Conical Feed Screw for Meat Grinding Gristle Separation
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Solution Overview
Problem
Prior art meat grinding systems fail to adequately increase the velocity and pressure of material to dislodge undesirable components like gristle and bone, and the subsequent reduction in velocity and pressure hinders the centrifugal precipitation of these components for effective separation and reclamation.
Innovation Solution
A two-stage coaxial meat grinding system with a single drive shaft powering screws and knives in both grinders, featuring a first perforated plate with outlets for undesirable material and a second perforated plate with adjustable backpressure, along with conical flights that increase pressure and velocity to dislodge undesirable material and then decrease it for centrifugal precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pitch of the feed screw is reduced to increase velocity and pressure, then the material handling volume output decreases, but the centrifugal precipitation of undesirable material toward the axis is hindered
Solution Approach 1:
The feed screw is divided into multiple sections with different pitch characteristics: a first section with large pitch for high material handling volume, a second section with reduced pitch for increased velocity and pressure to dislodge undesirable material, and a third section with increased pitch for reduced pressure and velocity to facilitate centrifugal precipitation. This segmentation allows each section to optimize for its specific function.
Solution Approach 2:
Different sections of the feed screw have different pitch properties tailored to local requirements: the first section has large pitch for volume handling at the inlet, the second section has small pitch for pressure buildup near the grinding plate, and the third section has intermediate pitch for the transition zone. This local quality variation resolves the contradiction by applying appropriate pitch characteristics at appropriate locations.
2Force
If the pitch of the feed screw is reduced to increase pressure and velocity to dislodge undesirable material, then separation effectiveness improves, but the centrifugal precipitation of undesirable material toward the axis is hindered
Solution Approach 1:
The feed screw is segmented into sections with different pitch characteristics to separate the functions of pressure buildup and centrifugal precipitation. The second section with reduced pitch provides the necessary pressure to dislodge undesirable material, while the third section with increased pitch allows pressure reduction to enable effective centrifugal precipitation.
Solution Approach 2:
The pitch of the feed screw varies periodically along its length, creating zones of high pressure followed by zones of lower pressure. This periodic variation in pitch allows the system to alternately apply pressure to dislodge material and then reduce pressure to allow centrifugal precipitation, effectively resolving the contradiction between these two requirements.
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 system effectively separates and reclaims meat by increasing the velocity and pressure to dislodge undesirable material and then reducing it to facilitate centrifugal precipitation, improving the efficiency of meat grinding and reclamation processes.
Implementation Method 1
increases the hydrodynamic pressure applied to the material. The rise in pressure and velocity is proportional to the change in pitch of the feed screw
Implementation Method 2
Centrifugal force generated by the pump or rotating screw drives the meat toward the edges of the plate and concentrates the undesirable material near the center of the plate
Implementation Method 3
A pressurized system is coupled to the outlet of the second grinder to adjust the backpressure of the undesirable material on the meat in the second grinder
Data Source
AI summary
A meat grinding reclamation system is disclosed herein. The system uses a conical feed screw. The conical feed screw is provided with a shaft and two flights. The first flight changes from a constant diameter to an expanding diameter. The second flight is provided co-helically along the shaft with a portion of the first flight. As both flights expand in diameter, meat processed through the meat grinding reclamation system accelerates, dislodging undesirable material such as gristle from the meat, before the meat decreases in velocity to present the meat for further processing.