JP2010254438A - Method and device of separating sheet-like magnetic material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device of separating a sheet-like magnetic material for precisely floating and separating the sheet-like magnetic material tangled with burrs. <P>SOLUTION: This method is provided for floating and separating the sheet-like magnetic material S stacked by intermittently exciting separating electromagnets 5 and 5 arranged on both sides of the stacked sheet-like magnetic material S via a partition frame 4 composed of a nonmagnetic substance by a predetermined frequency. This device is composed of the separating electromagnets 5 and 5 arranged on both sides of the sheet-like magnetic material S stacked on a receiving table 3 via the partition frame 4 of the nonmagnetic substance and a power circuit 50 for intermittently exciting the separating electromagnets 5 and 5 by the predetermined frequency so that the sheet-like magnetic material S floats and separates, and can surely attract only one sheet without simultaneously attracting a plurality of sheets. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sheet-like magnetic material separation method and apparatus for separating sheet-like magnetic materials such as wire meshes or steel plates that have been press-cut into a predetermined shape and stacked one by one.

  Conventionally, as an apparatus for separating the stacked sheet materials one by one, the end portion of the sheet material is excited to a certain magnetic pole by bringing a permanent magnet into contact with the end portion of the sheet material, and stacking is performed by the excitation force. Some sheet materials are repelled and separated (see, for example, Patent Document 1).

  However, since it is a permanent magnet, the permanent magnet is provided with an excitation part and a non-excitation part, and is made rotatable so that the sheet material is brought into contact with the excitation part and separated by repulsion, and then rotated to de-excitation the sheet material. It was necessary to solve the adsorption by the excitation part by contacting the part. In addition, when the sheet materials are entangled with each other due to burrs or the like generated at the edge of the press-cut sheet material, there is a problem that repulsion separation by the excitation unit cannot be performed.

JP-A-5-318000

  It is an object of the present invention to provide a sheet-like magnetic material separation method and apparatus for accurately levitating and separating a sheet-like magnetic material entangled with burrs or the like.

  The present invention provides a sheet-like magnetic material that is stacked by intermittently exciting separation electromagnets arranged on both sides of a laminated sheet-like magnetic material via a partition frame made of a non-magnetic material at a predetermined frequency. Invention, a separation electromagnet disposed on both sides of a sheet-like magnetic material stacked on a cradle via a non-magnetic partition frame, and a sheet-like magnetic material It is an invention of an apparatus characterized by comprising a power supply circuit that intermittently excites the separating electromagnet at a predetermined frequency so as to be separated.

  In the invention of the apparatus, the uppermost sheet-like magnetic material placed on the cradle is positioned near the magnetic field center of the separation electromagnet when the separation electromagnet is not excited, or the sheet-like magnetic material A top / bottom surface that is lifted and separated above the cradle, or a lifting / lowering mechanism that is raised by the thickness of the sheet-like magnetic material that has been taken out each time one or more of A pick-up lifter equipped with an adsorption electromagnet that adsorbs the sheet-like magnetic material, or a connection checker detection terminal between the adsorption electromagnet of the extraction lifter and the partition frame, or between a plurality of adsorption electromagnets of the extraction lifter Or an excitation coil for generating a high-frequency magnetic field is arranged close to one end face of the sheet-like magnetic material adsorbed by the suction electromagnet of the take-out lifter. The eddy current type thickness detection mechanism detecting coil was placed close to detect the impedance of the sheet-like magnetic material on the other end surface may be or to that provided for direction.

  The present invention provides a sheet-like magnetic material that is stacked by intermittently exciting separation electromagnets arranged on both sides of a laminated sheet-like magnetic material via a partition frame made of a non-magnetic material at a predetermined frequency. By floating and separating, a plurality of sheets are not adsorbed at the same time, and only one can be surely adsorbed. Further, even if the upper and lower sheet-like magnetic materials are entangled by burrs or the like, the sheet-like magnetic materials are accurately separated and can be taken out one by one.

  Further, as in claim 3, when the uppermost sheet-like magnetic material placed on the cradle is not energized with the separation electromagnet, it is positioned near the magnetic field center of the separation electromagnet. Since the sheet-like magnetic material is strongly excited, the repulsive force is increased and the sheet-like magnetic material can be levitated and separated more accurately.

  Further, as described in claim 4, each time one or a plurality of sheet-like magnetic materials are taken out, a lifting mechanism that raises the sheet-like magnetic material by the thickness of the taken-out magnetic material is attached to the cradle. Since the sheet-like magnetic material is always located near the center of the magnetic field and receives the strongest repulsive force, only one sheet-like magnetic material can be reliably separated.

  The sheet-like magnetic material is perforated by disposing a take-out lifter having an adsorption electromagnet for adsorbing the uppermost sheet-like magnetic material that is levitated and separated above the cradle, as in claim 5. Even if it is a thing or a wire mesh, it can be taken out reliably.

