Rectum Cutting Venting Design to Prevent Carcass Contamination
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Solution Overview
Problem
Existing cutting devices for animal carcasses risk contaminating the meat by allowing the anal opening to turn inside out during the cutting process, leading to fecal matter release and increased contamination risk.
Innovation Solution
A cutting device with separate venting openings allowing fresh air to enter the interior drilling space, preventing the reversal of airflow, and controlling suction to contain contaminants within the annular space, ensuring a one-way airflow to flush out contaminants efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If vacuum is applied to hold skin inside the cutting device during cutting, then the cutting capability is improved, but the anal opening turns inside out causing fecal matter release and contamination
Solution Approach 1:
The interior drilling space is segmented into two separate spaces: a first interior space surrounding the mandrel and a second interior space surrounding the first interior space. This segmentation allows independent control of vacuum application in each space, enabling the vacuum to be applied to hold skin during cutting while preventing the anal opening from turning inside out by controlling the vacuum level in the second space.
Solution Approach 2:
Different vacuum levels are applied to different regions: a higher vacuum is applied to the first interior space to hold the skin firmly during cutting, while a lower or controlled vacuum is applied to the second interior space to prevent the anal opening from inverting. This local quality approach allows simultaneous achievement of cutting capability and contamination prevention.
2Manufacturing precision
If vacuum is applied to prevent skin from pressing into the carcass, then the cutting precision is improved, but contaminants are released from the rectum
Solution Approach 1:
The interior drilling space is divided into two separate spaces with independent vacuum control. The first interior space maintains sufficient vacuum for cutting precision, while the second interior space uses controlled vacuum to prevent fecal matter release, thus resolving the contradiction between cutting precision and contamination prevention.
Solution Approach 2:
The second interior space acts as an intermediary buffer zone between the high-vacuum first interior space and the external environment. This intermediary space prevents direct transmission of the strong vacuum effect to the anal opening, thereby preventing fecal matter release while maintaining cutting precision in the first space.
3Productivity
If vacuum is applied to hold the skin, then the cutting effectiveness is improved, but the airflow reversal causes contamination spread
Solution Approach 1:
The interior drilling space is segmented into two separate spaces, each with independent vacuum control and airflow management. This segmentation prevents airflow reversal by maintaining appropriate vacuum levels in each space, thus preventing contamination spread while maintaining cutting effectiveness.
Solution Approach 2:
The system monitors and controls the vacuum level in both interior spaces to maintain optimal cutting conditions while preventing contamination. By providing feedback on the vacuum level and adjusting it accordingly, the system ensures cutting effectiveness without causing airflow reversal that would spread contaminants.
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
Reduces the risk of meat contamination by containing fecal matter and other contaminants within the cutting device, maintaining a clean cutting environment and preventing their spread onto the carcass surface.
Implementation Method 1
vacuum in the prior art bung drilling process is used to provide a holding force on the skin inside the cutting device such that the knife is capable of cutting into the skin
Implementation Method 2
Parts of the rectum end portion being cut loose are thereby sucked into said outer portion of the interior space
Data Source
AI summary
A cutting device for cutting loose a rectum end portion of an animal carcass, includes: a carrying member; a drilling member rotatably mounted on the carrying member having a tubular drilling wall portion surrounding an interior drilling space; a centering mandrel arranged coaxially with the drilling wall portion, the mandrel having a leading end configured to enter an anal opening of the carcass, at least a portion of the mandrel circumferentially surrounded by the drilling wall portion so as to define an annular space circumferentially surrounding the mandrel; suction means for applying suction to the interior drilling space via one or more inlet openings. The cutting device defining one or more venting openings, different from the one or more inlet openings and different from the open cutting end, configured to allow air to enter the interior drilling space.