Overhead Travelling Crane with Hook (EOT Crane)

The overhead travelling crane (hereafter referred to simply as the crane) is an internationally standardized general-purpose overhead crane engineered and manufactured with European technology, complying with Europe’s FEM Crane Standards as well as China’s national standard GB/T 14405.

The crane mainly comprises the bridge frame, hoist trolley, long-travel driving system, electrical assemblies and operator cabin; operation modes include ground pendant control and remote radio control.

Its metal structure covers the bridge frame, trolley frame and all associated fittings. The bridge frame is assembled by connecting two main girders with two pairs of end carriages. Q235B steel is adopted as the standard structural material, and alternative materials can be customized to meet special working conditions.

Running rails for the trolley are laid on the top flange of the main girders. Part of the electrical equipment is arranged on the drive-side platform of the main girders, whilst the trolley current collector assembly is installed atop the conductive-side platform. A long-travel cable protection guard is fitted to avoid friction and contact between steel wire ropes and the power supply system.

1. The trolley assembly consists of a hoisting mechanism and a trolley travelling drive mechanism. The hoisting mechanism is installed on the trolley frame and equipped with an individual driving unit: the motor drives the gear reducer, and the low-speed output shaft of the reducer rotates the rope drum wound with steel wire ropes. By controlling the forward and reverse rotation of the motor, the lifting and lowering movement of the hook can be realized;

2. The trolley travelling drive system is available in both central drive and split drive configurations. After power is switched on, the brake opens, and the motor outputs power. Power is transmitted via the reducer to the travelling wheels, so that the trolley can travel back and forth. Once the power supply is cut off, the brake is applied immediately to halt trolley movement;

3. The long-travel driving system of the crane adopts a split drive arrangement, and its working principle is exactly the same as that of the trolley travelling drive mechanism.

Technical Parameters

Product Application

Steel & Chemical Industry

Applied for loading, unloading and outbound transportation of raw materials and finished products.

Power Plants

Utilized for component handling, transportation and installation of stators, rotors, plus routine equipment maintenance work.

Machinery Manufacturing Workshops

Suitable for hoisting and transferring various workpieces and goods.

Port Terminals

Deployed for hoisting and conveyance of bulk materials and containers.

Product Operation Guide

All crane operating motions are controlled via the operator cabin or control panel. Operators can control the hoisting mechanism, along with the start-up, braking, speed adjustment and forward/reverse running of the motors for both the trolley travelling mechanism and crane long-travelling mechanism.

The control panel is equipped with power indicator lights, emergency stop switches, start pushbuttons, stop pushbuttons, key switches and direction indicators; all directional movements are actuated by the matching directional buttons.

Prior to crane operation, operators must inspect the surrounding area to ensure no personnel or obstacles are present nearby.

Product Video

FAQ

1.Fault: Abnormally loud noise occurs while the electric motor is running

Root Causes:

1. Stator phase loss;

2. Loose clamping of the stator core;

3. Ball bearing wear;

4. Swelling deformation of slot wedges;

5. Stator voltage being excessively low or three-phase unbalanced;

6. Rotor circuit imbalance or rotor-side phase loss.

Troubleshooting Measures:

1. Inspect the stator wiring and restore correct connections;

2. Check the clamping tightness of the stator core; replace the whole motor if the core is deformed or stacked improperly;

3. Examine worn ball bearings and install new bearings as needed;

4. Trim protruding slot wedges and renew shrunken wedges;

5. Measure three-phase stator voltage, locate and troubleshoot low voltage or voltage imbalance faults;

6. Rotor circuit imbalance or rotor-side phase loss.

2.Fault: Hydraulic Thruster Fails to Actuate

Root Causes:

1. Open circuit in the power supply loop;

2. Stiff mechanical articulated joints (poor movability);

3. Insufficient hydraulic oil volume inside the cylinder;

4. Output thrust of the hydraulic thruster is less than the tension force of the brake spring.

Troubleshooting Measures:

1. Inspect the power circuit and all wiring connections;

2. Rectify faulty joint parts and apply lubricant thoroughly to improve flexibility;

3. Refill hydraulic oil up to the calibrated designated level;

4. Replace the unit with a hydraulic thruster of matching rated thrust.

3.Fault: Upon closing the knife switch or circuit breaker of the control circuit, the fuse blows or the circuit breaker trips immediately.

Root Causes:

Single-phase earthing fault occurs within the control circuit.

Troubleshooting Measures:

Carry out a full inspection of the control circuit and eliminate the earthing fault.

4.Fault: Limit switch malfunction;

Root Causes:

1. Improper adjustment position of the cam disc;

2. Poor contact or faulty opening/closing of electrical contacts;

3. Incorrect wiring connection.

Troubleshooting Measures:

1. Readjust the cam disc to the standard position;

2. Calibrate and repair the defective contacts;

3. Inspect the wiring and rectify wrong connections.