Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Badania po odłożeniu nowoczesnych lin nośnych wielowarstwowych z wypełnieniem polimerowym

Jaśniok Mirosław, Tobys Jerzy

Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie

2024

nr 2

15--20

W artykule przedstawiono wyniki badania wybranej wielowarstwowej liny nośnej z wypełnieniem polimerowym po odłożeniu, eksploatowanej wcześniej w silnie korozyjnym środowisku szybowym. Obejmowały one badania: wizualne i magnetyczne na stanowisku pomiarowym, a następnie badania wizualne i wytrzymałościowe wybranych próbek liny w stanie rozplecionym.

The article presents selected issues of testing of multilayer ropes with polymer filling after them discarding. The main reason for the users' decision to put the ropes down was the severe corrosion of the pitting of the wires in the strands of the outer layer in the result of the ropes use in a highly corrosive environment. The results and conclusions contained in the article arise from several years of experience gained during appraisal tests of such a ropes in mining shaft hoists, and then tests of their selected sections in the laboratory of the AUTORYTET Ltd in Polkowice. The laboratory examinations included visual and magnetic tests on a measuring stand, followed by visual and strength tests of selected samples of rope in the unstranded state. The tests of the polymer-filled multilayer ropes showed the advantages of this construction. The vast majority of its wear symptoms (i.e. pitting corrosion) could be seen in the outer layer of strands, which accounts for 76% of the rope cross-sectional area. So, it can be stated that the polymer filling in the entire rope cross-section effectively protects the interior of the rope against the penetration of aggressive shaft water as well as stabilizes and separates the individual layers of strands in the rope. Detection and evaluation of corrosion progress was possible during periodic testing by magnetic and visual examinations.

Ogólne uwagi i doświadczenia z eksploatacji lin nośnych budowy zamkniętej

Tobys Jerzy

Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie

2022

nr 5

2--6

W artykule opisano doświadczenia z ponad czterdziestoletniej eksploatacji lin nośnych budowy zamkniętej w górniczych wyciągach szybowych z kołem pędnym Koepe i bębnowych. Dodatkowo omówiono zawieszenia współpracujące z tego typu linami, tzw. zawieszenia „lekkie".

The article presents the experiences from more than 40 years of use of locked-coil suspension ropes in mine hoists with Koepe wheels and drum winders. With permitted speed, lifting capacity and traffic intensity parameters (Table 1), the rope sets used at KGHM „Polska Miedź" S.A. in mine hoists with Koepe wheels and drum winders placed in a tower would work a dozen months or so (Table 2). All of them were decommissioned as a result of a „corkscrew" deformation and numerous small corrosive intrusions and individual „Z" wire cracks on the outer layer. As a result of tests of deformed sections of ropes, lubricant drying was found between the outer and the underlying layer of profiled wires, which resulted in these deformations. Ongoing lubrication of the ropes during mine operation proved unsuccessful due to: the nuisance of this method, incomplete rope lubrication, and fear of damaging and weaving out the „Z" wire. As a result, it was concluded that locked-coil ropes should not be used in high traffic extraction devices, or in exhaust and wet shafts with aggressive shaft waters. In emergency and inspection devices characterized by low traffic, with drum machines placed on shaft outsets, similar deforma¬tions of the ropes in question were identified. The conditions of operation of locked-coil suspension ropes in mine shaft hoists with a Koepe wheel drive and a winch inside the shaft outset were analyzed. In this device, due to the deflection of the rope when passing through the shaft, the traffic intensity is of great importance. Indeed, there is a limit to the number of daily cycles for a given device and locked-coil ropes. After it is surpassed, the ropes tend to degrade fast. It appears that locked-coil suspension ropes should be tested by the material expert in terms of the current condition of the lubricating coating, and ongoing lubrication of the ropes should be conducted. Where these solutions were applied, the durability of the locked-coil ropes was 15-25 years, and where they were not applied, it was 3.5-10 years.