External Cable Connection Box for Electric Work Machines
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Solution Overview
Problem
The connection of a power feed cable to the power receiving device in electric work machines, such as hydraulic excavators, is complicated and difficult due to the location of the connection unit inside the power receiving device, making it hard for workers to access and requiring many man-hours.
Innovation Solution
The connection unit is positioned outside the power receiving device in a connection box, allowing easy access and efficient connection of the power feed cable to the machine body, with the connection box having an opening for easy viewing and protection of the connection unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection unit is located inside the power receiving device, then the power feed cable can be connected to the power receiving device, but the connection work becomes complicated and requires many man-hours due to difficult worker access
Solution Approach 1:
The connection unit is extracted from the power receiving device and positioned in a location that is easily accessible to workers, such as the rear surface of the upper slewing body. This separation allows the connection work to be performed externally without requiring workers to access the interior of the power receiving device, thereby significantly reducing the complexity and time required for connection operations while maintaining reliable electrical connection
2Reliability
If the connection unit is located inside the power receiving device, then the power feed cable connection can be established, but the connection work requires drawing the cable into the device and performing connection work inside, making it extremely complicated
Solution Approach 1:
The connection unit is extracted from the power receiving device and positioned externally where workers can easily access it. This allows the power feed cable to be connected without needing to draw it into the power receiving device interior, eliminating time-consuming operations and reducing the overall connection time significantly while ensuring reliable electrical connection
Solution Approach 2:
The connection unit is pre-positioned in an easily accessible location on the upper slewing body, such as the rear surface, before the connection operation begins. This preliminary positioning of the connection unit allows workers to perform the connection work efficiently without needing to access the interior of the power receiving device, thereby reducing the time required for connection operations
Data Source
AI summary
Provided is an electric work machine powerable by an external power supply through a power supply cable. The electric work machine includes a machine body including an electric motor, a power receiving device supplied with power through the power feed cable, connection wires extending from the power receiving device, a power feed cable connected to the machine body and a connection unit. The connection unit is disposed outside the power receiving device and connects the power feed cable and the connection wires to each other.