Permanent magnetic workbench

Abstract

The invention discloses a permanent magnetic workbench which comprises a chassis and a plurality of first magnetic pole groups arranged at intervals on the circumference of the chassis, wherein each magnetic pole group is arranged in the radial direction of the chassis and adjustably positioned on the upper surface of the chassis; each magnetic pole group comprises a plurality of unit magnetic poles; two adjacent unit magnetic poles are magnetically isolated from each other; each unit magnetic pole comprises an outer magnetic pole, an inner magnetic pole arranged inside each outer magnetic pole and at least one magnetic source arranged inside each outer magnetic pole or each inner magnetic pole; and the inner magnetic poles can rotate inside the outer magnetic poles to ensure the magnetization and demagnetization of the unit magnetic poles. According to the permanent magnetic workbench disclosed by the invention, the size of the magnetic pole working surface is changeable so that the utilization rate and the applicability are improved.

Description

technical field [0001] The invention relates to a workbench, in particular to a permanent magnet workbench. Background technique [0002] At present, in the milling, grinding, planing and other processing of metal workpieces, most of the workpieces are clamped and fixed by the T-shaped slots of the cast iron workbench with bolts and weights, and the weights and bolts are removed after processing. This workpiece fixing method has the problems of low precision and low processing efficiency. [0003] In order to overcome the above problems, electromagnetic and small permanent magnet workbenches have been proposed in the prior art, but the magnetic force of the traditional small permanent magnet workbench is small. The electromagnetic workbench uses coils and iron cores to generate a magnetic field. The coils and wires are easily damaged by the processing coolant, and the insulation layer is broken down, which is easy to cause electric shock accidents. [0004] For this reason...

AI Technical Summary

Problems solved by technology

[0005] However, since the magnetic pole group is fixed on the solid base plate through a fixed structure, the internal magnetic pole is affected by the internal coercive force when the internal magnetic pole is twisted, and the length of the internal magnetic pole is greatly limited (usually below 800mm at present). move, or easily twist off the inner magnetic pole connector

Therefore, when the diameter of the circular permanent magnet table is too large, its inner hole (that is, the part without the magnetic pole working surface) must also be enlarged, thus limiting the magnetic pole working surface of the permanent magnet worktable.

For example, for a circular permanent magnet table with a diameter of 2800mm, the diameter of the inner hole must be 1600mm larger. Since the workpiece cannot be adsorbed within the inner hole, this seriously limits the utilization rate and scope of application of the large permanent magnet workbench, which is especially unsuitable. Suitable for machining ring workpieces with different diameters

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