JP4926449B2 - Chip transport device - Google Patents

Description

  The present invention relates to a swarf conveying device that discharges swarf made of a magnetic material such as swarf or iron powder generated in a cutting operation or a grinding operation from a tank.

  Chips such as chips and iron powder scraped off by a molding machine such as a cutting machine or a grinding machine are collected in a tank using a coolant for cooling the molding machine. Since the coolant in the tank is circulated, it is usually circulated from the tank after removing the shavings so as not to include the shavings. Conventionally, as an apparatus for removing shavings in a tank, a chip / iron powder separation / removal device 50 as shown in FIGS. 8 and 9 is known. In this case, a so-called rotatable adsorption drum type oil separator 55 was used. As shown in Patent Document 1, the oil separator 55 has a large number of iron plates 57 installed on the inner wall surface of the suction drum 56, and permanent magnets 58 are installed opposite to the iron plates 57. The permanent magnet 58 is installed so as to be able to follow and rotate on the iron plate 57 that is rotated by the rotation of 56. Further, an electromagnet 59 is installed at a predetermined position inside the attracting drum 56 so as to face the iron plate 57 as a demagnetizing device for demagnetizing the iron plate 57 magnetized by the permanent magnet 58.

  As shown in FIG. 9, the chip / iron powder separation / removal device 50 that uses the oil separator 55 normally divides the tank 51 into a chip / iron powder recovery unit 52 and a coolant feed unit 53. In addition, the oil separator 55 is disposed on the chip / iron powder recovery unit 52 side. The chips and iron powder collected in the tank 51 together with the circulating coolant from the molding machine 54 such as a cutting machine or a grinding machine are adsorbed to the adsorption drum 56 by the permanent magnet 58 by the oil separator 55, and in the chute part. Discharged.

As a result, the coolant from which the chips and iron powder have been removed is returned to the coolant supply unit 53, and the coolant is circulated from the tank 51 into the molding machine 54.
Japanese Patent Laid-Open No. 5-57211 (refer to pages 2 and 3 and FIG. 1)

  However, since the oil separator 55 described in Patent Document 1 uses a rare earth magnet, the oil separator 55 has a large magnetic force and is configured in a complicated manner, resulting in high costs. In addition, the chip / iron powder separation and removal device 50 using the oil separator 55 is configured to divide the tank 51 into two parts and to return the chip / iron powder from the cutting board 54 to the tank 51, and the tank 51. Since the pump 61 for sucking the inside chips and iron powder into the oil separator 55 is provided, the number of parts is large and the cost is high. Moreover, since the movable part is provided in the suction drum 56, it is necessary to perform maintenance, which is troublesome.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a swarf conveying apparatus that has a simple configuration and is inexpensive and can be performed maintenance-free. Furthermore, the present invention can save power consumption while maintaining the conveyance efficiency in view of the fact that no shavings are generated when the workpiece is attached and detached in the molding machine, and the necessity of conveying and removing the shavings is scarce. It aims at providing a shavings conveyance apparatus.

The shavings conveying apparatus according to the present invention includes an iron core having a main body arranged along the conveying direction of the shavings and provided with a groove in the conveying direction, and a conveying direction for each phase and for each set. A three-phase coil consisting of a plurality of sets wound around the groove of the iron core at different positions, and a three-phase coil that generates a variable magnetic field by flowing a three-phase alternating current,
In the swarf conveying apparatus comprising the apparatus main body and a voltage application circuit for applying a three-phase voltage to the three-phase coil, and conveying the swarf of the magnetic material by a variable magnetic field,
The U-phase coil, V-phase coil, and W-phase coil in the plurality of sets of three-phase coils are wound with the same-phase coils of the same phase of each adjacent set inserted into the same iron core groove. , Wound so that the winding direction of the different phase in-phase coils inserted in the same groove is the same direction,
The voltage application circuit includes:
When conveying the shavings, the three-phase voltage is higher than when the conveyance is interrupted, and the conveyance is performed while magnetically adhering the shavings to the immovable conveyance surface by the varying magnetic field generated by the three-phase alternating current flowing in the three-phase coil. When a three-phase voltage that enables conveyance in the direction is applied to the three-phase coil and the chip conveyance is interrupted, the three-phase voltage or DC voltage that is lower than that during the conveyance, A tap changer or inverter that switches the tap of the transformer circuit and supplies power to the three-phase coil so that a three-phase voltage or a DC voltage that can be held on the immobile conveyance surface is applied to the three-phase coil. Prepared,
The apparatus main body is divided into a plurality of unit blocks, and the voltage application circuit is provided in one-to-one correspondence with each unit block.

