RU2262031C1 - Device for attachment of fittings of high-pressure flexible hoses - Google Patents

Abstract

FIELD: mechanical rubber goods; manufacture of flexible high-pressure hoses for handling liquid, viscous and gaseous media.

SUBSTANCE: proposed attachment device has stepped taper projection of flange with circular recesses for receiving 2-16 rings. Twin reinforcing layers of cord are wound with polymer threads or metal wire in zone of taper projection and covering layer of rubber is laid over them. Taper sleeve is split and its both halves are mounted on covering rubber layer and are wrapped with polymer threads of metal wire.

EFFECT: enhanced strength of attachment of flexible hose fittings; improved quality of assembly.

2 cl, 4 dwg

Description

The invention relates to the construction of rubber products, in particular flexible high-pressure hoses, and can be used in the manufacture and operation of flexible hoses in all industries for pumping liquid, viscous substances and gases.

A device for fastening reinforcement of flexible high-pressure hoses (see Lepetov et al. "Calculations and design of rubber products", "Chemistry", 1977, pp. 189-191) by using elements of the power frame of the sleeve for fastening the reinforcement, for example, in the form of tips.

A disadvantage of the known device is the unreliability of the fastening, since during prolonged use and elevated temperature, relaxation processes that occur over time in the rubber lead to a decrease in the friction force, depressurization and breakdown of the tip.

It is also known a device for fastening reinforcement of flexible sleeves (see AS No. 1372127, MKI ⁴ - F 16 F 9/04 "Rubber cord element"), containing side rings made with annular protrusions having rows arranged in rows corresponding to the number of layers of cord threads , holes in which the ends of the threads are placed.

A disadvantage of the known device is that during prolonged operation at high pressures and temperatures, tightness is not ensured, in addition, the design of the device is complicated and time-consuming to repair it.

The closest in the set of essential features and the technical result achieved - the prototype, is a device for fastening the fittings of flexible high-pressure hoses (see RU No. 2162982, class 7 F 16 L 33/32, publ. Bull. No. 4 from 02/10/2011 ) containing a coating and sealing rubber layers, reinforcing cord layers, a bead ring, a flange with a conical protrusion to be attached, and a conical cup located at the end of the flange rolled with its shoulder at the rubber cover layer.

A disadvantage of the known prototype is that at pressures of more than 5 MPa to ensure sleeve strength, the number of layers of the reinforcing cord (metal cord) must be more than 4 (from 4-12), while fixing such a number of layers on one side ring is technologically difficult due to the fact that it is necessary to wrap all layers with high rigidity around one side ring.

In addition, with a large number of layers, there is a significant unevenness in the tension of the cord threads in the area of the bead ring, which leads to a decrease in the strength of the product and the reliability of the fastening of the sleeve.

Reinforcement assembly is difficult due to the need to pre-dress the conical beaker on a flexible sleeve, which reduces both labor productivity and the quality of the assembled reinforcement fastening device.

The technical result of the claimed invention is to eliminate these drawbacks, providing fastening on the side rings of the reinforcing layers of the cord more than 4, uniform distribution of the load over the entire contact area of the conical protrusion with the reinforcing layers of the cord, thereby ensuring sleeve strength, build quality.

To achieve this technical result, the device for fastening the reinforcement of flexible high-pressure hoses, comprising a cover and sealing rubber layers, reinforcing cord layers, a bead ring, a flange with a conical protrusion and a conical cup, is characterized in that the conical protrusion of the flange is made stepwise with annular recesses for installing on-board rings in an amount of 2-16, while the reinforcing layers of the cord are wrapped with polymer threads or metal wire in the area of the conical protrusion, and the conical cup is made once eznym, the two halves of which are mounted on the rubber coating layer and are wound polymeric yarns or metal wire on the circumference of the conical nozzle.

The installation of several 2-16 bead rings, wrapped in reinforcing layers of the cord, in the annular recesses of the stepped conical protrusion of the flange allows you to wrap around the bead rings more than 4 reinforcing layers of the cord, to evenly distribute the load over the entire contact area of the conical protrusion with the reinforcing layers of the cord.

Using a split conical cup will increase labor productivity and reduce labor intensity, since there is no need to first put the conical cup on a flexible sleeve, which then interferes with the assembly of the rest of the fittings, and then compress it, which also reduces the manufacturing quality of the device.

The invention is illustrated by drawings:

figure 1 is a sectional view of the attachment device of the reinforcement of the flexible hose of high pressure; figure 2 - place I in figure 1; figure 3 is a section of a device with a split conical glass; figure 4 - section aa in figure 3.

The device for fastening the reinforcement of a flexible high-pressure hose contains a flange 1 (Fig. 1), at the end of which there is a stepped conical protrusion 2 and annular recesses 3, 4, 5, in which side rings 6, 7, 8 are installed with paired reinforcing layers cords 9, 10, 11 (FIG. 2), a sealing layer of rubber 12 and a cover layer of rubber 13, polymer threads or metal wire 14 are wound on the pair of reinforcing layers of the cord 9, 10, 11. In the case of using a flexible high-pressure hose above 10 MPa mounting device contains split conical beaker of two halves 15 and 16 (Figures 3, 4) wound on a conical beaker polymeric threads or metal wire 17 (Figure 3).

In the manufacturing process, the assembly of the device for fastening the reinforcement of the flexible hose of high pressure is as follows.

First, on the stepped conical protrusion 2 of the flange 1 and the annular recesses 3, 4, 5, the sealing layer of rubber 12, the paired layers of the reinforcing cord 9, 10, 11 are laid and the side rings 6, 7, 8 are installed in the annular recesses 3, 4, 5. Paired the layers of the reinforcing cord 9, 10, 11 are wrapped around the side rings 6, 7, 8, wrapped with polymer threads or metal wire 14 in the area of the conical protrusion 2, the coating layer of rubber 13 is laid on top.

When using a split conical cup during assembly, both halves 15 and 16 of the conical cup are superimposed on the cover layer of rubber 13, are pulled together at the ends by clamps, then polymer threads or metal wire 17 are wound and the clamps are removed.

To exclude the displacement of one half 15 relative to the other half 16 of the conical glass, they can be seized by spot welding along the length of the conical glass before winding polymer fibers or metal wire.

Claims (2)

1. The device for fastening the reinforcement of flexible high-pressure hoses, comprising a coating and sealing rubber layers, reinforcing cord layers, an onboard ring, a flange with a conical protrusion, characterized in that the conical protrusion of the flange is made stepwise with annular recesses for installing on-board rings in an amount of 2-16 and the reinforcing layers of the cord are wrapped with polymer threads or metal wire in the area of the conical protrusion. 2. The device according to claim 1, characterized in that it is equipped with a split conical glass, both halves of which are installed on the coating layer of rubber and wrapped with polymer threads or metal wire around the circumference of the conical glass.

Images