Spring returns and all things revive; it is the time to strive. At the Shaanxi Coal Group mine, the main transport gateway of the ultra-large mining height working face is advancing rapidly at an average daily advance rate of over 40 meters, accompanied by the resounding pace of the excavation equipment. Through the unremitting efforts of CRCHI and Shaanxi Coal Group, the equipment's maximum daily advance rate has surged "full throttle" to 53 meters, marking the successful application of the world's first 40 m²-class ultra-large cross-section rapid excavation and anchoring complete equipment.

Main transport gateway of the ultra-large mining height working face at the Shaanxi Coal Group mine

The main transport gateway is 7.5 meters wide and 5.5 meters high, with a cross-section of 41 square meters. It is the main transport gateway of the country's first 10-meter ultra-large mining height working face, and its cross-sectional dimensions are the largest in China. Given the ultra-large span and ultra-large cross-section of this roadway, construction faced unprecedented challenges in surrounding rock control, support design, excavation technology, equipment adaptability, safety and efficiency, and intelligent unmanned construction. Leveraging its core competitive advantages of "construction method first, intelligence-led," CRCHI started with the deformation and failure mechanisms and stability control technology of ultra-large mining height coal roadways, innovatively researched the excavation-support-transport collaborative operation process for the gateway of the ultra-large mining height working face, and customized the world's first 40 m²-class ultra-large cross-section rapid excavation and anchoring complete equipment.

CRCHI's 40 m²-class ultra-large cross-section rapid excavation and anchoring complete equipment

The equipment is currently the intelligent rapid excavation and anchoring complete equipment with the largest operating range in the world. It pioneers a 7.5-meter ultra-wide single-helical spiral cutting pick plus spiral vane heavy-duty drum, with cutting power increased from 270 kW to 540 kW and cutting capacity reaching 30 tons per minute, enabling one-pass roadway cutting and formation. It establishes an integrated excavation and anchoring process of "synchronous excavation and anchoring, spatiotemporal coordination, and parallel operation." The equipment is equipped with 13 large-stroke multi-degree-of-freedom roof bolters of 3.6 m/2.6 m, enabling one-time positioning and zoned parallel operation, expanding the support range, improving support efficiency, and ensuring support quality. The complete machine is equipped with a high-efficiency, high-wear-resistance, and high-reliability conveying system, with a conveying capacity of 36 tons per minute.

Equipment in working state

In 2023, CRCHI will continue to adhere to the industry development approach of "taking construction method transformation as the牵引, taking core equipment as the pioneer, and moving from providing single products to providing overall solutions," continuously advance the research and development of high-end intelligent products, and contribute CRCHI's strength to the high-quality development of the coal industry.