BC700 Inline PCBA Cleaning Machine for Automatic Flux Removal

Product Description

The BC700 Inline PCBA Cleaning Machine is designed for automatic in-line removal of flux residues and other process contaminants from PCBA surfaces. It combines multi-stage chemical washing, DI water rinsing, air drying and hot-air drying in one continuous system.

The machine uses a conveyorized transport system with adjustable upper and lower spray nozzles. As each PCBA passes through the machine, heated washing chemistry softens and breaks down flux residues, while high-pressure spray provides the mechanical force required to remove loosened contaminants from the board surface.

The BC700 uses three consecutive washing stages to provide sufficient washing time for demanding PCBA applications. The washing solution is circulated through a filtration system and can be automatically replenished and discharged through the built-in diaphragm pump system.

After washing, the PCBA passes through a chemical isolation section followed by pre-rinsing, rinsing and final DI water spray rinsing. The multi-stage rinse system removes residual washing solution from the board and uses a rear-to-front overflow arrangement to maintain rinse water quality and improve final cleanliness.

The final air drying and hot-air drying sections remove residual water from the PCBA before discharge. Drying temperature can be adjusted according to the product and process requirements.

The BC700 is suitable for integration into automated SMT production lines. The machine can be connected with board loaders, unloaders, conveyor transfer systems and other upstream or downstream equipment through SMEMA communication.

Process Flow

Board In → Chemical Wash 1 → Chemical Wash 2 → Chemical Wash 3 → Chemical Isolation → DI Water Pre-Rinse → DI Water Rinse → Final DI Water Spray Rinse → Air Dry→ Hot-Air Dry 1 → Hot-Air Dry 2 → Board Out

Working Principle

During the washing process, the PCBA is transported through each functional section at a controlled conveyor speed. Heated washing chemistry acts on flux residues to soften and decompose them, while the spray pressure provides mechanical separation and carries the contaminants away from the board surface.

The following multi-stage DI water rinsing process removes residual washing chemistry from the PCBA. Rinse water enters from the final rinse section and flows toward the preceding rinse stages through controlled overflow, helping reduce water consumption while maintaining rinse quality.

After rinsing, adjustable air drying knives remove surface water before the PCBA enters the two-stage hot-air drying section. The dry PCBA is then transferred out of the machine for the next production process.

Key Features

Three-stage chemical washing for effective removal of flux residues and process contaminants.
Multi-stage DI water rinsing with rear-to-front overflow for improved rinse performance.
Upper and lower spray nozzles arranged symmetrically for uniform coverage of both sides of the PCBA.
Adjustable spray angle and pressure to accommodate different products and process requirements.
Adjustable chemical isolation and air-dry parameters for better control of chemical carryover.
Real-time pressure monitoring for washing, rinsing, chemical isolation and air drying sections.
Circulating washing solution filtration for extended solution service life.
Automatic washing solution and concentrate dosing and discharge through diaphragm pumps.
Built-in concentrate tank for automatic chemical replenishment.
Dual condenser recovery system for reducing loss of washing solution.
DI water resistivity monitoring for rinse water quality control.
Energy-saving mode for reduced utility consumption during standby or low-load operation.
SMEMA interface for connection with upstream and downstream SMT equipment.
MES interface software available as an option for machine status and production monitoring.
Board detection and memory functions at the machine inlet and outlet.
Leak detection and water leakage protection as standard.
Multiple safety protection systems, including phase-loss, phase-sequence, overcurrent, overload, surge, liquid-level and temperature protection.
Three-layer protection structure around the washing and rinsing sections to minimize liquid leakage.
Optional real-time washing solution concentration monitoring and compensation system.
SUS304 stainless steel construction with TIG welding for corrosion resistance and long-term structural durability.
PC + PLC control system with English and Chinese operating software.

Construction

The BC700 consists of three main functional sections:

1. Washing Section

The washing section includes three chemical wash stages. Heated washing solution is sprayed onto the upper and lower surfaces of the PCBA to soften, decompose and remove flux residues.

The extended washing section provides sufficient process time for applications requiring thorough flux removal. The washing solution is circulated and filtered during operation.

2. Rinsing Section

The rinsing section consists of DI water pre-rinsing, DI water rinsing and final DI water spray rinsing.

Fresh DI water enters at the final rinse stage and flows toward the preceding rinse stages by controlled overflow. This counter-flow arrangement helps maintain rinse water quality while reducing unnecessary DI water consumption.

A DI water resistivity meter is provided for monitoring incoming rinse water quality.

3. Drying Section

Following the final rinse, the PCBA passes through adjustable air dry knives to remove surface water. Two hot-air drying stages then remove remaining moisture before the board exits the machine.

The drying temperature can be adjusted up to 100°C according to the product and process requirements.

Technical Specifications

Item	Specification
Maximum PCBA Size	W600 × T100 mm
Conveyor Width	600 mm
Conveyor Speed	0.1–1.5 m/min
Conveyor Height	920 ± 25 mm
Conveyor Direction	Left to Right
Washing Solution Temperature	RT–80°C
Pre-Rinse Water Temperature	RT–65°C
Rinse Water Temperature	RT–60°C
Final Spray Rinse Water Temperature	RT
Drying Temperature	RT–100°C
DI Water Supply	6–15 L/min
Exhaust Port	Ø250 mm
Exhaust Air Volume	42 m³/min
Total Power	151 kW
Power Supply	AC 380 V, 3 Phase, 50/60 Hz, 300 A
Compressed Air	0.5–0.7 MPa, 200 L/min
Machine Dimensions	L7000 × W1800 × H1700 mm
Machine Weight	Approx. 4200 kg

Note: RT = Room Temperature.

Control & Safety Functions

The BC700 incorporates multiple monitoring and protection functions for stable operation in an automated production environment.

Standard functions include:

Washing, rinsing, chemical isolation and air drying pressure monitoring
Washing solution high/low level protection
Rinse water high/low level protection
Washing solution over-temperature protection
Rinse water temperature protection
Hot-air over-temperature protection
Leakage detection
Phase-loss and phase-sequence protection
Electrical overcurrent and overload protection
Electrical surge protection
Emergency stop switches at the machine inlet, outlet and operating panel
Machine grounding resistance below 1 Ω
Separate electrical control cabinet
Leakage protection circuit breaker for the main power supply
Board entry and exit sensing
Board tracking and timeout detection
Automatic standby and energy-saving functions

Automation & Line Integration

The BC700 is designed for integration into automated SMT production lines. Its conveyor system and SMEMA interface allow communication with upstream and downstream equipment.

The machine can be configured as part of a complete PCBA cleaning line with:

Board loaders
Board unloaders
SMT conveyors
Reflow oven
Inspection and testing equipment
Other automated material handling equipment

MES communication software is available as an option for production monitoring and machine status management.

Optional Configuration

Washing Solution Concentration Monitoring & Compensation System

An optional concentration monitoring system can continuously monitor the washing solution and provide automatic compensation according to the configured process parameters.