Analysis on Successful Commissioning of Waste Refrigerator Dismantling Line From Technical And Process Perspectives

With the deepening of the global circular economy concept and increasingly stringent environmental protection regulations worldwide, the resource-based treatment of waste home appliances has become a core topic in the field of renewable resources. Due to the containing of fluorinated refrigerants, foaming agents and complex mixed structures of metals and plastics inside waste refrigerators, their efficient and environmentally friendly dismantling has long been recognized as a difficult technical challenge within the industry. The customized waste refrigerator dismantling line ordered by overseas customers this time is another landmark project of Shandong Alva Machinery Group Co., Ltd. in the field of renewable resource equipment. It aims to provide customers with a complete set of solutions that meet international environmental protection standards and feature high automation and intelligent levels. The smooth completion of commissioning for this project not only marks the further improvement of Alva Machinery’s capabilities in the research, development and manufacturing of large-scale and complex renewable resource processing equipment, but also demonstrates the core competitiveness of high-end Chinese equipment manufacturing enterprises serving the global circular economy market.

The dismantling line adopts a modular design concept, integrating mature technologies and core equipment of Alva Machinery in conveying, crushing, sorting and environmental protection fields, forming a full-process system covering pre-treatment, in-depth dismantling, resource sorting and environmental protection treatment procedures.

In terms of the conveying and pre-treatment system, non-powered roller conveying platforms serve as the starting section of the entire production line, undertaking the temporary storage and buffer conveying of to-be-dismantled refrigerators. Relying on gravity and auxiliary manual operation to realize the stable flow of materials, they feature simple structure, stable operation and low maintenance costs, providing stable material supply for subsequent working procedures. Powered roller conveying platforms connect non-powered roller platforms with core dismantling equipment, realizing directional and uniform material conveying through motor drive. The conveying speed can be adjusted flexibly according to process requirements, ensuring the consistency and controllability of the overall production rhythm. For materials with heavy weight and irregular shapes generated during refrigerator dismantling, chain plate conveyors with high-strength chain plate structures are configured, which deliver excellent load-bearing capacity and impact resistance. These conveyors ensure stable material transportation between key processes such as crushing and sorting, and effectively avoid common problems including material jamming and falling off. Belt conveyors are mainly applied for conveying light materials and finished recycled materials. Through customized belt materials and structural optimization, they achieve efficient and stable material transmission while reducing material damage, laying a solid foundation for subsequent sorting operations.

The core dismantling and crushing system constitutes the key functional section of the entire production line. The compressor cutting machine is adopted as the first critical process in waste refrigerator dismantling, specially used for safely separating compressors from refrigerator cabinets. Equipped with special cutting tools and hydraulic driving systems, the equipment ensures stable cutting operation without spark generation during working, fully meeting explosion-proof and safety operation specifications. In view of the characteristics of fluorinated refrigerants and foaming agents inside refrigerators, dedicated refrigerant recovery equipment is deployed to extract, purify and store refrigerants in a closed working environment throughout the process. This operation mode completely prevents the leakage of greenhouse gases and complies with strict requirements of international environmental protection conventions on ozone layer protection. The double-shaft shredder performs primary coarse crushing on separated refrigerator cabinet structures. Two cutter shafts rotate in opposite directions to shear, tear and squeeze large cabinet materials into medium and small uniform materials, creating favorable basic conditions for further fine crushing and precise sorting in later stages. The equipment is equipped with overload protection and intelligent reverse rotation functions, which can effectively handle hard foreign mixed materials and guarantee continuous and stable long-term operation. On the basis of primary shredding, heavy-duty horizontal crushers conduct deep fine processing of materials. Through impact and grinding effects generated by high-speed rotating hammers and lining plates, materials are refined to the required particle size standards, realizing sufficient dissociation between metals, plastics, foams and other components. Special rotor dismantling equipment supports automatic removal and separation of internal rotor parts of compressors, accurately extracting high-value metal raw materials and improving the overall recovery rate and added value of resources.

The resource sorting and purification system realizes classified recovery of different components from mixed crushed materials. Drum magnetic separators use strong magnetic fields generated by permanent magnet drums to efficiently separate ferromagnetic metals such as steel plates and iron parts from mixed materials, ensuring high sorting efficiency and high purity of recovered ferrous metals. Eddy current sorting machines separate non-ferrous metals including copper and aluminum accurately based on the principle of electromagnetic induction, serving as essential core equipment for refined separation of high-value non-ferrous metals in the renewable resource industry. Professional stainless steel sorting equipment differentiates stainless steel from other non-ferrous metals and plastics according to differences in physical characteristics, achieving efficient purification of stainless steel components and further upgrading the refinement level of overall resource recovery. Air sorting equipment relies on density differences of various materials, separating light materials such as plastic foams and sponges from heavy materials including metals and hard plastics through airflow classification technology, providing pure raw materials for subsequent high-value recycling of plastics. Color sorting machines adopt optical recognition technology to classify plastic components with different colors and material properties, supporting targeted treatment such as plastic granulation regeneration. Vibrating screening machines classify crushed materials by particle size through multi-layer screen structures, matching materials with corresponding particle sizes to various sorting equipment and optimizing overall sorting efficiency and final processing effects.

