Manual Valve and Accumulator for Dump Truck Platform Lowering
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Solution Overview
Problem
Existing dump truck systems require engine operation to lower the loading platform, leading to energy wastage and increased operator burden, especially during maintenance when noise reduction is necessary.
Innovation Solution
Incorporation of a manual operation valve between the hydraulic power source and hoist cylinder, allowing the loading platform to be lowered with the engine stopped, which automatically contracts the hoist cylinder, minimizing impact and enabling variable speed control to alleviate discomfort and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine is operated to lower the loading platform, then the platform can be lowered reliably, but energy is wasted and operator burden increases
Solution Approach 1:
The loading platform utilizes its own self-weight to drive the lowering operation. When the control valve unit is switched to the floating position, the platform automatically descends under gravity without requiring engine operation or external power source, achieving self-service lowering.
Solution Approach 2:
The hydraulic accumulator provides counterbalancing force to support the loading platform weight during lowering. The accumulator releases stored hydraulic energy to control the descent speed and absorb impact, enabling reliable lowering without continuous engine operation.
2Speed
If the engine is operated to lower the loading platform, then the platform can be lowered with controlled speed, but noise is generated and operator burden increases
Solution Approach 1:
The platform lowering operation is performed using the platform's own weight and the hydraulic system's stored energy, eliminating the need for engine operation and thus eliminating engine noise during the lowering process.
Solution Approach 2:
The hydraulic accumulator is pre-charged with hydraulic energy to provide cushioning during the lowering operation. This beforehand stored energy allows controlled speed regulation and impact absorption without requiring active engine operation, thereby eliminating noise.
3Use of energy by moving object
If the loading platform is lowered by self-weight without engine operation, then energy is saved, but impact occurs when platform seats on vehicle body
Solution Approach 1:
The hydraulic accumulator is pre-charged with hydraulic energy to provide cushioning during the lowering operation. When the platform approaches the vehicle body, the accumulator absorbs the impact energy through hydraulic fluid compression, preventing direct mechanical impact on the vehicle body structure.
Solution Approach 2:
The hydraulic accumulator acts as an intermediary between the loading platform and the vehicle body during lowering. It mediates the impact force by converting mechanical impact energy into hydraulic pressure energy, thereby protecting the vehicle body from direct impact while maintaining energy efficiency.
4Loss of energy
If the control valve unit is switched to floating position for lowering, then engine operation is avoided, but impact control capability is reduced
Solution Approach 1:
The hydraulic accumulator is pre-charged with hydraulic energy to provide cushioning during the lowering operation. This beforehand stored energy compensates for the loss of active impact control capability when the engine is not running, ensuring reliable impact control during passive lowering.
Solution Approach 2:
The hydraulic accumulator serves as an intermediary that provides passive impact control during floating position lowering. It replaces the active engine-driven control system by using stored hydraulic energy to regulate descent speed and absorb impact, maintaining reliability without energy waste.
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
Enables safe and efficient lowering of the loading platform without engine operation, reducing energy consumption and operator burden, while improving the durability and service life of the apparatus by minimizing impact during platform descent.
Implementation Method 1
a hydraulic power source which is constituted by a hydraulic pump rotatively driven by the engine and a tank and is adapted to supply pressure oil to the hoist cylinder
Implementation Method 2
a hoist cylinder which is telescopically provided between the loading platform and the vehicle body and in which a rod is extended so as to raise the loading platform
Implementation Method 3
the rod of the hoist cylinder is extended to raise the loading platform diagonally backward
Data Source
AI summary
A branch line branching from midway of a hydraulic conduit or each of actuator side oil passages to connect a bottom side oil chamber of a hoist cylinder to a tank is provided to the hydraulic conduit or each of the actuator side oil passages. A manual operation valve for variably adjusting the flow rate in accordance with the operation of a lever handle is provided in the branch line. Maintenance work is performed with an engine stopped in this state. Subsequently, when a vessel is lowered onto a vehicle body, hydraulic oil can be discharged through the branch line from the bottom side oil chamber of the hoist cylinder to the tank by opening the manual operation valve, so that the hoist cylinder can be automatically contracted.