  The sheet-like magnetic material is adsorbed on the take-out lifter by providing a detection terminal of the conduction checker between the pick-up lifter electromagnet and the partition frame or between the pick-up lifter electromagnets. Therefore, it is possible to reliably check that there is a problem, so that it is possible to prevent idle feeding and eliminate the trouble in the next process.

  As in claim 7, an excitation coil for generating a high frequency magnetic field is arranged close to one end face of the sheet-like magnetic material adsorbed by the attracting electromagnet of the take-out lifter, and the other end face of the sheet-like magnetic material is opposed to the other side face. The detection sensitivity fluctuates even if the position of the sheet-like magnetic material S moves between the excitation coil and the detection coil by providing an eddy current type thickness detection mechanism in which a detection coil for detecting the impedance of the sheet-like magnetic material is arranged close to each other. Therefore, it is possible to reliably detect a plurality of overlapping sheet-like magnetic materials.

It is the schematic which shows embodiment of the separation apparatus of this invention. It is explanatory drawing which shows the principle by which a sheet-like magnetic material is floated and separated. It is the schematic which shows the other Example of a continuity checker. It is the schematic which shows the Example which provided the eddy current type thickness detection mechanism. It is a time chart figure of a separator.

Next, when pouring the present invention, a metal mesh (sheet-like magnetic material) as a filter attached to the gate is separated and attached to the gate so that impurities such as molten slag do not enter the mold. This will be described in detail based on the apparatus.
Reference numeral 1 denotes a separation device that separates a plurality of stacked sheet-like magnetic materials S one by one, and the sheet-like magnetic material S is a wire net punched into a predetermined shape by a press. The separation device 1 is provided with a sheet lifter 2 for taking out the sheet-like magnetic material S, a receiving table 3 on which the sheet-like magnetic material S is stacked and placed, and a partition frame 4 made of a nonmagnetic material on both sides of the receiving table 3. Separating electromagnets 5 and 5, and an electric gripper 6 of a robot arm that receives the sheet-like magnetic material from the take-out lifter 2 and conveys it to the pouring gate of the mold.

  The take-out lifter 2 is attached to a column 21 on a base 20 via a linear bearing, and can be moved up and down by an elevating mechanism 23 provided between the arm 22 and the base 20. The elevating mechanism 23 includes an electric large cylinder 23a having a long stroke approaching the cradle 3 and an electric small cylinder 23b having a short stroke for performing the adsorption operation of the sheet-like magnetic material S. The electric large cylinder 23a limits the upper limit and the lower limit. It is set by the switches LS3 and LS4. The electric small cylinder 23b has an upper limit and a lower limit set by limit switches LS1 and LS2. By making the elevating mechanism 23 consist of a long electric large cylinder 23a and an electric small cylinder 23b, high speed driving and low speed driving can be achieved without incorporating an expensive control circuit.

  Reference numeral 24 denotes a plurality of attracting electromagnets attached to the lower end of the arm 22 of the take-out lifter 2 via an insulator, and the attracting electromagnets 24 match the timing of attracting the sheet-like magnetic material S from the cradle 3. Then, the power supply 24a is turned on, and the power supply 24a is turned off in accordance with the timing of handing to the electric gripper 6. 25 is a continuity checker, and the continuity checker 25 is connected to each of the adsorbing electromagnets 24 separated by a detection terminal to which a voltage of 24 V is applied via a transformer 25a that steps down the AC 100 to 24 V, and one wiring When the sheet-like magnetic material S is attracted to the attracting electromagnet 24, the detection terminal is conducted through the sheet-like magnetic material S. It is possible to detect whether or not the sheet-like magnetic material S has been adsorbed by detecting an output signal from the relay 25b that operates by this conduction.

  A brake 26 is provided in the lifting mechanism 23 of the take-out lifter 2. The brake 26 improves the stop position accuracy of the lifting mechanism 23.

  As shown in FIG. 3, the conduction checker 25 is provided between the partition frame 4 and one adsorption electromagnet 24, and when the sheet-like magnetic material S is adsorbed in the partition frame 4, the adsorption electromagnet 24 and the partition frame. Adsorption may be detected and confirmed by being conducted by the sheet-like magnetic material S in contact with 4.

  The cradle 3 is provided on the base 20 and is moved up and down by an elevating mechanism 30 comprising an electric cylinder controlled by a sequencer 31 and a controller 32. The elevating mechanism 30 takes out the sheet-like magnetic material S. After one or more sheets are taken out by the lifter 2, after a certain number of seconds have elapsed, the sheet-like magnetic material S is raised by the thickness of one or more sheets. By doing so, the uppermost sheet-like magnetic material S can be positioned in the vicinity of the magnetic field center of the separating electromagnet 5, so that the maximum repulsive force can always be given to the sheet-like magnetic material S and the separation can be ensured. Can be.

