Hydraulic Control System for Leveling Oil Cylinder
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Solution Overview
Problem
Traditional leveling devices for asphalt pavement recycling equipment rely on electric control hydraulic valves, which are prone to failure, disrupting construction schedules due to their complexity and high requirements for the electric control system.
Innovation Solution
A hydraulic control system for the leveling oil cylinder using electronic control reversing valves and a cam reversing valve, allowing for independent or switched operation between electric and hydraulic control methods to enhance reliability and leveling effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electric control hydraulic valves are used for leveling control, then the leveling precision can be improved, but the system reliability deteriorates due to high requirements for electric control system and complex program control
Solution Approach 1:
The control system is segmented into two independent subsystems: electric control subsystem and hydraulic cam control subsystem. Each subsystem can independently perform leveling control, so when one fails, the other can take over, ensuring continuous operation and improving system reliability while maintaining leveling precision
Solution Approach 2:
The system changes the control mode parameter from purely electric control to a dual-mode system that can switch between electric control and hydraulic cam control. This parameter change allows the system to adapt to different operating conditions and maintain reliability while achieving precise leveling
2Extent of automation
If electric control system is used for leveling, then the automation level is improved, but the device complexity increases due to complicated program control
Solution Approach 1:
The control system is divided into electric control portion and hydraulic cam control portion, each with its own control logic. This segmentation reduces the complexity of the electric control program while maintaining high automation level, as the hydraulic cam provides automatic mechanical feedback control
Solution Approach 2:
The hydraulic cam control subsystem provides self-service automatic control through mechanical feedback mechanisms. The cam profile automatically regulates the hydraulic valve based on the leveling mechanism's position, reducing the burden on the electric control system and simplifying overall control complexity
3Measurement precision
If purely electric control is used for oil cylinder stroke control, then the control precision is improved, but the risk of construction schedule disruption increases due to electric control failure
Solution Approach 1:
The system incorporates a hydraulic cam control subsystem as a pre-prepared backup mechanism. When electric control fails, the hydraulic cam subsystem can immediately take over to maintain leveling control, cushioning against the impact of electric control failure on construction schedule
Solution Approach 2:
The system changes the control parameter from electric-only to dual-mode (electric and hydraulic cam), allowing dynamic switching based on system status. This parameter change ensures construction schedule reliability by providing an alternative control path when electric control fails, while maintaining control precision through the hydraulic subsystem
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 achieves reliable and effective leveling by combining electronic and hydraulic control methods, ensuring consistent operation and improved construction efficiency by reducing the risk of electric control system failures.
Implementation Method 1
a hydraulic pump, a two-position three-way electronic control reversing valve, a three-position four-way electronic control reversing valve, a three-position four-way cam valve and a hydraulic cylinder
Implementation Method 2
the three-position four-way cam valve is arranged on the milling drum leveling mechanism, and the end of the valve element of the three-position four-way cam valve is in contact with the ground
Implementation Method 3
Two oil outlets of the three-position four-way electronic control reversing valve are respectively connected to a front oil port and a rear oil port of the hydraulic cylinder after passing through a hydraulic lock
Data Source
AI summary
The invention discloses a hydraulic control system of a leveling hydraulic cylinder of a loading head, characterized by comprising a hydraulic pump, a two-position three-way electronic control reversing valve, a three-position four-way electronic control reversing valve, a three-position four-way cam valve and a hydraulic cylinder. The invention not only can perform leveling by using the electric control system, but also comprises the hydraulic cam valve controlling the hydraulic cylinder for self-leveling, and the two leveling manners can be independently used or switched mutually, thus achieving a better leveling effect.