LH 10t Electric Hoist Double Girder Overhead Crane

An LH 10t Electric Hoist Double Girder Overhead Crane is a cost-effective, compact heavy-duty lifting solution engineered for general manufacturing workshops, machinery assembly lines, automotive parts warehouses, and steel structure fabrication bays. Unlike traditional heavy open-winch (QD) cranes, the LH series utilizes a fixed wire rope electric hoist mounted on a specialized four-wheel double-rail trolley frame as its lifting mechanism.

This smart structural combination bridges the gap between single-girder cranes and heavy-duty winch cranes. By seating the hoist trolley between or atop two parallel welded box girders, the LH 10t crane maximizes vertical hook lift height within low-headroom buildings while delivering the superior load stability and wide span capability of a double-girder bridge.

Designed in strict compliance with JB/T 3695-2008 standards, the LH 10t Overhead Crane features a lightweight deadweight, low wheel load (max. 43 kN), and reduced energy consumption (total motor power of only 17.2 kW). It places significantly less structural stress on your existing factory corbels and runway beams, making it the premier choice for plant upgrades and medium-duty M4 (A4) industrial operations.

Capacity: 10 ton (Full LH series range: 3.2t – 63t)

Span length: 7.5m – 31.5m (Drawing benchmark: 15m)

Lifting height: 6m – 24m (Drawing benchmark: 12m)

Work duty: ISO M4 / FEM 1Am (Class A4 Medium-Light Industrial Duty)

Rated voltage: 380V / 400V / 415V, 50Hz, 3-Phase AC (Customizable to local grid)

Work environment temperature: -20℃～+40℃, relative humidity ≤85%

Crane control mode: Ground Pendant control / Wireless Radio remote control (Optional Cabin)

Pictures & Components (De-duplicated & Professionally Rewritten)

1. Whole set crane

The LH 10t electric hoist double girder overhead crane integrates two symmetrical box girders, two rigid end carriages, a low-headroom electric hoist crab trolley, and a modular electrical control system. With an ultra-low clearance profile (only 841 mm above the runway rail), it fits effortlessly into standard industrial workshops with limited roof truss clearance, offering higher hook travel and better load anti-sway performance than single-girder monorail cranes.

2. Main girder

Manufactured from Q235B / Q355B structural steel plates, the twin main girders adopt a computer-analyzed box-beam or biased-rail box section. Internal stiffening ribs and automated submerged-arc longitudinal welds provide exceptional bending resistance. Trolley travel rails are pre-mounted along the top flange, accompanied by an inspection walkway and safety handrail along the drive girder side.

3. Lifting System

Instead of a bulky open winch, the lifting unit consists of a heavy-duty CD1/MD1 or European-style wire rope electric hoist rigidly bolted onto a compact 2,000 mm gauge trolley frame. Powered by a 13 kW conical rotor motor (ZD1 51-4/13kW), the hoist provides a steady lifting speed of 7 m/min (with optional 7/0.7 m/min dual-speed precision hoisting). The conical brake rotor ensures immediate, fail-safe mechanical braking the instant power is cut.

4. End Carriages

Fabricated from torsion-resistant rectangular steel tubing, the end carriages connect both main girders using high-strength tension bolts and reamed pins, ensuring effortless containerization and rapid bolt-together erection on site.

Each end truck houses double-flanged Ø250 mm forged steel wheels engineered to distribute a modest maximum wheel load of just 43 kN onto the runway rail.

Fitted with 35 mm stroke polyurethane energy-absorbing buffers and rail sweeps at both ends to prevent hard end-stop impacts.

5. Crane traveling mechanism

The bridge long-travel system adopts a maintenance-free "Three-in-One" (RQQII series) compact gearmotor drive (RQQII YSEP1.1kW×2). By combining the soft-start brake motor, hardened gear reducer, and electromagnetic disk brake into one sealed unit, the crane achieves a smooth 20 m/min travel speed without open gear oil leaks or complex shaft couplings.

6. Trolley traversing mechanism

The hoist crab traverses across the 2m trolley track gauge powered by dual compact gearmotors (RQQII YSEP0.5kW×2).

Operating at 20 m/min, the dual-motor drive guarantees balanced traction across the bridge rails, preventing trolley crabbing even under eccentric loads.

Protected by 35 mm stroke polyurethane buffers and electrical cross-travel limit switches at both span ends.

7. Crane wheel

Both the bridge and trolley utilize standardized Ø250 mm forged alloy steel wheels (45# steel or 42CrMo), reducing spare parts inventory complexity for the buyer's maintenance team.

Wheel treads undergo high-frequency induction hardening (HB 300–350) to eliminate premature wear and rail gnawing.

Pre-lubricated sealed deep-groove/spherical roller bearings ensure quiet, low-friction rolling.

8. Crane hook

Equipped with a drop-forged DG20 alloy steel single hook assembly with a 10-ton safe working load. Suspended from a multi-sheave fully enclosed pulley block, the hook rotates 360° smoothly on a heavy thrust bearing and includes a heavy-duty spring safety latch to lock rigging slings in place.

