Electric Construction Machine Connector Current Routing
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Solution Overview
Problem
In electric construction machines, such as hydraulic excavators, there is a risk of electric current flowing into connectors that are not connected to external power supplies, leading to inefficient power distribution and potential damage.
Innovation Solution
The implementation of a detection block and switching control block that ensures only the switches associated with the connected external power supply are closed, preventing current from flowing into unconnected connectors through a common power transmission system junction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple power transmission systems are connected to a common system at a junction, then the device complexity is reduced and space is saved, but electric current may flow into unconnected connectors causing harmful effects
Solution Approach 1:
The patent applies preliminary action by equipping each connector with a detection block that detects connector connection status beforehand, and switching control blocks that proactively open switches for unconnected connectors before current can flow into them. This preventive approach eliminates the harmful effect of current flowing into unconnected connectors while maintaining the simplified common system configuration.
2Ease of operation
If switches for all connectors are kept closed for simplicity, then the ease of operation is improved, but power distribution efficiency deteriorates and damage risk increases
Solution Approach 1:
The patent implements feedback by using detection blocks to continuously monitor connector connection status and provide this information to switching control blocks. The switching control blocks automatically adjust switch states based on the detected connection status, ensuring that switches for unconnected connectors remain open. This automated feedback mechanism maintains power distribution efficiency without requiring manual intervention, thus preserving ease of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents electric current from flowing into connectors without an external power supply, enhancing power distribution efficiency and reducing the risk of damage by ensuring correct power routing.
Implementation Method 1
AC power from the external power supply is converted into DC power by the chopper device and this DC power is stepped down by the chopper device and then supplied to the internal battery
Implementation Method 2
this DC power from the internal battery is boosted by the chopper device and then the boosted power is further converted into AC power by the inverter and supplied to the electric motor
Data Source
AI summary
Provided is an electric construction machine adapted to prevent an electric current, after flowing in via a junction at which power transmission systems join together, from flowing into at least one connector to which an external power supply is not connected.Power transmission systems 71A, 71B, 71C connected to connectors 59A, 59B, 59C are all caused to join with a common system 73 at a junction before being connected to a control unit 35. The power transmission systems 71A, 71B, and 71C include switches 74Aa, 74Ab, 74Ba, 74Bb, 74Ca, 74Cb. In relay circuits 75A, 75B, 75C, when a plug for an external power supply is connected to corresponding one of the connectors 59A, 59B, 59C, connection of the corresponding connector connection detecting terminals and plug connection detecting terminals energizes a coil of the corresponding control relay (either 76A, 76B, or 76C), then after switching contact points of the corresponding control relay to a closed state, energizes coils of the corresponding switches via the contact points, and switches contact points of the corresponding switches to a closed state.