JP6670628B2 - Magnetic adsorption device - Google Patents

Description

  The present invention relates to a magnetic attraction device, and more particularly to an improved structure of a magnetic attraction device that is suitably used when a workpiece to be processed is attached to a table or the like of a machine tool.

  Conventionally, when attaching a workpiece, which is a workpiece, to a table or the like of a machine tool, supporting devices such as various types of vise and clamps are appropriately provided according to the type of processing on the workpiece, the size of the workpiece, the material, and the like. Has been selected and used. When the work is made of a ferromagnetic material, a so-called magnetic attraction device that attracts the work to the support surface by magnetic force and supports or holds the work is preferably used as the support device.

  Further, such a magnetic attraction apparatus has, for example, an apparatus main body having a support surface for adsorbing and supporting (holding) a work (adsorbed object) made of a ferromagnetic material, and a support body is provided inside the apparatus main body. At least one magnetic unit for generating a magnetic flux is provided on the surface and configured. The magnetic unit is configured such that the inner peripheral surface and the outer peripheral surface are magnetic poles having polarities different from each other, and generates a magnetic flux emitted from the support surface of the apparatus main body. A first core surrounded by a permanent magnet, a coil arranged coaxially adjacent to the annular permanent magnet, and generating a magnetic flux emitted from a support surface of the apparatus body by energization; And a second core surrounded by. Further, in the coil of such a magnetic unit, the direction of the current flowing therethrough is changed, whereby the magnetic pole is reversed, and the direction of the generated magnetic field is switched.

  In the magnetic attraction device having such a configuration, for example, of the magnetic poles at both ends in the axial direction of the coil, the polarity of the magnetic pole at one end in the axial direction adjacent to the annular permanent magnet has the polarity of the annular permanent magnet. A current is applied to the coil so that the polarity of the magnetic pole on the inner peripheral surface is the same, and the direction of the magnetic field of the coil is made to match the direction of the magnetic field of the annular permanent magnet. , And a clamp state in which the workpiece is sucked and held on the support surface is realized. Also, a current is applied to the coil so that the polarity of the magnetic pole on one end in the axial direction adjacent to the annular permanent magnet is different from the polarity of the magnetic pole on the inner peripheral surface of the annular permanent magnet. By setting the direction of the magnetic field to be opposite to the direction of the magnetic field of the annular permanent magnet, the magnetic field of the annular permanent magnet and the magnetic field of the coil are offset, so that the magnetic flux is not released from the support surface. By doing so, the suction of the work on the support surface is eliminated, and the support surface is brought into the unclamped state.

  Therefore, if a magnetic attraction device having such a structure is used, a work made of a ferromagnetic material is strongly attracted to a support surface of the device by a magnetic flux emitted from a magnetic unit built in the device, While being able to support or hold, while stopping the release of magnetic flux from the magnetic unit to the support surface, it is possible to eliminate the suction of the work. The troublesome labor can be simplified, and the processing efficiency of the work can be effectively improved.

  Incidentally, as such a magnetic attraction device, for example, Japanese Patent No. 5449324 (Patent Document 1) discloses that at least one pole piece collector is provided within a thickness of a support structure (device main body) having a predetermined size. A first magnetic core that is a permanent magnetized reversible magnetic core, an electric coil for changing the magnetization state of the first magnetic core, and a permanent magnetized irreversible magnetic core. A pole piece having at least one pole piece with a second magnetic core, the pole piece formed on a first side of a relatively large opposing surface of the support structure for transmitting magnetic flux generated from the magnetic device. An integrated magnetic device configured to communicate from a collector is disclosed.

  According to the integrated magnetic device disclosed in Patent Document 1, in a support structure that provides an apparatus main body as a magnetic attraction device, a work (an object to be attracted) made of a ferromagnetic material is placed and supported. On the first side, a pole piece collector from which a magnetic flux for clamping (adsorbing) the work to the support surface is released is formed from one member integrally with the support structure (apparatus main body). Thus, the robustness of the clamp surface (support surface) is reduced as in a device in which the support structure and the pole piece collector are configured separately as disclosed in Patent Document 1 as a conventional magnetic attraction device. Without the problem described above, the strength of the work supporting surface can be effectively improved. As a result, the mechanical stress applied to the support surface, that is, the stress applied to the pole piece collector from the work adsorbed on the support surface can be well dispersed to the support structure. Thus, the stress and vibration generated during machining can be efficiently absorbed, and the machining accuracy of the workpiece can be advantageously improved.

