RESEARCH OF INFLUENCING OF PROJECT DISCRIPTIONS OF ELEVATOR ON PARAMETERS OF ITS DRIVE

Dep. «Military Preparation», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipropetrovsk, Ukraine, 49010, tel. +38 (056) 793 19 09, e-mail wbogomas@i.ua, ORCID 0000-0001-5913-2671 Dep. «Applied Mechanics», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipropetrovsk, Ukraine, 49010, tel. +38 (056) 373 15 18, e-mail kazimir.glavatskii@mail.ru, ORCID 0000-0002-3353-2543 Dep. «Applied Mechanics», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipropetrovsk, Ukraine, 49010, tel. +38 (056) 373 15 18, e-mail mazyr-oleg@yandex.ru, ORCID 0000-0002-3704-7799


Introduction
Today it is hard to imagine any industry field without the use of transporting cars. Machines of continuous transport are the basis of complex mechanization of cargo handling and industrial process. They increase the work productivity and production efficiency. The bucket belt elevators are the separate type of continuous transport machines. The elevators are lifts of vertical action and used for vertical and high-angle (angle 60−82 о ) transportation of bulk and manufactured cargo without intermediate loading and unloading. The use of elevators as an intermediate means of transport makes it possible to have a compact transport scheme, which occupies small space. They are used in the chemical, metallurgical, machine-building industry, production of construction materials, coal preparation plants, food plants and in granaries.
The main publications that describe the structure, design features, operational and design values of the elevators are [3,4,5,6,7,9,10]. It is necessary to calculate the reels, the traction unit (tapes), traction calculation and to perform the selection of the main elements of the driving unit for determination the parameters of elevator drive, and in particular its capacity. The order of performing such calculations are described in detail in [6,7]. But, the definite part of time is spent during the attraction of such elevator drive calculation methodology. For the process of elevator drive design improvement, it is desirable to have a scheme which allows simplifying calculations to determine the desired value for the drive power depending on design capacity in a particular type of cargo and the height of its ascent.

Purpose
The aim of this work is building of a parametric dependence of the elevator power drive from its design capacity, which takes into account the type and characteristics of the cargo, lifting height, standard dimensions and parameters of the buckets and tapes.

Methodology
The value of the drive power of the elevator depends on many parameters. The main parameters are: type of cargo, design capacity and lifting height. For further study we will define the basic components of the overall calculation of the elevator which in varying degrees depends on design capacity. These include: linear capacity of buckets (capacity and disposed step of the buckets); width, number of strips and linear weight of tape; the required distributed weight of the load; linear load on the working branch; draft force on the drive drum.
Linear capacity of elevator buckets: where 3,6v α = ρψ -value, that takes into account the properties of the transported cargo, t•m/l•h; ψ -coefficient of bucket charge (according to the physical and mechanical properties of cargo); tdisposed step of buckets, m; ρ -cargo density, t/m3; v -tape speed, m/s. According to the meaning of linear capacity of the elevator bucket that is calculated by the formula (1) the type and disposed step of buckets are selected by the table 1 [7]. The selection of bucket type depends on the material properties that is transported. The deep buckets are used for easily granular, powdered and small parts of cargoes; shallow -for difficult bulk materials.
With the aim of taking into account the subsequent calculations of the physical and mechanical properties of the cargo that is transported, we'll build a correspondent table of the elevator parameters, defined in table 1, the value of performance, expressed by the formula (1) in parts of the coefficient α . The obtained data will be posted in tables 2 and 3 for elevators with deep and shallow buckets accordingly.
Distributed weight per 1 m of the tape is determined by the formula: is the coefficient, which depends on the speed tape, N•s/kg•m. The dependence of the distributed weight of the cargo from the design capacity is calculated by the formula (4) and shown in table 7. Linear weight of tape with buckets is determined by the formula where k m is bucket weight, kg (table 8).
Linear load on working branch is given by: Tentative mass of deep and shallow buckets are shown in table 8 [7].    Table 9 The linear loading on a working branch at deep bucket In addition the tension in the next point ( 1 i + ) is the sum of the tape tension in the point ( i ) and the resistance of the tape movement on the section between these points: In case of a drum drive speed (Fig. 1) by clockwise the minimum tension will be at the point 2 -2 S . Such tension in the tape at normal material scooping satisfies the condition: The strength of the tension at the point 3 consists of a resistance force on the drum and resistance of cargo scooping 2 3 W − : where 1, 08 k = is the coefficient of tension increase in the tape with buckets during the drum rounding .
Resistance of scooping material is determined by the formula where z k is the coefficient of scooping (Nm/kg), which is determined by the specific work, that is expended on scooping of 1 kg material. When the speed of buckets is 1 Thus, substituting the formulas (8) and (10) in (9) we have: The tension forces in the points 1 and 4 are determined by the formulas: where H -height of cargo lifting, m. The dependence of the tension forces values at the point 4, calculated by the formula (13), from the value of design capacity, the type of bucket and the number of strips of tape are summarized in tables 11−12: Table 11 The strength of tension in a point 4 at deep buckets The strength of tension in the tape with The dependence of the values of the tension forces at the point 1 is calculated by the formula (14) the value of design capacity, the type of bucket and the number of strips of tape are summarized in tables 13-14. Traction force with regard to the resistance to rotation of the drive drum is determined by the formula ( )( ) where ' 1,08 k = is the coefficient of resistance to the drive drum rotation.

End of table 18
Design engine power at shallow buckets

Findings
Analyse the impact of the design capacity of the elevator shotblasting room to the power of necessary drive should be conducted. Shotblasting room is used to strengthen the metal springs of car by the method of shot peening. For automation work of such room the elevator is used, that transports the spent shot in feed hopper of shotblasting machine of the rotary type. The steel shot of State standart 3184-95 with diameter of 1,2-1,4 mm is used for the strengthen of the springs. Given the physical and mechanical properties of steel shot (can be attributed to hard-running granular bulk cargo), the tape elevator with disposed buckets and centrifugal unloading was selected. The speed of the tape is 1  Given the standard values of three-phase asynchronous briefly closed motors power of 4A series with synchronous rotation speed of 1000 rpm, table of design capacity and necessary engine power correspondence was built for the elevator drive of shotblasting room. Analyzing the results of calculations presented in table 20, we conclude that the dependence of the power drive of the elevator from its design capacity (at fixed lifting height, type of cargo, the speed of movement of the tape) in general is a piecewise continuous monotonically increasing function that is continuous on the left side at the point of rupture. In this case values effectiveness given in the last column of the table 20 should be considered where the power value changes and equals to the corresponding value given in the second column of the table 20. But to the value 29,31 t/h capacity is equal to 0,75 kW due to the minimality of such power in a number of engines of this class. The graph of the capacity of the elevator drive shotblasting room on the value of design capacity was built according to the results of calculations (Fig. 3).

Originality and Practical value
A parametric dependence of the elevator power drive from its design capacity was built, and it takes into account the type and characteristics of the load, the lifting height, standard dimensions and parameters of the buckets and tapes.
Using the built dependencies enables relatively fast to determine an approximate value of power over the vertical speed elevators with deep and shallow buckets and perform the high-quality selection of its key elements by specific design characteristics: type of load, productivity, lifting height.
On the bases of the proposed approach the impact of the design capacity of the elevator shotblasting room to the required drive was analysed.