24 Volt permanent magnetic gripper. In the field of automated loading and unloading of machine tools and when handling ferromagnetic raw materials, the significance of magnetic grippers with electro-permanent magnets has considerably increased.
The EMH combines the strengths of magnetic technology with the benefits of 24 Volt technology.
After being successful with EGM series for systems in the clamping range more than 400 Volt, Schunk is now presenting an electrically actuated 24 Volt permanent magnetic gripper with integrated electronics. High power density and energy efficiency as well as the decidedly favorable interfering contour for handling are issues that make this gripper remarkable.
As the electronics are integrated into the gripper and it is actuated extremely easily via the digital I/O, the components require neither space in the control cabinet nor an external control electronics system. This saves costs and minimizes the wiring and commissioning effort. In order to increase process reliability, the gripper reports both the magnetization status and the workpiece presence. At the same time, errors are shown on an LED display of the housing. The EMH also offers advantages concerning cycle times: Unlike magnetic grippers, no maintenance time between the actuations is required, meaning high cycle times are achievable. The actual magnetization time is up to 300 ms. After magnetization, the components do not consume any energy, meaning parts are still reliably held even in case of a power outage or emergency stop. A short pulse of current is only required for deactivation.
With minimum set-up effort and no need to consider interfering contours of gripper fingers the EMH is able to handle a wide range of workpieces. Five sides of the workpiece are available for machining. The EMH is available in four sizes at a weight of one, 1,5, 6,5 and eight kg. Depending on the material, the quality of the workpiece surface, and geometry, it is suitable for workpiece weights of up to 3,5, nine, 35 and 70 kg. For handling thin components and sheets, the magnetic holding force is adjustable in four stages. pb