  Further, in such an integrated magnetic device, from the second side opposite to the first side which is the support surface of the work in the support structure, in other words, from the back side (lower side) of the device, A recess for accommodating a pole piece made of an electric coil or the like constituting the magnetic unit is formed, and in a form protruding in the recess, a pole piece collector as a portion from which magnetic flux is emitted is integrated with the support structure. Is formed on the surface (first side) on which the work is supported, there is no opening leading to the recess for accommodating the pole piece, and therefore, it is used when processing the work. It is possible to effectively avoid or eliminate the possibility that a liquid such as a cutting oil or a cooling liquid enters the inside of the device and lowers the function as a magnetic device. Then, since there is no danger of liquid infiltrating into the inside of the device, a pole is provided in a recess provided from the upper portion of the support structure, which is disclosed as a conventional magnetic attraction device in Patent Document 1. The pieces are accommodated, and the gap between the surface of the support structure and the surface of the pole piece collector is filled with a resin or the like. Liquid such as cutting oil or cooling liquid enters the inside of the device, and the wiring of the electric coil constituting the pole piece, which is the magnetic unit housed in the recess, is damaged, and the device is broken. The problem can be advantageously prevented from occurring.

  However, in the integrated magnetic device disclosed in Patent Literature 1, a magnetic flux is transmitted to a first side, which is a surface supporting a work, in a support structure constituting a device main body of a magnetic attraction device. The pole piece collector is formed in one piece (integrally), and in the recess provided for accommodating the pole piece, which is a magnetic unit, in the support structure, the pole piece collector is present in the form of a protrusion, so that such a recess is formed. Since the shape is no longer a simple depressed shape, processing of such a recess takes a lot of time and labor, the manufacturability is deteriorated, and there is a problem that the manufacturing cost of the magnetic attraction device is increased. .

  That is, while the pole piece, which is a magnetic unit, is housed inside the support structure, which is the main body of the apparatus, the recess that allows the pole piece collector, which is a part of the magnetic unit, to be formed with respect to the support structure, is provided. From the second side, which is the opposite side (back side) to the first side which is the surface supporting the work, a first portion having a simple round hole shape having a predetermined diameter and depth, and the first portion And a second portion that is an annular ring cavity having a predetermined depth and an outer diameter equal to the diameter of the portion and a predetermined inner diameter. Such an annular ring cavity is formed, for example, by cutting the support structure to a predetermined depth to form a recess serving as a first portion, and further forming a recess on the bottom surface of the recess of the first portion. Then, while forming a groove of a predetermined width, by annularly cutting to a predetermined depth, while leaving a central portion of the bottom surface of the concave portion that is the first portion with a predetermined size, Although it is possible to form the annular ring cavity as the second part, the processing of such a deep groove requires much more time and labor than the ordinary concave processing, so that the manufacturing cost increases. In addition, there is a problem that it is practically impossible to form such a recess in a rectangular shape such as a rectangle other than a circle.

Japanese Patent No. 5449324

  Here, the present invention has been made in view of such circumstances, and a problem to be solved is to place a workpiece while preventing liquid from entering into the magnetic adsorption device. It is an object of the present invention to provide an improved magnetic attraction device capable of increasing the strength of the surface to be supported and improving the manufacturability and advantageously reducing the manufacturing cost.

