Explain in detail the reflow soldering

Abstract:
A detailed explanation of the structure of reflow soldering
System overview
Reflow soldering is also called "reflow" or "re flow soldering machine" (Reflow Machine), it is by providing a heating environment, the solder paste is heated to melt so that the surface mount components and PCB pad through the solder paste alloy reliably combined equipment.   According to the technical development is divided into: vapor phase reflow, infrared reflow, far infrared reflow, infrared heating air reflow soldering and reflow soldering. According to the welding of special needs, reflow furnace containing nitrogen.   At present more popular and useful mostly far infrared reflow, infrared heating air reflow soldering and reflow soldering.   According to the shape can be divided into desktop reflow furnace and vertical reflow oven, a brief introduction of these two.
1, desktop reflow oven
The desktop device suitable for medium and small quantities of PCB assembly, stable performance, price economy (between 4-8 million RMB about), domestic private enterprises and some state-owned units with the more.
2, vertical reflow oven
Vertical production models are more suitable for different needs of users, the PCB assembly.   Equipment of high middle and low there, performance is relatively small, the price is ranging from low to high (between 8-80 million RMB about).   The foreign and domestic research, with many well-known enterprises.   The reflow solutions is a Guangdong equipment limited by nitrogen EVOC "EVOC" construction of computer and automation system composed of IPC + SSR protection lead-free EP series hot air desktop reflow machine.   Small circular design unique use of the system, so that the hot air circulation heating independent of each temperature zone.   Computer analysis database can store all customer data, and temperature curves of different, so that the temperature setting data for reference, can realize automatic detection function, can automatically detect the chain operation, and ultra high temperature alarm function.   After running the test that the system is stable and reliable, users get the praise; the system can also be applied in the industrial process control field.
System structure
1, the system requires a control center
Function:
The monitoring work the reflow soldering machine.
The set and control the operation of conventional.
◆ to perform administrative functions, is responsible for all the work scheduling, allocation and arrangement, the good operation.
2, the whole system task
◆ routine or monitoring function scheduled; such as: temperature detection, regulation and control, the transmission speed and direction detection and control function.
◆ automatic detection function, can automatically ultra high temperature alarm function.
◆ directly and quickly to control and analysis functions.
The system adopts double for temperature, decreasing PCB plate bending deformation, the control accuracy of high temperature requirements.
The main demand, system 3
The switch quantity input channel feedback (signal)
The switch quantity output channel (SSR)
The serial output control (control transmission belt speed)
Output the analog (to control hot machine, to achieve temperature control)
The analog input (thermocouple signal input)