At present, many foreign stone mines, especially granite mines, have adopted diamond beaded rope saws for mining waste materials, and in the sawing and processing of granite waste materials, have also promoted multi-line diamond beaded rope saws. However, many stone companies in China still use old-fashioned frame saws. It has a significant advantage is the sawing cost is low, but there are many disadvantages…
At present, China still has a lot of stone mine USES the method of shooting the behind to punch production stone block, not only the production efficiency is low and the operation is not safe, especially caused by detonation rock burst, serious damage to stone resources, produce block size rule, not even scrapped due to crack, yield is low.
1, stone mining technology and equipment
At present, China still has a lot of stone mine USES the method of shooting the behind to punch production stone block, not only the production efficiency is low and the operation is not safe, especially caused by detonation rock burst, serious damage to stone resources, produce block size rule, not even scrapped due to crack, yield is low. It is estimated that only 5 to 8 percent of the raw material produced by the perforation method can be processed into wood. In the early 1980s, some countries with developed stone industry had banned the use of explosive blasting to mine stone, and replaced it with diamond beaded rope saw and other advanced technologies. It can be said that this is a sign of the modernization of stone mining technology. And an important index to measure the modernization of stone mining technology is: the cubic meters of raw materials mined per capita per day. International office industry that China’s stone mining productivity is low. The reasons are lack of mechanized equipment, backward mining technology and poor production management. The e average annual exploitation of some stone mines is only a few hundred to a few thousand cubic meters, a few stone mines in the annual exploitation of more than 10,000 cubic meters, the annual per capita output of 6m3. At 0.5m3 per person per month, it is lower than India’s. As we all know, India is also a big stone producing country. But its granite mine scale is small, does not have the modern equipment, therefore the stone material raw material productivity is very low. Per capita per day is only 1m3. Finland is the largest stone exporter among Scandinavian countries. Its granite mine production system is world class, exporting granite at least 250,000 tons per year, the mine production efficiency is as high as 40m3 per capita per day. The productivity of stone mines in South Africa is at the medium level, 8-10m3 per capita per day.
2, stone processing machinery and equipment
Over the past decade, the development of Chinese stone machinery and equipment has made great progress. But China does not yet produce high-end technology and 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 still rely on manual operation, 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. Although most stone enterprises in Italy, a world stone power, use highly automated production lines, they still need some stone knowledge and experienced personnel to master the process parameters to produce top stone products.
At present, many foreign stone mines, especially granite mines, have adopted diamond beaded rope saws for mining waste materials, and in the sawing and processing of granite waste materials, have also promoted multi-line diamond beaded rope saws. 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:
Assembly cost is high, about four times as much as the diamond beaded rope saw;
More operators, at least two people need to operate. When replacing the saw blade, more people need to operate together;
Saw cutting speed is slow, the old frame saw saw cutting speed is only 2cm/h. The sawing speed of the new frame is only 3.5-3.8cm/h. The sawing speed of the diamond string saw is as high as 20cm/h, which may be increased to 30cm/h.
Influence of diamond saw blade on stone material
(4) the frame saw saw the surface of the plate is rough, planeness is also poor, so the polishing speed is low, 100cm/min, and the diamond beaded rope saw saw the surface of the plate is smooth, polishing speed can be up to 160cm/min, thus reducing the grinding and polishing processing time;
(5) energy consumption and material consumption are relatively high;
6 scrap steel mortar disposal and work site dust caused serious environmental pollution.
3, the quality of stone products
International stone industry personage thinks, Chinese stone material finished product quality is not high, because the stone material processing equipment that USES and craft method are backward than other country. Take producing granite facing brick as an example. Most of the granite blocks extracted from mines are irregular in shape and different in size. Sawing granite plate is generally used in the diameter of 1m and 1.6m diamond circular saw blade, saw blade quality is not high, sawing off the plate is usually polished and polished with rocker arm, processing for handicraft operation, that is to say, the use of higher degree of automation grinding and polishing machine, matching grinding head used abrasive poor quality; The polished sheet is cut into a certain size by common crosscut cutting machine. In the 1990s, many European countries have adopted advanced saw cutting machines and high-quality saw blades. The production of granite facing bricks is almost fully automated. The latest generation of sawing machine is equipped with as many as 80 to 1 m diameter of diamond circular saw blade, with high quality diamond, saw blades linear velocity can be up to 35 m/s, feeding speed of 17 m/min, each of the saw blade cutting at a rate of 1 m2 / h compared China with sawing machine is equipped with only commonly 5 to 1 m or 1.6 m diameter of the saw blade, diamond saw blades matrix and quality are poor, so saw blades linear velocity is restricted, for 17 m/s or 27 m/s, feeding speed is slow, to 5 m/min each saw blade cutting rate was about 0.3 m2 / h /.
