Hydraulic Actuator Flow Confluence for Faster Boom Motion
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Solution Overview
Problem
The existing hydraulic systems for working machines face issues with increased load on pumps during boom movement, leading to heat balance and fuel consumption problems, as well as decreased pump output when horsepower is controlled.
Innovation Solution
A hydraulic system with a subordinate control valve that switches between positions to either confluence or prevent the operation fluid from the second pump from reaching the first hydraulic actuator, depending on the activation state of both actuators, allowing for efficient fluid distribution and reducing unnecessary load on the second pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the third pump fluid is confluent with the first pump fluid and supplied to the boom cylinder during boom movement, then the boom can be operated, but the load to the third pump increases frequently which adversely affects heat balance and fuel consumption
Solution Approach 1:
The subordinate control valve dynamically switches between first and second positions based on the operational state of the second hydraulic actuator. When the second actuator is activated, the valve connects the third pump to the first actuator through the branched fluid tube, enabling quick operation. When the second actuator is inactivated, the valve disconnects the third pump from the first actuator, preventing unnecessary load and energy loss. This dynamic adaptation resolves the contradiction between operational readiness and energy efficiency.
2Loss of energy
If the horsepower of the pump is controlled, then energy efficiency improves, but the output amount of the pump decreases and thus the speed of the upward movement decreases
Solution Approach 1:
The system merges the fluid output from both the first pump and the third pump through the subordinate control valve to supply the first hydraulic actuator. When both pumps are active, their combined fluid flow provides sufficient speed for upward movement while maintaining energy efficiency by only engaging the third pump when the second actuator is activated, thus resolving the contradiction between energy efficiency and movement speed.
3Speed
If the subordinate control valve connects the third output fluid tube and the branched fluid tube, then the operation fluid from the second pump is supplied to the first hydraulic actuator enabling quick operation, but the load to the second pump increases when the second hydraulic actuator is inactivated
Solution Approach 1:
The subordinate control valve dynamically adjusts the fluid pathway based on the operational state of the second hydraulic actuator. In the first position, it connects the third pump to the first actuator for quick operation when both actuators are needed. In the second position, it disconnects the third pump from the first actuator when the second actuator is inactivated, preventing unnecessary power consumption. This dynamic switching resolves the contradiction between speed and power load.
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 enables quick operation of hydraulic actuators while preventing unnecessary load on the pump, thereby improving heat balance and fuel consumption by ensuring fluid confluence only when both actuators are activated.
Implementation Method 1
a subordinate control valve configured to be switched between a first position and a second position, the first position connecting the third output fluid tube and the branched fluid tube, the second position not connecting the third output fluid tube and the branched fluid tube
Data Source
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AI summary
A hydraulic system includes a first hydraulic actuator, a second hydraulic actuator, a first pump to supply operation fluid to the first hydraulic actuator, a second pump to supply operation fluid to the second hydraulic actuator, a second control valve to control operation fluid to be supplied from the second pump to the second hydraulic actuator, and a first control valve including a main control valve to control operation fluid to be supplied from the first pump to the first hydraulic actuator, and a subordinate control valve configured to control operation fluid to be supplied from the second pump to the second control valve and to the first hydraulic actuator. The operation fluid supplied from the second pump is confluent with operation fluid to be supplied from the first pump to the first pump, in a case of activating both of the first hydraulic actuator and the second hydraulic actuator.