Marble mine size and length of service requirements: annual blocks greater than 10 000m 3, 30a over the service life; annual blocks 5 000 ~ 10 000m 3, the service life of 25 ~ 30a; annual blocks 3 000 ~ 5 000m 3 , service years 20 ~ 25a; less than 3 000m 3 , service years below 20a.
(1) Height of the step of the mining site The method of drilling or splitting or controlled blasting is adopted, the step height is 3~5m; the diamond bead saw is separated, the step height is 5~10m; the ordinary steel wire saw is separated, and the step height is 2~6m. The step slope angle is generally 90°.
(2) Working line length Fracture mining 15~60m; steel wire saw mining 20~80m; rock drilling controlled blasting method mining 60~120m.
The minimum working platform width is 20~25m.
(1) Height of the step of the mining site The method of drilling or splitting or controlled blasting is adopted, the step height is 3~5m; the diamond bead saw is separated, the step height is 5~10m; the ordinary steel wire saw is separated, and the step height is 2~6m. The step slope angle is generally 90°.
(2) Working line length Fracture mining 15~60m; steel wire saw mining 20~80m; rock drilling controlled blasting method mining 60~120m.
The minimum working platform width is 20~25m.
A hydrofoil is a lifting surface, or foil, that operates in water. It can be applied on the kireboard, surfboard and SUP.
They are similar in appearance and purpose to aerofoils used by aeroplanes. This surf hybrid (aluminium-carbon) foil is made to lift off as early as possible on a wave, an outside reef or soft wave. Its maneuverability and controlled accelerations provide good steering to remain in the right section of the wave when surfing.
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Huizhou City Melors Plastic Products Co., Limited , https://www.melorsmat.com