The environmental protection auxiliary system guarantees standardized and environmentally compliant operation of the entire line. Pulse dust collectors adopt pulse jet ash cleaning technology to centrally collect and treat dust generated during dismantling, crushing and sorting processes. They ensure that the air quality on the production site meets occupational health and environmental protection emission standards, while preventing dust from affecting operating accuracy and service life of mechanical equipment. Polyurethane volume reduction equipment compresses foamed polyurethane light materials generated in dismantling links, greatly reducing overall material volume to facilitate centralized storage, transportation and follow-up deep resource utilization.

The waste refrigerator dismantling line follows the core process logic of safe separation first, physical crushing second and precise sorting last, forming a closed-loop and high-efficiency standardized processing flow. In the initial feeding and pre-treatment stage, waste refrigerators are delivered into the production line through combined conveying equipment. After preliminary manual inspection, compressors are cut and separated professionally, and synchronous closed refrigerant recovery operations are implemented to achieve zero leakage of harmful gases that damage the ecological environment. In the coarse crushing and fine crushing stage, separated refrigerator cabinets are transported to double-shaft shredders for primary size reduction, then sent to heavy-duty horizontal crushers for deep refining treatment to complete full dissociation of multi-component materials. In the multi-stage sorting and purification stage, crushed mixed materials are firstly graded by particle size through vibrating screens; ferromagnetic metals are separated by drum magnetic separators at first, then high-value non-ferrous metals and stainless steel are extracted sequentially by eddy current separators and stainless steel sorting machines. Light and heavy materials are classified by air sorting equipment, and plastic raw materials are finely identified and sorted by color sorting units. Finally, various recycled resources with high purity standards are obtained. All dust pollutants produced in each working procedure are collected uniformly by pulse dust removal systems, and foamed light materials are processed by volume reduction equipment for unified subsequent management. All finished materials are transported in a centralized manner through supporting conveying facilities for storage and outbound delivery.

In terms of quality control management, Alva Machinery has established a comprehensive whole-process quality control system covering all links. From component inspection and assembly accuracy control in the equipment manufacturing stage, to on-site installation adjustment and process parameter optimization in project implementation, as well as real-time data monitoring and early fault warning during commissioning operations, all equipment and processes are guaranteed to comply with design specifications and customized customer requirements. During the overall commissioning process, the professional technical team comprehensively verified the continuous operation stability, overall resource recovery efficiency, environmental protection emission compliance and other core indicators of the production line, and all detected performance indicators reached or exceeded the level of similar international production lines.

This dismantling solution delivers prominent comprehensive advantages and practical value for customers. The whole line features high automation and intelligent configuration, realizing unmanned operation in key core processes. It effectively reduces overall labor input and labor intensity of on-site operators, while improving continuous production efficiency and intrinsic safety level of daily operation. Strictly following international mainstream environmental protection access standards in design and manufacturing, the equipment realizes closed recovery of refrigerants and foaming agents, with dust and noise emission indicators fully meeting regulatory requirements of various regions around the world, helping overseas customers pass local environmental supervision audits smoothly. Adopting multi-level precise sorting technology layout, the line completes efficient separation and high-purity purification of various metals and plastic components, effectively improving resource recycling rate and economic added value of finished products, creating stable and sustainable economic benefits for project operation. All schemes are customized and optimized according to actual conditions of overseas customers, including on-site space layout limitations, raw material waste refrigerator characteristics, regional power supply conditions and daily operation and maintenance capabilities, ensuring high matching degree between the production line and actual application scenarios. Beyond equipment supply and scheme design, Alva Machinery provides full-life cycle comprehensive service support including early scheme demonstration, factory manufacturing supervision, on-site installation and commissioning, professional operator training and later long-term operation maintenance and technical upgrading, ensuring long-term stable and efficient operation of the customized dismantling system.

The smooth commissioning of this waste refrigerator dismantling project marks an important milestone of Alva Machinery in the renewable resource equipment industry. In the whole commissioning cycle, the production line maintained stable continuous operating status all the time, and all core performance indicators fulfilled unified design expectations, gaining high recognition and objective evaluation from overseas cooperative customers. It not only fully verifies the solid technical foundation and sophisticated manufacturing strength of Alva Machinery in researching and developing large-scale complex renewable resource processing equipment, but also lays a solid market foundation for the enterprise to further expand global overseas business layout.

In the future, Alva Machinery will continue to focus deeply on the segmented tracks of the renewable resource equipment industry, concentrate on key application scenarios such as waste household appliance disposal, scrapped automobile dismantling and industrial solid waste treatment. The enterprise will continuously increase investment in core technology research and development, promote upgrading iteration of mechanical equipment towards higher automation, intelligence and environmental protection standards, provide more high-quality targeted circular economy comprehensive solutions for global cooperative customers, and contribute professional strength to advancing the sustainable development goals of global resources and ecological environment protection.