Powder Coating Machine for LPG Gas Cylinder Production, LPG Surface Coating Line
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.
3.1 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 |
3.2. 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.
(4)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 |
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.
3.3. 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
5.1. 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 |
| Type of hoister | Reciprocating hoister |
| No of hoister | 1 set |
| No of the torch on the hoister | 2 sets on left, 2 sets on top, 2 sets on bottom |
| Suction capacity of coating chamber | 11000 m3/h |
| Required pressure for compressed air | 6 - 8 bar , + 0.1 bar |
| Remaining water in the compressed air | Max. 1.3 g/N m3 |
| Remaining oil in the compressed air | Max. 0.1 mg/N m3 |
| Estimated air consumption for chamber | 120 N m3/h |
| Power supply | 220/380 VAC, 50Hz, 3L/N/PE, 3 phase 5 wires |
| Estimated power consumption for powder coating | Approx. 10 KVA |
| Estimated power consumption for chamber | 15KVA -- powder coating chamber |
| Requirement for operation condition | Relative humidity<80% Ambient temperature< 30ºC Air speed near the chamber< 0.1 m/sec |
6. Package and Delivery
7.Successful Cases
3kg, 6kg, 12kg LPG cylinder powder coating line in Kenya
12kg LPG cylinder powder coating line in Bangaladesh
8. Our Company
Wuxi Longterm Machinery Technologies Co.,Ltd. is an influential manufacturer of coating equipment,environment-protective plating equipments, green environment-protective powder and other specialized coating production.Our company pays attention to product innovation, with 20 invention patents and 119 utility model patents.
Our products are sold to domestic and international famous enterprises:Cheetah car etc., JinGu\Jinfei car parts, Yueling car parts,Electrolux, Siemens, Philip , Atlas,WAM and domestic long march Launch Vehicle, Haier, Hisense,and exported to Russia, Vietnam, India, Syria , Pakistan, Mexico and more than 20 countries, while is the coating supplier for China Business Aircraft Group in 2009.
Patent And Enterprise Certificate.
Wuxi Longterm coating is national hi-tech company, and has been awarded several honorary title by national and provincial government
9. FAQ
Q: What size of the LPG cylinder your machine can powder coating?
A: 6kg, 12kg,15kgs, and 50kgs LPG cylinder for cooking and another size according to customers' requirements.
Q: About the price
A: The price showing on the website is not the real because of vary item at different prices. The final quotation based on two sides (customer and manufacturer) confirmed the technology project afterward.
Q: Production cycle
A: We are a professional manufacturer of providing the powder coating system. Ensure providing a qualified product and service, we are setting the production cycle is 60 working days. The actually lead time depends on the recent actually production planning.
Q: Service
A: We will offer the whole plant design proposal freely before place order. We are welcome customer visiting the coating line onsite anytime. We will prepare a detailed technology proposal after getting approval between customers and manufacturers.
Enable us to provide the most suitable proposal for you, please tell me the following details:
1.Workpiece size/specification, weight, and process requirements(Powder coating or painting?)
2.Plant foundation drawing, including plant height (the height between factory beam to the ground) and loading&unloading position
3.Heating energy: Electric, LPG, or LNG?
4.The environmental requirements of your local government
5.Voltage
6.Daily and annual capacity.