  In the present invention, in order to solve such a problem, an object to be adsorbed made of a ferromagnetic material is placed, and a support surface for adsorbing and supporting the object to be adsorbed, A permanent magnet having at least one magnetic unit that emits a magnetic flux, wherein the magnetic unit is a magnetic pole whose inner and outer surfaces are magnetic poles having polarities different from each other, and a first magnet surrounded by the permanent magnet. And a second core surrounded by the coil, which is arranged so as to be coaxially adjacent to the permanent magnet and generates a magnetic flux by energization, and The direction of the magnetic field of the permanent magnet and the direction of the magnetic field of the permanent magnet are set to be the same direction, so that the object to be attracted is attracted to the support surface by the magnetic flux emitted from the support surface, and the magnetic pole of the coil So that the The direction of the current flowing through the coil is changed, and the direction of the magnetic field of the coil is made opposite to the direction of the magnetic field of the permanent magnet. In the magnetic attraction device configured to be able to be canceled, the device main body is formed of a thick plate-shaped support made of a ferromagnetic material, and at least one concave portion is opened on the upper surface of the support. A plate is formed of a ferromagnetic material having an upper surface serving as the support surface, wherein the magnetic unit is accommodated in the recess and the opening of the at least one recess is covered. The gist of the present invention is a magnetic attraction device characterized in that the lid is placed on the support and the plate-shaped lid and the support are fixed by fixing means.

  According to one preferred embodiment of the magnetic attraction device according to the present invention, the plate-like lid is thinned at a portion located above the permanent magnets constituting the magnetic unit housed in the recess. Will be done.

  According to another preferred aspect of the present invention, the plate-like lid has a groove in a lower surface portion located at a peripheral portion of the recess, and packing is accommodated in the groove. Then, the recess is sealed with the plate-shaped lid by the packing.

  As described above, in the magnetic attraction device according to the present invention, the recess for accommodating the magnetic unit has a predetermined depth so as to be opened on the upper surface of the thick plate-shaped support serving as the device main body. And the opening of the recess is covered with a plate-like lid made of a ferromagnetic material placed on a support, and the structure is made hermetically sealed. As in the conventional magnetic adsorption device formed by filling the gap between the magnetic unit and the support housed in the space with a filler such as resin, cracking or cracking of the filler causes cutting oil or cooling in the recess. It is possible to effectively eliminate the problem that the magnetic unit is damaged due to the intrusion of the liquid into the recess without the risk of the liquid or the like entering the recess. It has become.

  Further, in such a magnetic attraction device according to the present invention, the to-be-adsorbed object made of a ferromagnetic material is placed and the supporting surface to be supported is placed on the upper part of the thick plate-shaped support. The rigidity of such a support surface can be effectively increased from the place where it is formed in the plate-shaped lid body, and therefore, the processing accuracy of the workpiece to be sucked and held on the support surface and processed. Can be advantageously increased.

  Further, in the magnetic attraction device according to the present invention, the internal shape of the recess formed on the thick-plate-shaped support for accommodating the magnetic unit has the same shape as that of the conventional magnetic attraction device. It is not necessary to have a complicated shape formed by forming a convex portion that forms a part of the magnetic unit.Since it is simply a recess having a simple shape that can correspond to the outer shape of the magnetic unit, In addition to being able to effectively improve the workability when forming a recess in the support body, which is the main body of the apparatus, in addition to the fact that a thick plate-shaped A magnetic unit having a predetermined configuration that emits a magnetic flux for adsorbing an object to be adsorbed made of a ferromagnetic material is accommodated in a recess formed at a predetermined depth so as to open on the upper surface of the support, and the magnetic unit is used. Is covered with a plate-shaped lid. Then, since the plate-shaped lid and the support are fixed by the fixing means, the manufacturability of the apparatus can be advantageously improved, and as a result, the manufacturing cost of the magnetic adsorption apparatus can be reduced. It is possible to reduce the total.

  In addition, a support surface on which the object to be formed of a ferromagnetic material is placed and supported is placed on the apparatus main body (support), and is constituted by an upper surface of a fixed plate-like lid. If the support surface is damaged due to scratches, etc., the accuracy will decrease, or if the thickness of the support surface becomes insufficient when polishing the surface of the support surface to correct machine tool errors. Even if there is, simply exchanging such a plate-like lid with a new one, the accuracy of the support surface can be increased again, and the effect that the maintainability of the magnetic adsorption device is also excellent is exhibited. Becomes

