On developing an automatic control system for the dump conveyor of a wheel excavator

One of the main ways to increase the rotary excavator productivity is to automate excavator operation. The article presents an automatic speed adjustment system for the stacking conveyor belt of a trench rotary excavator. It is shown that the automated control system will allow taking into account the rotor actual rotation speed and the bucket fill factor, processing data and solving tasks of the excavator operation automatic control in excavation mode. The represented automated control system will ensure the conveyor operation with the necessary, but not maximum speed. Therefore, the conveyor will not work “in vain”, that, in its turn, will reduce operating costs including energy.

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DEVELOPMENT OF LABORATORY INSTALLATION FOR RESEARCH OF CHARACTERISTICS OF THE ADVANCED REFRIGERATING SHOWCASE WITH AUTOMATED CONTROL SYSTEM

HERALD of Khmelnytskyi national university ◽

10.31891/2307-5732-2021-295-2-245-253 ◽

2021 ◽

Vol 295 (2) ◽

pp. 245-253

Author(s):

Olha KOROTYCH ◽

◽

Vitalii NEIMAK ◽

Anatolii ZALIZETSKYI ◽

Nataliya ZASHCHEPKINA ◽

...

Keyword(s):

Control System ◽

Automatic Control ◽

Control Systems ◽

Control Unit ◽

Automated Control ◽

Energy Characteristics ◽

Laboratory Installation ◽

Automated Control System ◽

Refrigeration Unit ◽

Operational Temperature

The article describes the stages of development of a laboratory installation for research and analysis of operational temperature and energy characteristics of refrigerated display cases with automated and non-automated control systems for cold set and thawing. The main elements of the developed laboratory installation are: 1) Refrigerating show-window of TATIANA 1.0NS type which components are systems: cooling, control, and thawing. 2) Processor control unit – Eliwell ID controller is equipped with a digital screen, has inputs for two temperature sensors RTS or NTC and three output relays to control the refrigeration compressor, fan and temperature process of the thawing cycle. The processor unit also provides control of the process of throttling the refrigerant in the evaporator to prevent water hammer in the motor-compressor of the refrigeration unit showcase 3) Flexible electric heater built into the evaporator to provide faster heating during automatic thawing. 4) System of forced air cooling of the condenser. The automatic control system with the processor control unit, which is implemented in the laboratory unit instead of the standard thermostat, provides precise temperature control in an extended range of cooling modes and cyclic thawing process. The showcase works in a stable and economical mode. The operating laboratory installation for research of parameters of the improved refrigerating show-window with the automated control system is developed and equipped. The laboratory refrigeration unit is equipped with devices for measuring and controlling electrical and energy parameters, temperature and humidity in the refrigeration chamber of the shop window during the study of cooling and defrosting modes. With an automatic control system in the shop windows, food products can be stored constantly without spending time on overloading them during the thawing of the evaporator. The developed operating laboratory installation can be used in the educational process for research and comparative analysis of operational temperature and energy characteristics of refrigerated display cases with automated and non-automated control systems for cold storage and defrosting.

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Automated control system for fire cutting units on a plate mill

Mathematical machines and systems ◽

10.34121/1028-9763-2021-1-86-95 ◽

2021 ◽

Vol 1 ◽

pp. 86-95

Author(s):

M.G. Ievlev ◽

◽

G.G. Grabovsky ◽

Keyword(s):

Control System ◽

Automatic Control ◽

High Reliability ◽

Metrological Certification ◽

Plate Mill ◽

Metal Consumption ◽

Automated Control ◽

Automated Control System ◽

Plate Rolling ◽

Reliability Characteristics

One of the most important indicators of a plate rolling mill efficiency is a metal consumption (cost coef-ficients) per ton of product. Reduction of metal consumption coefficients is ensured by the accuracy of the set geometric dimensions realization during the rolling, increasing the accuracy of geometric dimen-sions of the plates that are cut from the rolls on fire cutting units, as well as by operating in the minus field of tolerances on the geometric dimensions of the plates. Improving the accuracy of the geometric dimensions of the plates, cut from the rolls on the fire cutting units, is achieved through the automatic control of these units. The article describes the technical solutions, implemented in the automated con-trol system of fire cutting units (the ACS FCU) of the heat treatment department and fire cutting of a plate mill 3600. The purposes of the ACS FCU creation include an increase in accuracy and stabilization of the geometrical sizes of the work pieces cut out of plates through the automatic control; reduction of metal consumption coefficients due to the operation in the minus field of tolerances on the geometric dimensions of the work pieces; replacement of obsolete equipment with the modern one in order to in-crease the reliability of the mill equipment operation; increasing the ACS FCU service life through the use of modern equipment with high reliability characteristics; reduction of unplanned equipment down-time that may arise as a result of the ACS FCU technical means failures. The automated control system of fire cutting units has been set up, tested and put into operation; a metrological certification of the system has been carried out as well. The results of the ACS FCU testing and its subsequent operation have confirmed the system efficiency and the performance of all its intended functions. This system can be also implemented in the processes of treatment of other rolling mills, equipped with the units for the fire cutting of metal.

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