1. Key Components of a THT Assembly Line

A THT assembly line typically consists of the following machines and systems:

1.1 Component Insertion Machines

• Manual Insertion Stations: Operators manually insert through-hole components into the PCB.

• Automatic Insertion Machines: Robotic systems that automatically insert components such as connectors, relays, and large capacitors.

• Axial and Radial Insertion Machines: Specialized machines for inserting axial (horizontal) and radial (vertical) components.

1.2 Wave Soldering Machine

• Function: Solders through-hole components to the PCB by passing it over a wave of molten solder.

• Key Features: Adjustable wave height, preheating zones, flux application, and nitrogen atmosphere options for improved solder quality.

1.3 Selective Soldering Machine (Optional)

• Function: Solders specific through-hole components without affecting nearby SMT components.

• Key Features: Precise solder application, programmable soldering paths, and compatibility with mixed-technology PCBs.

1.4 Conveyor System

• Function: Transports PCBs between different stages of the assembly process.

• Key Features: Adjustable speed, smooth transfer, and synchronization with other equipment.

1.5 Cleaning System (Optional)

• Function: Removes flux residues and contaminants from the PCB after soldering.

• Key Features: Environmentally friendly cleaning agents and efficient residue removal.

1.6 Inspection Systems

• Visual Inspection: Operators or cameras inspect solder joints and component placement.

• Automated Optical Inspection (AOI): Checks for defects such as insufficient solder, bridging, or misaligned components.

1.7 Unloader

• Function: Collects finished PCBs after the assembly process.

• Key Features: Stacking or sorting capabilities for efficient handling.

• 2. Key Features of THT Assembly Lines

• High Reliability: Through-hole components provide strong mechanical bonds, making them ideal for high-stress applications.

• Flexibility: Can handle a wide range of component types and sizes.

• Compatibility: Suitable for mixed-technology PCBs that combine both THT and SMT components.

• Scalability: Can be customized for low-volume, high-mix or high-volume production.