  The partition frame 4 surrounding the cradle 3 is made of non-magnetic stainless steel that can be electrically connected but is not excited, and the sheet-like magnetic material S is directly adsorbed by the separating electromagnets 5 and 5. In addition to preventing the occurrence of a takeout failure, it can also be used as a contact for the conduction checker 25.

  The electromagnets 5 and 5 for separation are arranged so that the uppermost sheet-like magnetic material S placed on the cradle 3 is positioned near the center of the magnetic field when not excited. The power supply circuit 50 connected to the separating electromagnets 5 and 5 intermittently excites the separating electromagnets 5 and 5 at a predetermined frequency. As shown in FIG. The end portions of the sheet-like magnetic material S are excited to the S pole, and the end portions of the respective sheet-like magnetic materials S facing the S pole side are excited to the N pole. As a result, each sheet-like magnetic material S separates and floats.

  Moreover, since this repulsive force is intermittently repeatedly applied to the sheet-like magnetic material S, the entanglement due to burrs is released, and the sheet-like magnetic material S is levitated and separated. The power source applied to the separating electromagnets 5 and 5 may be applied by applying a direct current in the form of a pulse or an alternating current. The frequency in the case of direct current is preferably 20 to 30 Hz, and the frequency in the case of alternating current is preferably 10 to 20 Hz. . If this frequency is too low, the amplitude of the sheet-like magnetic material S becomes too large, and the upper sheet-like magnetic material S may become oblique and pierce the lower sheet-like magnetic material S. On the other hand, if the frequency is too high, the amplitude becomes small and the separation becomes insufficient, and the power supply circuit 50 is difficult to design and increases in cost.

  The electric gripper 6 grips the end portion of one sheet-like magnetic material S that is attracted by the attracting electromagnet 24 of the take-out lifter 2 and lifted upward. A thickness detection mechanism 60 that detects the thickness of the magnetic material S is incorporated.

  The thickness detection mechanism 60 performs position control by performing closed loop control using a stepping motor and a rotary encoder. The thickness of the sheet-like magnetic material S is detected by detecting the movement of the stepping motor with the rotary encoder when the step-like motor is operated to chuck the sheet-like magnetic material S. The detected thickness signal is the controller 61. The thickness is displayed numerically and input to the sequencer 62. Based on this thickness signal, the sequencer 62 determines whether the sheet-like magnetic material S being chucked is one sheet or a plurality of sheets.

  In order to attach the wire mesh as the sheet-like magnetic material S to the gate of the mold, the sheet-like magnetic material S made of a wire mesh as a filter on the cradle 3 in the partition frame 4 is first constructed. . At this time, the height of the cradle 3 is adjusted via the elevating mechanism 30 so that the uppermost sheet-like magnetic material S is positioned near the magnetic field center of the separating electromagnets 5 and 5 when not excited.

  After feeding the sheet-like magnetic material S, the power supply circuit 50 is driven to apply a pulsed DC power source to the separating electromagnets 5 and 5 to excite them. For example, when the separation electromagnets 5 and 5 are turned on and off at a frequency of 15 Hz, as shown in FIG. 2, the end portions of the sheet-like magnetic material S facing the separation electromagnets 5 and 5 are excited to the same polarity.

  By this excitation, each sheet-like magnetic material S repels and floats by 1 to 2 mm. When the energization by the power supply circuit 50 is cut off, the excitation is released and the sheet-like magnetic material S is dropped by gravity and stacked on the sheet-like magnetic material S. When such vertical vibration is applied to the sheet-like magnetic material S, the entanglement of the sheet-like magnetic material S that are intertwined by burrs or the like is released and separated.

  Since the entanglement of the sheet-like magnetic material S is released by receiving such vibration, the electric large cylinder 23a of the elevating mechanism 23 is operated until it is stopped by LS3 as shown in the chart of FIG. 2 is lowered and the lowered position is maintained by the brake 26. This lowered position is a position where the sheet-like magnetic material S levitated by the separating electromagnets 5 and 5 is not attracted by the magnetized attracting electromagnet 24.

  When the lowering of the electric large cylinder 23a is stopped, the electric small cylinder 23b is driven, and the attracting electromagnet 24 is lowered until the operation is switched by LS2. At the lowered position of the electric small cylinder 23b, the sheet-like magnetic material S is adsorbed by the magnetic force of the adsorption electromagnet 24. Therefore, when the electric small cylinder 23b reaches the bottom dead center, the driving of the separation electromagnets 5 and 5 is stopped. Let As a result, the sheet-like magnetic material S is smoothly attracted to the attracting electromagnet 24. As shown in FIG. 5, by this suction, the conduction checker 25 is turned on and an ON signal is output, and the suction is confirmed.

