| 摘要 |
PURPOSE: A multistage double-acting hydraulic cylinder is provided to prevent friction resistance or power loss by inserting the fluid flow pipe to the cylinder, and to stream fluid through the fluid pipe in moving the cylinder back and forth by connecting cylinders without limit. CONSTITUTION: A multistage double-acting hydraulic cylinder comprises a cylinder tube(1) combined with a head cover(8) having an assembling groove(28) in the lower part, a rod cover(2) bonded with rod packing(11) in the upper part, and a contraction fluid tube(6) flowing contraction fluid in moving a cylinder(30) backward; a cylinder rod(3) inserted to the rod cover, and composed of a radial contraction rod fluid pipe hole(19), a cylinder piston(7) and a first fluid charge space part(16); an extension fluid tube(4) combined with plural O-rings(13a,13b) in the cylinder rod and the head cover by an O-ring(14), and composed of a radial extension fluid pipe hole(20) and a second fluid charge space part(17); and an extension fluid pipe rod(5) having an assembling part(24) combined with O-rings(15a,15b) in the extension fluid tube, a rod flange(12) having a fitting sill, an extension fluid passage(25) penetrating fluid for extending the cylinder in the center of the rod flange, and a contraction fluid flow pipe connected to the second fluid charge space part and spaced from the cylinder rod. The rod flange of the extension fluid pipe rod is integrally combined with the cylinder rod by an assembling unit(27).
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