JP2014034081A - Separation tank, and liquid cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separation tank and a liquid cleaning device capable of suppressing the contamination of a contained liquid from being contaminated with a floating foreign substance.SOLUTION: A liquid cleaning device comprises: a first separation tank 28 having a non-linear flow passage 32 opened upward for causing a coolant liquid to flow from an upstream side to a downstream side, and a first recess 80 for causing the coolant liquid to overflow from the flow passage 32; a second separation tank 33 formed adjacent to the first separation tank 28, for receiving and reserving the coolant liquid having overflown through the first recess 80 from the first separation tank 28, and having a second recess 84 for causing the coolant liquid reserved to overflow; and an oil recovery tank 35 formed adjacent to the second separation tank 33, for separating and recovering the oil having overflown through the second recess 84 from the second separation tank 33.

Description

  The present invention relates to a separation tank that separates floating foreign substances from a liquid containing floating foreign substances such as oil and suspended particulate matter, and a liquid purification apparatus including the separation tank.

  Conventionally, coolant has been supplied to the workpiece in order to cool the workpiece, improve the lubrication of the workpiece against the cutting tool, and eliminate cutting and grinding debris from the workpiece. However, machine tools that perform processing such as cutting and grinding are widely known. In such a machine tool, in order to reduce the amount of coolant liquid used and the amount discarded, it is desired to lengthen the period during which the coolant liquid can be used. However, the coolant liquid used for processing may contain fine foreign matter such as fine cutting scraps and grinding scraps of the workpiece and lubricating oil used in machine tools. And there existed a problem that a coolant liquid will be contaminated gradually, when such a floating foreign material promotes corruption. Therefore, in recent years, a coolant liquid purifying apparatus that purifies the coolant liquid used for processing has been developed (for example, see Patent Document 1).

  That is, in the cutting water treatment apparatus (liquid purification apparatus), the filtration tank (separation tank) for filtering used cutting water (liquid) has an inner space area for storing cutting water as an upstream portion and a downstream portion. A partition plate is provided for partitioning. And in this filtration tank, the cutting water is made to flow from the upstream side part to the downstream side part by passing the clearance gap between the lower end part of a partition plate, and the bottom part of a filtration tank. Therefore, the partition plate restricts the movement of cutting waste and oil contained as floating foreign substances in the cutting water from the upstream side portion to the downstream side portion of the filtration tank.

JP 2006-88240 A

  By the way, in the filtration tank in said cutting water treatment apparatus, the floating foreign material blocked | blocked with the partition plate accumulate | stores in the liquid level of the coolant liquid accommodated in the upstream part rather than the partition plate of a filtration tank. Therefore, when the cutting water treatment apparatus is not operated for a long period of time and the cutting water stored in the filtration tank does not flow for a long period of time, the cutting water stored in the filtration tank is not floating foreign matter. Is cut off from the atmosphere. As a result, the oxygen dissolved in the cutting water is insufficient, or the cutting waste deposited at the bottom of the filtration tank becomes a nutrient source, which promotes the growth of anaerobic bacteria and advances the decay of the cutting water. There was a problem that the period in which the device can be used becomes short.

  This invention is made | formed in view of such a situation, The objective is to provide the separation tank and liquid purification apparatus which can suppress that the accommodated liquid is contaminated with a floating foreign material. .

  A separation tank that solves the above-described problem is a separation tank that separates floating foreign substances contained in a liquid from a liquid that is used when processing a workpiece with a machine tool. A first separation part having a non-linear flow path part opened upward to flow toward the side, and a first overflow part for overflowing the liquid from the flow path part; The floating foreign matter that is provided adjacent to the one separation portion, receives and stores the liquid overflowing from the first separation portion via the first overflow portion, and floats on the liquid surface of the stored liquid. A second separation part formed with a second overflow part to be overflowed, and the floating property provided adjacent to the second separation part and overflowing from the second separation part via the second overflow part And a third separation unit that separates and collects foreign matters from the liquid.

In the separation tank, it is preferable that the second separation part has a smaller area in plan view than the first separation part.
The separation tank preferably further includes a liquid level adjustment unit that adjusts the height of the liquid level of the liquid in the flow path unit of the first separation unit.

  In the separation tank, the liquid that is provided adjacent to the second separation part and separates and discharges the floating foreign matter from the second separation part through a part different from the second overflow part. The fourth separation part to be collected, the partition wall partitioning the fourth separation part and the second separation part, and provided on the partition wall, the fourth separation part and the second separation part can communicate with each other And a switching valve that is provided in the communication part and switches a communication state between the fourth separation part and the second separation part, and the switching valve is stored in the second separation part. It is preferable that when the liquid level of the liquid that has reached the height overflowing the third separation part through the second overflow part is displaced from the valve closing position to the valve opening position.

  In the separation tank, the switching valve is connected to the float body floating on the liquid surface of the liquid stored in the second separation section, and is connected to the float body. It is preferable to have a valve body that is displaced between a valve closing position that closes the opening on the second separation portion side and a valve opening position that opens the opening.

  Moreover, the liquid purification apparatus which solves the said subject is the separation tank of the said structure which receives the liquid supplied from the accommodating part which accommodates the liquid used in the case of the process to the workpiece by a machine tool, and the said separation tank And a reflux part for refluxing the liquid that has been separated and purified from floating foreign substances from the separation tank to the storage part.

  It can suppress that the accommodated liquid is contaminated with a floating foreign material.

