Methodical approach to the development of regulations of maintenance and repair of crushing equipment of mining companies

2020 ◽  
pp. 543-556
Author(s):  
A. G. Zhuravlev ◽  
M. A. Chendyrev ◽  
V. A. Cherepanov ◽  
I. A. Glebov
Keyword(s):  
High Performance ◽  
Operating Time ◽  
Operating Conditions ◽  
Repair System ◽  
Maintenance And Repair ◽  
Time Between Failures ◽  
Methodical Approach ◽  
Ore Preparation ◽  
Source Data ◽  
Repair Cycle

Crushing equipment is one of the key for mining enterprises, as it provides ore preparation for subsequent mineral processing. Recently, the issue of increasing the productivity of the crushing site at existing enterprises without radical reconstruction is relevant. The solution is the installation of high performance crushers and the optimization of the maintenance and repair system in order to ensure maximum availability and utilization in time. The article presents the experience of developing a methodology for constructing a strategy for maintenance and repairs (MRO) for crushing equipment. The experience of developing technological routine MRO for crushers manufactured by PJSC Uralmashzavod was taken into account.The problem of the collection, processing of source data and their analysis is considered to obtain reliable statistics on the time between failures of parts and components of crushers.Reflected are the features of the analysis of data on the operating time of assemblies and parts for failure during the service life for various operating conditions.Differentiation of the operating conditions of crushing equipment at mining enterprises is considered, which made it possible to formulate standardized repair cycles for several groups of operating conditions.A technique has been developed to form the structure of repair cycles of crushing equipment.Options for choosing a strategy for building a repair cycle are proposed. The quantity, periodicity and composition of MRO are determined.

scholarly journals TECHNICAL DIRECTIONS OF MAINTENANCE OF WORKING CAPACITY OF ARMOURED VEHICLES OF THE NATIONAL GUARD OF UKRAINE

2021 ◽  
Vol 1 (37) ◽  
pp. 89-95
Author(s):  
I. Shasha ◽  
Keyword(s):  
National Guard ◽  
Road Transport ◽  
Operating Conditions ◽  
Repair System ◽  
System State ◽  
Working Capacity ◽  
Territorial Defence ◽  
Maintenance And Repair ◽  
Special Operations ◽  
Design And Manufacture

Maintenance of armoured vehicles in modern conditions has a significant impact on the effectiveness of combat missions. In particular, the timeliness of delivery of personnel and necessary cargo can be a critical parameter for the success of tasks in emergencies of man-made and natural origin, riots, participation in special operations for searching for and neutralizing armed criminals, eliminating illegal armed groups or performing territorial defence tasks. A complex characteristic of any technical system is its efficiency as a measure of the feasibility of solutions adapted to operating conditions. Assessing the effectiveness of armoured vehicles is associated with the need to predict performance, which directly depends on the application of modern technical areas to maintain the required level of performance. The efficiency of the system - the ability to perform its functions with a certain level of quality during the established period of operation. The efficiency of the system is determined by the set of its properties, laid down in the design and manufacture and maintained during operation. In this work, the criterion of effectiveness is to maintain the efficiency of armoured vehicles at the required level in service and combat use in a variety of road, transport and atmospheric-climatic operating conditions. Strategies and tactics for maintaining armoured vehicles performance at the required level are considered. The specificity of the operation of armoured vehicles is that it is used in different, sometimes very difficult conditions. Therefore, an individual approach is required, an adaptive maintenance and repair system state of armoured vehicles. The most expedient for armoured vehicles is a balanced combination of all levels of regulation of the systems of organization of maintenance and repair.

scholarly journals Monitoring the Technical Condition of AC Electric Locomotives using Traction Energy Consumption Rates

2021 ◽  
Vol 18 (5) ◽  
pp. 62-89
Author(s):  
A. P. Semenov ◽  
V. V. Semchenko ◽  
I. Yu. Khromov
Keyword(s):  
Technology Implementation ◽  
Reactive Power ◽  
Electricity Consumption ◽  
Technical Condition ◽  
Operating Conditions ◽  
Repair System ◽  
Dynamic Data ◽  
Maintenance And Repair ◽  
Institute Of Technology ◽  
General Director

