Coolant treatment device and machine tool

Abstract

This coolant processing device comprises a first tank (31) having a bottom part (32), and a first pipe (71) that is connected to the bottom part (32) and discharges coolant. A peripheral edge area (210) and a central area (220) where the first pipe (71) opens are defined in the bottom part (32). The coolant processing device further comprises: a first coolant discharge unit (160) that discharges coolant such that a coolant swirl is generated on the peripheral edge area (210); a second coolant discharge unit (170) that is provided at a position facing the first coolant discharge unit (160) across the central area (220) in a plan view, and that discharges coolant such that a coolant swirl is generated on the peripheral edge area (210); and a third coolant discharge unit (180) that discharges coolant in a direction toward the central area (220) from the peripheral edge area (210) in a plan view and in a direction avoiding the opening of the first pipe (71) in the central area (220).

Description

[Technical field]

[0001] The present invention relates to a coolant treatment device. [Background technology]

[0002] For example, Japanese Patent Application Laid-Open No. 2010-214487 (Patent Document 1) discloses a coolant tank for storing a coolant containing sludge. A cylindrical flow straightening wall is provided in the central region of the tank bottom, and an annular flow passage is defined between the flow straightening wall and the inner peripheral surface of the tank. Two discharge nozzles are provided in the tank to make the coolant flow in a swirling manner in the annular flow passage.

[0003] Furthermore, Utility Model Registration No. 3129588 (Patent Document 2) discloses a coolant liquid purification device that includes a water tank for storing coolant liquid, a suction pipe located in the center of the water tank for sucking in the coolant liquid, and two spray nozzles for spraying the coolant liquid toward the peripheral wall of the water tank. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-214487 A [Patent Document 2] Utility Model Registration No. 3129588 Summary of the Invention [Problem to be solved by the invention]

[0005] As disclosed in the above-mentioned patent document, there is known a coolant treatment device used for a machine tool, etc. In such a coolant treatment device, foreign matter such as sludge or chips contained in the coolant may accumulate in the tank. In this case, it becomes necessary to manually clean the inside of the tank, and therefore, the maintenance of the coolant treatment device requires a lot of work.

[0006] SUMMARY OF THE PRESENT DISCLOSURE ... An object of the present invention is to solve the above problems and to provide a coolant treatment device capable of efficiently discharging foreign matter such as sludge or chips from inside a tank. [Means for solving the problem]

[0007] A coolant treatment device according to the present invention includes a first tank having a bottom and a side portion rising from a periphery of the bottom and capable of storing coolant in a position surrounded by the side portion above the bottom, and a first pipe connected to the bottom and discharging coolant from the first tank. The bottom defines a peripheral region that runs around the periphery of the bottom, and a central region that is disposed inside the peripheral region and in which the first pipe opens. The coolant treatment device includes a first coolant discharge portion that is disposed above the peripheral region and discharges coolant so as to generate a swirling flow of coolant on the peripheral region, a second coolant discharge portion that is disposed above the peripheral region and is located opposite the first coolant discharge portion across the central region in a top view, and discharges coolant so as to generate a swirling flow of coolant on the peripheral region, and a third coolant discharge portion that is disposed above the peripheral region and discharges coolant in a direction from the peripheral region toward the central region in a top view and in a direction that avoids the opening of the first pipe in the central region.

[0008] According to the coolant treatment device configured in this way, the coolant discharged from the first coolant discharge portion and the second coolant discharge portion generates a swirling flow of coolant on the peripheral region of the bottom, so that foreign matter such as sludge or chips can be moved from the peripheral region to the central region inside the peripheral region. Furthermore, the third coolant discharge portion discharges coolant from the peripheral region toward the central region in a direction that avoids the opening of the first pipe in the central region, as viewed from above, to disturb the foreign matter such as sludge or chips accumulated in the central region, and the sludge can be collected at the opening of the first pipe. This allows the foreign matter such as sludge or chips to be efficiently discharged from the first tank through the first pipe.

[0009] Preferably, the third coolant discharge portion has a coolant discharge port for discharging the coolant, the coolant discharge port opening at a position closer to a lower end of the side portion than to an upper end of the side portion in the up-down direction.

[0010] According to the coolant treatment device configured in this manner, the coolant discharge port opens at a position closer to the bottom, so that foreign matter such as sludge or chips that accumulate in the central region of the bottom can cause greater disturbance.

[0011] Also preferably, the third coolant discharge port is provided at a position spaced above the bottom. According to the coolant treatment device configured in this manner, it is possible to prevent the swirling flow of coolant formed on the peripheral area of ​​the bottom from being blocked by the third coolant discharge portion.

[0012] Also preferably, the third coolant discharge portion discharges the coolant in an obliquely downward direction.

[0013] According to the coolant treatment device configured in this manner, the coolant is discharged from the third coolant discharge portion toward the bottom, so that large disturbances can be caused by foreign matter such as sludge or chips that accumulate in the central region of the bottom.

[0014] Preferably, the third coolant discharge portion has a coolant discharge port that opens flat so that the opening length in the horizontal direction is greater than the opening length in the up-down direction and discharges the coolant.

[0015] With a coolant treatment device configured in this manner, the coolant from the third coolant discharge port can be made to flow more evenly along the surface of the bottom, making it possible to cause greater disturbances due to foreign matter such as sludge or chips that accumulate in the central region of the bottom.

[0016] Preferably, the peripheral region is defined, with the third coolant discharge portion as a boundary, as an upstream region in which the swirling flow of the coolant flows toward the third coolant discharge portion and a downstream region in which the swirling flow of the coolant flows away from the third coolant discharge portion. When a straight line is assumed to connect the third coolant discharge portion and the opening of the first piping in the central region in a top view, the third coolant discharge portion discharges coolant in a direction toward the central region in a range between the straight line and the downstream region.

[0017] According to the coolant treatment device configured in this manner, a coolant flow is generated in the central region of the bottom in a direction along the swirling flow of the coolant, thereby causing disturbance to foreign matter such as sludge or chips that accumulate in the central region.

