Electric Hoist Gantry Crane Specs & Configurations
JB/T 5663-2008, the product standard for electric hoist gantry cranes, governs the design and manufacturing of these machines. The standard specifies types and basic parameters, technical requirements, safety devices, and test methods for electric hoist gantry cranes, and is applicable to gantry cranes that use an electric hoist as the hoisting mechanism.
JB/T 5663-2008 is the industry product standard for electric hoist gantry cranes, published and implemented in 2008. An electric hoist gantry crane — also referred to as a hoist gantry crane — uses an electric hoist as its hoisting mechanism. The main girder is supported by outriggers that travel on ground-level crane rails. Known for their lightweight structure, low cost, and ease of installation, these cranes are widely used in freight yards, open-air warehouses, factory storage areas, and transfer stations. The rated lifting capacity typically ranges from 1 to 20 t, with spans from 10 to 35 m and work duty classifications of A3 to A5. Kelude Heavy Industry manufactures electric hoist gantry cranes in accordance with this standard, featuring a box-section or truss-type main girder paired with a high-quality electric hoist. With a simple, lightweight design that requires no complex foundation work, this crane model is the preferred lifting equipment for open-air storage yards and basic material yards.
Types and Basic Parameters
The standard defines the basic types and parameters for electric hoist gantry cranes. Based on the main girder configuration, two types are specified: single main girder (applicable to ≤10 t with spans ≤25 m) and twin main girders (for >10 t with spans >25 m). The single-girder design offers a simple structure, low dead weight, and reduced cost, with the hoist running along the lower flange of the main girder. Twin main girders provide higher load-bearing capacity and greater stiffness, with the hoist traveling on a trolley frame between the two girder rails. Outrigger configurations are available in L-type and A-type designs — L-type outriggers occupy less space and offer better clearance but slightly lower stability, while A-type outriggers deliver superior stability at the expense of a larger footprint. Control options include ground-level pendant control, remote control, and operator cab operation.
The rated lifting capacity series comprises seven levels: 1 t, 2 t, 3 t, 5 t, 10 t, 16 t, and 20 t. Spans range from 10 m to 35 m, increasing in 3 m increments. Standard lifting heights are available in five levels: 6 m, 9 m, 12 m, 18 m, and 24 m. Lifting speed is typically 8/0.8 m/min (two-speed), with hoist travel speeds of 20–30 m/min and long-travel speeds of 20–40 m/min. The standard specifies that the work duty classification for electric hoist gantry cranes is generally A3 to A5, with A6 recommended for applications involving frequent duty cycles. Total machine weight is a key consideration for users — the standard includes reference weights for each specification in its appendix for selection reference. Compared to bridge cranes, gantry cranes typically use more crane bridge wheels — four wheels for small tonnages, eight for medium capacities, and twelve or more for large tonnage units.
Steel Structure and Mechanism Requirements
The standard sets forth technical requirements for the metal structure and mechanisms of electric hoist gantry cranes. The main girder is the critical structural component that supports the hoist and trolley — single main girders use a box section or H-beam, while twin main girders employ a box-section profile. After fabrication, the main girder must be pre-cambered to L/800–L/1000 of the span. The static deflection under full load must not exceed L/800 for single main girders or L/1000 for twin main girders. Outrigger-to-main-girder connections are made by welding or high-strength bolted connections. Stiffener plates must be provided at the joints between the outriggers and the bottom cross beam (base beam). Stress concentrations at the outrigger-to-main-girder connection points must be optimized through finite element analysis. All structural components are fabricated from Q235B or Q355B steel, and stress relief (via vibratory stress relief or heat treatment) is required after welding.
For the travel mechanism, the crane bridge travel on electric hoist gantry cranes generally uses a separately driven configuration — two drive motors, one on each side, power the wheel blocks beneath the outriggers. The drive motors are conical-rotor brake motors or variable frequency asynchronous motors, with the reducer being a shaft-mounted gearbox connected directly to the wheel axle. The crane bridge wheels are double-flanged cast steel wheels with a tread hardness of HB280–320. To prevent skewing of the crane bridge (rail gnawing), the standard recommends installing horizontal guide rollers at the outrigger base beams. The trolley travel mechanism is essentially the electric hoist itself, which travels along the lower flange of a single main girder or on the rails of twin main girders. Anti-wind safety devices are mandatory for outdoor electric hoist gantry cranes — manual rail clamps or electric rail clamps must reliably secure the crane under non-working conditions. Outdoor cranes must also be equipped with an anemometer that triggers an automatic alarm and cuts off the power supply when wind speeds exceed level 12.
Safety Devices & Electrical Requirements
The safety device configuration for electric hoist gantry cranes is largely consistent with that of general purpose bridge cranes, with additional protection requirements specific to outdoor service. Mandatory safety devices include: a lifting height limit switch (flameproof or counterweight type, with a minimum clearance of 200 mm between the hook and its upper travel limit), travel limit switches for both the crane bridge and trolley (trigger point set no less than 500 mm from the rail end stops), an overload limiter (pin-type or plate-ring sensor that triggers an alarm and cuts the hoisting circuit at 110% of rated load), emergency stop buttons (one each in the operator cab, pendant station, and remote control), and a wind rail clamp (manual or electric — mandatory for outdoor use). Outdoor electric hoist gantry cranes must also be equipped with an anemometer and rail end buffers.
