Engraving Machine Lifting Structure with Dual Screw Sleeve Compensation
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Solution Overview
Problem
Conventional engraving machines experience instability and uneven lifting due to gaps between screw sleeves and screw rods, leading to uncoordinated height adjustments and rough operation.
Innovation Solution
The implementation of upper and lower screw sleeves with a spring mechanism between them, allowing the upper sleeve to bias upward and the lower sleeve to bias downward to compensate for gaps with the screw rods, ensuring stable engagement and smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single screw sleeve is used in the screw seat, then the structure is simple, but there is a gap between the screw sleeve and screw rod causing instability and shaking
Solution Approach 1:
The screw sleeve is divided into two separate components: an upper screw sleeve and a lower screw sleeve. Each sleeve independently engages with the screw rod, eliminating the gap problem that caused instability. The segmentation allows each sleeve to be optimally positioned and secured, providing reliable engagement without requiring a single complex adjustable sleeve.
Solution Approach 2:
The upper and lower screw sleeves act as intermediary elements between the screw seat and the screw rod. By introducing these intermediate engagement components, the patent achieves stable connection and eliminates the direct gap contact issue. The sleeves serve as mediators that ensure consistent engagement while simplifying the overall structure.
2Ease of operation
If the screw seat is directly fixed without adjustment mechanism, then the structure is stable, but the thread positions of screw rods at four corners are different causing uneven lifting
Solution Approach 1:
The screw seat is segmented into four independent screw seats, each with its own upper and lower screw sleeves. This segmentation allows each corner to be independently adjusted and engaged, ensuring that differences in thread positions across the four corners can be compensated. Each segmented unit can be optimized for its specific position, enabling coordinated lifting of the platform.
3Ease of operation
If conventional single screw sleeve engagement is used, then the structure is simple, but the lifting platform moves unevenly and operation is rough
Solution Approach 1:
By dividing the engagement system into upper and lower screw sleeves at each corner, the patent achieves smooth and coordinated lifting. Each segmented sleeve can independently engage with its corresponding screw rod, eliminating the uneven movement and rough operation caused by gap variations. The segmentation ensures consistent engagement across all corners.
Solution Approach 2:
The patent applies different engagement qualities to different locations: upper screw sleeves engage from above while lower screw sleeves engage from below. This local differentiation allows each position to be optimized for its specific engagement requirements, ensuring smooth operation and eliminating the rough movement caused by uniform single-point engagement.
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 stabilizes the engagement of screw seats with screw rods, enabling smooth and coordinated lifting of the platform, eliminating shaking and ensuring precise height adjustments.
Implementation Method 1
A spring is provided between the upper screw sleeve and the lower screw sleeve. The spring is supported between the upper screw sleeve and the lower screw sleeve, so that the upper screw sleeve can be biased upward to compensate the gap between the upper screw sleeve and a screw rod, and the lower screw sleeve can be biased downward to compensate the gap between the lower screw sleeve and the screw rod
Data Source
AI summary
A lifting structure of an engraving machine is provided. A lifting platform of the engraving machine has four pivot holes each provided with a screw seat, and is mounted with a shaft seat having a drive gear. A sprocket is provided under each screw seat. A driven gear is provided under one of the sprockets to mesh with the drive gear. The sprockets of the pivot holes are connected by a chain. The screw seat includes an upper screw sleeve, a lower screw sleeve, an upper thrust bearing, a lower thrust bearing, and a spring. The lower screw sleeve is rotatable in the pivot hole through the upper thrust bearing and the lower thrust bearing. The spring is located between the upper screw sleeve and the lower screw sleeve. Two screws pass through the upper screw seat and are screwed to the lower screw seat, respectively.