The powered roof support is mainly used in natural hazard conditions. Natural hazards in Polish mining include methane hazards, gas and rock ejections, coal dust explosions, climate hazards, water hazards, landslides, eruptions, hydrogen sulphide hazards, radioactive substances hazards and rock mass tremors. The latter has a significant impact on the operation of powered roof support. The work analyses rock mass tremor risks in the last ten years. The study showed an intense increase in this hazard, which significantly affects the work safety of people operating machines and devices in mining excavations. The paper takes into consideration surveys carried out among employees working in conditions of rock mass shock risk. The purpose of the study was to obtain information on the safe operation of powered roof supports. The data allowed us to draw conclusions regarding the possibility of increasing work safety regarding rock mass shock risk conditions.
The powered roof support is one of the essential elements of the technical equipment of the longwall. It is responsible for the safety of machines and workers. In addition, its function is to move the entire wall complex along the operational progress of the combine. Choosing the proper powered roof support per the conditions prevailing in the wall is an important factor for safe and effective operation. The aim of the study was to assess the mining and geological conditions in Polish hard coal mines in terms of the operation of powered roof support. The author focused mainly on analysing the risk of rock mass shocks, which significantly impact the work of the powered roof support. The work describes the development of the risk of tremors in recent years. The analysis showed an intense increase in this threat. We present an analysis of rock mass shocks registered in Polska Grupa Górnicza S.A. (Polish Mining Group), the main producer of hard coal in Europe. The results presented in this paper illustrate the scale of the risk of rock mass shocks. The current state of the tremor hazard presented in the paper may be helpful information in determining the directions of development and optimisation of the powered roof support.
The stabilized remote weapons module is equipped with a fire control system for light and medium caliber weapons and can be installed on wheeled and tracked combat vehicles and tactical vehicles.The stabilized remote weapons module presented in the article is one of the proposals of Zakład Automatyki i Urządzeń Pomiarowych AREX Sp. z o.o., a member of the WB Group.AREX Sp. z o.o.deals with, among others, special production, mainly mechatronics, and its solutions are used in the electromechanical equipment of 155-mm Krab gun-howitzers and 120-mm RAK selfpropelled mortars.Operating on global markets gave an impetus to the further development of the WB Group.The remote weapons module allows you to remotely load your weapon for cocking and firing.The integrated weapons platform's remote tracking and control capabilities provide a high first-strike probability against stationary and moving targets, and can also be operated manually if necessary.The intention of the designers from AREX Sp. z o. o. was to create functional, intuitive equipment that allows the operator to focus on the task.The purpose of the publication, however, is not to present a commercial offer, but the scope of research and development works and implemented solutions, developed in response to market expectations and technical progress.The potential of the WB Group and the current state of knowledge and capabilities indicate that AREX can meet the requirements of the modern battlefield in the field of on-board weapons.
Development of a charging system ensuring the load-carrying capacity for powered roof supportThe powered roof support is an essential part of the protection of the mining wall.Its main task is to support the roof of the wall excavation and, as such, it must resist the coal mass that has the potential to collapse the mining pit.The force with which the powered roof support acts on the roof of the excavation is called load-carrying capacity.This paper describes the problem of the load-carrying capacity of powered roof support, in particular reviewing their charging systems.The research aims to ensure that the required initial load-carrying capacity is obtained and the working load-carrying capacity is maintained.This paper presents the research results of a double-block prototype equipped with an automatic charging system.We present the results of both bench and operational testing in real conditions.