1 is an explanatory perspective view showing one embodiment of a magnetic attraction device according to the present invention. FIG. 2 is an explanatory sectional view showing a part of an AA section in FIG. 1 in an enlarged manner. FIG. 3 is a cross-sectional explanatory view (corresponding to a BB cross section in FIG. 2) schematically illustrating an arrangement of permanent magnets constituting a magnetic unit in the magnetic attraction device illustrated in FIG. 1. FIG. 2 is a diagram for explaining a use state of the magnetic adsorption device shown in FIG. 1, and is an explanatory diagram showing a state where an object to be adsorbed is adsorbed to the magnetic adsorption device. FIG. 4 is a diagram for explaining another use state of the magnetic attraction device shown in FIG. 1, and is an explanatory diagram showing a state in which an object to be attracted is not attracted to the magnetic attraction device.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows an example of a magnetic attraction device having a structure according to the present invention in the form of a perspective view. Here, the magnetic attraction device 10 includes a base 12 that provides a support that is a device main body of the magnetic attraction device, an upper cover 14 that is a plate-shaped lid placed on the base 12, and a It has a control unit (not shown).

  More specifically, the base 12 is formed of a thick rectangular flat plate having a long rectangular shape, and is formed by using a ferromagnetic material such as an iron material. The base 12 is formed of a body material and has a flat plate shape large enough to cover substantially the entire upper surface of the base 12. Then, such an upper cover 14 is arranged in a form of being overlapped so as to cover the upper surface of the base 12, and the base 12 and the upper cover 14 are fixed using predetermined fixing means such as screws, and integrated. Thus, the apparatus main body of the magnetic attraction apparatus 10 is configured.

In such a magnetic attraction device 10, the upper surface of the upper lid 14 superimposed on the base 12 is a flat support surface 16 on which a workpiece, which is a ferromagnetic material, is placed. On the other hand, the lower surface of the base 12, that is, the surface of the base 12 opposite to the surface on which the upper lid 14 is superimposed is a flat mounting surface 18 which is mounted on a table or the like of a machine tool (not shown). I have. A plurality of (four in this example) shallow circular grooves 20 are formed on the support surface 16 of the upper lid 14 as outer annular grooves in the length direction and the width direction of the base 12. Then, they are arranged and formed side by side. Further, a jig or the like used for stably placing a work on the support surface 16 at a depth that does not penetrate the upper lid 14 is fixed at the center of each circular groove 20 on the support surface 16. A female screw hole 22 to be used is provided.

Further, on the surface of the upper lid 14 opposite to the support surface 16, that is, the surface facing the base 12, as shown in FIG. Are formed at predetermined depths as inner annular grooves, respectively. The size (diameter) of each of the circular grooves 20 and 24 is set to a size substantially corresponding to a magnetic unit 30 described later. Here, the circular grooves 20 and 24 are provided on the base 12. The size is such that it is located at the peripheral edge of the housing recess 28 for housing the magnetic unit 30. Since the circular grooves 20 and 24 are formed in the upper lid 14, the thickness of the upper lid 14 is increased between the inner portion and the outer portion surrounded by the circular grooves 20 and 24 in the thickness direction. Are narrowed down to form a thinned portion.

  Further, an annular packing 26 made of a predetermined rubber material is accommodated in a circular groove 24 formed on a surface of the upper cover 14 facing the base 12. The packing 26 also seals a small gap generated between the upper lid 14 and the base 12 so that the housing recess 28 provided on the base 12 is securely sealed. It is. Here, the packing 26 is exemplified as having a substantially L-shaped cross section. However, the packing 26 is accommodated in a groove provided on the lower surface of the upper lid 14 which is a plate-like lid, and is provided with the upper lid 14. As long as it can enhance the sealing property between the base 12 and the ring-shaped elastic body having a circular cross section, a so-called O-ring, and other known various packings, it is possible to appropriately select and use the packing. It is possible.

