SU1761342A1 - Blast chuck - Google Patents

Abstract

Use: in the field of mechanical engineering for pressing pipes in the holes of the tube sheets of heat exchangers by means of an explosion. Essence: in a cartridge with a detachable explosive case, inside of which there is a charge of explosive, in contact with one end of the detonating cord, charge contact and de-. The toning cord is carried out in the central part of the charge, and the mass of the body is determined from the condition M 10 Rev Rt, the invention relates to mechanical engineering, in order to press the pipes into the holes of the tube sheets of heat exchanging apparatuses by means of an explosion. An explosive cartridge is known, comprising a housing in the form of a centering sleeve, inside of which an explosive charge is placed, and a detonator. where And is the mass of the body of the cartridge, ha is the mass of the charge of the explosive, Qgg is the heat of explosion of a charge, rd is the heat of explosion of ammonite. The explosive cartridge is installed in the pipe 5 to be pressed in, which is placed in the tube sheet 6. The explosive charge 2 in the cartridge case is undermined in the central zone by means of the detonating cord 3. Due to the massiveness of the parts 1A and 1B constituting the case, their speed The spread is much less than the speed of the explosive conversion of charge into explosion products, the scattering of which is part of the body parts. This makes it possible to prolong the action time of the pressure pulse on the wall of the pipe being fixed and to prevent a sharp drop in pressure at the ends of charge 2 after detonation. The initiation of charge 2 at its center allows, at a given mass of charge m, to increase the pulse of the explosion pressure by a factor of two. As a result, pipes are fastened in the openings of tube sheets, including material thickness, comparable to the diameter of the pipe, with high quality and reliability. 1 il. A disadvantage of the known cartridge is its limited use due to the fact that the detonators contain liners in their design, which fly apart during the explosion, which leads to damage to the inner surface of the pipe. (L S “h o SA”) N3

Description

J1

An explosive cartridge is known which contains a detachable body within which is placed an explosive charge and a detonating cord, one end of which is placed in contact with an explosive charge.

However, the use of known cartridges is limited due to their use for attaching pipes whose diameter is much smaller than the thickness of the tube sheet.

The purpose of the invention is to expand the field of application of explosive cartridges.

The goal is achieved by the fact that an explosive cartridge containing a detachable body within which an explosive charge is placed and a detonating cord, one end of which is installed in contact with an explosive charge, according to the invention, the contact of the detonating cord end with an explosive charge central

parts of the latter, and the mass of the body of the cartridge is determined from the condition

n y-ai.

t,

(ABOUT

where is m ta

 9ft

Q On

the mass of the shell of the operating charge of the explosive; the heat of explosion of the working charge of an explosive, the heat of explosion of ammonite, the drawing shows a longitudinal section of the explosive cartridge.

The case of the explosive cartridge is made of two equal parts by weight 1A and 1B. Inside the case there is a working charge 2 in the form of a cylinder, for example, from ammonite No. 6 ЖВ. The mass of the charge of ha and the body of the cartridges is determined from condition 1. To initiate working charge 2, a detonating cord 3 is applied, one end of which is installed in contact with the charge of the explosive in its central part. The sleeve 4 is made integral with part 1A and prevents premature initiation by the side surface of the detonio

breaking cord

five

3 working charges 2. The blast cartridge is installed in the tube 5, which is placed in the tube sheet 6.

A cartridge with an explosive charge is inserted into the fastened pipe 5 so that the center of the working charge 2 (section S) coincides with the center of the pipe pressing section and is blown up by the detonating cord 3, while the initiation of the working charge 2 occurs in its center (in section S). Due to the massiveness of parts 1A and 1B of the body of the cartridge, their speed is approximately two orders of magnitude less than the speed of the explosive, which makes it possible to prolong the action time of the pressure pulse on the wall of the fixed pipe and prevent a sharp drop in the pressure of the explosion on the ends of charge 2 after detonation.

The use of the proposed cartridge allows it to expand its area of application and allows it to be used for fastening pipes in tube grids whose thickness is comparable to the diameter of the pipes.

0 Formula of invention

An explosive cartridge containing a split housing within which an explosive charge is placed and a detonating cord, one end of which is in contact with an explosive charge, characterized in that, in order to expand the field of use, the contact of the end of the detonating cord with an explosive charge substances carried out in the central part of the latter, and the mass of the body of the cartridge is determined from the condition

S

0

45

.

ha

0

where M m Qee - Q mass of the body of the cartridge; mass of explosive charge, heat of explosion of the working charge of cc;

Ammonite explosion heat.

Claims (1)

The formula of the invention is the mass; heat of explosion of the explosive charge \ heat of explosion of ammonite, the drawing shows a longitudinal section of the explosive. cartridge. The body of the explosive cartridge is made of two parts of equal mass 1A and 1B. A working charge 2 in the form of a cylinder, for example, from ammonite in 6ZHV, is placed inside the housing. The mass of the charge m And the body of the cartridges is determined from the condition ’1 ,. To initiate the working charge 2, a detonating cord 3 is used, one end of which is installed in contact with the explosive charge in its central part. The sleeve 4 is made integral with part 1A and prevents premature detonation of the detonation by the lateral surface. An explosive cartridge containing a detachable body inside which an explosive charge is placed, and children. niruyushdy cord, one end of which * · * is installed in contact with the explosive charge, characterized in that, in order to expand the scope, the detonating cord end contact with the explosive charge is made in the Central part of the latter, and the mass of the cartridge case is determined from the condition M> 10 -3 --- PE, 9 And where M is the mass of the cartridge body; m - mass of explosive charge? heat of explosion of a working dawn ⁰ yes cc; Q | - heat of explosion of ammonite.