(3) Internal stripping: the stripping of the part inside the ore body that cannot become blocks due to the existence of joints,dth drilling hammer, fissures and vein rocks. (4) Stripping ratio: refers to the ratio of the amount of earth and stone stripped to the volume of block mined. (5) Block rate: the ratio of the volume of blocks mined within a certain mining range to the volume of raw ore within the range is called the block rate. 2. Basic principle: simultaneous mining and stripping, stripping first 3. Requirements: The integrity and block formation of the ore body shall not be affected. Butterfly Green (XIII) II. Separation-the main process of stone mining 1. Concept: separate the strip-shaped block stone with a volume several times that of the block from the ore body. 2. Requirements: (1) Do not damage the ore body and ore-take protective measures (2) The specification size of the strip block stone shall be equal to the integral multiple of the specification size of the block plus the processing amount required for dividing the block. (3) According to the natural conditions of the ore body, make full use of natural fissures and bedding. (4) According to the technical performance of the mining equipment, give full play to the role of the equipment, improve efficiency and reduce costs. The width of the strip block stone is generally the height of the mining bench, and the length is a part of the mining bench. Three, top turn over-fall stone 1. Purpose:  Quarry stone: a cuboid or cube with certain specifications and no cracks, which can meet the processing requirements of decorative plates. Rough block: the shape basically meets the specification requirements of the block, but the surface is uneven, with a positive error of more than 3,dth rock bit, and the block stone needs to be shaped. Metering block: the actual metered volume of the block after inspection. It is the actual effective volume of the block after deducting the excess volume caused by the size deviation. Methods: Chiseling, splitting, sawing, mechanical drilling and cutting, controlled blasting. Five, plastic surgery 1. Purpose: Trim the rough blocks into blocks that meet the requirements of specifications, so as to reduce the redundant workload in hoisting, transportation and processing and reduce the cost.  Air compressor, oil supply system, oxygen supply system, flame thrower Operation Drawing of Downward Trench Excavation by Flame Cutting Machine IV. Advantages and disadvantages: High efficiency (1.5 ~ 2.5 ㎡/H), flexibility, large cutting depth (up to 10 m), large cutting area, smooth cutting surface, not affected by season and climate. High noise (100 ~ 120 db), high dust, high fuel consumption, high cost (200 ~ 250 yuan/㎡) and high labor intensity, so it must be combined with other mining methods. Flame cutting machine combined with hand-held rock drill,fastest dth hammer, drilling row holes combined with splitting mining method (referred to as burning rock drilling mining method) is the traditional, longest and most widely used granite mining method. Copyright notice If it involves copyright issues, please contact us to delete it! Return to Sohu to see more Responsible Editor:. wt-dthtools.com