The schematic diagram which shows the piping structure of the coolant purification apparatus of 1st Embodiment. The schematic diagram which shows the flow of the coolant liquid and a floating foreign material in the coolant liquid purification apparatus of the embodiment. The schematic diagram which shows the flow of coolant liquid at the time of backwashing of a primary filter in the coolant purification apparatus of the embodiment. The perspective view of the floating foreign material collection | recovery apparatus of the embodiment. The front sectional view of the floating foreign material collection device of the embodiment. The cross-sectional view of the floating foreign material collection apparatus of the same embodiment. The perspective view of the separation tank of the embodiment. Sectional drawing which shows the separation tank of the embodiment typically. (A) The principal part enlarged view which shows typically the separation tank in the state where a float valve exists in a valve closing position, (b) The principal part expansion which shows the separation tank in a state where a float valve exists in a valve opening position schematically Figure. It is a schematic diagram which shows the effect | action of the floating foreign material collection apparatus at the time of collect | recovering a floating foreign material, Comprising: (a) is a schematic diagram which shows the state before a floating foreign material is received by a receiving tray, (b) is a floating foreign material. The schematic diagram which shows the state in the middle of being received by the saucer, (c) The schematic diagram which shows the state after a floating foreign material was received by the saucer. It is a schematic diagram which shows the effect | action of the parallel link mechanism when a float member moves up, Comprising: (a) is a schematic diagram which shows the state before a float member moves up, (b) is after a float member moves up The schematic diagram which shows the state of. It is a schematic diagram which shows the effect | action of the separation tank at the time of isolate | separating oil from a coolant liquid, Comprising: (a) is a schematic diagram which shows the state which oil floated to the liquid level of the coolant liquid which flows through a flow-path part, (b). Is a schematic diagram showing a state in which the coolant and oil have overflowed from the flow path portion to the second separation tank, and (c) is a schematic diagram showing a state in which the coolant and oil have further overflowed from the state shown in FIG. FIG. 4D is a schematic diagram illustrating a state where oil overflows from the second separation tank, and FIG. 5E is a schematic diagram illustrating a state after oil overflows from the second separation tank. The schematic diagram which shows the piping structure of the coolant liquid purification apparatus of 2nd Embodiment. The schematic diagram which shows the flow of coolant liquid at the time of backwashing of a primary filter in the coolant purification apparatus of the embodiment.

(First embodiment)
Hereinafter, 1st Embodiment which concerns on a separation tank and a liquid purification apparatus provided with the same is described.
As shown in FIG. 1, a coolant liquid purification apparatus 10 as an example of a liquid purification apparatus in the present embodiment is a coolant used for cooling a workpiece when the machine tool 11 cuts the workpiece. It is an apparatus for purifying liquid. And the coolant liquid purification apparatus 10 was collect | recovered by the floating foreign material collection | recovery apparatus 13 which collect | recovers the coolant liquid accommodated in the storage tank 12 as an example of an accommodating part with a floating foreign material, and the floating foreign material collection apparatus 13 And a separation tank 14 for separating the coolant liquid from the floating foreign matter.

  In the storage tank 12, a region for storing the coolant liquid is partitioned into a first region 16 and a second region 17 by a wall portion 15. In addition, a communication portion 18 that connects these regions 16 and 17 in the storage tank 12 is formed in the middle portion of the wall portion 15 in the height direction.

  Further, an upstream end of a supply path 20 having a pressurizing pump 19 in the middle of the flow path is inserted into the first region 16 of the storage tank 12, and a downstream end of the supply path 20 is connected to the machine tool 11. Yes. The coolant liquid stored in the first region 16 of the storage tank 12 is supplied to the machine tool 11 through the supply path 20 as the pressurizing pump 19 is driven.

  Further, the coolant used in the machine tool 11 is discharged to the second region 17 of the storage tank 12 through the discharge path 21. In this case, in the used coolant liquid, oil components such as the cutting waste of the workpiece and the lubricating oil used in the machine tool 11 are mixed as floating foreign matters. Therefore, the used coolant liquid used in the machine tool 11 is discharged to the second region 17 of the storage tank 12 through the discharge path 21 while containing such floating foreign substances. The floating foreign matter is restricted by the wall 15 from moving from the second region 17 to the first region 16 in the storage tank 12.

  The floating foreign material recovery device 13 is provided corresponding to each of the areas 16 and 17 in the storage tank 12 individually. The floating foreign matter collecting apparatus 13 is connected to an upstream end of a supply path 24 having a first three-way valve 22 and a second three-way valve 23 arranged in series in the middle of the flow path. The downstream end of the supply path 24 is connected to the primary filter 25. The upstream end of a supply path 27 having a third three-way valve 26 in the middle of the flow path is connected to the primary filter 25. The downstream end of the supply path 27 is connected to a secondary filter 29 provided in the first separation tank 28 of the separation tank 14. A pressurizing pump 30 is provided between the primary filter 25 and the third three-way valve 26 in the supply path 27. In this embodiment, by switching the rotational drive direction of the pressurizing pump 30, the coolant liquid is sent in the forward direction from the upstream side to the downstream side and in the opposite direction from the downstream side to the upstream side. It is possible. A branch path 31 is interposed between the second three-way valve 23 and the secondary filter 29.

  The separation tank 14 is discharged from the first separation tank 28 as an example of a first separation section having a flow path section 32 that receives the coolant liquid that has passed through the secondary filter 29, and the flow path section 32 of the first separation tank 28. The second separation tank 33 as an example of the second separation part that receives the coolant liquid to be used, and the coolant as an example of the fourth separation part that recovers the coolant liquid that is separated and discharged from the second separation tank 33 The liquid recovery tank 34 and the oil recovery tank 35 as an example of the 3rd separation part which collects the oil isolate | separated and discharged | emitted from the coolant liquid in the 2nd separation tank 33 are provided. The coolant liquid recovery tank 34 is connected to the first region 16 of the storage tank 12 via a reflux path 36 as an example of a reflux section. The oil recovery tank 35 is connected to a waste oil container 38 via a discharge path 37.