[0018] Preferably, the peripheral region is defined, with the third coolant discharge portion as a boundary, as an upstream region in which the swirling flow of the coolant flows toward the third coolant discharge portion and a downstream region in which the swirling flow of the coolant flows away from the third coolant discharge portion. When a straight line is assumed to connect the third coolant discharge portion and the opening of the first piping in the central region in a top view, the third coolant discharge portion discharges coolant in a direction toward the central region in a range between the straight line and the upstream region.

[0019] According to the coolant treatment device configured in this manner, a coolant flow is generated in the central area of ​​the bottom in a direction opposite to the swirling flow of the coolant, thereby causing disturbance to foreign matter such as sludge or chips that accumulate in the central area of ​​the bottom.

[0020] Preferably, the coolant processing device further includes a second pipe and a third pipe to which the coolant is supplied. The first coolant discharge portion and the third coolant discharge portion are connected to the second pipe. The second coolant discharge portion is connected to the third pipe.

[0021] According to the coolant treatment device configured in this manner, the coolant is supplied to the first coolant discharge portion and the third coolant discharge portion all at once, so that the coolant treatment device can be simply configured.

[0022] Preferably, the coolant treatment device further includes a filter provided on a flow path of the coolant discharged from the first tank through the first piping.

[0023] According to the coolant treatment device configured in this manner, foreign matter such as sludge or chips discharged from the first tank through the first pipe can be collected by the filter.

[0024] Preferably, the coolant treatment device further includes a second tank for storing coolant discharged from the machine tool body, and a pump for pressurizing the coolant stored in the second tank toward the first coolant discharge portion, the second coolant discharge portion and the third coolant discharge portion.

[0025] With a coolant treatment device configured in this manner, it is possible to efficiently discharge foreign matter such as sludge or chips by using a pump for returning the coolant from the second tank, which stores the coolant discharged from the machine tool body, to the first tank. Effect of the Invention

[0026] As described above, according to the present invention, it is possible to provide a coolant treatment device capable of efficiently discharging foreign matter such as sludge or chips from inside a tank. [Brief description of the drawings]

[0027] [Figure 1] 1 is a system diagram showing a coolant treatment device according to an embodiment of the present invention. [Diagram 2] 2 is a rear view showing a machine tool using the coolant treatment device in FIG. 1. [Diagram 3] FIG. 2 is a side view showing the first tank in FIG. [Figure 4] FIG. 2 is a perspective view showing a first tank in FIG. [Diagram 5] 4 is a cross-sectional view showing the first tank as seen in the direction of the arrow on the two-dot chain line VV in FIG. 3. [Figure 6] FIG. 4 is a perspective view showing a first coolant discharge portion and a third coolant discharge portion. [Figure 7] 7 is a cross-sectional view showing the first coolant discharge portion and the third coolant discharge portion as viewed in the direction of the arrows on line VII-VII in FIG. 6. [Figure 8] 6 is a cross-sectional view showing a modified example of the coolant treatment device in FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the accompanying drawings, in which the same or corresponding components are designated by the same reference numerals.

[0029] Fig. 1 is a system diagram showing a coolant treatment device in an embodiment of the present invention, Fig. 2 is a rear view showing a machine tool using the coolant treatment device in Fig. 1.

[0030] 1 and 2, a coolant treatment device 10 in this embodiment is used in a machine tool 100. The machine tool 100 is a machining center that processes a workpiece by bringing a rotating tool into contact with the workpiece. The machine tool 100 is an NC (Numerical Control) machine tool in which various operations for processing the workpiece are automated by numerical control using a computer.

[0031] It should be noted that the machine tool in which the coolant treatment device of the present invention is used is not limited to a machining center, but may be a lathe that processes a workpiece by bringing a tool into contact with a rotating workpiece, a multi-tasking machine having turning and milling functions, or an AM / SM hybrid machine that is capable of additive manufacturing (AM) processing and subtractive manufacturing (SM) processing of a workpiece.

[0032] The machine tool 100 has a machine tool body 110 and a coolant treatment device 10. The machine tool body 110 processes a workpiece.

[0033] The machine tool main body 110 defines a workpiece machining area 120 and has a main body cover which forms the external appearance of the machine tool 100, a tool holding section (tool spindle) for holding a tool in the machining area 120, and a workpiece holding section (table) for holding a workpiece in the machining area 120.

[0034] The coolant processing device 10 is provided alongside the machine tool body 110. The coolant processing device 10 is a device for processing coolant used for workpiece machining in the machine tool body 110. Coolant discharged from the machine tool body 110 in conjunction with workpiece machining is guided to the coolant processing device 10, which stores the coolant. The coolant processing device 10 purifies the coolant from the machine tool body 110, and supplies the clean coolant to the machine tool body 110 again.

[0035] First, there will be described a system configuration of the coolant processing device 10. The coolant processing device 10 has a chip conveyor 11. The chip conveyor 11 discharges chips and coolant generated in the processing area 120 during workpiece processing to the outside of the machine tool 100.

[0036] The chip conveyor 11 has a cover body 19 and a transport device (not shown). The cover body 19 forms the exterior of the chip conveyor 11. The cover body 19 forms an internal space in which the transport device is disposed. The cover body 19 is provided with a chip receiving opening 13 and a chip discharge opening 16.

[0037] The chip conveyor 11 further has a drum filter 42. The drum filter 42 is housed in the cover body 19. The drum filter 42 is provided on the path of the coolant flow from the chip conveyor 11 toward a second tank 21, which will be described later.

[0038] Drum filter 42 has a cylindrical shape centered on central axis 101. Central axis 101 extends horizontally. Drum filter 42 is supported inside cover body 19 so as to be rotatable around central axis 101. Drum filter 42 is driven to rotate around central axis 101 by power transmitted from a conveying device (not shown).

[0039] The chip conveyor 11 is positioned relative to the machine tool body 110 so that the chip receiving opening 13 opens directly below the machining area 120. Below the chip discharge opening 16, a chip bucket for collecting chips is disposed.

