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Total loading power: 316kw; normal power: 150-200kW
Total length: about 26.6m
Total Weight: 32000kg
Productivity: Quenching: 150-250kg/h
Total Length: About 26.6m
Measuring And Control System: 220V±10%, 50HZ
Heating System: About 291kW
Working temperature:
Quenching furnace:800～920℃; quenching tank.60～80℃; post-cleaning
machine: 40～60℃; tempering furnace: 200～450℃;
Productivity
Quenching: 150-250kg/h ( varying with the workpiece size, weight, stacking method, and other related conditions)
Furnace atmosphere
Quenching furnace: methanol+propane+ammonia
Tempering furnace: air
Mesh belt type quenching furnace
Mesh belt width: 500 mm
Inlet length: 2000 mm
Preheating belt length: 1500mm
Working area length: 6000mm
Effective height: 100mm
Quenching oil tank
Mesh belt width : 800mm
Oil tank depth: 2000mm
Oil tank length: 4200mm
Tank volume: 10 m3
Post-cleaning machine
Mesh belt width : 800mm
Effective length: 2400mm
Tank volume: 2m3
Mesh belt tempering furnace
Effective height: 100mm
Mesh belt width : 800mm
Heating area length: 6000mm
1. Basic Requirement
1.1 product: self-tapping screw, steel wall screw.
1.2 process: carburizing, carbonitriding, bright quenching and tempering;
1.3 productivity: quenching: 150-250kg/h;
4. Equipment General Introduction and Main Features
1. General Introduction
1.1 The belt type furnace combines the advanced technologies from
Taiwan. Its key parts are imported from overseas.
1.2 The production line is comprised of support roller quenching furnace,
quenching tank, oil removing stand, post-cleaning machine, support-roller
mesh belt tempering furnace, and electrical control system.
2. Features:
2.1 To meet the production needs of fastening parts, the furnace employs
Taiwan technology, and improves its energy-saving effect in the area of
refractory lining.
2.2 The belt typep furnace employs low-voltage heating through the transformer
to prolong the service life of the heating tubes.
2.3 The mesh belt is supported by the support rollers with synchronized
movement so that the mesh belt bears a minimum tension.
2.4 The rollers are supported by special high-pressure sealed bearing.
2.5 The mesh belt is designed with abnormal transportation alarm device to
assure the stable movement of the mesh belt.
2.6 The drip-in atmosphere of the conveyor mesh belt furnace
is gasified by a gasifier and then sent into the furnace.
The atmosphere is monitored and controlled continuously
by an oxygen probe.
6. Technical Specification Per Unit
Mesh Belt Quenching Furnace
The quenching furnace is the key part of the mesh belt furnace production line
It is comprised of furnace shell, front machine stand, heat preservation material,
heating device, temperature control device, and atmosphere supply device.
Main parameters:
Mesh belt width :500mm
Working area length: 6000mm
Entrance length: 2000mm
Preheating area length: 1500mm
Temperature control: 4-zone PID control;
Rated power: 160KW
Furnace temperature uniformity:≤±5℃ temperature uniformity for the
same section:≤±3℃; furnace outer wall temperature rise: ≤50℃
Mesh belt driving device
2.1 The parts are conveyed through the mesh belt.
2.2 The mesh belt is supported by the support rollers with
synchronized movement. The mesh belt is of the front-driven type,
and thus bears a minimal tensile force at high temperature.
2.3 mesh belt driving speed:50～220mm/min, inverter control;
2.4 mesh belt: 500*22000*1.8/2.3mm; 1 piece;
2.5 support rollers
Preheating upper rollers, ￠50mm SUS304 5 pieces;
Preheating lower rollers, ￠87mm SUS304 3 pieces;
Upper rollers, ￠50mm SUS310 19 pieces
Lower rollers, ￠87mm SUS310 7 pieces
Rear driving roller, ￠203mm SUS310 1 piece
Bearings, UCFL207 68sets
2.6 chain and sprocket wheel, P=19.05mm, 1 set
2.7 reducer, 0.75kW 1 set;
2.8 inverter, Mitsubishi, 1 set;
2.9 mesh belt driving detection device, Omron 1 set
3.Heat preservation material
3.1 The inside roof wall is lined with 1400 high temperature silicate
aluminum + 1260 silicate aluminum cera blanket. The lining material
is fixed by ￠8mm rods and SUS310 anchoring parts.
3.2 The electrical resistance mesh belt furnace side walls
are lined with Isolite anti-carburizing bricks,
heat preservation bricks and heat preservation boards. The lining
thickness is 395mm.
3.3 The refractory adhesive is domestic famous brand. It has the
characteristics of stronger bonding effect at higher temperature.
4. Heating device: electrical heat radiation tubes.
4.1 The electrical heating tubes are installed in the upper and lower wall
of the hearth. The heating system works with low voltage power supply,
and the furnace doesn’t need to be stopped when replacing the heating tubes.
4.2 Electrical heat radiation tubes, 36 sets;
a) outer pipe: ￠122*1325*4mm (SUS310S), 36 pieces;
b) heating tube core: OCr21Al6Nb, 36 pieces;
c) insulation parts (corundum): 36 pieces;
4.4 Each zone is set with an independent transformer. The heat radiation
tube is in parallel connection, and doesn’t interfere with each other.
The heat radiation tubes are easily maintained.
5. Mixing fan (NSK bearing with water cooling system), 2 sets;
vanes (shaft and vanes), 2 pieces;
bearing, NSK, 4 sets;
motor, 1.5kw, 2 sets;
6.Exhaust fume device ( removing and burning the fume of the furnace
and the oil tank)
Air pump, 250W, 1 set
Water cooling heat isolation protection board on the loading side of the
front stand, 1 piece;
Furnace door
a) movable furnace door at the furnace mouth, 1 set;
b) soft curtain door inside the furnace, 4 pieces;
9. Dust removal hole, 12 pieces;
The dust holes are set at the lower part of the two side walls of the preheating
and the heating section. The dust hole is blocked with a plug made of the heat
preservation fiber and cover plate. The plug is fixed by the lever mechanism,
and is easy to be removed.
10 The mesh belt conveyor furnace door is also equipped with 1 fire curtain
to heat the cleaning liquid in the cleaning tank.
11 atmosphere supply device
atmosphere supply: drip-in type: methanol+propane+ammonia;
11.1 Atmosphere control:
Oxygen probe, marathon, USA, 1 piece;
Carbon potential controller, Eurotherm, 1 set;
Proportional valve, Burket, Germany, 1 piece;
Methanol flow meter, 4 sets;
Ammonia flow meter, 1 set;
Propane flow meter, 4 sets;
Reference air flow meter, 2 sets
Air pump, 8W, 2 sets
Safety
The two side walls of the preheating and heating section are both
protected through the perforated cover plate.
13 mesh belt driving device, Omron, 1 set;
