Consolidations rubber on hydraulic cylinders, cuffs, consolidations of the directing rod and the piston
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The available literature, reference books on consolidations and catalogs of producers do not contain justifications of an optimality of the offered designs neither from a technical aspect, nor from economic. On working surfaces of rods and sleeves of a hydraulic cylinder it is difficult to provide and support the high frequency and lack of microdefects in the form of a time, sinks, risok, zaboin, traces of corrosion and demolitions of a chromic covering. The frictional stream of the molecules of working liquid which stuck to a rod of a hydraulic cylinder demands installation before consolidation of antisplash elements, the slowing-down wear of consolidations and hit of dirt in the working planes of a hydraulic cylinder.
The factors influencing the choice of type and the sizes of section of consolidations:
- Admissible side plays in support of a rod and the piston
- Limitation of locations of consolidation with a small difference in the diameters of the piston and a rod.
- Degree of impurity and type of working liquid
- Temperature range of operability of hydraulic cylinders
- Working and maximum speeds of a rod
- Hydraulic cylinder operating modes on the frequency of frequency of the courses.
It is more difficult to exclude hydrodynamic leaks in the form of drops from a fast-moving rod. For excavators peretechka on consolidation of the piston in volume to several cm ³ / mines are usually allowed that allows to use the most wearproof firm cutting consolidations like piston rings.
Characteristics of mobile consolidations of a hydraulic cylinder are defined by the materials applied in them. Traditionally — rubber which belongs to cheap and technological materials. If pressure more than 10 MPas rubber consolidations demand anti-extrusive protection by means of protective rings from more rigid materials that complicates and raises the price of a design. Polyurethane consolidations possess bigger wear resistance and anti-extrusive firmness, the lowered friction coefficient. The working resource of polyurethane consolidations is 3-4 times higher than rubber.
A number of semifixed plastic in comparison with the previous materials have the high module of elasticity, they are efficient with a pressure up to 40 MPas without additional protection. Working edges Haytrel allow to reach the highest tightness, however they are sensitive to microdefects of a surface of a rod, as a rule, they are supplied with podzhimny rings from rubber or steel.
Consolidations rubber on hydraulic cylinders, cuffs, consolidations of the directing rod and the piston