[0040] The chips and coolant discharged from the machining area 120 are received into the cover body 19 through the chip receiving port 13. The chips are transported toward the chip discharge port 16 by a transport device (not shown) and collected in a chip bucket. The coolant is filtered by entering the interior of the drum filter 42 from the exterior. The coolant purified by the drum filter 42 is discharged from the interior of the drum filter 42 into the second tank 21 described below.

[0041] The coolant processing device 10 further includes a first tank 31 and a second tank 21. The first tank 31 and the second tank 21 are each formed of a box capable of storing coolant.

[0042] The chip conveyor 11 is housed in the second tank 21. The chip conveyor 11 is disposed in a position overlapping with the second tank 21 in a top view. The first tank 31 is disposed separately from the chip conveyor 11. The first tank 31 is disposed in a position not overlapping with the chip conveyor 11 in a top view.

[0043] The second tank 21 has a bottom 22 and a side portion 23. The bottom portion 22 is disposed at the bottom of the second tank 21. The bottom portion 22 has, for example, a rectangular shape when viewed from above. The side portion 23 rises from the periphery of the bottom portion 22. A lower end portion of the side portion 23 is connected to the bottom portion 22. A storage space 20 capable of storing coolant is formed above the bottom portion 22 and surrounded by the side portion 23.

[0044] The second tank 21 has a tank height Ha. The tank height Ha corresponds to the maximum length of the side portion 23 in the up-down direction.

[0045] Fig. 3 is a side view showing the first tank in Fig. 1. Fig. 4 is a perspective view showing the first tank in Fig. 1.

[0046] 3 and 4, the first tank 31 has a bottom 32 and a side portion 33. The bottom portion 32 is disposed at the bottom of the first tank 31. As a representative example, the bottom portion 32 has a rectangular shape when viewed from above. The bottom portion 32 is disposed parallel to a horizontal plane. The side portion 33 rises from the periphery of the bottom portion 32. The lower end portion of the side portion 33 is connected to the bottom portion 32. A storage space 30 capable of storing coolant is formed above the bottom portion 32 and surrounded by the side portion 33.

[0047] The first tank 31 further has a top 34. The top 34 is disposed on the ceiling of the first tank 31. The top 34 faces the bottom 32 in the up-down direction. The top 34 is detachably attached to the upper end of the side portion 33. The top 34 constitutes a lid that closes the upper end opening of the side portion 33.

[0048] The first tank 31 has a tank height Hb. The tank height Hb corresponds to the maximum length of the side portion 33 in the up-down direction. The first tank 31 is taller than the second tank 21. The tank height Hb is greater than the tank height Ha (Hb>Ha).

[0049] 4, the maximum length Hb of the side portion 33 in the up-down direction is greater than the length Bmax of the straight line connecting the two most distant points on the periphery of the bottom portion 32 when viewed from above (Hb>Bmax). Bmax corresponds to the length between two diagonally arranged corners of the rectangular bottom portion 32.

[0050] The maximum length Hb of the side portion 33 in the up-down direction may be greater than 1.2 times the length Bmax of the line connecting the two most distant points on the periphery of the bottom portion 32 when viewed from above (Hb>1.2×Bmax). The maximum length Hb of the side portion 33 in the up-down direction may be less than 2 times the length Bmax of the line connecting the two most distant points on the periphery of the bottom portion 32 when viewed from above (Hb≦2×Bmax), or less than 1.5 times (Hb≦1.5×Bmax).

[0051] The bottom 32 may be disposed at an angle to the horizontal plane. In such a configuration, when the heights of the upper ends of the side portions 33 are uniform, the maximum length Hb of the side portions 33 in the up-down direction is the vertical length of the side portions 33 rising from the periphery of the bottom 32 at the lowest position of the bottom 32.

[0052] The shape of the bottom 32 in the top view is not limited to a rectangular shape, and may be, for example, a polygonal shape other than a rectangle, a circle, or an L-shape. The straight line connecting the two most distant points on the periphery of the bottom 32 for determining the length Bmax may pass through a position that is not projected onto the bottom 32 in the up-down direction between the two most distant points on the periphery of the bottom 32.

[0053] The area of ​​the bottom 32 of the first tank 31 is smaller than the area of ​​the bottom 22 of the second tank 21. The capacity of the coolant in the first tank 31 is larger than the capacity of the coolant in the second tank 21. The capacity of the coolant in the first tank 31 may be equal to or smaller than the capacity of the coolant in the second tank 21.

[0054] The coolant processing device 10 further includes a first flow path 51 , a second pump 62 , and a filter 41 .

[0055] The first flow path 51 is a passage through which the coolant flows, and is made of piping members such as steel pipes or hoses. The first flow path 51 is connected to the first tank 31. The first flow path 51 extends between the first tank 31 and a branch portion 56 described later. The second pump 62 and the filter 41 are provided on the path of the first flow path 51. The second pump 62 is provided upstream of the filter 41 in the coolant flow in the first flow path 51.

[0056] The first flow path 51 includes a first pipe 71. The first pipe 71 is connected to the first tank 31. The first pipe 71 is connected to the bottom 32. A connection portion 71p of the first pipe 71 to the bottom 32 opens into the storage space 30 at the bottom 32. The connection portion 71p of the first pipe 71 forms a circular opening at the bottom 32. The first pipe 71 connects between the first tank 31 and the second pump 62. The first pipe 71 discharges the coolant from inside the first tank 31 (storage space 30).

[0057] The first tank 31 is configured to form a space 37 below the bottom 32. More specifically, the first tank 31 further includes a base plate 36 and a plurality of pillars 35. The base plate 36 is placed on the floor of a factory or the like in which the coolant treatment device 10 is installed. The pillars 35 extend in the vertical direction. An upper end of the pillar 35 is connected to the bottom 32, and a lower end of the pillar 35 is connected to the base plate 36. The plurality of pillars 35 are disposed at intervals from one another. The space 37 is formed between the bottom 32 and the base plate 36.

