Upper Nipper Spring Element Sealing to Reduce Wear
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Solution Overview
Problem
Existing spring elements for combing machines suffer from high wear and tear due to soiling and material fatigue, particularly under high cycle rates and improper handling.
Innovation Solution
A spring element design featuring a compression spring between two elements connected by a connecting element, with a seal between the elements to prevent soiling and a guide sleeve to improve material pairing, reducing surface pressure and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a connecting pin is used to connect end elements in a stationary manner, then a stable longitudinal axis is determined, but high surface pressures occur resulting in high wear and tear
Solution Approach 1:
A guide bush is introduced as an intermediary component between the connecting pin and the end element. The guide bush has a bore that receives the connecting pin, allowing the pin to move axially within the bush. This intermediary element distributes the surface pressure over a larger area and reduces direct contact stress, thereby reducing wear and tear while maintaining the stable longitudinal axis function.
2Reliability
If bearing bushes are used between connecting pin and end elements, then sliding properties are improved, but stresses on contact surface between connecting pin and end element are not reduced
Solution Approach 1:
The connection structure is segmented into three distinct components: the connecting pin, the guide bush, and the end element. The guide bush is positioned between the pin and the end element, creating separate contact surfaces. This segmentation allows the pin to slide within the bush while the bush bears the contact stress from the end element, effectively reducing the stress on the pin-end element interface while maintaining good sliding properties.
3Object-affected harmful factors
If a metal or rubber bellows is provided to protect against soiling, then protection against soiling is achieved, but service life is severely limited due to damage from improper handling
Solution Approach 1:
A flexible sealing element in the form of a ring seal is used instead of a bellows structure. The ring seal is positioned in a groove within the guide bush, creating a sealing effect that protects against soiling. This simpler ring seal design is more resistant to damage from improper handling compared to bellows, while still providing effective protection against contamination of the connecting pin and spring elements.
4Volume of moving object
If the connecting pin has a small diameter, then the structure is compact, but pulsating forces result in rapid material fatigue
Solution Approach 1:
The guide bush serves as a mediator that supports the connecting pin during axial movement. The bush's bore receives the pin and provides lateral support, distributing the pulsating forces generated during compression and extension cycles. This support structure allows the pin to maintain a relatively small diameter for compactness while the guide bush absorbs and distributes the fatigue-inducing stresses, significantly improving material fatigue resistance.
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 provides resistant protection against soiling, improves the connection of end elements, and withstands high loads, leading to extended service life and reduced material fatigue.
Implementation Method 1
a compression spring (15) arranged in the longitudinal axis (2) between the first element (3) and the second element (8)
Implementation Method 2
An encapsulation of an interior space of the spring element is achieved by an overlapping of the lug of the first element with the sleeve of the second element
Implementation Method 3
The guide bush (19) is designed in such a way that the outer diameter (20) of the connecting element (17) in the region of the guide bush (19) is larger than the outer diameter (13) of the passage opening (12)
Data Source
AI summary
A spring element for an upper nipper of a combing machine has a first element with a through opening arranged transversely to a longitudinal axis. A second element has an internal thread for fastening a shaft adapter, and a guide opening with an opening width as well as a passage opening arranged in the longitudinal axis on a side of the guide opening facing away from the internal thread. A compression spring is arranged between the first and second elements. A connecting element is held in the bore of the first element and projects through the passage opening of the second element into the guide opening, the connecting element having a larger diameter than the passage opening on a side thereof opposite the first element. The first element has a tubular lug overlapping the compression spring, and the second element has a sleeve overlapping the compression spring and the lug.