JPH0438944Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an automatic welding device, and more specifically, to a device that performs continuous welding while automatically and continuously supplying a coated arc welding rod. .

(b) Prior Art Conventionally, the following automatic welding devices have been used to efficiently perform welding work and to improve the working environment.

A gravity welding device that uses its own weight to feed a coated arc welding rod downward along a slider.

A horizontal welding device that places a covered arc welding rod directly on the welding area.

A vertical advancement welding device that performs welding while automatically feeding a coated arc welding rod through arc length control (Japanese Patent Laid-Open No. 131249/1983).

In gravity welding equipment, a part of the sheath of the welding rod is brought into contact with the welding material, and as the welding material melts, the welding rod descends under its own weight. Therefore, welding cannot be performed unless it is a special rod with a special coating composition. Horizontal welding equipment also uses a rod placed on the welding groove, so welding is only possible with a special rod with a special coating composition.

Welding heat input (heat amount per unit time) is determined by welding current, voltage, and welding speed. Conventional gravity or horizontal welding equipment does not have a motor or the like to determine the welding speed, so it is not possible to set an arbitrary melting speed. As a result, any welding heat input cannot be received.

A weaving operation is taken to increase the width of the welding beat. This weaving operation refers to an operation of swinging the welding rod from side to side with respect to the welding line.
To do this automatically, a power source such as a motor is required. However, this is not possible with conventional devices because they do not have a power source. In addition, in the vertical advancement welding device, since the welding rod has a fixed elevation path, only vertical welding can be performed.

(c) Problems to be solved by the invention The problems to be solved by the invention are to obtain an automatic welding device that can accurately and quickly weld a desired weld bead width regardless of the type of welding rod used. There is a particular thing.

(d) Means for Solving the Problems The automatic welding device of the present invention includes a truck that runs on a rail along a welding line for welding materials, and a truck that moves independently of each other along the welding line on the truck. a pair of reciprocating tables, a weaving mechanism for moving the support rod in a direction perpendicular to the welding line on each reciprocating table, and a weaving mechanism attached to the free end of the support rod so that the welding rod can be raised and lowered and oscillated freely. a welding rod holding mechanism that holds the welding rod, a welding rod supply mechanism that supplies the welding rod to each welding rod holding mechanism, a detection signal from a detector that detects the amount of welding rod consumption during welding, and a position signal from each mechanism. The above-mentioned problems are solved by comprising a control device that receives the information and controls the operation of each mechanism.

(E) Embodiment An embodiment of the automatic welding apparatus of the present invention will be described with reference to FIGS. 1 and 2.

The main components of the automatic welding device are a cart 1, carriages 2a, 2b, weaving mechanisms 3a, 3b, welding rod holding mechanisms 4a, 4b, welding rod supply mechanism 5a,
5b and a control device 6.

The truck 1 runs on rails 8 arranged along the welding line WL of the welding material 7. Two sets of identical units A and B are provided on a truck 1. Each unit A, B is made up of a carriage 2a, 2b, a weaving mechanism 3a, 3b, a welding rod holding mechanism 4a, 4b, and a welding rod supply mechanism 5a, 5b. below,
The explanation will focus on unit A.

The carriages 2a and 2b move on the welding line WL on the carriage 1.
move independently of each other. Shuttle carriage 2a,
2b are fed independently from each other by feed screws 21a and 21b.

The weaving mechanism 3a is provided on the carriage 2a. The weaving mechanism 3a is made up of a slider 31a with a rack, a pinion 32a, and a motor 33a. The motor 33a rotates the pinion 32a to move the slider 31a in a direction perpendicular to the line WL.

The welding rod holding mechanism 4a is a slider 31 with a rack.
It is provided at the tip of a. This mechanism 4a is made up of a slider 41a with a rack, a guide 42a, a lifting motor 43a, a pinion 44a, an angle adjustment motor 45a, a holder 46a, a lower limit switch 47a, and an upper limit switch 48a.

At the free end of the slider 31a with a rack, motors 43a, 45a, a pinion 44a, a guide 42a
is installed. Slider with rack 41
a is inserted into the guide 42a, and the pinion 44a
It is raised and lowered by a motor 45a, and its angle is adjusted by a motor 45a. Upper and lower limit switches 47a, 48
A is attached to the slider 41a with a rack, and regulates the upper and lower limits of the vertical movement distance of the slider 41a. A holder 46a is attached to the lower end of the slider 41a and holds the welding rod 9.

The welding rod supply mechanism 5a is mounted on the cart 1 and supplies the welding rod 9 to the welding rod holding mechanism 4a. The mechanism 5a is made up of a robot hand 51a and a container 52a. The robot hand 51a grabs the welding rod 9 from the container 52a and holds it in the holder 46.
a to hold the welding rod 9.

