DS-ALB20T Adjustable Lifting Beam, Cross Telescopic Lifting Spreader Bar (New R&D Product)
- Dawson Group Ltd. - China Manufacturer, Supplier, Factory
WLL:20T
Various specifications can be customized
| Parameter | Technical Specifications | Remarks |
| Working Load Limit (WLL) | 20 Tons (20T) | Overloading is strictly prohibited |
| Safety Factor | 4 : 1 | Ultimate Breaking Load ≥ 80T |
| Primary Material | Q355B High-Strength Low-Alloy Structural Steel | Provides excellent low-temperature impact toughness and weld ability |
| Span Adjustment Range | 2500 mm to 5000 mm | Refers to the effective center-to-center distance between lifting points |
| Single-Side Step Distance | 125 mm | Precision incremental adjustment via locking pins |
| Maximum Unfolding Angle | 90° | Forms a standard symmetrical cross beam when fully unfolded |
| Upper / Positioning Shackles | 8.5T US-Standard Bow Shackle * 12 | Used for telescopic arm locking and top rigging attachment |
| Lower Main Lifting Shackles | 12T US-Standard Bow Shackle * 4 | Used for the main heavy-duty load points at both ends
|
Product Introduction
1. Product Overview
This 4-way cross telescopic lifting spreader beam is our newly self-developed lifting balance lifting tool. Adopting a modular 4-direction telescopic cross structure, it realizes synchronous and stable lifting for square/rectangular boxes, moulds, steel structural parts, container frames and other rectangular workpieces. It solves common industry pain points such as unbalanced load at single lifting point, uneven force distribution on multi-lifting points, and poor adaptability of fixed-size conventional spreader beams. It is a new dedicated balance lifting gear for equipment hoisting, mould handling, steel structure fabrication and warehousing logistics.
The whole beam is fabricated by welding high-strength box square tubes, with an integrated hinged rotating structure at the center. All four main beams can be telescopically adjusted independently for span width. Standard lifting lugs are installed at four ends, and multiple preset lifting eyelets on beam bodies allow flexible matching with wire ropes, shackles and lifting slings for outstanding universal compatibility.
This 20T Adjustable Multi-functional Lifting Beam, designed and manufactured by DAWSON. Incorporates international advanced modular and lightweight telescopic lifting beam design concepts (referencing the fast adjustment and multi-configuration architecture of Aluex flexible telescopic lifting beam systems).
It is specially engineered for modern industrial lifting and complex job sites. Constructed from high-strength structural steel, this device integrates dual functionalities: a "single-stage linear spreader beam" and a "90° four-way cross beam", offering high flexibility, rapid deployment, and exceptional transportation convenience.
2. Core Advantages
1.4-way Telescopic Adjustment for Multi-size Workpieces Segmented telescopic design for four beams with adjustable single-side length. One single spreader covers workpieces of various length & width dimensions, eliminating the need for multiple custom fixed-size beams and greatly cutting customers' costs on lifting gear procurement and storage.
2.Customizable WLL & Safety Factor Working Load Limit (WLL) and overall safety factor can be fully customized according to customers' on-site working conditions. The standard configuration safety factor is ≥5 times, and can be upgraded to 6~8 times for heavy-load or high-risk operations, fully complying with EN 13155:2020+A1:2025+AC:2026, EN 1993-1-1:2022, EN 13001-1:2015, GB/T 3811, GB 10055 and international lifting equipment safety standards.
3.Balanced Cross Force Distribution for Stable & Safe Lifting Symmetric 4-point lifting layout evenly distributes lifting load to four beams, preventing workpiece tilting and local overload stress. The central rotary joint allows minor angle fine-tuning to fit workpieces with offset lifting lugs and eliminate twisting risks during hoisting.
4.High-strength & Durable Construction for Long Service Life Main body welded from low-alloy high-strength square tubes, all critical load-bearing welds pass non-destructive testing. Surface treated with sandblasting anti-rust + epoxy zinc-rich anti-corrosion coating, resistant to workshop oil contamination and outdoor humid environment. Telescopic anti-drop locking structure, forged high-strength accessories for eyelets & lugs, excellent fatigue resistance and deformation resistance.
