Product Introduction
A double-hole and double-wedge top beam is a metal long beam-type support equipment used for roof support in mining, which employs a double-wedge locking structure and connects through two rows of connecting pins.
Product Specification
| Model | Number of roots per graft (root) | Allowable bending moment of beam body/(kN.m) | Minimum load per girder/kN | Allowable bending moment of the joint part/(kN.m) | Adjust the angle (not less than) | Height/mm | Other sizes/mm | weight | |||
| Up and down | around | Articulating section | Beam body H | Length (pin hole center distance) L | The beam body length L1 | ||||||
| DJB600/470 | 1--2 | 52.5 | 470 | 30 | 7° | 3° | 138 | 90 | 600 | 420 | 18.9 |
| DJB800/420 | 1--2 | 52.5 | 420 | 30 | 7° | 3° | 138 | 90 | 800 | 620 | 22.9 |
| DJB1000/300 | 1--2 | 52.5 | 300 | 30 | 7° | 3° | 138 | 90 | 1000 | 820 | 26.93 |
| DJB1200/300 | 1--2 | 52.5 | 300 | 30 | 7° | 3° | 138 | 90 | 1200 | 1020 | 30.95 |
| Model | Long beam cross-sectional size/mm | Overall quenched and tempered hardness/HB | Carrying capacity/HB | Cross-sectional factor/cm3 | weight | |||
| (Kg·m-1) | ||||||||
| Long | wide | high | WX | WY | ||||
| DFB4500/300 | 4500 | 100/83 | 90 | 300～350 | 300～400 | 68.66 | 46.55 | 92.7 |
| DFB4600/300 | 4600 | 100/83 | 90 | 300～350 | 300～400 | 68.66 | 46.55 | 94.8 |
| DFB4700/300 | 4700 | 100/83 | 90 | 300～350 | 300～400 | 68.66 | 46.55 | 96.8 |
| DFB4800/300 | 4800 | 100/83 | 90 | 300～350 | 300～400 | 68.66 | 46.55 | 98.9 |
| DFB4900/300 | 4900 | 100/83 | 90 | 300～350 | 300～400 | 68.66 | 46.55 | 100.9 |
| DFB5000/300 | 5000 | 100/83 | 90 | 300～350 | 300～400 | 68.66 | 46.55 | 103 |
Product Applications
Coal Mining Excavation: Works in conjunction with hydraulic props for constant resistance support of the mining face and tunnel roof.
Rooftop Collapse Control: Used for rapid reinforcement and structural locking in broken rock layers or areas prone to roof collapse.
Tunnel Underground Excavation: Provides metal rigid support for small-section tunnels or pipeline gallery construction.
Temporary Works: Used for emergency roof support and safety protection at underground construction sites.
Logistics and Delivery Services
1. Professional Packaging and Transportation
Rust Prevention: Pillar surfaces are coated with anti-rust oil; piston rods are wrapped in plastic film; and metal top beams are sprayed with anti-rust paint.
Anti-Collision Packaging: Single hydraulic props are packed in thickened cartons with wooden frames. Key components are filled with EPE (pearl cotton) or foam boards to prevent impact damage.
Securing Measures: Bulk orders are palletized and reinforced with strapping bands and steel wire ropes to ensure no shifting occurs during transit.
Clear Labeling: Each package is labeled in both Chinese and English with the product model, quantity, weight, and "Handle with Care" icons.
Moisture and Waterproofing: For export products, the outer layer is wrapped in waterproof cloth or stretch film to prevent moisture during sea freight.
2. Door-to-Door Delivery Service
International Logistics:
Sea Freight: Partnerships with COSCO, Maersk, and other shipping lines, covering major global ports.
Land Transport: Providing China-Europe Railway Express or road transport for neighboring regions such as Russia, Central Asia, and Southeast Asia.
Air Freight: International express (DHL, FedEx) or air cargo can be arranged for urgent orders.
Flexible Trade Terms: Support for various trade terms including FOB, CIF, and DDP.
Documentation Support: Assisting customers with full sets of export documents, including customs declaration, commodity inspection, Certificates of Origin, and packing lists.
Overseas Warehousing: Partnered storage points in key markets like Southeast Asia and the Middle East to shorten delivery cycles.
3. Delivery Lead Time Guarantee
International Customers:
Sea Freight: Southeast Asia 15-20 days; Middle East 25-30 days; Europe and USA 35-45 days.
Land Transport (Central Asia, Russia): 10-15 days.
Air Freight: 3-7 days (for urgent orders).
Expedited Service for Urgent Orders:
24-hour expedited production channel available.
Priority scheduling for workshop production and quality inspection.
Coordination of the fastest logistics routes to ensure delivery in the shortest possible time.
FAQ
Q: Where is your factory located?
Me: Our factory is in Boshan District, Zibo City, Shandong Province
Q: Are you a trading company or a factory?
Me: We are a factory, warmly welcome you to visit our factory
Q: What do you need for a detailed quotation?
Me: Please tell me the product model you need, the number of products, the requirements for the surface treatment of the product, etc.
Q: How about your technical level?
Me: We focus on the production of coal mine support products for many years, with rich experience in research and development, we are the first manufacturer in the country to obtain the safety standard of five-meter single hydraulic pillar, and Shandong University of Technology jointly develop intelligent mining equipment, at the same time in 2025 we also help Dongtai Group to develop the required six-meter single hydraulic pillar.
Q: Do you have a safety certificate for your products?
Me: Our products have a national certification safety certificate.
Q: How do you guarantee the quality of your products?
Me: Each of our products needs to be inspected for quality before leaving the factory, and our products are closely related to the lives of coal miners, so we strive to make the best product quality.
Q: Can you provide customization, modification drawings and other requirements?
Me: Of course, if you need, we will modify our products according to your requirements and the actual situation of the coal mine.
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