Currently, the methods of monitoring the technical condition of locomotives using data of on-board microprocessor-based control systems are widely used. This monitoring of Russia has become an operating technology of the locomotive maintenance and repair system.The main problem of monitoring is the limited set of sensors in locomotive circuits. Increased number of sensors leads to a decrease in reliability and to an increase in the cost of a locomotive and of its life cycle, while allowing to achieve better quality of diagnostic information.Besides, it is advisable to have integrated indicators of the technical condition of a locomotive. The article presents a computer software product for analysing the technical condition of a locomotive based on dynamic data on consumption of traction active power and generation of reactive power. The software was developed by using algorithmic language Visual BASIC for Applications, embedded in MS Excel, using probabilistic and statistical methods of analysis.The method for diagnosing the technical condition of a locomotive within the monitoring system is based on a comparison of dynamics of consumption of active and generation of reactive power by two sections of the same locomotive according to the principle of functional benchmarking. For monitoring the technical condition of locomotives, the term «pre-failure» is suggested, which is defined as the operable condition of a locomotive while there are internal hidden defects or damage. Pre-failure manifests itself in power consumption. To analyse the technical condition of AC electric locomotives in terms of electricity consumption, the initial data must have a high degree of unimodality, which is determined by uniformity of operating conditions.The resulting data obtained following the analysis of the technical condition of a locomotive based on the dynamic data on consumption of tractive active energy and generation of reactive power can be used to determine a defect that causes a change in consumption of electricity at the moment when the locomotive enters technical maintenance and repair depot. *Information about the authors: Semenov, Alexander P. – Ph.D. (Eng), General Director of JSC Research Institute of Technology, Control and Diagnostics of Railway Transport, Omsk, Russia, [email protected]. Semchenko, Victor V. – Ph.D. (Eng), General Director of JSC Railroad Centre of Technology Implementation of Krasnoyarsk Railway, Krasnoyarsk, Russia, [email protected]. Khromov, Igor Yu. – Business Analyst of LLC2050-Integrator, Moscow, Russia, [email protected]. Article received 13.05.2020, accepted 23.10.2020. For the original Russian text of the article please see p. 62. 

Tool Materials for Turning Machine-Building Stainless Steel 09Kh17N7Yu

2021 ◽  
pp. 27-33
Author(s):  
B.Y. Mokritskiy ◽  
E.S. Sitamov
Keyword(s):  
Stainless Steel ◽  
Tool Wear ◽  
High Performance ◽  
Metal Cutting ◽  
Operating Time ◽  
Tool Material ◽  
Machine Building ◽  
Operating Conditions ◽  
Software Environment ◽  
Tool Materials

Hard-to-process specialized stainless steel grade 09Kh17N7Yu has become widely used in various fields of mechanical engineering due to its unique performance properties. The existing recommendations for its processing are outdated and do not meet modern requirements for the performance of metal-cutting tools. This necessitated the need to develop recommendations for modern high-performance machine tools. The paper presents methods of solving this problem based on the example of turning by typical domestic replaceable hard-alloyed cutting plates. Relationships between the tool wear and the operating time were obtained. Design solutions for tool materials to be used under specified operating conditions were developed. A significant outcome of the paper was the use of simulation modeling in the Deform software environment, which allowed the authors to develop new coatings for the hard alloy VK8, which provided a significant (up to 3 times) increase in tool life. Using modelling, it was also possible to design new tool materials for new or expected operating conditions. The following main criteria sufficient for modeling were identified: tool wear, temperature in the cutting zone, stresses in the tool material and deformation of the tool material. The results obtained can be used as the basis for the so-called data bank, which can be used in production enterprises.

THE FACTORS AFFECTING THE WEAR OF THE MAIN MECHANISMS AND SYSTEMS OF THE NTERNAL COMBUSTION ENGINE

2021 ◽  
Vol 1 (142) ◽  
pp. 12-23
Author(s):  
Grigoriy A. Iovlev ◽  
◽  
Irina I. Goldina
Keyword(s):  
Internal Combustion Engines ◽  
High Reliability ◽  
Unit Cost ◽  
Operating Time ◽  
Operating Conditions ◽  
Research Purpose ◽  
Agricultural Machinery ◽  
Optimal Frequency ◽  
Maintenance And Repair ◽  
Acceptable Method

In the course of operation of transport and technological machines (tractors, cars, grain and forage harvesters and other complex agricultural machinery), the joints in the nodes, aggregates, and mechanisms are worn out. The amount of wear depends on the service life and operating conditions. (Research purpose) The research purpose is in searching for the most acceptable method for practical application of determining the optimal frequency of technical service to ensure high reliability and efficiency through reducing the intensity of wear of the interfaces of components, aggregates, mechanisms of the transport and technological machine; proposing coefficients for adjusting the frequency standards when planning and organizing maintenance and repair of agricultural machinery. (Materials and methods) The condition of the crankshafts of internal combustion engines at the operating time close to carrying out major repairs, 5000 hours (maintenance - 3) for tractors, 192,000 km and 150,000 km (routine repairs) for vehicles like KAMAZ and GAZ-3309. Authors applied the methods used to determine the optimal frequency of maintenance and repair, which characterize the quality of technical impacts. (Results and discussion) The article presents calculations performed to determine the maximum performance of the unit as part of a tractor with different maintenance intervals and an agricultural machine based on the use of a statistical method (according to the probability of failure). Authors found that the most acceptable method for determining the optimal frequency of technical impacts is the "unit cost" method. The article proposes coefficients for adjusting the frequency of technical impacts. (Conclusions) Determining the optimal frequency of technical impacts will minimize operating costs and prevent possible failures. To do this, it is necessary to choose an acceptable method that determines the optimal frequency and ensures minimal wear of the interfaces in the nodes, aggregates, mechanisms of transport and technological machines.

scholarly journals Organization of operation, repair and maintenance of locomotives in the railroad operating domain

