Steel Plate Handling Expert: An In-Depth Analysis of Shandong Xingyuan Machinery's QL Type Electromagnetic Hanging Beam Double-Girder Overhead Crane

In industries such as steel metallurgy, ports and docks, shipyards, and large-scale warehousing, the handling of long materials such as steel plates, section steel, and coils is a high-frequency, high-difficulty operational task. When lifting long items, traditional hook cranes require multiple personnel to coordinate rigging, which is not only inefficient but can also easily cause material deformation or scratches. Drawing on nearly two decades of crane manufacturing experience and integrating advanced electromagnetic technology, Shandong Xingyuan Machinery Co., Ltd. (hereinafter referred to as "Xingyuan Machinery") has meticulously engineered the QL type electromagnetic hanging beam double-girder overhead crane. With "electromagnetic adhesion, instant lift on contact, and worry-free handling of long materials" as its core advantages, this product provides an efficient, safe, and economical specialized solution for the handling of long materials such as steel plates and section steel.

Product Definition: The "Dedicated Steel Plate Transporter" for Long Material Handling

The QL type electromagnetic hanging beam double-girder overhead crane is a long material handling device specifically designed by Xingyuan Machinery for industries such as steel processing, warehousing, and logistics. Based on the double-girder overhead crane, this model is equipped with an electromagnetic hanging beam as its load-handling device, using electromagnetic lifters to adhere to and lift long materials such as steel plates, section steel, coils, and billets.

Core Positioning:

In simple terms: if the QD type is the "all-purpose handler" and the QZ type is the "bulk material processing expert," then the QL type is the "dedicated steel plate transporter." When your materials are steel plates or section steel measuring several meters in length, the QL type is the most efficient and cost-effective choice.

Core Advantages: Four Highlights Forging a Powerful Steel Plate Handling Tool

Electromagnetic Adhesion: Instant Lift on Contact, Doubled Efficiency

The greatest technical breakthrough of the QL type crane lies in replacing the traditional hook with an electromagnetic lifter. The efficiency gains brought about by this transformation are revolutionary:

(1) No Manual Rigging Required—Operable by a Single Person

When lifting steel plates with a traditional hook crane, 2–3 workers are needed to coordinate wire rope rigging, hook attachment, and rope removal—operations that are time-consuming, labor-intensive, and pose safety risks. In contrast, the QL type crane employs electromagnetic lifters. The operator simply moves the lifter over the steel plate, energizes it to complete adhesion, and a single person can perform the entire process of "adhesion – lifting – discharge," reducing labor costs by over 50%.

(2) Surface-Contact Adhesion Protects Material Surfaces

The electromagnetic lifter adopts a "surface-contact" adhesion method, with the magnetic force evenly distributed across the entire lifter face, avoiding the material deformation and surface scratches caused by the "point-contact" lifting of traditional wire ropes. For vulnerable materials such as stainless steel plates and precision steel sheets, the material loss rate can be reduced from the traditional 3%–5% to below 0.5%.

(3) Power-Failure Magnet Retention System Provides Dual Safety Assurance

The QL type crane is equipped with a power-failure magnet retention system. Even in the event of an unexpected power outage, the electromagnetic lifter can maintain its adhesion force for a certain period, ensuring that the material does not suddenly fall. The control station is equipped with audible and visual alarm devices that monitor the working status of the electromagnetic system in real time.

Hanging Beam Design: An Ingenious Solution for Long Material Lifting

The core structural feature of the QL type lies in its electromagnetic hanging beam—a transverse lifting beam beneath which multiple electromagnetic lifters can be installed, thereby achieving stable lifting of long materials.

(1) Two Hanging Beam Orientations, Flexibly Adapting to Different Materials

This flexible design enables the QL type crane to meet the lifting requirements of long materials of different specifications and orientations.

(2) Cross-Beam Structure (Optional Rotation Function)

For working conditions requiring horizontal rotation of materials, Xingyuan Machinery can provide a rotating electromagnetic hanging beam configuration. The hanging beam adopts a cross-frame structure with a maximum rotation angle of up to ±180°, suitable for lifting steel plates, section steel, and other materials of varying specifications that require angle adjustment.

(3) Anti-Sway Performance

The hanging beam's cross-frame structural design provides a certain anti-sway capability. When lifting long materials at height, it effectively reduces material sway, enhancing lifting safety and positioning accuracy.

Structural Composition: Five Major Modules Working in Coordination

The QL type electromagnetic hanging beam overhead crane consists of five core components:

1. Box-Section Bridge Structure

Adopts a box-section double main girder structure, welded using automatic submerged arc welding, with welds subjected to 100% ultrasonic flaw detection.

The main girder features high rigidity and strong bending resistance, meeting the demands of heavy-duty long material lifting.

The main girder and end carriages are connected with high-strength bolts, ensuring smooth and reliable operation.

2. Bridge Traveling Mechanism

Utilizes a "three-in-one" drive unit (motor + reducer + brake).

Four-corner drive ensures smooth operation and good synchronization.

Optional variable frequency speed control enables soft starting and soft stopping.

3. Lifting Trolley

The trolley frame is of welded steel plate construction, compact and robust.

Hoisting mechanism: Single motor, dual reducer, dual drum arrangement in a dual lifting point configuration.

The trolley power supply uses an I-beam rail + cable conductor system for reliable operation.

4. Electromagnetic Hanging Beam and Lifters

Hanging beam orientation: Parallel to main girder / Perpendicular to main girder.

Multiple electromagnetic lifters are installed beneath the hanging beam (quantity determined by lifting capacity and material length).

A rotating hanging beam (±180° rotation) can be configured to accommodate materials of different specifications.

Equipped with a power-failure magnet retention system to ensure material safety during unexpected power outages.

5. Electrical Control System

Adopts a PLC programmable controller.

Electromagnetic lifter control system: Includes a rectifier control cabinet, power-failure magnet retention device, and audible and visual alarm devices.

Centralized cabin operation provides a wide field of view and flexible control.