  That is, as shown in FIG. 2, in this embodiment, the coolant liquid (shown by solid line arrows in FIG. 2) discharged from the machine tool 11 is oil (shown by broken line arrows), and the size is small. In the state where small cutting waste (indicated by a one-dot chain line arrow in FIG. 2) and large cutting waste (indicated by a two-dot chain line arrow in FIG. 2) are mixed as floating foreign matters, 2 is discharged to the area 17. Further, when the coolant liquid is sent from the second region 17 of the storage tank 12 toward the separation tank 14, large cutting waste is trapped by the primary filter 25 among the floating foreign substances contained in the coolant liquid. Further, among the floating foreign substances that pass through the primary filter 25 and are sent to the separation tank 14, small cutting waste is captured by the secondary filter 29 of the separation tank 14.

  Further, the oil contained in the coolant liquid that has passed through the secondary filter 29 is sent from the flow path portion 32 to the second separation tank 33. Further, the coolant liquid and the oil fed into the second separation tank 33 are separated from each other in the second separation tank 33, and then the coolant liquid is sent to the coolant liquid recovery tank 34 and the oil is recovered from the oil recovery tank. 35. Then, the coolant liquid recovered in the coolant liquid recovery tank 34 is returned to the first region 16 of the storage tank 12. The oil recovered in the oil recovery tank 35 is recovered in a waste oil container 38.

  By the way, when the coolant purification apparatus 10 of this embodiment is operated over a long period of time, the primary filter 25 may be clogged with large cutting waste to be captured. In this case, in the present embodiment, as shown in FIG. 3, the pressurizing pump 30 supplies the coolant liquid stored in the flow path portion 32 of the first separation tank 28 from the downstream side to the upstream side through the supply path 39 and the supply path 27. The primary filter 25 is back-washed by sending it in the reverse direction. Then, the coolant used for back washing of the primary filter 25 is discharged to the secondary filter 29 through the second three-way valve 23 and the branch path 31.

Next, the configuration of the floating foreign material recovery apparatus 13 will be described.
As shown in FIGS. 4 to 6, the floating foreign material recovery apparatus 13 is attached to the storage tank 12 via a parallel link mechanism 40. The parallel link mechanism 40 has a bracket 41 attached to the inner surface of the storage tank 12. One end side in the longitudinal direction of a pair of links 42 arranged in parallel with each other at a distance in the vertical direction is attached to the bracket 41 by a fixing bolt 43 so as to be rotatable. The other end side in the longitudinal direction of the pair of links 42 is rotatably attached to a bracket 45 attached to the outer surface of the discharge pipe 44 as an example of the first flow path portion by a fixing bolt 46. Yes.

  Note that the base end side of the arm portion 47 is connected to a midway portion in the longitudinal direction of the link 42 on one side (upper side in the present embodiment) in the parallel link mechanism 40. The arm portion 47 obliquely intersects the longitudinal direction of the link 42 and is fixed so as not to move relative to the link 42. A balancer 48 is attached to the tip of the arm portion 47.

  The discharge pipe 44 has a hollow substantially cylindrical shape, and a lower end portion which is one end side in the longitudinal direction is fitted inside a connecting member 50 having a bottomed substantially cylindrical shape opened on the upper side. In addition, communication holes 51 as an example of a recovery port that communicates the inside and the outside of the discharge pipe 44 are formed at two locations on the outer surface of the portion of the discharge pipe 44 that is fitted inside the connecting member 50. These communication holes 51 are arranged at positions opposite to each other across the diameter center of the discharge pipe 44. A through hole 52 is formed on the outer surface of the connecting member 50 at a position corresponding to the communication hole 51 of the discharge pipe 44. That is, the communication hole 51 of the discharge pipe 44 opens to the outside of the connection member 50 through the through hole 52 formed in the connection member 50. Further, a fitting convex portion 53 projects downward from the bottom surface of the connecting member 50, and the fitting convex portion 53 is fitted to a fitting concave portion 55 provided on the float member 54.

  The float member 54 has a hollow, substantially rectangular parallelepiped shape, and a tray 56 is integrally formed with the float member 54 at one end side in the longitudinal direction on the upper surface thereof. The tray 56 has a concave portion 57 whose upper portion is opened as a receiving portion, and the inner surface of the concave portion 57 is smoothly curved like a bowl. Moreover, the opening edge 57a of the recessed part 57 used as the receptacle of the receiving tray 56 makes a downward slope from the one side (left side in FIG. 5) of the upper surface of the float member 54 to the other side (right side in FIG. 5). In this manner, the float member 54 is inclined with respect to the upper surface. And the fitting recessed part 55 is formed in the inner bottom face located in the lowest end in the recessed part 57 of the saucer 56. FIG. When the fitting convex portion 53 of the connecting member 50 is fitted into the fitting concave portion 55 of the float member 54, the communication hole 51 of the discharge pipe 44 is the same as the lowest end of the concave portion 57 of the tray 56. In the height position, it communicates with the recess 57 of the tray 56 through the through hole 52 of the connecting member 50.

  In addition, the upper end of the discharge pipe 44 on the other end side in the longitudinal direction is discharged as an example of a second flow path portion made of an elastic material having flexibility through a joint 60 bent in a substantially L shape. A hose 61 is connected. That is, the connection part via the joint 60 with respect to the discharge pipe 44 in the discharge hose 61 extends horizontally.

Next, the configuration of the separation tank 14 will be described.
As shown in FIGS. 7 and 8, the separation tank 14 includes a bottomed substantially rectangular box-shaped housing 70 whose upper side is open. A partition wall 71 is provided at a substantially central position in the lateral direction X of the housing 70. The partition wall 71 partitions the space area inside the housing 70 in the lateral direction X of the housing 70. A space area on one side (left side in FIG. 7) having a substantially rectangular parallelepiped shape partitioned by the partition wall 71 in the housing 70 constitutes the first separation tank 28.