[0058] The second pump 62 is disposed in the space 37. The second pump 62 has a motor 72, a shaft 76, an impeller 73, a coolant inlet portion 74, and a coolant outlet portion 75.

[0059] The motor 72 is provided as a power source for the second pump 62. When power is supplied to the motor 72, the motor 72 outputs a rotational motion about a virtual central axis 102. The impeller 73 is provided away from the motor 72 in the axial direction of the central axis 102. The shaft 76 extends on the axis of the central axis 102, and is connected to the motor 72 and the impeller 73 at both ends. The shaft 76 transmits the rotational motion output from the motor 72 to the impeller 73. The impeller 73 receives the rotational motion transmitted from the shaft 76 and rotates about the central axis 102.

[0060] Coolant inlet port 74 opens at an end of second pump 62 in the axial direction of central axis 102. First piping 71 is connected to coolant inlet port 74. Coolant outlet port 75 opens at a position radially outwardly spaced from central axis 102. A piping that forms first flow path 51 and extends toward filter 41 is connected to coolant outlet port 75.

[0061] The second pump 62 is disposed in the space 37 with the shaft 76 (central axis 102) extending horizontally.

[0062] The filter 41 can remove foreign matter such as sludge or chips contained in the coolant flowing through the first flow path 51. As an example, the filter 41 is a cyclone-type filtering device that separates the coolant from foreign matter such as sludge or chips contained in the coolant by centrifugal force. The filter 41 may be provided in a form supported by the first tank 31.

[0063] As the second pump 62 is driven, a flow of coolant is formed in the first flow path 51. The coolant flowing through the first flow path 51 passes through the filter 41, whereby foreign matter such as sludge or chips contained in the coolant is removed. As a result, clean coolant is supplied through the first flow path 51.

[0064] The coolant processing device 10 further includes a second flow path 52 , a coolant discharge device 46 , and a first pump 61 .

[0065] The second flow path 52 branches off from the first flow path 51. The coolant from the first flow path 51 flows through the second flow path 52. The second flow path 52 is a passage through which the coolant flows, and is made of piping members such as steel pipes or hoses. At a branching portion 56, the second flow path 52 is connected to the first flow path 51 and a third flow path 53 (described later) via various piping joints. The second flow path 52 extends between the branching portion 56 and the coolant discharge device 46.

[0066] The coolant discharge device 46 discharges coolant toward the machining point of the workpiece. The coolant discharge device 46 is a spindle-through type coolant discharge device that is provided on the tool spindle and discharges coolant from the cutting edge of the tool T held by the tool spindle.

[0067] The first pump 61 is provided on the path of the second flow passage 52. The first pump 61 pumps out the coolant toward the coolant discharge device .

[0068] The coolant treatment device 10 further includes a third flow path 53 , a nozzle unit 47 , a fourth flow path 54 , and a flow rate adjustment unit 66 .

[0069] The third flow path 53 branches off from the first flow path 51. The coolant from the first flow path 51 flows through the third flow path 53. The third flow path 53 is a passage through which the coolant flows, and is made of a piping member such as a steel pipe or a hose. The third flow path 53 extends between the branch portion 56 and the nozzle portion 47.

[0070] Nozzle unit 47 is disposed inside drum filter 42 having a cylindrical shape. Nozzle unit 47 discharges coolant supplied from third flow path 53. Nozzle unit 47 discharges coolant toward drum filter 42 rotating about central axis 101, and removes foreign matter such as sludge or chips from drum filter 42.

[0071] The fourth flow path 54 branches off from the third flow path 53. The fourth flow path 54 guides the coolant from the third flow path 53 to the second tank 21. The fourth flow path 54 is a passage through which the coolant flows, and is composed of piping members such as steel pipes or hoses. The fourth flow path 54 is connected to the third flow path 53 at a branching portion 57 via various piping joints. The fourth flow path 54 extends between the branching portion 57 and the second tank 21.

[0072] The flow rate adjustment portion 66 is provided on the path of the fourth flow passage 54. The flow rate adjustment portion 66 provides resistance to the coolant flow in the fourth flow passage 54.

[0073] The flow rate adjustment unit 66 is composed of a check valve that allows the coolant to flow from the branching portion 57 toward the second tank 21 while providing resistance to the coolant flow in the fourth flow path 54, and also regulates the coolant flow from the second tank 21 toward the branching portion 57. The flow rate adjustment unit 66 is not limited to the above check valve, and may be composed of, for example, an orifice whose pipe is narrowed so as to have a relatively large flow path area on the branching portion 57 side and a relatively small flow path area on the second tank 21 side.

[0074] The coolant processing device 10 further includes a fifth flow path 55 and a third pump 63. The fifth flow path 55 extends between the second tank 21 and the first tank 31. The fifth flow path 55 is a passage through which the coolant flows, and is formed of a piping member such as a steel pipe or a hose.

[0075] The third pump 63 is provided on the path of the fifth flow path 55. The third pump 63 sends out the coolant from the second tank 21 toward the first tank 31 through the fifth flow path 55. The third pump 63 is installed in the second tank 21. The third pump 63 is a pumping pump that pumps up the coolant stored in the second tank 21 and sends it out toward the first tank 31. The third pump 63 is provided at the end of the fifth flow path 55 on the second tank 21 side.

[0076] In this configuration, the second tank 21, the fifth flow path 55, the first tank 31, the first flow path 51, the third flow path 53, and the fourth flow path 54 are connected in a circular manner in the listed order to form a coolant circulation path. The coolant circulates through this circulation path by operating the third pump 63 and the second pump 62. During this time, the coolant passes through the filter 41, so that the coolant stored in the second tank 21 and the first tank 31 can be purified.

[0077] Next, a detailed description will be given of the structure of the first tank 31 in Fig. 1. Fig. 5 is a cross-sectional view showing the first tank as seen in the direction of the arrow on the two-dot chain line VV in Fig. 3.

