Mechanical grab

Grab mechanical structure itself is not configured to open and close, usually driven by a rope or rod force, operating characteristics can be divided by double rope grab and single-rope grab, the most commonly used is the double rope grab.
Two rope grab opening and closing of supporting rope rope around the supporting bodies, respectively opening and closing mechanism of the roll. Figure 1 is a double rope grab the working process: a support rope and rope while opening and closing down, open the mouth into the bucket stockpile. b is the tightening of the opening and closing rope grab jaws closed and materials. c is the support rope grab is closed and the opening and closing rope simultaneously rise. d is the support rope does not move, opening and closing abseiling, bucket mouth open and remove the materials. Double rope grab, electrics tacker  easy to operate, high productivity, widely used. Using two sets of double rope after a four rope grab, work processes and the same double rope grab.
Support single rope grab ropes and opening and closing with a rope with a rope. The rope through a special locking device for opening and closing alternately supportive role. Grab the single rope winding mechanism is relatively simple, but the production is low, a large number of loading and unloading operations rarely used.
Grab crawled under the bulk density of the material is divided into light (such as crawling cereals), medium (such as crawling grit) and heavy (such as crawl iron ore) Class 3; divided by the number of double jaw jaw grab and multi-jaw grab, the most commonly used is a double jaw grab. For the bulk ore, iron and steel scrap, and should adopt more jaw grab, because it has more than claws, sharp cut features, easy to insert stockpile, can get better crawl results. There is also a structural principle of imitation scissors scissor grab, grab it with the force and energy of the closed jaws gradually increases, reaches a maximum in the closed end; their bucket mouth opening and the area of cover material than generally grab for the big, improved ability to crawl, help clean the yard and cabins, but for bulk materials because of its initial gripping force is small, less effective.