Laundry Press Tie Rod Structure for Fatigue Life and Preload
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Solution Overview
Problem
Laundry press rods in existing designs suffer from significant bending and loss of preload tension due to wear, leading to reduced fatigue life and inefficient fluid extraction from fabric articles.
Innovation Solution
A specially configured full-length tie rod with a reduced shank profile and slotted fastening nuts that distribute loading evenly across all threads, allowing the rod to stretch freely under tension and bending, thereby increasing fatigue life by 200% to 300%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional solid posts with threaded ends and fastening nuts are used, then the structure is simple and easy to manufacture, but the fatigue life is significantly reduced due to bending and loss of preload tension
Solution Approach 1:
The tie rod is segmented into distinct functional zones: a reduced shank portion in the center for flexible stretching, and enlarged end portions for threading and fastening. This segmentation allows the rod to bend and stretch in the center while maintaining structural integrity at the ends, significantly improving fatigue life by preventing stress concentration at the threads.
Solution Approach 2:
Different portions of the tie rod have different cross-sectional areas optimized for their specific functions. The reduced shank portion has a smaller diameter to allow flexible deformation and stress distribution, while the end portions have larger diameters to accommodate threads and fastening hardware. This local quality variation resolves the contradiction by making each section specialized for its role.
2Reliability
If fastening nuts are applied on traditional posts, then the assembly is simple, but the loading is concentrated on only 1 to 3 threads causing premature wear and loss of preload tension
Solution Approach 1:
The fastening nut is segmented with an internal slot that divides the load path. This slot configuration causes the preload tension to be distributed across multiple threads (more than 3) rather than concentrated on just 1-3 threads. The slot creates separate load-bearing zones that engage different thread sections, thereby reducing wear on individual threads and maintaining preload tension over time.
3Reliability
If the tie rod has a reduced shank profile, then the fatigue life increases by allowing free stretching, but the manufacturing precision requirements increase
Solution Approach 1:
The reduced shank profile is implemented only in the central portion of the tie rod, while the end portions maintain larger diameters for threading. This localized geometry change concentrates the manufacturing precision requirements to specific transition zones rather than the entire rod length, making the precision requirements more manageable while still achieving the fatigue life benefits in the critical center region.
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 solution significantly enhances the fatigue life of laundry press rods, ensuring more efficient fluid extraction from fabric articles by maintaining preload tension and reducing wear, resulting in improved performance and longevity.
Implementation Method 1
laundry presses remove water from washed linen by hydraulically applying pressure. This force is developed by pressurizing a hydraulic ram pressing down on linen
Implementation Method 2
The reduced shank allows the tie rod under tension and bending loading to stretch freely in the center instead of stretching where the fastening nut holds the threads of the post
Data Source
AI summary
A press for pressing batches of fabric articles to remove excess fluid therefrom utilizes a specially configured frame having upper and lower plates. The frame supports a vessel having an interior that receives a batch of fabric articles therein. A press having a ram and a disk is supported at the lower end portion of the ram. The disk engages an upper surface portion of the batch of articles. The ram and disk move between upper and lower positions, the lower position being a pressing position that engages the disk with the fabric articles. The frame includes a plurality of rods that connect to the upper and lower plates, spacing the plates apart. The rods each have upper and lower end portions, each with a diameter that is larger than the diameter of a central portion of said rod that is positioned in between the upper and lower plates.