Construction machinery

Abstract

A hydraulic excavator includes a lower travelling body, an upper slewing body attached to the lower travelling body in a rotatable manner about a slewing axis, distance sensors, the distance sensors being capable of detecting a distance to an object to be detected, the object being located in a circumference of the lower travelling body about the slewing axis; a slewing angle sensor that detects a slewing angle of the upper slewing body with respect to the lower travelling body; and a controller that specifies an entry prohibited area in which ingress of the lower travelling body is prohibited, based on the distance detected by the distance sensors, that generates information about safety with reference to a travelling direction of the lower travelling body based on the entry prohibited area and the slewing angle detected by the slewing angle sensor, and that outputs the information.

1 . Construction machinery comprising:
 a lower travelling body;   an upper slewing body attached to the lower travelling body in a rotatable manner about a slewing axis;   distance detection means attached to the upper slewing body, the distance detection means being capable of detecting a distance to an object to be detected, the object being located in a circumference of the lower travelling body about the slewing axis;   a slewing angle detector that detects a slewing angle of the upper slewing body with respect to the lower travelling body; and   a controller that specifies an entry prohibited area in which ingress of the lower travelling body is prohibited, based on the distance detected by the distance detection means, that generates information about safety with reference to a travelling direction of the lower travelling body based on the entry prohibited area and the slewing angle detected by the slewing angle detector, and that outputs the information about the safety.   
     
     
         2 . The construction machinery according to  claim 1 , wherein
 the controller determines whether the entry prohibited area exists within at least one range of a front side detection range from a front portion of the lower travelling body to a position separated by a predetermined distance to a forward side in the travelling direction, and a rear side detection range from a rear portion of the lower travelling body to a position separated by a predetermined distance to a reverse side in the travelling direction, and outputs the information about the safety when it is determined that the entry prohibition area exists within the at least one range.   
     
     
         3 . The construction machinery according to  claim 2 , further comprising:
 a forward side restriction device that restricts travelling of the lower travelling body to a forward side in response to a command from the controller; and   a reverse side restriction device that restricts travelling of the lower travelling body to a reverse side in response to a command from the controller,   wherein the controller outputs a command to the forward side restriction device when it is determined that the entry prohibited area exists within the front side detection range, and outputs a command to the reverse side restriction device when it is determined that the entry prohibited area exists within the rear side detection range.   
     
     
         4 . The construction machinery according to  claim 3 , wherein
 the controller prohibits output of a command to the reverse side restriction device when it is determined that the entry prohibited area exists only within the front side detection range, and also prohibits output of a command to the forward side restriction device when it is determined that the entry prohibited area exists only within the rear side detection range.   
     
     
         5 . The construction machinery according to  claim 3 , wherein
 the controller is capable of outputting a command for stopping the lower travelling body with gradual deceleration to the forward side restriction device and the reverse side restriction device.   
     
     
         6 . The construction machinery according to  claim 1 , further comprising:
 notification means for notifying an operator of predetermined information,   wherein when it is determined that the entry prohibited area exists within the at least one range, the controller outputs, to the notification means, a command for notifying the operator of the determination.