JPWO2016132449A1 - Coolant processing equipment - Google Patents

Abstract

A coolant processing apparatus comprising: a substantially rectangular tank for storing a coolant; an inlet for allowing the coolant to flow into the tank; and a plurality of pumps for sucking out the coolant in the tank. The rectifying member that rectifies the flow of the coolant along the outer peripheral wall is provided at the intersecting corner portion, and the suction ports of the plurality of pumps are provided near the center portion, and the suctioned by the plurality of pumps. A discharge port for discharging a part of the coolant is provided in the vicinity of the outer peripheral wall of the tank.

Description

  The present invention relates to an apparatus for processing coolant installed in a machine tool, and more particularly, to a coolant processing apparatus for removing impurities such as chips from coolant discharged from a chip collection apparatus.

Conventionally, in a machine tool such as a machining center, coolant such as cutting water and cutting oil generated during cutting processing includes impurities such as chips and sludge generated by the cutting processing, and the impurities are removed from the coolant. For this reason, a cutting water treatment apparatus having a filtration tank composed of a plurality of tanks partitioned by a partition plate is known (see Patent Document 1).
In such a cutting water treatment apparatus, when the coolant passes through the plurality of tanks, impurities are reliably removed from the coolant by alternately passing through the vicinity of the bottom of the partition plate and the vicinity of the water surface.

Since the cutting water treatment apparatus disclosed in Patent Document 1 has a structure that precipitates impurities when the coolant passes through a plurality of tanks, it is necessary to periodically clean the precipitated impurities. In addition, there is a problem that a coolant retention portion is easily formed near the bottom of the partition plate forming the plurality of tanks, and workability when cleaning this portion is poor.
In order to solve these points, the coolant recovered from the processing machine is processed with a separator to remove chips and the like, and then a coolant rotating flow is formed in the storage tank, and the fine precipitates in the storage tank are precipitated. Chips and the like are again sucked into the separator to be removed, and then the purifier (see Patent Document 2) for returning from the supply device to the processing machine or the dirty coolant recovered from the processing machine is passed through the settling separator. There has been proposed a fine sludge removal device (see Patent Document 3) that performs treatment with a magnetic separator to roughen sludge such as chips, and then precipitates fine sludge in a separation tank for further separation and removal.

JP 2006-088240 A Japanese Patent Application Laid-Open No. 07-246542 Registered Utility Model No. 3055421

The purification device described in Patent Document 2 or the fine sludge removal device described in Patent Document 3 each have a tank that circulates coolant, and precipitates and separates fine chips and the like in the tank. It has been removed.
However, in these apparatuses, the impurities contained in the coolant recovered from the processing machine and the coolant circulating in the tank are separated from the separation means (separator or precipitation separator and magnetic separator) provided separately from the tank. In order to remove impurities in the coolant, it is necessary to additionally provide the above separating means that requires another power, which causes an increase in the cost of the entire apparatus. At the same time, a space for disposing the separating means in addition to the tank is further required, and there is a problem that the entire apparatus becomes large.
Further, in the purification device described in Patent Document 2, the coolant is stagnated in the four corners of the intersecting corners of the outer peripheral wall of the storage tank, and in the fine sludge removal device described in Patent Document 3, the settling separator separates the coolant. There was a problem that the coolant was easily corroded.

Accordingly, an object of the present invention is to provide a coolant processing apparatus capable of separating and removing impurities in the coolant with a simple configuration without using a separator or magnetic separation means.
A further object of the present invention is to provide a coolant processing apparatus free from coolant stagnation.

  In order to achieve the above object, a coolant processing apparatus of the present invention includes a substantially rectangular tank for storing coolant, an inlet for allowing the coolant to flow into the tank, and a plurality of pumps for sucking out the coolant in the tank. The tank includes a rectifying member that rectifies the flow of the coolant along the outer peripheral wall at a corner portion where the outer peripheral wall intersects, and includes suction ports of the plurality of pumps in the vicinity of the center portion, A discharge port for discharging a part of the coolant sucked out by the plurality of pumps is provided in the vicinity of the outer peripheral wall of the tank.

In one aspect of the coolant processing apparatus of the present invention, the discharge port is disposed so as to discharge the coolant in a horizontal direction along the outer peripheral wall of the tank.
In addition, at least two discharge ports are arranged in the same direction as the coolant flow along the outer peripheral wall.
Furthermore, at least one of the discharge ports is disposed upstream of the coolant flow at the inlet.

In another aspect of the coolant processing apparatus of the present invention, a first filter is provided at the outlet of the inlet to the tank.
Moreover, the 2nd filter is provided in the at least 1 discharge piping of these pumps.

In still another aspect of the coolant processing apparatus of the present invention, a top plate to which the plurality of pumps are attached is provided near the center of the tank, and a plurality of support columns are formed at a lower portion of the top plate. . At this time, the plurality of support columns are formed with rectifying surfaces that rectify the flow of the coolant on the outer peripheral wall side and the center side of the tank.
In addition, at least one of the discharge ports is disposed between any one of the plurality of support columns and the outer peripheral wall of the tank.

  In still another aspect of the coolant processing apparatus of the present invention, the bottom surface of the tank is a horizontal surface, the inner surface thereof is smooth, and a plurality of reinforcing ribs are provided on the outer surface side.

By providing the above-described means, the coolant processing apparatus of the present invention can provide a coolant processing apparatus capable of separating and removing impurities in the coolant with a simple configuration without using a separator or a separation means such as magnetic separation. .
In addition, the coolant processing apparatus of the present invention employs a structure in which a vortex is generated in the tank along the outer peripheral wall of the tank, and the coolant containing impurities is pumped out from the center of the tank by the vortex. Maintenance can be improved without impurities remaining in the tank.
Furthermore, it is possible to provide a coolant processing apparatus free from coolant stagnation throughout the tank.
And since the coolant in the tank flows over almost the entire region, the occurrence of corrosion of the coolant can be greatly delayed, and the frequency of coolant replacement can be reduced.

It is a perspective view which shows the coolant processing apparatus by Example 1 of this invention. It is the perspective view seen from the back surface side which shows the structure of the bottom face part of the tank in the coolant processing apparatus by Example 1 of this invention. It is a perspective view which shows the coolant processing apparatus by Example 2 of this invention. It is a perspective view which shows the internal structure of the tank in the coolant processing apparatus by Example 2 of this invention. It is a perspective view of what deleted the beam member from the internal structure of the tank shown in FIG. It is a perspective view which shows arrangement | positioning relationship with the chip collection | recovery apparatus at the time of incorporating the coolant processing apparatus by Example 3 of this invention in a machine tool. It is a perspective view which shows the coolant processing apparatus by Example 3 of this invention.

<Example 1>
FIG. 1 is a perspective view showing a coolant processing apparatus according to a first embodiment of the present invention.
As shown in FIG. 1, the coolant processing apparatus 110 according to the first embodiment of the present invention is roughly divided into a substantially rectangular tank 120 that stores coolant circulated with a processing apparatus (not shown), and an inside of the tank 120. And an inlet 130 through which coolant flowing back from the processing apparatus flows in, and a pump group 140 having a plurality of pumps for sucking out the coolant in the tank 120.

The substantially rectangular tank 120 includes a bottom surface 121 having a substantially rectangular shape, an outer peripheral wall 122 disposed on the outer periphery of the bottom surface 121, and a rectifying member 123 provided at a corner where the outer peripheral wall 122 intersects. And.
Here, “substantially rectangular” includes not only a quadrangle whose corner is strictly perpendicular, but also a square or a quadrangle having a corner similar to a rectangle, and has four corners. If it is, the thing which formed the unevenness | corrugation in a part of four sides in the range which does not prevent formation of the eddy current of the coolant mentioned later is also included.
In addition, the corner portion of the “substantially rectangular” tank 120 forms not only a corner portion where the two outer peripheral walls 122 strictly intersect, but also the above-described rectifying member 123 and the outer peripheral wall 122 are integrally formed continuously. This configuration is also included.

The rectifying member 123 arranged at the corner of the substantially rectangular tank 120 is for smoothly turning the coolant flowing along the outer peripheral wall 122 inside the tank 120 at the corner of the tank 120 to form a vortex. It is a member for forming an inner wall surface, and for example, as shown in FIG. 1, a plurality of planes are continuously arranged to have a substantially curved shape.
Although FIG. 1 illustrates a structure in which a plurality of flat portions are continuously connected, the rectifying member 123 may be formed as one member made of one curved surface.
Moreover, in FIG. 1, although the structure which arrange | positions the four rectification members 123 inside the corner | angular part where the four outer peripheral walls 122 cross | intersect was illustrated, as above-mentioned, the outer peripheral wall 122 and the rectification members 123 are integrally formed, You may employ | adopt the shape which deleted the intersection part of the outer peripheral walls 122 in the said corner | angular part.

The substantially rectangular tank 120 is provided with an inflow port 130 through which coolant flowing back from a processing apparatus (not shown) flows.
In FIG. 1, the inflow port 130 is arranged in the vicinity of the outer peripheral wall 122 where the coolant flow is formed so as to merge with the vortex generated in the tank 120 described above. Moreover, although the case where two inflow ports 130 are provided is illustrated, one or more inflow ports 130 may be provided.

At the outlet of the inlet 130 to the tank 120, a first filter 131 that separates large impurities from the coolant that is directly refluxed from the processing apparatus is provided. At this time, as the first filter 131, for example, a filter capable of separating impurities having a size of 50 μm is used.
In addition, in order to process a large amount of coolant, it is desirable that the first filter has a cage shape in which filters are attached to the bottom surface and the side surface.
With such an arrangement, the coolant recirculated from the processing apparatus directly joins the flow in the tank 120, and no stagnation occurs in the recirculated coolant. Furthermore, since large chips are collected by the first filter 131, impurities such as chips and sludge mixed in the coolant can flow along the vortex without stagnation in the bottom surface portion 121 of the tank 120.

