Constructive layout for small rotor of straight-flow rotary ripper

Introduction. The problem of accelerating and cheapening the construction of roads without reducing their quality can be solved by creating a complex of continuous units. Units, following each other, carry out the whole complex of works aimed at roads construction. One of the elements of the continuous unit that forms the ditch is a straight-flow rotary ripper. It was found that in order to excavate the soil near the axis of rotation of the rotor of a straight-flow rotary ripper, a small rotor with a higher angular velocity should be installed, coaxially with a large rotor. The use of straight-flow rotary rippers for soil development is constrained by insufficient theoretical substantiation of their parameters. Before analysing the interaction of the elements of the working bodies of the straight-flow rotary ripper with the soil, it is necessary to clarify the structural layout of the small rotor.

The method of research. The small rotor should contain two knives connected at the periphery by a disc to give rigidity to the knives; the cross-section of the knives is triangular with a sharpening angle of 20 °, for maximum transformation of the angle of sharpening, the knives must have a saber-shaped shape; two teeth located on the disk to loosen the soil and shift it towards the knives; a shaft tip of the small rotor, the diameter of which must exceed the width of the knife at the point of its connection with the shaft tip; a spiral knife at the end of the shaft tip to loosen the soil and shift it towards the knives. By constructing projections on the transverse-vertical plane of the blade of the knife, the tooth and the disc of the small rotor, when there is a different angle of deviation of the blade in the cutting plane, it is possible to identify the basic geometric parameters of the elements of the small rotor of the straight-flow rotary ripper. Applying the well-known formulas of theoretical mechanics, we will determine the angular velocity of the small rotor and other kinematic parameters.

Results. Based on the method of constructing a projection on the transverse-vertical plane of the blade of a knife, a tooth and a disc of a small rotor, when there is a different angle of deviation of the blade in the cutting plane, the main geometric parameters of the elements of the small rotor of a straight-flow rotary ripper are revealed. According to the formulas of theoretical mechanics, the following are determined: the circumferential velocity of the point on the surface of the shaft, the angular velocity of the small rotor, the time of one revolution of the small rotor, the path of the unit for one revolution of the small rotor. The dependence of the radius of the point on the blade of the knife of the small rotor on the angle of rotation of the beam is constructed and approximated.

Conclusion. By constructing projections on the transverse-vertical plane of the knife blade at different angles  of deflection of the blade in the cutting plane the optimal shape of the knife blade has been determined, the transformation of the angle of sharpening of the blade depending on the angle of deviation of the cutting plane from the plane perpendicular to the blade, the front, back corner of the knife blade, the profile of the blade of the small rotor knife in space was revealed, a structural layout of the small rotor was made, the circumferential velocity of the point on the surface of the shaft, the angular velocity of the small rotor, the time of one revolution of the small rotor, the path of the unit for one revolution of the small rotor are calculated.

1. Nikolayev V.A. Determination of the energy required to expose the surface of the knife and the bottom of the bulldozer blade to the ground at the beginning of the pass. The Russian Automobile and Highway Industry Journal. 2022;19 (4): 484-499. (In Russ.) https://doi.org/10.26518/2071-7296-2022-19-4-484-499

2. Nikolaev V.A. Calculation of the speed of the ramjet rotary ripper // Roads and bridges. Collection, issue 41/1. Moscow. 2019: 35-39.

3. Nikolayev V.A. Structural layout and operating parameters for a large rotor of a direct-flow bucket wheel type aggregator. The Russian Automobile and Highway Industry Journal. 2022; 19 (6): 800-813. (In Russ.) https://doi.org/10.26518/2071-7296-202219-6-800-813

4. Zykov B. I. Teorija rabochih processov stroitel’nyh mashin [Workflow theory of construction machinery]. Ja-roslavl’: Izd. JaGTU, 2003. 114 p. (in Russ.)

