CS250337B1 - Electromagnetic gripper - Google Patents

Abstract

The solution falls into the field of auxiliary mechanisms of single-purpose machine tools and concerns an electromagnetic gripper of a single-purpose machine manipulator. Its essence is that, in order to eliminate the disadvantages resulting from residual magnetism, the clamping surfaces of the pole extensions of the electromagnet are provided with (tips, or foils of magnetically non-conductive material, to create a layer that muffles the effects of residual magnetism in the gripper after the interruption of the electric current supply to the electromagnet winding.

Description

BACKGROUND OF THE INVENTION The present invention relates to an electromagnetic gripper, particularly for single-purpose machine manipulators. With the development of manipulators and robots currently used for handling parts intended for processing, especially on single-purpose machines, mainly hydraulic grippers and feeders are used, but electromagnetic grippers are used to a lesser extent. This is particularly the case when using an electromagnetic gripper where the component is clamped by electromagnetic force to transfer the component to the next manipulator, it is due to the residual magnetism of the looper that the clamped component is not released immediately and there is a delay that is not satisfactory for the machine tool operation .

This is particularly disadvantageous when the other electromagnetic gripper takes over the component. In this case, the electromagnetic grippers, in particular when specially designed, have great advantages over hydraulic grippers. It is therefore an object to develop an electromagnetic gripper which overcomes the disadvantages caused by residual magnetism.

The drawbacks and drawbacks of the known solutions are basically eliminated by the invention, which is an electromagnetic gripper formed by a body in which the solenoid itself is housed, the core of which is fixedly connected to the pole pieces.

It is an object of the invention that a layer of magnetically inert material is formed between the active clamping surface of the pole pieces of the electromagnet.

It is a further object of the invention that the active clamping surface of the pole pieces of the electromagnet is provided with a series of tips of a magnetically inert material, for example copper, with a height of up to 1 mm.

Finally, it is an object of the invention that the active clamping surface of the pole pieces of the electromagnet is provided with a film of a magnetically inert material, for example plasticized polyvinyl chloride.

The higher effect of the invention is that the new design reduces the effects of residual magnetic force after the power supply to the solenoid winding has been switched off so that the component is released from the pole piece support surface with a slight magnetic-loss loss.

Claims (3)

OBJECT An electromagnetic gripper formed by a body in which a solenoid is disposed, the pole pieces of which are rigidly connected to the core, the active gripping surface of which corresponds to the profile of the clamped component, characterized in that the effective clamping surface (8) of the pole pieces (6 ) of the electromagnet (3) is provided with means of magnetically inert material. 2. Electromagnetic gripper according to lateral force with live electromagnet. The new electromagnet design allows trouble-free and smooth operation of the part to be machined from operation to operation. The repair can also be carried out on existing electromagnetic grippers. An example of a particular embodiment of the invention is shown schematically in the accompanying drawing, in which, in the case of a pole piece, a basic embodiment with spikes is shown and an alternative embodiment with a foil is provided for the second pole piece. According to the invention, the electromagnetic gripper 1 consists of a hollow body 2 of a magnetically inert material, for example of aluminum, in which cavity has its own electromagnet 3 formed by winding 4 and a core 5, and two pole pieces 6 connected rigidly to the core 5 of the electromagnet 3. Body 2 is closed by a lid 7, also of magnetically inert material. The protruding portion of the pole pieces 6 is configured such that their effective support surface 8 corresponds to the shape of the clamped component and thus exhibits maximum magnetic force efficiency. In order to counteract the effects of residual magnetism upon interruption of the electric current supply to the winding 4 of the electromagnet 3, these active support surfaces 8 are provided with either a series of fine spikes 9 of a non-conductive material, such as copper, as shown in the left pole piece in the drawing, or alternatively a thin film 10 of a non-magnetic material, such as plasticized polyvinyl chloride. Depending on the type of material used, the tines 9 can either be screwed into or adhered to the active clamping surface 8 of the pole piece 6. When the film 10 is used, it is glued to the active surfaces 8. Both the spikes 9 and the film 10 form a small air layer between the active clamping surface 8 of the pole pieces 8 of the electromagnet 3, which imparts some resistance to the passage, magnetic field lines sufficient to completely eliminate the effect of residual magnetism on the active clamping surfaces 8 pole pieces 6 of the electromagnet 3. At the same time, the operational magnetic force of the electromagnet 3 under current is reduced by this negligible value. Characterized in that the magnetically inert material means comprises at least three tines (9) with a height of at most one millimeter. 3. The electromagnetic gripper according to claim 1, wherein the magnetically inert material comprises a film (10), for example, a plasticized polyvinyl chloride. 1 sheet of drawings 250337