Swing device of evacuator having anti-sliding device

Abstract

A swing device of an excavator has a brake channel connected to a hydraulic chamber of a brake piston, a select valve for connecting the brake channel to a brake hydraulic port or a delay channel, a spring compartment channel connected to a spring compartment and one point of the delay channel, a check valve to allow a hydraulic pressure to be supplied only in a direction from the delay channel toward the spring compartment, a spring compartment bypass channel for connecting one point of the spring compartment channel and one point of the spring compartment channel, an anti-sliding valve to block or open the spring compartment bypass channel, a slope detection sensor provided at one side of the excavator to sense a slope, and an anti-sliding valve controller for blocking or opening the anti-sliding valve based on slope information of the slope detection sensor.

1 . A swing device of an excavator having an anti-sliding device, comprising:
 a brake channel connected to a hydraulic chamber of a brake piston;   a select valve for connecting the brake channel to a brake hydraulic port or a delay channel;   a spring compartment channel having one side connected to a spring compartment of the brake piston and the other side connected to one point of the delay channel;   a check valve provided at the spring compartment channel to allow a hydraulic pressure to be supplied only in a direction from the delay channel toward the spring compartment;   a spring compartment bypass channel for connecting one point of the spring compartment channel between the spring compartment and the check valve and one point of the spring compartment channel between the check valve and the delay channel;   an anti-sliding valve provided at the spring compartment bypass channel to block or open the spring compartment bypass channel;   a slope detection sensor provided at one side of the excavator to sense a slope; and   an anti-sliding valve controller for blocking the anti-sliding valve when the excavator located on a slope and opening the anti-sliding valve when the excavator is located at a place other than a slope, based on slope information of the slope detection sensor.   
     
     
         2 . The swing device of an excavator having an anti-sliding device according to  claim 1 ,
 wherein when the brake is released in a state where the excavator is located on a slope,   the brake channel is connected to the delay channel so that a hydraulic pressure of the hydraulic chamber of the brake piston is discharged to the delay channel,   the spring compartment bypass channel is blocked to prevent a hydraulic pressure from being discharged at the spring compartment, and a travel time of the brake piston in a brake releasing direction is delayed.   
     
     
         3 . A swing device of an excavator having an anti-sliding device, comprising:
 a brake channel connected to a hydraulic chamber of a brake piston;   a select valve for connecting the brake channel to a brake hydraulic port or a delay channel;   a spring compartment channel having one side connected to a spring compartment of the brake piston and the other side connected to one point of the delay channel;   a check valve provided at the spring compartment channel to allow a hydraulic pressure to be supplied only in a direction from the delay channel toward the spring compartment;   a spring compartment bypass channel for connecting one point of the spring compartment channel between the spring compartment and the check valve and one point of the spring compartment channel between the check valve and the delay channel; and   an orifice provided on the spring compartment bypass channel to lower a discharge speed of the hydraulic pressure supplied from the spring compartment to the delay channel when the brake is released.   
     
     
         4 . The swing device of an excavator having an anti-sliding device according to  claim 3 ,
 wherein when the brake of the excavator is released,   the brake channel is blocked from the delay channel so that a pressure is supplied to the hydraulic chamber and the brake piston is to move in a direction of releasing the brake, and the discharge speed of the hydraulic pressure at the spring compartment is lowered by the orifice so that a travel time of the brake piston in a brake releasing direction is delayed.