According to the shavings transport device of the present invention, the shavings are transported and discharged using the variable magnetic field generated by the three-phase coil. Therefore, the shavings transporting device can be configured with a simple structure at a low cost and has a movable part. Because it is not, maintenance-free is possible. Furthermore, in the chip conveying apparatus of the present invention, the U-phase coil, the V-phase coil, and the W-phase coil in the plurality of sets of three-phase coils each have the same iron core in the same-phase coil of the same phase in each adjacent group. Since it is inserted into the groove and wound, and the winding direction of different sets of in-phase coils inserted into the same groove is wound in the same direction, a plurality of sets of three-phase coils are arranged in the conveying direction. In this case, the stagnation of the shavings can be prevented at a location where each set coil is adjacent, and the coil can be smoothly conveyed.
In addition, the three-phase coil can be applied with a three-phase voltage or a DC voltage that enables magnetically attracted shavings to be held on the immobile transport surface, so there is a need to transport and discharge the shavings when removing and attaching workpieces. Compared with the case where a three-phase voltage is constantly applied to a three-phase coil when it is scarce, power consumption is reduced, power saving can be achieved, and coil burning can be suppressed.

Further, the apparatus main body is divided into a plurality of unit blocks, set the voltage application circuit in a one-to-one correspondence to each unit block only, since combining unit block any number of long conveying path and a short conveyance path Ru can be created arbitrarily. Moreover, since the provision of the voltage application circuit for each unit block, it is possible applying different voltages to each unit block, that Do the various transporting configuration can be realized.

  FIG. 1 shows a schematic configuration diagram of a shavings separating and transporting system in which a shavings transporting apparatus according to an embodiment of the present invention is incorporated.

  In FIG. 1, a shavings separating and conveying system 1 includes a molding machine 2 (a grinding machine in FIG. 1) such as a cutting machine or a grinding machine, and a pump 4 for supplying a coolant 7 in a tank 3 to the grinding machine 2. The tank 3 collects magnetic shavings such as iron powder generated by grinding the grinding material (work) with the coolant 7 and the grinding machine 2, and one end is disposed in the tank 3 and the other end is outside the tank 3. The swarf conveying device 10 for transporting the shavings in the tank 3 in the direction of the arrow a and discharging it to the outside, and the coolant supply path for supplying the coolant 7 in the tank 3 to the grinding machine 2 5 and a coolant / scrap recovery path 6 for recovering the coolant 7 and shavings from the grinding machine 2 into the tank 3.

  As shown in FIGS. 2 and 3, the main body 45 of the swarf conveying apparatus 10 is composed of three-phase coils, that is, U-phase coils 11A, 11B, 11C,..., V-phase coils 12A, 12B, 12C,. The iron core 14 wound with 13A, 13B, 13C,... Is housed in a sealed case body 15. The iron core 14 is formed by laminating magnetic steel silicon steel plates or iron plates in the width direction. On the upper surface of the iron core 14, a plurality of grooves 16, 17, 18, 19, 20, 21,... Are formed side by side.

  As shown in FIG. 2, the U-phase coil 11A passes through the grooves 16 and 19, the W-phase coil 13A passes through the grooves 17 and 20, and the V-phase coil 12A passes through the grooves 18 and 21. Further, the U phase coil 11B (see FIG. 3) adjacent to the left side of the U phase coil 11A passes through the groove 19 and the U phase coil 11A is connected to the W phase coil 11A. Further, the W-phase coil 13B (see FIG. 3) adjacent to the left side of the W-phase coil 13A also passes through the groove 21, and the V-phase coil 12B adjacent to the left side of the V-phase coil 12A connected to the V-phase coil 12A ( 3), and the U phase coil 11C (see FIG. 3) on the right side of the U phase coil 11A connected to the U phase coil 11A also passes in the groove 16, and in the groove 17 the W phase. The W-phase coil 13C (see FIG. 3) on the right side of the W-phase coil 13A connected to the coil 13A also passes, and in the groove 18 is on the right side of the V-phase coil 12A connected to the V-phase coil 12A. The V-phase coil 12C (see FIG. 3) also passes.

