SU1593872A1 - Apparatus for forming the root of circumferential weld - Google Patents

Abstract

The invention relates to the welding industry and can be used for welding annular joints of pipes with the reverse formation of the root of the seam. The purpose of the invention is to reduce the complexity of service. The device for forming the root of the annular seam contains two toroidal inflatable chambers 7, disks 8 fixed on chambers 7, a bunker 1 mounted by means of axes 9 on disks 8 rotatably. In the cavity of the hopper 1 there is a casing with a hole on the surface of the hopper, screw 3 placed therein, and rotational drive 4 of screw 3, which is kinematically connected via electromagnetic clutch 12 with gear wheel 10 placed on one of the disks 8. In the cavity of bunker 1 compressor for filling toroidal chambers. The goal is achieved by removing the flux cushion after welding without removing the device from the work area. 1 hp f-ly, 3 ill.

Description

16 And 7/15 FigL

The invention relates to the welding industry and can be used for welding annular joints of pipes or other cylindrical parts with the reverse formation of the root of the seam.

The purpose of the invention is to reduce the servicing labor intensity by removing the flux cushion after welding without removing the device from the working area.

FIG. 1 shows a device, side view; in fig. 2 - the same, end view; in fig. 3 - the same, top view.

The device consists of a hopper 1, which has a rigid structure, such as metal, and is a cylindrical container. In the bunker 1 there is a hole located on its cylindrical surface to which it is rigidly attached, for example, welded, a casing 2 which is directed inside the bunker 1. Inside the casing 2 a screw 3 is installed coaxially with the cantilever end of which is flush with the cylindrical surface of the bunker 1 and it is connected to another by a rotational drive 4, also located inside the hopper 1, on the side opposite to the hole on the cylindrical surface of the hopper 1. The internal volume of the hopper 1 is filled with flux 5. So that the flux 5 is not fell on the rotational drive 4, the latter is closed by the partition 6. The casing 2 has a length slightly shorter than the screw 3, therefore between the partition 6 and the casing 2 there is a gap for flux 5. The toroidal chambers 7 are fixed on the both sides of the bunker 1 The discs 8. In the centers of the discs 8 there are axes 9 on which a hopper 1 is rotatably mounted. A gear 10 is fixed to one of the discs 8, the toothed crown of which is connected to the bevel gear 11 through an electromagnetic clutch 12 with a 4 rotation drive. One of the toroidal chambers 7 is connected to the pneumatic system 13. In addition, the toroidal chambers 7 are interconnected by an air duct 14 through a pressure valve 15. The inner surfaces of the toroidal chambers 7 are attached, for example, elastic pads 16 are glued, which rest on the cylindrical surface of the bunker 1, preventing the flux 5 from spilling into the gaps between the disks 8 and the end walls of the bunker 1. Thus, the outer cylindrical surface of the bunker 1, elastic pads 16 and The toroidal chambers 7 form a flute channel chute into which the flux 5 is fed by a rotating screw 3 from the internal volume of the hopper 1.

The device works as follows. In the initial position, the air in the toroidal chambers 7 is absent, the flux 5 is inside the bunker 1. Before using the device is deployed so that the opening in the body of the bunker 1 is located

from above. The device is then inserted into the cylindrical billet 17, half-buried in it, and through the pneumatic system 13 the toroidal chamber 7, which is inside the billet 17, is filled with air. This allows the device to be fixed relative to the billet end 17. Then the second billet 18 is docked to the first, forming an annular joint, and, having increased the air pressure in the gas system 13, the valve 15 is triggered (the valve 15 is set to a certain pressure), which allows access to the duct 14 through which air is filled th second toroidal chamber 7. This causes equalization vanie joint and fixing workpieces 17 and 18 relative to one another.

Turning on the actuator 4, they begin to rotate the Screw 3, which moves the flux 5 along the casing 2 upwards, the flux enters the outer surface of the bunker 1 through the opening. Because the hopper 1 has an outer cylindrical surface, the flux 5 is poured downwards, filling the volume of the flux feeder. The rotation of the screw 3 is performed until the cushion (flute chute 5) is completely filled with the flux 5. Further rotation of the screw 3 causes additional flux 5 to flow into the feeder, which allows it to be sealed due to the fact that the flux pressure 5, as a bulk material, it is leveled throughout the volume of the sheet.

After the formation of the flux feeder is completed, welding of the annular joint begins. After welding, the drive 4 is turned on again, but in the opposite direction. In this case, the rotating screw 3 moves 35 flux 5 inside the hopper 1 from the flux cushion. When the partial flux 5 is removed, therefore, the remaining part is no longer compacted, the electromagnetic clutch 12 is turned on. In this case, the bevel gear 11 begins to rotate, interacting with the gear wheel 10. Since the gear wheel is stationary, then the bunker 1 rotates on the axis x 9 When the bunker 1 rotates, the hole for collecting flux 5 is at the bottom, which allows for further 45 cleaning of the flux 5. When the main mass of flux 5 is removed, they begin to release the air from the toroidal chambers 7. The hopper 1 under its own weight lowers It is based on the remaining flux 5, which is removed by the rotating screw 33 from the flux feeder. When all the flux 5 is retracted into the internal cavity of the hopper 1, the rotation of the screw 3 is stopped, the device is removed from the welded workpieces 17 and 18 and reused, while prior to re-use no preparatory work is needed to restore the device.

