There are many high-pressure hose manufacturing equipment, many types of raw materials, and complex production processes. However, in recent years, the production process of high-pressure hoses with plastics or thermoplastic elastomers as the main raw materials can be appropriately simplified, but the price of raw materials is relatively high, and rubber raw materials are still the main raw materials. What are the main production processes of high-pressure hoses?

High pressure hose production process:

1. Use a mixer to mix the inner layer glue, middle layer glue and outer layer glue according to the high pressure hose. The inner tubing is extruded with an extruder and covered on a soft or hard core coated with depilatory

2. The high-pressure hose uses a rolling mill to thinly press the adhesive in the middle layer, add a release agent to collect the reel, and cut it to the specified width according to the process requirements.

3. When winding or weaving copper-coated steel wire or copper-coated steel wire on the winding machine or knitting machine, simultaneously winding the middle layer adhesive sheet between every two layers of copper-coated steel wire or copper-coated steel wire on the winding machine or knitting machine . Start and end point of winding wire

4. Re-cover external adhesive on extruder, wrap lead or cloth vulcanized protective layer. high-pressure hose

5. Vulcanization by vulcanization pain or salt bath.

Common problems of high pressure hose

1. External adhesive layer failure:

(1) There is a crack on the outer table of the hose

The main reason for cracks on the outer table of the hose is that the hose bends in a cold environment.

(2) A bubble ring appears on the outer surface of the hose

The cause of the bulge on the outer surface of the hose is the poor quality of the hose produced or the improper use of the work.

(3) The high pressure hose is not broken, but the oil penetrates a lot

The hose seeped a lot of oil, but no cracks were found. The reason is that when the high-pressure oil flows through the hose, the inner bridge is eroded, scratched, and penetrated into the wire layer in a large area.

(4) The outer rubber layer of the hose is seriously deteriorated, and micro-cracks appear on the surface, which is the manifestation of natural aging of the hose. Due to aging and deterioration, the outer layer is constantly oxidized, the surface is covered with an ozone layer, which thickens over time, and the hose is slightly bent in use, and small cracks may appear. When this happens, the hose needs to be replaced.

2. Failure of the inner rubber layer of the high-pressure hose:

(1) The rubber layer in the hose is hard and has cracks. The main reason is that plasticizers are added to rubber products to make the hose flexible and malleable. However, if the hose is overheated, the plasticizer may escape.

(2) The rubber layer in the hose is seriously deteriorated and expands significantly. The rubber layer in the hose is seriously deteriorated. The reason for the obvious expansion is that the rubber material in the hose is not compatible with the hydraulic system oil, and the hose is deteriorated by chemical action. 3. Indicates the failure of the reinforcement layer.

(1) The hose is broken, and iron wire is braided near the broken part, the rusted hose is broken, and the outer rubber layer is peeled off for inspection, and as a result, the iron wire is braided near the broken part, and rust occurs. This is mainly because the strength of the hose is weakened by the action of moisture or corrosive substances, and it ruptures under high pressure.

(2) The reinforcement layer of the hose is not rusted, but the reinforcement layer has irregular silk damage.

The hose was broken, peeling off the external adhesive, the reinforcement layer was not rusted, but broke irregularly along the length of the reinforcement layer, mainly because the hose was subjected to high frequency shock.

4. Failure of high pressure hose rupture outlet:

(1) One or more hoses are broken, the cracks are neat, and other parts are in good condition.

This phenomenon is mainly because the system pressure is too high, exceeding the pressure capacity of the hose.

(2) Twist when the hose is ruptured

This phenomenon occurs when the hose is excessively twisted during installation or use.

5. In summary, through the above analysis, the following matters should be paid attention to when using high-pressure hoses in the future:

(1) The hose arrangement should avoid heat sources as much as possible and keep away from the engine exhaust pipe. If necessary, equipment such as sleeves or protective screens can be used to prevent the hose from deteriorating to heat.

(2) When the hose needs to cross or work, apply protective devices such as hose clamps or springs where friction on the mechanical surface may occur to prevent damage to the outside of the hose.

(3) When the high-pressure hose needs to be bent, the bending radius cannot be too small, and must be more than 9 times the outer diameter. There must be a straight segment 2 times larger than the outside diameter of the pipe where the hose and fitting are connected.

(4) When installing the high-pressure hose, do not tighten it. Even if there is no relative movement at both ends of the hose, keep the hose loose. A tensioned hose expands under pressure and loses strength.

(5) Do not twist the hose during installation. A little twist on the hose will reduce the strength and the fitting will loosen, assemble with the hose tightened to the hose rather than the fitting.

(6) If the hose is composed of main parts, it is recommended to check or replace it regularly.