Cars, trains, and aircraft refueling, injecting acetylene gas and liquefied gas into cans, operation of paper machine and printing and dyeing machine, etc., all of these have to face a displacement compensation issues that require a flexible pipe to resolve. According to the old design, these mostly use copper serpentine tube or rubber hose. Because of some problems in different extent, these pipes often bring some difficulties for industrial production or maintenance.
Metal hoses’ good overall performance is fully reflected in this aspect. In general industry, in addition to pressure and temperature, there are still some other harsh conditions, such as fatigue, corrosion, vibration, pressure, shock, etc. Under such circumstances, it is the most appropriate to use metal hoses to compensate for the locomotion of the pipeline.
Due to the need for loading and unloading the mold, the movable cylinder of vulcanizing machine will make movement up and down. See Figure 1-4.
After the copper serpentine pipe reciprocation 3000-5000 times, fatigue fracture occurs. It can continue to use after the repair, but it will cause loss of time to stop to repair. Rubber pipes, while having good flexibility characteristics and strong fatigue resistance, still have weaknesses in pressure bearing, temperature resistance, anti-aging and other aspects. Usually, it cannot continue to use after 3 to 5 months. There is one factory who uses metal hoses instead of copper serpentine pipes and rubber hoses as steam pipes on rubber vulcanizing machine, and it is very effective. The result is pressure of 0.6MPa, temperature of 170 ℃, and the movable end displacement of 200mm. In addition, under the condition of nearly 100 cycles per day, it has no visible leaks or other anomalies after the use of one year and four months.