Analysis characteristics determination of electrohydraulic control system operation to reduce the operation time of a powered roof support

Szurgacz, Dawid

doi:10.1051/e3sconf/20182900007

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…where c is the cutting speed constant; f is the rock's hardness coefficient; D is the outside diameter of the drill (mm); D 0 is the inner diameter of the drill (mm); "2.5~4" is the range of correction coefficients of the formula; σ is the compressive strength of the rock (MPa), and ∆ is the limit of drilling (mm). Equations ( 3) and (4) show that the values of the rock crushing work ratio E/V required when the hydraulic roof bolter drills into different rocks differ from the best hydraulic motor speed for drilling different rocks. This leads to corresponding differences in the pressure and flow of the hydraulic cylinder and hydraulic motor circuit, especially under working conditions wherein the hardness coefficients of soft and hard rocks differ greatly; these differences will have a greater impact on the stable operation of the motor.…”

Section: Mathematical Model Of Hydraulic System and Its Loadmentioning

confidence: 99%

“…Stable and efficient electro-hydraulic power system is the foundation and guarantee for improving the operation efficiency of mining equipment [3][4][5]. At present, there are many kinds of electro-hydraulic control methods [6][7][8], mainly including valve control mode based on Intelligent PI control [9,10], intelligent PID control [11,12], SMC [13][14][15][16], and pump control mode based on variable speed driver technology [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Research on Control Method of the Power System of Stepping-Type Anchoring Equipment

Guo

Wang

et al. 2021

Sensors

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To improve the roadway adaptability and control accuracy of anchoring equipment, a stepping anchoring device was designed. A permanent-magnet synchronous motor control and a harmonic suppression algorithm were integrated to optimize the dynamic control system of stepping-type anchoring equipment. The results of an experimental simulation and analysis showed that when the coefficient of coal rock hardness f = 5, 6, and 7, the pulsation coefficient of the hydraulic pump outlet pressure, hydraulic motor output speed, and pump-controlled hydraulic cylinder advance speed in the hydraulic circuit of a pump-controlled motor did not exceed 3% after the equipment based on sliding mode control (SMC) entered the steady state, while the maximum pulsation coefficient was only 32.5% of the PI control. Based on the SMC, the harmonic components of the permanent magnet synchronous motor in the power system were suppressed and compensated for. This enhanced the stiffness of the hydraulic system under motor drive. When the rock stiffness factor gradually changed from f = 5 to f = 8 and increased suddenly from f = 5 to f = 6, the pressure overshoot at the outlet of the hydraulic pump of the pump-controlled motor system was reduced from 11.19% to 7.97% and from 61.19% to 52.88%, respectively, compared with that before the optimization. It was thereby proven that SMC based on harmonic suppression can effectively reduce the system pulsation caused by the multi-factor coupling of anchoring equipment and provide technical support for the optimal control of the power system of stepping-type anchoring equipment.

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Section: Mathematical Model Of Hydraulic System and Its Loadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Control Method of the Power System of Stepping-Type Anchoring Equipment

Guo

Wang

et al. 2021

Sensors

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Dynamic Tests of a Leg in a Powered Roof Support Equipped with an Innovative Hydraulic System

Szurgacz¹,

Brodny

2018

E3S Web Conf.

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Abstract. Static and dynamic loads impact on a powered roof support during its operation. The dynamic loads lead to a number of consequences for the construction and the entire hydraulic system. With the increase of depth and intensity of exploitation, the number of events during which the dynamic load is greater increases. Therefore, it is necessary to research the whole unit of the support and its components under the impact of dynamic load. The article presents the results of tests of a hydraulic leg designed to work in the powered support and dynamically loaded with free fall drop. An innovative hydraulic system type DOH was mounted in the subject leg. As a result of the conducted tests, the dynamic parameters of the tested system were determined. The aim of the research was also to determine the impact of drop's energy on the operating parameters of the tested system. The tested hydraulic system is a part of an innovative electro hydraulic control system of the powered roof support. The Authors believe that the obtained results will allow to create opportunities for the practical application of the tested system and the entire wireless control system of the mining roof support.

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Sensing of Dynamic Loads in the Open-Cast Mine Combine

Kouziyev¹,

Krivenko²,

Chezganova³

et al. 2019

E3S Web Conf.

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Analysis characteristics determination of electrohydraulic control system operation to reduce the operation time of a powered roof support

Cited by 5 publications

References 7 publications

Research on Control Method of the Power System of Stepping-Type Anchoring Equipment

Research on Control Method of the Power System of Stepping-Type Anchoring Equipment

Dynamic Tests of a Leg in a Powered Roof Support Equipped with an Innovative Hydraulic System

Sensing of Dynamic Loads in the Open-Cast Mine Combine

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