A typical clamshell grab bucket assembly is a symmetrical or near-symmetrical assembly, primarily composed of the following components:
Grab Bucket Shell/Lip
Function: The part that directly contacts the material, completing the cutting, containment, and unloading process.
Structure: Usually a curved shell structure, with reinforced and wear-resistant edges (bucket lip). Depending on the material characteristics, the bucket shell shape can be divided into shallow (suitable for bulk materials) and deep (suitable for viscous materials).
Lip & Cutting Edge
Function: To cut into the critical parts of the material, withstanding maximum wear and impact.
Structure: The blade lip is typically designed with replaceable wear-resistant liners or welded with carbide blocks. The cutting edge may be flat, serrated (for crushing or gripping large pieces of material), or wavy.
Hinge & Support Structure
Function: Connects the left and right grab bucket segments and provides a fulcrum for their opening and closing motion around the hinge axis; also connects the bucket body to the upper frame and hydraulic cylinder.
Structure: Includes hinge bushings, reinforcing ribs, lugs, etc. Requires extremely high rigidity and fatigue strength to withstand repeated impact loads.
Side Plates & Back Frame
Function: Forms the main skeleton of the grab bucket, maintaining its shape and transferring and distributing loads.
Structure: Constructed from thick steel plates welded together, with crisscrossing stiffeners inside, forming a box-shaped or frame-like structure to ensure overall rigidity and prevent deformation.
Cylinder Attachment of the Grab Bucket Lugs
Function: The hydraulic cylinder piston rod applies opening and closing torque to the bucket flaps through these points.
Structure: Features specially reinforced and stress-relieved lugs with built-in wear-resistant bushings.
