CN219819477U - Magnetic chuck - Google Patents

Abstract

The utility model discloses a magnetic chuck, which comprises a shell and a magnet arranged in the shell, wherein the shell comprises a panel, two side plates, two end plates and a bottom plate which are enclosed to form a hollow hexahedron, the magnet comprises an electromagnet arranged close to the panel and a permanent magnet arranged close to the bottom plate, the electromagnet comprises an electromagnetic coil and an iron core, the electromagnetic coil is connected with a control circuit, and the control circuit comprises a forward and reverse switching circuit connected between a power supply and the electromagnetic coil. The utility model has simple structure, simultaneously sets the electromagnet and the permanent magnet, realizes three modes of micromagnetic, ferromagnetic and demagnetizing by the power failure of the electromagnetic coil of the electromagnet and the forward and reverse switching of current, and is convenient for the accurate positioning and holding of thin parts.

Description

Magnetic chuck

Technical Field

The utility model relates to the technical field of machining, in particular to a magnetic chuck.

Background

The electromagnetic chuck is based on an electromagnetic principle, and generates magnetic force by electrifying an internal electromagnetic coil, the magnetic force passes through a magnetic conduction panel to tightly suck a workpiece contacting the surface of the panel, and the electromagnetic coil is powered off to eliminate the magnetic force so as to realize demagnetization; in the actual use process, after the electromagnetic coil is powered off, the contact panel and the workpiece have residual magnetism, so that the contact panel and the workpiece are required to be demagnetized, and reverse direct current is introduced into the electromagnetic coil of the electromagnetic chuck to demagnetize the contact panel and the workpiece, but the demagnetization time cannot be judged, so that the demagnetization is incomplete or reverse magnetization is caused; in addition, after the workpiece is tightly sucked by the touch panel, the fixing position cannot be adjusted, the workpiece needs to be accurately positioned before magnetizing, the workpiece cannot be completely fixed without magnetizing, and therefore, a plurality of people are required to cooperate or use an external clamp and the like, and the use cost is increased. Accordingly, improvements are needed.

Disclosure of Invention

The utility model aims to provide a magnetic chuck which overcomes the defects in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the embodiment of the utility model discloses a magnetic chuck, which comprises a shell and a magnet arranged in the shell, wherein the shell comprises a panel, two side plates, two end plates and a bottom plate which are enclosed to form a hollow hexahedron, the magnet comprises an electromagnet arranged close to the panel and a permanent magnet arranged close to the bottom plate, the electromagnet comprises an electromagnetic coil and an iron core, the electromagnetic coil is connected with a control circuit, and the control circuit comprises a forward and reverse switching circuit connected between a power supply and the electromagnetic coil.

Further, in the magnetic chuck, the panel includes two magnetically conductive panels disposed at intervals and a magnetically insulating panel disposed between the two magnetically conductive panels.

Further, in the magnetic chuck, the two magnetically conductive panels are symmetrically arranged at two sides of the magnetism isolating panel.

Further, in the magnetic chuck, the inner walls of the two side plates are respectively provided with a clamping groove corresponding to the permanent magnet.

Further, in the magnetic chuck, a threading hole is provided in one of the end plates.

Further, in the magnetic chuck described above, the bottom plate is made of a non-magnetic material.

Further, in the magnetic chuck, the bottom plate is an aluminum bottom plate.

Compared with the prior art, the utility model has the advantages that: this magnetic chuck simple structure sets up electro-magnet and permanent magnet simultaneously, and the permanent magnet sets up away from the panel, makes the panel adsorb the work piece, does not hinder the slip of work piece again, through the positive and negative switching of the loss of electricity and the electric current of electro-magnet solenoid, realizes little magnetism, strong magnetism and three kinds of modes of loss of magnetism, makes things convenient for the accurate location of slim part to hold.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.

FIG. 1 is a schematic view of a magnetic chuck according to an embodiment of the utility model.

FIG. 2 is a schematic diagram of the interior of a magnetic chuck according to an embodiment of the utility model.

Fig. 3 is a schematic structural diagram of a panel according to an embodiment of the utility model.

Fig. 4 is a schematic diagram of a control circuit according to an embodiment of the utility model.

FIG. 5 is a schematic circuit diagram of a ferromagnetic state according to an embodiment of the present utility model.

