Wire Rope Electric Hoist Specs: ISO 23775:2020 Guide
ISO 23775:2020, "Technical Specifications for Electric Hoists," is the product standard for wire rope electric hoists. It defines the hoist classification (8 models with lifting capacities from 0.5 to 32 t), technical requirements (lifting speeds of 4–8 m/min for 0.5–5 t hoists and 1–4 m/min for 10–32 t hoists; conical rotor motors with self-braking torque ≥ 1.5×; 6×19/37 regular lay wire rope at 1770 N/mm²; drum D/d ≥ 20; IP54/55 protection), test methods (5-minute no-load run, 3 braking cycles at rated load with ≤ 100 mm drop, and 1.25× load for 10 minutes), and inspection rules to ensure safe and reliable operation.
Technical Requirements
Lifting capacities range from 0.5 to 32 t, with lifting speeds of 4–8 m/min for 0.5–5 t hoists and 1–4 m/min for 10–32 t hoists. The conical rotor motor provides automatic braking with torque ≥ 1.5×. Wire rope is 6×19/37 regular lay at 1770 N/mm², and the drum maintains D/d ≥ 20. Protection rating is IP54/55. Kelude manufactures hoists according to the standard.
Testing and Inspection
Factory tests include a 5-minute no-load run, 3 braking cycles at rated load with ≤ 100 mm drop, and a 10-minute test at 1.25× load. Type tests cover a 1.25× static load, 1.1× dynamic load, and noise levels ≤ 85 dB over 150 hours. Each hoist from Kelude comes with a Certificate of Conformity.
| Critical | Value |
|---|---|
| Lifting Capacity0.5~32t | Height3~30m |
| Motor Conical rotor | ≥1.5Times |
| Wire Rope6×19/37 | 1770N/mm² |
| D/d≥20 | IP54/55 |
| Item | Description |
|---|---|
| Standard | ISO |
| Inspection | factory+type test |
Wire rope electric hoists are among the most widely used lifting devices in industrial applications, and standardized manufacturing is essential to operational safety. The standard covers a rated load range of 0.5–32t, which accommodates the vast majority of industrial scenarios. Lifting speed is determined by the rated load and work duty classification, with heavy-duty hoists adopting slower speeds to ensure smooth starting and braking. The cone rotor motor is the core component of the electric hoist, and its braking performance is directly tied to safety—braking torque must be at least 1.5 times the rated load moment. The wire rope uses a regular lay 6×19 or 6×37 construction with a nominal tensile strength of 1770 N/mm², and the drum D/d ratio of ≥20 ensures the bending fatigue life of the rope. Protection rating is IP54 for indoor use and IP55 for outdoor use, with Class F insulation. Kelude manufactures wire rope electric hoists in accordance with ISO 23775, and every unit undergoes no-load, rated load, and 1.25× static load tests before leaving the factory, complete with a Certificate of Conformity.
Frequently Asked Questions
Q: What are the lifting capacity range and lifting speeds for wire rope electric hoists?
A: The lifting capacity ranges from 0.5 to 32t across 8 standard sizes. Lifting speed is determined by tonnage: 4–8 m/min for 0.5–5t hoists and 1–4 m/min for 10–32t units. Lifting height ranges from 3 to 30m, with custom options up to 60m. Work duty classification is M3 to M6. Protection rating is IP54 for indoor and IP55 for outdoor use, with Class F insulation.
Q: How does the cone rotor motor brake, and what are its key parameters?
A: The stator bore and rotor outer surface are conical with a 1:10 taper. When power is applied, magnetic attraction causes axial rotor displacement, disengaging the braking cone surface and allowing the motor to rotate. When power is cut, a spring pushes the rotor back against the braking cone to stop the motor. Braking torque is at least 1.5 times the rated load moment. Insulation is Class F, voltage is 380V at 50Hz, and duty classification is S3–S4.
Q: What routine tests are performed on electric hoists before delivery?
A: Each hoist undergoes a no-load run of at least 5 minutes with no abnormalities, three lifting/lowering cycles at rated load with brake slip distance ≤100mm, and a 1.25× static load test held for 10 minutes with no permanent deformation. Type tests are conducted every 2 years and include 1.25× static load, 1.1× dynamic load, noise measurement ≤85 dB(A), and a 150-hour endurance test. Kelude supplies a test certificate with every hoist.
Q: What manufacturing standard does Kelude follow for wire rope electric hoists?
A: Kelude manufactures wire rope electric hoists to ISO 23775:2020, with lifting capacities from 0.5 to 32t and lifting heights from 3 to 30m. The hoists feature a self-braking cone rotor motor, 6×19/37 regular lay wire rope with 1770 N/mm² tensile strength, and each unit passes three factory tests before shipping with a test certificate.