9. Motor

Hoisting motor: ZD1 51-4/13kW conical rotor braking motor with high starting torque and built-in mechanical fan braking, eliminating the need for external brake coils.

Travel motors: YSEP series soft-start electromagnetic braking motors (2×1.1 kW for crane travel, 2×0.5 kW for trolley travel), keeping the total installed crane power down to an energy-saving 17.2 kW.

10. Sound and light alarm system & limit switch

Includes an integrated audible-visual warning siren activated during bridge travel to alert ground personnel. The electric hoist is fitted with a guide-rope stopper limit switch (fire-break limit switch) and an upper/lower rotary limit switch to prevent hook over-winding or rope slackening.

11. Safety Devices

Digital load limiter: Prevents lifting loads exceeding 105% of the 10-ton rated capacity, featuring a clear LED weight display on the bridge or pendant.

Dual travel limit switches: Photoelectric or lever switches halt bridge and trolley travel smoothly before buffer contact.

Polyurethane buffers (50 mm projection, 35 mm stroke): Absorb kinetic energy at runway ends.

Electrical protection suite: Main isolating switch, emergency stop button, short-circuit, phase-sequence, and under-voltage protection inside an IP54 control panel.

12. Control Mode

Wireless Radio Remote Control: Ergonomic industrial push-button transmitter allowing the operator to control all motions from a safe, unobstructed vantage point on the shop floor.

Independent Festoon Pendant Control: Ergonomic push-button pendant sliding along a dedicated C-track cable system, independent of the hoist trolley.

13. Sketch

(Dimensional Layout Reference based on Drawing LH10t-15m A4)

Span ($S$): 15,000 ± 3.5 mm

Trolley Track Gauge ($K$): 2,000 mm (2 m)

Hook Approach Clearances: Left hook approach = 1,280 mm; Right hook approach = 1,270 mm

Height Above Rail: Only 841 mm (Top safety clearance: >200 mm)

Overall Crane Width: 5,016 mm (End carriage wheelbase: 3,976 mm)

Side Clearance: >100 mm (Rail center to end truck edge: 135 mm)

Main Technical Data (LH 10t-15m A4 Engineering Benchmark)

Advantages

30% Lower Capital Investment: Replaces expensive open-winch crab assemblies with a standardized, high-reliability wire rope hoist trolley, cutting initial procurement costs significantly while maintaining 10t double-girder performance.

Ultra-Low Headroom Profile: Requires only 841 mm of vertical space above the runway rail, maximizing usable hook lifting height inside low-ceiling workshops.

Low Wheel Load & Civil Savings: With a maximum crane wheel load of only 43 kN, it minimizes structural loads on factory columns and runway beams-ideal for retrofitting older workshops.

Energy-Saving Operation: Total combined power consumption is just 17.2 kW (compared to 35+ kW on traditional winch cranes), slashing daily electricity bills.

Universal Spare Parts: Uses identical Ø250 mm wheels for both bridge and trolley, alongside standard RQQII three-in-one gearmotors and ZD1 hoist motors that are effortless to source and maintain globally.

Container-Friendly Modular Design: Compact trolley dimensions and bolted end carriages fit easily into standard 40ft High Cube (40HQ) sea containers, saving thousands of dollars in ocean freight.

Application

General mechanical machining and equipment assembly workshops.

Injection molding and medium-sized stamping die handling bays.

Steel pipe, profile, and coil warehousing and logistics distribution centers.

Automotive parts fabrication and welding shops.

Prefabricated building components and stone/marble slab handling yards.

Power station auxiliary equipment maintenance rooms and water pump stations.

Crane Production Procedure

Design and engineering: Structural calculation and clearance modeling executed per JB/T 3695-2008 (Electric Hoist Overhead Cranes) and ISO standards.

Material procurement: Certified Q235B/Q355B steel plates and genuine brand electric hoists inspected before entering production.

CNC Cutting and shaping: CNC plasma/flame cutting of web plates with pre-camber profiles to ensure zero sag under 10t load.

Automated Welding: Box girders welded via automated submerged-arc machines and verified with non-destructive ultrasonic flaw detection.

Shot blasting and coating: Full girder shot-blasting to ISO Sa2.5 grade, coated with two layers of anti-rust primer and two layers of industrial polyurethane topcoat.

End carriage boring & assembly: Precision machining of Ø250 mm wheel bearing seats and installation of RQQII three-in-one drive motors.

Hoist trolley integration: Mounting the 10t electric hoist onto the 2m gauge double-girder trolley frame and aligning the wire rope reeving.

Electrical pre-wiring: Pre-installing the C-track festoon cables, limit switches, and Schneider/Chint electrical control cabinet.

Factory inspection and testing: Full dimensional check, no-load running test of hoist and travel drives, and protective plastic/wooden crating for export.

Workshop View

The company has installed an intelligent equipment management platform, and has installed 310 sets of handling and welding robots. After the completion of the plan, there will be more than 500 sets, and the equipment networking rate will reach 95%. 32 welding lines have been put into use, 50 are planned to be installed, and the automation rate of the entire product line has reached 85%.

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