JP7495147B2 - Chip filtration device - Google Patents

Description

The present invention relates to a chip filtering device.

Patent Document 1 describes a coolant treatment device.
The above-mentioned coolant treatment device includes a dirty tank as a primary storage tank, a cyclone separator, a secondary separation mechanism, and a clean tank as a clean tank. The dirty tank stores the coolant discharged from the machine tool. The coolant discharged from the machine tool is mixed with chips. The cyclone separator introduces the coolant stored in the dirty tank and separates the chips and the coolant by a solid-liquid separation action based on the difference in specific gravity. The coolant separated by the cyclone separator is returned to the clean tank. The clean tank stores the coolant to be returned to the machine tool. The chips separated by the cyclone separator are fed into the secondary separation mechanism. The coolant adheres to the chips separated by the cyclone separator.

The secondary separation mechanism has a casing and a rotating drum. The casing has a pair of bulging portions that bulge outward in an arc shape. The rotating drum is housed within the pair of bulging portions. A number of slits are formed in the pair of bulging portions. The chips separated by the cyclone separator are fed into the casing. The chips fed into the casing are pressed against the pair of bulging portions by the rotation of the rotating drum. This causes the coolant adhering to the chips fed into the casing to seep out from the multiple slits. The coolant that seeps out from the slits is returned to the dirty tank. The secondary separation mechanism separates the coolant adhering to the chips fed into the casing and discharges the remaining chips into a collection box.

JP 2015-66641 A

The smaller the chips, the smaller the difference in specific gravity between the chips and the coolant. This makes it difficult for the cyclone separator to separate the chips and the coolant. As a result, the tiny chips are discharged into the clean tank, causing them to accumulate in the clean tank and the coolant containing the tiny chips to be returned to the machine tool.

Furthermore, if tiny chips are introduced into the casing of the secondary separation mechanism, they will pass through the slits in the casing together with the coolant and then be returned to the primary storage tank. This can result in the tiny chips accumulating at the bottom of the primary storage tank.

The chip filtering device for solving the above problems comprises a primary storage tank in which primary cutting oil, which is cutting oil containing chips, is stored, an endless belt equipped with a scraper for collecting the chips that reach the bottom of the primary storage tank, a drum filter that is a cylindrical filter member that is housed in the primary storage tank and filters the chips from the primary cutting oil and is disposed between an upper stage portion of the belt and a lower stage portion of the belt, and a secondary cutting oil that filters the chips from the primary cutting oil by the drum filter. The gist of the system is that it comprises a secondary storage tank in which oil is stored, a cyclone separator that further filters the chips from the secondary cutting oil and separates the secondary cutting oil into a primary discharge containing the chips and a primary return oil, a clean tank in which the primary return oil is stored, and a magnetic separator that further filters the chips from the primary discharge and separates the primary discharge into a secondary discharge containing the chips and a secondary return oil that is returned to the primary storage tank by magnetically attracting the chips.

In the above chip filtering device, a portion of the primary storage tank is accommodated in the secondary storage tank, and the primary storage tank is provided with a communication port for discharging the secondary cutting oil into the secondary storage tank. The primary storage tank extends upward from the bottom in the longitudinal direction of the belt while moving away from the drum filter, and has a storage section in which a portion of the belt is accommodated, and a discharge section that discharges the chips collected by the scraper from the storage section as the lower section of the belt passes through the storage section. The magnetic separator is fixed to the storage section, and the secondary discharge and the chips discharged from the discharge section may be collected in the same collection box.

This invention makes it possible to suppress the accumulation of minute chips in the primary storage tank and clean tank.

FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1. FIG.

Below, one embodiment of a chip filtering device will be described with reference to Figures 1 to 3. The chip filtering device of this embodiment is a device that filters chips contained in cutting oil discharged from a machine tool.

<Chip filtration device>
As shown in FIG. 1 , the chip filtering device 10 includes a primary storage tank 20 , a secondary storage tank 30 , a drum filter 40 , and a clean tank 50 .

