Swing lock device for construction equipment

Abstract

A swing locking device for a construction machine is disclosed, which enables an operator in a cabin to confirm the locking/unlocking state of the locking device that locks a swing device or to operate the locking device. The swing lock device for a construction machine includes a lower driving structure, an upper swing structure mounted to swing on the lower driving structure by a swing device, a ring gear for locking the swing device formed on an outer surface of a ring gear for the swing device that forms the swing device, an actuator correspondingly formed to be tooth-engaged with the ring gear for locking the swing device to engage or disengage a locking gear fixed to a cylinder rod, an alignment setting confirmation sensor detecting whether setting is completed by the tooth-engagement between the ring gear for locking the swing device and the locking gear through driving of the actuator, and a swing lock/unlock detection sensor detecting a swing lock state in which the locking gear is engaged with the ring gear for locking the swing device or a swing unlock state in which the locking gear is disengaged from the ring gear ( 10 ) for locking the swing device through the driving of the actuator.

What is claimed is: 
     
         1 . A swing locking device for construction machine, comprising:
 a lower driving structure;   an upper swing structure mounted to swing on the lower driving structure by a swing device;   a ring gear for locking the swing device formed on an outer surface of a ring gear for the swing device that forms the swing device;   an actuator correspondingly formed to be tooth-engaged with the ring gear for locking the swing device to engage or disengage a locking gear fixed to a cylinder rod;   an alignment setting confirmation sensor detecting whether setting is completed by the tooth-engagement between the ring gear for locking the swing device and the locking gear through driving of the actuator; and   a swing lock/unlock detection sensor detecting a swing lock state in which the locking gear is engaged with the ring gear for locking the swing device or a swing unlock state in which the locking gear is disengaged from the ring gear for locking the swing device through the driving of the actuator.   
     
     
         2 . The swing locking device according to  claim 1 , wherein a hydraulic cylinder is used as the actuator. 
     
     
         3 . The swing locking device according to  claim 1 , further comprising a controller notifying an operator in a cabin of an engagement state of the locking gear and shifting a power applied to the swing device in an off state if the operator makes the locking gear engaged with the ring gear for locking the swing device through operation of a swing lock switch, and notifying the operator in the cabin of a disengagement state of the locking gear and shifting the power applied to the swing device in an on state if the operator makes the locking gear disengaged from the ring gear for locking the swing device through operation of a swing unlock switch. 
     
     
         4 . The swing locking device according to  claim 1 , wherein the alignment setting confirmation sensor comprises first and second sensors installed symmetrically on left and right sides about the locking gear to detect whether the setting is completed by the tooth-engagement between the ring gear for locking the swing device and the locking gear through the driving of the actuator. 
     
     
         5 . The swing locking device according to  claim 1 , wherein the swing lock/unlock detection sensor comprises:
 a third sensor detecting the swing lock state in which the locking gear is engaged with the ring gear for locking the swing device through expansion driving of the actuator; and   a fourth sensor detecting the swing unlock state in which the locking gear is disengaged from the ring gear for locking the swing device through contraction driving of the actuator.   
     
     
         6 . The swing locking device according to  claim 1 , wherein an indicator lamp installed in the cabin or an alarm or sound message is used as a means for notifying the operator in the cabin of whether the locking gear is engaged with or disengaged from the ring gear for locking the swing device.