1. The reinforcing layer of the hose is not rusted, but there is irregular wire breakage.
If the hose is broken, peel off the outer rubber layer and check that the reinforcement layer is not rusted, but there are irregular broken wires in the length direction of the reinforcement layer. The main reason is that the hose is subjected to high-frequency impact force.
2. When the rupture part of the high pressure rubber tubing is large or about to be broken due to the action of external force (shrapnel breakdown, extrusion rupture) or system overload, the bone setting method can be used.
Wipe the rupture of the hose and cut off the rupture. Insert the self-made steel "bones" into the cut hose (In special emergency, a steel pipe with the same outer diameter as the hose's bone diameter can also be used as "bones").
Use a self-made steel plate clamp to clamp the high pressure rubber tubing and the "bones" (In a special emergency, 8-gauge iron wire can be used instead of the self-made steel plate clamp). The connected hose can be used after cleaning.
3. The hose is broken, and the braided wire near the break is rusted.
If the high-pressure oil pipe is broken, peel off the outer rubber layer and check to find that the braided and wound steel wire near the rupture is rusted. This is mainly due to the effect of moisture or corrosive substances in the outer rubber layer, which weakens the strength of the rubber hose, resulting in rupture under high pressure.
When this happens, the outer layer is generally fractured, scratched or seriously deteriorated, so that the outer layer loses its protective effect on strengthening the base layer.
At this time, unfavorable factors such as mechanical damage, chemical corrosion and high temperature baking of the outer rubber layer must be checked and eliminated first, and then the rubber tube must be replaced.
However, there are also cases where the outer rubber layer is kept well but the reinforcement layer is rusted and ruptured, and the rupture opening is usually within 200 mm from the high pressure rubber tubing joint.
Most of the reasons are that the hydraulic joints are unqualified. Since the moisture enters the inner edge of the jacket, the reinforcement layer absorbs the moisture, resulting in rust, which causes the compressive strength of the hose to decrease and rupture.
Note: The arrangement of high pressure rubber tubing should try to prevent heat source, away from the embodiment of the engine exhaust pipe. If it is necessary, cannula or maintenance screen can be used to prevent the hose from being damaged by heat.
When the hose is installed, it should be prevented from being under tension. Even if there is no relative movement between the two ends of the hose, the hose should be kept loose. The clamped hose will expand under the effect of pressure and the strength will decrease.
Do not misunderstand the hose during installation. Slight modification of the hose can reduce its strength and loosen the joint. When oil drills high pressure rubber tubing equipment, the joint should be tightened on the hose, not the hose tightened on the joint.
If the hose is installed on the key part, it is recommended to check or replace it regularly. Where the hose must be inserted or may conflict with the mechanical surface during operation, use protective equipment such as hose clamps or springs to prevent damage to the outer layer of the high pressure rubber tubing.
When it is necessary to bend the hose, the bending radius should not be too small, and should be greater than 9 times the outer diameter. There should be a straight line section greater than 2 times the outer diameter of the tube at the connection between the hose and the joint.