The primary storage tank 20 and the secondary storage tank 30 are box-shaped with a long side extending in one direction and a short side extending in another direction perpendicular to the first direction. A part of the primary storage tank 20 is contained in the secondary storage tank 30. The clean tank 50 is adjacent to the primary storage tank 20 and the secondary storage tank 30 in the longitudinal direction of the primary storage tank 20 and the secondary storage tank 30. The clean tank 50 is integrally formed with the primary storage tank 20 and the secondary storage tank 30. The primary storage tank 20, the secondary storage tank 30, and the clean tank 50 open upward. The primary storage tank 20, the secondary storage tank 30, and the clean tank 50 have a common bottom 55. The bottom 55 is plate-shaped. The primary storage tank 20 has an opening 21 and a lid 22. The opening 21 and the lid 22 are located above the primary storage tank 20.

As shown in FIG. 2, the opening 21 of the primary storage tank 20 opens upward. The lid portion 22 is provided adjacent to the opening 21 in the longitudinal direction of the primary storage tank 20. The lid portion 22 extends upward as it moves away from the opening 21 in the longitudinal direction of the primary storage tank 20.

The primary storage tank 20 has an inclined wall 23, an extension wall 24, and an end wall 25. The inclined wall 23 and the extension wall 24 are provided below the lid portion 22. The inclined wall 23 extends from the bottom 55 to above the secondary storage tank 30. The inclined wall 23 has a thickness in the longitudinal direction of the primary storage tank 20. The extension wall 24 is continuous with the inclined wall 23. The extension wall 24 extends horizontally from the end of the inclined wall 23 opposite the bottom 55. The extension wall 24 has a thickness in the vertical direction. The extension wall 24 extends from the inclined wall 23 to the outside of the secondary storage tank 30 in the longitudinal direction of the primary storage tank 20. The extension wall 24 does not have to extend horizontally. It is sufficient that the extension wall 24 extends at least to the outside of the secondary storage tank 30.

The end wall 25 is continuous with the end of the extension wall 24 and the end of the lid portion 22. The extension wall 24 is provided with a discharge portion 26. The discharge portion 26 penetrates the extension wall 24. The discharge portion 26 opens downward. A collection box 100 is disposed directly below the discharge portion 26.

As shown in FIG. 1, the primary storage tank 20 has a pair of side walls 27. The pair of side walls 27 are walls located in the short direction of the primary storage tank 20. The pair of side walls 27 extend upward from the bottom 55. The pair of side walls 27 form part of the opening 21. The pair of side walls 27 are continuous with the lid portion 22, the inclined wall 23, and the extension wall 24. As shown in FIG. 2, the pair of side walls 27 are also continuous with the end wall 25.

As shown in FIG. 1, one of the pair of side walls 27 is a first wall 271, and the other is a second wall 272. A communication hole 28 is formed in the first wall 271. The communication hole 28 penetrates the first wall 271. The communication hole 28 is located below the lid portion 22. The communication hole 28 faces a part of the wall that partitions the secondary storage tank 30 in the short direction of the primary storage tank 20.

As shown in Figures 1 and 2, in the primary storage tank 20, the area surrounded by the lid portion 22, the inclined wall 23, the extension wall 24, the end wall 25, and the pair of side walls 27 is the storage portion 29. The primary storage tank 20 has the storage portion 29 and a discharge portion 26 that is connected to the inside of the storage portion 29.

The drum filter 40 is housed in the primary storage tank 20. The drum filter 40 is disposed above the bottom 55 and adjacent to the inclined wall 23. The drum filter 40 is disposed below the storage section 29.

As shown in FIG. 1, the drum filter 40 is a cylindrical filter member. In the axial direction of the drum filter 40, one end of the drum filter 40 faces the communication port 28. In the axial direction of the drum filter 40, a seal member (not shown) is provided between the entire circumference of both ends of the drum filter 40 and the pair of side walls 27. As a result, the inside of the drum filter 40 and the inside of the primary storage tank 20 are only connected via a mesh (not shown) that forms the outer periphery of the drum filter 40. The cutting oil that has passed through the drum filter 40 is discharged from the communication port 28 to the secondary storage tank 30. Note that the configuration of the drum filter 40 is publicly known, so the mesh is not shown. The mesh is a mesh-like filter.

<Primary conveyor and primary conveyor housing>
1 and 2 , the chip filtering device 10 includes a primary conveyor 60 and a primary conveyor housing section 70. The primary conveyor housing section 70 is a section that houses the primary conveyor 60. A portion of the primary conveyor housing section 70 is housed in the primary storage tank 20.

The primary conveyor storage section 70 has a first storage area 71, a second storage area 72, a third storage area 73, and a discharge area 74. The first storage area 71 is stored inside the opening 21 of the primary storage tank 20. The first storage area 71 and the first wall 271 are separated in the short direction of the primary storage tank 20. The first storage area 71 shares the second wall 272 of the primary storage tank 20. The first storage area 71 is stored in the opening 21 so that a portion of the opening 21 is open upward.

A first opening 711 is formed in the first storage area 71. The first opening 711 opens upward. A second opening 712 is formed in the first storage area 71. The second opening 712 is formed in a position facing the first wall 271 in the first storage area 71. The second opening 712 connects the interior of the first storage area 71 to the interior of the primary storage tank 20.

The second storage area 72 extends upward in the longitudinal direction of the primary storage tank 20 as it moves away from the first storage area 71. The second storage area 72 is located above the lid 22 of the primary storage tank 20. The third storage area 73 extends horizontally from the upper end of the second storage area 72. The third storage area 73 extends to the outside of the secondary storage tank 30 in the longitudinal direction of the primary storage tank 20. The third storage area 73 does not have to extend horizontally. It is sufficient that the third storage area 73 extends at least to the outside of the secondary storage tank 30.

As shown in FIG. 2, the discharge portion 74 protrudes downward from the third storage portion 73. The discharge portion 74 is adjacent to the end wall 25 in the longitudinal direction of the primary storage tank 20. A third opening 713 is formed in the discharge portion 74. The third opening 713 is provided below the discharge portion 74. The third opening 713 is connected to the inside of the discharge portion 74. The collection box 100 is disposed directly below the third opening 713.

The primary conveyor 60 includes a fixed support shaft 61, a driven sprocket wheel 62, a movable support shaft 63, a driving sprocket wheel 64, and an endless first belt 65. The first belt 65 is, for example, a hinge belt. The fixed support shaft 61 is provided inside the first storage area 71. The fixed support shaft 61 is fixed to the first storage area 71. The driven sprocket wheel 62 is rotatably supported by the fixed support shaft 61. The movable support shaft 63 is rotatably supported by the third storage area 73. The driving sprocket wheel 64 is supported by the movable support shaft 63 so as to be rotatable together with the movable support shaft 63. The first belt 65 is stretched around the driving sprocket wheel 64 and the driven sprocket wheel 62. The primary conveyor 60 has a drive mechanism (not shown). The movable support shaft 63 rotates by the drive mechanism. The rotation of the movable support shaft 63 rotates the driving sprocket wheel 64, and the first belt 65 runs between the driving sprocket wheel 64 and the driven sprocket wheel 62. As the first belt 65 runs, the driven sprocket wheel 62 rotates relative to the fixed support shaft 61. The upper stage 65a of the first belt 65 moves from the driven sprocket wheel 62 toward the driving sprocket wheel 64. The lower stage 65b of the first belt 65 moves from the driving sprocket wheel 64 toward the driven sprocket wheel 62. The longitudinal direction of the first belt 65 coincides with the longitudinal direction of the primary storage tank 20. The width direction of the first belt 65 coincides with the lateral direction of the primary storage tank 20.

<Secondary conveyor>
The chip filtering device 10 includes a secondary conveyor 80. The secondary conveyor 80 is accommodated in the primary storage tank 20. The secondary conveyor 80 includes a fixed support shaft 81, a driven sprocket wheel 82, a movable support shaft 83, a driving sprocket wheel 84, and an endless second belt 85. The fixed support shaft 81 is disposed below the first storage portion 71. The fixed support shaft 81 is fixed to the primary storage tank 20. The driven sprocket wheel 82 is rotatably supported by the fixed support shaft 81. The movable support shaft 83 is disposed in the storage portion 29 of the primary storage tank 20. The movable support shaft 83 is disposed between the lid portion 22 and the extension wall 24. The movable support shaft 83 is rotatably supported with respect to the storage portion 29. The second belt 85 is stretched between the driving sprocket wheel 84 and the driven sprocket wheel 82. A plurality of scrapers 86 are attached to the second belt 85. The second belt 85 is a belt to which the scrapers 86 are attached. The second belt 85 is a scraper belt. The second belt 85 coincides with the longitudinal direction of the first belt 65. The second belt 85 coincides with the longitudinal direction of the primary storage tank 20. The width direction of the second belt 85 coincides with the width direction of the first belt 65. The width direction of the second belt 85 coincides with the short side direction of the primary storage tank 20.

The drum filter 40 is disposed between the upper stage 85a of the second belt 85 and the lower stage 85b of the second belt 85. The second belt 85 is a belt that goes around the periphery of the drum filter 40. The upper stage 85a of the second belt 85 is located below the primary conveyor storage section 70 and below the lid section 22. The upper stage 85a of the second belt 85 passes through the inside of the storage section 29.

The lower portion 85b of the second belt 85 extends along the bottom 55, the inclined wall 23, and the extension wall 24 of the primary storage tank 20. The lower portion 85b of the second belt 85 passes through the storage section 29. A part of the second belt 85 is stored in the storage section 29. The inclined wall 23 extends upward from the bottom 55 in the longitudinal direction of the second belt 85 while moving away from the drum filter 40. The storage section 29 extends upward in the longitudinal direction of the second belt 85 while moving away from the drum filter 40.

The secondary conveyor 80 has a drive mechanism (not shown). The drive mechanism rotates the movable support shaft 83. The rotation of the movable support shaft 83 rotates the drive sprocket wheel 84, causing the second belt 85 to rotate between the drive sprocket wheel 84 and the driven sprocket wheel 82. As the second belt 85 rotates, the driven sprocket wheel 82 rotates relative to the fixed support shaft 81. The upper stage 85a of the second belt 85 moves from the drive sprocket wheel 84 toward the driven sprocket wheel 82. The lower stage 85b of the second belt 85 moves from the driven sprocket wheel 82 toward the drive sprocket wheel 84.

<Cyclone separator, magnetic separator, first pump, second pump>
1, the chip filtering device 10 includes a cyclone separator 91, a magnetic separator 93, a first pump P1, and a second pump P2. The first pump P1 is provided, for example, on a cover member 92a that closes the upper part of the secondary storage tank 30. The second pump P2 is provided, for example, on a cover member 92b that closes the upper part of the clean tank 50. The second pump P2 sucks up the cutting oil stored in the clean tank 50. The second pump P2 returns the sucked up cutting oil to the machine tool.

The cyclone separator 91 has an intake port 91a, a return port 91b, and a discharge port 91c. The return port 91b is located above the cyclone separator 91. The discharge port 91c is located below the cyclone separator 91. The return port 91b and the discharge port 91c are located on opposite sides of each other. The cyclone separator 91 is a device that separates dust by applying centrifugal force to cutting oil containing dust. The cyclone separator 91 is attached to a bracket Br fixed to the third storage area 73 of the primary conveyor storage section 70. The configuration of the cyclone separator 91 is publicly known, so a detailed description of the configuration will be omitted.

The first flow path member R1 is attached to the suction port 91a. The first flow path member R1 is, for example, a flexible tube. One end of the first flow path member R1 is detachably attached to the suction port 91a. For example, a cylindrical suction port 91a is press-fitted into one end of the first flow path member R1. The attachment manner of the first flow path member R1 to the suction port 91a may be changed as appropriate. The other end of the first flow path member R1 is connected to the first pump P1. The first pump P1 sucks up the cutting oil stored in the secondary storage tank 30. The cutting oil sucked by the first pump P1 is introduced into the cyclone separator 91 through the first flow path member R1.

The second flow path member R2 is attached to the return port 91b. The second flow path member R2 is, for example, a flexible tube. One end of the second flow path member R2 is detachably attached to the return port 91b. For example, a cylindrical return port 91b is press-fitted into one end of the second flow path member R2. The manner in which the second flow path member R2 is attached to the return port 91b may be changed as appropriate. The other end of the second flow path member R2 enters the interior of the clean tank 50.

A third flow path member R3 is attached to the discharge port 91c. The third flow path member R3 is, for example, a flexible tube. One end of the third flow path member R3 is detachably attached to the discharge port 91c. For example, a cylindrical discharge port 91c is press-fitted into one end of the third flow path member R3. The manner in which the third flow path member R3 is attached to the discharge port 91c may be changed as appropriate. The other end of the third flow path member R3 is attached to the magnetic separator 93.

As shown in FIG. 3, the magnetic separator 93 has an intake port 93a, a return port 93b, and a discharge portion 93c. The magnetic separator 93 is a device that magnetically attracts and separates dust contained in the discharged material fed from the discharge port 91c of the cyclone separator 91 when the dust is a magnetic material. The magnetic separator 93 is disposed below the cyclone separator 91. The magnetic separator 93 faces the discharge port 91c of the cyclone separator 91. The magnetic separator 93 is fixed to the first wall 271. The magnetic separator 93 is fixed to the storage portion 29. The magnetic separator 93 has a cylindrical magnet drum that attracts the dust, which is a magnetic material, and a cylindrical dehydration drum that squeezes out liquid from the dust attracted by the magnet drum. The configuration of the magnetic separator 93 is publicly known. For this reason, the configuration of the magnet drum and dehydration drum in the magnetic separator 93 is omitted from the illustration for ease of explanation.

The other end of the third flow path member R3 is attached to the suction port 93a. For example, a cylindrical suction port 93a is press-fitted into the other end of the third flow path member R3. The manner in which the suction port 93a is attached to the third flow path member R3 may be changed as appropriate.

A fourth flow path member R4 is attached to the return port 93b. The fourth flow path member R4 is, for example, a flexible tube. One end of the fourth flow path member R4 is detachably attached to the return port 93b. For example, a cylindrical return port 93b is press-fitted into one end of the fourth flow path member R4. The manner in which the fourth flow path member R4 is attached to the return port 93b may be changed as appropriate.

The other end of the fourth flow path member R4 is attached to the storage section 29. In this embodiment, the other end of the fourth flow path member R4 is attached to the first wall 271. A communication hole 271a is formed in the first wall 271. The communication hole 271a penetrates the first wall 271. The communication hole 271a is connected to the inside of the storage section 29. The communication hole 271a is located above the drum filter 40. The other end of the fourth flow path member R4 is attached to the communication hole 271a. The fourth flow path member R4 is connected to the communication hole 271a.

The discharge section 93c is, for example, a slider for discharging the discharged material discharged from the magnetic separator 93 into the collection box 100. The collection box 100 is disposed directly below the discharge section 93c. The discharge section 26, the third opening 713, and the discharge section 93c are disposed directly above the collection box 100. The capacity of the collection box 100 is sufficiently larger than the capacity of a generally known sludge pot. The capacity of the collection box 100 is such that the discharged material does not overflow from the collection box 100 even if the chip filtering device 10 continues to operate, for example, at night. The sludge pot is a small container that stores the discharged material discharged from the discharge port 91c of the cyclone separator 91.

<Chip filtration>
2, the turbid cutting oil Lmix, which is the cutting oil L containing the chips Ch, is introduced into the first opening 711 of the first storage section 71. The turbid cutting oil Lmix is discharged from the machine tool. The chips Ch are magnetic materials.

The relatively large chips Ch contained in the turbid cutting oil Lmix are captured by the upper stage 65a of the first belt 65 of the primary conveyor 60. The chips Ch captured by the upper stage 65a are transported by the first belt 65. The chips Ch transported by the first belt 65 are discharged from the third opening 713 into the collection box 100. The relatively large chips Ch are separated from the turbid cutting oil Lmix by the primary conveyor 60.

The primary cutting oil L1, which is the cutting oil L containing chips Ch that could not be captured by the first belt 65, is discharged downward from the upper stage 65a and then discharged from the second opening 712 of the first storage area 71. The primary cutting oil L1 is stored in the primary storage tank 20. The chips Ch contained in the primary cutting oil L1 reach the bottom 55 of the primary storage tank 20.

As the second belt 85 rotates, the scraper 86 collects the chips Ch that reach the bottom 55 of the primary storage tank 20. As the lower portion 85b of the second belt 85 passes through the storage section 29, the chips Ch collected by the scraper 86 are discharged from the discharge section 26. The discharge section 26 discharges the chips Ch from the storage section 29. The chips Ch discharged from the discharge section 26 are discharged into a collection box 100.

The chips Ch contained in the primary cutting oil L1 are filtered by the drum filter 40. The drum filter 40 filters the chips Ch from the primary cutting oil L1. The secondary cutting oil L2, which has been filtered of the chips Ch from the primary cutting oil L1 by the drum filter 40, enters the inside of the drum filter 40. The secondary cutting oil L2 is cutting oil L that contains relatively small chips Ch that have passed through the drum filter 40.

As shown in FIG. 1, the secondary cutting oil L2 is discharged from the communication port 28 to the secondary storage tank 30. The communication port 28 is a hole for discharging the secondary cutting oil L2 to the secondary storage tank 30. The secondary storage tank 30 stores the secondary cutting oil L2.

