Industrial hose, rubber hose how to identify good and bad?

Rubber hose is divided into two kinds of high-pressure hose and low-pressure hose, high-pressure hose is generally composed of four parts: outer rubber layer, steel wire reinforcement layer, middle rubber layer and inner rubber layer. The inner rubber layer of the hose is in direct contact with the hydraulic oil, generally made of synthetic rubber. The bearing capacity of the hose depends on the strengthening layer, the layer is the skeleton of the hose, usually made of steel wire braid or winding. Most of the high-pressure steel wire braid for the skeleton, high-pressure, high-pressure steel wire winding skeleton. The outer rubber layer of the hose is generally made of wear-resistant, corrosion-resistant rubber to ensure that the reinforcing layer is not subject to mechanical damage, chemical corrosion, moisture rust, low-pressure hose to braided cotton, hemp wire instead of braided steel wire, generally used for low-pressure oil return pipeline.
 Rubber hose production with the mixer according to the formula mixing out of the inner layer of rubber, rubber and outer layer of rubber; with the extruder to extrude the inner layer of the hose, coated in the release agent coated with a soft core or hard core (liquid nitrogen freezing method can be used without the core); calendering machine pressed into the middle of a thin sheet of rubber, plus the isolation agent rolled up and according to the requirements of the process is cut into the prescribed width; will contain the core of the inner layer of rubber hose in the winding machine or braiding machine on the winding on the copper-coated steel wire or copper-coated steel wire rope, while in the winding machine or braiding machine on the copper-coated steel wire or copper-coated steel wire rope. At the same time in the winding machine or braiding machine will be in the middle layer of rubber sheet synchronous winding in each two layers of copper-plated steel wire or copper-plated steel wire rope between the beginning and end of the winding steel wire tied (some early winding machine need to pre-stress copper-plated steel wire for pre-stressing the shape of the treatment); again in the extruder wrapped on the outer layer of rubber, and then wrapped with lead or cloth vulcanization protective layer; through the vulcanization tank or salt bath vulcanization; remove the protective layer of sulfurized, pull out the tube core, buckled pressure on the Pipe joints, sampling pressure test.
 High-pressure hose wall of the inner and outer layers are oil-resistant rubber, the middle of the (2 to 4 layers) cross-braided steel wire or twisted steel wire. Poor quality of the hose will appear: uneven thickness of the hose wall; steel wire weaving too tight, too loose or too few layers of steel wire; hose deformation (elongation, shortening or bending of the deformation) is larger; the outer layer of rubber airtightness leads to steel wire corrosion; the inner layer of rubber sealing is poor so that high-pressure oil can easily enter the steel wire layer; the rubber layer and the steel wire layer of adhesion is insufficient. All of the above will make the hose to reduce the bearing capacity, in the weak point of the pipe wall burst. Assembly, if the amount of buckling is too small, that is, the joints and hoses between the pressure is too loose, under the action of oil pressure hose in the early use of the joints may come out of the joints; if the amount of buckling is too large, then the joints and hoses pressed too tightly, easy to lead to the inner layer of the hose by the local damage, resulting in cracks, high-pressure oil from the rupture directly into the steel wire layer, and then along the steel wire between the gaps fled to the end of the jacket spray, or has been fled along the steel wire layer to a certain place Accumulation, so that the outer layer of rubber bulging or even rupture. Hose and fittings in the assembly, if the buckling speed is too fast, it is easy to cause damage to the inner rubber and steel wire layer fracture, so that the hose is prematurely damaged in use.