Robot module for resistance spot welding

FIELD: mechanical engineering; welding.

SUBSTANCE: invention relates to resistance spot welding device for manufacture of spacer grids of nuclear reactor fuel assemblies. Provides robot module includes welding machine, industrial robot with welding gun with electrodes installed on robot arm, control system and tables with device for fastening spacer grid to be welded. Device for fastening spacer grid to be welded is made in from of multijaw chuck with jaws enclosing perimeter of said grid. Electrodes of welding guns have spherical working surface and they are provided with cylindrical connecting element. Said connecting element is arranged in electrode holder at angle to perpendicular drawn to welded surfaces. Multijaw chuck is provided with platform with reduced height sections. Slots are made on jaws enclosing perimeter of spacer grid.

EFFECT: simplified design of electrodes and method of their fastening, increased service life of electrodes.

5 dwg

The invention relates to nuclear energy and may find application in the enterprises that produce fuel assemblies for nuclear power reactors.

The manufacture of the spacer grids of the fuel assemblies of a nuclear reactor includes the production of hexagonal rim and cell set cell margins to contain fuel elements and the consolidation of typed fields of cells in a hexagonal rim spot welding (see Bajamonti. Nuclear power reactors, 11th edition, M.: Energoatomizdat, 1990, p.44).

A known device for contact spot welding (see "Welding". Edited Gherdeina: M: mechanical engineering, 1988, p.153, RIS).

The disadvantage of this setup is the lack of geometry control during the welding process.

This control is used when welding cells of the main field with the rim (see Russian Federation Patent RU №2196668 15.05.2001, published 10.02.2003, MCI 7 WK 11/10, B25J 9/18), at which carry out the adjustment of the positioning of the electrodes, moving the electrodes parallel to the welded flat surface, double-touching the electrode to be welded cylindrical surface of the cell, and then calculate the trajectory of the electrodes passing through the midpoint of the segment between points touch electrode cylindrical surface the displacement and perpendicular to the plane of the rim.

The closest in technical essence and the achieved effect is a robotic module for resistance spot welding (see Russian Federation Patent RU №2138376 C1 from 13.05.98, published 27.09.99,, MKI 6 WK 11/10, WC 101:02, 25J 9/08) - prototype containing welding machine, industrial robot mounted with a hand welding tongs with electrodes, a control system, a table placed on it by the fixing device welded grating, made in the form mnogotonazhnogo cartridge with sponge covering the perimeter of the grid.

The disadvantages are the complexity of the design of the electrodes and the method of their attachment, small term usage, the need for frequent sweeps of the working surface with a violation of surface strength, which provides wiping device specialization module welding, since it is not possible to provide accurate chopper elements of the rim with a field of cells and their joining together.

An object of the invention is to simplify the design of the electrodes and the method of their attachment, increasing their service life due to more efficient use of the working surface, enhancing the technical capacity of the module welding by providing accurate chopper elements of the rim with a field of cells.

This technical problem is solved by the fact in robotic module for contact spot welding, containing welding machine, industrial robot mounted with a hand welding tongs with electrodes, a control system, a table placed on it by the fixing device welded grating, made in the form mnogotonazhnogo cartridge with sponge covering the perimeter of the lattice, according to the invention the electrodes of the welding tongs are spherical working surface and provided with a flanged cylindrical element located in the electrode holder at an angle to the perpendicular conducted to welded surfaces, mnogogolovy cartridge equipped with a platform for mounting the spacer grid with obnizeniem for chopper elements of the rim, and on the lips, covering the perimeter of the grid, made the slots for the approach of the electrodes to the welding place.

This set of features is new, not known from the prior art, since the execution of the electrodes of the welding tongs with a spherical working surface of the connecting cylindrical element allows you to hold the electrode at the opposite course, and rotating the electrode in the hole of the electrode holder at a certain angle, to move the contact patch spherical working surface.

The invention is illustrated by drawings.

The drawings show a robotic module for resistance spot welding/p>

figure 1 - the robotic module for resistance spot welding, General view,

figure 2 - device fixing welded grating,

figure 3 - the platform for installation of welded lattice

figure 4 - section a-a,

figure 5 - diagram of the displacement of the contact spot in the process.

The robotic module for contact spot welding includes welding machine 1, an industrial robot 2 are installed on the arm 3 of the welding tongs 4 with the electrodes 5 with a spherical working surface 6 and a flanged cylindrical member 7 placed in the electrode holder 8 at an angle 9 to the perpendicular line 10, is lowered to the welded surfaces 11, the angle 12 of rotation of the electrode 5 in the hole of the electrode holder 8, the contact area 13, the control system 14, table 15 placed on it by the fixing device 16 to be welded grating 17, made in the form mnogotonazhnogo cartridge 18 with the jaws 19, covering the perimeter grille 17, made with slots 20 for the approach of electrodes 5 to welded surfaces 11, equipped with a platform 21 for installation of the welded grating 17 with obnizeniem 22 for chopper elements of the rim 23 and the cells 24 of 25 vertical and horizontal 26.

The robotic module for resistance spot welding is as follows.

Pre-typed field discontinious the fifth grid 17 is mounted on the platform 21, jaws 19 grille 17 is crimped, the electrode 5 is inserted into the elds of application 8 and a special program is held welding cells 24 between them. Before welding of elements of the rim 23 to the cells 24 between them is Bashirova. The elements of the rim 23 are placed in omnigene 22 of the platform 21 and base elements of the rim 23 relative to the cells 24 of 25 vertical and horizontal 26. After entering a certain number of welded points of the electrodes 5 are deploying in the hole of the electrode holder 8 on the corner of 12, working the spherical surface 6 is rotated, the contact 13 is displaced from the working area to the side, and with welded surfaces 11 compression electrode 5 contacts the intact portion of the spherical surface 6.

The robotic module for contact spot welding can simplify the design of the electrodes and method of attaching them to increase their service life, allows the welding fields of cells with the rim, ensuring accurate chopper elements of the rim relative to the margin of the cell.

The robotic module for resistance spot welding, containing welding machine, industrial robot mounted with a hand welding tongs with electrodes, a control system, a table placed on it by the fixing device welded the spacer grid, made in the form of Mogok lutcavage Chuck with jaws, covering the perimeter of the mentioned lattice, characterized in that the electrodes of the welding tongs are made with a spherical working surface and equipped with the connecting element has a cylindrical shape, located in the electrode holder at an angle to the perpendicular, towards welded surfaces, mnogogolovy cartridge equipped with a platform for her obnizeniem and sponges covering the perimeter of the spacer grid, made grooves.