Analisando as perspectivas de desenvolvimento de equipamentos de extrusão plástica

In recent years, China's conventional extruders and production lines have gradually become popular in the global market due to their excellent cost-effectiveness. At the same time, China has innovated its extrusion technology services in the region and developed various new extrusion products. Fine extrusion molding can eliminate subsequent processing methods, effectively meet the requirements of product application, and achieve the goal of reducing material costs and improving product quality. Nowadays, to meet the demand for precise and direct extrusion of plastic products, various mature technologies have been introduced to the market, and polymer melt gear pumps are one of the important means. This technology has been widely applied in production lines such as chemical fibers, films, profiles, pipes, sheets, cables, composite extrusion, granulation, etc.

A China oferece soluções completas e econômicas da fabricação de hosts de extrusores ao fornecimento de linhas de produção completas . da perspectiva do host e de seus produtos plásticos, os extrusores que podem ser fabricados na China incluem extrusores de parafuso único, adequados para processamento de vários materiais e estruturas, como placas, flases, filmes, cabos, bastões, etc; A extrusora paralela de escala dupla rotativa e a extrusora de parafuso duplo rotativo é adequado para processamento de materiais sensíveis à temperatura, como folhas de PVC, tubos, perfis, etc; A extrusora paralela e rotativa para o parafuso duplo, adequado para mistura de matéria-prima, preenchimento, desolatilização, modificação e fabricação de materiais, com dispositivos de determinação adicionais, como bombas de fusão, podem ser usados ​​para moldagem direta; Extrusores de disco de moagem, extrusoras de parafusos alternativas, etc . adequadas para produção de material de enchimento alto . nos últimos anos, com a maturidade e o desenvolvimento contínuos de equipamentos auxiliares e tecnologia de mofo, as linhas de produção de extrusão se tornaram gradualmente a força principal no mercado extrusário chinês.}

Due to the continuous expansion of the application market and technological breakthroughs, the extruder market can still maintain a slight upward trend overall. However, the sharp decline in prices in the domestic extruder market is inevitable, and shoddy production and price wars have affected the overall image and market competitiveness of domestic plastic machines, as well as hindered the development of the plastic processing industry.

The market for extruder hosts and production lines will develop towards higher technological content and lower prices in the future. Currently, domestically produced main machines are mainly conical twin-screw extruders and single screw plastic extrusion equipment, with mature technology and large market sales. However, the general specifications of these products have exceeded demand and can only maintain about 50% to 60% of the market peak. The main focus of the host in the future is to develop parallel and opposite direction twin-screw extruders, which are suitable for large-scale extrusion molding. Parallel and co rotating twin-screw extruders should be developed towards the sixth and seventh generation, with a large aspect ratio. The development direction of single screw extruders is large diameter, large aspect ratio, and smooth exaustão .

The extrusion unit requires the driving motor to have variable speed, high starting torque, high low-speed torque, constant torque speed regulation, and stable speed. Especially in the production line, multiple motors need to be synchronized to determine product quality and normal production. In the past, most DC transmission and electromagnetic speed regulation technologies were used for control, but the brushes of DC motors need to be replaced once a month. In dusty or corrosive environments, DC motors need to be cleaned regularly, and sometimes clean cooling air needs to be introduced. Maintenance work is complex and the working rate is low. In recent years, AC frequency converters have been used, which are incomparable to previous speed regulation methods in terms of speed regulation position, dynamic response, intelligent control Fator de potência e taxa de trabalho . Eles agora foram reconhecidos .

The inner surface hardness of the barrel is better than that of the screw, and its damage occurs later than that of the screw. The scrapping of the barrel refers to the increase in inner diameter due to time wear and tear. Its repair method is to increase the diameter of the barrel due to wear and tear. If there is still a corresponding nitriding layer, the inner hole of the O barril pode ser perfurado diretamente, moído para um novo tamanho de diâmetro e, em seguida, um novo parafuso pode ser preparado de acordo com este diâmetro .

O diâmetro interno do cano é usinado, aparado e re -fundido com liga, com uma espessura entre 1-2 mm, e depois a precisão usinada com o tamanho desejado .} na seção geral, a seção de homogeneização do barril que se desgasta rapidamente .}.. liner. The inner hole diameter should refer to the screw diameter and be left in the normal fitting gap for processing and preparation. It should be emphasized here that the two important parts of the screw and the barrel, one is a slender threaded rod, and the other is a hole with a small and long diameter ratio. Their mechanical processing and heat treatment processes are relatively complexo, e é difícil determinar a precisão .