JB/T 5318-2016 Wire Rope Electric Hoist Standard
JB/T 5318-2016 "Wire Rope Electric Hoists" is the product standard governing wire rope electric hoists. It specifies the type parameters, technical requirements, test methods, and inspection rules for CD1 and MD1 series wire rope electric hoists.
Product Classification and Technical Parameters
JB/T 5318-2016 covers CD1 single-speed hoists (8 m/min) and MD1 two-speed hoists (8/0.8 m/min). The rated lifting capacity ranges from 0.5 to 100 t, with lifting heights from 6 to 30 m. Mounting types include fixed and trolley-mounted configurations. The hoists are driven by a conical rotor motor (Class F insulation, IP54 protection) with an integrated brake. Brake clearance is set between 0.3 and 0.6 mm. The gearbox uses planetary gear transmission with ratios from 20:1 to 80:1; gears are made of 20CrMnTi steel, carburized and quenched to HRC 58–62. Single-stage transmission efficiency is ≥96%.
Key Component Technical Requirements
The drum is manufactured from HT250 grey cast iron or a Q345B (≈S355J2) welded structure. The wire rope is a non-rotating, galvanized type with a safety factor of ≥5. The electrical control cabinet provides protection rated at IP44 or higher, and the control voltage is safety extra-low voltage at 36/48 V. The standard requires that overall dimensions, mounting dimensions, and weight parameters for each hoist model comply with specified values. Power supply is delivered via C-type or H-type conductor rails. The hoist work duty classification ranges from M3 to M6, with M5 or higher recommended for frequent-duty applications.
Full Range
8/0.8 (Two-Speed)
Integrated Motor Brake
Three-Stage ≥88%
IP54 Protection
Selected by Duty Cycle
| Model | Lifting Capacity(t) | speed(m/min) | Power(k W) | Work Duty / Classification |
|---|---|---|---|---|
| CD1-05 | 0.5 | 8(0.8) | 0.8 | M3 |
| CD1-10 | 1 | 8(0.8) | 1.5 | M3 |
| CD1-20 | 2 | 8(0.8) | 3.0 | M4 |
| CD1-50 | 5 | 8(0.8) | 7.5 | M4 |
| CD1-100 | 10 | 7(0.7) | 13.0 | M5 |
Standards for cone rotor motors require both the stator and rotor cores to be conical in shape (taper 1:10 to 1:15). When energized, the magnetic flux generates an axial magnetic pull that overcomes the spring force, allowing the rotor to move axially while the brake disengages. When de-energized, the spring force pushes the rotor back and the brake engages. This integrated motor-and-brake design delivers a compact structure and is a defining feature of electric hoists. Brake clearance is typically 0.3–0.6 mm — too small a gap prevents full brake release and can lead to motor overheating and burnout, while too large a gap causes excessive braking stroke and load drop beyond allowable limits. After adjustment, both No-Load Test and Rated Load Test (100% SWL) brake tests must be performed for verification.
The gearbox uses planetary gear transmission with a transmission ratio ranging from 20:1 to 80:1. Gears are made of 20CrMnTi steel with Carburizing and Quenching, achieving a tooth surface hardness of HRC 58–62 and a carburized layer depth of 0.3–0.8 mm (determined by module). Machining accuracy is rated no lower than Grade 8 per GB/T 10095. Gearbox efficiency is ≥96% for a single stage and ≥88% for three stages. The gearbox uses Oil Bath Lubrication with L-CKD220 industrial gear oil. Noise level is ≤75 dB(A) with a temperature rise of ≤60 K. The drum is manufactured from HT250 grey cast iron or a Q345B (≈S355J2) welded structure. The machining accuracy of the Drum Groove directly affects wire rope spooling and service life.
Testing, Inspection and Maintenance
Routine tests include No-Load Test (at least 5 full strokes), Rated Load Test (100% SWL) with 3 lift/lower cycles and load drop ≤100 mm, a 1.25× static load test (10 minutes), and an insulation test (≥1 MΩ). Type tests are performed every 2 years and include damp-heat, vibration, and durability testing. Brake clearance must be inspected every 100 hours, wire rope every 500 hours, gear oil replaced every 1,000 hours, and the hook checked every 2,000 hours. A comprehensive safety inspection is required annually.
| inspection items | technical requirements | Method | Cycle |
|---|---|---|---|
| No-Load Test | Full Travel≥5Times | Visual Inspection+Auditory Inspection | factory |
| rated load | Lifting and Lowering3Times | load drop≤100mm | factory |
| Static load test | 1.25Times (Multiplier)×10min | Nonepermanent deformation | Annual |
| insulation test | ≥1MΩ | 500VMegohmmeter (Insulation Tester) | Semi-Annual |
Routine tests are performed unit by unit as required by the standard: a No-Load Test (at least 5 full hoisting/lowering cycles to verify smooth operation and brake response), a Rated Load Test at 100% SWL (3 lifting/lowering cycles with brake slip distance measured at ≤100 mm), a 1.25× static load test (held for 10 minutes to confirm no permanent deformation), and an insulation test (insulation resistance ≥1 MΩ). Type tests are conducted every 2 years and cover all routine test items plus damp-heat, vibration, and durability testing (service life ≥5,000 h). The durability test is a key means of assessing the long-term operational reliability of the electric hoist.
Recommended maintenance intervals per the standard: every 100 operating hours, inspect brake clearance and brake ring wear, and check the gearbox oil level. Every 500 operating hours, check the wire rope for wire breaks and lubrication condition. Every 1,000 operating hours, replace the gearbox lubricating oil — an initial oil change after the first 100 hours of use is required to remove metal particles generated during break-in. Every 2,000 operating hours, inspect the hook for wear and deformation. A full safety inspection is due once a year.
Electric Hoist FAQ: Selection, Testing & Maintenance
Q: What is the difference between the CD1 and MD1 electric hoists?
A: The CD1 is a single-speed hoist (lifting speed 8 m/min), while the MD1 is a two-speed unit (8/0.8 m/min). The two-speed option allows precise low-speed positioning during delicate lifting operations. The MD1 typically costs about 20–30% more than the CD1. Choose the configuration that best matches your lifting accuracy requirements.
Q: What should I consider when selecting an electric hoist?
A: Base your selection on the maximum load weight and required lifting height. Standard models cover 0.5–100 t with lifting heights from 6–30 m. Lifting speed decreases as capacity increases — approximately 8 m/min for a 5 t unit, 4.5 m/min for 16 t, and 3 m/min for 32 t. For work duty classification, choose M3 to M6 for standard applications; select M5 or higher for frequent-use scenarios.
Q: What tests are performed on electric hoists?
A: Routine factory tests include a no-load test (≥5 cycles), a rated load test with 3 lifting/lowering cycles (load drop ≤100 mm), and a 1.25× static load test held for 10 minutes. Type tests cover all routine items plus damp-heat, vibration, and durability testing (service life ≥5,000 h). A comprehensive safety inspection is conducted annually.
Q: How should I maintain my electric hoist?
A: Inspect brake clearance and brake ring wear every 100 hours. Check the wire rope for wire breaks and lubrication every 500 hours. Replace the gearbox lubricating oil every 1,000 hours. Inspect the hook for wear and deformation every 2,000 hours. Schedule a full safety inspection once a year. Kelude offers electric hoists in all standard models.
