Cab Interference Prevention Control for Work Machines
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Solution Overview
Problem
Conventional interference prevention control for work machines reduces work efficiency by requiring the work equipment to be placed in a standby position to avoid interference with the cab, limiting its movement and efficiency.
Innovation Solution
An interference prevention control device with a cab position sensor, tool position sensor, and solenoid-operated directional control valve to limit cab movement based on the tool's position, preventing interference and enhancing work efficiency by allowing the work equipment to move freely while ensuring the cab operates within a safe range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the work equipment is placed in a standby position to prevent interference with the cab, then interference between the cab and work equipment is prevented, but work efficiency is reduced
Solution Approach 1:
The interference prevention range is dynamically adjusted based on the actual position of the cab. When the cab is retracted, the interference prevention range is reduced, allowing the work equipment to operate in positions that would otherwise be restricted. This dynamic adjustment resolves the contradiction by adapting the safety constraints to the current operational state, preventing interference only when necessary while maximizing work efficiency.
Solution Approach 2:
The system continuously monitors the position of the cab and uses this feedback to adjust the interference prevention range in real-time. This feedback mechanism ensures that the work equipment is restricted only when the cab position indicates potential interference, while allowing full operational freedom when the cab is retracted, thus resolving the contradiction between safety and efficiency.
2Reliability
If the interference prevention range is adjusted based on cab position, then interference is prevented when cab is extended, but work equipment movement is unnecessarily limited when cab is retracted
Solution Approach 1:
The interference prevention range is made dynamic by linking it to the cab position. When the cab is retracted, the range is automatically reduced, allowing the work equipment to access positions that would otherwise be restricted. This resolves the contradiction by making the system adaptable to different cab positions rather than maintaining a fixed conservative range.
3Ease of operation
If the cab is moved to an intended working position, then cab operation flexibility is improved, but interference with work equipment may occur
Solution Approach 1:
The system continuously monitors cab position and provides feedback control by adjusting the interference prevention range accordingly. This allows the cab to move to intended working positions with flexibility while automatically preventing interference with the work equipment through real-time position-based adjustments to the safety range.
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
The solution effectively prevents cab interference with the work equipment by accurately controlling the cab's movement, prioritizing work equipment operation and maintaining high-speed, shock-free cab movement when necessary, thereby improving overall work efficiency.
Implementation Method 1
a solenoid-operated directional control valve disposed in a pilot passage of a pilot-operated control valve
Implementation Method 2
a pilot-operated control valve, and the limiting means is a solenoid-operated directional control valve disposed in a pilot passage of the pilot-operated control valve
Data Source
AI summary
The present invention provides an interference prevention control device of a work machine, wherein the interference prevention control device is capable of limiting movement of a cab based on a position of a tool and thereby preventing interference of the cab with the tool as well as improving the work efficiency of the work machine. A cab position sensor for detecting a position of a movable cab, as well as a boom angle sensor and an arm angle sensor for detecting a position of a tool at the distal end of the work equipment, are connected to a controller. Solenoid-operated directional control valves for limiting movement of a cab lifting cylinder are disposed in pilot passages of a spool of a pilot-operated control valve, and the solenoids of the solenoid-operated directional control valves are connected to the controller. Based on the positional relationship between the position of the cab (cab interference area) detected by the cab position sensor and the position of the tool detected by the boom angle sensor and the arm angle sensor, the controller controls movement of an actuator of the cab by means of the solenoid-operated directional control valves so as to prevent interference between the cab and the tool.