Expansible chamber devices – Liquid pool sealing relatively movable chamber walls
Patent
1985-12-19
1989-08-15
Garrett, Robert E.
Expansible chamber devices
Liquid pool sealing relatively movable chamber walls
92137, 92153, 57 7, 57217, 57221, 118405, 4274347, 184 151, D07B 712, F15B 1514, F16J 1548, F16J 1556
Patent
active
048564141
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to mechanical engineering and, more particularly, it relates to a method of packing long-sized porous bodies such as locked-coil steel ropes or stacked bands used as traction members, for example, in hydraulic cylinders with a flexible piston rod.
This invention can be used most advantageously for packing long-sized porous bodies operating in a fluid medium between zones of different pressure, for example, in hydropneumatic cylinders with rods in the form of long-sized porous bodies such as ropes which may be employed in hoisting devices, in feed systems of mining machines, in various cranes, in feed means of drilling tools, in power rigging for moving mine headframes and other buildings and structures.
The present invention can also be used for the sealing and protection of long-sized porous bodies subjected to the effect of seawater, mine water and atmosphere and to other corrosion effects.
A problem exists in the tightness of seal and corrosion resistance of long-sized porous bodies operating in zones with different pressure. Such bodies may include the rods of hydraulic and pneumatic cylinders, especially, flexible rods in the form of ropes. Conventional cable compound based on thickened petroleum oils filling the interwire space of ropes is, under the effect of pressure difference between zones of different pressure, squeezed out to the zone of lower pressure, comes out to the rope surface and is removed therefrom.
Fluid medium rushes to the thus formed voids, laying down passages in the interwire space for coming out to the zone of lower pressure while bypassing the sealing members designed to seal the outer surface of the rope. This causes a loss of seal by hydraulic cylinders with flexible rods, a reduction of working pressure and traction force of the hydraulic cylinder, as well as inconsiderable leakage of the fluid medium used as the working fluid in the hydraulic cylinder and lost irreparably in the space surrounding the cylinder.
In hoisting facilities, for example, the discharge of cable compound from the inner interwire space of the rope to the outside and the formation of interwire voids filled with corrosive medium is observed when the rope passes round a snatch pulley changing the rope direction in space, during which passage there is changed both the relative position of individual wires and of rope layers relative each other.
This is conducive to intensive corrosion of rope wires and premture failure of the rope.
In order to preclude the afore-described phenomena, it is expedient that the pores of a long-sized porous body, especially of a body such as rope, be filled with a packing substance capable of withstanding the violation of its uniformity under the effect of mechanical and hydraulic loads.
There is known a method of greasing a steel rope (cf., PCT Application No. 82/01201, Int. Cl. D 07 B 7/12// B 05 C 3/12), which comprises drawing the rope through a chamber filled with lubricant under pressure. Use is made of a fluid lubricant, preferably, machine oil, supplied to the chamber by a pump at discharge pressure. The rate of drawing the steel rope through the chamber is selected such that the spaces in the rope should absorb the oil but that there should be no efflux of oil.
However, the use of oils as packing substance does not enable one to attain internal tightness of a long-sized porous body in the form of a rope due to low resistance of fluid lubricants to shear stresses occurring during operation of ropes in supports between rope layers and individual wires under the effect of pressure difference between zones with different pressures and of rope bending loads. This results in a flow of grease in the interwire space, its extrusion outside of the rope, penetration of the working fluid inside the rope and gradual loss of seal by the higher-pressure zone filled with working fluid whose composition differs from that of the packing grease.
There is known a method of external coating of a rope by drawing it through a chambe
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Churkin Vladimir G.
Klimov Sergei B.
Negrutsky Boris F.
Negrutsky Sergei B.
Garrett Robert E.
Kapsalas George
Upravlenie po Montazhu, Demontazhu i Remontu Gornoshakhtnogo
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