  The winding directions of U, V, and W phase coils 11A, 12A, and 13A constituting one set of coil sets 22A (corresponding to the arrow directions of the coils in FIG. 3) are the same. Further, the winding directions of the U, V, and W phase coils 11B, 12B, and 13B constituting the left adjacent coil 22B of the set coil 22A are the same, and the right side of the set coil 22A The winding directions of the U, V, and W phase coils 11C, 12C, and 13C constituting the adjacent assembled coil 22C are also in the same direction. Further, in FIG. 3, the winding directions of the U, V, and W phase coils 11D, 12D, and 13D that constitute the left adjacent set coil 22D of the set coil 22B are also the same. Also, between the adjacent coil sets 22A and 22B, between 22A and 22C, and between 22B and 22D, the winding directions are opposite to each other as shown in FIG. As shown in FIG. 3, the winding start of the U-phase coil 11C and the winding start of the V-phase coil 12C are respectively connected to the power supply side (voltage application circuit 30), but the winding end of the W-phase coil 13C is ended. It is connected to the power supply side (voltage application circuit 30).

  As described above, the three-phase coil includes four sets of coil sets 22A, 22B, 22C, and 22D that are wound around the iron core 14 by shifting the position in the transport direction a for each phase and for each set.

  A voltage application circuit 30 is connected to the U-phase coil 11C, the V-phase coil 12C, and the W-phase coil 13C, and a three-phase AC power supply 40 is connected to the voltage application circuit 30.

  4 shows a configuration of an example of the voltage application circuit 30, and FIG. 5 shows a configuration of another example of the voltage application circuit 30.

  4 and 5, the voltage application circuit 30 includes a transformer circuit 32 or an inverter 33. As shown in FIG. 6, the transformer circuit 32 and the inverter 33 are used as they are without stepping down the three-phase voltages (200 V rated voltage) Vu1, Vv1, Vw1 of the three-phase AC power supply 40, and the U, V, and W phase coils 11C, 12C, 13C, and the low three-phase voltage (low voltage) Vu2 after stepping down the three-phase voltages Vu1, Vv1, and Vw1 of the three-phase AC power supply 40 based on the switching of the tap 34 or the command signal of the voltage command circuit 35. Vv2 and Vw2 are applied to the U, V, and W phase coils 11C, 12C, and 13C.

  The case body 15 is made of, for example, stainless steel, such as a non-magnetic material or a weak magnetic material having a high electric resistance, and the U-phase coils 11A, 11B, 11C,..., The V-phase coils 12A, 12B, 12C,. Above the coils 13A, 13B, 13C,.

  Next, the operation | movement or effect | action of the shavings separation conveyance system 1 comprised as mentioned above is demonstrated.

  When the magnetic shavings in the coolant 7 in the tank 3 are separated and transported, the voltage application circuit 30 does not step down the three-phase voltage (200V rated voltage) Vu1, Vv1, Vw1 of the three-phase AC power source 40, and , V and W phase coils 11C, 12C and 13C.

  The set coils 22A, 22B, 22C, and 22D to which the three-phase voltages (200V rated voltage) Vu1, Vv1, and Vw1 are applied generate a varying magnetic field, and the combined magnetic field in the coolant 7 A moving magnetic field for magnetically adsorbing magnetic chips and transporting in the transport direction a is formed. This moving magnetic field is conceptually composed of the magnetic poles of the teeth 23, 24, 25, 26, 27, 28, 29,... Of the iron core 14 in order of N pole, S pole, N pole, S pole,. The magnetic chips are moved in the transport direction a while being magnetically attracted to the transport surface 15a of the case body 15 by being alternately reversed toward the transport direction a. And the magnetic shavings conveyed on the conveyance surface 15a are collect | recovered by the collection | recovery part which is not shown in figure from the terminal part of the case body 15. FIG.

  When the workpiece set on the grinding machine 2 is to be attached or detached during the transfer of the magnetic shavings, the three phases of the three-phase AC power supply 40 are switched based on the switching of the tap 34 or the command signal of the voltage command circuit 35 in the voltage application circuit 30. Low three-phase voltages (low voltages) Vu2, Vv2, and Vw2 after stepping down the voltages Vu1, Vv1, and Vw1 are applied to the U, V, and W-phase coils 11C, 12C, and 13C. The low voltages Vu2, Vv2, and Vw2 are set to such a magnitude that the magnetic shavings magnetically attracted to the transport surface 15a are not detached from the transport surface 15a, and the magnetic shavings are hardly transported. The Accordingly, when the low voltages Vu2, Vv2, and Vw2 are applied, the magnetic shavings are held on the transport surface 15a, and the workpiece is attached and detached under this state.

