Nitrogen Atmosphere Nocolok Continuous Brazing Furnace for Aluminum Car Radiator

Product Description

I. Description of equipment: Continuous Nitrogen shielded Nocolok aluminum radiator brazing furnace
II. Application of aluminum radiator brazing furnace: 
This line is designed for brazing aluminum heat exchanger cores by using non-corrosive flux (Nocolok Flux) under Nitrogen gas shield protection.
Our design is advanced, state-of-the-act, mature, wear well, environmentally-friendly.
Production flow: loading workpiece → flux spraying → drying → going through front curtain room (with nitrogen) → brazing (with nitrogen) → slag removing (nitrogen pre-heating) → going through static cooling room → going through rear curtain room (with nitrogen) → going through compulsive air cooling room → manual taking off cores from belt.

III. Composition of alumium radiator brazing furnace
The complete system mainly includes four sections: round-design flux spraying room, drying oven, brazing oven and control system.
- Degreasing or cleaning section (optional)
- Continuous flux spraying section (including flux mixing & feeding)
- Drying oven and its driving unit
- Front-curtain room of brazing section
- Brazing section & its driving unit
- Slag-removal room
- Static cooling room
- Rear-curtain room of brazing section
- Compulsive cooling room
- Electric control system
- Water & nitrogen supplying device

IV Main feature description:
4.1 Flux spraying section
- Whole body is made from stainless steel 304 and designed in reinforced structure, assuring long-life faultless serving.
- System can spray fluxes to core section and header plates accurately.
- Spraying nozzle is easily demountable.
- Round-cylinder design assures non-piling-up during fluxes collecting.
- A manual spraying section is added on exit of this spraying room, for partial increasing flux.
- Height of high-pressure fan blade is adjustable for better removing excess flux.
- One unit filter is provided in flux recycling system to avoid foreign objects damaging spraying pump.
4.2 Drying oven
- U-shape stainless steel tubular heating elements are mounted on both sidewalls of the oven, better radiating result.
- Internal surface and wind scooper are made from SS304, 1.5mm thick
- Transmitting belt is made from SS304, inverter control
- A cleaning & overhauling entrance is provided on the body.
4.3 Brazing oven
- Full oven is insulated by high-performance fiberglass wool, good thermal insulation. Temperature rising time (from ambient to 630°C) is only 2.5 hours. Heating consumption during brazing is less than 60% of installed power.
- Muff body is made from SS 304 and 316L, one 10m long plate folded, only two welding seams, very small deformation because of welding stress, very small deformation during working.
- Four sectional temperature control, high control precision (±1ºC); Temperature evenness in same section is within ±3ºC.
- Slag-removing room is equipped with separate Nitrogen pre-heating system which can heat nitrogen gas to 300ºC.
4.4 Temperature control system
- PID control by SHIMADEN original from Japan

V Technical data of aluminum radiator brazing fruance

Item	Data
Belt center height	850mm
Effective belt width	800mm
Effective working height	200mm (above belt)
Belt speed	300~1000mm/min (inverter control adjustable)
Drying oven effective size	7000 x 850 x 200mm (L x W x H)
Brazing oven effective size	10000 x 850 x 200mm (L x W x H)
Total length	39.2m
Total heating power	410kW (drying 120kW + brazing 320kW)
Pure nitrogen gas supplying	200m^3/h (real consumption 80~100m^3/h)
Applicable aluminum radiator core	Max. Width 700mm, length no limited
Production speed	60~90 pieces/hour, typical 550 x 700mm cores

VI Technical specifications of aluminum radiator brazing furance

6.1 Flux spraying device (round cylinder shape)

A) Function

- Even coating fluxes, no missing area
- Excess fluxes can be flowed away
- Equipped with manual coating area
- Equipped with fluxes recycling system
- Round-cylinder design for better recycling, less residual, good for wind circulating inside
B) Main data

Item	Data
Belt center height	850mm
Effective belt width	850mm
Effective vertical height above belt	200mm
Transmitting chain	SUS304, horseshoe chain
Length of spraying room	700mm
Length of blowing room	800mm
Length of front entrance	1500mm
Length of manual spraying area	1500mm

C) Components:
C1- Flux spraying device
 - Stainless steel body & frame; both sides with observing window, good seal; soft PVC curtain.
 - Pneumatic diaphragm pump from Taiwan PUMPSMITH, two pieces, one for spraying, one for recycling
 - Fan-shaped nozzles, quick detachable type, 9 pieces
 - Belt transmitting speed is inverter control, adjustable for different products
C2- Air blowing device
 - Mounted 15° on top of cores
 - Air flow: 40m/s, 550m3/h, 430mbar, blowing mouth width 1mm
 - Height above cores: 50~150mm, adjustable
 - Fan motor power: 7.5kW
C3- Flux tanks, two sets
 - SUS 304, Φ900 x 600mm height
 - Filter mesh is equipped for recycling
 - Tank is equipped with wheels, movable
6.2 Drying oven

