FESTO cylinder load increase and decrease too fast, especially rapid start, stop and change in operating conditions when the temperature changes, the warm cylinder is not the correct way, open the insulation layer too early shutdown, etc., in the cylinder (cylinder) and law Blue produces great thermal stress and thermal distortion.
1.Festo FESTO cylinders are cast and cylinders are subjected to aging treatment after leaving the factory, so that the internal stress generated by the cylinder during the casting process is completely eliminated. If the aging time is short, then the processed cylinder will be deformed in the subsequent operation.
2. The force of the Festo FESTO cylinder during operation is very complicated. In addition to the pressure difference between the gas inside and outside the cylinder and the isostatic load of the various components contained therein, it is also necessary to withstand the static part when the steam flows out of the stator vane. The reaction force, as well as the force applied to the cylinder in the cold and hot state of various connecting pipes, under the interaction of these forces, the cylinder is prone to plastic deformation and causes leakage.
3. Festo FESTO cylinder load increase and decrease too fast, especially rapid start, stop and change in operating conditions when the temperature is large, the warm cylinder is not the correct way, open the insulation layer when shutdown and maintenance is too early, in the cylinder And on the flange there is a lot of thermal stress and thermal deformation.
4. Festo FESTO cylinders produced stress during machining or after welding, but they were not eliminated by tempering the cylinders, resulting in large residual stresses in the cylinders and permanent deformation during operation.
5. During the installation or overhaul process, due to the overhaul and overhaul techniques, the expansion gaps of the inner cylinder, cylinder spacers, spacers and steam jackets are not suitable, or the expansion gaps of the mounting lugs are not suitable. After operation, a huge expansion force is generated to deform the cylinder.
6. The cylinder sealant used is of poor quality, excessive impurities or the wrong type; if there are hard particles in the sealant of the cylinder, the sealing surface will be difficult to be tightly combined.
solution:
1.Festo Festo cylinder deformation or leakage of the serious combination of the surface, using the method of scraping the joint surface
If the upper cylinder surface is deformed in the range of 0.05mm, the upper cylinder joint surface is used as the reference surface, and reddened or embossed blue paper is coated on the lower cylinder joint surface, and the lower cylinder is scratched according to the trace. If the deformation of the upper face of the cylinder is large, apply red dan on the upper cylinder, and use a large flat rule to remove the marks and flatten the upper cylinder. Or take the mechanical processing method to level the upper cylinder joint surface, and then use the upper cylinder as a reference to scrape the lower cylinder joint surface. There are two general methods for scraping the cylinder joint surface:
(1) Bolts that are not tightly coupled to the surface are used to push the upper cylinder back and forth slightly with the jack, and the scraping is performed according to the situation of the red cylinder of the lower cylinder joint surface. This method is suitable for high-rigidity high-pressure cylinders.
(2) It is a bolt with a tight joint surface. According to the tightness of the inspection joint surface of the feeler gauge, the value and the pressed-out trace are measured and the joint surface is repaired. This method can eliminate the influence of the cylinder arc on the clearance.
2. Use proper cylinder seal material
Because there are no unified national standards and industry standards for turbine sealants for turbines, the production materials and formulations are also different, and the quality of products is uneven. When selecting a turbine sealant for cylinders, it is necessary to choose a reputation in the industry and product quality. A guaranteed regular manufacturer to ensure the tightness of the cylinder after overhaul.
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