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Advancements in Civil Engineering & Technology

Study of Screw Structures in Order to Increase the Service Life

Epifantseva K* and Kulbik V

Aerospace Instrumentation, St Petersburg State University, Russia

*Corresponding author: Epifantseva K, Aerospace Instrumentation, St Petersburg State University, Bolshaya Morskaya Street, Russia

Submission: September 01, 2018;Published: September 24, 2018

DOI: 10.31031/ACET.2018.02.000537

ISSN: 2639-0574
Volume2 Issue3

Abstract

An alternative to waste incineration is municipal waste recycling by moulding in extrusion machines to make pellets to be further used in the fuel or construction industries. The profitability of a waste recycling facility is dependent on a sound choice of extrusion equipment with the best value for money [1].

Keywords: Fatigue failure; Screw; Refuse processing; Deflected mode; Mode of deformation

Introduction

The development of non-destructive testing in Saint-Petersburg State University of aerospace instrumentation (SUAI) is reflected in the appearance of new terms that are used in practice, scientific papers and technical descriptions. Non-destructive control increasingly contacts with adjacent areas involved in assessing the actual technical condition of the facilities, determining the possibility of their further operation and the terms of safe operation (resource problem). In this paper, the methods of non-destructive testing of industrial objects, as well as various types of this method, such as magnetic, electric, which are used to create new laboratory work in the educational process.

In this paper, a finite element method was used to study the auger in the program Cosmos Works [2]. Currently, the method of ultrasonic testing of welded joints is gaining popularity. But the main remains the test for bending with torsion in the Cosmos Works environment - it is the most informative and allows in the early stages to modernize the design of the screw, reduce or increase the margin of safety, increasing or decreasing the size of the leg seam. It is also possible to increase the number of stiffeners on particularly susceptible to structural failure by using alloy steels such as 14 HGAFSD or Hastelloy.

Materials and Study Methods

When modeling extruders for waste processing, much attention is paid to designing and testing the work of the auger, the main working member involved in grinding, heating and preparing for molding a plastic mass. the mass through the matrix (Figure 1). The auger compresses the mass to the accumulation point m. Pp, after which, it becomes possible to create the pressure p1 necessary to pass Only when there is a balance on both sides of the extruder, the mass can come out of the die dies. However, if the extruder is conventionally divided into 4 work areas, at the moment of increasing pressure P, MPa and the maximum loading of the screw p kg/m3, a maximum pressure area is created (in Figure 1 zone “2”), which is capable of deforming the auger [3]. In an auger machine, an increase in mass consumption requires an increase in the speed of the screw, and a corresponding increase in the loading of the screw by the material. At the same time, the pressure (Figure 1) rises to Pn, because the increased feed rates lead on the same matrix to increased friction in the die dies, which adversely affects also the maximum abrasive area for screw turns. With the auger manufacturing technology-welding the turns to the shaft by welding in CO2, cracks and loosening of the screw turns (Figure 2).

Figure 1:Screw defects - tears.


Naturally during the operation for forming RDF raw materials, it was assumed that the following load acts on the extruder screw: the torque on the coupling shaft produced by the engine is 5000 N [4-6]. The temperature of the raw material heating inside the extruder reaches 500 °C. It is necessary to determine the zones with the greatest accumulation of load, displacement, deformation (Fig- ure 2). Thus, creating the parameters that are as close as possible to the real operating conditions, it is possible to detect the most loaded zones of the structure during the research and thus to improve the screw design in the stage of design and selection of materials (Figure 3).

Figure 2:Screwing the auger into a grid using the finite element method, indicating the strength of the action on the screw.


Figure 3:Results of testing screw.


Results

The process of molding the biomass is accompanied by a sufficiently high pressure, which is necessary for the destruction of the residual fibres and the compaction of the processed batch. Along with the negative effect of pressure on the turns of the auger, with an unbalanced, unbalanced shape of the screw, the energy spent on molding [7-9].

Discussion

The Solid works software allows to simulate methods for diagnostics on the basis of application of virtual measuring instruments with minimal systematic error [10,11]. This creates ideal conditions for the creation of new technologies in the field of innovation and the development of tools for express diagnostics of most technological processes.

Summary

Figure 4:Results of stress.


In Figure 4-6 will be see results of experiment. Thus, the software allowed to identify the most dangerous areas in the zone of bright red colors, which can become a zone of fatigue destruction of the screw and bring to the blocking of the machine. In addition, these parts are subject to the most wear and the process of highly abrasive action, which will cause a decrease in pressure inside the machine body, and thus deterioration in the quality of the molded pellets. The stress and strain are inversely proportional to the displacement, which proves the maximum coefficient of pressure on the screws in this region. Therefore, the 7th and 8th turns must be welded together with the additional reinforcement rib in order to compensate the stresses [12,13].

Figure 5:Results of tensile.


Figure 6:Results of deformation screw.


Acknowledgment

The results of this work were marked on the The grant for young scientists (Government of St. Petersburg, 2017), Scholarship of the President SP-2381.2018.1.

References

  1. Title 30 Mineral Resources (2009) Code of federal regulations. Government Printing Office, Washington DC, USA, parts 700 to end, 3: 750.
  2. European Standard EN 13205 (2016) Workplace environment: Assessment of the productivity of air-borne particle concentration meters. Germany.
  3. Qingqing H, Rick H (2016) Recent trends in rock dust modifications for improved dispersion and coal dust explosion mitigation. Journal of Loss Prevention in the Process Industries 41: 121-128.
  4. Qingqing H, Honaker R (2016) Optimized reagent dosage effect on rock dust to enhance rock dust dispersion and explosion mitigation in underground coal mines. Powder Technology 301: 1193-1200.
  5. Title 30 Mineral Resources (2009). Code of federal regulations. Government Printing Office, Washington DC, USA, parts 1-199, 1: 767.
  6. Title 30 Mineral Resources (2009) Code of federal regulations. Government Printing Office, Washington DC, USA, parts 600-699, 2: 750.
  7. https://docs.cntd.ru/document/499060050.
  8. Lindenau NI, Maevskaya VM, Krylov VF, M Nedra (1977) Origin, prevention, and suppression of spontaneous fires in coal mines, p. 387.
  9. Yinlin JA, Ting R, Peter W, Zhijun W, Zhaoyang M, et al. (2016) A comparative study of dust control practices in Chinese and Australian longwall coal mines. International Journal of Mining Science and Technology 26(2): 199-208.
  10. Lebecki K (2004) Gas in mines. Katowice: The Main Institution Gornictwa, Poland, p. 399.
  11. European Standard EN 481 (1991) Determination of conventions on a fraction part for suspended solids measurement in the workplace. German version.
  12. International Standard ISO 7708 (1995) Air quality. Determination of Fractions by Particle Size for Hygiene-Related Fractions.
  13. Epifancev K (2018) Investigation of zones of fatigue failure of screws conference proceedings analytical methods on fire and environmental science. Technical University in Zvolen, Slovakia, pр. 44-48.

© 2018 Epifantseva K. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and build upon your work non-commercially.



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