Commonly used methods of pioneering transportation in limestone mines: first, road development, second, squad-automobile transportation, and third, squatting. The most used is road development, as the power consumption of the vehicle unit load decreases as the tonnage of the car increases. The world is competing to develop large-tonnage vehicles, and the tonnage of open-pit mine dump trucks is gradually increasing. TATRA148, 815 and BJ-374 are used more, the load capacity is 15-20t, and the new mines are mostly used in Beijing BJZ3480. The load capacity is 27t, Shanghai has a 35D load capacity of 32t, 3305B produced by the North Heavy Duty Automobile Manufacturing Plant, with a load capacity of 28 to 31t and a capacity of 3307 with a load capacity of 40 to 44t. The layout of the main road of the hillside open-pit mine is generally fixed road line. The main road from the surface to the top of the mountain is completed once. The single-wall road is excavated along the natural terrain. As the mining steps are lowered, the upper road trunk is gradually abandoned or disappear. In order to achieve the purpose of fixing the main road, it is required to arrange the main line outside the realm of the open pit, but not far from the realm. The hopper-automobile joint transportation development program, which is currently used less. Because the limestone mine is mostly a hillside open pit mine, the bucket is only used for lowering the ore. However, the transportation of materials, equipment and waste rock still needs to be built by the automobile transportation road. The dumping bridge and the road junction are equipped with a transfer trestle. The handling is complicated. The methods include Liuzhou Sun Village Limestone Mine, Yuexian Limestone Mine, Xiangxiang Limestone Mine, and Kunming Limestone Mine. The development of Pingyu slipping well can reduce the cost of ore transportation. The chute and chute have been widely used. The technical comparison between the static method and the road development is considered to be more than 100m (referring to the first mining level). It is more suitable for development. Later, because the slip hole is easy to block, it often causes some accidents, which interrupts the production, and the dust at the mine is also large. Considering the spare shaft and increasing the investment, some new mines are afraid to adopt it. With the advancement of technology, the well release ore is considered to be vibrating and releasing. For example, the heavy-duty vibrating ore concentrating machine under the main shaft of Beijing Fengshan Limestone Mine can put 1m large block, the production capacity is 500t/h, and the comprehensive measures for the ore discharge Dust-removing, transport in the flat-panel is changed to a belt conveyor (width 800 by electric vehicle (usually ZL-14/550 or ZL-20/750 electric vehicle traction 6.5m3 side dump truck or 9m3 side dump truck) ~1 000mm), which greatly improves production reliability and production capacity. The annual transportation capacity is 1.5-3.5 million tons, which has increased the interest of some cement mines in the development of Pingshuo. Because of the use of belt conveyors in the flats, the ore is required. The block size is reduced, so the crushing workshop is moved to the pit, such as the Huangshan limestone mine of Emei Cement Plant, the mine of Jiangxi Cement Plant, and the gate mine of Yongdeng Cement Plant. Now the crushing workshop has made progress, and the single-stage crusher with large crushing ratio is put into the pit, such as the limestone mine of Aiweigou in Xinjiang Cement Plant and the limestone mine of Shuangyang Cement Plant.
The crushing workshop is located in the cement plant or in the mine, which often affects the choice of developing transportation solutions. Many cement plants now set up crushing workshops in mines. From mines to cement plants, steel belt conveyors are currently used, such as Jidong, Luoyang, Shunchang, Yaoxian, Yongdeng and Datong Cement Plants. The advantages are large production capacity, good operational reliability, small maintenance, no fuel consumption and operating expenses, but the initial investment is slightly larger. The crushing stone transportation of the cement factory changed from the original motor vehicle transportation to the pipeline transportation (pipe diameter 350mm). Its characteristics can be closed transportation, curved transportation and large dip angle transportation. The advantages are low cost, small land occupation, less impact on climate change, transportation. It has the advantages of high speed, high lifting height and large production capacity. The seamless steel pipe for pipelines has a service life of 30~50a, which is suitable for mines with complex terrain.
Self-Aligning Idlers are used to assist with belts that are used to prevent the belt from off-track running. Self-Aligning Idlers pivot and attempt to guide the belt back into the center of the troughing Idlers . Self-Aligning Idlers can be troughing, return or flat carrying .
Self Aligning Idlers are placed onto the frame in bearings permitting their rotation and are equipped with control rollers on both sides. With tracking-off of the belt, the rollers swivel the complete set of conveyor rollers and put it to a camber position. This effect is additionally supported by the above-mentioned control rollers as they brake a conveyor roller with the help of a connecting rod.
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6200 Series - Light Series Ball Bearings – Balanced between space and load capacity
6300 Series - Medium Series Ball Bearings – Ideal for heavier load capacity applications
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