5.Modular Standard Parts for Easy Assembly & Disassembly Standardized modular lifting lugs, side lifting eyelets and telescopic locking components for simple disassembly and replacement. Optimized self-weight design reduces beam weight by 20% compared with fixed cross spreaders of identical load capacity; one operator can quickly adjust span with overhead crane assistance.
6.Original Independently Developed Structure Our self-designed new lifting gear, different from traditional single-beam or fixed cross spreaders. The telescopic mechanism and central rotary connection structure are independently researched and developed, verified by both finite element simulation and load failure test for stable and reliable mechanical performance.
3. Applicable Industries & Scenarios
1.Mould Manufacturing: Integral lifting of large plastic & die-casting mould frames
2.Steel Structure Engineering: Transfer & hoisting of rectangular steel frames and box components
3.Warehousing & Logistics: Batch lifting of standard square material bins and metal turnover boxes
4.Equipment Installation: Hoisting of square units, control cabinets and pressure vessel frames
5.Container & Box Components: Synchronous 4-point lifting of small box frames
4. Customization Support
1.Working Load Limit (WLL): Custom range from 1 ton to 50 tons
2.Safety Factor: Standard 5x, optional 6/7/8x high-safety grade
3.Telescopic Stroke: Custom extension range for four beams based on workpiece length & width
4.Optional Add-ons: Adjustable number of lifting eyelets, extended lifting lugs, anti-slip locks, high-temperature anti-corrosion coating, NDT inspection reports, third-party load test certificates, etc.
5. Safety Operation Instructions
1.Before lifting, ensure four beams are adjusted to symmetric lengths and locking mechanisms are fully engaged;
2.Never overload the spreader; actual lifting weight shall not exceed the marked WLL on nameplate;
3.Inspect welds, lifting eyelets and lugs for cracks, deformation or severe corrosion before every hoist;
4.Ensure even load bearing on four lifting points of workpiece; single-point or 3-point unilateral biased lifting is prohibited;
5.Conduct regular load re-testing and visual/NDT inspection to guarantee safe service.
6. Manufacturing Process & Quality Control
Welding Process: Continuous precision welding using Carbon Dioxide (CO2) gas shielded welding. The overall welding standards strictly execute GB50611-2011 "Code for Welding of Steel Structures" to guarantee weld penetration and fatigue strength.
Non-Destructive Testing (NDT): All primary load-bearing welds undergo rigorous Magnetic Particle
Testing (MT) or Ultrasonic Testing (UT). The internal and surface weld qualities fully comply with the JB/T6061-1992 "Non-destructive Testing - Magnetic Particle Testing of Welds" Medium Level Standard to eliminate any potential micro-cracks.
7. Dual Operating Modes & Working Principles
Breaking through the limitations of traditional single-function fixed lifting beams, this equipment features a Linear Spreader Beam Mode and a Four-Way Cross Beam Mode, adapting perfectly to different load geometries.
Mode 1: Retracted/Combined State — Linear Telescopic Spreader Beam
When the four main arms of the lifting beam are closed, aligned, and locked together, the assembly functions as a standard two-point linear spreader beam. This mode is designed for lifting long components, steel structure girders, shafts, and other elongated loads, eliminating the internal compressive stress generated by lifting lines on the load by adjusting the telescopic span.
Mode 2: Unfolded State — 90° Four-Way Cross Beam (X-Spreader)
When the lifting arms pivot around the central axis, they can unfold up to a maximum angle of 90° , creating a perfectly symmetrical cross structure. This configuration is ideal for high-volume or bulky loads (such as containers, modular buildings, vessels, prefabricated pump stations, and various heavy machinery with four-point configurations). It effectively prevents lifting slings from skewing and avoids excessive angles, achieving true four- point vertical lifting stability.