The device allows for the rapid formation and removal of a flux cushion.

always have a supply of flux around the flux cushion and use the flux efficiently, while the device is minimal and compact. In addition, the proposed device forms a cushion along the entire length of the joint and rotates together with the product, therefore the formation of defects is eliminated, the ingress of slag into the welding zone is excluded.

The amount of flux 5 in the hopper 1 is determined by its volume. To increase the content of the flux 5, you can increase the width of the hopper 1 or its end walls made of elastic material, such as technical rubber.

If the hopper 1 is large in size (for example, for welding cylindrical billets of large diameter), a compressor can be placed in the cavity of the hopper under the partition 6 next to the rotation mechanism 4 to fill the toroidal chambers 7 with compressed air. In this case, the device can also be used in the absence of a pneumatic system 13, i.e., in non-stationary conditions.

There are no obstacles to the rotation of the device together with the workpieces 17 and 18 during the welding process: it is connected with the external environment only by a flexible electrical cable and a pneumatic hose.

Slag crusts, having a disproportionately larger volume than the flux pellets 5, always remain on top of the flux 5 (small granules spill down faster), so before the flux 5 is completely cleaned, they do not fall into the bunker 1 and are removed after the device is removed.

Example. The bunker is made of sheet steel with a thickness of 5-6 mm and has a diameter of 600 mm and a width of 400 mm. The outer cylindrical surface has a low roughness. Toroidal chambers are made of rubberized fire hoses with a diameter of 110 mm. The discs have a diameter of 600 mm and are made of steel with a thickness of 8-10 mm. The gap between the discs and the drum is 10-20 mm. Rubber strips of technical rubber 5 mm thick are glued to toroidal chambers with BF-88 glue. The free ends of the pads rest on the drum to form an overlap of 40-50 mm in size. In place of the overlap gaskets greased with technical grease. The inner diameter of the nozzle is 80 mm and it is made of steel with a thickness of 3 mm. In the nozzle is installed a screw with a diameter of 78 mm. The casing is made of sheet steel with a thickness of 1.5-2.0 mm. Any known gear motor is used as a rotation drive, thick-walled rubber pipes are used as an air duct, and a solenoid solenoid valve of any known design is used as a pressure valve.

There is a 20 mm gap between the cantilever end of the nozzle and the casing.

flux. The fixed gear on the disk has a diameter of 500 mm, and the gears of a bevel gear have a diameter of 100 mm. The electromagnetic clutch is used in any known construction. A device made according to the specified dimensions can be used for welding workpieces with a diameter of 640 to 820 mm, has a maximum volume of a flux cushion of 77100 cm, the supply of flux in the drum is 113100 cm. Considering

on average, about 200 cm of the flux is converted and partially spilled into the slag, the device can be used about 180 times without the pressure of the flux into the drum.

The application of the proposed device provides reusable use of a flux cushion and economical consumption of flux due to its cleaning after welding the joint inside the bunker, protecting the flux from interacting with atmospheric moisture due to the fact that it is inside the bunker, compactness, since the flux and its movement drive in the bunker, when placed in the compressor bunker, the possibility of using in non-stationary conditions, the absence of any third-party flux feeder, since the latter is constant o in the device, ease of operation due to the fact that there are no difficulties in controlling the device, not

it is necessary to remove the flux, the ability to clean the flux when welding non-rotary joints due to the fact that the bunker has the ability to rotate on the axes relative to the discs.

35

Claims (2)

Invention Formula . An apparatus for forming a root annular root, containing a mechanism for mounting a flux head inside the product, a flux head mounted on an axis c 0 rotatable, including a bunker and mounted in it of a screw placed in a casing, with a length of less than the length of the screw, with an outlet, and a screw rotation drive placed on the side opposite to the outlet, in order to reduce the service intensity by removing the flux sheet after welding without removing the device from the working area, the mechanism for mounting the flux head is 1} in the form of two toroidal inflatable chambers, 0 placed on opposite sides of the auger, disks fixed on the chambers, and a gear wheel, kinematically connected with the rotation drive of the auger and mounted on one of the disks, the bunker is located between the chambers and has a cavity in it five which is installed drive vrazhen screw. 2. The device according to claim 1, characterized in that it is provided with a compressor for filling the toroidal chambers with compressed air located in the cavity of the hopper, and the end walls of the hopper are made of elastic material. FIG. g Fig.d 75 /;