At present, there are still many stone mines in China that use the backward method of shooting and shooting to produce stone blocks. Not only is the production efficiency low and the operation is unsafe, especially the rock mass is broken due to knocking, and the stone resources are seriously damaged. The size of the blocks is irregular, even scrapped due to cracks, and the yield is very low. It is estimated that only 5% to 8% of the mined material can be processed into materials by means of eye-blasting. In the early 1980s, some stone industry developed countries have banned the use of explosive blasting methods to mine stone, and replaced it with advanced technologies such as diamond bead wire saws. It can be said that this is a sign of the modernization of stone mining technology. An important indicator for measuring the modernization level of stone mining technology is: the number of cubic meters of per capita mined material. People in the international hall believe that China's stone mines have low productivity due to lack of mechanized equipment, backward mining technology, and poor production management, which is lower than India. As we all know, India is also a big stone producing country, but its granite mine is small in scale and has no modern equipment. Therefore, the productivity of stone blocks is very low, and the daily average is only 1.0m3. Finland is the largest stone exporting country in Scandinavia. Its granite mine production system is world-class. The annual export of granite is at least 250,000 tons, and the mine production efficiency is as high as 40m3 per capita. The productivity of South African stone mines is moderate, with a daily average of 8-10 m3. Stone processing machinery and equipment In the past ten years, the development of China's stone machinery and equipment has made great progress, and some single-machine performance automation has reached the international advanced level. However, there is currently no production in China for high-end technical equipment. In terms of the degree of automation of the overall production line of stone enterprises, there is still a gap compared with foreign countries. Some production links are still operated by manpower, which not only affects the production efficiency, but also causes unstable factors in the quality of finished products due to the low quality of employees. Even if most of the world's stone power companies in Italy use high-automatic production lines, they still need a certain amount of knowledge and experience of the stone to master the process parameters of the process to produce the top stone products. At present, many stone mines abroad, especially granite mines, have used diamond bead wire saws to exploit blocks, and multi-line diamond bead wire saws have also been promoted in the sawing and processing of granite blocks. However, many stone companies in China still use old-fashioned frame saws. One of its significant advantages is the low cost of sawing, but there are many disadvantages: 1 high assembly cost, about four times that of diamond bead wire saw; 2 more operators, at least two people need to operate. More people need to work together when changing the saw blade; 3 The sawing speed is slow, and the sawing speed of the old frame saw is only 2cm/h. The sawing speed of the new frame is only 3.5-3.8cm/h. The sawing speed of the diamond bead wire saw is as high as 20cm/h, which may increase to 30cm/h. 4. The surface of the saw blade is rough and flat. It is also poor, so the polishing speed is low, 100cm/min, and the surface of the diamond bead wire saw saws the surface smoother, the polishing speed can be as high as 160cm/min, thus reducing the grinding and polishing processing time; 5 energy consumption and material consumption Both are relatively high; 6 the disposal of scrap mortar and the dust at the work site cause serious environmental pollution. The quality of finished stone products The international stone industry believes that the quality of Chinese stone products is not high because the stone processing equipment and process methods used are lagging behind other countries. Take the production of granite tiles as an example. Most of the granite blocks mined from the mines are irregular in shape and vary in size; sawing granite plates generally use diamond circular saw blades with a diameter of 1 m and 1.6 m. The saw blades are of low quality and are sawn down. The plate is usually polished and polished by a rocker arm. The processing is mostly manual operation, that is, the grinding machine with high degree of automation is used, and the abrasive used in the matching grinding head is of poor quality; the polished plate is cut with a common cross-cutting machine. A certain size, the production process is less automated. In the 1990s, many European countries have adopted advanced sawing machines and high quality saw blades. The production of granite facing tiles is almost fully automated. The latest generation of sawing machines are equipped with up to 80 diamond circular saw blades with a diameter of 1 m. Thanks to the high-quality diamond, the saw blade has a line speed of up to 35 m/s and a feed speed of 17 m/min. The sawing rate is 1m2/h. In contrast, the sawing machine used in China generally only has 5 saw blades with a diameter of 1m or 1.6m, and the saw blade base and diamond are of poor quality, so the saw blade The line speed is limited to 17m/s or 27m/s, and the feed rate is slow. The sawing rate of each saw blade is about 5m/min, which is about 0.3m2/h.
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