[0078] 3 and 5, the first tank 31 further has a guide portion 38. The guide portion 38 is disposed in the storage space 30 in the first tank 31. The guide portion 38 is provided on the bottom portion 32. The guide portion 38 extends along the periphery of the bottom portion 32 when viewed from above. The guide portion 38 guides a swirling flow of coolant, which will be described later, along the periphery of the bottom portion 32.

[0079] The guide portion 38 is made of a plate material that is erected on the bottom portion 32. When viewed from above, the guide portion 38 extends while curving. When viewed from above, the guide portion 38 has a curved shape that is convex from the center toward the periphery of the bottom portion 32. When viewed from above, the guide portion 38 is provided at the four corners of the bottom portion 32 that has a rectangular shape. The guide portion 38 is divided between the corners of the bottom portion 32 that are adjacent to each other.

[0080] The bottom 32 is defined with a peripheral region 210 and a central region 220. The peripheral region 210 goes around the peripheral edge of the bottom 32. The peripheral region 210 extends annularly in the circumferential direction of the peripheral edge of the bottom 32. The circumferential direction of the peripheral region 210 corresponds to the circumferential direction of the peripheral edge of the bottom 32. The central region 220 is disposed inside the peripheral region 210. The first piping 71 (connection portion 71p) opens into the central region 220.

[0081] 5 shows a boundary line 200 that defines the boundary between the peripheral region 210 and the central region 220. The peripheral region 210 is defined between the side portion 33 and the guide portion 38 and the boundary line 200. The peripheral region 210 extends in an annular shape while maintaining a constant length (width) between the side portion 33 and the guide portion 38 and the boundary line 200. The central region 220 is defined in an area surrounded by the boundary line 200. The first pipe 71 (connection portion 71p) opens at the center position of the central region 220. The first pipe 71 (connection portion 71p) may open at a position shifted from the center position of the central region 220.

[0082] The coolant processing device 10 further includes a first coolant discharge part 160 and a second coolant discharge part 170 .

[0083] The first coolant discharge portion 160 and the second coolant discharge portion 170 are disposed in the storage space 30 in the first tank 31. Each of the first coolant discharge portion 160 and the second coolant discharge portion 170 is formed of a piping member capable of discharging coolant.

[0084] The first coolant discharge portion 160 is provided at a position spaced upward from the bottom portion 32. The first coolant discharge portion 160 is disposed above the peripheral region 210. The first coolant discharge portion 160 is provided at a position projected onto the peripheral region 210 in the up-down direction. The first coolant discharge portion 160 discharges coolant so as to generate a swirling flow of coolant on the peripheral region 210.

[0085] The second coolant discharge portion 170 is provided at a position spaced upward from the bottom portion 32. The second coolant discharge portion 170 is disposed above the peripheral region 210. The second coolant discharge portion 170 is provided at a position projected onto the peripheral region 210 in the up-down direction. The second coolant discharge portion 170 discharges the coolant so as to generate a swirling flow of coolant on the peripheral region 210.

[0086] The first coolant discharge portion 160 and the second coolant discharge portion 170 discharge the coolant in the same direction along the circumferential direction of the peripheral region 210 (clockwise direction when viewed from above in FIG. 5).

[0087] By the discharge of coolant from the first coolant discharge portion 160 and the second coolant discharge portion 170, a swirling flow is formed on the peripheral region 210 in which the coolant swirls in one direction along the circumferential direction of the peripheral region 210 (clockwise when viewed from above in Figure 5).

[0088] The second coolant discharge portion 170 is provided at a position facing the first coolant discharge portion 160 across the central region 220 in top view. The central region 220 is located between the first coolant discharge port 161 and the second coolant discharge port 171 in top view. The second coolant discharge portion 170 is provided at a position away from the first coolant discharge portion 160 in the circumferential direction of the peripheral region 210.

[0089] Each of the first coolant discharge portion 160 and the second coolant discharge portion 170 is provided at a position facing the guide portion 38 in the horizontal direction. Each of the first coolant discharge portion 160 and the second coolant discharge portion 170 may be provided at a position facing the side portion 33 in the horizontal direction.

[0090] The first coolant discharge portion 160 and the second coolant discharge portion 170 respectively have a first coolant discharge port 161 and a second coolant discharge port 171. Each of the first coolant discharge port 161 and the second coolant discharge port 171 is an opening portion capable of discharging coolant.

[0091] The first coolant outlet 161 and the second coolant outlet 171 each open in the circumferential direction of the peripheral region 210. The first coolant outlet 161 and the second coolant outlet 171 each open in the same direction along the circumferential direction of the peripheral region 210 (clockwise direction when viewed from above in FIG. 5).

[0092] The first coolant outlet 161 and the second coolant outlet 171 are open at the same height. Each of the first coolant outlet 161 and the second coolant outlet 171 is open at a position closer to the lower end 33t of the side portion 33 than to the upper end 33s of the side portion 33 in the up-down direction.

[0093] Fig. 6 is a perspective view showing the first coolant discharge portion and the third coolant discharge portion, and Fig. 7 is a cross-sectional view showing the first coolant discharge portion and the third coolant discharge portion as viewed in the direction of the arrows on the line VII-VII in Fig. 6.

[0094] 3, 5, 6 and 7, the coolant processing device 10 further includes a third coolant discharge portion 180. As shown in FIG.

[0095] The third coolant discharge part 180 is disposed in the storage space 30 in the first tank 31. The third coolant discharge part 180 is made up of a piping member capable of discharging the coolant.

[0096] The third coolant discharge portion 180 is provided at a position spaced upward from the bottom portion 32. The third coolant discharge portion 180 is disposed above the peripheral region 210. The third coolant discharge portion 180 is provided at a position projected onto the peripheral region 210 in the up-down direction.

[0097] The third coolant discharge portion 180 discharges the coolant from the peripheral region 210 toward the central region 220 in a direction that avoids the opening of the first pipe 71 (connection portion 71p) in the central region 220 in a top view.

