1. Brief Introduction
LJB1500C ASPHALT MIXING PLANT is designed and developed by our company, using Japan Niigata NP1500 ASPHALT MIXING PLANT technique. Its main performance can get to congener product, the idea of design consider the situation of a country on china sufficiently, with higher cost performance. It is fit to produce asphalt material of surface and base. The equipment use craftwork of forcible mix, intermittent discharge. Various of sandstone material and powder lot, bitumen can be weighed by electronic scale, controlled by industrial computer, easy operation, reliable performance.
2. Construction Characteristic
1) Hopper adjusts quantity of material by leather belt in control room.
2) Optimization designed Turn—down rig of dryer which has a logical placement is not only to improve efficiency but also to avoid overheat of aggregate.
3) Hot material elevator use loop chain transmission, life is long, convenient maintenance, fine reliability.
4) Screening plant which uses middle four layers circular screen of single axle is high in efficiency, not easily blocked. Vibrancy bearing which has a cooler fan solves middle vibrancy bearing overheat problem. Screening plant reduces influence of noise on complete appliance by second shock absorption. Consequently decreasing influence on measuring system. The body of screen is airproofed in the cover to avoid pollution of dust; the cover is locked by spring device, easily disassembled.
5) Door of Storage bin is single one which is big gap, avoiding block and leakage of material。
6) Door of measuring bin is in compaction and reliable, also avoiding block and leakage of material, shaft sleeve of bin is made of graphite, dry lubrication, no needing lubricant at work.
7) Bitumen is nebulized and injected into the mixer coercively, mixed equality, time is reduced accordingly.
8) Shaft tip of mixer uses chevron seal, avoiding leakage of material.
9) Lining board in the mixer is high intension wear resistant material, after abrasion of blade, it's direction can be changed, then using it newly.
10) Discharge door of mixer is in the form of push and pull, discharge hole is big, time of discharge is short. Dependability is good.
11) Dust collection system is a two grades system, the first is cyclone collection, after collection the filler goes into the hot material elevator and recycled. The second grade is wet collection, which is made up of two water pumps drenching the material. Efficiency of dust collection is improved very strongly. Bag collection is used in the second collection.
12) Complete appliance is controlled by industrial computer, easy to study and understand, precision is high, and Dependability is good. Printer can print working form. Electrical components use oversea and domestic famous brand products. Dependability of hardware is guaranteed.
3. Working process
Asphalt mix material is made up of bitumen, aggregate, powder. The main work of Asphalt mixing plant is to mix the hot aggregate with bitumen, powder after they are measured by electronic scale, producing asphalt mix material which has certain graduation , certain temperature.
Working process as follows:
Loaders load various sandstone material into the cold aggregate hoppers, material is conveyed to the dry device after quantity of various material in each hopper is roughly adjusted. Material is conveyed to vibrating screen upstairs by elevator. By screened, various hot aggregates are screened into hot hopper apart according to graduation, by controlling small gate under hot hopper, material is put into measuring hopper, then the quantity can be confirmed. Measuring which is a control system is made up of electronic sensor, electronic scale, small gate, pneumatic cylinder, solenoid valve, controlling quantity of each material in hoppers by opening and closing gate. After measured, material is put into mix cylinder.
Hot bitumen is conveyed into mixing plant and injected into mix cylinder after measured by bitumen measuring jar.
Filler is elevated to filler storehouse of mixing plant and put into mix cylinder after measured.
Three materials are mixed and changed into final product.
Model and productive capacity
Model LJB1500C
Batch of mix cylinder 1500 Kg
Average moisture content 3%, mix period 45s, output 120t/h.
Asphalt with middle or bigger aggregate.
Average moisture content 5%, mix period 60s, output 90t/h.
Asphalt with smaller aggregate.
Discharge Temperature 140ºC—160ºC
Correlative Condition on Productive Capacity
1)Average moisture content only means moisture content of surface of material, moisture content of interior of material will reduce the productive capacity of dry cylinder.