FIG. 6 is a schematic circuit diagram of a loss of magnetic field state according to an embodiment of the utility model.

Detailed Description

The following detailed description of the technical solutions according to the embodiments of the present utility model will be given with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 to 6, a magnetic chuck includes a housing and a magnet disposed in the housing, the housing includes a panel 10, two side plates 20, two end plates 30 and a bottom plate 40 enclosing a hollow cuboid, the magnet includes an electromagnet 50 disposed near the panel 10 and a permanent magnet 60 disposed near the bottom plate 40, the electromagnet 50 includes an electromagnetic coil 51 and an iron core, the electromagnetic coil 51 is connected to a control circuit, and the control circuit includes a forward/reverse switching circuit connected between a power supply and the electromagnetic coil 51.

In the technical scheme, the structures of the electromagnet and the permanent magnet belong to the prior art, and the structures of the panel, the side plate, the end plate and the bottom plate are not expanded one by one, and the connection of the panel, the side plate, the end plate and the bottom plate can be realized through conventional structures such as screws, and the magnetic attraction of the magnet is in inverse proportion to the distance, so that the permanent magnet is arranged on one side far away from the panel, and the magnetic attraction of the permanent magnet at the panel is controlled through the distance, so that when the electromagnet is not electrified, the permanent magnet can enable the panel to adsorb a workpiece and prevent the workpiece from sliding, and the workpiece is in a micro-magnetic state at the moment, thereby being convenient for adjusting the position of the workpiece, and the position can not change after adjustment; the electromagnet is electrified in the forward direction (the flow direction in the electromagnetic coil is in the forward direction according to the magnetic pole arrangement of the permanent magnet, and magnetic force lines in the same direction as the permanent magnet can be generated), so that the magnetic attraction force at the panel is enhanced, the electromagnet is arranged close to the panel, the magnetic attraction force at the panel is larger than the magnetic attraction force of the permanent magnet at the panel, the workpiece is completely fixed in a strong magnetic state, and the magnetic attraction force at the panel is larger than twice the magnetic attraction force of the permanent magnet at the panel; after the processing is finished, the electromagnet is connected with a reverse current and generates a magnetic field direction opposite to that of the permanent magnet, magnetic force lines of the electromagnet and the permanent magnet form an internal closure, no magnetic force lines pass through the panel and the workpiece, the workpiece is in a loss-of-magnetic state, and the workpiece can be taken out freely; the forward and reverse switching circuit realizes control by utilizing the interlocking of two contactors, a button SB1 is pressed, a coil of the contactor KM1 is electrified, an auxiliary normally-closed point of the contactor KM1 is disconnected, so that the contactor KM2 cannot work, and the contactors KM1 and KM2 form electrical interlocking; the normally open point of the contactor KM1 is closed to supply power to the electromagnetic coil, so that after the button SB1 is released, the KM1 continuously works in a self-locking mode, the main contact is closed, the electromagnetic coil is powered positively, the magnetic force lines of the electromagnet are consistent with the magnetic force lines of the permanent magnet, a strong magnetic state is formed, a workpiece is adsorbed, and the fixing strength is ensured; after the workpiece is machined, a button SB3 is pressed firstly, an electromagnetic coil of an electromagnet is deenergized, then SB2 is pressed, a contactor KM2 is self-locked, a main contact is closed, the electromagnetic coil is reversely electrified, the normally closed point of KM2 is disconnected, so that KM1 cannot work, the magnetic force lines of the electromagnet and the magnetic force lines of a permanent magnet form internal closure, the demagnetized state is achieved, and the machined workpiece can be freely taken down; before being electrified, the electromagnet is not effective, only the permanent magnet acts on the panel, the workpiece is adsorbed on the surface of the panel and can slide along the surface of the panel so as to adjust the fixed position of the workpiece; this magnetic chuck simple structure sets up electro-magnet and permanent magnet simultaneously, and the permanent magnet sets up away from the panel, makes the panel adsorb the work piece, does not hinder the slip of work piece again, through the positive and negative switching of the loss of electricity and the electric current of electro-magnet solenoid, realizes little magnetism, strong magnetism and three kinds of modes of loss of magnetism, makes things convenient for the accurate location of slim part to hold.