  As described above, the shaving carrier device 10 according to the present embodiment includes the device main body 45 and the voltage application circuit 30, and the device main body 45 is disposed along the shaving conveyance direction a. And three-phase coils 22A, 22B, 22C, and 22D that are wound around the iron core 14 by shifting the position in the transport direction a for each phase and for each set, and the three-phase alternating current is A three-phase coil 22A, 22B, 22C, 22D that generates a variable magnetic field by flowing, and a voltage application circuit 30 that applies a voltage to the three-phase coil 22A, 22B, 22C, 22D. When transporting the shavings, the three-phase voltages Vu1, Vv1, and Vw1 are higher than when the transport is interrupted, and the shavings are generated by the fluctuating magnetic field generated by the three-phase alternating current flowing through the three-phase coils 22A, 22B, 22C, and 22D. Magnetism on the immovable transfer surface 15a When three-phase voltages Vu1, Vv1, and Vw1 that enable conveyance in the conveyance direction a while adsorbing are applied to the three-phase coils 22A, 22B, 22C, and 22D and the conveyance of the shavings is interrupted, it is lower than that during conveyance. Three-phase voltages Vu2, Vv2, and Vw2, which are phase voltages Vu2, Vv2, and Vw2, that enable magnetically attracted shavings to be held on the immobile conveyance surface 15a, are applied to the three-phase coils 22A, 22B, 22C, and 22D. .

  According to the shavings transport device 10 of the present embodiment, the shavings are transported and discharged using the fluctuating magnetic fields generated by the three-phase coils 22A, 22B, 22C, and 22D, so that the configuration is simple and inexpensive. In addition, since there is no movable part, maintenance-free operation is possible. Furthermore, the three-phase coils 22A, 22B, 22C, and 22D are configured to be able to apply the three-phase voltages Vu2, Vv2, and Vw2 that enable the magnetically attracted shavings to be held on the non-moving transport surface 15a. Compared with the case where high three-phase voltages Vu1, Vv1, and Vw1 are continuously applied to the three-phase coils 22A, 22B, 22C, and 22D when the need for conveying and discharging the shavings is low, the power consumption is reduced and the power consumption is reduced. Electricity can be achieved and coil burnout can be suppressed.

  In the shavings conveying apparatus 10 according to the above-described embodiment, the three-phase coils 22A, 22B, 22C, and 22D are used as the coils. However, a two-phase coil or the like may be used instead. That is, the coil may be an n-phase coil (n: an integer of 2 or more), and in that case, the voltage applied to the coil is an n-phase voltage. Further, the configuration as shown in FIG. 3 is not required to be provided over the entire length of the transport surface 15a in the transport direction a, and the portion immersed in the coolant 7 of the tank 3 is a separate configuration, that is, a DC voltage is applied to the coil. Then, it may be configured to generate a fixed magnetic field that only captures the magnetic shavings and does not carry it. Similarly, at the end portion in the carrying direction a, the magnetic attraction force is gradually reduced so that the magnetic shavings are carried on the carrying surface 15a. It is good also as a structure which can fall from. Further, when the conveyance is interrupted, a low DC voltage may be applied to the three-phase coils 22A, 22B, 22C, and 22D so that the magnetically attracted shavings can be held on the immobile conveyance surface 15a.

  FIG. 7 shows a schematic configuration of a shaving carrier device 10 according to another embodiment.

