Electric construction machine

Abstract

An electric construction machine that enables quick and easy replacement of the battery device with different types of battery devices is provided. An upper swing structure has a vehicle main body and a vehicle rear part. The battery device is mounted on the vehicle rear part and the vehicle rear part is attachable and detachable to/from a vehicle body frame of the vehicle main body using a bolt. A main frame overhangs and extends in a longitudinal direction to reach the underside of the vehicle rear part. The vehicle rear part also includes a rear frame to be mounted on the main frame and is fixed with the bolt and a rear cover covering the rear frame forming a battery compartment, and having a shape imitating a counter weight.

1 . An electric construction machine having a battery device mounted on a rear part of a vehicle body thereof, the electric construction machine performing operations by driving an electric motor with the battery device,
 wherein the vehicle body is made up of a vehicle main body and a vehicle rear part,   wherein the vehicle main body includes a vehicle body frame to whose front a work implement is attached and a cab seat and a machine room, the cab seat and the machine room being provided on the vehicle body frame,   wherein the vehicle body frame includes a main frame to whose front the work implement is attached,   wherein the main frame has an overhanging part overhanging and extending in a longitudinal direction to reach the underside of the vehicle rear part,   wherein the vehicle rear part includes a rear frame to be mounted on the overhanging part and a rear cover covering the rear frame, the rear cover forming therein a battery room in which the battery device is arranged and having a shape imitating a counter weight, and   wherein the rear frame mounted on the overhanging part is fixed on the overhanging part using a bolt and is detachable from the overhanging part by removing the bolt.   
     
     
         2 . The electric construction machine according to  claim 1 , wherein
 the overhanging part of the main frame of the vehicle main body includes two longitudinal ribs overhanging and extending in parallel in the longitudinal direction to reach the underside of the rear frame of the vehicle rear part, and   the rear frame of the vehicle rear part includes a base frame which couples with the two longitudinal ribs of the main frame from above, and   the base frame mounted on the two longitudinal ribs of the main frame is fixed on the two longitudinal ribs using the bolt.   
     
     
         3 . The electric construction machine according to  claim 2 , wherein
 fixing means for fixing the base frame on the two longitudinal ribs of the main frame includes not only the bolt but also two positioning pins provided corresponding to the two longitudinal ribs of the main frame, and   the base frame mounted on the two longitudinal ribs of the main frame is fixed on the two longitudinal ribs and prevented from coming off using the two positioning pins and the bolt, the base frame being detachable from the two longitudinal ribs by removing the positioning pins and the bolt.   
     
     
         4 . The electric construction machine according to  claim 2 , wherein
 the base frame includes two side plates to be arranged inside the two longitudinal ribs, a base plate connecting lower ends of the two side plates, and outward horizontal flanges provided at upper ends of the two side plates, respectively, and   the base frame is mounted on the two longitudinal ribs by making the horizontal flanges be supported on upper ends of the two longitudinal ribs.   
     
     
         5 . The electric construction machine according to  claim 2 , wherein
 the base frame has a support part to be used for setting the vehicle rear part on forks of a forklift, the support part being provided on the lower surface of the base frame and between the two longitudinal ribs of the main frame, and   the vehicle rear part is movable with respect to the vehicle main body using the forklift.   
     
     
         6 . The electric construction machine according to  claim 2 , wherein:
 the vehicle rear part further includes at least one rear post erected on a rear part of the base frame and a battery storage structure for storing the battery device, the battery storage structure being attached on the base frame with bolts and,   the rear post and the battery storage structure are equipped with wire attaching parts, and   the vehicle rear part is movable with respect to the vehicle main body by using a crane by attaching wires for the crane to the wire attaching parts.   
     
     
         7 . The electric construction machine according to  claim 2 , wherein
 the base frame has a plurality of mount rubbers attached thereon at prescribed intervals in the longitudinal direction, and   the vehicle rear part further includes a battery storage structure attached on the base frame with bolts via the mount rubbers and storing the battery device.   
     
     
         8 . The electric construction machine according to  claim 7 , wherein
 the battery storage structure has a plurality of wire attaching parts, and   the battery storage structure is movable in the vertical direction with respect to the base frame by using a crane by attaching wires for the crane to the wire attaching parts.   
     
     
         9 . The electric construction machine according to  claim 2 , wherein
 the vehicle rear part further includes a battery storage structure attached on the base frame and storing the battery device,   the battery storage structure includes a battery table mount mounted on the base frame and multiple stages of battery tables mounted on the battery table mount,   a battery table as the lowermost one of the multiple stages of battery tables is fixed on the battery table mount using bolts, and   the multiple stages of battery tables are supported to be separate from each other in the vertical direction via posts and are integrated by fixing upper and lower ends of each of the posts to corresponding battery tables with bolts.   
     
     
         10 . The electric construction machine according to  claim 1 , wherein
 the vehicle main body includes the cab seat provided on the vehicle body frame and a machine room in which a plurality of devices including the electric motor and an inverter for controlling the electric motor are arranged, and   the rear cover included in the vehicle rear part and having the shape imitating the counter weight covers a rear part, a right-hand part, a left-hand part and a top part of the vehicle rear part, and   the machine room is separated from the other parts of the vehicle main body by a partition plate, and   when the vehicle rear part is connected with the vehicle main body, the battery room formed by the rear cover secures a space insulated from heat sources in the machine room by using the partition plate, the space preventing effects of heat on batteries of the battery device arranged in the battery room.