• Analysis of theoretical studies on improving the design and technological scheme of a hydraulic ram pumping unit

    pg(s) 43-44

    The analysis of the theoretical studies carried out on the technological process of the hydraulic ram method of water lifting from watercourses to improve the design and technological scheme of a hydraulic ram pumping unit is given.
    The design and technological scheme of an improved hydraulic ram pumping unit developed at Kazakh National Agrarian Research University for water lifting from watercourses for watering pastures and irrigation of land plots of peasant and farm farms of the agro–industrial complex of the Republic of Kazakhstan is presented and theoretical prerequisites for determining the main parameters of a hydraulic ram pumping unit and the main criteria for their improvement are given.

  • Evolution of the main movement drive of metallic machinery

    pg(s) 37-39

    The article illustrates how, taking into account the achievements in science and technology, the kinematic chain from the driving force (engine) to the executive body (spindle) was shortened and became the shortest in the form of a motor-spindle. On the examples of lathes and milling machines, places of possible limitation of spindle rotation frequencies are highlighted. A self-acting motor-spindle, which has rotary and translational motion, is proposed.

  • Exergy analysis of a complex three-cylinder steam turbine at various loads

    pg(s) 3-6

    Exergy analysis results for the Whole observed steam Turbine and each of her cylinders at three loads are presented in this paper.
    Observation of all cylinders shows that LPC (Low Pressure Cylinder) is the dominant mechanical power producer at the highest observed load, while at partial loads the dominant mechanical power producer is IPC (Intermediate Pressure Cylinder). At Load 100% Whole Turbine produces mechanical power equal to 341.11 MW. IPC is the cylinder with the lowest exergy destruction and the highest exergy efficiency (higher than 95%) at all observed loads. The exergy efficiency of the Whole Turbine (WT) continuously increases during the increase in turbine load (WT exergy efficiency is the lowest at Load 50% and equal to 91.36%, while at the Load 100% WT exergy efficiency is the highest and equal to 92.93%). Analyzed turbine is projected to operate dominantly on the Load 100% because at that load the exergy efficiencies of all cylinders and Whole Turbine are higher than 91%.

  • Permissible number of switches on per hour of electric motors for horizontally moving crane mechanisms

    pg(s) 308-313

    Paper deals with determining the permissible number of switches on per hour depending on the load and operating mode parameters – starting and stopping times, pause duration, etc. The criterion is that the overheating of the stator winding does not exceed the overheating at nominal mode and load. The basis of the chosen method is the assumption that the electric motor is assumed to be a conditionally uniform body, i.e. a body made of the same material with an infinitely large thermal conductivity and therefore having the same temperature throughout its volume under all possible modes and loads. The results of the calculations with a computer program
    implemented are presented in tabular form.

  • Industry 4.0 Approach for Development of Automatic Sanitation Unit

    pg(s) 305-307

    In wet wipe machines, equipment such as tanks, pumps, pipes, and valves that come into contact with the wet wipe solution, conveyor belts, and steel surfaces with which the liquid comes into contact, must be disinfected at regular intervals under hygienic production rules. Disinfection is carried out using hot water, alcohol-based disinfectants, surfactants, detergents, oxidizing agents, or a mixture of all these methods. In current applications, liquids are drained manually from preparation units or tanks, and machine surfaces are cleaned manually. Cleaning and sanitation is done by hand. At the same time, performing some cleaning scenarios is harmful to human health because of hot steam or water, chemical cleaning steam, etc. So, it is impossible to ensure the hygiene level of systems. In this study, safe by design and prevention approaches were used and a system equipped with several measurement sensors was designed to work with different sanitary liquids and their preparation units according to sanitary recipes, producing a report at the end of the cleaning process. There are devices such as pH meters, temperature sensors, pressure sensors, and several water analyzers in the system, and it is decided that cleaning is completed by processing the data from these sensors. This article describes the system developed in compliance with industry 4.0 applications

  • Classification of variants of suspended ropeways lines

    pg(s) 302-304

    In the present work, a classification of the suspended ropeways has been made according to purpose and structural composition feature. They are mainly chair and cabin aerial ropeways. The structure of passenger ropeway structures and the standards they must meet are described in more detail. The chemical composition of the ropes, the types of tangles and the standards for their production, maintenance and operation are specified. The classification made gives a multi-criteria optimization, which aims to support the choice in the design of ropeways.

  • Innovative mill complex for processing glass waste, applicable to the production of foam glass and composite materials

    pg(s) 298-301

    An innovative mill complex has been developed for the processing of glass waste applicable to the production of granular foam glass and fire-resistant, energy-saving, acoustic and thermal insulation composite building elements. The presented design solution is in accordance with the necessary technological characteristics of the ground vitreous raw material for use in the production process. It is envisaged that the grinding will be carried out in two stages and will be combined with homogenization of the batch being prepared. The first stage is the initial grinding of the raw material in a vibrating mill with metal grinding bodies, allowing grinding for a shorter period of time to a certain size of the particles with minimal contamination. In the second stage, the final grinding (up to a technological size of the particles) and homogenization is carried out in a ball mill with non-metallic grinding bodies. The main production equipment necessary for the realization of the presented technological process was considered.