1) Main data 

Item	Data
Belt center height	850mm
Normal working temperature	200~250ºC
Max. Heating temperature	350ºC
Oven temperature evenness	±5ºC
Oven channel size	850 x 250mm (effective 800x200mm)
Temperature control area	Two (front 70kW, rear 50kW)
Temperature control method	PID
Heating element	U-shape stainless steel tubular heater
Transmitting belt	SUS304 wires, Φ3mm + Φ 3.5mm
Total length	10.5m (transmitting 1.8m + drying 7.7m + passive 1m)

2) Oven structure
-External surface and internal surface are steel plate welded structure
- Each section has overhauling & slag-removing hole

- Insulation material is aluminum silicate, completely filled between external and internal surface, solid structure.
- One vortex blowing fun is mounted on top of oven, driving by 3kW SIEMENS motor; Wind speed on the surface of belt is not less than 4m/s.
- Fan blades, axle and cover are all stainless steel.
- Fan is designed in maintenance-convenient structure, convenient for adding grease and changing bearing.
- ON/OFF of fan is interlocked with heating. Only fan is ON and heating elements become dry, heating can be started, thus ensuring long life of heating elements.
- One exhausting fan is equipped for exhausting moisture inside the oven.
- Oven external surface temperature rise is not more than ambient + 20ºC
3) Driving device
- Stainless steel transmitting belt
- Delta inverter for speed control
- Belt speed can be preset on HMI
6.3 Front-curtain Room

Item	Data
Total length	1500mm
Curtain material	0.05mm SS316L foil + 0.18mm fabric
Nitrogen inlet	one
Door damper max. Open height	200mm
Damper elevating	manual
Room insulation thickness	50mm

6.4 Brazing oven section
A) Main data

Item	Data
Total length	10m
Effective size	800mm (belt width) x 200mm (height above belt)
Max. temperature	700ºC
Working temperature	600~650ºC
Temperature evenness	±3ºC
Temperature control	5 sections, 10 zones, PID
Designing power	320kW
Heating method	Electric heating wire (0Cr25Al5)
Transmitting belt	SUS316L wire, Φ3mm + Φ 3.5mm
Max. allowable oxygen content	50PPM

B)Structure
- External surface: steel plate welded structure
- All walls are insulated by ceramic fiber pinprick flat, external surface temperature rise is not more than ambient temperature + 20ºC.
- Heating elements: mounted outside of muff hearth, easy changeable
- Muff hearth: SUS 316L 8mm whole-length folded into two parts and then welded by TIG first and arc welded later.
- On bottom of muff hearth, there is stainless steel towing rail for hearth sliding because of expanding & contracting.
- There are two nitrogen pipelines and one thermal couple inside the muff hearth.
- There is a separate pipeline on muff hearth for internal atmosphere measurement.
- There are total 10 thermal couples mounted on outside wall of muff hearth.
- Temperature control in 5 sections, both top and bottom, quick responding speed, no dead zone
- Electric heating wires can be drawn out from sides for changing or maintaining
6.5 Slag-removing room
A) Main data

Item	Data
Room length	1300mm
Nitrogen pre-heater	One unit
Internal material	316L
Max. Nitrogen flow	120m^3/h
Belt supporting rack	≥Φ16mm SS pipe

B)Main features
- Flux in brazing section is melt. When coming to less-temperature slag-removing room, flux will coagulate and drop to bottom of this room.
- Nitrogen pipeline is provided inside this room. Nitrogen gas for brazing atmosphere protection can be pre-heated through heat exchanger here. Nitrogen can be heated to 300ºC, thus saves electric consumption.
6.6 Static cooling room

Item	Data
Total length	3200mm
Internal surface material	SUS304, 6mm thick
Air cooling fan	Flow rate ≥20000m3/h
Temperature of workpiece at exit	≤200ºC

- Compulsive air cooling
- Side fences are designed into door type, openable for maintenance.
- Nitrogen flow meter and distributor are mounted in this section.

6.7 Rear curtain room

Item	Data
Total length	1500mm
Curtain material	0.05mm SS316L foil + 0.18mm fabric
Nitrogen inlet	one
Door damper max. Open height	200mm
Damper elevating	manual
Room insulation thickness	50mm

6.8 Air cooling room

Item	Data
Total length	3000mm
Wind curtain	PVC
Blowing fan	two
Exhausting fan	two
Temperature of workpiece at exit	Not more than 15ºC above ambient temperature

6.9 Driving device
- Driving motor is inverter control, Delta brand from Taiwan, speed adjustable
- Under transmitting rubber roller, there is one steel wire brush for removing flux adhered on the belt.
- Belt tension can be adjusted manually.
6.10 Air pipeline & Nitrogen gas pipeline
- Air pipeline: one exhausting fan for drying section, one for brazing section, four for air cooling section
- Nitrogen gas flow is monitored by several flow meters. Nitrogen gas can be filled to desired section directly when necessary.
- Nitrogen pipeline is equipped with electric-contact pressure meter which alarms when pressure is low.
- Nitrogen gas supply requirement: pressure 0.3MPa, flow 200m3/h, purity 99.999%.
- Impurity: O₂<10.0ppm; H₂<0.5ppm; Ar<3.9ppm; H₂O<0.2ppm; CO<0.5ppm; CO₂<0.2ppm; Others<0.2ppm.