  On the other hand, in the base 12, as shown in FIGS. 2 and 3, a plurality (four in this case) of circular accommodation recesses 28 are attached to the upper surface side of the base 12, in other words, the upper lid 14. It is provided so as to open on the side surface. The plurality of housing recesses 28 are formed in the same number as the circular grooves 20 and 24 formed in the upper lid 14 superimposed on the upper portion of the base 12 and in the respective circular grooves 20 and 24 formed in the upper lid 14. At a corresponding position and size, it is formed in the thickness direction of the base 12 as a circular recess having a diameter and depth large enough to accommodate the magnetic unit 30 described later.

  The magnetic unit 30 including the permanent magnet 32, the first core 34, the coil 36, and the second core 38 is provided in the plurality of circular housing recesses 28. Each one is accommodated and arranged. Here, among the four members constituting the magnetic unit 30, first, the permanent magnet 32 arranges a plurality (eight in this case) of magnet pieces having an arc-shaped cross section and accommodates them in the accommodation recess 28. It is configured as a cylindrical combination having an outer diameter and a cylindrical wall having a predetermined thickness, and the inner peripheral surface and the outer peripheral surface thereof are magnetic poles having polarities different from each other, that is, with respect to the radial direction of the cylindrical shape. It is composed of a neodymium magnet having a polarity. Here, the permanent magnet 32 is composed of a neodymium magnet, but it is of course possible to configure the permanent magnet 32 by other known various permanent magnets.

  In addition, the first core 34 has a cylindrical shape of the permanent magnet 32 as a size that can be inserted inside the cylindrical permanent magnet 32 made of such a combined body in one independent object form. It has a diameter slightly smaller than the inner diameter, and has a columnar shape having a height that is approximately half the depth of the housing recess 28 that is substantially the same height as the permanent magnet 32. The first core 34 is formed using a ferromagnetic material such as an iron material, like the base 12 and the upper lid 14, and is emitted from the permanent magnet 32, the coil 36, and the second core 38. Magnetic flux can be transmitted effectively.

  Further, the coil 36 has an outer diameter substantially the same as the outer diameter of the permanent magnet 32 and has a conductor wound around a bobbin so as to have a cylindrical shape having a height approximately half the depth of the housing recess 28. It is formed by being turned. Here, such a coil 36 is illustrated as using a coil formed by winding a conductor on a predetermined bobbin, but a coil formed as a bobbin-less coil without using a bobbin is used here. Of course, it is also possible.

  Furthermore, the second core 38 has a diameter slightly smaller than the inner diameter of the cylindrical shape of the coil 36 using an Alnico magnet made of an Al-Ni-Co alloy, and has the same height as the coil 36. It is formed as one independent object so as to exhibit the formed cylindrical shape. Here, in the second core 38 formed of such an alnico magnet, both ends (upper and lower ends in FIG. 2) of the columnar shape in the axial direction are magnetic poles having polarities different from each other. Further, the polarity of such magnetic poles can be appropriately changed by a magnetic field generated by energizing the coil 36. Note that, here, the second core 38 is formed using an alnico magnet. However, as long as the polarity of the magnetic pole of the second core 38 can be appropriately changed by the coil 36, various known various cores can be used. It is also possible to use magnets.

In the present embodiment, the four members thus formed are inserted and arranged in the circular accommodation recesses 28, respectively, to configure the magnetic unit 30. Specifically, the second core 38 is housed inside the cylindrical shape of the coil 36, and the second core 38 surrounded by the coil 36 is placed below the housing recess 28. while it is arranged, and such coils 36 on the upper side of the second core 38, first core 3 4 is arranged which is surrounded by the permanent magnets 32 arranged so as to be cylindrical, magnetic unit 30 Is configured.

  As shown in FIG. 3, here, in each magnetic unit 30 housed in each housing recess 28, here, the magnetic units 30 positioned adjacent to each other in the width direction and the length direction of the base 12 are used. Of these, the magnetic pole on the inner peripheral surface (outer peripheral surface) of the permanent magnet 32 of one magnetic unit 30 and the magnetic pole on the inner peripheral surface (outer peripheral surface) of the permanent magnet 32 of the other magnetic unit 30 are mutually They are arranged so as to have different polarities.

