Fork Leveling Oil Replenishment for Telescopic Boom Forklifts
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Solution Overview
Problem
Existing fork leveling systems in telescopic boom forklifts face difficulties in replenishing oil during automatic leveling, leading to fork tilting, manual adjustments, and oil leakage due to oil cylinder empty suction.
Innovation Solution
A fork leveling system with an active and passive leveling oil cylinder, an electric control oil supplement valve, and pressure reducing valves to ensure automatic oil replenishment, preventing oil leakage and malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic leveling function is implemented, then leveling efficiency is improved, but oil reduction in leveling oil cylinder occurs causing system failure
Solution Approach 1:
The patent applies preliminary action by providing an oil supplement valve that proactively replenishes oil to the leveling oil cylinder before the cylinder becomes empty. The control system monitors oil levels and activates the supplement valve in advance to prevent oil depletion, ensuring continuous automatic leveling operation without interruption or system failure.
Solution Approach 2:
The patent implements feedback through a control system that continuously monitors the oil level in the leveling oil cylinder and adjusts the oil supplement valve accordingly. When the oil level drops below a threshold, the control system activates the supplement valve to replenish oil, and deactivates it when the level is sufficient, creating a closed-loop control mechanism that maintains reliable operation.
2Productivity
If automatic leveling operates continuously, then productivity increases, but oil leakage from empty suction occurs
Solution Approach 1:
The system proactively supplements oil to the leveling oil cylinder before the oil level becomes critically low. By maintaining adequate oil levels in advance, the pump avoids empty suction conditions that would cause oil leakage, thereby preventing the harmful effect while maintaining continuous operation.
Solution Approach 2:
The patent converts the potential harm of oil depletion into a benefit by using the oil supplement mechanism to maintain optimal oil levels. The system transforms what would be a harmful empty suction condition into a controlled oil replenishment process, preventing leakage while ensuring continuous productive operation.
3Reliability
If manual adjustment is used to ensure fork level, then oil depletion is avoided, but leveling efficiency decreases
Solution Approach 1:
The system applies self-service by automatically monitoring its own oil level and replenishing oil through the supplement valve without requiring manual intervention. This maintains the automatic leveling function's efficiency while ensuring reliable operation, eliminating the need to switch to manual adjustment for oil management purposes.
Solution Approach 2:
The control system provides feedback-based automatic oil management that monitors oil levels and activates the supplement valve as needed. This maintains fork level accuracy through automatic control while preserving productivity by eliminating the need for manual adjustments.
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 system effectively maintains oil levels without causing other valve malfunctions, preventing fork tilting and oil cylinder leakage, ensuring efficient automatic leveling.
Implementation Method 1
an oil inlet of the electric control oil supplement valve is connected to an oil pump, and an oil outlet of the electric control oil supplement valve is connected to the rodless cavity of the active leveling oil cylinder and the rod cavity of the active leveling oil cylinder
Implementation Method 2
the oil outlet of the electric control oil supplement valve is connected to an oil inlet of the pressure reducing valve; an oil outlet of the pressure reducing valve is connected to the rodless cavity of the active leveling oil cylinder and the rod cavity of the active leveling oil cylinder
Data Source
AI summary
Disclosed are a fork leveling system and a method thereof, and a telescopic boom forklift. The fork leveling system includes an active leveling oil cylinder, a passive leveling oil cylinder and an electric control oil supplement valve, where a rodless cavity of the active leveling oil cylinder is communicated with a rodless cavity of the passive leveling oil cylinder, and a rod cavity of the active leveling oil cylinder is communicated with a rod cavity of the passive leveling oil cylinder; and an oil inlet of the electric control oil supplement valve is connected to an oil pump, and an oil outlet of the electric control oil supplement valve is connected to the rodless cavity of the active leveling oil cylinder and the rod cavity of the active leveling oil cylinder.