A production process of elevator door hanging pulley

Abstract

The invention discloses a production process of an elevator door change gear. The production process includes: employing injection molding technology to prepare a metal hub first, conducting degreasing cleaning on the metal hub, performing pre-sandblasting treatment, then spraying a specially-made adhesive to a glue spraying surface of the hub, conducting drying and preheating, then subjecting a polyurethane material to injection moulding on the metal hub to form a tyre bead, then performing curing, adding a bearing and a central shaft so as to obtain the elevator door change gear finally. Theadhesive adopts polyurethane resin as the matrix, is added with a plasticizer, a diluents, a filling agent, a coupling agent, a stabilizer, a wear-resistant agent and an antioxidant, and in additionis added with beta-(3, 4-cyclohexene oxide)ethyltrimethoxysilane, bis(trimethylsilane)maleate, antimony isooctyl thioglycolate, 5-hydroxy-1-(4-hydroxy-3methoxyphenyl)-3-dodecanone, zinc chromate and magnesium oxide. In the elevator door change gear, the hub and polyurethane tyre bead have great bonding strength, and still can be used normally after 2000h of operation under a 200kg compressed condition, thus greatly meeting the needs of people's production and life.

Description

Technical field [0001] The present invention relates to the technical field of elevators, and more specifically to a production process of elevator door hanging wheels. Background technique [0002] At present, with the increase of high-rise buildings, elevators are used more and more widely. The elevator doors use hanging wheels to guide and carry the elevator door movement; traditional hanging wheels include a metal hub and a bearing located inside the hub, and there is a bearing outside the metal hub. Layer polyurethane bead. At present, the production process for preparing polyurethane rollers is mainly two kinds of injection process and casting process. Among them, the injection process is more favored by manufacturers because of its low cost of required mechanical equipment, simple injection process, and high production efficiency; but traditional The adhesive force between the bead and the wheel hub prepared by the injection molding process is poor, which cannot meet the n...

AI Technical Summary

Problems solved by technology

[0002] At present, with the increase of high-rise buildings, the use of elevators is becoming more and more extensive. The elevator doors use hanging wheels to guide and carry the movement of the elevator doors; the traditional hanging wheels include metal hubs and bearings located inside the hubs. There is a metal hub outside the metal hubs. Polyurethane bead, at present, the production process of preparing polyurethane roller is mainly injection molding process and pouring process. Among them, injection molding process is favored by manufacturers because of its low cost of mechanical equipment, simple injection molding procedure and high production efficiency; The bead and wheel prepared by the injection molding process have poor adhesion, which cannot meet the needs of use, and even cause the bead to break out and cause damage to the hanging wheel, which makes the elevator unable to operate normally and greatly affects the lives of high-rise residents.

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