  The first separation tank 28 has a receiving member 72 having a substantially rectangular box shape with a bottom opened on the upper side, and a secondary filter 29 is provided inside the receiving member 72. Above the receiving member 72, the discharge port of the discharge pipe 73 that forms the downstream end of the supply path 27 and the discharge port of the discharge pipe 74 that forms the downstream end of the branch path 31 are open above the receiving member 72. It is arranged to face. When the coolant liquid is discharged from the discharge pipe 73 and the discharge pipe 74 into the receiving member 72, small cutting waste contained as floating foreign matters in the coolant liquid is captured by the secondary filter 29. On the other hand, the oil contained as a floating foreign substance in the coolant liquid is formed on the inner bottom surface of the receiving member 72 after passing through the secondary filter 29 together with the coolant liquid without being captured by the secondary filter 29. Then, it is discharged below the receiving member 72 through the discharge hole 75 (see FIG. 8).

  A guide plate 76 is provided below the receiving member 72. The guide plate 76 has a width dimension substantially the same as the dimension in the longitudinal direction Y of the first separation tank 28, and vertically partitions a space area located below the receiving member 72 in the first separation tank 28. Further, the guide plate 76 is horizontal so that the front end side farther from the partition wall 71 is lower than the base end side near the partition wall 71 in the short direction X of the first separation tank 28, and the front descending slope is downward. Inclined with respect to direction. Then, the coolant and oil discharged from the receiving member 72 flow down along the upper surface of the guide plate 76 and then flow into the flow path portion 32 provided below the guide plate 76.

  A plurality (seven in this embodiment) of inclined plates 77 are extended in the flow path portion 32 so as to be arranged in parallel from the inner bottom surface of the first separation tank 28 obliquely upward. These inclined plates 77 are inclined so as to rise upward from the upstream portion into which the coolant liquid flows in the flow path portion 32 toward the downstream portion. The inclined plate 77 is formed with a penetrating portion 78 penetrating in the thickness direction of the inclined plate 77. And in the flow path part 32, the inclined plate 77 in which the penetrating part 78 is formed at the upper position and the inclined plate 77 in which the penetrating part 78 is formed in the lower position are the first separation tank. 28 are arranged alternately in parallel in the lateral direction. That is, the penetrating portion 78 is formed at a distance in the vertical direction in the inclined plate 77 provided at a position adjacent to the flow path portion 32. Of the inclined plates 77 provided in the flow path portion 32, the upper end portion of the inclined plate 77 located on the most upstream side is connected to the lower surface of the guide plate 76, while the upper end portions of the other inclined plates 77 are The guide plate 76 is disposed at a distance in the vertical direction with respect to the lower surface of the guide plate 76. Therefore, the upper part of the flow path part 32 is open.

  A part of the inner surface of the downstream end portion in the flow path portion 32 is constituted by a partition wall 71. On one end side in the longitudinal direction Y of the partition wall 71, a rectangular cutout 79 is formed so as to cut out the side surface of the partition wall 71. A rectangular first recess 80 is formed at the lower edge of the notch 79. The bottom surface of the first recess 80 is positioned lower than the other portions on the lower edge of the notch 79. Therefore, in the present embodiment, the first recess 80 functions as a first overflow portion that causes the coolant liquid to overflow from the flow path portion 32 when the level of the coolant liquid in the flow path portion 32 rises.

  In addition, the space area on the other side (the right side in FIG. 7) partitioned by the partition wall 71 in the housing 70 is further partitioned in the longitudinal direction Y of the housing 70 by the partition wall 81. The space area on one side (the upper side in FIG. 7) partitioned by the partition wall 81 in the housing 70 constitutes the second separation tank 33. In addition, the space area on the other side (lower side in FIG. 7) partitioned by the partition wall 81 in the housing 70 is further finely partitioned by the partition wall 82. And among the space areas partitioned by the partition wall 82 in the housing 70, the space area on one side arranged close to the first separation tank 28 constitutes the coolant liquid recovery tank 34, and the first separation tank The space area on the other side arranged away from 28 constitutes an oil recovery tank 35.

  The second separation tank 33 stores the coolant liquid that has overflowed from the first separation tank 28 through the first recess 80. The second separation tank 33 has a smaller area in plan view than the first separation tank 28. The second separation tank 33 is adjacent to the downstream end portion of the flow path portion 32 in the first separation tank 28 with the partition wall 71 interposed therebetween.

  Moreover, the 2nd recessed part 84 is formed in the upper end edge of the wall part which partitions off the 2nd separation tank 33 and the oil recovery tank 35 in the partition wall 81 as an example of a 2nd overflow part. The inner bottom surface of the second recess 84 has a triangular shape that tapers downward. The lowermost end portion of the second concave portion 84 serving as the apex of the triangular shape is positioned below the bottom surface of the first concave portion 80.

  The partition wall 81 is provided with a communication pipe 85 as an example of a communication portion that allows the second separation tank 33 and the coolant recovery tank 34 to communicate with each other. The communication pipe 85 has a hollow cylindrical shape, and the communication path formed therein has an opening at one end facing the second separation tank 33 and an opening at the other end facing the coolant recovery tank 34. Yes. The second separation tank 33 is provided with a float valve 90 that opens and closes the opening of the communication pipe 85 on the second separation tank 33 side as an example of a switching valve.

  As shown in FIG. 9A, the float valve 90 includes a float body 91 that floats the liquid level of the coolant liquid in the second separation tank 33 (the oil level of the floating oil in FIG. 9), and a float body 91. On the other hand, it has a valve body 92 connected from below. When the height of the coolant level in the second separation tank 33 varies, the float body 91 can be displaced up and down following this variation.

  And as shown in FIG.9 (b), when the height of the liquid level of the coolant liquid in the 2nd separation tank 33 raises the float valve | bulb 90, the float body 91 will raise following this fluctuation | variation. Then, the valve body 92 is arranged at the valve opening position away from the opening edge of the opening on the second separation tank 33 side in the communication pipe 85.

