Browsing by Subject "hoisting machine"

Now showing 1 - 4 of 4

Access status: Open Access ,
Analiza przyczyn powstawania pęknięć zmęczeniowych w konstrukcji bębna pędnego maszyny wyciągowej
(Wydawnictwa AGH, 2005) Cichociński, Andrzej; Ładecki, Bogusław
Still in use today there are some hoisting mining machines with motion wheels, the construction of which uses ri-gid 'U' shaped diaphragms to connect side disks. In such wheels periodically, after servicing, fatigue cracks are being found. The authors performed strength analysis done by the finite elements method, and verified its results using appropriate tensammetric measurements. The measurements and analyses performed confirmed that direct cause of the fatigue cracks in the barrels is over-rigidity of the structure due to stiff diaphragms joining the wheel disks. Based on this, recommendations were issued regarding modernization of motion wheels in the discussed ho-isting machines.
Access status: Open Access ,
Breakdown of hoisting machine in mining shaft hoist installed in southern section of R-ll shaft of KGHM Polska Miedź S.A. O/ZG Rudna
(Wydawnictwa AGH, 2018) Rokita, Tomasz
This article applies to a one-of-its-kind case of the cracking of the main shaft of a hoisting machine that occurred in the southern section of the R-II shaft of KGHM Polska Miedź S.A. Oddział ZG »Rudna« in 2011. The mining shaft hoists installed in the R-II shaft are not only the basic extraction equipment in the Rudna mine but also throughout KGHM. The unscheduled standstill cases of these hoists generate huge losses for the mine. These reasons resulted in the necessity for the ad hoc repair of the damaged shaft and operational use of the hoist until a new shaft is completed and delivered. The article describes the works related to the preparation and execution of the repair of the shaft as well as the tests that were performed. The last stage was the preparation of the operational conditions of the shaft of the machine with the repaired shaft with limited kinematic parameters and under strict supervision until the execution of the new shaft.
Access status: Restricted ,
Oddziaływanie układu napędowego maszyny wyciągowej z silnikiem prądu stałego na sieć zasilającą kopalni
(Data obrony: 2017-01-23) Kieblesz, Szymon
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
The improvement of work safety and the functionality increase of operating the mine shaft hoist at the Tauron Wydobycie S.A. Z.G. Sobieski
(Wydawnictwa AGH, 2019) Gąska, Roman; Wolny, Zbigniew; Myrlak, Mariusz; Kruk, Marcin; Karpiel, Tomasz
The article presents information on changes to the mine shaft hoist in the cage compartment of the «Sobieski III» shaft of Tauron Wydobycie S.A. Z.G. Sobieski. A separate control unit based on MENTOR thyristor converters was installed in the excitation system of the drive motor and control generators, which allowed the replacement of systems that were difficult to operate, e.g. electromechanical amplifier (amplidyne) and the machine exciter of the hoist motor. Additionally, in order to stabilize the speed (especially during revision works in the shaft), the system of setting speed levels of the hoisting machine has been modified. Speed adjustment is realized by a follow-up speed control system built on the basis of a digitally controlled MENTOR reverse converter.