[0098] 5 shows a projection area 280 in which a third coolant discharge port 181, which will be described later, is projected in the direction in which the coolant is discharged from the third coolant discharge portion 180. The projection area 280 first passes through a position projected onto the peripheral area 210 in the vertical direction, and then passes through a position projected onto the central area 220 in the vertical direction. The projection area 280 passes through a position not projected onto the opening of the first piping 71 (connection portion 71p) in the vertical direction.

[0099] 5, in the peripheral region 210, an upstream region 210j in which the swirling flow of the coolant flows toward the third coolant discharge portion 180 and a downstream region 210k in which the swirling flow of the coolant flows away from the third coolant discharge portion 180 are defined, with the third coolant discharge portion 180 as a boundary. In the upstream region 210j, the coolant flows from the second coolant discharge portion 170 toward the first coolant discharge portion 160. In the downstream region 210k, the coolant flows from the first coolant discharge portion 160 toward the second coolant discharge portion 170.

[0100] In top view, a straight line 230 is assumed to connect the third coolant discharge part 180 and the opening of the first pipe 71 (connection part 71p) in the central region 220. In this case, the third coolant discharge part 180 discharges coolant in a direction toward the central region 220 in a range sandwiched between the straight line 230 and the downstream region 210k. The projection region 280 passes through a position projected onto the central region 220 in a range sandwiched between the straight line 230 and the downstream region 210k in the up-down direction.

[0101] The third coolant discharge portion 180 has a third coolant discharge port 181. The third coolant discharge port 181 is an opening portion capable of discharging coolant. The third coolant discharge port 181 opens toward the central region 220. The third coolant discharge port 181 opens toward the central region 220 in the range sandwiched between the straight line 230 and the downstream region 210k.

[0102] With this configuration, coolant is discharged from the first coolant discharge port 160 and the second coolant discharge port 170, generating a swirling flow of coolant on the peripheral region 210 of the bottom 32, thereby moving foreign matter such as sludge or chips from the peripheral region 210 to the central region 220 inside.

[0103] In this case, if the coolant discharge for generating the swirling flow of the coolant is performed by a single coolant discharge part, it is necessary to set the amount of coolant discharged from the coolant discharge part to be large. As a result, a vertical swirling flow is added to the coolant flow in the storage space 30, and there is a concern that foreign matter such as sludge or chips accumulated on the bottom 32 may be dispersed into the storage space 30. In this embodiment, the coolant discharge for generating the swirling flow of the coolant is performed by the first coolant discharge part 160 and the second coolant discharge part 170, so that such a concern can be eliminated.

[0104] Since the force of the swirling flow of the coolant is weak in the central region 220, a phenomenon may occur in which foreign matter such as sludge or chips remains in the central region 220 around the opening of the first pipe 71. In response to this, by discharging the coolant from the third coolant discharge part 180 in a direction from the peripheral region 210 toward the central region 220 in a top view, the foreign matter such as sludge or chips in the central region 220 is disturbed, and the foreign matter can be collected at the opening of the first pipe 71. In addition, since the coolant is discharged from the third coolant discharge part 180 in a direction that avoids the opening of the first pipe 71 in the central region 220, the foreign matter that has collected at the opening of the first pipe 71 can be prevented from being dispersed again.

[0105] Therefore, by discharging coolant from the first coolant discharge portion 160, the second coolant discharge portion 170 and the third coolant discharge portion 180, foreign matter such as sludge or chips can be efficiently discharged from the first tank 31 through the first piping 71.

[0106] In addition, a filter 41 is provided on the first flow path 51 through which the coolant discharged from the first tank 31 flows. This allows the filter 41 to collect foreign matter such as sludge or chips discharged from the first tank 31 through the first piping 71. In addition, the third coolant discharge portion 180 is provided at a position above and away from the bottom 32. This makes it possible to prevent the swirling flow of coolant formed on the peripheral region 210 of the bottom 32 from being blocked by the third coolant discharge portion 180.

[0107] 6 and 7, the third coolant discharge portion 180 discharges the coolant in an obliquely downward direction. The third coolant discharge port 181 opens in an obliquely downward direction. With this configuration, the coolant is discharged from the third coolant discharge portion 180 toward the bottom 32, so that foreign matter such as sludge or chips accumulated in the central region 220 of the bottom 32 can cause large disturbances.

[0108] 3, the third coolant outlet 181 opens at a position closer to the lower end 33t of the side portion 33 than to the upper end 33s of the side portion 33 in the up-down direction. A length Hb1 between the third coolant outlet 181 and the lower end 33t of the side portion 33 in the up-down direction is smaller than a length Hb2 between the upper end 33s of the side portion 33 and the third coolant outlet 181 in the up-down direction (Hb1 <Hb2)。

[0109] With this configuration, the third coolant outlet 181 opens at a position closer to the bottom 32, so that the discharge of coolant from the third coolant outlet 181 can cause greater disturbance due to foreign matter such as sludge or chips that accumulate in the central region 220 of the bottom 32.

[0110] 6 and 7, the third coolant discharge port 181 opens in a flat shape such that the opening length Da in the horizontal direction is greater than the opening length Db in the vertical direction (Da>Db). The third coolant discharge port 181 forms an opening in the shape of a horizontally long oval.

[0111] With this configuration, the coolant discharged from the third coolant discharge port 180 can flow more evenly along the surface of the bottom 32, thereby causing greater disturbance due to foreign matter such as sludge or chips that accumulate in the central region 220 of the bottom 32.

[0112] The coolant processing device 10 has a piping member 191. The third coolant discharge part 180 is provided integrally with the first coolant discharge part 160 in the piping member 191.

[0113] The piping member 191 has a first coolant discharge portion 160, a third coolant discharge portion 180, and a connection portion 192. The connection portion 192 is made of a bottomed cylinder that opens upward. A threaded portion is provided on the inner peripheral surface of the connection portion 192 for connecting the second piping 150 described below. The first coolant discharge portion 160 is made of a cylinder that communicates with the connection portion 192 and protrudes radially outward from the outer peripheral surface of the connection portion 192. The first coolant discharge port 161 opens at the tip of the first coolant discharge portion 160 that protrudes from the outer peripheral surface of the connection portion 192.

[0114] The third coolant discharge part 180 is formed of a cylinder that communicates with the connection part 192 and protrudes radially outward from the outer circumferential surface of the connection part 192. The third coolant discharge part 180 is provided at a position circumferentially away from the first coolant discharge part 160 on the outer circumferential surface of the connection part 192. The third coolant discharge port 181 opens at the tip of the third coolant discharge part 180 that protrudes from the outer circumferential surface of the connection part 192. The opening area of ​​the third coolant discharge port 181 is smaller than the opening area of ​​the first coolant discharge port 161. The opening area of ​​the third coolant discharge port 181 may be equal to or larger than the opening area of ​​the first coolant discharge port 161.

[0115] 3 and 5, the coolant processing device 10 further includes a second pipe 150 and a third pipe 140. A coolant is supplied to the second pipe 150 and the third pipe 140. The first coolant discharge part 160 and the third coolant discharge part 180 are connected to the second pipe 150. The second coolant discharge part 170 is connected to the third pipe 140.

[0116] The second pipe 150 and the third pipe 140 are each supplied with coolant from the second tank 21 through a fifth flow path 55. The second pipe 150 and the third pipe 140 extend in the vertical direction and enter the storage space 30 in the first tank 31. The first coolant discharge portion 160 and the third coolant discharge portion 180 (connection portion 192 of the pipe member 191) are connected to the lower end of the second pipe 150. The second coolant discharge portion 170 is connected to the lower end of the third pipe 140.

[0117] According to such a configuration, the coolant is supplied collectively to the first coolant discharge portion and the third coolant discharge portion through the second piping 150, so that the coolant processing device 10 can be configured simply.

[0118] The third coolant discharge portion 180 may be provided separately from the first coolant discharge portion 160.

[0119] The third pump 63 in FIG. 1 pumps the coolant stored in the second tank 21 through the fifth flow path 55 and the second piping 150 toward the first coolant discharge port 160 and the third coolant discharge port 180, and pumps the coolant through the fifth flow path 55 and the third piping 140 toward the second coolant discharge port 170.

[0120] With this configuration, the third pump 63 for returning coolant from the second tank 21, which stores the coolant discharged from the machine tool body 110, to the first tank 31 is used to supply coolant to the first coolant discharge portion 160, the second coolant discharge portion 170 and the third coolant discharge portion 180, thereby enabling efficient discharge of foreign matter such as sludge or chips.

[0121] 8 is a cross-sectional view showing a modification of the coolant processing device in FIG. 5. Referring to FIG. 8, in this modification, the third coolant discharge part 180 discharges the coolant in a direction toward the central region 220 in the range between the straight line 230 and the upstream region 210j. The projection region 280 passes through a position projected onto the central region 220 in the range between the straight line 230 and the upstream region 210j in the up-down direction. As shown in this modification, the discharge direction of the coolant from the third coolant discharge part 180 may be a direction opposite to the swirling flow of the coolant formed on the central region 220 of the bottom 32.

[0122] To summarize the structure of the coolant processing device 10 in the embodiment of the present invention described above, the coolant processing device 10 in the present embodiment has a bottom 32 and a side portion 33 rising from the periphery of the bottom 32, and is equipped with a first tank 31 capable of storing coolant above the bottom 32 at a position surrounded by the side portion 33, and a first piping 71 connected to the bottom 32 and discharging coolant from inside the first tank 31. The bottom 32 is defined by a peripheral region 210 that runs around the periphery of the bottom 32, and a central region 220 that is disposed inside the peripheral region 210 and into which the first piping 71 opens. The coolant treatment device 10 further includes a first coolant discharge section 160 that is arranged above the peripheral region 210 and discharges coolant so as to generate a swirling flow of coolant on the peripheral region 210, a second coolant discharge section 170 that is arranged above the peripheral region 210 and located opposite the first coolant discharge section 160 across the central region 220 in a top view and discharges coolant so as to generate a swirling flow of coolant on the peripheral region 210, and a third coolant discharge section 180 that is arranged above the peripheral region 210 and discharges coolant in a direction from the peripheral region 210 toward the central region 220 in a top view and in a direction that avoids the opening of the first piping 71 in the central region 220.

[0123] According to the coolant treatment device 10 thus configured in the embodiment of the present invention, foreign matter such as sludge or chips contained in the coolant can be efficiently discharged from the first tank 31.

[0124] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Industrial Applicability]

[0125] The present invention is applicable to, for example, a coolant treatment device used in a machine tool. [Explanation of symbols]

[0126] 10 coolant processing device, 11 chip conveyor, 13 chip receiving port, 16 chip discharge port, 19 cover body, 20, 30 storage space, 21 second tank, 22, 32 bottom, 23, 33 side, 31 first tank, 33s upper end, 33t lower end, 34 top, 35 column, 36 base plate, 37 space, 38 guide, 41 filter, 42 drum filter, 46 coolant discharge device, 47 nozzle, 51 first flow path, 52 second flow path, 53 third flow path, 54 fourth flow path, 55 fifth flow path, 56, 57 branching portion, 61 first pump, 62 second pump, 63 third pump, 66 flow rate adjustment portion, 71 first piping, 71p, 192 connection portion, 72 motor, 73 impeller, 74 coolant inlet portion, 75 Coolant outlet section, 76 shaft, 100 machine tool, 101, 102 central axis, 110 machine tool body, 120 machining area, 140 third piping, 150 second piping, 160 first coolant outlet section, 161 first coolant outlet port, 170 second coolant outlet section, 171 second coolant outlet port, 180 third coolant outlet section, 181 third coolant outlet port, 191 piping component, 200 boundary line, 210 peripheral region, 210j upstream region, 210k downstream region, 220 central region, 230 straight line, 280 projection region.

Claims

1. a first tank having a bottom and a side portion rising from a peripheral edge of the bottom, the first tank being capable of storing a coolant at a position above the bottom and surrounded by the side portion; a first pipe connected to the bottom and configured to discharge the coolant from within the first tank; The bottom portion is provided with a peripheral region that runs around the periphery of the bottom portion, and a central region that is disposed inside the peripheral region and into which the first pipe opens. a first coolant discharge portion disposed above the peripheral region and configured to discharge coolant so as to generate a swirling flow of coolant on the peripheral region; a second coolant discharge portion that is disposed above the peripheral region and opposed to the first coolant discharge portion across the central region in a top view, and that discharges coolant so as to generate a swirling flow of coolant on the peripheral region; a third coolant discharge portion that is disposed above the peripheral region and discharges coolant from the peripheral region toward the central region in a top view and in a direction that avoids an opening of the first pipe in the central region; The first coolant discharge portion and the second coolant discharge portion discharge the coolant along the side portion when viewed from above.

2. the third coolant discharge portion has a coolant discharge port for discharging the coolant, The coolant processing device according to claim 1 , wherein the coolant discharge port is open at a position closer to a lower end of the side portion than to an upper end of the side portion in the up-down direction.

3. The coolant processing device according to claim 1 , wherein the third coolant discharge portion is provided at a position spaced above the bottom portion.

4. The coolant processing device according to claim 1 , wherein the third coolant discharge portion discharges the coolant in an obliquely downward direction.

5. The coolant treatment device according to claim 1 , wherein the third coolant discharge portion has a flat opening such that an opening length in a horizontal direction is greater than an opening length in a vertical direction, and has a coolant discharge port from which the coolant is discharged.

6. In the peripheral region, an upstream region in which the swirling flow of the coolant flows in a direction approaching the third coolant discharge portion and a downstream region in which the swirling flow of the coolant flows in a direction away from the third coolant discharge portion are defined with the third coolant discharge portion as a boundary, A coolant treatment device as described in any one of claims 1 to 5, wherein, when viewed from above, when a straight line is assumed connecting the third coolant discharge portion and the opening of the first piping in the central region, the third coolant discharge portion discharges coolant in a direction toward the central region in a range sandwiched between the straight line and the downstream region.

7. In the peripheral region, an upstream region in which the swirling flow of the coolant flows in a direction approaching the third coolant discharge portion and a downstream region in which the swirling flow of the coolant flows in a direction away from the third coolant discharge portion are defined with the third coolant discharge portion as a boundary, A coolant treatment device as described in any one of claims 1 to 5, wherein, when viewed from above, when a straight line is assumed connecting the third coolant discharge portion and the opening of the first piping in the central region, the third coolant discharge portion discharges coolant in a direction toward the central region in a range sandwiched between the straight line and the upstream region.

8. The cooling system further includes a second pipe and a third pipe to which a coolant is supplied, the first coolant discharge portion and the third coolant discharge portion are connected to the second pipe, The coolant processing device according to claim 1 , wherein the second coolant discharge portion is connected to the third pipe.

9. The coolant treatment device according to claim 1 , further comprising a filter provided on a flow path of the coolant discharged from the first tank through the first piping.

10. A second tank for storing coolant discharged from the machine tool body; The coolant treatment device according to claim 1 , further comprising a pump that pressure-feeds the coolant stored in the second tank toward the first coolant discharge portion, the second coolant discharge portion, and the third coolant discharge portion.

11. A first tank having a bottom and a side portion rising from a periphery of the bottom, the first tank being above the bottom and capable of storing coolant at a position surrounded by the side portions; a first pipe connected to the bottom and configured to discharge the coolant from within the first tank; The bottom portion is provided with a peripheral region that runs around the periphery of the bottom portion, and a central region that is disposed inside the peripheral region and into which the first pipe opens. a first coolant discharge portion disposed above the peripheral region and configured to discharge coolant so as to generate a swirling flow of coolant on the peripheral region; a second coolant discharge portion that is disposed above the peripheral region and opposed to the first coolant discharge portion across the central region in a top view, and that discharges coolant so as to generate a swirling flow of coolant on the peripheral region; a third coolant discharge portion that is disposed above the peripheral region and discharges coolant from the peripheral region toward the central region in a top view and in a direction that avoids an opening of the first pipe in the central region; the third coolant discharge portion has a coolant discharge port that opens flat so that its opening length in the horizontal direction is greater than its opening length in the vertical direction and discharges the coolant.

12. A first tank having a bottom and a side portion rising from a periphery of the bottom, the first tank being above the bottom and capable of storing coolant at a position surrounded by the side portions; a first pipe connected to the bottom and configured to discharge the coolant from within the first tank; The bottom portion is provided with a peripheral region that runs around the periphery of the bottom portion, and a central region that is disposed inside the peripheral region and into which the first pipe opens. a first coolant discharge portion disposed above the peripheral region and configured to discharge coolant so as to generate a swirling flow of coolant on the peripheral region; a second coolant discharge portion that is disposed above the peripheral region and opposed to the first coolant discharge portion across the central region in a top view, and that discharges coolant so as to generate a swirling flow of coolant on the peripheral region; a third coolant discharge portion that is disposed above the peripheral region and discharges coolant from the peripheral region toward the central region in a top view and in a direction that avoids an opening of the first pipe in the central region; In the peripheral region, an upstream region in which the swirling flow of the coolant flows in a direction approaching the third coolant discharge portion and a downstream region in which the swirling flow of the coolant flows in a direction away from the third coolant discharge portion are defined with the third coolant discharge portion as a boundary, A coolant treatment device in which, when viewed from above, when a straight line is assumed to connect the third coolant discharge portion and the opening of the first piping in the central region, the third coolant discharge portion discharges coolant in a direction toward the central region in the range sandwiched between the straight line and the upstream region.

13. A machine tool equipped with a coolant treatment device described in any one of claims 1 to 12.

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