Hydraulic Cylinder Meter-Out Throttle Layout for Stable Work Speed
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Solution Overview
Problem
In work machines with multiple hydraulic cylinders, improper disposition of variable throttles in the meter-out flow path can lead to excessively limited hydraulic oil flow rates, resulting in decreased cylinder speed and work efficiency.
Innovation Solution
A control system comprising multiple hydraulic pumps, flow rate control valves, and a throttle disposed in the meter-out flow path to manage the hydraulic oil flow effectively, ensuring appropriate flow rates are maintained across the hydraulic cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a variable throttle is disposed in the meter-out flow path to control hydraulic oil flow rate, then the flow rate can be adjusted, but the cylinder speed excessively decreases and work efficiency decreases
Solution Approach 1:
The patent divides the flow control function into two separate components: a flow rate control valve in the meter-in flow path that provides adjustable flow rate control, and a throttle in the meter-out flow path that maintains appropriate flow rates. This segmentation allows independent optimization of both flow adjustment capability and work efficiency, preventing the cylinder speed excessive decrease problem while preserving ease of operation.
2Ease of operation
If the flow rate of hydraulic oil is excessively limited by the throttle, then the meter-out flow path provides flow control, but the cylinder speed excessively decreases
Solution Approach 1:
The flow rate control valve acts as an intermediary component between the hydraulic pump and the hydraulic cylinder. It regulates the hydraulic oil flow rate before the oil enters the cylinder, thereby controlling the cylinder speed without causing excessive speed decrease. This intermediary control mechanism balances flow control capability with maintaining adequate cylinder speed.
3Adaptability or versatility
If multiple flow rate control valves are connected to one hydraulic cylinder, then each pump can be controlled independently, but the flow rate of hydraulic oil discharged may be excessively limited
Solution Approach 1:
The patent applies local quality by providing individual flow rate control valves for each hydraulic pump, allowing independent control of each pump's output. Simultaneously, a throttle is disposed in the meter-out flow path to maintain appropriate flow rates. This localized control approach enables versatile independent pump operation while preventing excessive flow limitation that would reduce work efficiency.
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 configuration suppresses excessive decreases in cylinder speed, thereby maintaining work efficiency by preventing excessive restriction of hydraulic oil flow rates.
Implementation Method 1
a throttle disposed in the meter-out flow path
Implementation Method 2
a plurality of flow rate control valves that are respectively connected to the plurality of hydraulic pumps and adjust a flow rate of the hydraulic oil supplied to the hydraulic cylinder
Data Source
AI summary
A control system for a work machine includes a plurality of hydraulic pumps that discharge hydraulic oil, a hydraulic cylinder that moves a working equipment element, a plurality of flow rate control valves that are respectively connected to the hydraulic pumps and adjust a flow rate of the hydraulic oil supplied to the hydraulic cylinder, a plurality of supply flow paths respectively connected to the of flow rate control valves, a meter-in flow path that connects a collective part of the supply flow paths and an inlet of the hydraulic oil in the hydraulic cylinder, a plurality of discharge flow paths respectively connected to the flow rate control valves, a meter-out flow path that connects a collective part of the discharge flow paths and an outlet of the hydraulic oil in the hydraulic cylinder, and a throttle disposed in the meter-out flow path.