The most popular Changning second-hand cable recyc

2022-08-04
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Changning second-hand cable recycling manufacturers purchase in large quantities

Changning second-hand cable recycling manufacturers purchase in large quantities

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Changning second-hand cable recycling manufacturers purchase in large quantities. Shanghai xiufei Waste Recycling Co., Ltd. is an emerging enterprise dedicated to environmental protection. In the past few years, the company has established a good and stable business cooperation relationship with many enterprises and institutions in the Yangtze River Delta with good faith. Its performance has been expanding and has been highly praised by colleagues in the industry. We are willing to cooperate with IT enterprises, financial institutions, factories and mining enterprises, government agencies, hospitals, schools, hotels, office buildings The colleagues of scientific research institutes, enterprises and institutions work together to do a good job in recycling waste materials, environmental protection and reuse! Changning second-hand cable recycling quality standard is basically clear for imported waste paper, but there will be differences between the old and new standards in the market. For example, European waste mixed was labeled A2 in the old standard, but the label has been changed to 1.02 in the new standard. Although the old and new labels of some waste paper are slightly different, there is basically no ambiguity in the actual operation of the market

even if the standards are clear, the supply and quality of imported waste paper in the market are not invariable. Take American waste as an example. Besides the traditional 3\\\\\\\\\\. In terms of sources, in addition to the traditional three sources of the United States, Europe and Japan, in recent years, the sources of goods from Australia, Canada, Mexico, South Korea and other places have also occupied a certain share in the market

in addition, it should be noted that the quality of some traditional labels has also changed due to the change of overseas waste paper recycling mode. For example, the problem of the reduction of 8s waste paper content in the United States is quite common. However, the requirements of Chinese paper mills for different waste paper quality have also changed with the improvement of technology. Similarly, the large-scale paper mill has advanced technology and equipment, and has a high adaptability to the quality change of 8

basic introduction to second-hand cable recycling in Changning 1. Definition of waste steel: waste steel eliminated or damaged in the production and living process as recycled; It is a general term for ferrous metal waste in metal recycling, including scrap steel, scrap iron, metallurgical waste residue, oxidation waste, etc. Scrap steel has different shapes due to different production conditions, and its properties are basically the same as those of the finished products, but it is also affected by factors such as aging, effectiveness (rust generated by long-term accumulation), fatigue (element change of processed finished products with the increase of years), and its properties are reduced; The common understanding is: Steel Scrap (such as edge cutting, head cutting, etc.) that does not become a product in the production process of * * * * iron works, as well as steel materials in equipment and components that are scrapped after use. The components of steel are called scrap. Pig iron is called scrap iron, which is collectively referred to as scrap steel. At present, the total amount of scrap steel produced in the world every year is 300 ~ 400 million tons, accounting for about 50% of the total steel output, of which 90% is used as raw material for steelmaking, and 15% is used for casting, ironmaking and recycled steel. 2. Concept of scrap iron: the carbon content of scrap iron is generally greater than 2.0%. The sulfur content (mass fraction) and phosphorus content (mass fraction) of high-quality scrap iron shall not be greater than and 0.40% respectively. The sulfur content (mass fraction) and phosphorus content (mass fraction) of ordinary scrap and alloy scrap shall not be greater than 1.00% respectively. The iron content of blast furnace additive shall not be less than 65.0%. 2. Scrap: the carbon content of scrap is generally less than 2.0%, and the sulfur content is not more than 0.050%. The residual elements in non alloy scrap shall meet the following requirements: the mass fraction of nickel shall not be greater than 0.30%, the mass fraction of chromium shall not be greater than 0.30%, and the mass fraction of copper shall not be greater than 0.30%. Except for manganese and silicon, the total content (mass fraction) of other residual elements shall not be greater than 0.60%. 3. The concept of scrap steel: scrap steel is mainly generated from the uneven geographical distribution of China's scrap steel resources. More than 80% of the country's scrap steel resources are distributed in 12 provinces and cities with concentrated industrial and mining enterprises and dense population in Northeast China (Liaoning and Heilongjiang), North China (Beijing, Tianjin, Tang and Jin), East China (Jiangsu, Shanghai and Shandong), Hubei, Sichuan and Guangdong; In other regions, due to poor geographical conditions and small population, less than 20% of scrap resources are generated