5. Karasjov G. N. Opredelenie sily rezanija grunta s uchjotom uprugih deformacij pri razrushenii [Definition of the cutting force of soil considering elastic deformation at fracture]. Stroitel’nye i dorozhnye mashiny. 2008; 4: 36-42. (in Russ)

6. Karnauhov A. I., Orlovskij S. N. Opredelenie zatrat udel’noj jenergii na process rezanija lesnyh pochv torcevymi frezami [Costing of specific energy on the cutting process of forest soils end mills]. Stroitel’nye i dorozhnye mashiny. 2010; 1: 20-22. (in Russ)

7. Kravec I. M. Opredelenie kriticheskoj glubiny rezanija pri kombinirovannom rezanii gruntov gidrofrezoj [Determine critical cutting depth when combined cutting soils gidrofrezoj]. Stroitel’nye i dorozhnye mashiny. 2010; 5: 47-49. (in Russ)

8. Kirillov F. F. Determinirovannaja matematicheskaja model’ vremennogo raspredelenija tjagovogo usilija dlja mnogorezcovyh rabochih organov zemlerojnyh mashin [Deterministic mathematical model of the temporal distribution of traction for mnogorezcovyh working bodies of earthmoving machines]. Stroitel’nye i dorozhnye mashiny. 2010; 11: 44-48. (in Russ)

9. Berestov E. I. Vlijanie trenija grunta po poverhnosti nozha na soprotivlenie rezaniju [Influence of friction of soil on the surface of the knife cutting resistance]. Stroitel’nye i dorozhnye mashiny. 2010; 11: 34-38. (in Russ)

10. Balovnev V. I., Nguen Z. Sh. Opredelenie soprotivlenij pri razrabotke gruntov ryhlitelem po integral’nomu pokazatelju prochnosti [Identification of resistances when designing primers Ripper by a combined indicator of strength]. Stroitel’nye i dorozhnye mashiny. 2005; 3: 38-40. (in Russ)

11. Ryabets N., Kurzhner F. Weakening of frozen soils by means of ultra-high frequency energy // Cold Regions Science and Technology. 2003. Vol. 36. P. 115-128.

12. Liu X., Liu P. Experimental research on the compressive fracture toughness of wing fracture of frozen soil // Cold Regions Science and Technology. 2011. Vol. 65. P. 421-428.

13. Talalay P. G. Subglacial till and Bedrock drilling // Cold Regions Science and Technology. 2013. Vol. 86. P. 142-166.

14. Li Q. Development of Frozen Soil Model. // Advances in Earth Science. 2006. №12. P. 96-103.

15. Atkinson J. The Mechanics of Soils and Foundations. CRC. Press. 2007. 448 p.

16. Balovnev V. I., Danilov R. G., Ulitich O. Ju. Issledovanie upravljaemyh nozhevyh sistem zemlerojno-transportnyh mashin [Study of guided knife systems of ground-moving vehicles]. Stroitel’nye i dorozhnye mashiny. 2017; 2: 12-15. (in Russ.)

17. Nilov V. A., Fjodorov E. V. Razrabotka grunta skreperom v uslovijah svobodnogo rezanija [Ground development with a scraper in free cutting conditions]. Stroitel’nye i dorozhnye mashiny. 2016; 2: 7-10. (in Russ.)

18. Kabashev R. A., Turgumbaev S. D. Jeksperimental’nye issledovanija processa kopanija gruntov rotorno-diskovymi rabochimi organami pod gidrostaticheskim davleniem [Experimental studies of the process of digging soils by rotary-disk working organs under hydrostatic pressure]. Vestnik SibADI. 2016; 4: 23-28. (in Russ.)

19. Sjomkin D.S. O vlijanii skorosti rabochego organa na silu soprotivlenija rezaniju grunta [On the impact of the speed of the working body on the force of resistance to ground cutting]. Vestnik SibADI. 2017; 1: 37-43. (in Russ.)

20. Konstantinov Ju. V. Metodika raschjota soprotivlenija i momenta soprotivlenija rezaniju pochvy prjamym plastinchatym nozhom frezy [The method of calculating resistance and the moment of resistance to soil cutting with a straight plate cutter knife]. Traktory i sel’hozmashiny. 2019; 5: 31-39. (in Russ.)

21. Syromjatnikov Ju. N., Hramov I. S., Vojnash S. A. Gibkij jelement v sostave rabochih organov rotornoj pochvoobrabatyvajushhej ryhlitel’no-separirujushhej mashiny [Flexible element in the working organs of the rotary soil processing loosening and separating machine]. Traktory i sel’hozmashiny. 2018; 5: 32-39. (in Russ.)

22. Parhomenko G. G., Parhomenko S. G. Silovoj analiz mehanizmov peremeshhenija rabochih organov pochvoobrabatyvajushhih mashin po zadannoj traektorii [Power analysis of the mechanisms of movement of working bodies of soil processing machines on a given trajectory]. Traktory i sel’hozmashiny. 2018; 1: 47-54. (in Russ.)