Summary of the invention
In view of above-mentioned condition, be necessary to provide a kind of magnet base that can regulate the magnetic force size.
a kind of magnet base, it comprises shell, magnetic part and the radome of being made by magnetic conductive material, this shell comprises the main body that offers pilot hole and is fixed in fixture on this main body, this fixture is used for placing treats fixation workpiece, this radome is contained in this shell, radome comprises cover body, shield and connector, this shield comprises shielding portion and the fixed part that extends from this shielding portion one side, this connector one end and this fixed part are affixed, the other end stretches out from this pilot hole, magnetic part is contained in cover body, cover body offers the wherein through hole of a utmost point corresponding to magnetic part, shielding portion covers at least part of through hole movably with the contact of cover body frictional property and relative cover body, and fixture is fixedly arranged on outside radome and corresponding to through hole.
When this magnet base uses, when needs are regulated the magnetic force size of magnet base, change what of area that shield covers through hole, forms the loop of sealing in radome due to the magnetic line of force that passes shield, thereby can the shaded portions magnetic line of force, the magnetic force of magnet base is changed.By cover body, the shield optionally even most magnetic field of masked segment is set, thereby can regulate the magnetic force size of magnet base.
The specific embodiment
The below is described in further detail with the magnet base that the specific embodiment also provides embodiment of the present invention by reference to the accompanying drawings.
See also Fig. 1 and Fig. 2, the magnet base 100 of embodiment of the present invention comprises shell 30, radome 50 and magnetic part 70.
Shell 30 comprises main body 32 and fixture 34.In present embodiment, shell 30 is roughly rectangle side's body.Main body 32 comprises base plate (figure is mark not) and four side plates 321 that extend from the edge-perpendicular of base plate.Offer the pilot hole 323 of strip on one of them side plate 321.On this side plate 321, contiguous pilot hole 323 places also are provided with a plurality of keepers 325.Keeper 325 is positioned at a side of pilot hole 323 and arranges successively along the bearing of trend of pilot hole 323.Main body 32 is made by non-magnetic material, and in present embodiment, main body 32 is made of copper.Fixture 34 is fixed in four side plates 321 away from an end of base plate.In present embodiment, fixture 34 is made by soft iron.
Please consult simultaneously Fig. 3, radome 50 comprises cover body 52, shield 54, slide rail 55, connector 56 and operating parts 58.Cover body 52 and shield 54 are made by magnetic conductive material.Cover body 52 shapes are similar to shell 30 shapes, and size is slightly less than shell 30, and it is contained in shell 30.Cover body 52 is comprised of six barricades 522.Offer through hole 524 on the barricade 522 of cover body 52 corresponding to fixture 34.In present embodiment.Through hole 524 is square.Shield 54 comprises shielding portion 541 and fixed part 543.Shielding portion 541 is roughly tabular, and its shape and size are substantially identical with through hole 524, can cover through hole 524.Slide rail 55 has two, and two slide rails 55 all are fixedly arranged on barricade 522, and lays respectively at the two ends of through hole 524.The bearing of trend of slide rail 55 is substantially identical with the bearing of trend of pilot hole 323.Two slide rails 55 are located at respectively at the two ends of the shielding portion 541 of shield 54, make shield 54 along slide rail 55 slidably, thereby make shield 54 be connected to barricade 522 by the mode of CONTACT WITH FRICTION, and can regulate arbitrarily the size that shielding portion 541 covers the area of through hole 524.Fixed part 543 connects shielding portion 541 and is positioned at the outside of cover body 52.In present embodiment, two slide rails 55 can adopt the mode of welding to be fixed to barricade 522, so that can keep by slide rail 55 continuity on surface between the cover body 52 of radome 50 and shield 54, and then can keep better magnetic continuity when armoured magnetic field.
Connector 56 comprises the first connecting portion 562, vertically extending the second connecting portion 564 and the 3rd connecting portion 566 from the two ends of the first connecting portion 562 respectively.The second connecting portion 564 and the 3rd connecting portion 566 extend to the not homonymy of the first connecting portion 562 respectively.The second connecting portion 564 is connected away from an end of the first connecting portion 562 and the fixed part 543 of shield 54.The 3rd connecting portion 566 away from an end of the first connecting portion 562 outside pilot hole 323 protrudes from cover body 52.Operating parts 58 is located at outside cover body 52 and is rotationally connected with the 3rd connecting portion 566.Operating parts 58 optionally is fixed in one of them of a plurality of keepers 325.
Magnetic part 70 is permanent magnet.In present embodiment, magnetic part 70 is roughly strip.Certainly, magnetic part 70 also can be U-shaped other shapes such as grade.Magnetic part 70 is contained in cover body 52, and the one utmost point is corresponding to through hole 524.
During use, the workpiece (not shown) is positioned on fixture 34, pull operating parts 58 and slide by the barricade 522 that is fixed in the connector 56 drive shield 54 relative cover bodies 52 on operating parts 58, make the shielding portion 541 of shield 54 no longer cover through hole 524, thereby the magnetic line of force of magnetic part 70 can pass through hole 524 with fixture 34 magnetization, so with absorption of workpieces in magnet base 100.
When needs are regulated the magnetic force size of magnet base 100, rotating operation spare 58, make it no longer be fixed in keeper 325, pull connector 56, drive barricade 522 and slide, make shield 54 shaded portions through holes 524, thereby make the magnetic line of force that passes shield 54 in the loop of the interior formation sealing of radome 50, thereby can the shaded portions magnetic line of force, the magnetic force of magnet base 100 is diminished.
When shield 54 covers through hole 524 fully, equal conductively-closed cover 50 shieldings of most magnetic lines of force, magnet base 100 shows extremely weak magnetic or does not show magnetic.
By cover body 52, the shield 54 optionally even most magnetic field of masked segment is set, thereby can regulate the magnetic force size of magnet base 100, use more convenient.
Be appreciated that shield 54 is not limited to adopt slide rail to be located at slidably barricade 522, as long as shield 54 uses friction components to be arranged at barricade 522, make that between shield 54 and barricade 522, good the contacting of maintenance gets final product.
Be appreciated that, also can adopt the mode of engagement to coordinate between operating parts 58 and keeper 325, be about to operating parts 58 and be replaced by gear, with keeper 325 change into extend along pilot hole 323 bearing of trends and with the tooth bar of gear engagement, gear is moved along tooth bar can drive shield 54 and move.
The main body 32 that is appreciated that shell 30 can be omitted, and directly be fixedly arranged on fixture 34 side of cover body 52 this moment, makes that fixture 34 is relative with through hole 524 to be got final product.
In addition, those skilled in the art also can do other variation in spirit of the present invention, and certainly, the variation that these are done according to spirit of the present invention all should be included in the present invention's scope required for protection.