Air conditioning assembly line

Air‑conditioning Assembly Line Process:The pictures show a mixed‑model final‑assembly production line for multiple types of air‑conditioning units, which supports the manufacturing of household split air‑conditioners, commercial air‑conditioning units and special air‑conditioning products. The production line consists of circular rotating tooling conveying stations, main roller conveyor lines, vacuum‑evacuation and refrigerant‑charging stations, and complete‑unit performance test chambers. The first picture presents a circular rotating vacuum‑evacuation station. Circulating orange tooling trolleys are equipped with vacuum units and control boxes. The tooling bases carry air‑conditioner chassis and circulate along circular tracks to realize parallel vacuum‑evacuation operations at multiple stations. The second and fourth pictures display the outdoor‑unit final‑assembly circular line. Blue circular roller conveyors transport condenser‑fan assemblies. Each station is fitted with independent vacuum systems and control cabinets. Operators complete pipeline connection and pre‑treatment before leak detection. The third picture shows the main assembly line for commercial air‑conditioning units. Heavy‑duty roller conveyors carry unit chassis composed of compressors, copper pipe circuits and heat exchangers, suitable for assembling heavy‑weight commercial air‑conditioning units.

After being delivered by roller conveyors, chassis components go through pre‑treatment procedures. Compressors are fixed with shock‑absorbing mounts. Copper pipelines between heat exchangers and compressors are welded to form refrigeration loops. For different product types, household air‑conditioners adopt small‑displacement compressors and fin‑type heat exchangers, while commercial units are equipped with large‑capacity compressors and reinforced heat‑exchange assemblies with larger‑diameter copper pipes and stricter welding requirements. After welding, work‑pieces are transferred to the circular rotating vacuum‑evacuation station. Tooling trolleys run synchronously with products. Multiple vacuum sets connect to refrigeration pipelines to achieve high‑system vacuum. Pressure‑monitoring units judge vacuum quality. Units failing vacuum requirements are diverted to rework branches.

Units with qualified vacuum status move to the refrigerant‑charging station. Refrigerant is quantitatively filled according to process parameters for household and commercial models, followed by pipe tail‑sealing welding. Subsequent processes include electric box installation, wiring harness connection and fan & sheet‑metal housing fitting. Household indoor/outdoor units and commercial units run on the same line. RFID identifies each model and invokes corresponding assembly parameters. Fully‑assembled units are sent into sealed performance‑test chambers for power‑on tests, including insulation‑earthing safety inspection, fan operation check, high‑low pressure sampling, cooling & heating condition verification. Actual operating conditions are simulated to validate unit parameters. Non‑conforming units are transferred to rework areas for troubleshooting of pipeline leakage, electrical defects and system abnormalities.

Units passing performance testing flow to final visual inspection. Sheet‑metal surfaces are cleaned; process protective films are removed. Nameplates, energy‑efficiency labels and circuit‑diagram stickers are applied, and accessory kits are fitted. Products then enter packaging sections with protective film wrapping, corner protectors, carton packing and automatic sealing & strapping. Finished goods are off‑loaded and warehoused.

The whole air‑conditioning production line adopts a layout combining heavy‑duty roller main lines and circular rotating circulating stations. It satisfies assembly requirements for lightweight household air‑conditioners and heavy‑duty commercial air‑conditioning units and enables mixed‑model production of various air‑conditioner categories. MES data acquisition is deployed on‑site to record full‑process data of welding, vacuum evacuation, refrigerant charging and performance testing, realizing full‑process traceability for each individual unit.

1. Assembly line plans corresponding to various types of air conditioners

a. Light products ≤20kg are suitable for belt conveying lines, and continuous conveying is achieved through fixed conveyor belts to ensure the continuity of production. Cooperate with multi-station robots to complete repetitive operations such as screw tightening and pipeline welding.

b. Medium-sized products of 20-100kg, such as cabinets and machines, can be transported by rollers, with strong load-bearing capacity, and can be driven by motors to achieve intermittent movement, which is convenient for operation at each workstation.

c. Heavy products ≥100kg, such as central air conditioning and external machines, need to be equipped with AGV or rail conveyor vehicles

2. Practical value in air conditioning production line application

a. Efficiency and production capacity improvement: Compared with manual production, automated assembly lines can break through production capacity bottlenecks. The single-shift production capacity of the on-hook line can reach 1,000 – 2,000 units (30 seconds per unit), and it can be produced continuously 24 hours a day, requiring only a small number of personnel monitoring; the single-shift production capacity of the off-hook line is 300-800 units (1-2 minutes per unit), which is 50%-100% higher than that of the artificial line.

b. Quality stability guarantee: Automated assembly lines can reduce the uncertainty of manual operations and make product quality more stable. When the robot tightens the screws, the torque error is ≤±5%, and the leakage will automatically alarm; when the refrigerant is automatically charged, the dose error is ≤±1%.

c. Flexible adaptability: Faced with the characteristics of “small batches and multiple varieties” of market orders, the flexibility advantages of automated assembly lines are obvious. It can support mixed-line production of 3-5 models, such as hanging up production in the morning and small cabinet production in the afternoon, improving production flexibility. A suitable air conditioning automation assembly line solution can not only meet current production needs, but also reserve room for future expansion, such as reserving robot interfaces and supporting MES system upgrades to adapt to product iterative changes.

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