  Further, the magnetic poles at both ends in the axial direction of the columnar shape of the second core 38 of each magnetic unit 30 can be appropriately changed by energizing the coil 36 surrounding the second core 38. However, in order to set a state in which no magnetic flux is emitted to the support surface 16 of the magnetic attraction device 10 as an initial state, the magnetic poles on the inner peripheral surface side of the permanent magnet 32 constituting the same magnetic unit 30 are required. The magnetic pole on the upper side in the axial direction of the second core 38 is a magnetic pole having a different polarity.

  Further, although not shown, all of the conductors of the coil 36 included in each magnetic unit 30 are electrically connected to the connector 40 provided on the side surface of the base 12 inside the base 12. . The power supply to each coil 36 in each magnetic unit 30 is controlled by being connected to a control unit (not shown) via such a connector 40.

  Under such control from the control unit, for example, of the magnetic poles generated on both sides in the axial direction of the coil 36 by energization, the magnetic pole on the axially upper side (permanent magnet 32 side) of the coil 36 An electric current is caused to flow through the coil 36 so as to have the same polarity as the magnetic pole on the inner peripheral surface, whereby the upper side in the axial direction of the second core 38 surrounded by such a coil 36 (the permanent magnet 32 side). Have the same polarity as the magnetic pole inside the permanent magnet 32. Then, as shown in FIG. 4, the direction of the magnetic field of the coil 36 in each magnetic unit 30, in other words, the direction of the magnetic field from the second core 38 to the first core 34, The direction of the magnetic field heading toward the core 34 is the same direction, and the magnetic flux generated by the second core 38 and the permanent magnet 32 is transmitted through the first core 34 to the magnetic attraction device 10. It is guided in the vertical direction, which is the thickness direction, and is released from the support surface 16 of the upper lid 14. Then, the magnetic flux released from the support surface 16 passes through the inside of the ferromagnetic work 50 placed on the support surface 16, so that the work 50 As a result, the work 50 is clamped by the magnetic attraction device 10.

  On the other hand, of the magnetic poles generated on both sides in the axial direction of the coil 36 by energization under control from a control unit (not shown), the magnetic pole on the upper side in the axial direction of the coil 36 is different from the magnetic pole on the inner peripheral surface of the permanent magnet 32. By supplying a current to the coil 36 so as to have a polarity, the magnetic pole on the upper side in the axial direction of the second core 38 also has a different polarity from the magnetic pole inside the permanent magnet 32. Accordingly, the direction of the magnetic field from the second core 38 to the first core 34 in each magnetic unit 30 is opposite to the direction of the magnetic field from the permanent magnet 32 to the first core 34. As shown in FIG. 5, the magnetic field of the second core 38 and the magnetic field of the permanent magnet 32 cancel each other, and the state is closed inside the base 12 of the magnetic attraction device 10. As a result, the magnetic flux generated by the second core 38 and the permanent magnet 32 is not released from the support surface 16 of the upper cover 14, and the magnetic flux does not pass through the inside of the work 50. The attraction state with respect to the support surface 16 is cancelled, and the magnetic attraction device 10 enters the unclamped state.

  According to the magnetic attraction device 10 having the structure according to the present invention, the magnetic flux generated by the magnetic unit 30 housed and arranged in the device main body causes the ferromagnetic work 50 to be attached to the support surface 12 by the magnetic flux. On the other hand, the magnetic attraction device 10 is fixed to a table or the like of a machine tool so that it can be easily supported (held) or released. The workability when the work 50 is mounted can be effectively improved.

  In such a magnetic attraction device 10, the opening of the housing recess 28 formed at a predetermined depth so as to open on the upper surface of the base 12 for housing the magnetic unit 30 is provided. Since it is covered with the upper lid 14 placed on the table 12 and has a structure to be hermetically sealed, a cutting oil, a cooling liquid, and the like used when processing the work 50 held on the support surface 16 are used. Is not likely to enter the accommodation recess 28, and as a result, there is no problem that the coil 36 constituting the magnetic unit 30 is damaged by the entry of the liquid. is there.

  Further, since the packing 26 is accommodated in the circular groove 24 formed on the surface of the upper lid 14 facing the base 12, the upper lid 14 and the accommodation recess 28 provided on the base 12 are formed. Because of the sealing between the peripheral edge and the peripheral edge, the sealing performance of the receiving recess 28 can be advantageously improved, and the penetration of the liquid into the receiving recess 28 can be further improved. It will be able to prevent it.

