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Chain type mesh
Belt gas fired tempering furnace 1500*14000*200mm.
Main technical parameter
Furnace type: support roller type mesh belt tempering furnace;
Total power of equipment: 960kw (natural gas power);
Electric power supply: 3p-380v, 50hz
Total length of equipment: about 168000mm;
Total equipment weight: 32000kg
Production capacity (tempering): 1000-1500kg/h (the output varies with the shape and size of the workpiece, the weight of a single piece and the stacking condition)
Rated temperature 350～ 500℃;
Rated size of equipment:
Mesh belt width: 1500mm
Heating length: 14000mm
Effective height:200mm
Power and medium consumption of production line
Electric power supply
Power: 380v ± 10% three-phase ac 50 hz
Power for measurement and control: 220v±10% 50hz
Power of transmission and other contacts: about 22kw
Normal operating power: about 18kw
Supply pressure of natural gas: 0.5-1bar; calorific value: 8400kcal/m3;
Natural gas power of tempering furnace: 960kw;
Actual consumption: about 15-20m3/1000kg.
1.Customer’s requirements
Parts to be treated: stablizing rod;
Material: 55Cr3.50CrV4.60SiCr7.54SiCr6;
Process:tempering of stablizing rod;
Output: 1000-1500kg/h (varying with product size, shape, and
other metallurgical conditions);
6. Mesh Belt Tempering Furnace Technical Details
The mesh belt tempering furnace adopts upper heating, and each heating
area is equipped with a circulating fan to achieve uniform temperature in the
furnace. The mesh belt is driven through the support rollers.
6.1 main parameters
6.1.1 mesh belt width: 1500mm
6.1.2 Length of heating zone: 14000mm
6.1.3 rated power: 960kw
6.1.4 Heating control: 56-zone; pulse control;
6.1.5 Furnace temperature uniformity: ≤± 5 ℃;wall surface temperature
rise: ≤ 45 ℃;
6.2 furnace body
Furnace shell:14000*2400*1860mm, made of 6mm steel plate and section
steel, and the furnace cover is divided into several pieces, removable and
easy to maintain. The underframe is welded with 100 *100mm square pipe
and 100# channel steel. The front end of the furnace body is provided with
a front frame
6.3 mesh belt driving device
6.3.1 mesh belt transmission is adopted for workpiece transmission.
6.3.2 the mesh belt adopts support roller transmission and rear driving type to
make the mesh belt bear the minimum tension at high temperature.
6.3.3 mesh belt transmission speed: 30 ~ 120min, Japan Mitsubishi inverter.
6.3.4 mesh belt: 1500*34000*2.0/3.0mm SUS304 Article 1
6.3.5 reducer: ASX120-155-1.5kW, 1 set;
6.3.6 support rollers: ￠50mm, SUS304, 56 pieces;
6.3.7 aluminum alloy seat, 112 pcs;
6.3.8 chain and sprocket: P=25.4mm, 1 set;
6.3.9 bearing, UCP207, 112 sets;
6.4 heat insulation material: insulating brick + refractory fiber;
6.4.1 The top adopts aluminum silicate fiber cotton wrapped with SUS304
stainless steel plate as the air guide hood. The lining thickness is 280mm.
6.4.2 The furnace wall adopts insulating brick T3-08 + cera blanket 1260,
and the lining thickness is 330mm.
6.4.3 Insulating brick T3 + calcium silicate board 1000 are used at the
furnace bottom, and the lining thickness of furnace bottom is 250mm.
6.4.4 The silica gel is used as the refractory adhesive, which has the
characteristics that the higher the temperature is, the stronger the contact
surface is.
6.5 heating device
6.5.1 All the main natural gas pipelines are connected by welding or flange,
and threaded joints are sealed with special sealant. Leakage detection is
carried out after pipeline installation. Matching natural gas flowmeter is installed
at the inlet of natural gas pipeline. Limit temperature protection system is set in
combustion chamber and furnace of each zone to set limit protection temperature.
Once the temperature is out of control and ultra-high, it can cut off the gas
system and relevant safety facilities in time.
6.5.2 In case of gas system failure and over limit temperature, it is necessary to
automatically cut off the main gas valve in time and give audible and visual alarm.
6.5.3 combustion control system
Each set of high-speed burner is equipped with stable and reliable SIC65HB
burner controller. The functions of purging, ignition, flame detection and flameout
protection are completed in the control system, and the on-site controller completes
the functions of ignition, flame detection and on-site commissioning. Each burner is
equipped with a flameout alarm device to realize automatic flameout monitoring and
power-off valve closing protection. Once the burner goes out or burns poorly, the
control system will immediately cut off the natural gas solenoid valve in front of the
burner and give an alarm. At the same time, all valves are electrically closed, which
will automatically cut off the valves in case of power failure to prevent accidents.
The automatic control system adopts advanced on-off pulse control mode,
which has the advantages of accurate temperature control, improving the
temperature uniformity of radiation tubes and making the furnace temperature
more uniform. The conveyor heat treatment furnace temperature control outputs 220V
valve position control signal to the burner controller through PLC according to the thermocouple
signal and PID operation, so as to control the combustion and stop of the burner.
When the actual furnace temperature is much lower than the set furnace
temperature, the burners in the whole temperature control area burn in a large fire.
When the actual furnace temperature is close to the set furnace temperature, the
PLC will reduce the number of combustion burners through PID operation. The
burners that stop combustion are controlled by PLC and stop automatically, so as
to improve the uniformity of furnace temperature. At the same time, the time ratio
of combustion and shutdown of each burner can be set in PLC. The air-gas ratio
and air-gas synchronization during burner combustion are controlled by the
air-gas proportional valve. When the air solenoid valve is opened, the air volume
increases, and the air-gas proportional valve automatically opens at the same
time to increase the gas supply, and vice versa. Each burner is equipped with
an air-gas proportional valve to realize the proportional combustion of burner
air and gas, and has the synchronization of air and gas. In addition, the air-gas
proportional valve also has the pressure stabilizing function to make the
pressure in the gas pipeline more stable.
6.5.4 natural gas burner: SIC-65, 60kW, 16pcs;
Radiating pipe: ￠ 120mm, 16pcs;
6.5.5 intelligent temperature controller: Honeywell, 6 sets;
6.5.6 thermocouples: WRN430-800-K type, 6 pieces;
6.6 forced circulation fan, 6 sets;
Vanes connected with shaft, ￠ 500mm SUS304, 6 sets;
Bearing ( NSK), UCFY211.209, 12 sets;
Motor.2.2kw, 6 sets;
Air cooling device 6 sets;
Rotation measuring switch, 6 sets;
6.7 transmission fault detection switch, Omron, Japan, 1 set;
7. Control cabinet
Cabinet size: 600*700*2000.1 set;
The heat treatment furnace has a PLC to centrally control the operation,
overtemperature, transmission and other faults, audible and visual
alarm and safety interlock, and a touch screen to observe the working
conditions at any time.
