Abstract
The article presents an analysis and formalization of existing methods for calculating the performance of different equipment for mechanical processing of raw materials with screw working body (grinders, mixers, pumps). It is noted that these methods do not consider the presence of counterpressure at the exit, where the reverse flow of the processed raw material is observed. Thus, the calculation of performance (e.g. grinders and pumps) is carried out more simply through the use of single empirical coefficient linking the design parameters, structural and mechanical properties of raw materials and the value of counterpressure with performance. It is shown that the existing calculation methods are developed for a homogeneous medium using Newtonian isothermal models and that their adjustment to experimental data was carried out by introducing the relevant empirical coefficients. These recommendations are widely used, but they do not allow the calculation of performance based on the counterpressure. The study was conducted mathematically by the method based on the technique of «deployment of the screw channel» in the form of a rectangle covered by plate (wall of the working cylinder) and moving at a constant speed. The main attention is drawn to the assumption that the screw channel has the form of a rectangle, one side of which is equal to the depth of thread and the second side is equal to the pitch of thread. The equation linking volumetric performance with the geometric parameters of the screw, the formula for determining the volumetric performance of the reverse flow and the equation linking the actual performance of the screw with its geometrical parameters, rotation speed, counterpressure and the rheological characteristics of raw materials are developed. The value of performance loss for the screw press is calculated considering reverse flow of meat through the gap. For the first time, a method for calculating the performance of mechanical deboning screw presses is developed allowing to consider the effect of the gaps between the tip of the screw and the chamber, as well as the effect of «sleeve-screw» gaps on the value of the performance loss.
Highlights
Mechanical deboning at poultry processing plants is carried out using various types of equipment: hydraulic equipment, drum with a flexible tape, and screw presses [1]
When using screw presses for poultry deboning, there is a problem of raw material reverse flow that is effective from economic point of view
The operation principle of Unicon screw presses and the process of mechanical deboning of poultry meat using these presses is detailed in [9, 10, 11, 12]. These works show that the performance of these presses is defined both by design parameters of the screw and the strength characteristics of the processed raw materials
Summary
Mechanical deboning at poultry processing plants is carried out using various types of equipment: hydraulic equipment, drum with a flexible tape, and screw presses [1]. [10], the values of upper and lower compaction pressure were justified and calculated, at which the cutting process of undamaged muscle tissue of raw material is performed by the edges of separating holes when raw material is pressed into holes followed by cutting off the pieces of meat with the tip of rotating screw.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
