JP2007175795A - Grinding chip transfer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve transfer efficiency of grinding chips corresponding to sizes or the like of the grinding chips such as iron pieces, chips, and a magnetic material. <P>SOLUTION: A voltage application circuit 30 is provided with: a pattern selection circuit 31 that allows selection of transfer patterns; and an inverter 32 for applying a three-phase voltage, in which a voltage value and/or a frequency periodically varies corresponding to a command signal from the pattern selection circuit 31, to three-phase coils 22A, 22B, 22C, and 22D so as to transfer the grinding chips in a transfer direction (a) while magnetically attracting them onto an immovable transfer face 15a by a varying magnetic field generated by a three-phase AC current flowing in the three-phase coils 22A, 22B, 22C, and 22D. <P>COPYRIGHT: (C)2007,JPO&INPIT

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. 6 and 7 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. 7, the chip / iron powder separation / removal device 50 using the oil separator 55 is usually divided into a chip / iron powder recovery unit 52 and a coolant feed unit 53 in the tank 51. 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 device that is simple and inexpensive and that is maintenance-free.

  Furthermore, an object of the present invention is to increase the conveying efficiency of shavings corresponding to the size of shavings such as iron pieces, chips, and magnetic materials. In addition, the present invention is directed to the fact that, when the swarf is transported in the transport direction while magnetically attracting the swarf to the immobile transport surface by a variable magnetic field, the shavings may adhere to the transport surface and the transport efficiency may be reduced. An object of the present invention is to provide a swarf conveying device that makes it easier to transport swarf by loosening or strengthening the bonding force between the swarf magnetically attracted to the surface, thereby improving transport efficiency.

  The shavings conveying apparatus by this invention is a shavings conveying apparatus provided with an apparatus main body and a voltage application circuit, Comprising: The said apparatus main body is arrange | positioned along the conveyance direction of shavings, and for every phase Each set of n-phase coils (n is an integer of 2 or more) wound around the iron core while shifting the position in the transport direction, and a variable magnetic field is generated by the flow of an n-phase alternating current. The voltage application circuit includes a pattern selection circuit capable of selecting a conveyance pattern, and an n-phase in which a voltage value and / or frequency periodically changes according to a command signal from the pattern selection circuit. An inverter for applying a voltage to the n-phase coil, and transporting the shavings in the transport direction while magnetically attracting shavings to a non-moving transport surface by a fluctuating magnetic field generated by an n-phase alternating current flowing in the n-phase coil. Toss The

  According to the swarf conveying device of the present invention, since the swarf is transported by using the fluctuating magnetic field generated by the n-phase coil, the swarf transporting device can be configured easily and inexpensively and has no movable part, so that maintenance is possible. Free is possible. Further, the shaving carrier device of the present invention selects a command signal of the pattern selection circuit based on the size of the shavings and the like, and the voltage value and / or frequency changes periodically according to the command signal from the pattern selection circuit. N-phase voltage to be applied to the n-phase coil, in other words, the n-phase voltage is applied to the n-phase coil while sweeping, so it is suitable for the size of iron chips, chips, magnetic materials, etc. It is possible to obtain a transport pattern and increase the transport efficiency of shavings, and it is possible to loosen or strengthen the bonding force between the shavings magnetically attracted to the transport surface, so that the shavings on the transport surface It becomes difficult to cause a problem that the material remains fixed, and the transportation efficiency can be improved.

  Here, the n-phase voltage whose voltage value and / or frequency periodically change includes an n-phase voltage whose voltage value alternately changes between zero and a predetermined value. When such an n-phase voltage is applied to the n-phase coil, the binding force is strengthened by applying a predetermined voltage value, and the swarf that has become a lump on the conveying surface has a binding force that changes to a zero voltage value. When the voltage value of a predetermined value is applied after that, it becomes easy to be conveyed.

  Here, if 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, a long transport path can be obtained by combining an arbitrary number of unit blocks. In addition, it is possible to arbitrarily create a short conveyance path and to provide a shaving conveyance apparatus having excellent versatility. Further, by providing a voltage application circuit for each unit block, it is possible to obtain a transport pattern suitable for each unit block.

  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 for collecting magnetic shavings such as iron powder generated by grinding the grinding material (work) with the coolant 7 and the grinding machine 2, one end being disposed in the tank 3, and the other end being 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.

  FIG. 4 shows the configuration of the voltage application circuit 30.

  In FIG. 4, the voltage application circuit 30 includes a pattern selection circuit 31 and an inverter 32.

  The pattern selection circuit 31 is a circuit that outputs a command signal corresponding to the conveyance pattern selected or set by the operator to the inverter 32. Here, the transport pattern selected or set by the operator is a transport pattern suitable for increasing the transport efficiency of the shavings based on the size of the shavings such as iron pieces, chips, and magnetic materials. In particular, multiple types of periodic change patterns of the voltage value and / or frequency of the three-phase voltage applied to the three-phase coils (assembled coils) 22A, 22B, 22C, and 22D are prepared in advance and suitable for the shavings to be conveyed. It is assumed that the operator can select the change pattern, or the worker can freely set an arbitrary change pattern. Here, the n-phase voltage whose voltage value and / or frequency periodically change includes an n-phase voltage whose voltage value alternately changes between zero and a predetermined value. The inverter 32 periodically changes the voltage value and frequency of the three-phase voltage from the three-phase AC power supply 40 in accordance with a command signal from the pattern selection circuit 31 (command signal corresponding to the selected or set change pattern), and 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,..., A non-moving transfer surface, that is, a non-moving transfer surface 15a is provided.

