In recent years, with the continuous development of automobile, petroleum, coal mining, chemical industry, machinery, national defense aerospace and other industries,High pressure steel wire braided hoseThe application of is becoming more and more extensive. Due to the increasingly harsh use conditions of rubber hoses and the continuous improvement of technical requirements, there will always be some quality problems. Here is a detailed introduction from jiayuxing!

1. Pitted surface

(1) Quality problem: there are many fine particles on the surface of the rubber hose.

(2) Cause analysis:

① The rubber contains rubber particles, which are evenly dispersed into the rubber after being crushed;

② For sulfur free rubber, it is mainly caused by too long internal mixing time, too high temperature and too much carbon black gel formation;

③ Sulfur added rubber is mainly caused by scorching when the temperature is high for a long time;

④ Or the burnt rubber is mixed into the rubber.

(3) Solutions:

① Strictly control the internal mixing time and temperature;

② Strictly control the roller temperature and sulfur adding method in the sulfur adding process:

③ Before hot refining and extrusion, the rubber mixer and extruder must be strictly checked for residual rubber; ④ The material name, time and weight of each batch of rubber return must be strictly identified and cleaned.

2. Loose mouth

(1) Quality problem: the steel wire head is scattered after cutting.

(2) Cause analysis:

① The steel wire is too rigid:

② Insufficient spindle tension;

③ Poor medium glue adhesion or insufficient fixed elongation;

④ Separation of the internal rubber and steel wire layer;

⑤ The thickness of the outer glue is thin and the constant elongation stress is too low.

(3) Solutions:

① Replace with thinner steel wire;

② Increase spindle tension;

③ Improve the viscosity and calmness of medium glue;

④ Control vulcanization time;

⑤ Increase the tensile stress of the outer glue.

3. Uneven outer diameter

(1) Quality problems:

① The steel wire layer is uniform, and the outer diameter of the rubber hose is uneven;

② The steel wire layer is uneven, and the outer diameter is uneven.

(2) Cause analysis:

① Uneven outer diameter of cladding surface and uneven dispersion of rubber lead to uneven expansion and uneven tension of water cloth;

② Uneven bottoming, degumming of braiding, too dense braiding of one layer of two layers of pipes.

(3) Solutions:

① Improve the coating process, improve the dispersion of rubber, and adjust the tension of water cloth;

② Improve the bottoming process and improve the inner rubber tappet Sexual or frozen inner glue, braid density should be reasonable.

As the equipment, process and personnel level of each rubber hose enterprise are different, the problems and solutions are not exactly the same, and specific problems need to be analyzed. Production enterprises should strictly implement the process procedures to avoid quality defects due to human factors, otherwise irreparable economic losses and even accidents will be caused, so we should attach great importance to the uniformity of quality.