Research on the performance of a novel electro-hydraulic proportional directional valve with position-feedback groove

Abstract

Accurate posture control of hydraulic roof supports, which use pressurized water as their fluid power source, is an important part and research direction of intelligent fully mechanized mining face. At present, the large flow on/off directional valve used on the hydraulic roof support cannot meet the requirement of precise posture control of the roof support. To overcome the conundrum, a novel two-position three-way electro-hydraulic proportional directional flow valve for hydraulic roof support is proposed. The new valve contains two pilot stages and two main spools. The two pilot stages cooperate with each other to control the movement of the two main valve spools, which are the inlet valve spool and the outlet valve spool. The inlet valve spool adopts the Valvistor principle. The valve can realize manual pilot control and electro-hydraulic proportional flow control of the passage P-A, which has been verified by a simulation model. In this paper, the static and dynamic mathematical models of the new proportional valve are established, and the key parameters affecting the valve performances are analyzed and verified by the simulation model. An optimization control scheme is proposed to overcome the influence of supply pressure, P-A pressure difference, and nonlinear interference force on steady-state displacement and response speed of the valve. The results show that this optimization method can significantly improve the response speed of the spool and promote the linearity of spool displacement under a slope signal. In addition, the fluctuation of chamber pressure and spool displacement caused by the discontinuous flow of a fast switching valve is systematically analyzed. The analysis shows that increasing pulse-width modulation carrier frequency is an effective way to reduce fluctuation amplitude. The research provides a new design idea and control method for an electro-hydraulic proportional directional valve of hydraulic roof support.

Keywords

Directional valve water hydraulic fast switching valve proportional control simulation

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References

Hao

Wang

Malekian

, et al. A geometry surveying model and instrument of a scraper conveyor in unmanned longwall mining faces. IEEE Access 2017; 5: 4095–4103.

Wang

, et al. Study on the alignment method and experiment of scraper conveyor. J China Coal Soc 2017; 42: 3044–3050.

Lian

Yuan

Gao

, et al. Networked intelligent sensing method for powered support. J China Coal Soc 2020; 45: 2078–2089.

Liao

Lian

Feng

, et al. Effects of multiple factors on water hammer induced by a large flow directional valve. Stroj Vestn-J Mech E 2018; 64: 329–338.

Takahashi

Yamashina

Miyakawa

. Development of water hydraulic proportional control valve. In: Proceedings of the 4th JFPS international symposium on fluid power, November 14–17, Tokyo, Japan 1999, pp. 549–554. Japan: JFPS.

Yoshida

Miyakaya

. Effect of parameters on frequency characteristics of proportional control valve using tap water. In: Proceedings of the 8th JFPS international symposium on fluid power, October 25–28, Okinawa, Japan, 2011, pp. 599–604. Janpan: JFPS.

Han

Liu

, et al. A numerical investigation in characteristics of flow force under cavitation state inside the water hydraulic poppet valves. Int J Heat Mass Transfer 2017; 111: 1–16.

Han

Liu

, et al. Numerical analysis and optimisation of the flow forces in a water hydraulic proportional cartridge valve for injection system. IEEE Access 2018; 6: 10392–10401.

Andersson

. On the valvistor: a proportionally controlled seat valve. Linköping: Linköping University, 1984.

10.

Huang

Dai

Quan

, et al. Performance of proportional flow valve with pilot pressure drop-spool opening compensation. J Dyn Syst Meas Contr 2017; 139: 1–8.

11.

Liu

Jianhua

Jinhui

, et al. Hydraulic-feedback proportional valve design for construction machinery. Proc IMechE, Part C: J Mechanical Engineering Science 2015; 229: 1–17.

12.

Quan

Yan

, et al. A new kind of pilot controlled proportional direction valve with internal flow feedback. Chin J Mech Eng 2010; 23: 60–65.

13.

Hao

Quan

Huang

. Research on the performance of electro-hydraulic proportional flow valve controlled by active pilot pump. Proc IMechE, Part E: J Process Mechanical Engineering 2017; 231: 720–731.

14.

Xie

Liu

, et al. Design of pilot-assisted load control valve for proportional flow control and fast opening performance based on dynamics modeling. Sens Actuat A Phys 2015; 235: 95–104.

15.

Linjama

Paloniitty

Tiainen

, et al. Mechatronic design of digital hydraulic micro valve package. In: Proceedings of the 2nd international conference on dynamics and vibroacoustics of machines (DVM2014), September 15–17, Samara, Russia, 2015, vol. 106, pp. 97–107. North Holland Amsterdam: Elsevier Ltd.

16.

Wang

Zhang

Zhong

, et al. Study on control performance of pilot high-speed switching valve. Adv Mech Eng 2017; 9: 168781401770890.

17.

Gao

Zhu

Luo

, et al. Investigation on adaptive pulse width modulation control for high speed on/off valve. J Mech Sci Technol 2020; 34: 1711–1722.

18.

Xiong

Huang

. Performance of a flow control valve with pilot switching valve. Proc IMechE, Part I: J Systems and Control Engineering 2018; 232: 178–194.

19.

Park

. Design and performance characteristic analysis of servo valve-type water hydraulic poppet valve. J Mech Sci Technol 2009; 23: 2468–2478.

20.

Eriksson

Andersson

Palmberg

J-O

. The dynamic properties of a poppet type hydraulic flow amplifier. In: 10th Scandinavian international conference on fluid power, SICFP’07, May 21–23, Tampere, Finland 2007, pp. 161–178. Tampere: Tampere University of Technology.

21.

Wang

Zhao

Quan

, et al. Research on the dynamic and static characteristics of electro-hydraulic proportional direction valve with flow feedback. J Mech Eng 2014; 50: 205–212.

22.

Liao

Ren

Zhang

, et al. Calculation method of flow force for the directional valve used on hydraulic roof support and its application. J China Coal Soc 2019; 44: 1609–1615.