Electrical system requirements: power supply is three-phase 380V/50Hz, with the control circuit operating at safety extra-low voltage (36V/42V). The control cabinet protection rating shall be no less than IP43 for indoor installations or IP54 for outdoor installations. Cables are YCW-type rubber-sheathed, routed along the main girder via cable trolleys. Grounding resistance shall not exceed 4Ω. Outdoor electrical equipment must be protected against rain and direct sunlight. A maintenance walkway with guardrails should be provided along the main girder for access to the hoist and electrical equipment — walkway width no less than 500 mm and guardrail height no less than 1050 mm. The standard also specifically requires that the crane bridge power supply for electric hoist gantry cranes use an enclosed conductor rail or cable reel system — bare copper conductor rails are prohibited to prevent electric shock hazards from accidental contact.
Test Methods & Factory Acceptance
The standard specifies factory acceptance test and site acceptance test requirements for electric hoist gantry cranes. Before delivery, each crane shall undergo a no-load test with all mechanisms operating continuously at rated speed for 30 minutes to verify operating stability and bearing temperature rise. The rated load test (100% SWL) involves lifting the rated load through a full cycle of hoisting, lowering, cross travel, and bridge travel while measuring main girder static deflection (single main girder ≤ L/800, twin main girders ≤ L/1000) and brake slip distance (≤ 80 mm). The dynamic load test lifts 1.1 times the rated load with each mechanism actuated no fewer than three times, checking structural components for abnormal deformation and weld seams for cracking. The static load test lifts 1.25 times the rated load and holds for 10 minutes, measuring permanent deformation — residual deformation after unloading shall not exceed L/2000. Outdoor electric hoist gantry cranes must also undergo no-load and rated-load clamping tests on the wind rail clamp before delivery.
Site acceptance testing is performed after installation and commissioning are complete. Acceptance items include: rail installation accuracy verification (track gauge, straightness, elevation difference, and joint condition), whole-crane grounding resistance measurement (≤ 4Ω), functional verification of all safety devices (limit switch trip positions, overload limiter alarm and cut-off points, emergency stop isolation range), and confirmation of mechanism travel directions and speeds. Upon successful completion, an acceptance report is issued containing all test data and conclusions — this document is mandatory for equipment handover and special equipment registration. During installation acceptance, the working condition of the crane bridge conductor rail or cable reel power supply must also be verified to ensure continuous and reliable power delivery. Kelude electric hoist gantry cranes undergo all test items unit by unit before delivery, with a complete test report provided.
Electric Hoist Gantry Crane Specification Comparison
The comparison table below lists the core parameters and configurations for electric hoist gantry cranes, for reference by selection and operation personnel.
| Lifting Capacity(t) | Span(m) | Lifting Height(m) | Work Duty / Classification | travel speed(m/min) |
|---|---|---|---|---|
| 1~5 | 7~20 | 6~12 | A3~A4 | 20~30 |
| 5~10 | 10~25 | 9~18 | A3~A5 | 20~30 |
| 10~16 | 12~30 | 12~24 | A4~A5 | 15~25 |
| 16~20 | 14~35 | 12~30 | A4~A5 | 15~25 |
FAQ: Hoist Gantry Crane vs. General-Purpose Gantry Crane
Q: What is the difference between a hoist gantry crane and a general-purpose gantry crane?
A: A hoist gantry crane uses an electric hoist as its hoisting mechanism, offering a simple structure and lower cost, making it applicable to light and medium lifting capacities (1–20 t). A general-purpose gantry crane uses a trolley hoist as its hoisting mechanism, providing a much higher load-bearing capacity (up to several hundred tons) at the expense of a more complex structure and higher cost. The two types differ in applicable tonnage and application scenarios.
Q: What are the requirements for the rail foundation of a hoist gantry crane?
A: The crane runway rails should be laid on a concrete foundation designed according to the crane's maximum wheel load. The rail gauge deviation must be ≤ ±5 mm, straightness ≤ 2 mm per 10 m, and the height difference across the same cross-section ≤ ±3 mm. Reliable limit stops and buffers must be installed at both ends of the rails.
Q: What precautions should be taken when using a hoist gantry crane outdoors?
A: Wind rail clamps must be fitted and engaged after working hours or during high winds. Electrical equipment requires waterproofing measures. The steel structure should be periodically inspected for corrosion and repainted as needed. In winds exceeding Force 12, the hoist should be parked in the designated position and secured against wind.
Q: How do I choose between a single main girder and twin main girders?
A: Choose a single main girder when the lifting capacity is ≤ 10 t, the span is ≤ 25 m, and space is limited. Opt for twin main girders when the lifting capacity exceeds 10 t, the span exceeds 25 m, or higher stiffness is required. Twin main girders offer better stability and rigidity than a single main girder but come with greater dead weight and higher cost.
