Rubber tube high pressure hose and low pressure hose two, high pressure hose generally by the outer layer, steel reinforcement layer, the middle layer and the inner layer of four components. The inner layer is directly in contact with the hydraulic oil and is generally made of synthetic rubber. The carrying capacity of the hose depends on the reinforcement layer, which is the skeleton of the hose, which is usually woven or wound with steel wire. Most of the high-pressure steel wire braid for the skeleton, high pressure, high pressure and more use of wire winding skeleton. The outer layer is usually made of rubber with good wear resistance and good corrosion resistance to ensure that the reinforcement layer is not damaged by mechanical damage, chemical corrosion, damp rust, low pressure hose to weave cotton, twine instead of braided steel wire, pipeline.
High-pressure hose wall are inside and outside the oil-resistant rubber, the middle (2 to 4 layers) cross braided steel wire or wound wire. Poor quality of the hose will appear: hose wall thickness uneven; wire weaving too tight, too loose or wire layer is too small; hose deformation after deformation (elongation, shortening or bending deformation) larger; Poor air tightness lead to corrosion of the steel wire; the inner seal is poor and the high pressure oil easily enters the wire layer; the adhesion between the adhesive layer and the wire layer is insufficient. The above situation will make the hose to bear the force to reduce the final weakness in the wall appears burst. Assembly, if the buckle pressure is too small, that is, between the joints and hose pressure too loose, the role of oil in the early use of the hose may be out from the joint; if the amount of pressure is too large, the connector and hose pressure Too tight, easy to lead to local damage to the inner layer of the hose, resulting in cracks, high pressure oil from the rupture directly into the wire layer, and then along the gap between the wire sprang to the tail of the jacket, or has been along the wire layer to a place to accumulate , So that the outer glue to produce drums or even rupture. Hose and fittings in the assembly, if the buckle speed too fast, likely to cause damage to the inner rubber and wire layer fracture, so that the hose in the use of premature damage.
High-pressure hose When replacing the high-pressure hose, the length of the selected hose, the number of wire layers, the shape and size of the joint should be reasonable, and should minimize the degree of hose bending; tighten the joint nut, do not make the hose twisted, Bending and twisting will greatly reduce the service life of the hose; for some parts prone to friction should take protective measures to prevent the hose burst due to wear and tear.