JPS6218267B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a welding machine that moves a welding torch along the edge of a corrugated rib to weld a pinched portion at the edge of a corrugated rib, and in particular, a welding machine that welds a pinched portion at both ends of a corrugated rib forming a transformer vessel, etc. This relates to a corrugate rib end welding machine that welds using a downward arc.

FIG. 1 is a front view showing the main parts of a conventional corrugated rib end welding machine, FIG. 2 is a top view of the entire machine, and FIG. 3 is a partially vertical front view thereof. In the figure, reference numeral 1 denotes a vertical rail, and a traveling carriage 2 is mounted so as to be able to move up and down along this vertical rail 1. The traveling truck 2 is provided with a torch holder 3, and a welding torch 4 is attached to the torch holder 3, which moves up and down together with the traveling truck 2 to weld the rib end pinch portion of the corrugated rib 5. ing. 6 is an upper limit switch that defines the upper limit of the traveling truck 2; 7 is an intermediate limit switch that stops the traveling truck 2 at an intermediate position; 8;
are lower limit switches that define the lower limit of the traveling vehicle 2, and are used to issue control commands to stop the traveling vehicle 2, respectively. 20 is a clamp arm that clamps the corrugated rib 5;
Reference numeral 21 denotes an air cylinder that moves the clamp arm 20 forward to clamp it, and to loosen it and move it back.

Next, the operation will be explained. First, the air cylinder 21 is activated to move the clamp arm 20 forward and clamp the corrugated rib 5. The welding torch 4 is held in a predetermined position by the torch holder 3 so as to face the pinched portion of the rib end, which is the welded portion of the corrugated rib 5, and the traveling carriage 2 moves up and down on the vertical rail 1. The traveling carriage 2 whose upper limit is defined by the upper limit switch 6 moves downward in response to a control command and once stops at the position of the intermediate limit switch 7. In this state, after starting the arc with a separate command, the traveling trolley 2 is further lowered,
Arc welding is performed up to the position 4a defined by the lower limit switch 8. After the completion of welding, the traveling carriage 2 is raised, and when the raising is completed, the air cylinder 21 is operated as shown in FIGS. 2 and 3, and the clamp arm 20 is loosened and moved backward.
The corrugated rib 5 is transferred one pitch by another feeding mechanism. The clamp arm 20 is moved forward again to clamp the corrugated rib 5, and welding is repeated in the same manner.

Since the conventional corrugated rib end welding machine is configured as described above, a good welding result can be obtained if the heights of the corrugated ribs 5 to be welded are all the same, but the arc start position is set by the intermediate limit switch 7. Since the corrugated ribs 5 are set at a constant height, if there is even a slight difference in the height of the corrugated ribs 5, the arc start position will be too high or too low, resulting in poor welding at the arc start part. Therefore, it was necessary to adjust the intermediate limit switch 7 every time the rib height changed.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and by adding a height detection device of the corrugated rib 5 to the conventional method, the corrugated rib end can be fixed at a constant arc start position. The purpose is to provide welding machines.

This invention provides a welding machine that moves a welding torch to weld a pinched portion at the end of a corrugated rib. a lever that rotates while contacting the upper end of the rib, a spring and a stopper that hold this lever in a detection standby position, a detection switch that detects the rotation of the lever and starts the arc, and a detection switch that starts the arc after starting the arc. This corrugate rib end welding machine is characterized by comprising an actuator that rotates the lever in a direction to prevent interference with a welding torch.

In the corrugated rib end welding machine configured as described above, when the traveling carriage is moved and the welding torch is moved up and down along the pinched part of the corrugated rib end, the lever in the detection standby position comes into contact with the upper end of the rib. and rotate. A detection switch detects this rotation and starts the arc, and as the traveling carriage moves, the actuator is actuated to rotate the lever in the direction against the spring, thereby preventing the welding torch from interfering with the corrugated rib.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a front view of essential parts corresponding to FIG. 1 showing an automatic corrugated rib end welding machine according to an embodiment of the present invention, and FIG. 5 is a partially enlarged perspective view thereof.
In the figures, the same reference numerals as in FIGS. 1 to 3 indicate the same or corresponding parts.

The vertical rail 1, traveling trolley 2, torch holder 3, welding torch 4, corrugated rib 5, upper limit switch 6, lower limit switch 8, clamp arm 20, and air cylinder 21 are constructed in the same manner as the conventional one, except for the intermediate limit switch. 7 is omitted.

A mounting bracket 9 projecting like a crank toward the corrugated rib 5 side is fixed to the traveling truck 2 so that the amount of protrusion can be adjusted. A face plate 10 is attached to the crank-shaped tip of the mount 9 so that its position in the vertical direction can be adjusted. A detection switch 11 for detecting rotation of a lever 15, which will be described later, is provided at the top of the face plate 10, and a stopper 12 is provided adjacent to this. A stopper 13 is provided.

