350mm Belt Width Thick Film Firing Furnace for Automotive Sensors with Computer Control

• After-sales Service: 12 Months
• Warranty: 12 Months
• Type: Thick Film Firing Equipmet
• Certification: CE, ISO
• Structure: Horizontal Type
• Brand: Hengli
• Model NO.: HSK3505-0811Z
• Max Temperature: 1050c
• Belt Width: 350mm
• Cooling Mode: Air Cooling
• Temperature Zone: 8 Zones
• Transport Package: Wooden Box
• Specification: 7355*1200*1350mm
• Trademark: HENGLI
• Origin: China
• HS Code: 8514390090
• Production Capacity: 800 Sets/Year

Product Description

HSK3505-0811Z Thick Film Firing Furnace

• Main Application:

This furnace is designed for thick film products firing, such as Hybrid IC, chip-R, SMD components terminal, LTCC, Stainless steel heater, PV thin film cell and other similar products.  

,Technical Specification: 

1. Max Temperature: 1050ºC,Temperature Range: RT~900ºC,
   1. The Effective Height of the Product: ≤50mm.
   2. Belt Width: 350mm.
   3. Belt Material: Cr20Ni80.
   4. Max Load on the Belt: 35Kg/m2(exclude the belt weight)
   5. Drive System: Big wrap angle friction drive.
   6. Belt Speed: 30~200mm/min, Stepless speed regulation control with frequency conversion, design belt speed 80~100mm/min.
   7. Heating Element:Use heating board.
   8. Firing Atmosphere: Dry and clean Compressed air.
   9. Atmosphere Control: 5 compressed air inlet pipes, flow measuring range: 10~95 L/min, the flow of each flowmeter is adjustable.
   10. Exhaust System: there is two exhaust stack in the Pre-Heating section.
   11. Cooling Mode: air cooling.
   12. Belt Cleaning Mode: Ultrasonic cleaning.
   13. The Layout of Furnace Structure: Please see the no. 3.1  
   14. Temperature Control Stability: ±1ºC.
   15. Chamber Temperature Uniformity: ±3ºC(Flat Temperature 850ºC),
   16. Temperature Zone: 8 Zones.
   17. Temperature Control Point: 8 points.
   18. Thermocouple: K type.
   19. Emergency Stop Button: There are two emergency stop buttons at the entrance and exit of the furnace.
   20. Alarm Protection: over temp, thermocouple failure, low gas pressure, other audible and visual protective alarm.
   21. Computer Control: 8 zones, use DCS control system, single loop intelligent temperature controller control, PID parameter auto-setting, industrial computer can carry out multiple programs saving, real-time temperature record, data saving and printing and other functions. Each temperature controlled point can be separately controlled by imported temperature controller.
   22. The Consumption of Compressed Air: 12~15m3/h.
   23. The Working Pressure of Compressed Air: 0.3-0.5MPa
   24. The Temperature of Furnace Surface: <35ºC.
   25. Discharge Temperature: <60ºC.
   26. Heating Power: 56Kw.
   27. The Insulation Power of the Empty Furnace: ≤20kW.
   28. Power: Capacity >75KVA, ,      Phase    Line, Single Phase Voltage:   V Frequency      HZ, the cable's color:         
   29. Weight: About 3000Kg.
   30. Overall Dimension: 7355×1200×1350mm (L×W×H).
   31. Furnace Appearance: outside panel uses high temperature spraying coating and off-white color.

,General Description
The furnace is devided into four major sections: furnace body, atmosphere control system, temperature control system and drive system.  
  
3.1  Furnace Body Design
Please see Table 1 and figure 1 for detailed layout of the furnace structure.

Feague 1:Furnace Layout Drawing
 

Table 1
No.	Name	Length	Note
A	Total Length	7335mm
B	Load and Unload Table	600mm	Distance from ground height 860 ~910 mm, the length of load and unload table is the same.
C	Furnace frame	6155mm
D	Entrance Vestibule Zone	350mm	Include entrance curtain (multilayer stainless steel sheet).
E	Entrance Insulation Zone	150mm	Ceramic fiber insulation
F	The Heating Zone	3600mm	8 zones, the length of each zone:450mm
G	Cooling Zone	450mm	No heating elements, Insulation material
H	Exit Insulation Zone	150mm	Ceramic fiber material thermal transition
I	Forced Air Cooling Zone	1455mm	No insulation material, mechanical fan blows the furnace tube directly.
J	Furnace Height	1350mm	Exclude the exhaust stack height
K	Equipment operation panel position

3.2Atmosphere Control System Design
There are 5 atmosphere pipes: The compressed air flowmeter is 10 to 95 L/min, Please see the Figure2 and table 2 for detailed gas layout.


Figure 2:Gas Layout Drawing

Table 2
Code	Name	Explanation
A	Entrance Curtains	Prevent outside air from entering the chamber
B	Burn off Gas Inlet	Used for normal air supplement of heating zone
C	Venturi Exhaust Gas Inlet	The manual valve on Venturi exhaust tube can be used for adjusting gas flow.
D	Cooling Zone Gas Inlet	Use for controlling gas flow direction to prevent the glue pollute the product in the high temp zone.
E	Exit curtains	To prevent outside air from entering the furnace to ensure that the firing process requirements of the products.
The actual gas flow of each pipe can be displayed by flowmeters

3.3 The Design of Temperature Control System

1. Temperature Measuring: use K type thermocouple independent measuring and control on the temperature control point of each zone.   
2. Temperature Control: use Intelligent temperature controller to control, with PID parameter auto tuning, high temperature upper limit alarm, thermocouple failure and other protective alarm functions.
3. Heating Control System: The heating control is powered by multiple AC contactors in groups to reduce the instantaneous current impact of the equipment on the power grid.
4. Control Mode:Solid State relay zero cross trigger mode.
5. Over Temperature Alarm: when over temperature occurred in some zones, over temperature alarm system in corresponding zones immediately send audible and visual alarm signal and meanwhile the heating of this zone is cut off, other zones normally work, the buzzer sounds alarm.

3.4  Drive System Design
3.4.1 Drive Control uses the frequency converter drive frequency variable motor to control the speed by gear box. The speed is adjustable continually.
3.4.2 Belt conveyor device: to drive the driving and drived wheel through chain and sprocket wheel, and then generate the friction force by driving wheel and the belt drive the belt running. There is a belt deviation guide device on the both sides at the entrance and exit.