck of a shell welding device, making the wheels contact to a rail on the floor, making the roller contact to a steel plate, and preventing the truck from falling down. CONSTITUTION:A base frame 25 transfers a torque from a driving device 29, to a driving wheel 26 and runs on a rail 24 by sharing a load with a driven wheel 27. Subsequently, an inner cylinder 35 goes into and out of an outer cylinder 32 by rotating a handle 34 and a frame 37 is lifted and lowered. Also, a roller seat goes into and out of a cylinder 38 by rotating a handle 40 of the frame 37 and a roller 41 is made to contact to an upper steel plate 21. A pair of rollers 41 are oscillated and contact to the upper steel plate 21, and a torch frame 43 is also oscillated toward the upper steel plate 21 side by a pin 42. The oscillation of the torch frame 43 is subjected to a position control in the upper steel plate 21 side by a torch roller 44, and the other side is subjected to a position control in a guide 52 side by a roller 51.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a truck for an apparatus for continuously and automatically welding the shells of steel plate tanks.

Conventionally, as shown in FIGS. 1 to 3, a welding device 11 is arranged around the outer periphery of a shell 10 of a tank constructed on a floor 5, and a running a-ra 13 is placed under a bogie frame 12 in contact with the floor 5. established,
The power of the drive unit 16 was transmitted to the row 213 via the gear 15. A generator 18, a wire supply device 6, and a gas cylinder 8 are further fixedly provided on the bogie frame 12, and a bracket 19
A torch 5 is provided connected to the pipe 4. The weight of the truck frame 12 is supported by the rollers 15 and 14iC, and positioning to follow the outer periphery of the shell 10 is performed by the guide rows 217. The tip of the torch 3 is directed toward the contact surface between the shell 10 and the shells 10A and 10B below it. The welding device 11 configured in this way welds the contact surface with the shield gas, arc cable, and welding wire to the torch 3 while going around the circumference along the arcuate surface of the shell IOA.

In order to achieve satisfactory welding, the distance between the position of the torch 3 and the contact surface to be welded must be ±1.0m, and if the tolerance range of ±1.0m is exceeded, the mechanical strength of the welded part will deteriorate. Variations, pinholes, and unevenness occur. Conventional welding equipment is a torch fixed to a trolley that simply runs on the floor.
[Smoothness of floor surface] It is considerably influenced by undulation. A trap guide roller that travels along the arc surface of the shell is fixed and installed on the trolley frame, and it is far away from the torch position, and the trajectory of the surface where the guide roller and shell touch is undulating and rattling. There was a large dimensional difference due to It would be best if the torch tip point at the contact surface was the same as the trajectory of the contact point of the traveling roller or guide roller, but the trajectories did not match and there was a large dimensional difference. Some of the steel plates are first processed with a roll bender, then transported through various transport machines to the point where they are made into tanks, where they are re-faced.However, they do not become a perfect circle or the set shape. It is necessary to move the torch completely following the position between the surfaces to be welded.

As described above, the present invention which is satisfactory by improving the drawbacks of the carts of conventional welding equipment has been obtained and is therefore provided.

An object of the present invention is to smoothly operate a torch carriage that moves to follow a joint surface to be welded with little error, and the gist thereof is as follows. In other words, a welding machine is installed on a truck that runs with rails attached to the outer periphery of the shell, which is an outer shell made of composite steel plates, and the truck, which is equipped with running rollers and guide rollers, is tipped over toward the shell. It is characterized by being able to run.

Embodiments of the present invention will be described below based on the drawings. To form the shell of a steel plate tank, an upper steel plate 21 and a lower steel plate 22, which are formed by bending a fixed length steel plate, are brought together at the joint surface 23 to form a circular arc shape on the outer periphery, and a rail 24 is placed on the floor near the outer periphery. establish. A driving wheel 26 and a driven wheel 2 are mounted on the underframe 25.
7 is connected to a drive device 29 to form a self-propelled trolley. The underframe 25VC carries a control panel 2B, a welding wire 61, a wire supply device 30, a cylinder for shielding gas (not shown), and the like. A welding wire, an arc cable, a shielding gas pipe, etc. are bundled together to form a pipe 55 of a welding machine. Underframe 25
Further, a mast-shaped outer cylinder 52 is fixedly installed, and an inner cylinder 35 and a handle 64 that slide inside the outer cylinder 52 are provided, but the slides including the following may be screw type or hydraulic type. A frame 67 is provided at the tip of the inner cylinder 35 via a bearing 36, a cylinder 38 is fixed to this frame 37, and a roller seat 69 and a handle 4 that slide inside the cylinder 38 are attached.
Set it to 0. At the tip of the roller seat 69 is a synthetic resin row 2.
41 is rotatably provided, and the roller 41 and the upper steel plate 21 are in contact with each other. The frame 37 includes a torch frame 43 which is swingable via a pin 42, and a hard and heat-resistant torch roller 44.
and a motor 45 are provided on this torch frame 45 VC.

