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The technological process of production of the asphalt mix.

Characteristics of the asphalt mixing unit DS-185, used in producing the asphalt mix in «Construction of the road NPS - 2»

Asphalt mixing unit is designed to prepare asphalt concrete mixtures used in road and other types of construction, quality, composition and materials used meet the requirements of State Standard 9128-84.

The unit provides a rapid change in the recipe and can perform such operations of technological process:

- pre-dosing of stone materials in the supply unit and it's delivery to the drying unit;

- drying and heating of the stone material to the operating temperature in the drying unit and supply of heated material to the vibrating screen of the mixing unit;

- sorting of heated stone materials in the four fractions, temporary storage of it in bunker of hot stone materials, dosing and delivery of them to the mixer;

- cleaning of exhaust gases in the preliminary stages of cleaning, high-performance cyclone and venturi scrubber;

- use of collected dust by applying it to the bay of sand bunkers of hot stone materials;

- receiving, storage, heating up to operating temperature of bitumen dosing and delivery of it into the mixer; - прием минерального порошка, временное хранение, дозирование и выдачу его в смеситель;

- mixing of the components of asphalt concrete mixtures, the load of ready mix to vehicles or delivery of it with skiphoist to the unit of ready mix, and then in the vehicle.

The unit is provided:

- automatic dosing of stone materials, bitumen, mineral powder, mixing of it and delivery of ready mix into the unit;

- re-use of water (water recycling) for venturi scrubber;

- remote control of all major mechanisms;

- oil heating of bituminous communications.

Control of the entire unit is centralized and managed with microprocessor control system. Bitumen heater has its own self-control panel.

Unit is made in climatic version U has category 1 State Standard 15150-69 for operation at an ambient temperature of 273 (0 ⁰С) to 313 (40 ⁰С).

Main technical data:

Name of parameter

The value (nominal)

General information

Rated Capacity, t / h

  - At a moisture content of raw materials

    (sand and gravel)

to5% u * t=180 ⁰C 42  ± 10%

to 5% u * t=140 ⁰C 48  ± 10%

- At a moisture content of raw materials

    (sand and gravel)

to 3% и t=140 ⁰С and preparation of

a coarse mixture 56  ± 10%

+10%

Voltage three-phase alternating current, V 380

-5%

Frequency, Hz 50  ± 1%

Maximum temperature:

K(⁰С)

- of bitumen 453(180)

- of sand and gravel 458(185)

Mobility Stationary

Way to download a ready mix Gravitational, from the

in trucks aggregate's bunker of ready mixture

Method of dust disposal Use in the technological process

Method of heating the bitumen With fire

Type of dosing Weighting: for stone materials, mineral powder, bitumen

Type of mixer Of periodic action

The layout of mixing unit

equipment   Tower

The number of supply aggregate's

bunkers, units. 4

The total capacity of supply aggregate's

bunkers, m³, not less than   32

Type of aggregate's power feeders Volumetric conveyor

The number of fractions of dosing material, pieces. 4

Hopper capacity for hot

materials, m³, not less than 8,3

Aggregate’s bunker capacity of ready mix,

m ³ (ton) (at specific volumetric weight

of a mixture of 1.8 ton / m ³), at least 39 (70)

Maximum weight of batch, kg, not more 730

Aggregate's bunker capacity

of mineral powder, m, at least 23

Bitumen tank capacity,

m ³, at least 30

Type of dust collectors Combined: dry (cyclones),

wet (venturi scrubber)

Type of fuel Mazut oil 100

State Standard 10585-75, or

diesel fuel "A"

State Standard 305-92

Type of control of the unit Automatic and remote on the basis of the relay contact management system

Installed power, kW

not more 215

including:

electric motors 166

electric heaters 49

Structural weight, ton, not more 72

Overall dimensions, m, not more:

length 46,3

width 29,45

height 17,61

**

Specific weight, t.ch / t, no more 1,5

**

Specific power consumption,

  kW h / t, no more 3,58

**

Specific consumption of fuel,

  kg / t, no more 13

**

Specific power, kW h / t,

  not more 4,48

Safety and protection of the atmosphere

The sound level and the equivalent sound

level at the operator cabine, dBA

not more 75

The sound pressure level at the operator

cabine, dB in octave bands with

geometric mean frequencies

  Hz, no more

31,5 103

63 91

125 83

250 77

500 73

1000 70

2000 68

4000 66

8000 64

The sound level and the equivalent sound

level in the work area of operator assistant

(State Standard 12.1.003-83), dB,

not more 80

The sound pressure level in the work area

of operator assistant, dB in octave bands with

geometric mean frequencies

  Hz, no more

31,5 107

63 95

125 87

250 82

500 78

1000 75

2000 73

4000 71

8000 69

The level of impact on the operator of

vibroacceleration, not more than (m ·s ^-2) dB

in the direction of Xo, Yo with a geometric

mean frequency bands, State Standard

12.1.012-90, Hz:

2,0 (0,14) 103

4,0 (0,10) 100

8,0 (0,11) 101

16,0 (0,20) 106

31,5 (0,40) 112

63,0 (0,80) 118

The level of impact on the operator

of vibration speed, not more than (m ·s ·10 ^-2) dB

in the direction of Xo, Yo mean frequencies

for the bands, State Standard

12.1.012-90, Hz:

2,0 (1,30) 108

4,0 (0,45) 99

8,0 (0,22) 93

16,0 (0,20) 92

31,5 (0,20) 92

63,0 (0,20) 92

Level of concentration of harmful substances

at the operator's cabine and in the working

zone of the assistant of operator

(State Standard 12.1.005-88) mg / m 3, not more:

- if it contain SiO2

from 10% to 70% 2

from 2% to 10% 4

- sulfur dioxide (SO₂) 10

- nitrogen oxides (NOx) in recalculation

to NO2 5

***- carbon monoxide (CO) 20

-hydrocarbons limiting (SpNh)

in recalculation on C 300

Illumination at the operator's cabine

  for general illumination, lux, at least 150

The illumination in the working area

of the operator's assistant, lux, at least 50

Acceptable standards of temperature,

relative humidity and air velocity at the

operator's cabine (State Standard 12.1.005-88):

- in the warm season (outdoor air

temperature above +10 0C):

a) air temperature, 0 C 21 - 28

     b) relative humidity,%

       no more than

55 (at 28 ⁰С)

60 (at 27 ⁰С)

65 (at 26 ⁰С)

70 (at 25 ⁰С)

75 (at 24 ⁰С и ниже)

c) the air velocity, m / s

       within 0,1 - 0,3

- in the cold season (outdoor air

temperature 10 ⁰ C and below):

a) air temperature, ⁰С 20 - 24

b) relative humidity, %, no more than 75

c) air velocity, m / s,

not more 0,2