A lever 15 is attached to the face plate 10 and is rotatable by an actuator 14, one end of which abuts against stoppers 12 and 13 to define a rotation range. An arm 17 is fixed to the other end of the lever 15 and has a ring 16 attached thereto that contacts the upper end of the corrugated rib 5, and is pulled by a spring 18 to urge the ring 16 downward. In the detection standby position where the ring 16 does not come into contact with the corrugated rib 5, one end of the lever 15 is in contact with the stopper 12 due to the bias of the spring 18, and as the traveling carriage 2 moves downward, the ring 16 moves to the upper end of the corrugated rib 5. When the lever 15 comes into contact with the lever 15, it rotates around the support shaft 19 against the spring 18. When one end of the lever 15 leaves the stopper 12, the detection switch 11 detects the movement of the lever 15 and issues a control command. The traveling cart 2 is temporarily stopped and arc started. Further, as the traveling carriage 2 moves downward after the arc start, the actuator 14 operates to further rotate the lever 15.
5 and the corrugated rib 5 from interfering with each other. Note that the lever 15 and ring 16 are also shown by chain lines in FIGS. 2 and 3.

Next, the operation and effect will be explained.

The traveling trolley 2, which was in the position of the upper limit switch 6, moves downward in response to a control command, and as shown in FIGS. 4 and 5, when the ring 16 fixed to the tip of the arm 16 comes into contact with the upper end of the corrugated rib 5, The lever 15 rotates slightly to the left around the support shaft 19 and separates from the stopper 12. The detection switch 11 detects this and issues a control command to temporarily stop the traveling carriage 2, and at this point start the arc. Therefore, even if the height of the corrugated rib 5 varies, the relationship between the welding torch 4 and the rib end arc start position remains constant.

In this state, after starting the arc according to the control command, the traveling carriage 2 is moved downward and the welding is completed when the lower limit switch is set at the 8 position. At this time, the actuator 14 is actuated so that the lever 15 does not interfere with the corrugated rib 5, and the lever 15 is rotated to the left so that it comes into contact with the stopper 13. Furthermore, after welding is completed and the traveling carriage 2 is raised to the upper limit switch 6 position, the actuator 14 is released and the lever 15 is returned to the original detection standby position. After moving the corrugated rib 5 by one pitch, welding is repeated again by the same operation.

In the above device, the lever 15 is attached to the traveling cart 2 so that the lever 15 comes into contact with the upper end of the corrugated rib 5 and rotates, and this rotation is detected by the detection switch 11 to perform an arc start. Even if the horizontal position of the rib end pinch part changes, be sure to move the lever 15 to the corrugated rib 5.
It can be detected by contacting the upper end of the arc, which allows arc starting to be performed at an accurate position. If you try to directly detect the upper end of the pinched part at the end of the corrugated rib 5 by attaching a limit switch to the traveling truck 2 or the face plate 10, it may not be possible to detect the upper end of the pinched part at the end of the corrugated rib if the horizontal position of the pinched part changes, or if the limit switch is connected to the corrugated rib 5. This will cause interference, but if the lever 15 is brought into contact as described above, this problem will not occur.
The upper end of the rib can be accurately detected even if the horizontal position changes.

In addition, in the above embodiment, the spring 18 is provided,
When the air in the actuator 14 is removed, the lever 15 is pulled and comes to rest against the stopper 12, but the actuator 14 may be given commands for forward and reverse rotation.

Further, the present invention is applicable not only to the case of forming a transformer container but also to welding of corrugated ribs in other cases.

As described above, according to the present invention, a lever that rotates in contact with the upper end of the rib is provided on the traveling truck, and the rotation of this lever is detected by the detection switch to start the arc, so that the height of the rib and The top edge of the rib can be accurately detected even when the horizontal position changes, which allows the arc welding start position to be constant, resulting in good welding results and making it easier to change setups due to changes in rib height. This has the effect of saving time and effort.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the main parts of a conventional corrugated rib end welding machine, Fig. 2 is an overall top view, Fig. 3 is a partially vertical front view thereof, and Fig. 4 is an embodiment of the present invention. Part 1 showing corrugated rib end automatic welding machine
FIG. 5 is a front view of the main part corresponding to the figure, and FIG. 5 is a partially enlarged perspective view thereof. DESCRIPTION OF SYMBOLS 1... Vertical rail, 2... Traveling truck, 4... Welding torch, 5... Corrugated rib, 9... Mounting bracket, 10... Face plate, 11... Detection switch, 12, 13... Stopper, 14... Actuator, 15... Lever, 16
...Ring, 17...Arm, 18...Spring, 1
9...Spindle. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A welding machine that moves a welding torch to weld a pinched portion at the end of a corrugated rib, which includes a traveling truck that moves the welding torch along the pinched portion of the corrugated rib end, and a rotating truck that rotates with respect to the traveling truck. A lever that is mounted so that it can rotate and abuts against the upper end of the rib, a spring and a stopper that holds this lever in a detection standby position, a detection switch that detects the rotation of the lever and starts an arc, and a carriage that runs after arc start. and an actuator that rotates the lever in a direction that prevents interference with a welding torch when the lever is moved. 2. The corrugate rib end welding machine according to claim 1, wherein the lever has an arm having one end abutting the stopper and the other end having a ring attached to the other end abutting the upper end of the rib. 3. The corrugate rib end welding machine according to claim 1 or 2, wherein the lever, spring, stopper, detection switch, and actuator are attached to a face plate provided on the traveling truck.