Solutions to the serious distortion and deformation of cloth-covered hoses under pressure

阅读更多

How to solve the serious distortion and deformation of cloth-covered hose under pressure

The main reasons for the severe distortion and deformation of cloth-covered hoses under pressure are as follows:

1. Due to the structure of the fabric itself, the 45-degree cutting angle causes inconsistent stress and elongation of the warp and latitude lines when under pressure.
2. The cutting angle error is large, and the overlapped tape after cutting is not parallel.
3. The inner diameter of the tube blank is too large, and the rods are not tightly attached to each other after being set. The external pressure exerted by the water cloth wrapped around the cloth causes the hose body to twist.
4. If the amount of release agent is too much, the tube blank will slip and twist with the mandrel when it is stressed.

So how to solve the above problems?

1. Strictly control the cutting angle and overlapping process.
2. Make sure that the inner diameter of the inner layer of glue extruded is basically the same as the outer diameter of the mandrel, and adjust the air blast volume of the mandrel so that the inner wall of the tube blank is tightly wrapped on the mandrel.
3. Master the concentration and dosage of the isolating agent.
4. It is not advisable to wrap the water cloth from one end to the other end, but from the middle of the hose to both ends.
5. Factories with conditions can use rotary water-wrapping machines, but attention should be paid to promptly adjusting the winding force exerted by the water cloth on the cloth-clamping hoses for hoses with different outer diameters.

Precautions for clamping cloth hose

1. The cloth-clamped hose can only be used to transport the designed materials, otherwise the service life will be reduced or it will fail. For example, if the hose is used to transport a highly corrosive medium, the material of the hose needs to be selected with good corrosion resistance.
2. Use the correct length of cloth clamping hose. Under high pressure, the length of the hose will change, and mechanical movement will also cause length changes. Therefore, you need to pay attention to adjusting the length of the hose during use to ensure its correct connection with equipment, pipes, etc.
3. The cloth-clamped hose should not be used under pressure exceeding the design working pressure. If the actual working pressure exceeds the designed working pressure, the hose may rupture or deform, causing media leakage and other accidents.
4. Under normal circumstances, the temperature of the medium transported by the cloth-covered hose should not exceed 40℃-+120*C, otherwise the service life will be reduced. For example, if you are transporting high-temperature media, you need to choose a hose material and structure with good high-temperature resistance.
5. The cloth-clamped hose should not be used below the minimum bending radius of the hose to avoid bending or bending near the pipe joint, which will hinder hydraulic transmission and material transportation or damage the hose assembly. During installation and transportation, care must be taken to avoid damage to the hose. In short, as a common conveying pipeline equipment, cloth-covered hose needs to pay attention to the above aspects during use to ensure its normal operation and extend its service life.