Sequential-action hydraulic cylinder

• Main Authors: MA SHIHU, ZENG BAOPING, YAO JIAN, WU MING, GONG YAJUN, XIANG CHAO, WANG QI, HE XUEMING, ZHANG YU, YIN HU
• Format: Patent
• Language: English
• Published: 02.12.2015
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

The invention belongs to the hydraulic technical field, and provides a sequential-action hydraulic cylinder. The sequential-action hydraulic cylinder comprises a hydraulic cylinder body, a piston rod, a lower end cover, a center pipe, a valve, a piston, a valve and the like. The hydraulic cylinder body is provided with an oil inlet and an oil outlet. The lower end cover is provided with a control oil port. The lower end of the piston rod is provided with a blind hole. The center pipe penetrates through the blind hole and is fixed to the lower end cover through a thread in a locking mode. An inner cavity of the center pipe is communicated with the control oil port. The valve is composed of a valve deck and a connecting rod. The lower end of the connecting rod of the valve is connected with the center pipe through the spring. The valve deck of the valve and the end face of the center pipe are compressed together under the effect of the spring. The diameter of a hole formed in the bottom of the piston is smaller than the diameter of the valve deck of the valve, so that it is ensured that the bottom of the piston can make contact with a flange of the valve. According to the sequential-action hydraulic cylinder, sequential-action control can be reliably and accurately achieved, the flow of hydraulic oil input into an oil path of a next-stage executing element can be ensured, and it is ensured that the piston rod outputs thrust force normally.