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(1) Before ventilating the air leg rock drill, the handle of the pressure regulating valve should be moved to the "O" position to prevent the air leg from elongating suddenly during the ventilation an

Matters needing attention in the maintenance and maintenance of air leg rock drills (1) Before using the new machine of the air leg rock drill, it is necessary to disassemble and clean the internal p

In the afternoon of March 28, Deputy Mayor of Jining Municipal People's Government, Secretary of the Party Committee and Director of the Municipal Public Security Bureau, Li Haiyang, Deputy Secretary-

On the morning of March 27th, many leaders of Jining Supply and Marketing Co. visited China Coal Group for a visit and inspection on the research and development of UAV production and the next coopera

According to the "Measures For The Evaluation Of Technology-based Small And Medium-sized Enterprises" (Guoke Fazheng [2017] No. 115).And the relevant provisions of the "Notice On Carrying Out The Eval

Hydraulic water well drilling rig is an efficient and multifunctional drilling equipment. Water well drilling rig is mainly suitable for drilling water wells, agricultural irrigation wells, ground sou