As shown in fig. 1 to 3, the panel 10 includes two magnetically conductive panels 11 disposed at a distance from each other and a magnetism isolating panel 12 disposed between the two magnetically conductive panels 11.

According to the technical scheme, the copper magnetism isolating panels are used for arranging the magnetism conducting panels at intervals, so that magnetic force lines return to the magnetism conducting panels through the workpiece, and the magnetic force lines cannot be directly closed through the panels, so that the holding force on the workpiece is enhanced.

As shown in fig. 1 to 3, two magnetically conductive panels 11 are symmetrically disposed on both sides of a magnetically insulating panel 12.

In the technical scheme, a counter bore is machined in one magnetic conduction panel, a corresponding threaded hole is machined in the other magnetic conduction panel, a corresponding through hole is machined in the magnetic isolation panel, and the two magnetic conduction panels and the magnetic isolation panel are fixed into a whole through bolts and the like.

Illustratively, referring to fig. 2, the inner walls of the two side plates 20 are respectively provided with a clamping groove 21 corresponding to the permanent magnet 60.

In this technical scheme, a plurality of permanent magnets set up along draw-in groove length direction equidistant interval, guarantee that panel length direction all has sufficient magnetic attraction, every permanent magnet has the conventional magnet steel of polylith to pile up and form, and mutually fix through the attractive force between each other, the corresponding position of rear end embedding draw-in groove, after curb plate is fixed in panel and bottom plate, with the permanent magnet chucking between the both sides board, guarantee its fixed strength, the magnet steel need not to process mounting hole etc. to guarantee its magnetic attraction, under the circumstances of equal magnetic attraction, be favorable to miniaturized design, the electro-magnet is fixed through conventional modes such as gluey or setting locating pin (not shown) in the curb plate, just not expand here and detail.

Illustratively, referring to fig. 1 and 2, one of the end plates 30 has a threading aperture 31 disposed therein.

In this technical scheme, electromagnetic coil is led outside the casing through the through wires hole, and control circuit etc. sets up in the control box, wholly sets up outside the casing, avoids magnet to influence use such as contactor, and control circuit can also directly insert in the control box of corresponding processing equipment, and through wires hole department can set up corresponding plug, and electromagnetic coil directly peg graft in control circuit.

Illustratively, the base plate 40 is made of a non-magnetic material such as metallic aluminum.

In the technical scheme, magnetic force lines of the magnet are prevented from being directly closed from the bottom plate.

To sum up, this magnetic chuck simple structure sets up electro-magnet and permanent magnet simultaneously, and the permanent magnet sets up away from the panel, makes the panel adsorb the work piece, does not hinder the slip of work piece again, through the positive reverse switching of the outage and the electric current of electro-magnet solenoid, realizes little magnetism, strong magnetism and three kinds of modes of loss of magnetism, makes things convenient for the accurate location of slim part to hold.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

The foregoing is merely exemplary of the utility model and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the utility model, and it is intended that the utility model also be limited to the specific embodiments shown.

Claims (7)

1. The utility model provides a magnetic chuck, its characterized in that includes the casing and sets up the magnet in the casing, the casing is including enclosing into hollow hexahedral panel, two curb plates, two end plates and bottom plate, the magnet is including being close to the electro-magnet of panel setting and being close to the permanent magnet that the bottom plate set up, the electro-magnet includes solenoid and iron core, solenoid connects in control circuit, control circuit is including connecting the forward and reverse switching circuit between power and solenoid.

2. The magnetic chuck as set forth in claim 1, wherein: the panel comprises two magnetic conduction panels arranged at intervals and a magnetic isolation panel arranged between the two magnetic conduction panels.

3. The magnetic chuck as set forth in claim 2, wherein: the two magnetic conductive panels are symmetrically arranged on two sides of the magnetic isolation panel.

4. The magnetic chuck as set forth in claim 1, wherein: the inner walls of the two side plates are respectively provided with clamping grooves corresponding to the permanent magnets.

5. The magnetic chuck as set forth in claim 1, wherein: a threading hole is arranged in one end plate.

6. The magnetic chuck as set forth in claim 1, wherein: the base plate is made of a non-magnetic material.

7. The magnetic chuck as in claim 6, wherein: the bottom plate is an aluminum bottom plate.