Model NO.: hlt
Workpiece Weight: 35kg
Heating Source: Nature Gas or LPG Gas
Trademark: Longterm
Transport Package: Standard Seaworthy Package
Specification: ISO9001
Origin: China
HS Code: 85158000
Model NO.: hlt
Workpiece Weight: 35kg
Heating Source: Nature Gas or LPG Gas
Trademark: Longterm
Transport Package: Standard Seaworthy Package
Specification: ISO9001
Origin: China
HS Code: 85158000
1. Powder coating line design
No Name Details
1 Workpiece Gas cylinder
2 Workpiece material Metal
3 Max. workpiece size Φ300×H570(mm)
4 Workpiece weight ≤30kg
5 Braced chain QXT250/50Kg light common chain
6 Machine capacity 2000pcs/12hours
7 Hanging type One cylinder every two pitch, that means one cylinder per 500mm.
8 Linear speed 2000pcs÷12h÷60min×0.5m/hang=1.4m/min
9 Heating source Nature gas(LPG)
10 Location area See layout drawing, beam bottom height 8.5 meters
 
2. Process flow diagram
This line consists of powder coating chamber, booth, curing bake, suspend conveyor and electric control system.
No Name Transit time Working temperature Operation
1 Loading   RT Manual
2 Powder coating   RT Auto+manual
3 baking 17-18min 180-190ºC Heated air circle
4 cooling 20min    
5 unloading     Manual
 
3. Curing bake
 
The drying tunnel consists of three parts: drying tunnel. Heating system and exhaust system.
  1. Drying tunnel
 
No Name Technical parameter
1 Overall structure Bridge type
2 No of tunnels 4
3 Size of the inner tunnel L14×W3.2×H2.1(m). Leg height 2.5meters
4 Thickness of the insulation 150mm
5 Material of the insulation High quality rock wool board
6 Unit weight of the insulation 100Kg/m3
7 Material of the inner plate δ0.8 galvanized steel sheet
8 Metarial of the outer plate δ0.8 color sheet
9 Structure of inner and outer plate Assembly structure
10 Material of the inner angle plate δ1 galvanized steel sheet
11 Material of the outer angle plate δ3 hot-rolled sheet with paint
12 Supporter material of the tunnel δ3 carbon steel sheet, edgefold with paint
13 Outer temperature of the tunnel Lower than environment temperature 15ºC
14 Inner temperature of the tunnel 180ºC
15 Drain cracking-off Top of the tunnel
 
2.heating system: consists of heating chamber, burner, heated air recycling fan, return airway and temperature control system.
(1)heating room: an access door is on the side of the heating chamber for future repairing.
No Name Technical parameter
1 Position and number of heating room Bottom of the bake tunnel, 1 set
2 Heating room configuration 300000 calories, 1 set
3 Inner plate of the heating room Galvanized steel, δ1
4 Outer plate of the heating room Cold-roll steel sheet, δ1.5
5 Thickness of the insulation 150mm
6 Material of the insulation High quality rock wool board
7 Unit weight of the insulation 100Kg/m3
8 Material of the inner angle plate δ1 galvanized steel sheet
9 Material of the outer angle plate δ3 hot-rolled sheet with paint
10 Supporter material of the tunnel δ3 carbon steel sheet, edgefold with paint
11 Structure of inner and outer plate Assembly structure
 
(2) burner
1 set, 300000 calories
Gas consumption: 10-15m3/h
Brand: Italian Riello RS34
 
(3)burning tank
Heat exchanger is used to transfer the heat to heating room, then hot-air blower will bring the heat to the tunnel. Adopts direct-fired heating, the burning tank is stainless steel with high temperature filter.
 
  1. Thermal cycling fan: adopts special air-cooled centrifugal fan
 
No Name Parameter
1 Model GCF-630C
2 Rotation speed 1250r/min
3 Air flow volume 13500m3/h
4 Total pressure 900Pα
5 Motor power 5.5KW
6 Fan structure Impeller is in the heating room
7 Insulation thickness 150mm
9 Impeller material 16Mn
10 No. Of fans 1 set
11 Fans supplier Shanghai Shuyuan or Kewangda
 
(5) Air delivery & returning duct
 
No Name Parameter
1 Hot air recycling Internal recycle, no outer tubes
2 Air delivery type Under floor air delivery
3 Air returning type Under floor air returning
4 Duct material Galvanized steelδ1
5 No of air regulation plate 1 set
6 Material of air regulation plate Galvanized steelδ1
(6) Temperature control system
Drying tunnel uses digital temperature controller to adjust the temperature automatically, it can display and control the drying tunnel temperature in real-time.
The temperature measurement uses platinum resistor temperature sensor.
The drying tunnel temperature can be adjusted continuously from normal temperature to 200°C.
 
3. Exhaust pipe
The entrance/exit of the drying tunnel on the top equips with exhaust pipe and  butterfly valve, it is used for draining the exhaust gas of the drying tunnel.
The material of the exhaust pipe is δ1mm galvanized sheet.
 
4. Hang type conveyor
Hang type conveyor consist of driving device, tension device, variable-frequency governor, chain, straight conveyor, bend conveyor, temperature flexible conveyor, inspection conveyor and lubrication system etc.
Variable -frequency governor uses Mitsubishi. The speed is 1.4 m/min.
The lubrication system uses automatic oil drop device.
Hang type conveyor equips with 1 set driving device, 1 set weight-loaded type tension device, using frequency to adjust speed.
 
 
 
No Name Technical specification
1 Driving device model QXT-250
2 Driving device quantity 1 set
3 Overload protection for driving device Adjustable safety clutch+travel switch
4 Driving device power 3.0KW
5 Tension device type Weight-loaded type
6 Tension device quantity 1set
7 Turning radius of tension device ≥R800(mm)
8 Frequency converter Mitsubishi 1 set
9 Conveyor chain length 125m
10 Conveyor chain pitch 250mm
11 Hoisting weight of conveyor chain single point 50Kg
12 Production speed 1.4m/min
13 Production speed adjustable method Frequency control(0.6-2.0m/min)
14 Column quantity,material Complete set, steel section
15 Bottom plate quantity,material Complete set, hot-rolled sheet steel
16 Beam quantity,material Complete set, steel section
17 Diagonal bracing quantity,material Complete set, steel section
18 lubrication system Automatic oil drop device 1 set
19 "C" type jig and rotary rack 250 pcs
20 Rotary rack 1set
 
5. Powder coating system
Using color-changed single grade filter core recycling powder room.
1. Technical parameter
 
Machine type Manual
 
Max. Hang range of the workpiece
 		 W310xH570
Conveyor speed
 		 About 1.4m/min
 
  Type of conveyor
 		 Suspend conveyor
  Coating material
 		 Polyester powder and epoxy powder
 
  Color 2 kinds
 
  Powder supplier
 		 Local
  Type of coating chamber
 		 Filter type powder coating chamber
  Type of powder coating systems
 		 Corona torch
  No of powder coating systems
 		 6 sets auto, 1 set manual spraying torch

October 21, 2018
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