Grippers

A bucket grab is used to grab noncoherent materials. It works on the principle of embedding and seizure. For better seizure there may be teeth on bucket grab jaws. The grab for unloading and loading of long cargo is the same as the bucket grab, but its jaws are made in the form of claw-shaped clamps.

Through grabs, loading operations can be fully automated.

Through grabs, loading operations can be fully automated.

Type of handled material:

  • for bulk cargo:
  • for lump cargo.

The path of the jaws during cargo scooping:

  • raking path;
  • digging path.

While at work, grabs movinng in a digging path go deeper into the material, as if digging it. And the jaws of the grab moving in a raking path move in a straight line close to the horizontal line, as a result the load spread in a thin layer is raked up and scooped.

Type of the jaws closing drive and kinematic feature:

  • rope grabs;
  • power grabs.

Rope grabs have no rigid kinematical constraint between the upper and lower beam and their point of attachment to the crane. Rope grabs can be of different types depending on the number of ropes:

  • single-line rope grab;
  • two-line grab;
  • three-line grab;
  • four-line grab;
  • grabs that are driven by more than 4 ropes.

Power grabs also have their own classification. They are classified as:

  • motor grab
  • electrohydraulic grab
  • air-operated grab
  • hydraulic grab.

Motor and electrohydraulic grabs are connected to the hoist crane by a supply cable, which supplies electricity to the parts drive motor (hydraulic station or motor gear). On air-operated and hydraulic grabs, only actuators are installed: air and hydraulic actuators. This grab type is connected to the crane by compressed air mains or hydraulic mains.

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