Air conditioner indoor unit assembly line (home appliance industry)
Category:
Industry News
Published:2025-12-22
A certain home appliance manufacturer needs to perform the entire process—component assembly (evaporator/fan), leak testing, and packaging—for an indoor air-conditioning unit (dimensions: 500mm × 300mm × 200mm; weight: 8kg). The conventional horizontal production line requires a length of 100 meters, and the leak-testing section (which demands a sealed environment) must be physically separated from the packaging section, resulting in low space utilization.
Solution: Adopt a two-tier, high-speed chain assembly line with the following structure:
Lower level: Component assembly (evaporator/fan installation, height 1.2m, horizontal transfer of workpieces, assembly stations arranged along both sides of the production line).
Upper level: Leak testing (nitrogen-filled detection) → Packaging (height: 4.0 m; workpieces are transferred from the lower level to the upper level via a vertical lift).
Cyclic Logic: Non-conforming products that fail the leak test are conveyed in reverse via the upper-level high-speed chain to the lower-level assembly section for rework. After repair, they re-enter the upper-level leak testing stage, creating a cycle of “Lower Level → Upper Level → Lower Level (Rework) → Upper Level.”
Key design:
Speed-chain selection: The upper layer uses an antistatic speed chain (the leak-detection section must avoid electrostatic interference), while the lower layer uses a standard speed chain (suitable for general assembly requirements).
Elevator Design: A reciprocating elevator (with a capacity of 50 kg and a speed of 0.4 m/s) is used for transporting items from the lower level to the upper level; a spiral multi-speed chain is employed for the return section from the upper level to the lower level (saving space and reducing transfer time to ≤4 seconds).
Leak Detection Section Adaptation: The upper-speed chain is equipped with a sealed chamber in the leak detection section (which automatically closes after the workpiece enters and is then filled with nitrogen for testing). Leak levels are monitored via pressure sensors, while the high-speed chain temporarily halts conveying to ensure sufficient detection time (30 seconds per part).
Effect:
The production line length has been reduced from 100 m to 40 m (a 60% reduction). The leak detection section and the packaging section are physically isolated through a vertical layout (preventing nitrogen leakage).
The cycle time has been reduced from 75 seconds per unit (on the horizontal production line) to 55 seconds per unit (with vertical circulation reducing empty-trip transportation time).
Leak detection accuracy improved by 25% (using a combination of a sealed chamber and pressure sensors, reducing the false-negative rate from 5% to 1.25%).
Artificial intervention reduced by 80% (through a high-speed chain + elevator, enabling a fully automated rework process).
Summary of Core Advantages and Design Key Points
1. Core Advantages
High space utilization: By adopting a vertical layout, two processes can be stacked within a limited height (e.g., a 6-meter factory building can accommodate two levels), saving 50% to 70% of the floor area.
Increased throughput: Short vertical conveying distance (e.g., only 5 seconds to move from the lower to the upper level), reducing empty travel time during horizontal conveyance and boosting overall efficiency by 20%–40%.
Flexibility: The speed chain supports the cyclical use of work fixtures, enabling rapid switching between different products (e.g., using the same production line for both mobile phone frames and tablet frames).
Precise positioning: The speed chain utilizes frictional transmission between the chain and the fixture plate, achieving a positioning accuracy of ±0.2 mm and making it suitable for high-precision applications such as robots and inspection equipment.
2. Design Key Points
Floor height planning: The lower-floor height must be suitable for equipment operating spaces (such as CNC machine tools and welding robots), typically ≥1.2 m; the upper-floor height must allow sufficient space for the installation of inspection and packaging equipment, typically ≥2.5 m.
Cycle mode selection: For light loads (<50 kg), prioritize the spiral multi-speed chain (space-saving, fast transfer); for heavy loads (>50 kg), choose the reciprocating lift (stable, high load capacity).
Safety Protection: The vertical sections must be equipped with protective nets and emergency stop buttons (one per floor). The lift must be fitted with a fall-prevention device to ensure the safety of both personnel and equipment.
Process Interconnection: The upper and lower layers should be designed with “soft docking” (such as cushioning mechanisms or visual alignment) to prevent hard collisions that could damage the workpieces. Critical processes (such as leak testing and glue application) must include pause zones to ensure adequate process timing.
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