Integrated Slewing Valve Block for Stable Hydraulic Braking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing lever-type slewing mechanism in backhoe loaders experiences significant swing amplitude and frequency during braking due to internal hydraulic oil movement and inertia, leading to instability and damage to components.
Innovation Solution
A hydraulic system with integrated check valves and oil circuits that control the flow direction of hydraulic oil, preventing internal pressure and flow pulsation by cutting off the oil channel between cylinders during braking, using a three-position four-way directional valve and hydraulic control check valves to manage piston rod movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the four cavities of the first and second cylinders are interconnected, then the slewing mechanism can achieve smooth rotation and bidirectional movement, but internal pressure and flow pulsation occur during braking due to inertia, causing the boom to swing several times before stopping
Solution Approach 1:
The patent segments the interconnected oil circuit into separate pathways by introducing hydraulic control check valves between the first and second cylinders. These check valves create one-way flow paths that prevent the backflow of hydraulic oil during braking, thereby eliminating the oscillation caused by interconnected cavities while maintaining smooth rotation and bidirectional movement during normal operation.
Solution Approach 2:
The hydraulic control check valves act as intermediaries in the oil circuit between the first and second cylinders. During braking, these check valves block the reverse flow of hydraulic oil, preventing the inertia-induced oscillation from propagating through the interconnected system. This intermediary mechanism resolves the contradiction by allowing free flow during operation while preventing oscillation during braking.
2Speed
If the directional valve cuts off the oil supply circuit to the hydraulic cylinder during braking, then the oil supply is stopped, but the internal hydraulic oil continues to move due to inertia, causing pressure pulsation and boom oscillation
Solution Approach 1:
The patent applies preliminary action by pre-configuring the hydraulic control check valves in the oil circuit before braking occurs. These check valves are positioned to automatically activate when braking happens, blocking the reverse flow of hydraulic oil immediately. This preliminary setup ensures that when the directional valve cuts off oil supply during braking, the check valves are already in place to prevent inertia-induced backflow and pressure pulsation, maintaining both braking speed and pressure stability.
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
Reduces swing amplitude and frequency, enhancing the stability and safety of the slewing mechanism by minimizing internal pressure and flow pulsation, thereby reducing damage to hydraulic components.
Implementation Method 1
a first hydraulic control check valve and a fourth oil circuit set in turn, a rod cavity of the second cylinder is connected to a rodless cavity of the first cylinder through a second oil circuit, a second hydraulic control check valve and a third oil circuit set in turn
Implementation Method 2
the digging working device is a large inertia body, and because the four cavities of the first and second cylinders are interconnected, the internal hydraulic oil will move, and the existence of inertia will cause internal pressure and flow pulsation
Data Source
AI summary
The invention relates to a hydraulic system, method, and integrated valve block for a slewing mechanism, comprising a first and second cylinder. The rod cavity of the first cylinder connects to the rodless cavity of the second cylinder through the first oil circuit, first hydraulic control check valve, and fourth oil circuit. The rodless cavity of the first cylinder connects to the rod cavity of the second cylinder through the second oil circuit, second hydraulic control check valve, and third oil circuit. The first oil circuit is connected to the directional valve through the sixth oil circuit, and the second oil circuit is connected to the directional valve through the fifth oil circuit. The directional valve is connected to the hydraulic pump and oil tank. The first hydraulic control check valve is installed between the first and fourth oil circuits, and the second hydraulic control check valve is between the second and third oil circuits. The check valves' control circuits connect to the sixth oil circuit, ensuring braking stability of the slewing mechanism.