Tunnel drilling apparatus and method to remove drill waste
Реферат: A method provided with a working bit (1) for removing drill waste from drilling apparatus driving a tunnel in soil or rock, by means of which drill waste is conveyed by compressed air or water through openings (2) in the drill bit (1) and/or bit holder direct into the drilling apparatus protecting tubes (3, 7) which reach to the bit or bit holder and wherein a lap joint is provided between the protecting tube and the bit or the bit holder to prevent access of drill waste to the outside of the protecting tube.
Zdy4200ls crawler-type all-hydraulic tunnel drilling rig for coal mines
Номер патента: ZA202304285B. Автор: Yang Qin,XIN Jin,Kai Yang,Kai Zhao,Bin Jia,Yiyong Wang,Jinyi Feng,Yanze Yin,Tao Zang. Владелец: Shandong Fangda Eng Co Ltd. Дата публикации: 2023-10-25.