Natural Gas Mesh Belt Conveyor

Tempering Furnace for Spring Parts

1.Customer’s requirements

Parts to be treated: carbon steel spring clips;

Heat treatment process: tempering;

Output: 250kg/hour.

2.Specification of equipment

Based on the above requirements, we recommend gas fired

mesh belt tempering furnace 600*5000*120mm.

3.Main technical parameter

3.1 Electricity

3.1.1 Electric power: 380V±10%, 3phase AC, 50HZ;

3.1.2 Measurement and control: 220V±10%, 50HZ;

3.1.3 Transmission and other contact point power: approx 11KW;

3.1.4 Normal working power: approx 8KW.

3.2 Gas

3.2.1 Fuel: Natural gas

3.2.2 Gas contact point pressure: 0.5-1bar;

3.2.3 Heat value: 8400Kcal/m3;

3.2.4 Tempering furnace: 240KW；40KW*6pcs;

3.2.5 Temperature: max 650℃;

4.Technical Specification

The mesh belt tempering furnace consists of front rack, furnace body,

furnace lining, heating system, hot air circulation system and transmission

system. The furnace adopts upper heating method. Each heating zone has

a circulation fan to achieve a unified furnace temperature. The tempering

furnace is driven by support roller.

4.1 Main parameter:

4.1.1 Conveyor width: 600mm;

4.1.2 Heating length: 5000mm;

4.1.3 Heating power: 240KW (natural gas);

4.1.4 Heating control: 3 zones, PID control;

4.1.5 Temperature uniformity: ≤±5℃;

4.1.6 Furnace surface temperature rise: ≤45℃;

4.2 Front rack

The front rack is a feed stand for tempering furnace, which consists

of rack and support roller.

4.2.1 Size of rack: 1500*800*980mm;

4.2.2. support roller: ￠219mm;

support roller: ￠89mm;

4.3 Furnace body:

The conveyor belt furnace body consists of furnace shell and bottom frame, which is

welded by 5mm steel plate and #10 channel steel

4.3.1 furnace body: 5000*1475*1760mm;

4.3.2 Each zone of upper cover can be opened separately which is

convenient to maintenance

4.4 Conveyor and conveyor transmission system:

4.4.1 The transmission of workpiece is through mesh belt;

4.4.2 The transmission of mesh belt is through support roller and it adopts

rear drive type to make the mesh belt bear the minimum tension under

high temperature.

4.4.3 Mesh belt transmission speed: 30～120mm/min, Mitsubishi

frequency control;

4.4.4 Mesh belt: 600*16000*1.2/1.8mm, SUS304S, 1 pc;

4.4.5 Bracket: 600*5000mm, SUS304, 1 pc;

4.4.6 Sprocket wheel: P=19.05mm, 1 pc;

4.4.7 Reducer, BWEY121-43*43-0.75KW, 1 set;

4.5 Furnace lining

The furnace lining adopts composite lining.

4.5.1 Furnace wall: light weight insulating brick+ aluminum silicate

fiber blank;

4.5.2 Furnace bottom: light weight insulating brick+ aluminum silicate

fiber plate;

4.5.3 Furnace roof: aluminum silicate fiber cotton, which is wrapped inside

the air guide plate;

4.5.4 High temperature adhesion agent: 1000

4.6 Heating System

The mesh belt furnace is heated by natural gas. The gas burners

are installed horizontally at the upper part of the furnace hearth.

4.6.1 Gas burner: 40KW/pc;

4.6.2 Radiating tube: ￠120mm, SUS304;

4.6.3 Temperature controller: Honeywell;

4.6.4 Thermal couple: K type;

4.7 Circulation fan

Each zone has a circulation fan which is equipped on the furnace roof to

achieve the unified furnace temperature.

4.7.1 Blade shaft: ￠55mm SUS304;

4.7.2 Centrifugal blade: ￠360 SUS304;

4.7.3 Bearing: (NSK) UCFY211,209;

4.7.4 Motor: 1.5KW (oil cooling)

4.8 Mesh belt transmission detector device: Omron, Japan;

4.9 Cooling system

Axial flow fan: 0.55KW; which is installed at the exit of the furnace for

cooling the workpiece.

4.10 Control cabinet

Cabinet size: 600*700*2000,1 set;

The mechanical transmission and auxiliary heating of the belt type furnace is

controlled by the PLC. The control system has the over-temperature alarm

and driving fault alarm. Also there is a simulation screen to show the working

performance of the tempering furnace. The mesh belt can rotate clockwise

and anticlockwise in case of blockage.