Five-Section Lifting Column for Low Retracted Height
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Solution Overview
Problem
Conventional lifting columns have a high retracted height, making them inconvenient to handle and store, despite their adjustable height and long stroke length.
Innovation Solution
A five-section lifting column design with nested square tubes and a transmission assembly featuring sequentially connected screw rods and guide sleeves, which reduces the retracted height while maintaining a large stroke length, and includes a self-locking device and oil grooves for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional two-section or three-section lifting tubes are used to achieve longer stroke length, then the stroke length is improved, but the retracted height becomes high causing handling inconvenience
Solution Approach 1:
The patent applies nested doll principle by using a five-section lifting tube structure where each section is nested within the previous section (first tube contains second tube, which contains third tube, and so on). This nesting arrangement allows the lifting column to achieve a long stroke length when extended while maintaining a compact retracted height, directly resolving the technical contradiction between stroke length and retracted height.
2Length of moving object
If more screw rods and nuts are added to increase stroke length, then the transmission capability is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple transmission functions into a single integrated transmission assembly. The first screw rod, second screw rod, third screw rod, and fourth screw rod are combined with their respective nuts and guide sleeves to form a unified transmission system. This merging approach maintains the capability for long stroke length while reducing overall device complexity compared to having separate transmission mechanisms for each tube section.
Solution Approach 2:
The transmission assembly components are arranged in a nested configuration where screw rods and guide sleeves are positioned concentrically within each other. This nested arrangement of transmission components achieves the required stroke length transmission while minimizing the radial and axial space occupied, thereby reducing device complexity.
3Length of stationary object
If five-section lifting tube is used to reduce retracted height, then the compactness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality principle by providing guide sleeves at specific locations (upper ends of screw rods) to guide the movement of nuts. These guide sleeves ensure precise alignment and movement of the nested tube sections during assembly and operation, thereby maintaining manufacturing precision requirements manageable while achieving the compact five-section nested structure with low retracted height.
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 design achieves a low retracted height and large stroke length, ensuring compactness and ease of handling while providing reliable and smooth lifting and lowering operations.
Implementation Method 1
a lower end of the second screw rod is provided with a first nut in threaded transmission connection with the first screw rod, a lower end of the third screw rod is provided with a second nut in threaded transmission connection with the second screw rod, a lower end of the fourth screw rod is provided with a third nut in threaded transmission connection with the third screw rod, and a lower end of the first tube is provided with a fourth nut in threaded transmission connection with the fourth screw rod
Implementation Method 2
an upper end of the first screw rod is provided with a first guide sleeve that limits an axial position of the first nut, an upper end of the second screw rod is provided with a second guide sleeve that limits an axial position of the second nut, an upper end of the third screw rod is provided with a third guide sleeve that limits an axial position of the third nut, and an upper end of the fourth screw rod is provided with a fourth guide sleeve that limits an axial position of the fourth nut
Implementation Method 3
an oil groove is provided on an inner wall of each of the second screw rod, the third screw rod, and the fourth screw rod, and the oil groove is arranged axially along the respective screw rod
Implementation Method 4
A lower end of the first screw rod is sleeved with a self-locking device. The self-locking device comprises a torsion spring seat and a torsion spring sleeved over the torsion spring seat
Data Source
AI summary
A lifting column includes a drive unit, a lifting tube, and a transmission assembly. The lifting tube includes a first tube, a second tube, a third tube, a fourth tube, and a fifth tube. The transmission assembly includes a first screw rod, a second screw rod, a third screw rod, and a fourth screw rod. The drive unit is in transmission fit with the first screw rod and drives the first screw rod to rotate. A lower end of the second screw rod has a first nut in transmission with the first screw rod, a lower end of the third screw rod has a second nut in transmission with the second screw rod, a lower end of the fourth screw rod has a third nut in transmission with the third screw rod, and a lower end of the first tube has a fourth nut in transmission with the fourth screw rod.