In recent years, driven by continuous social and technological advancement, numerous emerging industries—such as machinery, microelectronics, medical devices, food processing, bioengineering, laboratory equipment, the chemical industry, the nuclear industry, and optoelectronics—have experienced rapid growth. These industries impose stringent cleanliness requirements; accordingly, electric chain hoists used in such clean environments must also meet high cleanliness standards. The design of these electric chain hoists is tailored to their intended applications, fully satisfying diverse cleanliness requirements, minimizing production and cross-contamination, and facilitating operation, cleaning, maintenance, and routine upkeep to ensure compliance with cleanliness specifications. This paper presents the structural composition of electric chain hoists and the technical characteristics of their principal components.

Structural Composition and Technical Characteristics

It is primarily composed of a lifting mechanism, a working mechanism, structural components, and a power supply, among others.

1. Enhancement mechanism.

The lifting mechanism employs a specially treated, fixed-chain electric hoist. The lifting chain meshes smoothly with the drive sprocket and the passenger boat, with no abnormal noise. To meet the specific requirements of cleanrooms, the technical features are as follows:

1.1. Hook Assembly

The hook assembly features an aluminum alloy housing that encloses the sprocket, while the hook and anti-separation device are made of stainless steel to enhance wear resistance and corrosion protection.

1.2. Elevator Motor

Cylindrical-rotor, two-stage motor with IP55 protection; all electrical connections utilize standard aluminum-alloy plug-in connectors.

1.3. Elevator Gearbox

The lift motor drives the sprocket via a gearbox, with the gearbox’s lubricant ensuring proper meshing of the gears. The three-stage, high-precision hard-surface-ground gear drive delivers smooth operation and low noise. The aluminum alloy housing is lightweight, corrosion-resistant, and offers excellent heat dissipation.

1.4. Chain Link Box

The loop-chain box is made of stainless steel or high-impact, pressure-resistant nylon. Its excellent corrosion resistance significantly reduces particle fallout.

1.5. Treat the nickel-alloy chain or black chain and then cover it with a dust-proof cover. The dust-proof cover is made of three layers of waterproof fabric, which can be compressed to a very small size. This has minimal impact on the upper limit dimension while effectively preventing dust and oil from settling on the chain, thereby achieving the purpose of cleaning.

1.6. Other

All connecting rod bolts are stainless steel bolts.

2. Operating Organization.

The running mechanisms of both large and small vehicles comprise components such as wheelsets, drive units, and buffers, with the following technical characteristics:

2.1. Operation Control Panel Assembly

Using nylon or polyurethane wheelsets can significantly reduce dust and particulate matter generated by wheel–rail friction, thereby achieving cleaning objectives.

2.2. Operating the Drive

The drive unit employs a 3:1 reduction motor instead of a conventional open-type drive to prevent the generation and deposition of dust particles. The motor is a sterile-design unit, and by eliminating fan-based cooling, it avoids dust adhesion.

2.3. Buffer

The crane’s bumpers are made of polyurethane or elastomeric rubber, and the vehicle gears are fabricated from stainless steel to prevent particle generation during collisions.

3. Members of the Force Framework

The force frame is composed of main girders, end girders, sub-frames, and other components, with the following technical characteristics:

1.1 The structural materials shall be made of ordinary carbon steel, coated with an electrostatically dissipative spray coating, and equipped with electrostatic discharge devices. The connecting bolts shall be made of stainless steel.

1.2 The force frame and connecting bolts are both made of stainless steel.

This treatment method is relatively expensive to implement and is generally suitable for large-span cleaning workshops.

4. Heavy-vehicle operating track.

The tracks for large vehicles are all made of stainless steel, which enhances wear resistance and corrosion protection, significantly reducing dust particles generated by nylon wheels and friction.