As shown in FIG. 3, the secondary cutting oil L2 stored in the secondary storage tank 30 is introduced into the cyclone separator 91 from the first flow path member R1 by being sucked into the first pump P1. The cyclone separator 91 separates the secondary cutting oil L2 into the primary discharge E1 and the primary return oil Lr1. The primary discharge E1 contains more chips Ch than the primary return oil Lr1. The primary discharge E1 contains less cutting oil L than the primary return oil Lr1. The primary discharge E1 has a higher specific gravity than the primary return oil Lr1. The primary discharge E1 is fed from the discharge port 91c into the suction port 93a of the magnetic separator 93. The primary return oil Lr1 is returned to the clean tank 50 via the second flow path member R2. The amount of chips Ch contained in the primary return oil Lr1 is less than the amount of chips Ch contained in the secondary cutting oil L2 introduced into the cyclone separator 91. The cyclone separator 91 further filters the chips Ch from the secondary cutting oil L2.

In the secondary storage tank 30, it is possible to filter the chips Ch before they are sucked into the first pump P1 by placing a filter member such as a mesh filter between the communication port 28 and the first pump P1. However, in this embodiment, a filter member is not placed in the secondary storage tank 30. This is to prevent minute chips Ch that reach the secondary storage tank 30 from being blocked by the filter member, while actively drawing them into the first pump P1, thereby filtering the chips Ch in the cyclone separator 91.

The primary discharge E1 fed into the suction port 93a is separated into the secondary discharge E2 and the secondary return oil Lr2. The magnetic separator 93 separates the primary discharge E1 into the secondary discharge E2 and the secondary return oil Lr2 by magnetically adsorbing the chips Ch. The magnetic separator 93 generates the secondary discharge E2 by magnetically adsorbing the chips Ch contained in the primary discharge E1. The secondary discharge E2 contains more chips Ch than the secondary return oil Lr2. The secondary discharge E2 is formed by collecting minute chips Ch using a magnet drum (not shown) and a dehydration drum (not shown). The secondary discharge E2 contains almost no cutting oil L. The secondary discharge E2 is in the form of a lump. The secondary discharge E2 is discharged from the discharge section 93c to the recovery box 100. The secondary discharge E2, the chips Ch discharged from the discharge section 26, and the chips Ch discharged from the third opening 713 are collected in the same collection box 100.

The secondary return oil Lr2 is liquid. The secondary return oil Lr2 is returned into the storage section 29 via the fourth flow path member R4. In other words, the secondary return oil Lr2 is returned to the primary storage tank 20. The secondary return oil Lr2 contains almost no chips Ch. The magnetic separator 93 further filters the chips Ch from the primary discharge E1 by magnetically attracting the chips Ch.

<Action of this embodiment>
The operation of this embodiment will now be described.
The relatively large chips Ch that reach the bottom 55 of the primary storage tank 20 are collected by the second belt 85, while the relatively large chips Ch are filtered by the drum filter 40. Then, the chips Ch contained in the secondary cutting oil L2 are filtered by the cyclone separator 91 and the magnetic separator 93. The secondary return oil Lr2 discharged from the magnetic separator 93 contains almost no fine chips Ch. Therefore, even if the secondary return oil Lr2 is returned to the primary storage tank 20, the fine chips Ch are unlikely to accumulate in the primary storage tank 20. Therefore, by repeatedly filtering the fine chips Ch by the magnetic separator 93 and returning the secondary return oil Lr2 to the primary storage tank 20, the fine chips Ch are unlikely to accumulate in the primary storage tank 20. Furthermore, since the amount of fine chips Ch contained in the secondary cutting oil L2 stored in the secondary storage tank 30 is reduced, even if the primary return oil Lr1 discharged from the cyclone separator 91 is returned to the clean tank 50, fine chips Ch are less likely to accumulate in the clean tank 50.

<Effects of this embodiment>
The effects of this embodiment will be described.
(1) By repeatedly filtering out tiny chips Ch using the magnetic separator 93 and returning the secondary return oil Lr2 to the primary storage tank 20, the accumulation of tiny chips Ch in the primary storage tank 20, the secondary storage tank 30, and the clean tank 50 can be suppressed.

(2) When cleaning the primary storage tank 20, the secondary storage tank 30, and the clean tank 50, it is necessary to stop the operation of the machine tool as well as the second belt 85. In this regard, since chips Ch are less likely to accumulate in the primary storage tank 20, the secondary storage tank 30, and the clean tank 50, it is possible to reduce the frequency with which the primary storage tank 20, the secondary storage tank 30, and the clean tank 50 are cleaned, and the frequency with which the machine tool is stopped.

(3) The secondary discharge material E2 discharged from the magnetic separator 93, the chips Ch discharged from the discharge section 26, and the chips Ch discharged from the third opening 713 are collected in the same collection box 100. Therefore, the chips Ch discharged from the chip filtering device 10 can be easily managed and processed.

(4) In a chip filtering device 10 in which the cyclone separator 91 and the magnetic separator 93 are omitted, it is possible to filter the chips Ch contained in the secondary cutting oil L2 by placing a filter member such as a mesh filter in the secondary storage tank 30. However, it is necessary to replace the filter member periodically. For this reason, the chip filtering device 10 may be temporarily stopped when replacing the filter member.

In this embodiment, the cyclone separator 91 can filter the chips Ch contained in the secondary cutting oil L2 without placing a filter member such as a mesh filter in the secondary storage tank 30. This eliminates the need to replace the filter member that filters the chips Ch contained in the secondary cutting oil L2. Furthermore, the second belt 85, drum filter 40, cyclone separator 91, and magnetic separator 93 automatically continue filtering the chips Ch without stopping the chip filtering device 10. This can facilitate automation of the chip filtering device 10.

(5) For example, consider a case where a workpiece made of a magnetic material is precision machined using a machine tool. In this case, the cutting tool used to cut the workpiece may have a discharge hole formed therein for discharging cutting oil L introduced inside to the outside. In other words, the workpiece may be cut while discharging cutting oil L from the cutting tool.

In this embodiment, the amount of fine chips Ch contained in the primary return oil Lr1 returned to the machine tool by the second pump P2 is easily reduced, so the return of fine chips Ch to the machine tool is suppressed. Therefore, when the primary return oil Lr1 returned to the machine tool by the second pump P2 is introduced into the cutting tool, the fine chips Ch can be prevented from clogging the discharge hole of the cutting tool.

(6) The minute chips Ch contained in the secondary cutting oil L2 stored in the secondary storage tank 30 are easily reduced by being filtered by the magnetic separator 93. This makes it possible to prevent minute chips Ch from accumulating in the flow path of the cutting oil L in the machine tool and to prevent the flow path from being blocked by the accumulated minute chips Ch. This eliminates the need to employ various types of filter members for filtering minute chips Ch in the machine tool, and also eliminates the need to replace the filter members.

(7) Because the capacity of the collection box 100 is sufficiently larger than the capacity of the sludge pot, even if the chip filtering device 10 continues to operate at night, the chips Ch will not overflow from the collection box 100. Therefore, compared to the case where the chips Ch are collected in a sludge pot, the chip filtering device 10 can be operated unmanned even at night when there are no workers.

[Example of change]
This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

The clean tank 50 does not have to be integrally formed with the primary storage tank 20 and the secondary storage tank 30. The clean tank 50 may be separate from the primary storage tank 20 and the secondary storage tank 30. Even in this modification, it is sufficient that the other end of the second flow path member R2 enters the interior of the clean tank 50.

○ A portion of the primary storage tank 20 does not have to be contained in the secondary storage tank 30. The primary storage tank 20 and the secondary storage tank 30 may be separate. In this case, the secondary cutting oil L2 obtained by filtering the cutting chips Ch from the primary cutting oil L1 by the drum filter 40 may be discharged to the secondary storage tank 30 through a new flow path connecting the primary storage tank 20 and the secondary storage tank 30.

The chips Ch discharged from the third opening 713, the discharge section 26, and the secondary discharged material E2 discharged from the magnetic separator 93 do not have to be collected in the collection box 100. For example, a new belt conveyor for transporting the discharged material may be disposed directly below the third opening 713, the discharge section 26, and the discharge section 93c of the magnetic separator 93. The belt conveyor in this modified example is a mechanism for transporting the discharged material, including the chips Ch discharged from the chip filtering device 10, to a designated disposal location.

The secondary discharge material E2 discharged from the discharge portion 93c of the magnetic separator 93 may be collected in a collection box separate from the collection box 100. The collection box 100 collects the chips Ch discharged from the third opening 713 and the chips Ch discharged from the discharge portion 26. If the primary storage tank 20 and the secondary storage tank 30 are separate, the chips Ch discharged from the third opening 713 and the chips Ch discharged from the discharge portion 26 may be collected in separate collection boxes.

