JPH0329016Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an automatic welding profiling device, and more particularly to an automatic welding profiling device that can accurately fillet weld an inclined vertical plate over a wide range of inclination.

2. Description of the Related Art As a tracing mechanism for automatic welding equipment, a mechanism shown in FIG. 1 is conventionally known. For example, in an automatic welding device that performs fillet welding based on NC information, a tracing roller block 4 with a welding wall detecting magnetic sensor 2 and a floor detecting magnetic sensor 3 attached to the tip of a welding torch 1 is placed inside a cylinder 6 supported by a bracket 5. By protruding and withdrawing the piston rod 9, the welding torch 1 is lowered or raised, the distance from the wall 8 and floor 7 to be welded is detected, and the output voltage obtained by each sensor 2 and 3 is transmitted to the control device. (a microcomputer, etc. not shown) to set the welding position of the welding torch. During welding, welding is performed based on NC information, but magnetic sensors are used at the start, end, and intermediate points of welding. 2, 3 intermittently put in and out
Correcting NC information.

However, in this profiling mechanism, when the vertical plate (wall surface) to be welded is inclined, if we want to be able to cope with a wide range of inclination, it is necessary to increase the detection distance of the magnetic sensor 3, and the magnetic The sensor 2 must be made large, the mechanism for taking the magnetic sensor in and out becomes complicated, and the area of interference such as contact with obstacles during welding becomes large. Furthermore, there is a limit to the detection range of the magnetic sensor 2, and there has been no automatic welding tracing device that can handle a wide range of inclinations of standing plates.

The present invention was developed in order to eliminate the above-mentioned drawbacks of conventional automatic welding tracing devices, and it is possible to accurately aim the welding torch in a wide range of inclination of the vertical plate to be welded during fillet welding. The purpose is to provide an automatic welding profiling device that can

The structure of the present invention to achieve the above object includes a roller block provided on the tip side of a welding torch supported by a bracket so as to be movable up and down along the welding torch, and a roller block supported by the roller block that extends from the corner. It is characterized by comprising a floor surface detection sensor and a wall surface detection sensor for detecting the constituent floor surfaces and wall surfaces, and a driving means provided on the bracket and the roller block to cause the wall surface detection sensor to protrude and retreat in the horizontal direction. do.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 2 shows a side view of essential parts of an automatic welding tracing device according to an embodiment of the present invention.

The welding torch 1 is held by a bracket 5 on the apparatus main body side. The figure shows a state in which it is held diagonally due to fillet welding.

Around the bracket 5, cylinders 6-1, 6-2, and 6-3 are provided in parallel to the longitudinal direction of the welding torch 1, divided into upper and lower parts in the illustrated state. At the tips of the piston rods 9-1, 9-2, 9-3 of each cylinder 6-1, 6-2, 6-3, which move forward or backward toward the tip side of the welding torch 1, there are piston rods surrounding the welding torch 1. A roller block 4 is connected.

Inside the roller block 4, there is a guide roller 3 that can roll on the welding torch 1, as shown in FIG.
A plurality of 0s are provided. Therefore, the roller block 4 is moved up and down in a circular motion along the welding torch 1 by the operation of the cylinders 6-1, 6-2, and 6-3. Instead of the guide roller 30, it is also possible to employ other rolling means such as a linear ball bearing.

The roller block 4 holds a floor detecting magnetic sensor 3 and a wall detecting magnetic sensor 2, which respectively detect a floor 8 and a wall 7 constituting a corner to be welded. The wall detection magnetic sensor 2 is configured to be reciprocated in the horizontal direction (lateral direction of the welding torch 1) by the operation of horizontal drive means 10 disposed on the bracket 5 and roller block 4.

As shown in FIG. 3, the horizontal drive means 10 is composed of a drive section 10A and an origin detection section 10B disposed on the bracket 5 side, and a horizontal drive force transmission section 10C disposed on the roller block 4 side. There is. The drive unit 10A is configured to transmit the driving force of the stepping motor 11 to a connecting shaft 15 fixed to the gear 14 via a gear 12 and reduction gears 13 and 14. The distal end of the connecting shaft 15 protrudes into the housing block 16 of the horizontal driving force transmission section 15C, and a bevel gear 17 is attached to the distal end. Therefore, the rotational force of the connecting shaft 15 is transmitted to the bevel gear 17.

