Low clearance electric hoist is a lifting equipment designed specifically for space limited environments, and its material selection needs to take into account strength, wear resistance, corrosion resistance, and lightweight. The following is a technical analysis of its core components and main materials:

1. Core components and material system

a. Electric motor (power source)

Shell: Aluminum alloy (such as 5083-H111) or cast steel (such as GGG40), surface treated with anodizing to resist corrosion.

Coil: Copper alloy wire (high conductivity), some high-efficiency motors use permanent magnet materials (neodymium iron boron) to enhance power density.

Bearing: High carbon chromium bearing steel (GCr15), with a hardness of HRC62 after heat treatment, ensuring long service life.

b. Gearbox (torque transmission)

Gear: Alloy steel (20CrMnTi), with a surface hardness of HRC58-62 after carburizing and quenching. The tooth surface is polished to reduce noise.

Shaft: 42CrMo alloy steel, with both toughness and torsional strength after quenching and tempering treatment (HB280-320).

Lubricating oil: Synthetic gear oil (GL-5 grade), containing extreme pressure additives to adapt to high loads.

c. Drum and wire rope (load bearing)

Drum: High strength cast steel (GGG40), normalized treatment (HB170-210) to enhance toughness.

Steel wire rope: high carbon steel (65Mn), diameter 6.3-11.2mm, galvanized layer thickness ≥ 80 μ m, corrosion-resistant.

Fixed parts: 316L stainless steel bolts, with a pre tightening force of ≥ 70% and a yield strength to prevent loosening.

d. Shell and protective structure

Shell: made of stainless steel (304/316L) or aluminum alloy (6061-T6), with a thickness of 3-5mm and impact resistance.

Explosion proof design: Copper alloy (H62) joint, with nickel plating on the surface to prevent oxidation.

Coating: Epoxy resin powder coating, thickness 80-120 μ m, salt spray resistance ≥ 500h.

e. Braking system (safety critical)

Brake disc: made of cast iron (HT250) or alloy steel (42CrMo), with the friction surface quenched at high frequency (HRC45-50).

Friction pad: Semi metallic composite material (copper based powder metallurgy), friction coefficient μ ≥ 0.4, temperature resistance of 350 ℃.

Spring: 65Mn steel, with an elastic limit of ≥ 1800MPa after heat treatment.

2. Material selection logic

Lightweight: Aluminum alloy and magnesium alloy are used for non load bearing components (such as shells) to reduce overall weight.

Corrosion resistance: Stainless steel (316L) is used in humid environments, while galvanized steel wire ropes are suitable for marine climates.

Wear resistance: Alloy steel gears undergo carburizing treatment, resulting in a 30% increase in surface hardness and an extended lifespan.

Safety: The braking system adopts a redundant design, with a friction plate reserve thickness of ≥ 3mm.

3. Industry specific optimization

Explosion proof scenario:

Copper alloy (H62) replaces iron-based materials to prevent spark generation (ATEX certification requirements).

Static conductive coating: Surface resistance ≤ 10 ΩΩ to prevent static electricity accumulation.

High temperature environment:

Inconel 625 is used for sealing components and can withstand temperatures up to 900 ℃.

Ceramic bearings (Si3N4) replace steel bearings and are suitable for 400 ℃ working conditions.

4. Typical application scenarios

Modular design: The low clearance electric hoist is compressed to 60% of the height of traditional products, suitable for environments with workshop floors ≤ 4m.

Intelligent control: integrating frequency converter and PLC to achieve millimeter level positioning accuracy (± 2mm).

Green and energy-saving: The energy efficiency of permanent magnet synchronous motors is improved by 12% compared to traditional motors, and the no-load power consumption is reduced by 40%.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment