JP2007118162A - Chip and iron powder conveying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chips and iron powder conveying device capable of smoothly delivering chips and iron powder between unit linear motors divided for structure. <P>SOLUTION: The unit linear motors 20A and 20B are structured by winding an even number or an odd number of coil pairs 14, which are respectively formed by arranging a U-phase coil 13U, a W-phase coil 13W and a V-phase coil 13V in order, around divided iron cores. The adjacent coil pairs 14 and 14 inside the unit linear motors 20A and 20B are arranged, while winding in opposite directions to each other, to form a synthetic magnetic field, and between the unit linear motors 20A and 20B, opposite coil pairs 14 and 14 are wound in the same direction to generate a synthetic magnetic field, and a mobile magnetic field is thereby formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chip / iron powder conveying device for discharging chips cut by a cutting machine or iron powder cut by a grinding machine from a tank.

  Chips, iron powder, and the like shaved by a molding machine such as a cutting machine or a grinding machine are collected in a tank by circulating cooling water. Since the cooling water in the tank is circulated, the chips and iron powder are usually separated and discharged so as not to contain chips and iron powder. Conventionally, as shown in FIGS. 8 to 9, the chip / iron powder separation / removal device 50 is performed using a so-called rotatable adsorption drum type oil separator 55. As shown in Patent Document 1, the oil separator 55 is provided with a large number of iron plates 57 along the peripheral wall of the suction drum 56, and is opposed to the inner surface position side of the peripheral surface of the suction drum 55. 58 is installed so that it can follow when the iron plate rotates. Further, an electromagnet 59 is installed on the other side of the suction drum 56 as a demagnetizing device for the iron plate 57.

  As shown in FIG. 9, the chip / iron powder separation / removal device 50 using the oil separator 55 divides the tank 51 into a chip / iron powder recovery unit 52 and a cooling water supply unit 53. The oil separator 55 is disposed on the chip / iron powder collecting unit 52 side. The chips and iron powder collected in the tank 51 together with the circulating cooling water 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 at the chute site. It was discharged by being peeled off by hand.

As a result, the cooling water from which the chips and iron powder have been removed flows into the cooling water feeding unit 53, and the cooling water can be circulated from the tank 51 into the molding machine 54.
Japanese Patent Laid-Open No. 5-57211 (see pages 2-3 and FIG. 1)

  However, the oil separator 55 described in Patent Document 1 has a high magnetic force because it uses rare earth magnets, and is expensive because it is configured in a complicated manner. Therefore, in order to reduce the cost of the transport device, the applicant of the present application pays attention to forming a moving magnetic field with a linear motor. At this time, the problem is that if the conveying distance of the chips and iron powder is long, the iron core constituting the linear motor becomes long, the mold for producing the iron core becomes expensive and its handling is difficult. .

  The present invention solves the above-mentioned problems, and a first object is to provide a transport device that can form a moving magnetic field and smoothly transport chips and iron powder. In order to reduce the cost of the mold, it is configured by connecting the divided unit conveying devices. At that time, the chips and iron powder can be smoothly transferred between the unit conveying devices of the chips and iron powder. An object of the present invention is to provide a transfer device.

Therefore, the chip and iron powder conveying device according to the present invention,
The invention according to claim 1 includes an iron core in which a plurality of groove portions are formed in a direction orthogonal to the conveying direction, and a coil that is inserted into the groove portion and wound around the iron core, the coil A chip / iron powder transfer device that generates a moving magnetic field by flowing alternating currents of different phases to
The iron core is divided into a plurality of units, and a unit linear motor is configured by winding a coil set that constitutes the coil in a plurality of phases around the divided unit iron cores,
The unit linear motors are sequentially arranged along the conveying direction of chips and iron powder, and the winding directions of the opposing coil sets in adjacent unit linear motors are wound in the same direction, respectively. Is.

  According to a second aspect of the present invention, the coil set includes a U-phase coil, a V-phase coil, and a W-phase coil and is connected to a three-phase AC power source, and an even number of the coil sets are arranged in the unit linear motor. It is characterized by being.

  According to a third aspect of the present invention, the coil set according to the first aspect of the present invention includes a U-phase coil, a V-phase coil, and a W-phase coil, and is connected to a three-phase AC power source. It is characterized by an odd number of sets.

  According to a fourth aspect of the present invention, the iron core includes a core portion formed between the groove portions, and the divided surfaces of the iron core are connected with the surfaces cut by the core portion as opposed surfaces. It is characterized by.

  The invention according to claim 5 is characterized in that the opposed surfaces of the adjacent iron cores according to the invention of claim 1 are connected with a gap.

  The invention according to claim 6 is characterized in that the adjacent coil sets in the unit linear motor are wound in the opposite directions and arranged in order.

  The invention according to claim 7 is characterized in that each unit linear motor is connected in parallel to the power source.

  According to the present invention, the chip / iron powder conveying device generates a composite magnetic field by flowing alternating currents having different phases, for example, two-phase or three-phase alternating currents, through a coil wound around an iron core. Since the combined magnetic field forms a moving magnetic field that moves with time, the chips and iron powder that have moved to one end of the transfer surface are attracted and moved on the transfer surface by magnetic force. Discharged.

  Therefore, if one end of the transfer device is placed in, for example, a tank into which chips / iron powder circulated with cooling water is introduced and the other end is placed outside the tank, the chips / iron powder in the tank Can be discharged to the outside and feed cooling water into the machine. In this way, the chip / iron powder conveying device can be configured simply and inexpensively without using an expensive oil separator because it can convey chips and iron powder with a configuration of only an iron core, a coil and a conveying surface. it can. Moreover, since this transport device does not require maintenance of the oil separator, it does not take time.

  Moreover, in this conveying apparatus, a unit linear motor is comprised by dividing | segmenting an iron core and winding the coil set which consists of a coil of a several phase around the divided | segmented iron core. And the conveying apparatus is comprised by arranging a some linear motor along the conveyance direction of a chip and iron powder.

  At this time, when the unit linear motors are arranged in order, if the winding directions of the opposing coil sets in the adjacent unit linear motors are the same, a combined magnetic field is generated between the adjacent unit linear motors to generate a moving magnetic field. Can be formed. As a result, it is possible to reliably deliver the chips and iron powder.

  In addition, when the AC power supply is a three-phase AC current, if the coil set wound around the unit linear motor (the U phase coil, the V phase coil, and the W phase coil constitute one set) is configured with an even number, Adjacent unit linear motors are manufactured in two types, and if they are composed of an odd number, they can be manufactured in one type.

  Next, the detail of the iron powder conveying apparatus of one form is demonstrated based on drawing.

  FIG. 1 is a simplified drawing showing a chip / iron powder separating and conveying line 1, and a grinding machine will be described as an example of a molding machine. Since the chips generated by grinding with a grinding machine are mainly iron powder, the “chip / iron powder” will be described as “iron powder”, and the “chip / iron powder transfer device” and “chip” will be described below. The “iron powder separating and conveying line” is referred to as “iron powder conveying device 10” and “iron powder separating and conveying line 1”.

  The iron powder separating and conveying line 1 includes a grinding machine 3, a pump 5 for collecting iron powder generated by grinding the abrasive with the grinding machine 3 together with cooling water, a tank 7 for collecting iron powder and cooling water, The iron powder conveying device 10 for conveying and discharging the iron powder in the tank 7 to the outside, the recovery path 8 for connecting the grinding machine 3 and the tank 7 via the pump 5 and the cooling water only to the grinding machine 3 are fed. And a feeding route 9 to be provided.

  The iron powder conveying device 10 of the embodiment is arranged so that one end is arranged in the tank 7 and the other end is arranged outside the tank 7 so that the iron powder in the tank 7 is separated from the tank 7 and can be conveyed outside the tank 7. Has been.

  As shown in FIG. 2, the basic configuration of the iron powder conveying apparatus 10 is wound around the iron core 11 in which a plurality of groove portions 111 and a core portion 112 are formed in order along the longitudinal direction, and the groove portion 111 of the iron core 11. The coil 13 is configured to have a coil 13 that is rotated and a case body 15 that is disposed around the iron core 11 and includes a conveyance surface 151 that conveys iron powder.

  And the unit linear motor 20 is comprised by dividing the iron core 11 into multiple along a longitudinal direction, and winding the coil 13 around the divided iron core 11. FIG. The unit linear motors 20 are arranged in order along the transport direction, and the case device 15 is attached to each unit linear motor 20 to constitute the transport device 10.

  The unit linear motor 20 is wound with a plurality of coil sets 14 through which a plurality of phases (for example, two phases or three phases) of alternating current flows. In the following embodiments, the alternating current will be described using a three-phase alternating current.

  That is, as shown in FIG. 3, the coil 13 wound around the iron core 11 is connected to the U-phase coil 13U connected to the power supply U-phase, the W-phase coil 13W connected to the power supply W-phase, and the power supply V-phase. The V-phase coil 13V is arranged, and the U-phase coil 13U, the W-phase coil 13W, and the V-phase coil 13V constitute one coil set 14. In order to generate a moving magnetic field, when arranging a plurality of coil sets 14 in order, the winding direction of each coil 13 of one adjacent coil set 14 and each coil 13 of the other coil set 14 is determined. Reverse direction. Further, in each coil set 14, the U-phase coil 13U, the W-phase coil 13W, and the V-phase coil 13V are arranged in this order from the right side, and the U-phase coil 13U and the V-phase coil 13V start winding in the rightmost coil set 14. The W-phase coil 13W is connected to the power supply E side, and the W-phase coil 13W is connected to the power supply E side. Further, the leftmost coil set 14 is connected at a midpoint.

  Next, each form in which the iron powder can be smoothly transferred between the unit linear motors 20 and 20 when the unit linear motors 20 configured as described above are arranged in order will be described.

  First, when the division surface of the iron core 11 in the unit linear motor 20 is divided by the core portion 112 and the coil sets 14 are incorporated and arranged in an even number, the arrangement is as shown in FIG. That is, the unit linear motor 20A (the right side in FIG. 4) and the unit linear motor 20B (the left side in FIG. 4) are arranged in order and are connected in parallel to the power source E. In each unit linear motor 20A, 20B, two coil sets 14 are arranged.

In the case of the unit linear motor 20A, the coil set 14A ₁ (right end) on the side that is not adjacent to the unit linear motor 20B is connected to the power source E, and the winding direction of each coil 13 is a right-handed direction (clockwise) in plan view. It is wound. Note that the U-phase coil 13U and the V-phase coil 13V have the winding start side on the power supply E side and the winding end side on the counter power supply side, and the W phase coil 13W has the winding start side on the counter power supply side and the winding end side on the power supply E side. .

Further, the coil set 14A ₂ on the side adjacent to the unit linear motor 20B is connected at the midpoint, and the winding direction of each coil 13 is wound in the left-handed direction (counterclockwise direction) in plan view. The U-phase coil 13U and the V-phase coil 13V are connected at the middle point on the winding end side, and the W-phase coil 13W is connected at the middle point on the winding start side.

On the other hand, in the case of the unit linear motor 20B, the coil set 14B ₁ on the side adjacent to the unit linear motor 20A is connected at the midpoint, and the winding direction of each coil 13 is wound in the left-handed direction (counterclockwise direction) in plan view. ing. The U-phase coil 13U and the V-phase coil 13V are connected at the midpoint on the winding end side, and the W-phase coil 13W is connected at the midpoint on the winding start side.

Further, the coil set 14B ₂ on the side not adjacent to the unit linear motor 20B is connected to the power source E, and the winding direction of each coil 13 is wound in the clockwise direction in a plan view. Note that the U-phase coil 13U and the V-phase coil 13V have the winding start side on the power supply E side and the winding end side on the counter power supply side, and the W phase coil 13W has the winding start side on the counter power supply side and the winding end side on the power supply E side. .

That is, in the portion where the unit linear motor 20A and the adjacent unit linear motor 20B face each other, the winding direction of the coil of the adjacent coil set 14A ₂ and the coil set 14B ₁ is wound in the same direction (left-handed direction). Will be. Accordingly, if an even number of coil sets 14 are arranged in the unit linear motor 20, for example, one of the coil sets 14 of one unit linear motor 20A (for example, 14A ₂ ) faces the coil set 14A ₂ . The coil set 14B ₂ arranged next to the coil set 14B ₁ of the other unit linear motor 20B is wound in the reverse direction. That is, the coil set 14A ₁ and the coil set 14B ₁ are reversed in the winding direction and require two types of unit linear motors 20A and 20B.

  In the case of the transport device 10, the magnetic field moves from the unit linear motor 20B toward the unit linear motor 20A. When transporting iron powder, the iron powder is transported from left to right. .

  In the case of FIG. 4, there are only two coil sets 14, but the relationship between adjacent coil sets 14 does not change even when there are 4, 6..., And the unit linear motor 20 </ b> A is composed of two types of unit linear motors. And the unit linear motor 20B are manufactured and arranged in order.

