Crane Control System Command Coincidence Verification
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Solution Overview
Problem
Existing crane control systems fail to prevent erroneous operations despite providing operators with information about the crane's state, leading to potential misuse.
Innovation Solution
A control system with dual transmission units and reception units that require coincidence of commands from both units to operate the crane, incorporating an inching control unit for brief operations and a continuous operation control unit for sustained tasks, ensuring that the crane only operates when both commands align.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a control device informs an operator of the operation state of the overhead crane using light or sounds, then the operator can be notified of the crane's state, but the operator may still perform erroneous operations
Solution Approach 1:
A second transmission unit is introduced as an intermediary between the operator and the crane control. This unit receives commands from the operator and transmits them to the control device, which then verifies whether the command coincides with the current operation state before executing it. This intermediary layer prevents erroneous operations by adding a verification step without directly blocking the operator's ability to control the crane.
2Ease of operation
If the control device operates the crane based on a single command from one transmission unit, then the operation is simple and responsive, but erroneous operations can occur
Solution Approach 1:
The control system is segmented into multiple independent transmission units (first transmission unit for normal operations, second transmission unit for emergency or special operations). Each unit has its own reception unit in the control device, and the control logic is divided into separate processing paths that verify command coincidence before execution, thereby preventing erroneous operations while maintaining operational simplicity through clear functional separation.
3Reliability
If the control device requires coincidence of commands from multiple transmission units to operate the crane, then erroneous operations are prevented, but the system complexity increases
Solution Approach 1:
The control device is designed with multi-functionality to handle commands from multiple transmission units through a unified control logic. The same reception units and control processing circuits can accommodate commands from both the first and second transmission units, eliminating the need for completely separate control systems. This universal approach reduces overall system complexity while maintaining the coincidence verification mechanism for error prevention.
Data Source
AI summary
There is provided a control system including: a first transmission unit configured to transmit a first command directing an operation of a crane; a second transmission unit configured to transmit a second command directing an operation of the crane; and a control device including a first reception unit configured to accept the first command and a second reception unit configured to accept the second command, in which the control device is configured to operate the crane in a case in which the first command and the second command coincide with each other.