2)Environmental temperature is 20ºC.
3)Density of material is 1600 Kg/m³.
4)Output includes weight of bitumen and stone powder.
5)Aggregate proportion should be exact, in accordance with criterion of graduation.
6)Density of Stone powder is 1120 Kg/m³.
Main Equipment Technical Parameter, Quantity
1. Cold aggregate supply system
Capacity of hopper: 8 m³ 4 pieces
Width of each hopper: 3000 mm
Height of each hopper: 3620 mm
Adjustable-speed motor: YCT132-4B 4 pieces
Electromotor: 1.5 KW 4 pieces
Electromotor of Motorized head pulley: 3 KW 1 piece
Reductor: 1 piece
2. Belt feed system
Electromotor of Motorized head pulley: 4 KW 1 piece
3. Brake and burning oil supply system
Dryer
Type: acclivitous cylinder and friction wheel drive
Capacity: 120t/h
Spec: Ф1980 mm×8000 mm
Electromotor: 11 KW 4 pieces
Burner
Type High-pressure nebulization
Ability 720 kg/h
Fuel oil pump
Type Gear pump
Ability 1500L/h
Pressure: 0~25 MPa
Electromotor: 1.1 KW
Fuel tank: 20m³
Fan
Type: centrifugate
Ability: 160m³/min
Electromotor: 30 KW 1 piece
4. Dust collector system
The first grade: double cyclone filter, reclaimed material goes into elevator directly
The second grade: wet filter
Ash release: ≤300 mg/ m³
Electromotor of Draught fan: 55 KW 1 piece
Water pump: 15 KW 1 piece
Water pump: 7.5 KW 1 pieces
5. Filler elevator
Electromotor: 3 KW 1 piece
6. Hot elevator
Electromotor: 15 KW 1 piece
7. Screen system
Middle vibrator which has four specs and four floors, bearing cool with fan, two grade damping, airproof between screen and hot bin.
Spec of screen mesh 3x4 7x7 16x16 24x24
We can also supply special mesh size according to customer demand.
Electromotor: 7.5 KW 1 piece
8. Hot bin system
total 4 bins, overflow mouth and scrap mouth, each bin with level-sensing device. Sample mouth is near the discharge mouth.
9. Aggregate measuring device
Sensor 4 pieces
10. Filler measuring device
Sensor 3 pieces
Filler feed electromotor: 0.75 KW 1 piece
11. Bitumen measuring device
Sensor 3 pieces
12. Bitumen spraying system
After measured, bitumen is injected into mixer in form of nebulization.
Electromotor of Bitumen pump: 11 KW 1piece
13. Mixer system
Type: horizontal and double axle, pull and push material gate
Electromotor of reductor: 45 KW 1 piece
14. Pneumatic system
Cylinder 10 pieces
Solenoid valve 10 pieces
Triplex part 2 pieces
Electromotor of Air compressor 1 KW 1 piece
15. Framework system
16. Electric control system
Function:
1) Process of burdening with automatic control
2) Various material mixed together can be modified at any moment
3) Temperature and weight can be displayed
4) Enactment or modify run parameter conveniently
5) Error of burdening is corrected automatically
6) Numerical value of Formulation input is corrected intelligently
7) Current of each main Electromotor can be displayed
8) Manual and automatic switch
9) Process of production can be printed
10) Data memory
Bitumen Supply System
Bitumen capacity: 25m³x2
As best for heat preservation, hot oil heat
Bitumen discharge pool capacity: 6m³ 1 piece
Electromotor of Bitumen convey pump: 11 KW 1 piece
Electromotor of Bitumen feed pump: 11 KW 1 piece
Hot Oil Heating System
Type: automatic and temperature control oil-fired Riello (Italy)
Ability: 600000 kcal /h
Draught fan electromotor: 1.4 kW
Hot oil pump electromotor: 15 kW
Oil injection pump electromotor: 2.2 kW