  7 and 8, the coolant recovery tank 34 is provided with a cylindrical member 95 as an example of a liquid level adjustment unit. The cylindrical member 95 has a hollow cylindrical shape, and a nut member 96 having an internal thread portion (not shown) formed on the inner peripheral surface thereof, and an external thread portion that is screwed into the female thread portion of the nut member 96 is formed on the outer peripheral surface thereof. And a bolt member 97 having a hollow cylindrical shape. When the bolt member 97 is screwed into the nut member 96, the space area inside the bolt member 97 communicates with the space area inside the nut member 96. The communicated space area communicates with the flow path portion 32 of the first separation tank 28 through a connection pipe 98 connected to the lower end portion of the cylindrical member 95. Therefore, the height of the coolant level W stored in the flow path portion 32 of the first separation tank 28 is the same height as the opening 97 a at the upper end of the bolt member 97. Then, by changing the screwing amount of the bolt member 97 with respect to the nut member 96, the protruding amount of the bolt member 97 from the nut member 96 is changed. As a result, the height of the opening 97a at the upper end portion of the bolt member 97 is adjusted, so that the height of the coolant level W stored in the flow path portion 32 of the first separation tank 28 is adjusted. .

  Next, regarding the operation of the coolant liquid purification device 10 configured as described above, in particular, when the floating foreign material recovery device 13 recovers the floating foreign material from the liquid level of the coolant liquid stored in the storage tank 12. The following description will focus on the action.

  As shown in FIG. 10A, when the float member 54 floats on the surface of the coolant liquid stored in the storage tank 12, the opening edge 57a of the recess 57 of the tray 56 provided on the float member 54 is It is arranged to be inclined with respect to the liquid surface of the coolant liquid. And the opening edge 57a of the recessed part 57 of the receiving tray 56 is partially arrange | positioned below the liquid level of coolant liquid. Therefore, in the tray 56, the lowermost end portion of the opening edge 57a of the recess 57 is disposed below the coolant level. Further, since the communication hole 51 of the discharge pipe 44 is located below the opening edge 57a of the recess 57, it is disposed below the coolant level.

  Here, when the coolant liquid flows from the storage tank 12 toward the separation tank 14 as the pressurizing pump 30 is driven, the coolant liquid is discharged through the communication hole 51 as shown by an arrow in FIG. Sucked inside. Then, the floating foreign matter P floating on the liquid surface of the coolant liquid flows on the flow of the coolant liquid toward the communication hole 51, so that the lowermost end portion at the opening edge 57 a of the recess 57 of the tray 56. Passing upwards into the recess 57.

  Then, as shown in FIG. 10C, the floating foreign matter P flows into the inside of the concave portion 57 of the receiving tray 56 and is then sucked into the inside of the discharge pipe 44 through the communication hole 51. As a result, the floating foreign matter P is collected from the storage tank 12 together with the coolant.

  By the way, in this embodiment, the opening edge 57a of the recessed part 57 of the receiving tray 56 is inclined and arrange | positioned with respect to the liquid level of coolant liquid. Therefore, the recess 57 of the tray 56 has a coolant liquid at the lowermost end at the opening edge 57a of the recess 57, as compared with the case where the opening edge of the recess is disposed horizontally with respect to the liquid surface of the coolant. It will be in a state where it sinks further below the surface. As a result, even if the level of the coolant liquid fluctuates, it is easy to maintain a state where the lowermost end portion of the opening edge 57a of the recess 57 of the tray 56 is positioned below the coolant level. Accordingly, the floating foreign matter P floating on the liquid surface of the coolant liquid easily passes over the opening edge 57a of the recess 57 of the tray 56 and is received in the recess 57 of the tray 56, and as a result, is collected by the discharge pipe 44. It becomes easy to be done. Therefore, the floating foreign matter P is efficiently recovered from the coolant level.

  Further, as shown in FIG. 11A, when the float member 54 floats on the coolant level, the discharge pipe 44 has its longitudinal direction aligned with the vertical direction so as to be orthogonal to the coolant level. Arranged in a state. Further, in the state shown in FIG. 11A, the balancer 48 is disposed vertically above the fixing bolt 43 serving as the rotation center of the link 42 on the storage tank 12 side. That is, the balancer 48 and the fixing bolt 43 are disposed on the same straight line L1 extending in the vertical direction.

  Here, as shown in FIG. 11 (b), when the level of the coolant liquid rises, the float member 54 moves up following this fluctuation. In this case, since the discharge pipe 44 is attached to the inner side surface of the storage tank 12 via the parallel link mechanism 40, the discharge pipe 44 is inclined upward while maintaining the state in which the longitudinal direction thereof coincides with the vertical direction. Move up.

  Further, when the discharge pipe 44 moves up, a reaction force F acts on the discharge pipe 44 from the discharge hose 61 via the joint 60 based on the elastic force of the discharge hose 61. Since this reaction force F acts diagonally downward in the direction opposite to the displacement direction of the discharge pipe 44, the link 42 tries to rotate downward about the fixing bolt 43. As a result, since the upward movement of the discharge pipe 44 is hindered, there is a possibility that the float member 54 connected to the discharge pipe 44 cannot suitably follow the fluctuation of the coolant level.

  In this regard, in the present embodiment, when the discharge pipe 44 moves upward, the balancer 48 is integrated with the link 42 and rotates around the fixing bolt 43. Then, the balancer 48 is disposed at a position farther away from the discharge pipe 44 in the horizontal direction than the fixing bolt 43. Then, the balancer 48 tries to rotate the link 42 upward around the fixing bolt 43 based on the gravity G. That is, the balancer 48 changes the magnitude of the rotational moment that acts on the link 42 around the fixing bolt 43. As a result, the rotational moment acting on the link 42 based on the reaction force F is canceled. Therefore, it becomes possible for the float member 54 connected to the discharge pipe 44 to suitably follow the fluctuation of the coolant level.

