The mechanical grab itself is not equipped with an open structure, which is usually driven by a rope or a connecting rod. It can be divided into two rope grabs and a single rope grab according to the operating characteristics. The most common is a double rope grab.
The double rope grab has support rope and open and closed rope, which is wound around the supporting mechanism and the opening and closing mechanism. FIG. 1 is the working process of double rope grab: a is the support rope and the open and closed rope falling simultaneously, and the opening bucket is inserted into the pile. B to tighten open the closed rope, the jaw plate closes and grabs the material. C is the support rope and the open and closed rope rising at the same time. D to support the rope, open and close the rope to descend, the hopper open and unload the material. Double rope grab work is reliable, easy to operate, high productivity and wide application. After two sets of double rope, it becomes a four-rope grab, and the working process is the same as the double rope grab.
Single rope grab support rope and open and closed rope with the same steel wire rope. The wire rope is supported and closed by means of special locking device. The winding mechanism of single rope grab is relatively simple, but the productivity is low.
The gripper can be divided into light (such as grasping grain), medium (such as scraping gravel) and heavy (such as grasping iron ore)3 classes according to the accumulation density of captured materials. The jaw plate is divided into two jaw plate grab and multi jaw plate grab, the most commonly used is the double jaw plate grab. For large blocks of ore, iron scrap and scrap steel, it is suitable to use the multi-jaw plate grab, because it has the characteristics of multi-claw and notch tip, easy to insert the material pile, and can get better grasping effect. There is also a shear grab (FIG. 2) that imitates the structural principle of scissors. Its grasping force increases with the closure of the jaw plate and reaches the maximum at the closing time. The bucket mouth opening and the area of the cover material is better than general grab for the big, to improve the ability to capture, is good for cleaning the yard and the cabin, but for the big materials because of its initial grasping force is small, the effect is poorer.
Post time: Jul-15-2020