Browsing by Subject "roadheader"

Now showing 1 - 6 of 6

Access status: Open Access ,
Analysis of cutting picks trajectory and cutterhead vibrations of roadheader with use of high-speed cameras
(Wydawnictwa AGH, 2017) Mann, Rajmund; Czerwiński, Kamil; Matusik, Kamil
In order to identify the behavior of cutting picks during the process of mining with the use of a roadheader's cutterhead, an optic system has been employed. The main elements of the system were high-speed cameras. In conjunction with TEMA Motion 3D software (which is designed to analyze movement based on images registered in videos), this allowed for a detailed analysis of the trajectories of the boom, cutterheads, and cutting picks during the process of cutting. This article presents the process of conducting measurements as well as the results of a comparative analysis of the boom vibrations and movement trajectories of cutting picks on the cutterhead for selected cut types: progressive and degressive.
Access status: Open Access ,
Experimental investigation of dynamic impact of roadheader on floor
(Wydawnictwa AGH, 2018) Cheluszka, Piotr; Sobota, Piotr; Głuszek, Grzegorz
This article presents the selected results of experimental examinations performed on the test stand in the Technological Hall of the Faculty of Mining and Geology at the Silesian University of Technology in which an R-130 roadheader (by Famur S.A.) is installed. During the examinations, the courses of dynamic load were determined in the points of the roadheader's boom support during its operation. In order to determine the impact of the cutting process on the strengths transferred onto the floor, the distribution of the static load of the roadheader's supports caused by its own weight with its changing center of gravity caused by the boom deflecting were determined. During the examinations, the size and nature of the dynamic impact of the roadheader on the floor in its support points while cutting the surface of the block made of equivalent materials (cement and sand masses) of various uniaxial compressive strength (UCS) was determined experimentally. The nature of the roadheader's chassis vibrations caused by cutting as well as the changeability of the location of its anchorage point with the movement of the cutting heads on the surface being mined result in high load fitfully in the roadheader's support points. The dynamic impact of the roadheader on the floor also has a strongly dynamic character.
Access status: Open Access ,
Hardware-in-the-Loop simulation applied to roadheader cutting head speed control system testing
(Wydawnictwa AGH, 2017) Heyduk, Adam; Joostberens, Jarosław
This paper presents a description of the test stand and results of the Hardware-in-the- -Loop simulation for the angular speed control system of roadheader cutting heads. The system has been implemented in the LabView package using National Instruments cRIO and cDAQ devices. The system uses a discrete PI controller implemented with a cRIO FPGA module. Some results of simulation tests undernormal operating conditions and in emergency conditions have been presented.
Access status: Open Access ,
Rock salt production in O/ZG «Polkowice-Sieroszowice» - a case study
(Wydawnictwa AGH, 2022) Urbański, Piotr; Gawlik, Artur
The first works related to the exploration of the salt deposit in O/ZG «Polkowice-Sieroszowice» took place in 1991. At that time, a number of opening-out headings to the salt deposit from the level of the copper ore level were begun. Currently, the total length of the excavations in the salt deposit is approximately 40 km. It should be noted that, depending on the function, the volume of drifts is different, which results from the dimensions of individual excavations. The total volume of drifts in the salt deposit is estimated to be approximately 2.5 million m$^{3}$ . In the Sieroszowice mining area, salt occurs at a depth of 950 m above sea level. In November 2013, the mine obtained a license to extract rock salt from the «Bądzów» deposit (50 years). Part of the mining activities in the salt deposit are performed mechanically in a chamber system with the use of roadheaders. The applied technology for deposit extraction requires the methodology of headings mining. These headings (chambers) are made in layers, from top to bottom. The target transverse dimensions of the chambers are 15 m × 15 m (width × height) in a variety of lengths. Chambers are separated by inter- -chamber pillars 20 m wide. which should ensure the stability of the chambers and the pillars themselves. The remaining works consist of drifts driving with dimensions 7 m × 5 m (width × height). The mining works carried out so far take place more or less in the middle part of the deposit (understood in terms of thickness), and the excavations created as a result of these works are located in salts with various geomechanical parameters.
Access status: Open Access ,
Sandvik experiences with remote controlled machinery
(Wydawnictwa AGH, 2019) Nowak, Paweł Bogusław; Kilan, Łukasz
The article presents historical and current methods of controlling Sandvik machinery operating in underground mining. It indicates the direction of roadheaders development, with a special focus on various stages of introducing technical innovations that can be used in mining. The currently developed machines fit the idea of «Industry 4.0», and the solutions presented in this article allow underground plants to improve safety and productivity, making the mining branch an industrial trendsetter.
Access status: Open Access ,
Significance of cutting process parameters as related to improving dynamic state of roadheader and minimizing power consumption
(Wydawnictwa AGH, 2017) Cheluszka, Piotr; Dolipski, Marian; Sobota, Piotr
The process of mechanical excavation, especially that of hard rocks, is very dynamic. This results in heavy loads and vibrations in the cutting system of a roadheader, the drive units of the mechanism related to the excavation process, and the load-carrying structure of the roadheader. The ad verse dynamic state that stems from excessive dynamic loads or even overloading will cause a high failure rate in the roadheader and low efficiency of its operational process (high energy consumption, low productivity), thus leading to high costs of driving tunnels using the mining method involving roadheaders. This article presents selected results of extensive computer studies on the impact of cutting process conditions on the dynamic state of a boom-type roadheader equipped with transverse cutting heads and on the energy consumed during the excavation process. On one hand, cutting process conditions result from properties of an excavated rock material and, on the other hand, from process parameter values set up during the excavation of tunnels. Simulation studies conducted using experimentally verified mathematical models made it possible to identify relationhips that link dynamic loads of the body of a boom-type roadheader and energy needed for mining to the cutting process parameters of rocks with different compressive strengths. The regulation properties obtained in this way show the possibility of reducing dynamic loads of the roadheader through the proper control of cutting process parameters, including the angular speed of the cutting heads. By equipping the roadheader with a cutting head inverter drive system, it is possible to adjust the speed to the cutting process conditions by changing the supply voltage frequency of an asynchronous motor installed in the roadheader's cutting system.