Double-stroke expansion and contraction oil cylinder

Abstract

The invention discloses a double-stroke expansion and contraction oil cylinder. The double-stroke expansion and contraction oil cylinder comprises a connecting flange, a cylinder barrel and a connecting body, a first cylinder cover and a second cylinder cover are arranged on the left side and the right side of the cylinder barrel respectively, a multi-channel distributor is fixedly installed on the outer side of the connecting body, a multi-channel rotary joint is rotatably connected to the top of the multi-channel distributor, a main piston moving cavity and an auxiliary piston moving cavitywhich are coaxial are formed in the inner side of the cylinder barrel, and a movable main piston and a movable auxiliary piston are installed in the main piston moving cavity and the auxiliary pistonmoving cavity respectively; and one end of a piston rod on the main piston penetrates through the auxiliary piston and the second cylinder cover to enter a cavity of the connecting body, and the otherend of the piston rod penetrates through the first cylinder cover and the connecting flange. Compared with an existing double-stroke expansion and contraction oil cylinder, on the premise that reliable functions are guaranteed, the double-stroke expansion and contraction oil cylinder is simpler in structure and lower in manufacturing cost, an extra electrical control system does not need to be added, and operation is simplified.

Description

technical field [0001] The invention relates to the technical field of hydraulic equipment, in particular to a double-stroke expansion-contraction oil cylinder. Background technique [0002] The expansion and contraction cylinder is the key equipment on the reel of the metal strip uncoiler and coiler, and is the power source for the reel to realize expansion and contraction. [0003] At present, in order to improve production efficiency, reduce floor space, and reduce equipment costs, steel mills have gradually begun to use the reversible rolling method of two coiler reels with a single-stand rolling mill. The entry-side coiler on this reversible rolling mill The reel needs to undertake the coiling and uncoiling tasks of metal steel at the same time. Since the expanded diameter of the reel needs to have a certain amount of overexpansion relative to the theoretical inner diameter of the steel coil when it is uncoiled, and the expanded diameter of the reel should be the same ...

AI Technical Summary

Problems solved by technology

[0004] At present, there are two kinds of conventional double-stroke expansion-shrinkage cylinders, one is double-cavity double-piston double-stroke expansion-shrinkage cylinder, and the other is a double-stroke expansion-shrinkage cylinder with a displacement sensor and an electrical control system to realize cylinder stroke control. , the structure is more complex and the cost is higher

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