The control device 6 receives a detection signal from a detector 61 that detects the amount of consumption of the welding rod 9 during welding and each mechanism 2.
a, 2b, 3a, 3b, 4a, 4b, 5a, 5b
The controller 62 receives position signals from the controller and controls the operation of each mechanism.

Another embodiment of the welding rod supply mechanisms 5a, 5b will be described with reference to FIGS. 3 to 5. Since the mechanisms 5a and 5b are the same, one mechanism 5a
I will explain about it.

The welding rod 9 is inserted into the air cylinder 5 in the supply box 57a.
It is lightly pressurized with 3a etc. Spacer 56 connected to belt 55a by rotation of motor 54a
a is rotated. Spacer 56a is supply box 57a
When passing under the recess, only one welding rod 9 is supplied to the recess and is stopped by a limit switch at the position shown. After the holder 46a (Fig. 5) is stopped directly above by the limit switch, the cylinder for moving the rod up is actuated by air or the like by the relay switch, and the rod is moved up to the holder position by the rod advancing plate 58a, and the relay is activated. Air cylinder 4 by switch
61a (FIG. 5), the welding rod 9 is attached to the holder 46.
It is fixed at a.

The cylinder 59a is actuated by the relay switch, and the lever 591a is moved backward using the 0 point as a fulcrum, thereby setting the welding rod 9 in a free state and completing the replenishment. Next, after the A side moves to the left for welding, it returns to its original state by the operation of the cylinder 59a and starts supplying the next rod again.

The fixing plate 561a acts to prevent the welding rod 9 from coming off from the supply spacer 56a.

(F) Action The case where welding is started from the unit on the A side will be explained. First, an arc is generated using a high frequency or the like.
By sensing the arc voltage on the A side, the truck 1 is started at a set speed and direction. On the other hand, the B side also receives a supply of welding rods 9 from the welding rod supply mechanism 5b and stands by in a state where arc start can be performed.

When the welding rod 9 is fed to the lower limit switch 47a, the feed screw 21b rotates and the tip of the welding rod 9 on the B side moves to the position where it contacts the welding material 7, is stopped by the limit switch, and is stopped by the relay switch. The side arc starts.

Sensing the arc voltage on the B side, the feed screw 2 on the A side
1a is rotated by a motor, and while moving the carriage 2a on the A side to the welding rod supply position, the slider 41a is pulled up to the upper limit switch 48a. The slider 41a stops at the rod supply position, receives the rod supply, moves close to the B side by the rotation of the feed screw 21a, is stopped by the limit switch, and receives the next arc generation instruction.

During this time, on the B side, at the same time as the arc starts, the feed screw 21b rotates and the welding rod angle adjustment motor 45b
While continuing welding, keep it at the same original position and angle as on the A side.

When the welding rod 9 is supplied to the lower limit switch 47b on the B side, the same operation as described above is performed. In this way, welding is repeated alternately on the A side and the B side.

Also, the welding line alignment during welding is detected by a sensor or a contact, and corrected by a motor as needed when it deviates from the set line. When a welding weaving operation is required, it is provided by the rotation of motors 33a, 33b.

(g) Effect According to the present invention, the following effects can be obtained.

To continuously and efficiently obtain a good weld bead even when a person without welding skills performs welding.

When welding high-grade steel, the welding heat input is limited, but welding can be performed with any heat input.

Weaving welding is possible to widen the welding width.

Welding is possible with all types of coated arc welding rods.

The reliability of the test data is improved because the welding speed is more accurate.

Saves labor and costs for shielded arc welding.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of essential parts of an automatic welding device of the present invention, and FIG. 2 is a cross-sectional view taken from the - line in FIG. 1. FIG. 3 is a plan view of an embodiment of a welding rod supply mechanism. FIG. 4 is a side view of FIG. 3. FIG. 5 is a plan view of the holder. 1...Dolly, 2a, 2b...Reciprocating platform, 3a, 3
b... Weaving mechanism, 4a, 4b... Welding rod holding mechanism, 5a, 5b... Welding rod supply mechanism, 6...
...Control equipment, 7...Welding material, 8...Rail, 9...
…Welding rods.

Claims (1)

[Scope of utility model registration request] A cart that travels on a rail along the welding line of the welding material, a pair of carriages that move independently of each other along the welding line on the carriage, and a carriage that runs perpendicular to the welding line on each carriage. a weaving mechanism that moves the support rod in a direction; a welding rod holding mechanism that is attached to the free end of the support rod and holds the welding rod in a vertically adjustable manner; and a welding rod that is supplied to each welding rod holding mechanism. An automatic welding device consisting of a welding rod supply mechanism and a control device that controls the operation of each mechanism by receiving a detection signal from a detector that detects the amount of consumption of the welding rod during welding and a position signal from each mechanism.