Electric hoist is a special lifting equipment, installed on top of the overhead crane, gantry crane, electric hoist has a small size, light weight, simple operation, easy to use and other characteristics, used in industrial and mining enterprises, storage, docks and other places.
Electric hoist compact structure, motor axis perpendicular to the axis of the reel electric hoist using worm gear transmission device. Its disadvantages are: large length size, large size in terms of width, crude structure, low mechanical efficiency, more difficult to process, etc. The hydraulic system is double control, relief regulating valve, magnetic contact pressure gauge can be precise control of pressure. The electrical control department adopts low voltage control, which increases the safety of the dominant system.
The lifting weight is generally 0.3 to 80 tons, and the lifting height is 3 to 30 meters. Composed of electric motor, transmission mechanism and reel or sprocket, it is divided into two types of wire rope electric hoist and chain electric hoist. Among them, the electric chain hoist is divided into two kinds of imported and domestic; wire rope electric hoist is divided into single-speed lifting, two-speed lifting; miniature electric hoist, winch, multifunctional hoist.
Reducer, hoisting motor, running motor, fire breaker, cable slide, reel device, hook device, coupling, soft cable current introducer, etc. set power and braking force in one.
Lifting weight: 0.25t-80t
Lifting height: 3m-30m
Working level: M3, M4
Running speed: 20(30)m/min
Lifting speed: 8m/min
Installation and use
Electric hoist is generally installed on single girder cranes, overhead cranes, portal cranes and suspension cranes. With a little modification, it can also be used as a winch. Therefore, it is a necessary machine to improve labor efficiency and labor conditions.
Ambient temperature: -20℃～+40℃
Working system: Intermediate JC25%
Heavy grade: JC40%
When the lifting capacity of the electric hoist with intermediate working system is reduced by 30%, it is the electric hoist with heavy duty working system JC40%.
Heavy duty working system JC40% electric hoist is used in the case of heavier work, the load is often at the rated value or requires a higher safety factor.
Electric hoist structure reducer: three-stage fixed shaft helical gear rotation mechanism, gear and gear shaft made of heat-treated alloy steel, box, box cover made of high-quality cast iron, tightly assembled and well sealed. The reducer is a self-contained part, which is extremely convenient for loading and unloading.
Control box: Adopt the device that can cut off the main circuit in case of emergency, and with up and down travel protection fire-break limiter. Ensures the safe operation of the electric hoist. Electrical components have long life and reliable use.
Steel wire rope: lifting wire rope including phosphate coated wire rope, galvanized wire rope and stainless steel wire rope, the implementation of the current national standard GB8918-2006 important use wire rope, to ensure the durability.
Conical motor: lifting motor adopts larger starting torque conical rotor brake asynchronous motor, no need for additional brake. The motor load duration is 25%, the motor adopts class B or F insulation, and the motor protection grade is IP44/IP54.
Button switch: hand-operated light and convenient, divided into two ways: rope manipulation and wireless remote control.
The components of electric hoist are: motor, transmission mechanism, reel and sprocket.
The motor and reel can be roughly divided into four types, depending on the position of each other.
Electric hoist structure diagram
Electric hoist structure diagram
(1) motor axis perpendicular to the axis of the reel electric hoist using worm gear transmission, the width of the large size, heavy structure, low mechanical efficiency, processing difficulties, there are no manufacturers of this structure type of products.
(2) motor axis parallel to the axis of the reel electric hoist, the advantages of the height and length of small size. The disadvantage is the large width size, grouping, manufacturing and assembly complex, large turning radius of the track.
(3) electric hoist with motor installed inside the reel, the advantages of which are small length size and compact structure. Its main disadvantages are poor heat dissipation conditions of the motor, poor grouping, inspection, installation, maintenance motor inconvenience, complex power supply device.
(4) electric hoist with motor mounted outside the drum, the advantages of good grouping, high degree of generalization, easy to change the lifting height, easy installation and maintenance. Its disadvantage is the length of large size.