Steel Structure Lifting Tools are manufactured by Liweiyuan, a professional steel structure manufacturer in China. We use exquisite craftsmanship and high-quality raw materials. You can buy our products with confidence as we sell directly from the factory.
1. Lifting Tool Load Capacity
Based on the weight of the steel structure components (5-50 tons), the rated load of the lifting tool is determined to be no less than 60 tons, with a safety factor ≥ 3.5. The material used is Q355B low-alloy steel with a yield strength ≥ 345 MPa.
2. Structural Form
A double-lifting-point portal frame structure is used, with an adjustable main beam length of 11.5m. 80*80Q355B angle steel is used at the tool lifting nodes, with 16mm thick reinforcing ribs added at the nodes.
3. Connection Method
The lifting lugs are designed as a double-lug plate structure with a 50mm aperture and a 20mm thickness. Full penetration welding is used to the beam (weld grade 2), with a weld leg height ≥ 12mm.
1. Main Material Specifications
○ Crossbeam: H300×200×8×12 steel
○ Tool Hanging Node: 80*80 Q355B Angle Steel
○ Lifting Lug: Laser-cut from 20mm thick Q355B steel plate
2. Processing Technology
○ Cutting: CNC laser cutting, cut surface roughness Ra ≤ 25μm
○ Welding: CO₂ gas shielded welding, ER50-6 welding wire, post-weld heat preservation at 200°C for stress relief
○ Heat Treatment: Lifting lugs undergo quenching and tempering treatment (hardness HB 200-230)
1. Adjustable Crossbeam Mechanism
· The telescopic joint adopts a nested structure with an adjustment range of 500mm. It is equipped with three sets of locating pin holes (16mm diameter) and equipped with 45# steel locating pins (with anti-drop pins).
· The sliding contact surfaces are lubricated with MoS₂ grease, and the clearance is controlled within 0.5-1mm.
2. Lifting lug assembly
· 80mm spacing between lug plates, built-in Φ55mm needle roller bearing (model NA4911), bearing seat and lug interference fit (H7/R6)
· Pin made of 40CrNiMoA, 50mm diameter, chrome-plated (0.05mm thickness)
3. Non-slip support legs
· A 200×200×20mm rectangular support plate is installed at the bottom, with anti-slip teeth milled on the surface (teeth depth 2mm, spacing 5mm).
· The support leg height can be fine-tuned with an M42 adjustment bolt (adjustment range ±50mm).
1. Weld Inspection
All main welds undergo 100% penetrant testing (PT), and T-joints undergo 20% ultrasonic testing (UT), passing Level I.
Dimensional deviation of fillet weld legs ≤ ±1.5mm, straightness deviation ≤2mm/m.
2. Dimensional Tolerances
○ Beam full length deviation: ±3mm
○ Lifting point spacing deviation: ±2mm
○ Overall verticality: ≤1.5mm/m
3. Performance Testing
○ Rated load test: Static load of 1.25 times the rated load for 1 hour, permanent deformation ≤0.1%.
○ Dynamic load test: Cyclic load of 1.1 times the rated load for 50 seconds. 0 times (frequency 0.5Hz)
1. Overload protection device (model XZ-100, accuracy ±2%) installed, automatically shutting off the lifting circuit if overload exceeds 10%.
2. Sound and light alarm system (operating voltage DC24V) is installed, sounding an alarm when the bolt preload drops by 15%.
3. All exposed moving parts are equipped with protective mesh (mesh size ≤ 20mm), woven with Φ4mm cold-drawn steel wire.
1. Raw material inspection → CNC laser cutting → Machining (milling, drilling) → Welding → Post-weld heat treatment → Straightening → Assembly → Polishing → Surface treatment (sandblasting to Sa2.5 grade, epoxy zinc-rich primer 80μm + chlorinated rubber topcoat 60μm).
2. Key process control points: Welding deformation monitoring (using rigid fixing and reverse deformation method), bolt preload torque testing (according to GB/T 1231 specifications must be followed, with the torque coefficient controlled within 0.11-0.15.
1. Provide complete design drawings (including CAD 3D models), material warranty, and heat treatment report.
2. Third-party inspection report should include: mechanical property test records, non-destructive testing diagrams, and dimensional inspection reports.
3. Attach a User and Maintenance Manual (including a parts catalog, lubrication cycle chart, and common troubleshooting guide).
1. Before each use, inspect: the condition of the locating pins, weld cracks, bearing temperature rise (≤40°C), and alarm system effectiveness.
2. Overloading is strictly prohibited. The operating temperature range is -20°C to 60°C, and the maximum wind speed does not exceed 12 m/s.
3. Regular Maintenance: Perform a comprehensive inspection every 50 lifts or every three months, and perform a load calibration annually.
IX. Liweiyuan Steel Structure Design Quality
Liweiyuan Steel Structure is a leading manufacturer of various steel structure products and metal products in China. We can customize various metal product solutions and provide customers with high-quality, low-cost steel structure products and metal products. We can provide customers with materials and steel structure designs that comply with national and regional standards, including those from the US and Europe.
1. What happens if a product quality issue arises?
If we receive quality feedback, we promise to respond within 24 hours and provide a solution within 48 hours. If the issue is our fault, we can provide free rework, expedited reshipment (shipping costs covered by us), or compensation as per the contract, depending on the customer's needs.
2. How do we ensure consistent product quality? Do we have a comprehensive quality inspection process?
Our company is ISO9001-2016 certified and implements three levels of quality inspection: steel composition and strength testing before raw materials arrive; QC personnel conduct inspections and fully record each production process; and test data is fully archived for easy access by customers.
3. Do our steel structure products meet the entry standards of our target market?
Our Liweiyuan Steel Structure Lifting Tools are CE certified (EN1090 standard), ensuring compliance with EU safety, environmental protection, and energy efficiency requirements. Complete test reports are available.
4. What is the delivery time?
Delivery time depends on the size and number of buildings. Generally, delivery is within 30 days after receiving payment. Partial shipments are permitted for large orders.
5. Do you provide installation services?
We will provide you with detailed construction drawings and manuals to help you build and install the building step by step.
