The new AFC system marks the 39th delivered to Chinese mines by and its predecessors in the longwall equipment line. The new AFC system is designed for longwall top coal caving (LTCC ...

Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height. ... An additional AFC is attached to the rear of the chocks and ...

The new AFC system marks the 39th delivered to Chinese mines by and its predecessors in the longwall equipment line. The system is designed for longwall top coal caving (LTCC) to mine a coal seam as thick as …

The models developed for the face coal extraction operations in a longwall top coal caving (LTCC) mine have a bi-directional cutting system and can be implemented in other operations readily. ... the excavated coal falls onto the AFC. The main task of the AFC in a longwall face is to transport the excavated coal to the beam stage loader (BSL ...

In the LTCC arrangement, the AFC system has one conveyor in front of the roof supports to move coal cut from the face and one conveyor behind the roof supports to move caved coal. The LTCC coal mining operation has a seam height of 6.32m on average, and the working face is approximately 250m. Production capacity is as much as 40,000t per day.

Motion Mechanisms for Top Coal and Gangue Blocks in Longwall Top Coal Caving (LTCC) with an… 5109 1 3 LTCC. The results show that LTCC can greatly improve the top coal recovery and reduce the amount of surface sub-sidence. Le et al. (2018, 2019, 2020) established a LTCC model by using UDEC, and analyzed the abutment pressure

equipment for a Longwall Top Coal Caving face. A brief description of longwall top coal caving (LTCC) is included at the end of the Longwall section of the Fundamentals of Coal Mining module of this web site.

Ellton Longwall has been supplying AFC and BSL Flight bars into the Australian Market since 2004, with in excess of 30,000 Flight bar assemblies installed since. We work with a range of supply options to best suit each customers needs, for …

On the basis of normal longwall system, Longwall Top Coal Caving (LTCC) method has been developed to extract thick coal seams of 5–12 m at one pass of the shearer (coal cutting machine). ... It is worth noting that, at a LTCC face, one additional AFC (normally referred as rear AFC) is equipped at the rear of chocks, allowing the transport of ...

Longwall Associates head and tail drives are unmatched in engineering prowess. Guaranteed to effectively and efficiently deliver coal to your stageloader while maximizing cutting speed and minimizing horsepower consumption, Longwall Associates head drives incorporate exclusive designs with the reliability you have come to expect from our company.

Longwall Top Coal Caving (LTCC) ... The AFC is moving into the picture Note the operator carrying a remote control for the shearer ; Double Ranging-Arm Drum Shearer DRDS for short Shearer rides on the AFC and is COG-DRIVEN (typically) as we saw on the prior slides. Cut coal can pass UNDER the shearer on the AFC RANGING ARMS move the cutter up ...

(Langfang) Mining Equipment Co. has produced its first full armored face conveyor (AFC) system for longwall mining - a "huge step" for the facility's evolution as a …

An extraction method for deep-seated thick seam deposits by underground mining with high resource recovery has remained a great challenge for Indian mining engineers, whereas the longwall top coal caving (LTCC) method has evolved as an effective method for various geo mining conditions in China and other counties. The percentage of top coal recovery (TCR) …

Single Pass Longwall has been considered to be a viable option for the range of seams in the 4.5m – 6m thickness category, but difficulties are often encountered due to …

By the early 1970s, French innovators succeeded in designing purpose-built fully mechanized systems for top coal caving with coal outlet in unsupported area in longwalls.

Automation improvement such as tail-end automatic chain tensioner greatly extends AFC chain's service life. Other incremental improvements including dust and methane controls, entry development, panel design and face move are addressed. ... is added. Also, a new chapter Longwall Top Coal Caving Mining (LTCC) is added due to its successful ...

Download scientific diagram | Shield supports in longwall mining from publication: Ground Control in China's Coal Mine: Progress and Prospects | China is the world's largest coal-producing country ...

mechanized longwall system. Longwall top coal caving (LTCC) is a part of longwall mining that is applicable for thick coal seams. China is an important country, which has best practices of LTCC in terms of high production rates. The production principle of LTCC is similar to the con-ventional longwall mining; however, there are two con-

A brief description of longwall top coal caving (LTCC) is included at the end of the Longwall section of the Fundamentals of Coal Mining module of this web site. Despite the fact that there are numerous coal seams in Australia which are …

Longwall Top Coal Caving (LTCC) is an enhanced form of the conventional longwall recovery system, whereby a rear Armoured Face Conveyor (AFC) (refer to Figure 3) is utilised to …

Also, a new chapter Longwall Top Coal Caving Mining (LTCC) is added due to its successful application in Australia since 2005. Longwall Mining, 3rd edition will be of interest to professionals and academics in the field of mining engineering specifically, serving both as a reference work and an (under)graduate textbook, but will also interest ...

Above Pic, A typical mining planning of longwall top coal caving method. Coal Seam Thickness 4.5-7 Meters; Phase 3rd 6.5-7 Meters. Depth of Coal 400-700 Meters; currently, the mining depth is 530 ...

supplying special shields for the longwall top coal caving method (LTCC), where extremely thick seams are being mined. This method utilizes a second AFC behind the shields to take the coal …

6. OPERATION OF LTCC • This method employs both cutting of the lower portion of the coal seam accompanied by caving and reclamation of top coal. • Coal is first cut from the long wall face using a conventional shearer …

As shown in Fig. 1, longwall top coal caving (LTCC) is a main and widely used technology to extract thick and extra-thick coal seams.Its basic procedural is that the bottom coal seam is mined by the conventional longwall mining; the top coal is broken into loose blocks under the mining-induced stress and other factors, and then drawn out from the support opening …

Using longwall top coal caving (LTCC) in an extra-thick seam, many problems appear, such as large broken top coal blocks, frequent arch formation in the drawing process, poor balance of drawing ...

3. 3 be drawn through the window of the shields aftercaving behind the supports in parallel with the process of longwall operations. The following Figure illustrates the principle of the LTCC method. Figure 1: Conceptual Model of LTCC System (after Xu, 2001) The LTCC method was first introduced in China in 1982, and then developed rapidly over the next two decades.

Using longwall top coal caving (LTCC) in an extra-thick seam, many problems appear, such as large broken top coal blocks, frequent arch formation in the drawing process, poor balance of drawing ...

LTCC systems are based on a conventional longwall system setup with roof supports, AFC, BSL for material handling and shearer as mining machine. The roof supports …

The new AFC system marks the 39th delivered to Chinese mines by and its predecessors in the longwall equipment line. The new AFC system is designed for longwall top coal caving (LTCC) to mine a coal seam as thick as 8 m. Face length will be 260 m. The LTCC mining method enables recovering thick seams economically by cutting the ...