8. Telescopic Span Adjustment Guide
The adjustment range of the lifting beam span is 2500mm - 5000mm. The telescopic arm on each side utilizes a sleeve-in-sleeve mechanism paired with locating pins, with a standard incremental distance of 125mm per hole.
8.1 Adjustment Steps:
1.Place the lifting beam horizontally on a firm and level ground surface, ensuring it is completely free of any external suspended loads.
Remove the positioning US-standard shackles and safety linchpins from the telescopic sleeves.
2.Synchronously pull out or push in the inner telescopic arms on both sides according to the actual distance between the load's lifting points.
L_{total} = L_{base} + n imes 125 ext{mm} imes 2 (where n is the number of aligned single-side holes).
3.Ensure the extended length of the arms on both sides is perfectly identical so that the central lifting point aligns vertically with the load's center of gravity.
4.Accurately insert the positioning pins into the corresponding adjustment holes, reinstall and torque
down the 8.5T US-standard bow shackles, insert the safety retaining clips, and verify that the lock is absolutely secure.
9. Safety Regulations & Lifting Operations
Mandatory Safety Rules & Prohibited Actions
Strictly Prohibited Overloading: The maximum Working Load Limit is 20 tons. Under no circumstances should the combined weight of the load and rigging exceed 20T.
Strictly Prohibited Eccentric Loading: During lifting, ensure the center of gravity of the load is located directly beneath the vertical centerline of the lifting beam. Asymmetrical or single-sided loading where one arm is loose is strictly forbidden.
Angle Constraints: When used as a cross beam, the angles between the four arms must be accurately controlled, with the maximum unfolding angle strictly capped at 90° , and symmetrically locked.
9.1. Pre-Lifting Mandatory Inspection Items
Visual Inspection: Check primary structural components (Q355B steel) for visible deformation, twisting, severe denting, or large-scale paint peeling.
Weld Verification: Closely observe the welded joints, particularly around the sleeve transitions and the central pivot axis, ensuring no micro-cracks, weld disconnections, or severe corrosion are present.
Shackles and Rigging: Verify that all 12 pieces of 8.5T shackles and 4 pieces of 12T shackles are free of structural distortion, the pins engage smoothly with the threads, and there are no signs of thread stripping.
9.2. Lifting Operation Control
Trial Lifting Phase: The load must be stopped once it is lifted 100mm–200mm off the ground. Hold it suspended for at least 2 minutes to closely observe structural deflection, the equilibrium state of the load, and the reliability of the crane's braking system.
Smooth Travel: During lifting, lowering, and traveling operations, the crane operator must maintain smooth controls. Abrupt lifting, sudden braking, or severe swinging in mid-air are strictly prohibited to prevent dynamic shock loads from exceeding the structural safety threshold.
10. Safety Regulations & Lifting Operations
10.1 Daily Maintenance and Storage
Lubrication & Rust Prevention: Periodically apply an adequate amount of lubricating grease to the sliding contact surfaces of the inner/outer sleeves, the central pivot axis, and the internal walls of the adjustment holes to prevent wear and oxidation.
Storage Environment: When not in use, the lifting beam should be stored horizontally on dedicated racks in a dry, level indoor environment free from aggressive corrosive gases. Avoid prolonged outdoor exposure to rain or direct sunlight.
10.2 Mandatory Scrapping & Decommissioning Standards
The lifting beam must be immediately decommissioned and scrapped if it exhibits any of the following defects.
Repair by unauthorized welding is strictly prohibited:
Structural Deformation: The permanent plastic bending deformation of the main lifting beam components exceeds 2% of the total beam length.
Hole Wear: The adjustment pinholes or shackle attachment eyes exhibit plastic elongation/ enlargement exceeding 10% of their original nominal dimensions.
Crack Development: Non-Destructive Testing (NDT) reveals any cracks, laminations, or severe stress fatigue defects in the primary load-bearing welds or base metals that cannot be safely eliminated.
Section Reduction: The actual wall thickness of the structural sections is reduced by more than 10% compared to the original nominal thickness due to corrosion or wear.
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