JPH0638633Y2 - Positioner for welding steel joints - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a positioner for welding a steel joint, and more specifically, a reliable safety against an electrical failure of an automatic control robot welding device numerically controlled by a computer. It relates to devices that have taken measures.

[Prior Art] The operation of a positioner for welding a steel joint has generally been conventionally performed manually, but recently it has been attempted to be performed by remote automatic control with the development and spread of computer technology.

When handling objects of so-called high-mix low-volume production, where the size and shape of each product are almost the same, such as the steel frame joint of a building, it is not possible to perform uniform welding with a teaching robot. On the other hand, however, the steel frame joint has the characteristic that the process can be easily determined by three-dimensional rectangular coordinates, and a technique for automatically welding various joints using a computer has been developed.

[Problems to be solved by the device]

Under such circumstances, it is an essential requirement for the steel-frame joint welding apparatus to reliably protect the computer from the welding power source.

Since the welding power source and the body to be welded are connected by a ground cable, the welding current does not flow out of the system path in a normal state.

However, if the earth cable is forgotten to be connected, or if there is a connection failure or damage, the welding current may flow into the ground using the positioner as a conductor. This may cause noise and cause the computer to run away, causing the positioner to malfunction.

The present invention intends to provide a positioner for welding a steel frame joint of a computer numerical control automatic control robot welding device which completely prevents such a danger.

[Means for Solving the Problems]

The present invention, in a positioner for welding steel joints in a computer numerical control automatic control robot welding device, uses an insulating material for part of the bearing and coupling of the positioner to prevent malfunction of the control device due to leakage of welding current. In addition, an insulating material is interposed between a mounting portion of a rotary bearing that supports the object to be welded to a frame and a coupling portion of a drive shaft coupling that rotates the object to be welded, and a positioner of the object to be welded and a welding device is provided. Is characterized by being electrically separated.

[Action]

According to the device of the present invention, the welding power source does not leak to the computer even if there is a contact failure of the ground cable, and the computer is protected from abnormality without causing any abnormality.

〔Example〕

FIG. 3 is an elevation view of an example of a positioner of a steel frame joint automatic welding device.

Both ends of the welded body 21 are supported by a non-drive side jig 22 supported by a non-drive side bearing 24 and a drive side jig 23 supported by a drive side bearing 25. The drive-side jig 23 includes a drive motor 30 via a slide coupling 27, a drive shaft 28, and a gear 29.
Is rotated by.

These are arranged on a common bed 31 via pedestals 32, 33 and the like, and an encoder 34, a controller 35, etc. are placed on the common bed 31.

FIG. 1 shows the bearing 24 or 25 of the positioner for welding a steel joint of the present invention, and FIG. 2 shows the structure of the mounting portion of the coupling bolt 9 of the coupling 27. FIG. 1 shows the mounting state of the bearings 24 or 25 placed on the frame 1,
An electrically insulating material, for example, an insulating laying plate 4 of Bakelite is interposed between the gantry 1 and the base 3 of the bearing 24 or 25, and the insulating sleeve 6 and the head (or nut) of the bolt 5 are attached to the mounting holes of the bearing mounting bolts 5. An insulating washer 7 is interposed on the contact surface. Therefore, the object to be welded 21 and the gantry 1 are electrically insulated.

FIG. 2 shows that the coupling bolt 9 of the coupling 27 is electrically insulated and mounted by the insulating sleeve 10 and the insulating washer 11. When the coupling 27 is coupled to the driven side coupling, the object to be welded is 21 and the body of the coupling 27 are electrically separated.

[Effect of device]

According to the present invention, since the welded body attached to the steel frame position welding positioner and the positioner are electrically and completely separated and insulated by the bearing and the coupling portion, no welding leakage current is generated during welding. Since it does not adversely affect the computer, automatic welding can be performed safely and reliably.

[Brief description of drawings]

FIG. 1 is a structural view of a bearing mounting portion showing an example of an insulating structure according to an embodiment of the present invention, FIG. 2 is a structural view of a coupling bolt mounting structure, (a) is a side view, and (b) is its BB arrow. Perspective view, third
The figure is an elevation view of a positioner for welding a steel joint. 1 ... Stand, 3 ... Base 4 ... Insulation base plate, 5,9 ... Bolt 6,10 ... Insulation sleeve 7,11 ... Insulation washer 24,25 ... Bearing, 27 ... Coupling

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. In a positioner for welding a steel frame joint in a computer numerical control automatic control robot welding device, an attachment portion of a rotary bearing for supporting an object to be welded to a mount and a coupling of a drive shaft coupling for rotating the object to be welded. A steel frame joint welding positioner, wherein an insulating material that electrically insulates an object to be welded and a positioner of a welding device is interposed in the portion.