Hydraulic grab with open and closed structure, generally driven by the hydraulic cylinder.A hydraulic grab composed of multiple claws is also known as a hydraulic claw.Hydraulic grab is widely used in hydraulic excavator, hydraulic lifting tower and other special hydraulic equipment, hydraulic grab is composed of hydraulic cylinder, bucket (jaw), connecting column, bucket ear plate, bucket ear sleeve, bucket teeth, tooth seat and other parts and components of the hydraulic structure products.Therefore, welding is the most important manufacturing process of hydraulic grab.Welding quality directly affects the structural strength and service life of hydraulic grab.In addition, the hydraulic cylinder is the most critical driving component.Hydraulic grab is a special industrial equipment accessories, need special equipment to high efficiency, high quality operation, such as: CNC plasma cutting machine, groove milling machine, rolling machine, welding displacement machine, boring machine, hydraulic test bed.Excavator hydraulic grab is divided into rotary grab and non - rotary grab.The non-rotating grab adopts the oil road of excavator bucket barrel, no need to add hydraulic valve block and pipeline;A set of hydraulic valve block and pipeline should be added to control the rotary grab.