  When the electric small cylinder 23b reaches the bottom dead center due to LS2, the electric small cylinder 23b reversely rises to the top dead center regulated by LS1. When the electric small cylinder 23b rises, the brake 26 is turned off, and the electric large cylinder 23a rises to the top dead center due to LS4. Thereby, the sheet-like magnetic material S is raised to a predetermined position by the electromagnet 24 for adsorption.

  When the sheet-like magnetic material S stops at the raised position, the electric gripper 6 of the robot arm moves to a position where the sheet-like magnetic material S is gripped, and closes the electric gripper 6. Since the electric gripper 6 incorporates a thickness detection mechanism 60, the thickness of the sheet-like magnetic material S is detected. Based on the detected thickness, it is determined whether the sheet-like magnetic material S held by the electric gripper 6 is one sheet or plural sheets. Then, it is determined that one sheet is OK, and the robot arm attaches the sheet-like magnetic material S made of a wire mesh as a filter to the gate of the mold. If it is determined that there are a plurality of sheet-like magnetic materials S, the sheet-like magnetic material S is thrown away into the NG box.

  4 shows an eddy current type thickness detecting mechanism 70. The eddy current type thickness detecting mechanism 70 includes an exciting coil 72 that generates a high frequency magnetic field by flowing a high frequency current from a high frequency generating circuit 71. A detection coil 73 that is disposed close to the side end face and detects the impedance of the sheet-like magnetic material S is placed close to the other end face of the sheet-like magnetic material S, and the sheet is placed within the high-frequency magnetic field generated by the excitation coil 72. If the magnetic material S is present, an eddy current flows through the magnetic sheet S due to electromagnetic induction. Since this eddy current value is detected by the detection coil 73 as an impedance that changes depending on the thickness of the sheet-like magnetic material S, it is possible to detect whether the sheet-like magnetic material S is one sheet or a plurality of sheets. Since the excitation coil 72 and the detection coil 73 are separated, the detection sensitivity does not change even if the position of the sheet-like magnetic material S moves toward the excitation coil 72 or the detection coil 73. The thickness of the material S can be detected reliably and with high accuracy.

1 Separator 2 Take-out lifter
20 base
21 Prop
22 arm
23 Lifting mechanism
23a Electric large cylinder
23b Electric small cylinder
24 Electromagnet for adsorption
24a power supply
25 Continuity checker
25a battery
25b Voltmeter 3 cradle
30 Lifting mechanism
31 Sequencer
32 Controller 4 Partition frame 5 Electromagnet for separation
50 Power supply circuit 6 Electric gripper
60 Thickness detection mechanism
61 controller
62 Sequencer
70 Eddy current type thickness detection mechanism
71 High frequency generator
72 Excitation coil
73 Detector coil

Claims (7)

  A separation electromagnet disposed on both sides of the stacked sheet-like magnetic material via a partition frame made of a non-magnetic material is intermittently excited at a predetermined frequency to float and separate the stacked sheet-like magnetic material. A method for separating a sheet-like magnetic material.   The separation electromagnets disposed on both sides of the sheet-like magnetic material stacked on the cradle via the non-magnetic partition frame and the separation electromagnet intermittently at a predetermined frequency so that the sheet-like magnetic material floats and separates. An apparatus for separating a sheet-like magnetic material, characterized by comprising a power supply circuit for exciting.   3. The sheet-like magnetic material according to claim 2, wherein the uppermost sheet-like magnetic material placed on the cradle is positioned near the magnetic field center of the separation electromagnet when the separation electromagnet is not excited. Separation equipment.   4. A lifting mechanism that raises the sheet-like magnetic material by the thickness of the taken-out sheet-like magnetic material each time one or more of the sheet-like magnetic materials are taken out is attached to the cradle. Sheet-like magnetic material separator.   5. A sheet-like lifter having an adsorption electromagnet for adsorbing the uppermost sheet-like magnetic material that is levitated and separated is disposed above the cradle. Magnetic material separator.   6. The sheet-like magnetic material separating apparatus according to claim 5, wherein a detection terminal of a conduction checker is provided between the adsorption electromagnet of the take-out lifter and the partition frame or between the plurality of adsorption electromagnets of the take-out lifter.   An excitation coil that generates a high-frequency magnetic field is placed close to one end face of the sheet-like magnetic material adsorbed by the pick-up lifter electromagnet, and the impedance of the sheet-like magnetic material is placed on the opposite end face of the sheet-like magnetic material. 6. The sheet-like magnetic material separating apparatus according to claim 5, further comprising an eddy current type thickness detecting mechanism in which detection coils to be detected are arranged close to each other.

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