Adaptive Gripper: Bionic Robotic Handling Solution

This goes against the grain of the two central objectives of automation technology: speed and quality.

Just like the human hand
The bionic adaptive gripper, on the other hand, is light and flexible. It consists of a pneumatic actuator in the form of a bellows and three gripper fingers arranged in the Fin Ray pattern of the tail fin of a fish. The basic structure is made up of two flexible bands that meet at one end to form a triangle. Intermediate stays are connected to the bands at regular intervals by articulated joints. This flexible design enables the gripper fingers to adapt to the shape of a work piece when pressure is applied laterally - just like a human hand, but much faster.

Sorting chocolate eggs
This bionic gripper operates on the same principle in a sorting station for chocolate eggs. The gripper fingers fully enclose the chocolate eggs without crushing them or damaging the aluminium wrapping. "The flexible design of the adaptive gripper DHDG even allows the chocolate eggs to be gripped if they are leaning to one side or are incorrectly positioned," explains engineer Federico Nardone of the Italian system integrator FluidoDinamica.

The proportional pneumatic valve VPPM ensures that the pressure is correct; this allows individual acceleration and pressure ramps to be applied. The variable flow rates provided by these proportional valves allow the cylinder pressures to be adapted to a given production or sorting process. Everything is connected to the robotic controller CMXR which controls the Tripod robotic handling unit. The Tripod moves the adaptive gripper DHDG quickly towards the chocolate eggs. "This type of robot is ideal for handling light loads at high speeds," adds Nardone.

90 percent lighter
自适应抓手DHDG是使用选择性激光烧结制造的。在此过程中，施加了厚度为0.00394英寸（0.1 mm）的聚酰胺粉末的连续层，并允许硬化以硬化形成固体成分。与传统的金属抓手相比，这将作用在工具载体上的重量不少于90％。这意味着自适应抓手DHDG能够以非常节能的方式抓住和运输工件。

抓住灯泡
The advantages of these lightweight and adaptive bionic grippers are also exploited by Total Systems, a Dutch company producing machines and systems for handling flowers and bulbs. The adaptive gripper DHDG became available at just the right time as the company was developing a new machine for sorting bulbs and uses the gripper to sort the bulbs according to size and quality. The adaptive gripper now carries out the work that was previously done laboriously and less efficiently by human hands.

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