Changning used cable recycling wire and cable products are mainly divided into five categories: (1) bare wire and bare conductor products. The main features of this category of products are:

pure conductor metal, without insulation and sheath layer, such as steel cored aluminum stranded wire, copper aluminum busbar, electric locomotive line, etc; The processing technology is mainly pressure processing, such as smelting, calendering, drawing, stranding/tight pressing stranding, etc; The products are mainly used in suburban, rural, user main line, switch cabinet, etc. (2) The main features of power cable products of this kind are: extruding (winding) the insulation layer outside the conductor, such as overhead insulated cable, or several cores stranded (corresponding to the phase line, zero line and ground wire of the power system), such as overhead insulated cable with more than two cores, or adding a sheath layer, such as plastic/rubber sheathed wire and cable. The main process technologies include drawing, stranding, insulation extrusion (wrapping), cabling, armoring, sheath extrusion, etc. different process combinations of various products are different. The product is mainly used for strong electric energy transmission in power generation, distribution, transmission, transformation and power supply lines, with large current (tens of amps to thousands of AMPS) and high voltage (220V to 500kV and above). (3) Wires and cables for electrical equipment the main features of these products are: a wide range of varieties and specifications, a wide range of applications, and the use voltage of 1kV and below. In the face of special occasions, new products are constantly derived, such as fire-resistant cables, flame-retardant cables, low smoke zero halogen/low smoke low halogen cables, anti termite, anti mouse cables, oil/cold/temperature/wear-resistant cables, medical/agricultural/mining cables, thin-wall wires, etc. (4) Communication cable and optical fiber (brief introduction) with the rapid development of the communication industry in the past 20 years, the products have also had an amazing development speed. From simple telegraph cables in the past to thousands of pairs of voice cables, coaxial cables, optical cables, data cables, and even combined communication cables. The structure size of this kind of products is usually small and uniform, and the manufacturing precision is high. (5) Electromagnetic wire (winding wire) is mainly used for various motors, instruments and meters. Wire and cable derivatives/new products wire and cable derivatives/new products are mainly produced by adopting new materials, special materials, changing product structure, improving process requirements, or combining different types of products due to different application occasions, application requirements, equipment convenience and equipment cost reduction. Different materials are used, such as flame retardant cables, low smoke zero halogen/low smoke low halogen cables, anti termite, anti mouse cables, oil/cold/temperature resistant cables, etc; Change the product structure, such as fire-resistant cable; Improve process requirements, such as medical cables; Combined products such as OPGW; It is convenient to install and reduce equipment costs, such as prefabricated branch cables

basic knowledge of second-hand cable recycling in Changning. Aluminum alloy cable technology and products have been introduced into China from 2006 to 2007 by American UMI alloy and Tianjin Shide alloy, and have experienced eight years of promotion and application. In particular, in the early stage, Alcan alloy cables imported from the Canadian Aluminum Corporation of the United States were promoted in China, and in the later stage, Tianjin Aluminum Corporation, which set up a factory in China to process and produce its own brand Shide alloy, invested a lot of manpower and material resources to develop the domestic aluminum alloy cable market, made a lot of aluminum alloy cable concepts and commercial publicity, and successfully opened up a market for the promotion of Shide alloy cables. Following Tianjin aluminum, some domestic manufacturers also imitated and learned from the publicity ideas of Tianjin aluminum, which jointly promoted the market's acceptance of the concept of aluminum alloy cable. The concept of positioned aluminum alloy cable is widely popularized. Among the numerous publicity, the introduction of new technologies, new materials, aluminum alloy cables with good application value, "substituting aluminum for copper" and promoting the process of building a resource-saving society are the mainstream of publicity, which has played a positive role in the popularization of aluminum alloy cables. However, there are also some misleading publicity that mislead the market. Generally, it is mainly due to the high hardness of bars that mislead users, which has buried hidden dangers for the healthy development of the aluminum alloy cable industry, resulting in objective facts that mislead users, leaving potential safety hazards when users apply aluminum alloy cable products. For eight years, the road of development has been difficult and bumpy. The aluminum alloy cable market has gradually matured, and the popularization of aluminum alloy cable products is the general trend

heating causes of second-hand cable recycling in Changning 1. The cable conductor resistance does not meet the requirements, resulting in heating of the cable during operation. 2. Improper cable selection results in too small conductor section of the cable used, resulting in overload during operation. After long-term use, the heating and heat dissipation of the cable are unbalanced, resulting in heating. 3. When the cables are installed, the arrangement is too dense, the ventilation and heat dissipation effect is not good, or the cables are too close to other heat sources, which affects the normal heat dissipation of the cables, and may also cause the heating phenomenon when the cables are selected from the door panel body or column trim panel during operation. And provide objective evidence. 4. Poor joint manufacturing technology and loose crimping result in excessive contact resistance at the joint and cable heating. 5. Poor interphase insulation performance of cables results in low insulation resistance and heating during operation. 6. The local sheath of armored cable is damaged, which will slowly damage the insulation performance after water inflow, resulting in the gradual reduction of insulation resistance and the heating phenomenon during cable operation

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