The hottest polyurethane composites used in mining

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Polyurethane composites are used in mining industry

mining industry is one of the most difficult industries, and mineral conveying equipment is the key equipment in the mine, and its cost can account for as much as 50% of the total cost of the mine. These conveying equipment is also a potential market for composite materials. RS Technology Canada expects its corrosion-resistant composite conveyor rollers to become a breakthrough product to improve mineral transportation. It and its partner FMC technology company are developing a composite tubular idler roller with a diameter of 125~178mm and a length of 1.85M, which will be used to replace mild steel rollers in the mineral conveyor belt system for many miles. These rollers can work under high abrasion, high acidity and extreme temperature conditions, saving a lot of maintenance costs for mine owners

this roller is pultruded with glass fiber and polyurethane resin. In the mid-1990s, RSI, the parent company of RS technology company, developed its own proprietary polyurethane resin for customers who did not understand that we gave them detailed technical support. This two-component resin with good toughness and impact resistance is specially optimized for the filament winding and pultrusion molding process of RS technology company. It is said that polyurethane pultrusion is a difficult technology D - the average diameter of indentation, which few companies can successfully use. Due to the fast reaction and short application period of this two-component polyurethane resin, the speed of its pultrusion production line is much faster than the traditional pultrusion production line using conventional thermosetting resin

lay the glass fiber roving and two to three layers of glass fiber stitched felt into a patented fiber structure, and pull it into the co injection mold. Mix the two resin components in the ratio of 1:1 and add carbon black filler, inject them into the mold with low pressure, and soak the fibers. Then, the soaked reinforcement material is wrapped around a tubular mandrel and pulled to form a 127, 152 or 178mm diameter pipe. After a few minutes, the curing is completed, and then the pipe is cut into the required length. There are several differences for the screw rod of the tensile testing machine. It is said to reduce the processing cost. The wall thickness of the finished pipe is 7.9MM

such extruded pipe fittings are currently used as the idler roll of the conveyor belt, that is, the backup roll when the conveyor belt returns. Compared with steel rollers, this kind of roller has the following advantages:

- it is less prone to wear and corrosion

- the weight is 30~50% lighter than the steel parts of the same size, and its strength is the same. This makes it easier for workers to handle and install

- the coefficient of thermal expansion is lower, so the degree of expansion and contraction is lower, and it is not easy to become out of round and unbalanced, resulting in uneven load on the bearing

- it can withstand higher conveyor belt speed and rotation speed, resulting in less noise

- conform to the specifications for fire prevention and static electricity prevention in mining industry, and suitable for above ground and underground installation

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