2019 ◽  
Vol 135 ◽  
pp. 02008
Author(s):  
Aleksander Pavlyukov ◽  
Alexander Buynosov ◽  
Aleksander Mironov ◽  
Sergey Laptev
Keyword(s):  
Service Providers ◽  
Technical Condition ◽  
Repair System ◽  
Cycle Structure ◽  
Maintenance And Repair ◽  
Repair Costs ◽  
Limited Life ◽  
Software Product ◽  
Equipment Failures ◽  
Repair Cycle

The methods that are widely used today to determine the required locomotive fleet, the Corresponding maintenance and repair system consider the locomotive as a whole, without taking into account the technical condition of its individual units, which have a limited life cycle. Furthermore, the methods used today do not take into account the time spent on relocation from an operational locomotive depot to a service depot and back. The purpose of this study is to develop the methods for determining the number of locomotives based on the anticipated workloads for specific operational sections, the necessary accompanying maintenance and repair, the optimized repair cycle structure with due account of the available resources of the limiting units in the railroad operating domain which are capable of taking into account the technical condition of equipment (failures, repair costs, and time spent on relocation from one depot to another). A model for organization of repair of gas turbine locomotives assigned to operational locomotive depots while undergoing repair in service locomotive depots is proposed. Using this model, it is possible to develop a software product for distributing routine locomotive repairs among service providers, thus optimizing the workload of the latter.

Viability of turbine blade material with a long service life

2019 ◽  
pp. 28-35
Author(s):  
O. B. Berdnik ◽  
I. N. Tsareva ◽  
M. K. Chegurov
Keyword(s):  
Heat Treatment ◽  
Service Life ◽  
Yield Strength ◽  
Mechanical Characteristics ◽  
Operating Time ◽  
Structural Features ◽  
Operating Conditions ◽  
Standard Methods ◽  
Experimental Values ◽  
Plasticity Coefficient

This article deals with structural features and characteristic changes that affect the mechanical characteristics after different service life in real conditions using the example of the blades of the 4th stage of turbine GTE-45-3 with an operating time of 13,000 to 100,000 hours. To study the change in the state of the material under different operating conditions, determine the degree of influence of heat treatment on the regeneration of the microstructure, and restore the mechanical characteristics of the alloy after different periods of operation, non-standard methods were used: relaxation tests on miniature samples to determine the physical yield strength and microplasticity limit and quantitative evaluation of the plasticity coefficient of the material from experimental values of hardness, which allow us to identify the changes occurring in the microvolumes of the material and predict the performance of the product as a whole.

scholarly journals Evaporator Optimization of Refrigerator Systems Using Quality Analysis

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 555
Author(s):  
Sangkyung Na ◽  
Sanghun Song ◽  
Seunghyuk Lee ◽  
Jehwan Lee ◽  
Hyun Kim ◽  
...  
Keyword(s):  
Power Consumption ◽  
Operating Time ◽  
Cooling Capacity ◽  
Operating Conditions ◽  
Quality Analysis ◽  
Lubricating Oil ◽  
Optimal Operating ◽  
Compressor Piston ◽  
Refrigerator Temperature ◽  
Visualization Experiments

In this study, evaporator optimization, via both experimental and simulation methods was conducted. To evaluate the evaporator performance, under the optimal system, the compressor operating time and the effects of oil on the refrigerator system were studied. If the temperature of the refrigerator chamber reaches the setting value, the compressor stops working and it leads to the temperature of the refrigerator chamber slowly increasing, due to the heat transfer to the ambient. When the refrigerator temperature is out of the setting range, the compressor works again, and the refrigerator repeats this process until the end of its life. These on/off period can be controlled through the compressor piston movement. To determine the optimal compressor operating conditions, experiments of monthly power consumption were conducted under various compressor working times and the lowest power consumption conditions was determined when the compressor worked continuously. Lubricating oil, the refrigerator system, using oil, also influenced the system performance. To evaluate the effect of oil, oil eliminated and oil systems were compared based on cooling capacity and power consumption. The cooling capacity of the oil eliminated system was 2.6% higher and the power consumption was 3.6% lower than that of the oil system. After determining the optimal operating conditions of the refrigerator system, visualization experiments and simulations were conducted to decide the optimal evaporator and the conventional evaporator size can be reduced by approximately 2.9%.

scholarly journals Impact of Operating Time on Selected Tribological Properties of the Friction Material in the Brake Pads of Passenger Cars

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 884
Author(s):  
Andrzej Borawski
Keyword(s):  
Tribological Properties ◽  
Operating Time ◽  
Friction Material ◽  
Operating Conditions ◽  
Direct Impact ◽  
Passenger Cars ◽  
Wear Factor ◽  
Brake Pads ◽  
Road Users ◽  
The Coefficient Of Friction

Braking systems have a direct impact on the safety of road users. That is why it is crucial that the performance of brakes be dependable and faultless. Unfortunately, the operating conditions of brakes during their operating time are affected by many variables, which results in changes in their tribological properties. This article presents an attempt to develop a methodology for studying how the operating time affects the value of the coefficient of friction and the abrasive wear factor. The Taguchi method of process optimization was used to plan the experiment, which was based on tests using the ball-cratering method. The results clearly show that the degree of wear affects the properties of the friction material used in the production process of brakes.

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