○ In the longitudinal direction of the primary storage tank 20, the distance between the second pump P2 and the communication port 28 may be smaller than the distance between the first pump P1 and the communication port 28. When making such a change, it is advisable to start sucking the secondary cutting oil L2 with the second pump P2 after filtering the chips Ch contained in the secondary cutting oil L2 to a certain extent with the cyclone separator 91. This makes it difficult for tiny chips Ch to return to the machine tool.

○ A part of the primary conveyor housing section 70 does not have to be housed in the primary storage tank 20. The primary conveyor housing section 70 and the primary storage tank 20 may be separate. In this case, the primary cutting oil L1 discharged from the primary conveyor housing section 70 may be discharged into the primary storage tank 20 through a new flow path connecting the primary conveyor housing section 70 and the primary storage tank 20. The primary conveyor housing section 70 and the primary conveyor 60 may be omitted.

The other end of the fourth flow path member R4 was attached to the communication hole 271a of the first wall 271, but this is not limited to this. For example, the communication hole 271a may be formed in the inclined wall 23. In short, as long as the secondary return oil Lr2 discharged from the magnetic separator 93 is returned to the primary storage tank 20, the position of the other end of the fourth flow path member R4 may be changed as appropriate.

Although the bracket Br is fixed to the third housing portion 73 of the primary conveyor housing portion 70 in the above embodiment, the present invention is not limited to this. For example, the bracket Br may be fixed to the housing portion 29.
The cyclone separator 91 does not have to be attached to the bracket Br. The cyclone separator 91 may be directly fixed to the accommodation section 29 or the primary conveyor accommodation section 70. The manner in which the cyclone separator 91 is attached may be changed as appropriate. However, the cyclone separator 91 is disposed so as to be located above the magnetic separator 93.

The magnetic separator 93 may be fixed to the cover 22. The magnetic separator 93 may be fixed to the accommodation portion 29.
The magnetic separator 93 may be fixed to the primary conveyor housing 70. The manner in which the magnetic separator 93 is attached may be changed as appropriate. However, the magnetic separator 93 is disposed so as to be located lower than the cyclone separator 91.

10...Chip filtration device, 20...Primary storage tank, 26...Discharge section, 28...Communication port, 29...Storage section, 30...Secondary storage tank, 40...Drum filter, 50...Clean tank, 55...Primary storage tank, secondary storage tank, and bottom of clean tank, secondary storage tank, and bottom of clean tank, 85...Second belt as belt, 85a...Upper part of second belt, 85b...Lower part of second belt, 86...Scraper, 91...Cyclone separator, 93...Magnetic separator, 100...Collection box, Ch...Chips, L...Cutting oil, L1...Primary cutting oil, L2...Secondary cutting oil, E1...Primary discharge, Lr1...Primary return oil, E2...Secondary discharge, Lr2...Secondary return oil.

Claims (2)

A primary storage tank in which a primary cutting oil containing cutting chips is stored;
an endless belt having a scraper attached thereto for collecting the chips that reach the bottom of the primary storage tank;
a drum filter, which is a cylindrical filter member that is contained in the primary storage tank and filters the chips from the primary cutting oil, and is disposed between an upper stage portion of the belt and a lower stage portion of the belt;
a secondary storage tank in which a secondary cutting oil obtained by filtering the cutting chips from the primary cutting oil by the drum filter is stored;
A cyclone separator for further filtering the chips from the secondary cutting oil, the cyclone separator separating the secondary cutting oil into a primary discharge containing the chips and a primary return oil;
a clean tank in which the primary return oil is stored;
A chip filtering device for further filtering the chips from the primary discharge, the device comprising: a magnetic separator that magnetically attracts the chips to separate the primary discharge into a secondary discharge containing the chips and a secondary return oil that is returned to the primary storage tank. A portion of the primary storage tank is contained in the secondary storage tank,
The primary storage tank has a communication port for discharging the secondary cutting oil into the secondary storage tank,
The primary storage tank includes:
a receiving portion extending upward from the bottom in a longitudinal direction of the belt while being separated from the drum filter, and receiving a part of the belt;
a discharge section that discharges the chips collected by the scraper from the storage section as the lower section of the belt passes through the storage section,
The magnetic separator is fixed to the housing,
The chip filtering device according to claim 1 , wherein the secondary discharge and the chips discharged from the discharge section are collected in a same collection box.

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