Stepped steel ball lock hydraulic cylinder

Abstract

The invention discloses a step ball lock-up hydraulic cylinder and belongs to the technical field of lock-up hydraulic cylinders, aiming to provide a step closed type lock-up hydraulic cylinder with the feature that any optional stroke thereof can be subjected to mechanical locking automatically. The technical scheme includes that an outer barrel is in threaded connection with a cylinder head, and multiple radial grooves are formed on the inner wall of the outer barrel; an inner barrel is disposed in an inner cavity of the outer barrel and in clearance fit with the inner wall of the outer barrel; a piston rod and a lock piston are arranged in an inner cavity of the inner barrel; one end of the piston rod is in clearance fit with the inner wall of the inner barrel, the other end of the piston rod runs through the cylinder head to be fixed by a nut, the inner wall of the lock piston is in clearance fit with the piston rod, an groove and a boss are arranged on the outer wall of the lock piston, and the boss is in clearance fit with the inner wall of the inner barrel; a steel-wire retainer ring is arranged at the end, away from the cylinder head, of the lock piston, the other end of lock piston is elastically connected with one end of a spring, and the other end of the spring is disposed in an inner cavity of a spring holder; one end of an oil tube penetrates an inner cavity of the piston rod to be communicated with the inner cavity of the inner barrel, and the other end of the oil tube extends out of the inner cavity of the piston rod.

Description

technical field [0001] The utility model relates to a locking hydraulic cylinder with graded steel balls, which belongs to the technical field of locking hydraulic cylinders. Background technique [0002] With the improvement of mechanization in all walks of life in the world, the application of mechanical locking hydraulic cylinders is becoming more and more extensive. The existing locking hydraulic cylinders are divided into two types: locking at both ends of the stroke and locking at the required stroke section according to the locking position. The steel ball lock is the lock at both ends of the stroke, and the lock of the stroke section needs to be in the form of interference of the mating surface, external pin balls, external compression sleeves, screw screw piston rods, and conical surface friction compression. [0003] The locking of the external pin bead and the external compression sleeve is manual locking, which is not suitable for modern operation. [0004] Scre...

AI Technical Summary

Problems solved by technology

[0004] Screw screw piston rod locking is automatic operation, but each hydraulic cylinder requires a dedicated power mechanism and power source, the additional system is complicated and the mechanism is huge, which does not meet the requirements of simple and fast equipment hardcover

[0005] The conical surface friction compression locking mechanism is simple, but the reverse thrust of the conical surface compression is limited, which does not meet the needs of large-tonnage equipment

[0006] The interference locking of the mating surface has very strict requirements on the amount of interference. If the amount of interference is large, the unlocking pressure is high, and the requirements for oil source and oil circuit are high; the amount of interference is small, the locking force is small, and the locking is unreliable. At the same time, the requirements for product raw materials, machining processes, and heat treatment are correspondingly increased, resulting in difficult processing and low yield, which is not suitable for high-efficiency development and energy consumption reduction requirements.

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