RU80522U1 - DEVICE FOR REMOVING DEFORMATIONS OF TYPE OF DENTS OF HOLLOW SHAFT - Google Patents

Abstract

The utility model relates to the field of mechanical engineering and relates to the elimination of deformations of products such as dents, mainly long hollow shafts. The objective of the utility model is to increase the efficiency of repair of shaft defects and reduce its complexity. To solve this problem, a device for eliminating deformations such as dents of hollow shafts is proposed, which is a mechano-hydraulic device installed inside the shaft and a heating device installed outside the shaft, the mechano-hydraulic device consists of a hollow rod filled with a working fluid, for example, oil connected to a cylinder made integrally with the lower expansion block, which includes the piston, made integral with the upper expansion block, mounted coaxially with the lower expansion th block.

Description

The utility model relates to the field of mechanical engineering and relates to the elimination of deformations of products such as dents, mainly long hollow shafts.

A known method of repairing pipes and a device for this (patent application N 92003465/29, class F16L 55/16, op. 02.111995, BI N 8), which consists in forcefully pressing the clamping element to the pipeline, sealing the interface of the clamping element and the pipeline moreover, the force pressing of the clamping element to the pipeline is carried out by heating it, and then cooling to a certain temperature. In the device containing the clamping element, the mechanism of pressing it to the pipeline and a sealing gasket, the pressing element and the power pressing element are made in the form of a cylindrical shell with a diameter larger than the diameter of the pipeline, provided with an insulating layer on the outside, an inlet pipe, and on the inside and lateral longitudinal ends sealing gasket.

The device is designed to eliminate deformation on the outer surface of the pipe, but does not allow to eliminate dents in the pipe body.

The closest in technical essence to the claimed is a method of repairing pipeline defects (RF patent No. 213 3401, IPC 6 F16L 55/168, op. 1997.06.25 - prototype), which consists in the fact that the clamping elements, their tips are placed on the outer surface of the pipeline placed on dents or bulges of the pipe wall. Tips on dents are welded to the pipe. Defective sections of the pipeline are heated to a predetermined temperature, pressure elements act on the defective sections and restore the shape of the pipeline. After cooling the walls of the latter, the welds are cut off, freeing the tips.

However, this technical solution, aimed at eliminating defects in the pipeline, cannot qualitatively form the inner surface of the hollow shaft, for example, the drive shaft of the traction drive of the TEP70 diesel locomotive.

The task at hand is to improve the quality of repair of hollow shafts and reduce the complexity of repair.

To solve this problem, a device for eliminating deformations such as dents of hollow shafts is proposed, which is a mechano-hydraulic device installed inside the shaft and a heating device installed outside the shaft, the mechano-hydraulic device consists of a hollow rod filled with a working fluid, for example, oil connected to a cylinder made integrally with the lower expansion block, which includes the piston, made integral with the upper expansion block, mounted coaxially with the lower expansion th block.

Pads can be made of cast iron, steel.

Structurally, the lower block can be made integral with the cylinder or separately and connected, for example by welding. The upper pads can also be made integrally with the piston or separately.

As a hydraulic medium can be such as hydroplast, oil. The device provides a full restoration of the geometry of the hollow shaft in a wide range of geometrical dimensions (shaft diameter, its length) and eliminates the rejection of products with dents.

To prevent oil leaks, rubber o-rings are installed on the piston.

Figure 1 presents the image of the inventive device, General view, in section. Figure 2 is a section aa of figure 1.

A device for eliminating deformations such as dents in hollow shafts is a mechano-hydraulic device 2 installed inside the shaft 1 and a heating device 3 installed on the outside of the shaft, the mechano-hydraulic device consists of a hollow rod 4 filled with a working fluid 5, for example, oil connected to a cylinder 6 made integrally with the lower expansion block 7, which includes the piston 8, made integral with the upper expansion block 9, mounted coaxially with the lower expansion block.

The device operates as follows. Dents were eliminated on the surface of the hollow shaft of the traction drive of the TEP70 diesel locomotive with a length of 1445 mm and a diameter of 264 mm, the shaft material was steel 10.

A device consisting of 2 pads mounted on a hollow rod filled with medium - industrial oil 30 was put into a hollow shaft.

When the screw is rotated at the inlet of the hollow rod by means of a hydraulic medium - industrial oil 30, pressure (force) is transferred from the screw to the movable forming block.

From a cylinder mounted on the opposite end of the rod, oil transfers pressure to the piston of the movable block.

The lower fixed block is made integral with the hydraulic booster cylinder.

The upper movable block is integral with the piston.

At the same time, from the outside, the deformed straightened pipe in the dent zone is heated to a temperature of 750-800 ° C by a gas burner. The material in this zone acquires plastic properties. And under the influence of the forming element - forming blocks, the pipe takes on its original shape.

Claims (1)

A device for eliminating deformations such as dents in hollow shafts, which is a mechanohydraulic device installed inside the shaft and a heating device installed on the outside of the shaft, the mechanohydraulic device consists of a hollow rod filled with a working fluid, for example, oil, connected to a cylinder integral with the lower expansion block, in which includes a piston integral with the upper expansion block mounted coaxially with the lower expansion block.