A torch stand 47 is provided below the motor 45 and is movable up and down via a spindle 46, and connected to the pipe 63 described above. The torch stand 47K is provided with a spring 50 at a position closer to the torch row 244 in order to balance the position of the torch 48, the sensor 49, and the torch stand 47, that is, to limit the swinging.
A row 251 for cushioning is provided on the frame 67 so that the fixed guide 52 and the roller 51 are in contact with each other.

A box 50 is provided in the torch frame 4!1 so as to enclose the torch 48, and a flexible plate 51 such as a heat-resistant rubber sheet is interposed in contact with the upper steel plate 21 and the lower steel plate η.

It is preferable that the flexible plate 51 is shaped like a skirt and has a cut.

Next, the present invention having such a configuration will be explained in detail. First, the fulcrum which supports the weight of the whole by the rails 24 and supports the upper steel plate 21 to prevent the whole from collapsing will be clarified and will be explained in detail below.

The underframe 25 transmits the torque from the drive device 29 to the drive wheels 26 and distributes the torque to the driven wheels 27 on the rail 24 at speeds of 0 to 90 per second.
Drive at 0. The frame 67 is raised and lowered by rotating the handle 54 and sliding the inner cylinder 35 in and out of the outer cylinder 32. The height dimension between the upper surface of the rail 24 and the joint surface 23 is not constant (it is adjusted on a case-by-case basis by raising and lowering it to avoid protrusions on the outer surface of the shell. As it rotates, the roller seat 39 moves in and out of the roller seat 38, and the outer circumferential surface of the roller 41 and the outer circumferential surface of the upper steel plate 21 come into contact with each other.
The first pair is oscillated by a bearing 36 and comes into contact with the upper steel plate 21, and the torch frame 43 is also oscillated by a pin 42 toward the upper steel plate 21 side. The position of torch 4B is sensor 49
By detecting the lines of magnetic force, current fluctuations due to the presence or absence of a nitrogen gap on the joint surface 25 are read, and the motor 45 is determined by elevating and lowering at a speed of 0 to 10 ml per second by outputting a transmission signal for forward and reverse rotation. That is, the motor 4 fixed to the torch frame 45
The rotation of the torch holder 4 is converted into the normal force of the spindle 46.
Go up and down 7. The swinging of the torch frame 46 is limited in position by the torch roller 44 on the upper steel plate 21 side, and the other is controlled in position by the roller 51 on the guide 52 side. The distance between the joint surface 25 and the guide 5'2 varies along the circumference of the shell, and may be widened or narrowed, but the distance between the roller 51 and the guide 5'2 is absorbed by the self-contained spring 50.

Casters 53 are mounted on the underframe 25 with screws so that it can be raised and lowered freely, and when the underframe 25 is removed from the rail 24 and moved to the other side, it is rolled and transported.

With the above-mentioned configuration and function, the welding tool is mounted on the tower and its movement is restricted by fixed track rails, and the overturning of the cart is controlled by the steel plate, so it can travel around the outer circumference of the shell with double precision and swing. 5. Since the rollers are made of synthetic resin and come into contact with the steel plate, there are no rolling scratches due to pressure, and the rail backlash is absorbed, reducing runout.

The set trajectory on the joint surface of the steel plate and the trajectory due to the revolution of the rollers now match easily, making it possible to fine-tune the welding torch position, and the trolley is equipped with casters, making it easy to transport. Ta.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the relative relationship between the conventional truck frame and shell, Figure 2 is a diagram showing the conventional truck and welding tool mounting, and Figure 6 is a diagram showing the relative relationship between the conventional truck frame and shell.
The figure is a view taken along the line A-A in FIG. 2, and FIG. 4 is an overall view showing the present invention. 25: Underframe, 26: Driving wheel, 27: Driven wheel, 41: Roller, 24; Shi~ru, 21: Upper steel plate, 53: Caster 1. 40

Claims (1)

[Scope of Claims] 1. In a truck in which bent steel plates forming a part of a circular arc are stacked up and welded on the horizontal surfaces to form a shell, the truck is equipped with wheels and rollers that guide the rocking motion, and the wheels are placed on the floor. A steel plate welded cart, characterized in that the rollers are in contact with the rail and the rollers are in contact with the steel plate to prevent the cart from overturning. 2. A special r! feature in which screws are provided on the truck to fit the gear star and the wheels and floor top surface can be separated from each other! f. A steel plate welding cart according to claim 1. (5) The steel plate welding cart according to claim 1, wherein a control panel, a gas cylinder, a welding wire, and a welding wire supply device are removably mounted on the cart. 4. The steel plate welding cart according to claim 1, wherein the rollers of the cart are rollers made of synthetic resin that are raised and lowered and separated by cylinders.