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

  Prior to the start of work, the worker selects or sets a transport pattern suitable for the size of shavings and the like for the pattern selection circuit 31.

  Thereafter, when the operation is started, the inverter 32 periodically changes the voltage value and the frequency of the three-phase voltage from the three-phase AC power supply 40 in accordance with the command signal from the pattern selection circuit 31, and the U, V, W phase Applied to the coils 11C, 12C, 13C. The assembled coils 22A, 22B, 22C, and 22D to which the three-phase voltages Vu1, Vv1, and Vw1 are applied each generate a variable magnetic field, and the magnetic chips in the coolant 7 are magnetized by a combined magnetic field obtained by synthesizing these variable magnetic fields. A moving magnetic field that is attracted and transported 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.

  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 The voltage application circuit 30 includes a three-phase coil 22A, 22B, 22C, 22D that generates a variable magnetic field by flowing, and a voltage selection circuit 31 that can select a conveyance pattern and a voltage according to a command signal from the pattern selection circuit 31. An inverter 32 for applying a three-phase voltage whose value and / or frequency changes periodically to the three-phase coils 22A, 22B, 22C, 22D, and a three-phase alternating current flowing in the three-phase coils 22A, 22B, 22C, 22D The shavings are transported in the transport direction a while being magnetically attracted to the immobile transport surface 15a by the varying magnetic field generated by the current. Here, when an n-phase voltage whose voltage value changes alternately between zero and a predetermined value is set as an n-phase voltage whose voltage value and / or frequency changes periodically, coupling is performed by applying a predetermined voltage value. The swarf that becomes stronger and becomes a lump on the transport surface will be scattered by the weakening of the binding force when it changes to a zero voltage value, and will be transported when a predetermined voltage value is applied thereafter. It becomes easy.

  According to the swarf conveying apparatus 10 of the present embodiment, since the swarf is transported using the variable magnetic field generated by the three-phase coil, it can be configured easily and inexpensively and does not have a movable part. Therefore, maintenance-free is possible. Furthermore, the shaving carrier device 10 of the present embodiment selects or sets the command signal of the pattern selection circuit 31 based on the size of the shavings and the like, and the voltage value and / or according to the command signal from the pattern selection circuit 31. A three-phase voltage whose frequency changes periodically is applied to the three-phase coils 22A, 22B, 22C, and 22D. In other words, a three-phase voltage is swept and applied to the three-phase coils 22A, 22B, 22C, and 22D. Therefore, it is possible to obtain a transport pattern suitable for the size of shavings such as iron pieces, chips, and magnetic materials, and to increase the transport efficiency of the shavings, and to perform shaving magnetically attracted to the transport surface 15a. Since the binding force between the scraps can be loosened or strengthened, it becomes difficult to cause a problem that the scraps remain fixed on the transport surface 15a, and the transport efficiency can be improved. That.

  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 becomes possible to fall from. Further, a voltage obtained by superimposing a pulse waveform on the output voltage of the inverter 32 may be applied to the three-phase coils 22A, 22B, 22C, and 22D. In addition, a three-phase voltage having a constant voltage value and frequency is normally applied, and when the transport efficiency is lowered, the voltage value and / or frequency is changed and applied to the three-phase coils 22A, 22B, 22C, and 22D. May be.

  FIG. 5 shows a schematic configuration of the shavings conveying apparatus 10 according to another embodiment.

  In FIG. 5, 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 are connected to the unit blocks 46A, 46B, and 46C.

  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 for the unit blocks 46A, 46B, and 46C on a one-to-one basis, it is possible to obtain a conveyance pattern that conforms to the individual unit blocks 46A, 46B, and 46C. Become.

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 a voltage application circuit. 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 31 Pattern selection circuit 32 Inverter 45 Apparatus main body 46A, 46B, 46C Unit block
a Transport direction

Claims (3)

A swarf conveying device comprising a device main body and a voltage application circuit,
The apparatus main body is
An iron core disposed along the conveying direction of the shavings;
An n-phase coil (n: an integer of 2 or more) consisting of a plurality of sets wound around the iron core by shifting the position in the transport direction for each phase and for each set, and an n-phase alternating current flows And an n-phase coil that generates a variable magnetic field,
The voltage application circuit includes:
A pattern selection circuit capable of selecting a conveyance pattern, and an inverter that applies an n-phase voltage whose voltage value and / or frequency changes periodically according to a command signal from the pattern selection circuit, to the n-phase coil,
The swarf conveying apparatus, wherein the swarf is transported in the transport direction while being magnetically attracted to a stationary transport surface by a fluctuating magnetic field generated by an n-phase alternating current flowing in the n-phase coil.  2. The shaving according to claim 1, wherein the n-phase voltage whose frequency value and / or frequency changes periodically includes an n-phase voltage whose voltage value alternately changes between zero and a predetermined value. Waste transport device.  The chip conveying apparatus according to claim 1 or 2, 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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