The purpose of launching caisson is to transfer the caisson to a specific part of the water, and the launching caisson operation according to the Marine air bag can greatly save the cost. The key to the Marine air bag launching caisson is divided into the following four steps:

1. A tumbling air bag is placed under the caisson;

2, in the front end of the caisson to develop fixed fixed steel cable, steel cable fixed on the crane, start the crane to move the caisson;

3, move the air bag to the front end of the caisson development, often roll the caisson into the water;

4. In the water, the tumbling air bag is fixed under the water through the fast connecting head. When the caisson is rolling, the fast connecting head is loosened and the caisson is transported.

Importance of vulcanization pressure of rubber Marine fender

Vulcanization pressure refers to the size of the pressure on the unit area of the rubber product during the vulcanization process. In addition to thin wall products such as tape, other rubber products need to test drive a certain pressure during vulcanization. The pressure effect of vulcanization mainly has the following points:

1. Avoid bubbles occurring in the vulcanization process of rubber Marine fender and improve the fineness of rubber material.

During vulcanization, the glue contains water and other easily evaporable substances, as well as hydrogen sulfide gas that may be formed in the vulcanization reaction, which evaporates and escapes at high temperatures and causes bubbles to occur in the glue. If the vulcanization pressure is greater than the rubber may escape the internal pressure, the occurrence of bubbles can be avoided, and the fineness of the rubber can be improved.

2, make the rubber Marine fender rubber material easy to flow and fill the mold cavity

In order to produce clear markings, full rubber products, the rubber material must be able to flow and fill the mold cavity. In particular, the effect of vulcanization pressure is more significant during the vulcanization induction period when the rubber is in the uncrosslinked state. The experiment shows that if the vulcanization temperature of molded rubber products is 100-140℃, the vulcanization pressure should be in the range of 2-4.9MPA.

3, improve the rubber Marine fender rubber material and the density of the cloth layer

During vulcanization, with the increase of vulcanization pressure, the depth of rubber penetration into the cloth layer increases, and then the adhesion of rubber and the cloth layer can be improved as well as the flexure resistance of rubber Marine fender.

4, contribute to the progress of physical and mechanical function of vulcanized rubber

Experiments show that with 5MPA pressure vulcanization, its wear resistance is 10%-20% higher than the general rubber Marine fender vulcanized under 2MPA. This is due to the effect that the progressive vulcanization pressure can increase the fineness of the vulcanized rubber. However, too high vulcanization pressure will also be bad for the function of rubber, because high pressure, like high temperature, will accelerate the pyrolysis of rubber molecules. In addition, the structure of the textile material will also be damaged under high pressure, resulting in decreased flexural resistance.