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After summarizing the domestic and international research and development, structural design and assembly production process of the belt conveyor roller materials, and in accordance with the requirements of the "Technical conditions for the roller used in coal mines," to improve the safety of the belt conveyor roller running under the coal mine For the purpose of reliability and economy, the UHMW-PE modified flame-retardant and antistatically-modified pipes for coal mines have been developed and innovatively designed with a waterproof, dust-proof and low-resistance roller seal structure. Research and design are simple. Accurate idler interference cold assembly and production process.
Research on UHMW-PE Compound Modified Compounding Process and Single Screw Continuous Extrusion Process for Tube Production . UHMW-PE generally refers to a linear structure polyethylene with a viscosity average molecular weight of 1.5 million or more (average molecular weight of ordinary polyethylene is only 200,000 to 300,000). It is a linear structural thermoplastic engineering plastic with excellent comprehensive properties, with ordinary plastics and others. Engineering plastics have no comparable impact resistance, wear resistance, self-lubricating, chemical corrosion resistance, hygienic non-toxic, non-adherent, difficult to absorb water, low density, low coefficient of friction and other comprehensive performance, including wear resistance, impact resistance Properties such as properties, self-lubrication, chemical resistance, and impact energy absorption are the highest among existing plastics, but due to poor flame retardancy (lower limit oxygen index (LOI) of only 17.5, polyolefins with an oxygen index of less than 21 It belongs to flammable plastic and its volume resistivity is very high (1×1017 to 1×1018Ω·cm). Although it has excellent comprehensive performance, it cannot meet the requirements of mandatory safety technical indicators such as flame retardant and antistatic for coal mine materials; Due to its extremely high melt viscosity, it is difficult to achieve large-scale molding and processing. Therefore, it needs to be modified by flame-retardant, anti-static and easy processing to achieve its conformity with coal mining materials. Safety technical requirements, and to achieve large-scale processing and production. The flame-retardant, antistatic and easy-to-process compound modification of UHMW-PE was carried out using a halogen-free flame retardant antistatic modification method.
The flame retardants used are different from halogen-containing flame retardants and traditional halogen-free intumescent flame retardants, while nano-flame retardants are used to assist the flame retardation of phosphorus-based and silicon-oxygen-based flame retardants, and the nanoparticles can be fully dispersed. The carbonized layer plays a role of skeleton, so that the resulting carbonized layer has better rigidity and strength, plays a role in sealing the cracks in the nascent carbon, reduces carbon layer cracks and grooves, improves the quality of the carbon layer, and solves The halogen-containing flame retardant and the conventional halogen-free flame-retardant intumescent flame retardant are incompatible with the UHMW-PE matrix and easily precipitate on the surface of the pipe to block the extrusion die during extrusion molding.
Some manufacturers have effectively solved the problems of the roller's flame-retardant performance and electrostatic properties through research on materials, and passed the test verification of the alcohol torch burning test device and the roller antistatic tester, which is worth learning.
Article from the Technical Department of Qingdao Zhongbang Instrument Co., Ltd. 
Our company, Qingdao Zhongbang Instrument Co., Ltd., has recently conducted a follow-up visit to the new technology of the idler market, among which the major changes in the manufacturers focus on the use of the material of the idler tube body: the tube body cannot adapt to the coal mine underground dust, water spray, Corrosion, material adhesion and other harsh operating environments, roller seal can not significantly block the dust, water, water and corrosion of the bearings and grease damage, the assembly process of the idler due to lack of precision caused by the radial runout roller , axial turbulent momentum and rotation resistance are large. The above-mentioned technical defects significantly affect the life of the idler and the operation and maintenance cycle, reduce the safety, reliability and economic performance of the idler operation, thereby reducing the safety, reliability, and economy of the operation of the belt conveyor under the coal mine. Therefore, it is urgent for the belt conveyor idler to carry out theoretical research and process design technology development in many aspects such as material and material design technology structure design and assembly production.