The horizontal driving force transmission section 10C includes an arm 21 that extends horizontally from within the housing block 16 into an arm 21 that supports the wall surface detection magnetic sensor 2, below the installation position of the bevel gear 17 of the housing block 16, and has an insertion portion of the arm 21. A shaft 19 having a thread 20 formed therein is extended, and a bevel gear 18 that meshes with the bevel gear 17 is fitted onto the shaft 19. Furthermore, a shaft 19-2 is disposed below the shaft 19 and is inserted so as to pass through a cavity 16-2 formed in the housing block 16, and the entrance side of the cavity 16-2 of the shaft 19-2 is a ring. 2
2 and the protrusion 23, and the tip is connected to the arm 2 on the side opposite to the housing block 16.
It is screwed on one side. In addition, the shaft 19
-2 cavity 16-2 There is a cavity 16 on the outside of the insertion part.
The extension spring 24 housed in -2 is extrapolated and the shaft 1
9-2 presses the arm 21 in one direction.

Further, the origin detection section 10B includes a reduction gear 25 that meshes with the gear 12, a connecting shaft 26, a test piece 27, and an origin sensor 28, and includes a
1 constitutes an origin detection means for rotation.

In order to perform fillet welding of a vertical plate using the automatic welding tracing device configured as described above, the inclination information of the vertical plate is stored in advance in the recording device using NC information, and the step motor 11 is used to perform fillet welding of the vertical plate according to the inclination. Set the horizontal position of the magnetic sensor 2.

As a setting method, first, the origin is detected by moving the motor 11 in the origin detection direction, and then the horizontal position of the magnetic sensor 2 is set by moving the motor 11 in the opposite direction. With this method, the influence of the backlash in the mechanical system is limited to one direction, and the positioning accuracy of the magnetic sensor 2 is improved because it is pressed in one direction by the spring 24.

After setting the horizontal position of the magnetic sensor 2 as described above, the cylinders 6-1, 6-2, and 6-3 lower the magnetic sensors 2 and 3, and the output voltage is controlled by a control device (such as a microcomputer, not shown). The aiming position of the welding torch 1 is controlled by inputting the information to (1).

As is clear from the above description, the automatic welding tracing device according to the present invention causes the welding wall surface detection sensor to protrude and retreat laterally in response to various inclination angles of the vertical plate that is the object to be welded. By adjusting the lateral position of the weld wall detection sensor, accurate automatic fillet welding of vertical plates can be performed over a wide range of inclination.

Since the weld wall surface detection sensor has the above function, it is possible to target welding over a wide range without increasing the size of the sensor.

Furthermore, since the detection sensor can be moved in the lateral direction, there is little variation in distance from the welding arc during movement, so there are advantages such as ease of determining the cycle of intermittent correction of the detection sensor.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main part of the tracing mechanism of a conventional automatic welding device, Fig. 2 is a side view of the main part of an embodiment of the present invention, and Fig. 3 is the horizontal movement means of the wall surface detection sensor shown in Fig. 2. FIG. 4 is a sectional view of a part of the roller block. In the drawings, 1... Welding torch, 2... Wall detection sensor, 3... Floor detection sensor, 4... Roller block, 5... Bracket, 6, 6-1, 6-2,
6-3...Cylinder, 9,9-1,9-2,9-
3... Piston rod, 10... Horizontal direction drive means, 10A... Drive section, 10B... Origin detection section,
10C...Horizontal driving force transmission unit, 11...Stepping motor, 12, 13, 14, 25...Gear, 17, 18...Bevel gear, 21...Wall surface detection magnetic sensor support arm.

Claims (1)

[Scope of utility model registration request] A roller block is provided on the tip side of a welding torch supported by a bracket so as to be movable up and down along the welding torch, and a floor detection sensor is supported by the roller block and detects the floor and wall surfaces forming the corner. An automatic welding tracing device comprising: a wall surface detection sensor; and a driving means provided on the bracket and the roller block for horizontally protruding and retracting the wall surface detection sensor.