Polzunov Altai State Technical University, Barnaul, Russia:

A. A. Mitusov, Professor, Doctor of Engineering Sciences, anatmitusov@mail.ru

Karaganda State Technical University, Karaganda, Kazakhstan:

K. B. Kyzyrov, Professor, Candidate of Engineering Sciences
O. S. Reshetnikova, Senior Lecturer

The article describes the research aimed to find comparative qualitative and quantitative characteristics of two-stage distribution system parameters for hydraulic hammers. An emphasis is laid on assessment of influence exerted by these parameters on hydraulic loss which the power source flow rate in the power stroke by 5–10 times. The research with a view to substantiating parameters of the distributor component which is the most problematic to be designed is undertaken. The subject of the research and experiment is a hydraulic hammer model MGP-18 designed for operation in mining and construction. In the structural layout of the hammer, the valve elements of the first stage are arranged at the independent back stage of the piston. The comparative characteristics of elements are investigated by the machine method using program Research. The results show that the value of the hydraulic efficiency is extremely affected by the parameters of an accumulator, whereas the distributor and the connecting ports of the gyro unit exert lower and very weak, respectively. The distributor parameters are substantiated using program Zolotnik (means “valve” in Russian). This program allows quantification of all required geometrical parameters and makes it possible to analyze their influence on slit leakages in the cylindrical connection of the valve and sleeve, pressure loss ΔP ad the switching mechanism parameters. The results of the investigations enable recommending rational design parameters of the two-stage distribution system for hydraulic hammer model MGK-18.

1. Mitusov A. A. Double-contact hammering hydraulic motors : Theoretical framework and design. Saint-Petersburg : Izdatelstvo Politekhnicheskogo universiteta, 2013. 389 p.
2. Mitusov A.A., Mitusov P. E. Energy balance in hydraulically powered percussive motor. GIAB. 2015. No. 7. pp. 162–167.
3. Qin Zhang. Basics of Hydraulic Systems. 2^nd ed. Boca Raton : CRC Press, 2018. 338 p.
4. Sevostiyanov V. S., Uralskiy V. I., Sevostiyanov M. V., Nosov O. A. Technological stsrems and equipment for mining waste transfer and disposal : Teaching aid. Belgorod : Izdatelstvo BGTU, 2015. 320 p.
5. Tang Jiren, Lu Yiyu, Ge Zhaolong, Xia Binwei, Sun Huijuan, Du Peng. A new method of co m bined rock drilling. In ternational Journal of Mining Science and Technology. 2014. Vol. 24, Iss. 1. pp. 1–6.
6. Guo Yong, Liu Deshun, Yang Shuyi, Li Xuejun, Chen Jianwen et al. Hydraulic–mechanical coupling modeling by bond graph for impact system of a high frequency rock drill drifter with sleeve distributor. Automation in Construction. 2016. Vol. 63. pp. 88–99.
7. Ushakov L. S., Kamanin Yu. N., Klimov V. E. Optimization of rock mass breaking by planetary percussive shearing. GIAB. 2018. No. 1. pp. 175–181.
8. Boothroyd G., Dewhurst P., Knight W. Product Design for Manufacture and Assembly. 3rd ed. Boca Raton : CRC Press, 2011. 712 p.
9. Redelin R. A. Mathematical model of the hydraulic hammer road-construction machines taking into account the temperature factor. Mir transporta i tekhnologicheskikh mashin. 2013. No. 3(42). pp. 47–51.
10. Zhuravleva A. V., Eshutkin D. N., Gorin A. V., Zhuravlev A. A., Gorina M. A. Motion of piston with natural deceleration of Grade 5 percussive mechanisms. Vibrating Percussive Systems and Machines for Miing and Construction : VI International Symposium Proceedings. Orel : OGU I. S. Turgeneva, 2017. pp. 77–84.
11. Hiroki Sayama. Introduction to the Modeling and Analysis of Complex Systems: textbook. Geneseo : State University of New York, 2015. 496 p.
12. Beshenkov P. S., Polushin N. I., Gkhorbani S., Sorokin E. N. Stress distribution analysis of PDC drill bits by computer modeling. Eurasian Mining. 2017. No. 2. pp. 25–28. DOI: 10.17580/em.2017.02.06
13. Zinina I. N. Evolution of CAPP systems, or Automation of automated systems. CAD/CAM/CAE Observer. 2010. No. 5(57). pp. 52–56.
14. Ророv A. M. Increase of assembly adaptability to manufacture of a design of products in integrated systems of the automated designing. Sborka v mashinostroenii, priborostroenii. 2012. No. 1. pp. 14–19.
15. Mitusov A. A., Reshetnikova O. S. Computrer program to find output characteristics of hydraulic impact cylinder. Trudy universiteta. 2008. No. 2(31). pp. 11–13.