Refrigerator assembly line

Refrigerator Assembly Line Process:After the refrigerator cabinet completes polyurethane foam curing in the foam maturing section, it is conveyed by roller conveyors to the pre‑assembly processing section of the refrigerator production line. First, cabinet cleaning is performed to remove foam flash and internal debris. The refrigeration compressor and pipeline assemblies are pre‑mounted, and compressor pipelines are welded to the built‑in evaporator pipelines of the cabinet to form a complete refrigeration circuit. Upon completion of welding, cabinets are transferred to the rotary circular leak‑testing station for refrigeration systems on the refrigerator assembly line shown in the figure.

Positioned by roller‑conveyor tooling, cabinets circulate along a closed circular loop. This station is equipped with multiple sets of quick‑connect couplings, high‑pressure charging pipelines and halogen leak‑detection acquisition units to carry out air‑tightness inspection on welding points and pipe joints of the refrigeration circuit. The equipment travels synchronously with cabinets on the rotary turntable to complete pressure holding and leak‑judgement operations. On‑site operators conduct station condition patrol inspection, identify defective cabinets and verify tooling status. Process refrigerant pipelines, electrical control cabinets and ventilation & exhaust systems are arranged above the steel‑structured production line. MES data acquisition is deployed to record leak‑test results for each cabinet in real time. Leak‑defective units are diverted via lifting transfer devices to rework spurs for pipe repair welding and re‑leak testing.

After passing leak testing, cabinets exit the circular line and proceed downstream along the refrigerator production line through subsequent assembly processes:

Vacuum Evacuation and Refrigerant Charging Station: Refrigeration pipelines are coupled to achieve high‑vacuum evacuation of the system. Refrigerant is quantitatively charged according to model‑specific process parameters, followed by pipe tail‑sealing welding to seal off the refrigeration circulation system.

Pre‑assembly and Component Fitting Station: Peripheral compressor accessories, electrical wiring harnesses, temperature‑control components and water drip trays are installed sequentially. Cabinets then move to the door assembly station, where refrigerator fresh‑food and freezer doors are hung via hinge mechanisms. Door gaskets, inner shelves, crisper boxes and other interior trims are fitted.

Complete‑unit Power‑on Performance Test Line: Cabinets enter long‑distance static test roller conveyors for full‑unit power‑on. Electrical safety tests, insulation‑grounding checks, refrigeration condition verification and noise measurement are performed. Units run for specified process durations while cabinet cooling curves are captured and overall operating parameters are validated. Non‑conforming products are diverted to rework lines for fault diagnosis.

Final Visual Inspection and Accessory Fitting Section: Cabinet exterior cleaning is completed; process protective films are removed. Nameplates, energy‑efficiency labels and circuit diagram stickers are applied. Exterior parts such as door handles are mounted, together with instruction manuals and accessory kits.

Packaging and Off‑line Section: Protective film wrapping and outer carton packing are carried out, followed by automatic carton sealing and strapping. Finished products are off‑loaded and warehoused, concluding the complete unit manufacturing workflow.

The entire refrigerator assembly line adopts a layout combining continuous roller conveyance, circular rotary stations and transfer‑based diverting, enabling mixed‑model production of multiple cabinet specifications. Inspection data is integrated into the manufacturing system to provide full‑process traceability for individual units.

1. Main types and application scenarios of conveying systems

In automated refrigerator production lines, multiple types of conveying systems are derived according to the needs of different processes, and each type plays an irreplaceable role in specific links.
a. Belt conveying system: Basic and common, consisting of a continuously running belt, suitable for conveying parts or semi-finished products with light weight and regular appearance. It runs smoothly, has low noise, low cost, and is easy to maintain. It is suitable for single-door and mini refrigerators. Initial production.
b. Chain conveying system: Strong carrying capacity, suitable for conveying heavy refrigerator boxes or finished products. The running speed can be adjusted as needed. It can be accurately connected with the front and rear processes to meet the conveying needs of double-door refrigerators after foaming.
c. Hanging track conveying system: The track is installed above and conveyed through hanging clamps or trays. The hanging track conveying system can accurately convey different types of door bodies to the corresponding refrigerator boxes on the assembly line through precise positioning control. Especially suitable for multi-door refrigerator doors, which can ensure installation accuracy.

2. The help of automated assembly lines to production

a. Ensure production continuity: Connect various processes to achieve continuous material transportation, avoid interruptions caused by manual handling, and lay the foundation for efficient operation.
b. Improve production efficiency: Shorten material transfer time, speed up production rhythm, and avoid pauses and delays caused by manual operations.
c. Adapt to flexible production: Through flexible design, we can quickly adapt to the production switching of different refrigerator models, reduce replacement time, and improve the level of flexibility.

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