Scissor Lifting Platform Compact Structure Force Optimization
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Solution Overview
Problem
Conventional scissor lifting platforms face challenges in achieving a compact structure in the lowered position, leading to unfavorable lever geometries and increased force requirements for lifting, as the scissor bars cannot move into a completely horizontal position due to bearing constraints, resulting in higher pressure forces needed for lifting loads.
Innovation Solution
The scissor lifting platform incorporates a design with crossing lower and upper scissor bars, a lower joint connecting the lower scissor bars, an upper joint connecting the upper scissor bars, and a lifting aggregate connected to either the lower or upper scissor bar, featuring an elevating mechanism with an expansion lever and a rotatable roll to provide an increased vertical force component at low lifting heights, allowing for a compact structure and reduced component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the scissor bars are arranged in parallel in the lowered state to achieve a compact structure, then the overall height is minimized, but the lever geometry becomes unfavorable resulting in higher pressure forces required for lifting
Solution Approach 1:
The scissor bars are designed to change their relative orientation dynamically during the lifting process. In the lowered state, they are substantially parallel for compactness, but during lifting they form an angle to improve lever geometry. This dynamic reconfiguration allows the system to optimize for both compact storage and efficient force application at different operational phases.
Solution Approach 2:
The invention changes the geometric parameters of the scissor mechanism by allowing the scissor bars to form an angle rather than remaining strictly parallel. This parameter change in the bar orientation transforms the lever geometry from unfavorable to advantageous, reducing the pressure force required for lifting while maintaining the compact lowered profile.
2Ease of manufacture
If the bearing is positioned at the adjacent end of the scissor bar to simplify the structure, then the manufacturing is easier, but the lever geometry remains unfavorable requiring higher lifting forces
Solution Approach 1:
Rather than fixing the bearing at a static position that compromises lifting efficiency, the invention allows the scissor bars themselves to dynamically adjust their orientation. This dynamic approach maintains the simple bearing placement for ease of manufacture while achieving favorable lever geometry through the changing angle between scissor bars during operation.
3Force
If auxiliary cylinders are added to lift the platform at the beginning of movement to improve lifting force, then the lifting capability is enhanced, but the device complexity and manufacturing costs increase
Solution Approach 1:
The invention extracts the force multiplication function from auxiliary lifting cylinders and transfers it to the scissor bar geometry itself. By allowing the scissor bars to form an angle during lifting, the mechanical advantage is generated inherently by the geometry rather than requiring additional active lifting components, thus simplifying the overall device.
Solution Approach 2:
The scissor mechanism serves its own lifting function through geometric reconfiguration rather than requiring separate auxiliary cylinders. The primary lifting cylinder combined with the angled scissor bar arrangement provides the necessary force multiplication, allowing the system to be self-sufficient without additional complex components.
4Device complexity
If the scissor bars remain in a slight inclination in the lowered position due to bearing constraints, then the bearing structure is simpler, but the compactness is compromised and lifting forces increase
Solution Approach 1:
The invention resolves the conflict between simple bearing structure and compactness by making the scissor bar orientation dynamic. In the lowered state, the bars achieve substantial parallelism for compactness, and during lifting they naturally form an angle for mechanical advantage. This dynamic behavior allows the simple bearing structure to serve both compact storage and efficient lifting functions at different phases.
Data Source
AI summary
Embodiments of a scissor lifting platform comprising at least two crossing lower scissor bars, at least two crossing upper scissor bars articulatedly connected to the lower scissor bars, and a lower joint connecting the two lower scissor bars with each other and an upper joint connecting the two upper scissor bars with each other. Furthermore, the scissor lifting platform comprises at least one lifting aggregate connected to the lower scissor bar or the upper scissor bar and at least one rail having at least one contact area and being supported on the upper scissor bars. The upper scissor bar is articulatedly connected to the at least one rail and the other one of the upper scissor bars is guided by the at least one rail so as to be movable in a longitudinal direction when the scissor lifting platform moves. The lifting aggregate has at least one operating rod which works together with an elevating mechanism for lifting and reinforcing the vertical force up to a predetermined lifting height of the scissor lifting platform.