Teat Cup Liner With Round-Square Transition
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Solution Overview
Problem
Existing milking machine teat cup liners either apply excessive pressure due to circular cross-sections, causing tissue irritation, or suffer from insecure seals and vacuum loss with square cross-sections, which lead to premature release during milking.
Innovation Solution
A teat cup liner design featuring a round upper portion and a square lower portion with a transitional section, allowing for a secure seal and reduced pressure application, minimizing irritation and maintaining vacuum integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circular cross-section liner barrel is used, then the seal with the teat is secure, but excessive pressure is applied causing tissue irritation
Solution Approach 1:
The liner barrel is segmented into multiple sections with different cross-sectional shapes along its length. The upper portion has a circular cross-section for secure sealing, while the lower portion has a square cross-section for reduced pressure application. This segmentation allows each section to perform its specific function optimally without compromising the other.
Solution Approach 2:
Different portions of the liner barrel are given different local geometries suited to their specific functions. The upper portion maintains a circular cross-section to match the round teat shape for secure sealing, while the lower portion transitions to a square cross-section to distribute pressure more evenly and reduce tissue irritation during the collapse phase.
2Object-affected harmful factors
If a square cross-section liner barrel is used, then pressure is reduced on the teat, but the seal becomes insecure causing vacuum loss
Solution Approach 1:
The liner barrel is divided into sections where the upper circular portion provides the seal function and the lower square portion provides the pressure reduction function. This segmentation resolves the contradiction by assigning each geometric configuration to the portion of the teat where it is most beneficial.
Solution Approach 2:
The liner barrel applies different local geometries at different positions along the teat length. The circular cross-section at the upper portion optimizes sealing against the round teat, while the square cross-section at the lower portion optimizes pressure distribution to reduce tissue irritation during collapse.
3Stress or pressure
If a square cross-section liner barrel is used, then pressure is applied from four sides, but teat tissue expands into corners causing irritation
Solution Approach 1:
The liner barrel is segmented so that the square cross-section portion is located at the lower end where it provides beneficial pressure distribution, while the upper circular portion prevents teat tissue from expanding into corners. The transition section smoothly connects these two geometries to eliminate sharp corners that could cause irritation.
Solution Approach 2:
The square cross-section is applied locally at the lower portion of the liner barrel where pressure distribution is most beneficial, while the upper portion maintains a circular cross-section to avoid corner irritation. The transition section gradually changes the geometry to eliminate abrupt corners.
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 uniform seal with minimal irritation and reduced pressure on the teat, enhancing milking efficiency and security by transitioning from a round to a square cross-section, thereby improving the milking process.
Implementation Method 1
A continuous vacuum is applied inside the liner to withdraw milk and keeps the milking unit attached to a cow.
Implementation Method 2
A continuous vacuum is applied inside the liner to withdraw milk and keeps the milking unit attached to a cow. The continuous vacuum causes congestion of blood and other fluids in teat tissue. To relieve this congestion, atmospheric air is allowed into the pulsation chamber by the pulsator so that the flexible liner collapses onto the teat to relieve the congestion in the teat tissue.
Data Source
Figure 1~5
Figure 3~4
AI summary
A milking machine teat cup liner having a dome and a barrel, and the barrel has an upper transition portion and a lower square portion. The transition section mates with the round cross-section of the dome and the square cross-section of the lower square portion to provide superior vacuum seal with less irritation and damage to teat tissue.