SU965562A1 - Apparatus for expanding tubes - Google Patents

Description

(54) DEVICE FOR DISTRIBUTING PIPES

one

This invention relates to a change in the diameter of a pipe by pressure treatment.

A device for dispensing pipes is known, comprising a mandrel displacement mechanism mounted on the base and an axial support node for the rear end of the pipe with a hydraulic cylinder 1.

However, in this device there are no means of fixing the front end. pipe, which reduces the permissible degree of deformation.

The purpose of the invention is to increase the degree of deformation in a single pass.

The goal is achieved by the fact that the device, which contains a core-mounted movement mechanism for the mandrel and an axial support assembly for the rear end of the pipe with a hydraulic cylinder, is equipped with a clamp assembly for the front end of the pipe with a hydraulic cylinder drive, the working cavity of which is connected to the working cylinder of the hydraulic support cylinder.

The drawing shows the device, a longitudinal section.

The device contains a mandrel 1 with a mechanism for its movement (not shown), a node axially supporting the rear end of the pipe

with a hydraulic cylinder 2 installed in guides 3 and provided with a stop 4 and a pressure screw 5. The front end of the pipe with flanged or welded flange is fixed by a clamp assembly including clamp 6 and hydraulic cylinder 7. There is a stop 8 for clamping the flange of the pipe on clamp 6.

The cavities of the hydraulic cylinders 2 and 7 are interconnected by pipelines 9.

The device works as follows 10 times.

A pipe 10 with a flange flanged or welded to the end is positioned at the stop 8 and pressed by the clamp 6. The pressure screw 5 causes the hydraulic cylinder 2 to be guided through the guides 3 to the rear end of the pipe to be distributed until it is fully pressed against the stop 4. Dorn 1 is inserted into the pipe and the dispensing process begins In this case, pressure cylinders automatically equalize in hydraulic cylinders 2 and 7 connected by pipelines.

When dispensing a pipe, its length decreases due to the fact that part of the fluid from the hydraulic cylinder 7. automatically moves to the hydraulic cylinder 2, the overpressure on the front and its rear ends on the side of the stops remain constant. Maintaining a constant pressure in the hydraulic cylinders and, accordingly, the magnitude of the axial forces perceived by the pipe ends, is proportional to the area of the hydraulic cylinders. Thus, a proportional redistribution of the axial deformation forces at the ends of the pipe makes it possible to increase the deformation in a single pass of the mandrel and to ensure the possibility of distributing long pipes.

The proposed pipe dispenser, as compared to the known ones, provides an increase in the degree of deformation in a single pass of the mandrel and allows the distribution of long pipes due to the redistribution of axial forces at the ends of the pipe.

Claims (1)

Invention Formula A device for dispensing pipes, comprising a mandrel-mounted movement mechanism and an axial support assembly for the rear end of the pipe with a hydraulic cylinder, characterized in that, in order to increase the degree of deformation in a single pass, it is equipped with a hydraulic cylinder-driven clamp assembly, the working cavity which is connected with the working cavity of the hydraulic cylinder backwater. Sources of information taken into account in the examination 1. USSR author's certificate No. 531603, cl. B 21 D 41/02, 12.12.73 (prototype).