Special Magnetic Grab Overhead Crane (KMESMG)

Description×

The Special Magnetic Grab Overhead Crane (KMESMG) combines the capabilities of both a magnetic crane and a grab crane, enabling efficient handling of ferromagnetic materials as well as bulk, loose, and lump materials without the need for additional handling equipment. The crane is widely used in metallurgical, mining, and processing industries, foundries, charging yards, metal service centers, and scrap recycling facilities—where regular handling of scrap metal, pig iron, steel scrap, rolled metal products, as well as coal, ore, slag, sand, and other materials is required.

Depending on the process requirements, the crane may be equipped with an electromagnet, a grab, or both simultaneously. Various configurations are available for material-handling operations, including a single universal trolley designed to operate both the magnet and the grab, or two dedicated trolleys for specialized operation. In all configurations, each load-handling attachment is equipped with its own independent hoisting mechanism, allowing them to be operated separately.

Depending on the equipment configuration, the crane may also perform individual lifting operations in hook mode. The use of removable load-handling attachments does not alter the crane's intended purpose. The KMESMG is classified as a special-purpose crane because it is designed for specific technological processes and for handling designated types of materials, while the composition of the load-handling equipment is determined by the requirements of the production process.

For handling bulk materials, rope-operated grabs, suspended electromechanical grabs, or electro-hydraulic grabs are used. Depending on the material characteristics, two-rope and four-rope grabs may be employed, as well as multi-shell grab designs for large-sized and difficult-to-handle materials. The type of magnetic equipment is also selected individually: circular electromagnets are typically used for handling scrap metal and steel scrap, while rectangular electromagnets are used for transporting rolled steel products, rails, slabs, and other long materials.

The double-girder overhead crane structure provides the rigidity and stability required for heavy-duty operation. All major components are designed to withstand the high dynamic loads associated with handling scrap metal, charging materials, and other heavy loads.

The equipment can be operated both indoors and outdoors. Climatic version, operating temperature range, duty classification, and other technical parameters are determined during the design stage in accordance with the specific operating conditions of the facility.

Gruzopodyem Plant designs and manufactures Special Magnetic Grab Overhead Cranes in accordance with TU 28.22.14-020-87879481-2026, taking into account the technological requirements of the facility, the characteristics of the handled materials, and the required productivity. The reliability and quality of the manufactured products are ensured through a multi-stage quality control system that includes three accredited laboratories.

The warranty period is 12 months from the date of commissioning, but not more than 18 months from the date of manufacture, provided that the equipment is operated in accordance with the specified operating conditions and rated service requirements. When the crane is supplied together with installation services, the warranty period is extended to 24 months.

Specifications×

Scope of Supply×

Crane bridge for a double-girder crane with a suspended grab (may consist of 1, 2, or 3 sections depending on the span length) — 2 pcs. *
Bridge girders of a special grab crane with a fixed (non-removable) grab (may consist of 1, 2, or 3 sections depending on the span length) — 2 pcs. *
End carriages for a 4-wheel crane — 2 pcs.
End carriages for an 8-wheel crane — 4 pcs.
Crane control system — 1 set (may include multiple control cabinets, control stations, numerous sensors, etc., as well as a grab control cabinet, voltage converter, and UPS for the lifting electromagnet).
Crane travel geared motors:
- for a 4-wheel crane — 2 pcs.
- for an 8-wheel crane — 4 pcs.
Hoist trolley — 1 pc.
Trolley travel geared motor — 1 or 2 pcs.
Crane power supply system (if supplied with this option).
Cable festoon power supply system for the hoist trolley.
For special grab cranes, a safety device with a parameter recorder is included as standard.
Power supply system for the motorized grab – cable reel — 1 pc.
Power supply system for the lifting electromagnet – cable reel — 1 pc.
Maintenance walkway on each bridge girder of the special grab crane.
Other components (the list of components depends on the crane configuration and selected options and may differ from the information provided in this section of the website).
Crane documentation (passport/certificate, operation and installation manual, passports and manuals for individual assemblies manufactured by third-party suppliers and delivered with the crane, packing list, and shipping documents).

