Sanchenko Alexey Petrovich

Abstract

  Automation of industrial processes is especially relevant for mining, that feels permanent complication in conditions of production of mineral wealth, which is connected with change to exploitation of beds of smaller power and in deeper horizons.

  The underground coal production is characterized by wide use of coal-plough machines and knife complexes and sets with movable hydroficated props, that helps to exclude application of hand work, as in main so in ancillary operations.

  Today narrow-cut and knife machines are mostly used in coal mines as treating machines for coal extraction. Most of modern coal-plough machines are armed with nonsynchronous electric motors with short-circuited rotor.

  Apparently the main problem for a maximal efficient of the process of mineral wealth production is automation of speed feeding control of the coal-plough machine.

  Gear KD-A fulfills not only speed feeding control but a lot of other functions. In this work the set of the problem is to develop a new block of speed feeding control of the outrigger system of the coal-plough machine in order to raise the automation of the mineral wealth extraction with help of the microcontroller.

  Treating coalfaces are characterized by important diversity of mining and geological conditions of the attitude of bed, suspended material concentration, watering, gas content and uneasiness of working conditions. It requires intensive physical and mental work of a human in conditions that are detrimental for health and dangerous for life.

  Multiply-fiction with a lot of hand work is typical for technological process.

  In machines with outrigger feed drive system for destruction of coal massif is an executive setting with separate motor, that is installed direct in the executive part of the machine that is in a pit-face. Such machines hold much promise, especially if to take into account an existing tendency towards creation of coal-mining complexes, that presuppose work without direct presence of people in treating pit-face.

  The aim of projecting is an increasing of efficiency in regulation of speed of feeding system of treating machine in the process of excavation of coal from treating pit-face be means of fundamental algorithm and structure of apparatus of automation and development on this base a block of regulation of the speed of feeding.

  For achievement of the aim put by it's necessary to solve a row of local problems:

• to develop an algorithm of work of treatment machine and to coordinate it's work with other objects of treatment pit-face;
• to carry out structural identification and to develop mathematical model of the researched object;
• to realize the worked up mathematical model by means of computer engineering;
• to make up researches and to analyze received results;
• to research circuit solutions of the automation system.

  Incomplete automation of electric drives of automated outrigger system of feeding (ROSF) of treating machines is the essential problem. One of two feeding assembly (auxiliary) is armed with a system of hand driving. In a number of works ways of automatically driving of ROSF by main and auxiliary drive are proved. Practical realization of such a driving requires a useful increase of the hard part of the system, which may bring to deterioration of safety of apparatus and increase it's size.

  With the increasing of pit-face lengths and increase in efficiency of treating pit-faces for extension of efficiency of existing systems it is necessary to use the second (tighten) drive in system of feeding.

  In different project researches about ROSF as feeding assembly following operated drives were suggested:

1. Operated hydraulic circuits.
2. Electric drivers based on nonsynchronous motors ruled by frequency reformer.
3. Electric drivers based on direct current motor with ruled thyristor rectifiers.

  Advantages of outrigger hydraulic circuits are easiness in control, high stability of preset speed of driving, disadvantages - low reliability of hydraulic circuit, complexity in production, a necessity of careful servicing in the process of exploitation.

  Electric drivers with frequency reformers and thyristor rectifiers are expensive and complicated in making, have quite big sizes. It is essential to have two frequency reformers or thyristor rectifiers for a separate regulation of electric drivers. They create clutters in charging system in the form of supreme harmonious components of stress, that show negative results in work of the other components in this net. Besides, today there are no protection system from power leakage in the ground, that is obligatory in mining.

  Nowadays there are drivers in production samples of ROSF based on electromagnetic sliding socket (ESS) produced in engineering plant in Gorlovka. In regulating drive current of ESS one can operate the moment and angular velocity of output shaft of feeding assembly and so speed and haulage pull of the machine.

  In that way ESS is comparatively easy drive load-bearing element of the driver. It has small size and weight, has no sliding contacts, that produce arcing, that helps to avoid arcing in work. Drivers with ESS provide the possibility of throttling of drawbar moment and a deep operation in speed of feeding assemble of the machine.

  Now there is ROAF based on ESS based on electromagnetic brake of sliding (ABS), that preserve all the advantages of ESS, principle of driving, but for the account of diminution of the whole length of air-gaps. In preservation of sizes it helps to hand over a bigger drawbar moment in comparison to ESS.

  Earlier as basic technical solution of the problem of the system of automatic driving the apparatus KD-A was taken.

  The most appropriate direction of the perfection of automation is improvement of the system by means of lead-in in the apparatus a new block that provides to fulfill required functions. But there are still development of the automation apparatus viewed on a new base, for a new elementary base, for providing more safety, exactness and better operation. It's advisable to make researched apparatus block based on microcontroller, that will help to set an algorithms of the functioning of the automatic driving system in programming way. The use of the microcontroller in making the automatic drive system will help to diminish the size of the block, to increase it's safety and will help to improve the driving algorithm avoiding big expenses and without changing the structure of the system.

  Today there are a lot of bouquets for modeling a real processes, that helps to appraise analytically and to observe the necessary technological process. Modeling helps to escape unnecessary expenses for creation of research test benches and to receive reliable result.

  The mathematical model was created for parameter determination of dynamical sections, also for definition of necessary parameter of operating current cutoff, load and speed; it will be used for determination of ways to secure of given effort in drawbar parts.

  Parameters, received in researched data will be took into account in projecting of the automatic double-drive outrigger system of feeding assemble of treating machine.

  Later on in master's thesis will be made the algorithmization of the automatic system, elaboration of circuit solution of automatic equipment, namely analyzing of the structural scheme of the automation of the system of the technological process, development of the structural and functional schemes of the automation apparatus. Also there will be elaborated electrical scheme.

  In the nearest future there are development of the software for apparatus and lay-out solutions for automatic apparatus.