  • Energy evaluation of a three-cylinder steam turbine which operates in combined cycle power plant

    pg(s) 294-297

    This paper presents an energy analysis of a three-cylinder steam turbine from a combined cycle power plant. Observing all the cylinders from the analyzed turbine, it is found that the dominant mechanical power producer is Low Pressure Cylinder (LPC), followed by the Intermediate Pressure Cylinder (IPC), while High Pressure Cylinder (HPC) is the cylinder which produces the lowest mechanical power. Whole observed steam turbine develop 119.41 MW of useful mechanical power. Energy loss and energy efficiency of all cylinders are reverse proportional – higher energy efficiency will result with lower energy loss and vice versa. IPC is the cylinder which has the lowest energy loss (equal to 2.59 MW) and the highest energy efficiency of 93.32%. Whole observed steam turbine has energy loss equal to 23.43 MW, while its energy efficiency is equal to 83.60%, what falls in the expected range of such low power steam turbines. Steam mass flow rate through each cylinder is the main element which defines produced mechanical power and energy flows.

  • Example of the maintenance of a machine pero (D 2504-019) for cleaning metal parts in the working conditions of OEM company from the autotive industry

    pg(s) 255-258

    In this article, it will present a example of the maintenance of a machine PERO (D 2504-019) for cleaning metal parts in the working conditions of renowned OEM company in producing filters from automotive industry. The maintenance process is of particular importance in order to use production capacities to the maximum extent. Maintenance is an indispensable segment of any production system. It follows that maintenance should be adapted to these conditions, and be economical and efficient, so as not to slow down the progress of the production system. Various maintenance methods have developed alongside the development of technology, all with the aim of increasing efficiency and reducing costs. This entails the need for increasing knowledge and skills of the workers themselves in the maintenance system. Large sums of money are invested in modern industry, in order to prevent monetary losses caused by system failures. If the machine tools, devices, and accessories are not maintained on time and adequately, there will be a stoppage of production, which is extremely inconvenient for the company. When the machine stops, delivery is delayed, which leads to a psychological effect on the worker, who is then put under pressure to make up for lost time. In this article, the whole procedure of cleaning, mantenance and inspection of machine PERO (D 2504-019) through 13 steps has been studied. The indicators of the reliable operation of the analyzed machine through the analysis of the machine’s operation, the analysis of downtime, and the analysis of the occurrence of failures through the obtained values of MTTR (Mean Time to Repair) and MTBF (Mean Time Between Failures) are presented in details.

  • Design of lng tank Type C

    pg(s) 244-254

    Cylindrical tank-type c is designed for cruise passenger ships trying to adopt hull space and meet the requirements of propulsion. Tank must be a double wall with the vacuum space in between, which is also fulfilled with the perlite as insulation. The main input for the design was a tank capacity of 430 m3, vapor pressure, and available space inside of hull structure. The holding period of the boil-off gas is limited to 21 days of ship voyage. Trying to satisfy the volume capacity of the inner tank different dished end of tank was observed. The inner tank is divided into segments for the calculation of hydrodynamic pressure. According to classification rules, dnv and igc rules tank thickness, supports, stiffening and vacuum rings are determined to satisfy bending and buckling requirements. Some of the requirements were according to british standards for validation of the results. The material that is used for calculation is stainless steel 304 l. The main goal of this paper is to provide the optimal design of the lng tank type c considering the mass of the whole lng tank, with attendance to reduce the steel mass of the structure by optimizing shell thicknesses and the number of vacuum rings. After analytical calculations are made finite element analysis is used for verification of the given results. According to the given results space for improvements of tank-type c was observed.

  • Methods of Identifying Air Leaks in Pneumatically Operated Equipment in the Industry

    pg(s) 207-211

    In recent decades, it has become commonplace to automate assembly operations, often linked to production technologies within a single flexible production and assembly system. Assembly has a significant impact on global production, both in terms of its share of the total production cost of assembled products and in terms of the number of people employed in this area. The challenge for scientific and technical intelligence is to rapidly acquire production and assembly know-how to achieve target parameters in the shortest possible time. The use of all machinery and equipment forces people to think about how to use energy in the most efficient way, with the least possible loss, either in terms of money or in terms of energy. Every year the cost of energy increases, whether due to depletion of supplies or climate changes.
    Compressed air leaks are a serious problem in many industrial and manufacturing environments. These leaks not only increase operating costs but can also have a negative impact on the environment and the health of workers. Compressed air is the most expensive medium and when all basic costs are included, compressed air is many times more expensive than the equivalent of electricity. Therefore, it is necessary to analyse how to prevent high losses in the industry.