Next, the operation when the separation tank 14 separates and collects oil from the coolant liquid will be described.
Now, as shown in FIG. 12A, the coolant liquid passes through the non-linear flow path portion 32 while meandering up and down, so that the time required for the coolant liquid to pass through the flow path portion 32 is long. Become. As a result, oil which is a floating foreign substance having a low specific gravity contained in the coolant liquid easily floats above the flow path portion 32. In this case, since the upper part of the flow path part 32 is opened, the liquid level of the coolant liquid is continuous above the flow path part 32, and the oil floats on the liquid level of the coolant liquid.

  Subsequently, when the coolant liquid further flows into the flow path portion 32 from the receiving member 72, the level of the coolant liquid in the flow path portion 32 increases as shown in FIG. Then, the coolant liquid accommodated in the flow path portion 32 overflows into the second separation tank 33 together with the oil.

  And as shown in FIG.12 (c), the coolant liquid overflowed from the flow-path part 32 is stored in the 2nd separation tank 33. FIG. In this case, since the area of the second separation tank 33 in plan view is smaller than that of the first separation tank 28, the oil J layer floating on the liquid surface of the coolant liquid in the second separation tank 33 is thick.

  Subsequently, as shown in FIG. 12D, when the coolant liquid further overflows from the flow path portion 32 to the second separation tank 33, the level of the coolant liquid in the second separation tank 33 increases. Then, the height of the liquid level of the oil J floating on the liquid level of the coolant liquid further increases. When the level of the oil J reaches a level higher than the lowermost end of the second recess 84, the oil J overflows into the oil recovery tank 35 through the second recess 84. Therefore, the oil J is separated and recovered from the coolant liquid stored in the second separation tank 33.

  Further, the float valve 90 moves from the closed position to the open position when the level of the oil J in the second separation tank 33 reaches the height at which the oil recovery tank 35 overflows via the second recess 84. Displace. Then, the second separation tank 33 and the coolant recovery tank 34 communicate with each other via the communication pipe 85. Then, the coolant liquid in the second separation tank 33 is discharged to the coolant liquid recovery tank 34 through the communication pipe 85. As a result, the level of the coolant liquid in the second separation tank 33 is lowered. Therefore, after the oil J floating on the liquid level of the coolant liquid in the second separation tank 33 overflows into the oil recovery tank 35 through the second recess 84, the coolant liquid in the second separation tank 33 is second. Overflow to the oil recovery tank 35 through the recess 84 is suppressed.

  And as shown in FIG.12 (e), when the height of the liquid level of the coolant liquid in the 2nd separation tank 33 falls to the lowest end part of the 2nd recessed part 84, the float valve 90 will be displaced to a valve closing position. . Then, the second separation tank 33 and the coolant liquid recovery tank 34 are not in communication with each other, and the discharge of the coolant liquid through the communication pipe 85 from the second separation tank 33 to the coolant liquid recovery tank 34 is stopped.

According to the first embodiment, the following effects can be obtained.
(1) The light specific gravity oil contained as a floating foreign substance in the coolant liquid floats on the surface of the coolant liquid connected above the flow path portion 32. As a result, the coolant liquid stored in the first separation tank 28 overflows into the second separation tank 33 through the first recess 80 together with the oil. Further, when the liquid level of the coolant liquid stored in the second separation tank 33 rises, the oil J floating on the liquid level of the coolant liquid overflows into the oil recovery tank 35 via the second recess 84. Therefore, since the oil J is separated and recovered from the coolant liquid stored in the second separation tank 33, it is possible to prevent the coolant liquid stored in the separation tank 14 from being contaminated by the oil.

  (2) Since the second separation tank 33 has a smaller area in plan view than the first separation tank 28, the thickness of the layer of oil J floating on the liquid level of the coolant liquid stored in the second separation tank 33 is Become thicker. Therefore, the oil J floating on the coolant level stored in the second separation tank 33 is efficiently separated and recovered in the oil recovery tank 35 through the second recess 84, and thus is stored in the separation tank 14. It can suppress more reliably that the coolant liquid which is being contaminated with oil.

  (3) The cylinder member 95 adjusts the height of the liquid level W of the coolant liquid in the flow path portion 32, so that the coolant liquid overflowing from the flow path portion 32 to the second separation tank 33 through the first recess 80. The flow rate can be adjusted.

  (4) When the oil J floating on the coolant level in the second separation tank 33 starts to overflow into the oil recovery tank 35 through the second recess 84, the float valve 90 is displaced from the valve closing position to the valve opening position. To do. Then, since the second separation tank 33 and the coolant recovery tank 34 communicate with each other through the communication pipe 85, the coolant liquid stored in the second separation tank 33 is discharged to the coolant recovery tank 34 through the communication pipe 85. The As a result, the coolant level stored in the second separation tank 33 falls. Therefore, the coolant liquid stored in the second separation tank 33 after the oil J floating on the liquid level of the coolant liquid in the second separation tank 33 overflows into the oil recovery tank 35 through the second recess 84. Can be prevented from overflowing into the oil recovery tank 35 via the second recess 84.

  (5) When the level of the coolant liquid stored in the second separation tank 33 increases, the oil J floating on the liquid level of the coolant liquid in the second separation tank 33 passes through the second recess 84 and becomes oil. It begins to overflow into the collection tank 35. Then, the height of the float body 91 floating on the liquid surface of the coolant liquid rises, so that the valve body 92 connected to the float body 91 is displaced from the valve closing position to the valve opening position. Therefore, the height of the liquid level of the oil J floating on the liquid level of the coolant liquid in the second separation tank 33 is such that it overflows from the second separation tank 33 to the oil recovery tank 35 via the second recess 84. When it reaches, the structure which the float valve 90 displaces from a valve closing position to a valve opening position is realizable with a simple structure.

