Hydraulic Valve Arrangement for Tipper Body Lowering Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic systems for tipper vehicles face limitations in lowering speed and controllability, leading to unproductive periods and safety concerns due to the weight distribution and dimensions of hydraulic cylinders, which are not adequately addressed by current solutions that require additional control technology or complex piping arrangements.
Innovation Solution
A hydraulic system with a valve arrangement that allows hydraulic fluid to be discharged from the hydraulic cylinder to the sink bypassing the tilting valve, enabling a controllable effective opening cross section for increased lowering speed while maintaining proportional control, using a 3-way switch design that includes a check valve and a valvistor with adjustable orifices for progressive control behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the hydraulic cylinder dimensions are increased to provide tipping payload for lighter tipper bodies, then the tipping force is improved, but the lowering speed is reduced due to increased mass and higher sagging
Solution Approach 1:
The hydraulic system is segmented into two separate flow paths: one through the tilting valve for controlled lowering, and another through the bypass valve for rapid oil return. This segmentation allows the system to achieve both controlled lowering and fast retraction simultaneously, resolving the contradiction between tipping force and lowering speed.
Solution Approach 2:
The bypass valve acts as an intermediary component that provides an alternative flow path for hydraulic oil during lowering operation. It mediates between the need for controlled lowering (through the tilting valve) and the need for fast oil return (through the bypass), enabling both requirements to be satisfied without compromising either function.
2Speed
If a bypass valve is added to increase lowering speed, then the lowering speed is improved, but the proportional controllability is lost or requires additional control complexity
Solution Approach 1:
The bypass valve is designed with dynamic characteristics that allow it to respond automatically to pressure changes in the hydraulic system. The valve opens and closes based on pressure differential, providing automatic flow regulation without requiring external control signals, thus maintaining simplicity while enabling high lowering speed.
Solution Approach 2:
The bypass valve is designed to self-regulate its opening based on the pressure conditions in the hydraulic circuit. During lowering operation, the pressure differential automatically causes the bypass valve to open, allowing oil to flow back to the reservoir without requiring external control signals, thereby maintaining proportional controllability through the tilting valve alone.
3Speed
If the tilting valve size is increased to improve lowering speed, then the lowering speed is improved, but the device cost and system complexity increase
Solution Approach 1:
Instead of enlarging the tilting valve to increase lowering speed, the system segments the flow path by adding a separate bypass valve. This allows the tilting valve to maintain its original size and control function, while the bypass valve handles the high-flow requirement for rapid lowering, avoiding the cost and complexity of an oversized tilting valve.
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 solution enhances lowering speed and controllability without increasing control complexity or system technology, reducing idle times and improving productivity by allowing faster movement away from unloading points and avoiding height restrictions, while maintaining safety and compatibility with conventional hydraulic systems.
Implementation Method 1
at least one hydraulic cylinder as a tipping drive unit for the tipper body, at least one preferably electrically or pneumatically controllable tipping valve for controlling a lifting operation, a holding operation and a lowering operation of the hydraulic cylinder
Implementation Method 2
The tilting valve is in hydraulic connection with the hydraulic cylinder, a hydraulic fluid reservoir forming the hydraulic sink and a hydraulic pump forming the hydraulic source
Implementation Method 3
The tipper body is lowered by the corresponding switching position on the tipping valve due to the weight of the tipper body
Data Source
Figure 1
Figure 2
Figure 3a~4b
AI summary
The invention provides a hydraulic system for tilting at least one tipper body located on a tipper vehicle, comprising at least one hydraulic cylinder (24) as a tipping drive unit for the tipper body, at least one tilting valve (18) for controlling a lifting operation, a holding operation and a lowering operation of the hydraulic cylinder, at least one hydraulic sink (12) and at least one hydraulic source (16), as well as at least one valve arrangement (100) that is in hydraulic communication at least with the hydraulic cylinder (24), the tilting valve (18) and the hydraulic sink (12).Depending on the operating states of the tilting valve (18), hydraulic fluid can be supplied to the hydraulic cylinder (24) in a supply volume flow for lifting operation based on a delivery volume flow from the hydraulic source (16), and hydraulic fluid can be discharged from the hydraulic cylinder (24) in a discharge volume flow to the hydraulic sink (12) for lowering operation, bypassing the tilting valve (18). According to the invention, the valve arrangement (100) and the tilting valve (18) are designed and hydraulically connected to each other in such a way that the discharge volume flow can be continuously controlled or regulated by means of the tilting valve (18).