Maciej Matuszewski

Constructional Features of Ropes in Functional Units of Mining Shaft Hoist

Abstract In this paper structural analysis of steel ropes applied in mining shaft hoists was conducted. Functions of the ropes which they fulfilled in these shaft hoists were identified. Expected operational features of ropes were indicated too. An analysis was carried out four identified groups of ropes: hoisting ropes, balance ropes, leading rope and fender ropes. Basic constructional features: geometrical and material of ropes, which they should be characterized in each of mentioned functional groups were indicated. Constructional structures of mentioned steel ropes, the most often applied in domestic mining shaft hoists were described. Observed tendencies in analyzed issues also were shown.

Tribological problems in shaft hoist ropes wear process

Purpose – The purpose of this paper was to create conditions for the correct decision concerning an exchange of the used rope for a new one. A cognitive goal was to indicate the causes of its wear and determining its mechanism reliability and durability. Design/methodology/approach – The magnetic, organoleptic and strength standard tests of lifting triangle-strand ropes of a mining hoist were carried out. This way the current state of the tested rope was defined. Findings – On the basis of an analysis of the results of the performed tests: magnetic, organoleptic and fatigue tests, it can be said that the magnetic one is accurate enough only to indicate the place of the rope’s biggest weakening, though the degree of weakening is not defined precisely – with significant excess. The accurate rope’s destruction degree is indicated by the strength tests. Practical implications – The results of described investigations can improve safety of the mining rope mechanisms operation, even for an increased resource. O...

Machining process automation of large-size elements

Production process is a series of activities aimed at creating a final product for specific tasks. Its structure is first and foremost a technological process, whereby components of the product are given specific shapes and features that allow them to perform these tasks effectively. Analyzes of the possibilities and effectiveness of manufacturing activities automation were performed on the example of machine tools used for machining large parts (EWg). Such machines are increasing, as the demand for these types of devices is increasing [1, 7]. Because of their intended purpose, such machines are also characterized by large dimensions, which imply certain characteristics and limitations in the automation of their manufacturing process. An important issue is that machine tools are increasingly modular. The aim of this paper is to identify factors determining the process of manufacturing the large-size machine tools, especially in the scope of its automation. The results obtained can be useful both for the constructors and manufacturers of not only this group of technological machines.

Example of Tool with Two Numerical Controlled Axes

The paper presents the model of a numerical milling module, expanding its capabilities with two controlled axes. Device through the use of adjustable-tilt construction of two mutually perpendicular rotary axes has free access to any part of the hemisphere. It is driven by stepper motors controlled with a computer through the special LPT driver and Step2CNC software.