The electric wire rope hoist manufacturing research and development direction
One, electric wire rope hoist series design rationalization. Recommended parameters: weight from 0.25 - 80t, lifting height 6-63m, covering the whole range of the base type less. The lifting speed variety recommended values: single speed 8m / min, 10m / rain, 12.5m / min; double speed 1 / 10, 1 / 3, 1 / 4 ratio change. Double speed program should take into consideration the composite machine, double winding and pole changing, or adopts frequency conversion stepless speed regulation technology. A reference to the design of GB3811 - 1983 "crane design standard" job classification, job level coverage will be expanded to M3-M6.
Structure two, electric wire rope hoist should be able to meet a variety of conditions such as: fixed mode low headroom, double hanging point etc; can be remote control, multiple functional, corrosion and moisture insulation, high temperature high fever, explosion-proof products.
Three design, electric wire rope hoist to change the traditional circular design, with a square structure, modular design, increasing the versatility of the parts, layout from the motor shaft of a reducer reel form, to layout motor reducer reel, is conducive to the effective increasing the lift height electric wire rope hoist, to avoid the high speed shaft axis transmission, can improve the smooth running and reliability, reduce manufacturing cost. Increase the pulleys magnification range, improve stand-alone use range.
Four, the high strength steel wire rope, according to GB3811 1983 standard requirements, in order to meet the safety coefficient of tensile strength, as far as possible to reduce the diameter of wire rope, and adapt to the roll diameter and the diameter of wire rope and pulley diameter and the wire rope diameter ratio, in order to reduce the whole structure and weight.
Five, optimization of gear design to improve the carrying capacity of gears. Gear can adopt 40Cr or 42CrMn, 40MnB material, quenching and tempering and surface hardening treatment and nitriding, originally used 20CrMnTi or 20MnTiB although the material in the gear bending strength and contact strength is ideal, but influenced by the processing level of domestic, gear machining precision is low, carburizing quenching heat treatment to control the amount of deformation, the order and no tooth grinding process, is the existence of gear noise, etc.. The new material and the heat treatment method has been used in many domestic manufacturers to promote. In addition, gears with hardened and hardened mating, high-speed gear shaving process, helical gear selection in 12~, these are the effective ways to improve the stability of the gear transmission. Gear transmission box, a box cover structure design should be conducive to absorption and vibration and noise, transmission bearing should improve the accuracy grade.
Six electric wire rope hoist motor, using 2, 4, 6 pole conical rotor motor for different operating conditions. Motor insulation should be improved to grade F and 11 grade, protection class up to IP54; the motor is arranged over temperature protection element; motor design should consider effectively improve the useful power, reducing ability and play, braking ability; improve the motor temperature rise, give full play to the potential of the electric motor; noise reduction of machine design, processing, except in to improve the manufacturing accuracy, but also from the design considerations to reduce eddy current electromagnetic noise and channel noise measures. Motor design should follow the principle of improving working level, single use.
Seven, increase the electrical protection measures, except the upper and lower limit protection, overload protection should be added (consider underrun protection individual cases); wrong phase, phase, voltage loss protection; hook anti loose rope protection. Development of multi braking function models such as: double brake (motor braking conical wheel brake and high speed shaft compensation; three brake (brake) tapered brake wheel brake + on the high speed shaft brake drum compensation + safety gate). According to user needs to increase lifting height, functional load digital display.
Eight, high wear resistance, high strength rope guide material and the rope guide rope guiding performance has been on many domestic production of electric hoist enterprise project, at present, China has mastered some successful experience.
Nine, other parts such as hook, such as car design should take into account the group and general.
Ten, improve the supporting parts such as quality of wire rope, bearings and other standard parts.
Eleven, improve the contactor, mechanical and electrical service life of transformer life of electronic components, electronic control box design should consider the coordination with the hoist of the plug body.
Twelve, pay attention to the paint appearance quality, packaging etc..