  In the magnetic attraction device 10, the support surface 12 on which the workpiece 50 is placed and supported is formed as a plate-shaped upper lid 14 having a predetermined thickness, which is placed on the upper portion of the base 12. Therefore, it is possible to effectively increase the rigidity of the support surface 12, and it is possible to advantageously increase the processing accuracy of the workpiece 50 which is sucked and held on the support surface 12 and is processed. It becomes.

  In addition, in the upper lid 14, a portion located above the permanent magnet 32 constituting the magnetic unit 30 housed in the housing recess 28 of the base 12 is thinned by the circular grooves 20 and 24. Since the magnetic flux is more difficult to transmit in such a thin portion than in other portions, the magnetic flux is effectively transmitted in the thickness direction of the upper lid 14 made of a ferromagnetic material. On the other hand, it becomes difficult for the magnetic flux to be guided between the inner part and the outer part where the circular grooves 20 and 24 are formed. As a result, the magnetic flux emitted from the magnetic unit 30 disposed inside the circular grooves 20 and 24 is guided more to the surface of the support surface 16 of the upper lid 14, and the work 50 is moved. It becomes possible to make it strongly adsorb.

  Further, in the magnetic attraction device 10, the inside shape of the housing recess 28 for housing the magnetic unit 30 formed on the base 12 is simple enough to correspond to the outer shape of the magnetic unit 30. Since the concave portion is formed in a circular shape having a simple shape, it is possible to effectively improve the workability in forming such a housing concave portion 28 in the base 12. Further, in addition to the workability of such a housing recess 28 being significantly improved, the magnetic unit 30 is housed in the housing recess 28 formed so as to open on the upper surface of the base 12, Then, the accommodating recess 28 in which the magnetic unit 30 is accommodated is covered with the upper lid 14, and the upper lid 14 and the base 12 are fixed with fixing means such as screws, so that the magnetic adsorption device 10 is assembled. Thus, the manufacturability of the device can be advantageously improved, and as a result, the manufacturing cost of the magnetic attraction device 10 can be effectively reduced.

  In addition, the support surface 16 on which the work 50 is placed and supported (held) is constituted by the upper lid 14 which is attached and fixed to the upper surface of the base 12 which provides the apparatus main body of the magnetic attraction device 10. Therefore, even when the support surface 12 of the magnetic attraction device 10 needs to be replaced because it is scratched or the like, it is only necessary to replace the top cover 14 without replacing the entire device. Also, the effect that the maintainability of the magnetic attraction device 10 is excellent is also exhibited.

  As described above, one of the typical embodiments of the present invention has been described in detail. However, it is merely an example, and the present invention is not limited to any specific description according to such an embodiment. It is to be understood that they are not to be construed as limiting.

  For example, in the above-described embodiment, the magnetic unit 30 includes the first core 34 surrounded by the cylindrical permanent magnets 32 and the second core 38 surrounded by the cylindrical coil 36. By combining the magnetic unit 30 and the housing unit 28, the housing unit 28 in which the magnetic unit 30 is housed has a circular shape corresponding to the shape of the magnetic unit 30. The shape of the magnetic unit 30 may not be a columnar shape as long as it can be processed as the shape of the recess accommodating the magnetic unit 30 in the base 12, and for example, the shape of the cross section perpendicular to the axial direction may be a square or The magnetic unit 30 may have a polygonal prism shape such as a hexagon. When the magnetic unit 30 has a polygonal prismatic shape, the circular groove 20 formed on the support surface 16 of the upper lid 14 and the circular groove 24 formed on the back surface of the magnetic unit 30 are An annular groove having a polygonal shape corresponding to the shape of No. 30 is formed.

