What issues should be paid attention to when repairing high-pressure hoses?

The following problems may occur with high-pressure hoses during use, including bulges, punctures, and connectors falling off. However, no matter what the damage is, the damaged area must be cut off during repair, and then repaired by re-crimping the joint. The high-pressure hose joint is composed of a mandrel and a jacket. The following mainly introduces the issues that need to be paid attention to when repairing high-pressure hoses.
, High-pressure hose mandrel
The mandrel generally adopts the form of pulling backwards, and its main purpose is to increase the firmness of the connection between the mandrel and the hose. After the barb processing of the mandrel is completed, the top of the barb must be blunted, otherwise the top of the barb will pierce the lining material of the high-pressure hose during the crimping process. Even if the high-pressure hose joint has been fastened firmly, if the inner If the layer is damaged, high-pressure water will leak from the withholding point.
, High-pressure hose jacket
The jacket generally adopts the form shown in the figure, the wall thickness should be moderate, and the inner rectangular tooth height should not be greater than (), that is, () should not be greater than.
, Selection of high-pressure hose materials
The mandrel and jacket should be made of different materials. Their yield strength and plastic deformation should be different. The strength of the jacket should be smaller than that of the mandrel. The purpose is to make the The outer sleeve is more prone to plastic deformation than the mandrel, which increases the firmness and reliability of the crimping. At the same time, the corrosion resistance requirements of the mandrel should also be considered. For example, if the mandrel is selected from R or R, the outer sleeve should be made from ordinary steel.
, Cutting off high-pressure hoses
First, use thin steel wire to tie the surface near the cutoff point, and then use a grinding wheel cutting machine to cut. The cutting speed should not be too fast. The purpose of cutting is to cool it with water at the same time to prevent The heat destroys the outer protective layer of the hose. The destruction of the protective layer will cause the steel wires of the reinforcing layer to diverge, which will ultimately cause great difficulties in installing the mandrel and jacket.
, Grasp the intensity of suppression.
Before crimping, it is necessary to make an inspection mandrel slightly thinner than the inner hole of the mandrel. When crimping, apply a little lubricating oil on the inspection mandrel and insert it into the inner hole of the mandrel. The strength of the crimping should be enough to pull out the mandrel. In this way, it can not only avoid the phenomenon that the diameter of the inner hole of the mandrel is reduced or even blocked due to excessive buckling force, but also ensure that the joint can be buckled firmly without falling off.
Nowadays, high-pressure hoses have been widely used in all walks of life. Among them, the working conditions of high-pressure hoses are relatively the worst, and they are the most easily overlooked link. Therefore, we must pay attention to multiple aspects of selection, use, maintenance and repair.