  In FIG. 4, the lower diagram shows a side view of the unit linear motor, and the upper diagram shows a plan view for showing the winding direction.

  Next, when the coil set 14 is incorporated into an odd number, it is configured as shown in FIG. That is, the unit linear motor 20C (the right side in FIG. 5) and the unit linear motor 20D (the left side in FIG. 5) are arranged in order and are connected in parallel to the power source E. In each unit linear motor 20C, 20D, one coil set 14 is arranged, and each coil set 14 is wound with each coil 13 of a U-phase coil 13U, a W-phase coil 13W, and a V-phase coil 13V. Has been.

  In both the unit linear motor 20C and the unit linear motor 20D, the U-phase coil 13U and the V-phase coil 13V in the coil set 14 are connected to the power source E side on the winding start side and are connected to the middle point on the winding end side. The winding end side is connected to the power source E side, and the winding start side is connected to the middle point. In this case, the winding direction is a right-handed direction (clockwise direction).

  Therefore, in the portion where the unit linear motor 20C and the adjacent unit linear motor 20D face each other, the adjacent coil set 14C and the coil winding direction of the coil set 14D are wound in the same direction. . In this case, the magnetic field moves from the unit linear motor 20B toward the unit linear motor 20A. When iron powder is conveyed, the iron powder is conveyed from left to right. In this case, the unit linear motor 20C and the unit linear motor 20D need only be manufactured in one type.

  In the case of FIG. 5, in the illustrated example, there is only one coil set 14, but even in the case of 3, 5..., The relationship between adjacent coil sets 14 does not change, and one type of unit linear motor 20. All you need to do is parallel in order.

  In FIG. 5, the lower diagram shows a side view of the unit linear motor, and the upper diagram shows a plan view for showing the winding direction.

  In the embodiment, the case body 15 disposed around the unit linear motor 20 is formed in a rectangular tube shape so as to surround the unit linear motor 20. The case body 15 is formed of a non-magnetic material having high electrical resistance, for example, stainless steel, and forms a surface located above the iron core 11 in FIG.

  The case body 15 may be a weak magnetic material or a thin iron plate as long as it is a magnetic material, in addition to a non-magnetic material. In the case of a weak magnetic material, the magnetic permeability may be in the range of 1.01 to 5500 (preferably, ˜), and this range includes, for example, grinding the surface of a stainless steel case body to make it magnetic. It is a waste.

  Experiments have shown that thin steel plates can be transported without cutting chips if the thickness is 3.5 mm or less.

  Furthermore, if the conveyance surface is the upper surface, lower surface or side surface of the iron core, the case body 15 does not have to be arranged.

  The case body 15 connects the unit linear motors 20 without a gap. For example, when the divided iron cores 11 and 11 are connected without a gap, the length of the case body 15 and the iron core 11 is substantially the same, but there is no gap between the iron cores 11 and 11. If it has, the case body 15 will be formed longer than the length of the iron core 11 by the gap.

  In addition, it has been confirmed from experimental results that even if there is a gap between the iron cores 11 and 11 in the adjacent unit linear motors 20, conveyance is possible. If this gap is within about 30 mm, delivery between the unit linear motors 20 and 20 can be performed. Having this gap makes it possible to dispose the conveying device 10 in a curved shape and loosen the connection accuracy between the unit linear motors 20 and 20.

  Next, the operation of the unit linear motor 20 and the transport device 10 configured as described above will be described.

  When a three-phase alternating current is passed through the coil 13, as shown in FIG. 8, in the unit linear motor 20, the U-phase coil 13U, the V-phase coil 13V, and the W-phase coil 13W each have a sine waveform that is 120 degrees out of phase. Will be drawn. For example, if three positions that elapse with time t in FIG. 6 are selected and the respective positions are time points P1, P2, and P3, the combined magnetic fields at time points P1, P2, and P3 are expressed as shown in FIG. That is, since the maximum magnetic force at each of the time points P1, P2, and P3 is shifted, this becomes a moving magnetic field that moves with time, and the object to be transported (iron powder in the embodiment) can be transported.

  Between the adjacent unit linear motors 20A and 20B, as described above, by making the winding directions of the opposing coil sets 14 the same direction, a combined magnetic field can be generated and a moving magnetic field can be formed. (Iron powder) is delivered.

