Piston cylinder of twin-stage stroke single push rod hydraulic driver

Abstract

The invention discloses a piston cylinder of a twin-stage stroke single push rod hydraulic driver. The waist of the piston cylinder is provided with a slotted hole, and an oil passage of the slotted hole is communicated with an oil inlet hole of an electromagnetic valve. One end of the piston cylinder is arranged in a circular ring hole at the upper end of a one-way valve, and the other end of the piston cylinder is arranged in a circular ring hole of an outer shell. The piston cylinder divides the total stroke of the hydraulic driver into a service braking grade stroke and a stopping braking grade stroke, and under the cooperation with a brake or other structures, the work of the service braking grade stroke or the stopping braking grade stroke is executed respectively, so the aim of two types of working conditions under which the brake applies appropriate working breaking force in a very short time during the service braking phase and gradually applies powerful stopping braking force in a certain period of time during the stopping braking phase is fulfilled.

Description

Technical field [0001] The invention relates to a double-stage stroke single-push rod hydraulic pusher, especially the piston cylinder which plays a key role. Background technique [0002] At present, the structure of the known single push rod hydraulic pusher is that the motor is fixedly connected with the motor end cover, and the bolt passes through the mounting hole of the motor end cover and engages with the internal thread on the lower end surface of the casing; the impeller is fixedly connected on the output shaft of the motor, and the piston cylinder There is a piston in the cylinder; one end of the push rod extends out of the casing, and the other end is fixedly connected with the center of the piston; one end of the piston cylinder is installed in the ring hole at the upper end of the check valve, and the other end is installed in the ring hole of the casing. After the motor is energized, the output shaft of the motor drives the impeller to rotate and output pressur...

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Problems solved by technology

[0003] However, since the crane used in the open air needs to be able to apply a suitable working braking force in a very short period of time and gradually apply a strong parking braking force within a certain period of time, these two different working conditions are not controlled by the hydraulic pusher in the prior art. It is completed separately but is completed by the combination of hydraulic pusher and other additional devices, resulting in complex structure of equipment, difficulty in debugging, and often failures of improper cooperation between hydraulic pusher and additional devices

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