Lifting Trolley Screw Drive Mechanism for Height Adjustment
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Solution Overview
Problem
Conventional trolleys require excessive human strength and time to adjust the height of carrying racks, making it difficult to move heavy or large goods, especially in high positions, due to the need for manual operation of chains or pulley blocks.
Innovation Solution
A lifting trolley with a drive mechanism comprising a screw, nut, and power unit that automatically raises and lowers a carrying rack, eliminating the need for manual strength, and featuring a compact design with a worm shaft and worm gear for efficient operation, along with a foldable bearing mechanism and support feet for enhanced stability and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a chain is operated manually through human strength to adjust height of a carrying rack, then the carrying rack can be adjusted to different heights, but a lot of strength is demanded
Solution Approach 1:
The patent replaces the manual chain-pulling mechanism with an electric motor-driven winch system. The motor (220) is connected to a winch (201) that winds and unwinds the chain (202), automatically adjusting the carrying rack height without requiring manual force. This substitutes human mechanical effort with an electric-powered mechanical system.
Solution Approach 2:
The patent introduces a pulley block (215) as an intermediary mechanism between the chain and the carrying rack. The pulley block reduces the force required to operate the chain by providing mechanical advantage through its pulley system, acting as a mediator that amplifies the motor's output force.
2Force
If a pulley block is disposed on the trolley to reduce the strength needed, then the strength needed is reduced, but a long distance needs to be pulled when the chain is pulled by human strength through the pulley block to adjust the height of the carrying rack, thereby wasting much time
Solution Approach 1:
The patent replaces the manual chain-pulling operation with an automated electric motor system. The motor (220) drives the winch (201) to automatically wind and unwind the chain at controlled speeds, eliminating the time-consuming manual pulling operation while maintaining the force-reduction benefit of the pulley block.
Solution Approach 2:
The system performs the height adjustment operation automatically through the motor-driven winch mechanism. Once the operator activates the control switch (223), the system self-regulates the chain tension and rack position without requiring continuous manual intervention, making the system serve itself during the adjustment process.
3Ease of operation
If the bearing plate is unfolded to load goods, then goods can be loaded conveniently, but the volume of the lifting trolley increases, thereby increasing the area occupied by storage
Solution Approach 1:
The bearing plate (320) is designed with a rotatable connection to the connecting plate (310), allowing it to dynamically change from a folded position (reducing volume) to an unfolded position (increasing loading capacity). This dynamic configuration enables the structure to adapt its volume based on operational needs.
Solution Approach 2:
The bearing mechanism is divided into separable components: the connecting plate (310) that slides vertically and the bearing plate (320) that rotates for loading. This segmentation allows the bearing plate to be folded against the connecting plate when not in use, reducing overall volume, and deployed independently when loading is required.
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 lifting trolley significantly reduces the time and effort required to convey and handle goods, providing accurate positioning and reliable support, while also minimizing storage space when not in use.
Implementation Method 1
the screw is vertically pivotably connected to the trolley frame, the nut is fixed on the bearing mechanism and is connected through threads to the screw, and the power unit is fixed on one end of the trolley frame and drives the screw to rotate
Implementation Method 2
the worm shaft is connected to an output end of the power unit, the worm gear is socket-connected to and fixed on one end of the screw, and the worm gear is engaged with the worm shaft
Data Source
AI summary
The present invention relates to a trolley, and more particularly to a lifting trolley capable of raising and lowering goods. The lifting trolley includes a trolley frame, a drive mechanism, and a bearing mechanism. The bearing mechanism is vertically slidably connected to the trolley frame, and the drive mechanism is disposed on the trolley frame and drives the bearing mechanism to slide vertically. Compared with the prior art, the lifting trolley provided by the present invention saves time and effort, is accurate in positioning, and facilitates conveying of goods.