CS243301B1 - Method of openings' leak-proof blinding and jig for application of this method - Google Patents

Abstract

Pressure-tight blind hole fixture consists of a blanking pin, which after pressing into the appropriate blind the opening is distinguished by the expanding mandrel thus ensuring the blindness is pressure-tight hole.

Description

(54) A method of pressure-tight hole blanking and a jig for carrying out the method

The pressure-tight blind hole preparation consists of a blind pin which, after being pressed into the respective blind hole, is pressed by an expanding mandrel to ensure the pressure-tightness of the blind hole.

GIANT. 3

243301 2

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pressure-tight plugging of openings, in particular leaking tubes of high pressure heater bundles, and to a preparation for carrying out the method.

The hitherto used technology for repairing leaks of high-pressure heaters by pushing the smooth cone pin into the hole of the respective leaking pipe did not guarantee a perfectly tight blank. Several modifications of the method have been used, but none have proved to be successful because the blind hole cannot be perfectly machined.

The disadvantages of the technology used hitherto are overcome by the method and the pressure-tight blanking device according to the invention. The fixture consists of a blanking plug made of a plastic material similar in composition to that of the blind hole.

The shape is formed from an initial smooth cylindrical part guiding, which passes to the sealing conical widening serrated part terminated by a collar, in whose shoulder the conical expansion part is terminated.

An expanding mandrel of hard solid material is pressed into this, which consists of a spherical surface of a smaller and a spherical surface of a larger and cylindrical portion having a larger diameter than the spherical surfaces.

The pressure-tight blanking of the leak hole is achieved by pressing a blanking plug, which is provided with a sliding lubricating layer, into the conical reamer-cleaned blind hole. An expanding mandrel, also provided with a sliding lubricating layer, is pressed into the blanking plug.

This type of blinding makes it possible to reliably blind even hard to reach places in the depth of the water chamber.

An exemplary embodiment of the invention is shown in the accompanying drawings, in which Fig. 1 shows a schematic cross-section of a blanking plug. The blind plug hole 7 is made of a plastics material similar in composition to that of the blind plug hole 6. The blind plug pin 7 is made of a plastic material of similar composition to that of the blind plug plug 6.

The surface of the blind pin 1 is smooth in the cylindrical portion T, the diameter of the blind pin 6 is smaller than the diameter of the blind hole 6. The knurled portion 13 of the blind pin 2 has a larger diameter than the blind hole 6.

This expands conically. Fig. 4 shows a detail of Fig. 1. Fig. 2 shows a cross-section of an expanding mandrel 2 made of a hard solid material. The surface has a spherical surface 3 ^{and a} spherical surface 4 of unequal graded diameter and terminates in a cylindrical portion 5.

FIG. 3 shows an overall compression scheme. The blind hole 6 is cleaned with a tapered reamer of a diameter corresponding to the blind hole 6. A blanking plug 1 of elastic material is pressed into the cleaned blind hole. '’'

An expanding mandrel 2 of the corresponding size of a hard material is pressed into the conical bore of the blanking pin, which distinguishes the groove surface of the blanking pin 1, thereby reliably displacing the blank.

Claims (3)

SUBJECT OF THE INVENTION Method of pressure-tight hole blanking, characterized in that a blanking plug (1) provided with a sliding lubricating layer is pressed into a tapered reamed blank (5) and a blanking pin (1), also provided with a sliding plug, is pressed into the blanking plug (1). lubricating layer. 2. A pressure-tight blanking device for carrying out the method according to claim 1, characterized in that it consists of a blanking pin (1) formed of an initial smooth cylindrical part of the guide (7), passing into a sealing conical widening of the knurled part (8). terminated by a collar (9), in which the conical expansion part (10) is terminated, into which the expanding mandrel (2), which consists of a spherical surface smaller (3) and a spherical surface larger (4), is pressed and terminated by a cylindrical part (5) having a larger diameter than the spherical surfaces (3, 4). 3. The pressure-tight blanking device according to claim 2, characterized in that the blanking plug (1) is of the same material composition as the blanking hole (6).