When the gear rotates, the melt is self-lubricated, and a groove is formed between the shaft and the bearing to introduce a melt from the melt inlet for forced lubrication. The coupling between the driving shaft and the outer cover hole is sealed by a packing material, and the material is made of high temperature resistant polytetrafluorohexene (in which graphite powder is added to improve lubricating performance). Most of the parts and materials are made of tool steel with good red hardness and small deformation. Heat treatment hardness should be above HRC55 to improve strength and service life. The strength of the flat key is calculated, and it can protect the gear when the gear pump runs unexpectedly.
The gear is the core part of the gear pump, which is one of the difficulties due to its high precision. The 8-hole of the middle plate has high requirements for dimensional tolerance and shape tolerance. The mutual position requirements of the two holes are also very high. Especially when the nominal flow of the pump is greater than 80cm3, the length-diameter ratio of the aluminum alloy ladder hole is large. Screw air compressors bring certain difficulties to the grinding work. Due to the complicated shape of the bearing, the outer circle and the hole and the both end faces have strict shape position requirements, which becomes a difficult point. Used for extruding films, sheets and profiles, the basic raw materials are polyester and nylon polymers.
The gear pump has the characteristics of smooth transmission and small pulsation, which can effectively isolate the mold and the fluctuation from the screw extruder, improve the stability of the extrusion size and the mechanical properties of the polymer to improve the product quality. The gear pump has a small volume and a short melt residence time, which can lower the melting temperature to improve the melting quality. Gear pumps have higher volumetric efficiencies that increase throughput and reduce costs. The working strength of the screw extruder is reduced, and the service life of the screw extruder is prolonged.
Hammer head Tower Crane, also known as Topkit Tower Crane, is one quite economic type among three types of tower crane. They are especially reliable for precise and accurate handling of a wide variety of heavy materials. The minimum model of our Hammer head Tower Crane is 5T Hammer head Tower Crane. Available BQ models of tower crane include GHT5013-5(MC85), GHT5516-6(MC110), GHT6011-6, GHT6014-8, GHT5023-10, GHT6015-10, GHT6024-10, GHT7032-12(K30/30), etc.
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