Central rotary catch rock machine rules: Action. Face must focus and correct judgment grab bucket swing position Shaanxi center rotary catch rock machine, quickly escape grab bucket. Grab rock machine at work Hebei center rotary catch rock machine, be sure to obey the command of Face the hook work is strictly prohibited grab misplacing, poking, chaotic mention the central rotary catch rock machine, the driver to concentrate on serious operation, may not be arbitrarily leave to defend, while others are not allowed to operate or tamper with mechanical ministries. Central rotary catch rock machine: grab rock machine layout should be coordinated with the bucket, does not appear to ensure that working surface grab rock dead. When a single hook lift, central and grab bucket rock machine center corresponds to the center each placed on both sides of the wellbore; with two single hook lift Shandong central rotary catch rock machine, two bucket rock machine should be placed in the center of the two were arrested side; with a double hook lifting, lifting a single hook, the three buckets were placed on both sides should grasp rock machine center.