MACHINE FOR FLASH-BUTT WELDING OF RAILS

Abstract

Application of the machine for flash-butt welding of rails with one rod, which connects two tong-type clamping devices is widening greatly the functional capabilities at its service, both in welding of separate rails and also in repair of rail tracks under the field conditions and in hard-to-reach places such as railway switches and frogs, the underground tracks, rails, which are laid side by side at a close distance, etc., not changing the optimum process and quality of the welded joints.

Claims

1. A machine for the flash-butt welding of rails, comprising: A welding current power source; two tong-type clamping devices electrically isolated one from another, each including a pair of double-arm levers with a mechanism of synchronizing, moreover, each pair of double-arm levers is hinge connected by one ends to a hydraulic cylinder of clamping , and at the opposite ends of levers the clamping and current-carrying jaws are fixed; the hydraulic cylinder of displacement (flashing and upsetting) of the tong-type clamping devices , which comprises a casing and rod moreover, on the casing (8) the first tong-type clamping device is fixed, and on the rod the second tong-type clamping device is fixed, providing the possibility of reciprocal movement of one relative to another along axis of the hydraulic cylinder of displacement, wherein the hydraulic cylinder of displacement is arranged in a vertical plane of symmetry of pair of double-arm levers of each tong-type clamping device.

2. The machine of claim 1, wherein the pairs of double-arm levers of each tong-type clamping device are mounted so that to provide the possibility of turning of one lever relative to another one around the axis of the hydraulic cylinder of displacement.

3. The machine of claim 2, wherein the dowels are applied additionally, which prevent through mechanisms of synchronizing the turning of tong-type clamping devices one relative another around the common axis of rotation of double-arm levers.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The description below refers to the accompanying drawings, of which:

[0011] FIG. 1 presents the general view of the machine;

[0012] FIG. 2 presents the view of the machine on the side of cylinder of displacement; and

[0013] FIG. 3 shows the longitudinal section of the machine.

DETAILED DESCRIPTION OF AN ILLUSTRATIVE EMBODIMENT

[0014] Improvement of known designs of the machines for the flash-butt welding of rails by reduction of numbers of rods, connecting the tong-type clamping devices between themselves, from three to one. The hydraulic cylinder of displacement of tong-type clamping devices relative one to another, comprising a casing and rod, moreover, pairs of double-arm levers of each tong-type clamping device are mounted on the casing and rod of the hydraulic cylinder of displacement providing the possibility of turning of one lever relative to another around the axis of the hydraulic cylinder of displacement which is located in vertical plane of symmetry of pairs of double-arm levers of each tong-type clamping device. Dowels are applied additionally which prevent through mechanisms of synchronizing the turning of one tong-type clamping device relative to another one around the common axis of rotation of double-arm levers.

[0015] The machine for the flash-butt welding of rails comprises two tong-type clamping devices 1 and 2, electrically isolated one from another, each of which includes a pair of double-arm levers 3 and 4 with a mechanism of synchronizing 10, moreover, each pair of the double-arm levers 3 and 4 is hinge connected by one ends to a hydraulic cylinder of clamping 13, and at the opposite ends of the levers the clamping 14 and current-carrying 15 jaws are fixed, which are manufactured by the profile of rail webs being welded. The hydraulic cylinder 6 of displacement of the tong-type clamping devices 1 and 2 one relative another, which consists of a casing 8 and rod 7, moreover, the first tong-type clamping device 1 is fixed on the casing 8, and another tong-type clamping device 2 is fixed on the rod 7 providing the feasibility of reciprocal movement of one relative another along the common axis, which was formed by a rod 7 axis and axis of casing 8. The double-arm levers 3 and 4 of each pair of the tong-type clamping devices 1 and 2 are mounted on the casing 8 and rod 7 of hydraulic cylinder of displacement 6 with a feasibility of turning of one lever 3 relative to another lever 4 around the common axis of rotation, which was formed by the axis of rod 7 and axis of casing 8 of hydraulic cylinder of displacement of one clamping device relative to another one along the common axis. Additionally, dowels 11 and 12 are applied, which through the mechanisms of synchronizing 10 prevent the tong-type clamping devices 1 and 2 from turning relative one another around the common axis of rotation of double-arm levers 3 and 4, which was formed by rod 7 axis and casing 8 axis of hydraulic cylinder of displacement 6. The machine has a single welding current source, which includes two welding transformers 16, which electrically connected in parallel and built-in into the hollow double-arm levers 3 and 4 of one of two tong-type clamping devices. The welding current to the clamping current-carrying jaws 15 is supplied by rigid 17 and flexible 18 current carrying jumpers.

[0016] The operation of the rail welding machine with one rod, which connects two tong-type clamping devices can be described as follows. In the initial position before clamping the rail ends being welded, the both tong-type clamping devices 1 and 2 are brought apart, and their double-arm levers 3 and 4 are open. A hydraulic valve of clamping is in a neutral position (hydraulic scheme of the machine is not given). The machine by a suspension 20 is lowered to the prepared rail ends to be welded and oriented by catchers 19 along their axes. The command is given from the programming block for rails clamping, a hydraulic valve is transferred into position Clamping. Oil from the oil pump is supplied by pipelines to the hydraulic cylinders of clamping 13. Under oil pressure the hydraulic cylinders are brought apart, turning the double-arm levers around a common axis of rotation and gradually the operation for clamping of rails by their webs is performed by clamping 14 and current-carrying 15 jaws. After reaching the operating pressure in hydraulic cylinders of clamping 13 the command is given from the programming block for rail welding. After completion of the welding process the command is given for rail unclamping, the hydraulic valve is transferred into position Open. The clamping cylinders 13 are brought together rotating the double-arm levers 3 and 4 around the common axis and release the welded rail from clamping 14 and current-carrying 15 jaws. The command is given for bringing apart of tong-type clamping devices, the reverse hydraulic valve is transferred into position Bringing apart the oil is supplied into cavity of hydraulic cylinder of displacement 6 and tong-type clamping devices are brought apart into the initial position. The machine is ready for fulfillment of the next cycle of rail welding.

[0017] The application of the machine for flash-butt welding of rails with one rod, which connects two tong-type clamping devices widens greatly the functional capabilities in its service, both in welding of separate rails and also in repair of rail tracks under the field conditions and in hard-to-reach places, in particular railway switches and frogs, the underground tracks, rails, which are laid side by side at a close distance, etc., not changing the optimum process and quality of welded joints.