RU2549385C1 - Method of fittings of flexible high-pressure hoses attachment - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: deformation of materials of a bead-forming zone is controlled in a radial direction between a conical plug and a metal insert prior to vulcanisation of the bead-forming zone of a flexible high-pressure hose and additionally after vulcanisation is finished; with that, a deformation value of materials of the bead-forming zone prior to vulcanisation is 8-20% of the material thickness above a bead ring in a turn-up zone, and an additional deformation value of materials of the bead-forming zone after vulcanisation is 2-10% of the material thickness above the bead-forming zone.

EFFECT: improving reliable attachment of fittings of flexible hoses and improving the tightness of the flexible high-pressure hoses.

4 cl, 6 dwg

Description

The invention relates to a method for manufacturing rubber-cord products and can be used in the manufacture of flexible high-pressure hoses for pumping liquid and viscous media, as well as gaseous substances.

A known method of fastening the fittings of flexible high-pressure hoses (patent 2162982 RU, IPC F16L 33/32, publ. 02.20.2001), which consists in the fact that first a conical cup is put on the flexible sleeve, and then they are laid on the annular conical protrusion of the flange and the annular recess a sealing layer of rubber, layers of reinforcing cord and the bead ring is installed in the annular recess. The sealing rubber layer and the reinforcing cord layers are wrapped around the bead ring, and a coating rubber layer is laid on top. The assembled preform is vulcanized, while uniformly alternating protrusions and depressions are pressed onto the rubber coating layer. The cone of the conical glass is rolled with a protrusion at the end of the flange.

The disadvantage of this method is the insufficient sealing of the side zone of the flexible sleeve in the flange connection due to the fact that in the process of crimping the layers of the reinforcing cord and rubber by compressing the conical cup to the end of the flange, they shift in the axial direction.

A known method of fastening the fittings of flexible high-pressure hoses (patent 2262031 RU, IPC F16L 33/32, publ. 10.10.2005), which consists in the fact that, first, a rubber sealing layer, paired layers of reinforcing cord are laid on a stepped conical protrusion of the flange and annular recesses set the side rings in the annular recesses. The paired layers of the reinforcing cord are wrapped around the bead rings, wrapped with polymer threads or metal wire in the area of the conical protrusion, and a rubber coating layer is laid on top. When using a split conical cup during assembly, both halves of the conical cup are applied to the rubber cover layer, pulled together at the ends with clamps, then polymer threads or metal wire are wound and the clamps removed.

The disadvantage of this method is the low reliability of fastening the fittings of flexible high-pressure hoses.

A common disadvantage of the known methods of fastening reinforcement is the low reliability and tightness of the fastening of the reinforcement of flexible hoses, uncontrolled compression of materials in the bead area during vulcanization and operation, due to which the sealing and coating layers of rubber in the fastening area of the reinforcement relax, which leads to depressurization of the side zone flexible sleeves.

The technical result of the proposed method of fastening reinforcement is to increase the reliability of fastening of reinforcement of flexible hoses and, as a result, increase the reliability and tightness of flexible hoses of high pressure.

The technical result is achieved by regulating the deformation (compression) of the materials of the airborne zone in the radial direction between the conical sleeve and the metal insert before vulcanization of the airborne zone of the flexible high pressure hose and additional regulation after vulcanization, and the amount of deformation (compression) of the materials of the airborne zone before vulcanization is 8- 20% of the material thickness above the bead ring in the inversion zone, and the amount of additional deformation (compression) of the bead zone materials after vulcanization and 2-10% of the thickness of the material above the bead wire in turn-up zone.

The invention is illustrated by drawings:

figure 1 is a fragment of the mounting of reinforcement during installation;

figure 2 is a section aa;

figure 3 is a fragment of the reinforcement during the vulcanization process;

4 is a section bB;

figure 5 is a fragment of the reinforcement during operation;

6 is a section bb.

The method of mounting the fittings of flexible high-pressure hoses is as follows.

Assemble the side zone of the flexible hose of high pressure 1 to the connecting flange 2 according to known technology. Slid completely into the end flange 2 cone sleeve 3 with a through longitudinal groove 4 into which is inserted a metal insert 5 is fixed a fixing flange 6 and is fixed by bolts 7 between the metal insert 5 and the conical wall 8 of the sleeve 3 a gap a (1 , Fig.2).

Using bolted joints 7, the mounting flange 6 is pushed onto the conical sleeve 3 until its wall 8 is locked with the wall of the metal insert 5. An initial adjustable deformation of the materials 9 of the side zone occurs in the radial direction between the conical sleeve 3 and the side ring 10 in the inversion zone within 8- 20% of the thickness of the materials 9. The deformation of the materials 9 of the airborne zone in the radial direction is ensured by the choice of the gap a between the conical sleeve 3 and the metal insert 5 (FIG. 2, FIG. 3, FIG. 4). Next, vulcanization of the flexible hose of high pressure 1. At the end of the vulcanization process, dismantle the bolts 7, shift the mounting flange 6, remove the metal insert 5 and thereby increase the width of the gap, which allows for additional controlled deformation (compression) of the materials of the side zone of the flexible sleeve. Next, a mounting flange 6 is mounted on the conical sleeve 3, for which, by means of bolted connections 7, the mounting flange 6 is pushed onto the conical sleeve 3 until the walls 8 are closed. Thus, after curing, an additional controlled deformation of the side zone materials 9 in the radial direction between the conical sleeve 3 and a bead ring 10 in the inversion zone, which is 2-10% of the thickness of the materials 9 (Fig. 5, Fig. 6).

The size of the gaps determines the optimal deformation of materials in the side zone of flexible high-pressure hoses by reducing or increasing the width of the groove of the conical sleeve 3 or by reducing or increasing the width of the metal insert 5, while the magnitude of the deformation, in turn, depends on the material of the cord frame and the rigidity of the rubber .

Thus, the claimed technical solution provides reliable fastening of the fittings and tightness of the side zone of flexible high-pressure hoses.

Claims (4)

1. The method of fastening the reinforcement of flexible hoses of high pressure, which consists in the fact that the side zone of the flexible sleeve is crimped between conical metal parts, characterized in that before vulcanization of the side zone of the flexible sleeve, an adjustable deformation of the side zone materials in the radial direction between the conical sleeve and the metal insert is carried out and after vulcanization, an additional controlled deformation of the airborne materials in the radial direction is additionally carried out. 2. The method of fastening the reinforcement of flexible high-pressure hoses according to claim 1, characterized in that the deformation value of the side zone materials before vulcanization is 8-20% of the material thickness above the side ring in the inversion zone. 3. The method of fastening the reinforcement of flexible high-pressure hoses according to claim 1, characterized in that the amount of deformation of the materials on the side zone after vulcanization is 2-10% of the thickness of the material above the side ring in the inversion zone. 4. The method of fastening the reinforcement of flexible high-pressure hoses according to claim 1, characterized in that by reducing or increasing the width of the through longitudinal groove of the conical sleeve or by reducing or increasing the width of the metal insert, the gaps are changed to ensure optimal control of the deformation of the materials on the side zone of the flexible pipes high pressure.

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