Grab and Magnet Equipment Configuration

Lifting electromagnet **, voltage converter (VC), UPS, and cable reel — 1 pc.
Grab (rope-operated, electromechanical, or electro-hydraulic) **, including a cable reel for motorized versions — 1 pc.
Four-rope two-shell grab ** — 1 pc.
For a two-shell four-rope grab: hoist trolley equipped with two hoisting winches arranged according to the conventional lifting scheme.

* Depending on the span length and transportation method. Using specialized low-bed trailers, bridge sections of virtually any length can be delivered as a single-piece assembly.

** The exact equipment configuration depends on the selected layout, type of load-handling attachment, and process requirements. The crane may be equipped with suspended or fixed load-handling devices, as well as various combinations of magnetic and grab lifting mechanisms.

List of Additional Options×

By default, cranes are manufactured in standard configuration. However, depending on their technical specifications and operating conditions, the factory manager may recommend enhancing the standard configuration with a set of additional options. Below is a brief description and rationale for their installation.

Option Name	Option Description
Load Limiter	Serves as an additional safety device alongside limit switches and the phase failure protection system. Typically installed when working with various loads of unknown weight. If the load exceeds the hoist’s rated capacity, the limiter blocks the lifting process. Available for cranes equipped with an electric hoist, as it is mounted on the hoisting mechanism.
Sound and Light Alarm	Activates when the bridge crane is turned on, warning staff to leave the hazardous area. Depending on site conditions, either sound or light alarms are recommended. Available only for electric bridge cranes.
Radio Control	Enables crane operation from a distance via remote control. Available for electric bridge cranes or cranes with electric hoists. Includes a 6-button remote with emergency stop, radio signal receiver (installed on the hoist, control panel, or next to it).
Motor with Brake for Crane Travel	Used to fix the electric bridge crane in a stationary position. Prevents unintentional movement caused by wind, seismic activity, etc.
Hoist Parking Shelter for Outdoor Use	For cranes in climate category U1 (outdoor), protects the electric hoist from direct precipitation. Recommended by crane and hoist manufacturers, as hoist designs typically lack built-in weather protection.
Full Span Hoist Shelter for Outdoor Use	For cranes in climate category U1 (outdoor), protects the electric hoist along the entire bridge span from direct precipitation. Also recommended due to lack of built-in weather protection.
Travel Limit Switch for Crane Movement Along Rails	Performs the same function as mechanical bumpers, but as a sensor that stops the crane upon contact, avoiding collision of metal parts. Available for electrically powered cranes. Includes 1 limit switch and mounting hardware.
Trolley Travel Limit Switches Along the Bridge	Prevent the hoist from reaching the end beams, reducing collision risks and prolonging hoist service life. Includes 2 switches and mounting hardware.
Obstacle Proximity Sensors	Prevent crane collision with obstacles or other cranes on shared runway tracks. Recommended: 2 sensors for bridge cranes, 4 for suspension cranes.
Phase Failure Load Protection	Additional safety device alongside load limiters and limit switches.
Crane Operation Data Recorder	Records operating conditions of the crane — modes, duration, and load levels. Available only for cranes with electric wire rope hoists.
Crane Runtime Indicator	Monitors crane operating time to ensure timely maintenance and repairs. Installed inside or on the control panel door.
Frequency Regulation of Crane Travel	Frequency inverter installed in the control panel allows for adjustable crane travel speed within a specified range.
Motor Cooling System	Recommended with frequency inverters that limit standard crane travel speeds to prevent motor overheating.
Input RL Filter	Required when the crane or hoist is powered by a conductor rail. Requires additional installation of a frequency inverter.
Heated Crane Control Panel	Allows operation at ambient temperatures down to -20°C. Mandatory for cranes used below -10°C. Requires a frequency inverter.
Anti-Sway System	Reduces load swinging during crane travel along the longitudinal or transverse axes.
LED Under-Crane Lighting	Provides an illuminated area beneath the crane span.
Wheel Alignment System	Increases wheel service life by reducing flange-to-rail head friction.
Centralized Lubrication System for Bearings	Reduces bearing wear by supplying lubricant.
Centralized Rail Flank Lubrication System	Reduces rail wear by lubricating the rail sides, eliminating dry friction between rails and wheel flanges. Prevents surface scoring.
Power Supply to the Crane	Provides power to the crane along the runway.