  (6) By reusing the coolant liquid, which has been purified by separating oil and cutting waste in the separation tank 14, when the machine tool 11 processes the workpiece, the amount of coolant liquid used and the amount of waste can be reduced. Can be reduced.

  (7) In the case where the float member 54 floats on the surface of the coolant liquid, the receiving tray 56 is arranged such that the opening edge 57a of the recess 57 is inclined with respect to the horizontal direction. Therefore, even when the liquid level of the coolant liquid in the storage tank 12 fluctuates, the state where the lowermost end portion of the opening edge 57a of the recess 57 of the receiving tray 56 is positioned below the liquid level of the coolant liquid is maintained. It becomes easy. Therefore, floating foreign matters such as oil floating on the liquid surface of the coolant liquid can easily get over the opening edge 57a of the recess 57 of the tray 56 and be received in the recess 57 of the tray 56. As a result, the discharge pipe 44 It becomes easy to collect. Therefore, floating foreign substances can be efficiently and stably recovered from the surface of the coolant liquid.

  (8) The communication hole 51 for collecting the coolant liquid from the tray 56 in the discharge pipe 44 is located below the lowermost end portion of the opening edge 57 a of the recess 57 of the tray 56. Therefore, the discharge pipe 44 can smoothly discharge and collect the floating foreign matter received by the receiving tray 56 from the receiving tray 56 through the communication hole 51.

  (9) The storage tank 12 is provided with a parallel link mechanism 40 that moves the float member 54 in the vertical direction. Therefore, it is possible to reliably maintain the state in which the opening edge 57a of the concave portion 57 of the tray 56 is arranged in an inclined posture with respect to the coolant level.

  (10) The movable portion of the parallel link mechanism 40 is positioned above the coolant level in the storage tank 12. Therefore, it is possible to prevent the oil or cutting waste floating as the floating foreign matter P on the surface of the coolant liquid in the storage tank 12 from entering the movable portion of the parallel link mechanism 40 and causing the malfunction of the parallel link mechanism 40. Is done. Accordingly, the parallel link mechanism 40 can cause the float member 54 to stably follow the fluctuation in the height of the coolant level.

  (11) The movable portion of the parallel link mechanism 40 and the discharge hose 61 are positioned above the coolant level in the storage tank 12. Therefore, it is not necessary to secure a space for arranging the movable part of the parallel link mechanism 40 or a space for routing the discharge hose 61 in the storage tank 12. Therefore, even when the depth of the storage tank 12 is shallow, floating foreign substances can be recovered from the coolant liquid stored in the storage tank 12.

  (12) The balancer 48 changes the magnitude of the rotational moment that acts on the link 42 around the connecting portion on the storage tank 12 side in the link 42, thereby causing the link 42 by the force acting on the discharge pipe 44 from the discharge hose 61. Cancels the rotational moment. As a result, the float member 54 follows the fluctuation of the liquid level of the coolant well. Therefore, even if the liquid level of the coolant liquid stored in the storage tank 12 fluctuates, floating foreign matters can be recovered from the coolant liquid stored in the storage tank 12 more efficiently.

(Second Embodiment)
Next, a second embodiment will be described. The second embodiment is different from the first embodiment in that a bubble generation mechanism that generates bubbles in the storage tank is provided. Therefore, in the following description, a configuration that is different from the first embodiment will be mainly described, and a configuration that is the same as or equivalent to that of the first embodiment will be denoted by the same reference numeral, and redundant description will be omitted.

  As shown in FIG. 13, the bubble generating mechanism 100 has a supply path 103 having a pressurizing pump 101 and an on-off valve 102 in the middle of the flow path. A suction member 104 that sucks coolant liquid from the first region 16 of the storage tank 12 is connected to an upstream end of the supply passage 103 that is inserted into the first region 16 of the storage tank 12. An intake passage 106 having an intake valve 105 in the middle of the flow path is connected between the suction member 104 and the pressure pump 101 in the supply passage 103. In addition, a nozzle member 107 is connected to the downstream end of the supply path 103 that is inserted into the second region 17 of the storage tank 12.

  When the pressure pump 101 is driven, the coolant liquid stored in the first region 16 of the storage tank 12 is sucked into the supply path 103 through the suction member 104. In this case, as the coolant flows through the supply path 103 from the upstream side toward the downstream side, a negative pressure is generated at the connection portion between the supply path 103 and the intake path 106. Then, air flows into the supply passage 103 from the atmosphere through the intake passage 106 based on the negative pressure, and bubbles are generated in the coolant liquid in the supply passage 103. Then, the nozzle member 107 discharges the coolant liquid containing bubbles to the second region 17 of the storage tank 12. As a result, the floating foreign substances contained in the coolant liquid stored in the second region 17 of the storage tank 12 are efficiently levitated on the surface of the coolant liquid by the bubbles. That is, the bubble generating mechanism 100 functions as a levitation promoting member that promotes the floating foreign substances contained in the coolant liquid to float on the surface of the coolant liquid.

  An upstream end of a branch path 111 having an on-off valve 110 in the middle of the flow path is connected between the pressurizing pump 101 and the on-off valve 102 in the supply path 103, and a downstream end of the branch path 111 is supplied. Connected between the primary filter 25 and the pressure pump 30 in the path 27. In the present embodiment, an on-off valve 112 is interposed between the primary filter 25 and the pressurizing pump 30 in the supply path 27. Further, the pressurizing pump 30 can send the coolant liquid in one direction from the upstream side to the downstream side.