  In this embodiment, a circular groove 20 is formed on the support surface 16 side of the upper lid 14, and a circular groove 24 is formed on the surface opposite to the support surface 16 so that the upper surface can be accommodated in the magnetic attraction device 10. Although the thickness of the upper lid 14 located above the permanent magnet 32 constituting the magnetic unit 30 is reduced in thickness, a groove is formed on only one surface of the upper lid 14 so that It is also possible to form such a thin portion. However, since the magnetic unit 30 housed in the housing recess 28 provided on the base 12 is covered by the upper cover 14 and is hidden, the support surface 16 of the magnetic adsorption device 10 is In order to clarify to the operator where the magnetic flux is released, in other words, where on the support surface 16 the work is adsorbed, the surface of the support surface 16 is also used. It is preferable to form a circular groove 20 in the groove.

  Further, in the above-described embodiment, the packing 26 is accommodated in the circular groove 24 formed to reduce the thickness of the upper lid 14, and the accommodation recess 28 provided in the upper lid 14 and the base 12. However, apart from such a circular groove 24, another annular shape or a size that is located on the lower edge of the upper lid 14 at the peripheral edge of the accommodation recess 28 and can surround the accommodation recess 28. It is also possible to form a circular groove for accommodating the packing 26 in such a groove.

  In addition, as a method of fixing the upper lid 14 forming the support surface 16 to the base 12 constituting the support that provides the apparatus main body of the magnetic attraction device 10, fixing by screwing is advantageously adopted. However, in addition, various known fixing methods such as fixing them by welding can be adopted.

  In addition, although not enumerated one by one, the present invention can be embodied in modes in which various changes, modifications, improvements, and the like are added based on the knowledge of those skilled in the art. It goes without saying that all of them belong to the category of the present invention without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Magnetic adsorption apparatus 12 Base 14 Top cover 16 Support surface 18 Mounting surface 20 Circular groove 22 Female screw hole 24 Circular groove 26 Packing 28 Storage recess 30 Magnetic unit 32 Permanent magnet 34 First core 36 Coil 38 Second core 40 Connector 50 Work 52 Table

Claims (1)

An object to be adsorbed made of a ferromagnetic material is placed thereon, and a support surface for adsorbing and supporting the object to be adsorbed, and a plurality of magnetic units which are disposed independently of each other and emit magnetic flux from the support surface. together with, said plurality of magnetic units, respectively, and the permanent magnet and the inner and outer surfaces is a magnetic pole having different polarities, a first core that is surrounded by the permanent magnets, and the permanent magnet A coil, which is arranged coaxially adjacent to and generates a magnetic flux by energization, and a second core surrounded by the coil, includes a direction of a magnetic field of the coil and the permanent magnet. The direction of the magnetic field is the same as that of the coil, so that the object to be attracted is attracted to the support surface by the magnetic flux emitted from the support surface, and the magnetic pole of the coil is reversed. Changes the direction of the current flowing through Then, the direction of the magnetic field of the coil is made opposite to the direction of the magnetic field of the permanent magnet, so that the object to be attracted can be prevented from being attracted to the support surface. In the magnetic adsorption device,
The apparatus main body is formed of a thick plate-shaped support made of a ferromagnetic material, and a plurality of recesses corresponding to the plurality of magnetic units are formed in the support so as to open on the upper surface of the support. in embodiments in which a arranged in a length direction and a width direction, and allowed to form independently a predetermined depth, to the plurality of the recesses, as to accommodate a plurality of magnetic units each, the plurality of recesses of for covering all of the openings, the upper surface of the supporting surface and has been made of a ferromagnetic material plate lid, and allowed placed on the support, their plate-shaped lid body support and the fixing means And fix it with
Further, an outer annular groove is provided on an upper surface portion of the plate-shaped lid corresponding to each peripheral edge of the plurality of recesses formed in the support, while an outer annular groove corresponding to the outer annular groove is provided. An inner annular groove is provided on a lower surface portion of the plate-shaped lid, and the outer and inner annular grooves respectively constitute the permanent magnets which are respectively housed in the plurality of recesses of the support. Forming a thinned portion of the plate-like lid at a portion located above the magnet,
And packing is accommodated in each of a plurality of inner annular grooves of the plate-like lid so that the plurality of recesses are sealed by the packing between the plate-like lid and the plurality of recesses, respectively. magnetic attraction and wherein the configuration was.

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