  In the case of the iron powder conveyance line of FIG. 1, the iron powder adsorbed from the tank 7 is sucked by the unit linear motor 20 and placed on one end of the conveyance surface 151 of the iron powder conveyance device 10. And it passes along each unit linear motor 20 sequentially, and is dropped by the end part of the last unit linear motor 20, ie, the other end of the iron powder conveyance apparatus 10, and the iron powder tray which is arrange | positioned outside.

  As described above, the iron powder transfer device 10 according to the embodiment configures the unit linear motor 20 by winding a coil around the divided iron core 11, and arranges the unit linear motor 20 in order along the transfer direction. The transported object (iron powder) can be transported. At this time, when the winding directions of the coil sets 14 facing each other between the adjacent unit linear motors 20 and 20 are the same, delivery between the unit linear motors 20 can be performed reliably. Therefore, since the iron core 11 can be divided and configured, the iron core 11 can be manufactured at a low cost, and the iron powder transport device 10 that does not use an expensive oil separator can be provided.

  Note that the chip / iron powder conveying device and the separation conveying system of the present invention are not limited to the above-described embodiments. For example, the current flowing through the coil may be a two-phase AC current instead of a three-phase AC current. In this case, a two-phase alternating current can be created by inserting a capacitor into the single-phase alternating current.

  In the embodiment, the unit linear motors 20 are connected in parallel to the power supply, but may be connected in series.

  Furthermore, the case body of the non-magnetic material that forms the transport surface is not limited to a stainless steel material as long as it has a high electrical resistance.

  Further, the case body may not be a rectangular tube shape but may be a flat plate shape.

It is a simplified perspective view which shows the iron powder conveyance line of one form. It is a disassembled perspective view which shows a part of conveying apparatus in FIG. It is a connection diagram which shows the winding state of the coil in FIG. It is a block diagram which shows the connection state of the unit linear motor which uses an even number of coil group. It is a block diagram which shows the connection state of the unit linear motor which uses an odd number of coil groups. It is a wave form diagram which shows the synthetic magnetic field of the coil set in a unit linear motor. It is a wave form diagram which shows the moving magnetic field in a unit linear motor. It is sectional drawing which shows the conventional oil separator. It is a simplified perspective view which shows the conventional iron powder separation conveyance system which uses the oil separator of FIG.

Explanation of symbols

1. Iron powder conveying line 3. Polishing machine (molding machine)
5, pump 7, tank 10, iron powder transfer device 11, iron core 111, groove 112, core 13, coil 14, coil assembly 15, case body 20, unit linear motor P1, time P2, time P3, time E, Power supply

Claims (7)

An iron core having a plurality of grooves formed in a direction orthogonal to the conveying direction; and a coil that is inserted into the groove and wound around the iron core, and passes alternating currents of different phases through the coils. A chip / iron powder transfer device that generates a moving magnetic field,
The iron core is divided into a plurality of units, and a unit linear motor is configured by winding a coil set that constitutes the coil in a plurality of phases around the divided unit iron cores,
The unit linear motors are sequentially arranged along the conveying direction of chips and iron powder, and the winding directions of the opposing coil sets in adjacent unit linear motors are wound in the same direction, respectively. Chip / iron powder transfer device.   The coil set includes a U-phase coil, a V-phase coil, and a W-phase coil, and is connected to a three-phase AC power source, and an even number of the coil sets are arranged in the unit linear motor. The chip / iron powder conveying apparatus according to 1.   The coil set includes a U-phase coil, a V-phase coil, and a W-phase coil, and is connected to a three-phase AC power source, and an odd number of the coil sets are arranged in the unit linear motor. The chip / iron powder conveying apparatus according to 1.   The iron core includes a core portion formed between the groove portions, and the split surfaces of the iron core are connected to each other with the surfaces cut by the core portion as opposed surfaces. The apparatus for conveying chips or iron powder according to any one of 2 and 3.   5. The chip / iron powder conveying apparatus according to claim 1, wherein the facing surfaces of the adjacent iron cores are connected with a gap.   6. The chip and iron powder according to claim 1, 2, 3, 4 or 5, wherein each adjacent coil set in the unit linear motor is wound in the opposite direction and arranged in order. Transport device.   Each unit linear motor is connected in parallel with respect to a power supply, The chip | piece / iron powder conveying apparatus in any one of Claim 1, 2, 3, 4, 5 or 6 characterized by the above-mentioned.

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