  In FIG. 7, the apparatus main body 45 is configured by connecting a plurality of unit blocks 46A, 46B, 46C in the transport direction a. Each unit block 46A, 46B, 46C is configured in the same manner as the apparatus main body 45 shown in FIGS. 1 to 3, and the three-phase coils 22A, 22B, 22C, 22D of the apparatus main body 45 shown in FIGS. Although not necessarily the same number, an iron core around which a plurality of sets of three-phase coils are wound is housed in a sealed case body. Further, voltage application circuits 30A, 30B, and 30C configured similarly to the voltage application circuit 30 illustrated in FIG. 4 or 5 are connected to the unit blocks 46A, 46B, and 46C. Each voltage application circuit 30A, 30B, 30C applies the three-phase voltages Vu1, Vv1, Vw1 to the corresponding three-phase coils of the unit blocks 46A, 46B, 46C when conveying the shavings. The three-phase voltages Vu1, Vv1, and Vw1 have voltage levels that enable the chips to be conveyed in the conveyance direction a while being magnetically attracted to the immobile conveyance surfaces 15a, 15b, and 15c by the varying magnetic field generated by the three-phase coil. Each voltage application circuit 30A, 30B, 30C applies the three-phase voltages Vu2, Vv2, Vw2 to the corresponding three-phase coils of the unit blocks 46A, 46B, 46C when the conveyance of the shavings is interrupted. The three-phase voltages Vu2, Vv2, and Vw2 are lower than the three-phase voltages Vu1, Vv1, and Vw1 at the time of conveyance, and have a voltage level that enables magnetically attracted shavings to be held on the immobile conveyance surfaces 15a, 15b, and 15c. .

  According to the shavings conveying apparatus 10 according to the present embodiment, the apparatus main body 45 is divided into a plurality of unit blocks 46A, 46B, and 46C. Therefore, by combining an arbitrary number of unit blocks, long conveying surfaces 15a, 15b, 15c, Short conveying surfaces 15a, 15b, and 15c can be arbitrarily created, and it is possible to provide a shaving conveying apparatus with excellent versatility. In addition, since the voltage application circuits 30A, 30B, and 30C are provided corresponding to the unit blocks 46A, 46B, and 46C on a one-to-one basis, different voltages can be applied to the unit blocks 46A, 46B, and 46C. A conveyance form can be realized, and a chip conveying apparatus with excellent versatility can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a shavings separating and transporting system in which a shavings transporting apparatus according to an embodiment of the present invention is incorporated. It is a general | schematic disassembled perspective view of a part of apparatus main body of a shavings conveying apparatus. It is a connection diagram for demonstrating the connection method of the winding direction of a three-phase coil, and a voltage application circuit. It is a block diagram of an example of a voltage application circuit. It is a block diagram of the other example of a voltage application circuit. It is a wave form diagram of the voltage applied to a three phase coil. It is a schematic structure of the shavings conveying apparatus 10 which concerns on other embodiment. It is a block diagram of the conventional oil separator. It is a block diagram of the conventional chip / iron powder separation and removal apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Chip conveyance apparatus 14 Iron core 15a, 15b, 15c Immovable conveyance surface 22A, 22B, 22C, 22D Three-phase coil 30, 30A, 30B, 30C Voltage application circuit 45 Main body 46A, 46B, 46C Unit block
a Transport direction
Vu1, Vv1, Vw1 3-phase voltage during transport
Vu2, Vv2, Vw2 Three-phase voltage when transport is interrupted

Claims (1)

Apparatus main body, cutting the iron core having a groove at a disposed distance in conveying direction along the conveying direction of the scrap, the iron core by shifting the position in the conveying direction for each phase and for each pair A three-phase coil consisting of a plurality of sets wound around the groove , comprising a three-phase coil that generates a varying magnetic field when a three-phase alternating current flows,
In the swarf conveying apparatus comprising the apparatus main body and a voltage application circuit for applying a three-phase voltage to the three-phase coil, and conveying the swarf of the magnetic material by a variable magnetic field,
The U-phase coil, V-phase coil, and W-phase coil in the plurality of sets of three-phase coils are wound with the same-phase coils of the same phase of each adjacent set inserted into the same iron core groove. , Wound so that the winding direction of the different phase in-phase coils inserted in the same groove is the same direction,
The voltage application circuit has a three-phase voltage higher than that at the time of conveyance interruption, which will be described later, when conveying the shavings, and the chips are transferred to the immovable conveyance surface by a varying magnetic field generated by a three-phase alternating current flowing through the three-phase coil When applying a three-phase voltage that enables conveyance in the conveyance direction while magnetically attracting to the three-phase coil and interrupting the conveyance of shavings, the three-phase voltage or DC voltage is lower than that during the conveyance, Power is supplied to the three-phase coil by switching the tap of the transformer circuit so that a three-phase voltage or a DC voltage that enables the magnetically attracted shavings to be held on the immobile conveying surface is applied to the three-phase coil. Equipped with a tap changer or inverter,
A shavings conveying apparatus, wherein the apparatus main body is divided into a plurality of unit blocks, and each unit block is provided with the voltage application circuit in a one-to-one correspondence.

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