  In the present embodiment, as shown in FIG. 14, the pressurizing pump 101 sends the coolant liquid stored in the first region 16 of the storage tank 12 to the primary filter 25 through the supply path 103 and the branch path 111. The back cleaning of the primary filter 25 is performed. Further, the coolant liquid used for the back cleaning of the primary filter 25 is discharged to the secondary filter 29 through the branch path 31.

According to the second embodiment, the same effects as the effects (1) to (12) of the first embodiment can be obtained.
In addition, you may change said each embodiment into another embodiment as follows.

  -In the said 2nd Embodiment, the floating foreign material contained in a coolant liquid floats to the liquid level of a coolant liquid by stirring the coolant liquid accommodated in the 2nd area | region 17 of the storage tank 12 with a screw or a jet. It is good also as a structure which promotes doing.

  In each of the above embodiments, an electromagnetic valve may be employed as a switching valve that switches the communication state between the second separation tank 33 and the coolant recovery tank 34. In this case, for example, a sensor that detects the height of the coolant level in the second separation tank 33 is provided, and a configuration in which the opening / closing operation of the electromagnetic valve is controlled based on a detection signal from the sensor is adopted. Can do.

  In each of the above embodiments, the switching valve that switches the communication state between the second separation tank 33 and the coolant liquid recovery tank 34 is configured so that the oil level in the second separation tank 33 is oil through the second recess 84. It is good also as a structure which displaces from a valve closing position to a valve opening position at the time of becoming slightly higher than the height which overflows in the collection tank 35.

In each of the above embodiments, the separation tank 14 may omit the cylindrical member 95 that adjusts the height of the coolant level W in the flow path portion 32 of the first separation tank 28.
In each of the above embodiments, the area of the second separation tank 33 in plan view may be set to be approximately the same as that of the first separation tank 28 or may be set larger than the first separation tank 28.

  In each of the above embodiments, the second separation tank 33 is configured to be adjacent to the intermediate part between the upstream end part and the downstream end part in the flow path portion 32 of the first separation tank 28 with the partition wall interposed therebetween. Also good.

In each of the above embodiments, the flow path portion 32 of the first separation tank 28 may be configured to extend while meandering in the horizontal direction.
In each of the above embodiments, the floating foreign matter collecting apparatus 13 may omit the balancer 48.

  In each of the above embodiments, the floating foreign material recovery apparatus 13 may freely float the float member 54 with respect to the coolant level in the storage tank 12 by omitting the parallel link mechanism 40.

  In each of the above embodiments, the communication hole 51 of the discharge pipe 44 may be formed at the same height as the lowest end portion of the opening edge 57a of the recess 57 of the tray 56, or the opening of the recess 57 of the tray 56 You may form above the lowest end part in the edge 57a.

  In each of the above embodiments, the liquid purifier is embodied as the coolant purifier 10 that separates floating foreign substances from the coolant, but may be embodied as a liquid purifier that purifies liquids other than the coolant. Good.

  DESCRIPTION OF SYMBOLS 10 ... Coolant liquid purification apparatus as an example of liquid purification apparatus, 11 ... Machine tool, 12 ... Storage tank as an example of a storage part, 14 ... Separation tank, 28 ... 1st separation tank as an example of a 1st separation part, 32 ... Channel portion, 33 ... Second separation tank as an example of second separation part, 34 ... Coolant liquid recovery tank as an example of fourth separation part, 35 ... Oil recovery tank as an example of third separation part, 36: a reflux path as an example of a reflux part, 80: a recess as an example of a first overflow part, 81: a partition wall, 84 ... a recess as an example of a second overflow part, 85: as an example of a communication part Communication pipe, 90... Float valve as an example of a switching valve, 91... Float body, 92.

Claims (6)

A separation tank that separates floating foreign substances contained in the liquid from the liquid used when processing the workpiece with a machine tool,
A non-linear flow path portion that opens upward to flow the liquid from the upstream side toward the downstream side, and a first overflow portion that overflows the liquid from the flow path portion is formed; 1 separation part;
The floatability that is provided adjacent to the first separation part, receives and stores the liquid overflowing from the first separation part via the first overflow part, and floats on the liquid surface of the stored liquid A second separation part formed with a second overflow part for overflowing foreign matter;
A third separation unit that is provided adjacent to the second separation unit and separates and collects the floating foreign matter overflowing from the second separation unit via the second overflow unit from the liquid. Separation tank characterized by that. The separation tank according to claim 1,
The separation tank, wherein the second separation part has a smaller area in plan view than the first separation part. In the separation tank according to claim 1 or claim 2,
The separation tank further comprising a liquid level adjustment unit that adjusts the height of the liquid level of the liquid in the flow path portion of the first separation unit. In the separation tank according to any one of claims 1 to 3,
A fourth separation unit that is provided adjacent to the second separation unit and collects the liquid discharged by separating the floating foreign substances from the second separation unit via a part different from the second overflow unit. When,
A partition wall that partitions between the fourth separation portion and the second separation portion;
A communication portion provided on the partition wall, the communication portion enabling communication between the fourth separation portion and the second separation portion;
A switching valve that is provided in the communication part and switches a communication state between the fourth separation part and the second separation part,
The switching valve is in a closed position when the liquid level of the liquid stored in the second separation part reaches a height that overflows the third separation part via the second overflow part. The separation tank is characterized by being displaced from the valve position to the valve opening position. The separation tank according to claim 4,
The switching valve is
A float that floats on the liquid surface of the liquid stored in the second separation unit;
A valve that is connected to the float body and is displaced between a valve closing position that closes the opening on the second separation part side in the communication part and a valve opening position that opens the opening as the float body moves up and down. A separation tank having a body. The separation tank according to any one of claims 1 to 5, which receives a liquid supplied from a storage unit that stores a liquid used when processing a workpiece by a machine tool.
A liquid purification apparatus comprising: a reflux unit configured to recirculate the liquid, which is separated and purified from floating foreign substances in the separation tank, from the separation tank to the storage unit.