The coolant processing apparatus 110 according to the first embodiment of the present invention includes a pump group 140 including a plurality of pumps.
As shown in FIG. 1, the pump group 140 includes a vortex forming pump 141 used to form a vortex in the tank 120 and a discharge pump 142 that sucks out the coolant staying in the center of the tank 120 together with impurities. And a first chip flow pump 143 and a second chip flow pump 144 for sucking out coolant for flowing the chips accumulated in the processing apparatus.

In the pump group 140 shown in FIG. 1, suction pipes, which will be described later, are connected to individual pumps, and these connection pipes are arranged so that the suction port is located near the center of the tank 120.
With such an arrangement, the tank 120 of the coolant processing apparatus 110 according to the first exemplary embodiment of the present invention is supplied with coolant from the inlet 130, and the coolant is supplied to each tank 120 from each pump included in the plurality of pump groups 140. It has a function of storing coolant in a mode of being discharged to the outside.
FIG. 1 illustrates the case where two systems of the first chip flow pump 143 and the second chip flow pump 144 are provided as pumps for flowing the chips accumulated in the processing apparatus. Depending on the necessity of the area where the chips should flow, one or three or more chips may be disposed.

The vortex forming pump 141 is used to form a coolant flow (vortex) along the outer peripheral wall 122 of the tank 120 in the substantially rectangular tank 120 of the coolant processing apparatus 110 of the first embodiment. The suction pipe 141a and the discharge pipe 141b are connected.
As shown in FIG. 1, the discharge port 141 c of the discharge pipe 141 b is oriented so as to discharge the coolant in the horizontal direction along the inner side of the outer peripheral wall 122 of the tank 120.
With such an arrangement, the coolant discharged from the discharge port 141 c of the vortex forming pump 141 flows along the outer peripheral wall 122 of the tank 120, and then flows by the rectifying member 123 arranged at the corner of the tank 120. The flow direction is changed, and the flow flows along the next outer peripheral wall 122.
Then, the coolant flowing along the next outer peripheral wall 122 is changed in the flow direction by the next rectifying member 123 and further flows along the next outer peripheral wall 122. In this way, the coolant in the tank 120 forms a vortex along the outer peripheral wall 122.
Further, the suction ports are arranged so as to be located near the center of the tank 120.
With such an arrangement, a vortex flow of the coolant is formed toward the vicinity of the center of the tank 140 by the suction force of the individual pumps of the pump group 140.

By forming the vortex flow of the coolant as described above in the tank 120, impurities do not settle and accumulate on the bottom surface portion 121 of the tank 120 in the vicinity of the outer peripheral wall 122 where the coolant flows. Such impurities are concentrated in the vicinity of the central portion of the tank 120 due to the vortex.
As shown in FIG. 1, the discharge pump 142 is used for discharging the impurities staying in the vicinity of the center of the tank 120 together with the coolant, and the suction pipe 142a and the discharge pipe 142b are connected to each other. Has been.

Further, the discharge pipe 142 b of the discharge pump 142 is connected to a tool cooling pump 146 that discharges coolant for cooling the processing tool via the second filter 145 outside the tank 120. The tool cooling pump 146 is connected to a pipe for supplying coolant to a tool mounting portion of a processing apparatus (not shown).
At this time, as the second filter 145, a filter capable of separating impurities having a size of 10 μm, for example, is used.

With such a configuration, the impurities staying in the vicinity of the central portion of the tank 120 are discharged together with the coolant to the outside of the tank 120 by the discharge pump 142, so that no impurities remain in the tank 120.
Further, by attaching a second filter 145 capable of separating impurities smaller than the first filter to the discharge pipe 142b of the discharge pump 142, most of the impurities in the tank 120 can be recovered by the filter, The frequency of cleaning in the tank 120 can be reduced.

The first chip flow pump 143 is used, for example, to supply coolant for flowing chips in the vicinity of the workpiece of the processing apparatus, and the suction pipe 143a and the discharge pipe 143b are connected to each other.
Here, the discharge pipe 143b is branched into the return pipe 143d on the way, and the discharge port 143c of the return pipe 143d is in the horizontal direction along the inner side of the outer peripheral wall 122 of the tank 120, as shown in FIG. And it is orientated so that the coolant is discharged in the direction of forming the flow in the same direction as the coolant discharged from the discharge port 141c of the vortex forming pump 141.
In addition, it is preferable that at least one of the discharge ports is disposed upstream of the coolant flow at the inlet 130.
Similarly to the case of the discharge pump 142, a second filter is attached to the discharge pipe 143b of the first chip flow pump so as to separate and remove impurities contained in the coolant passing through the discharge pipe 143b. It can also be configured.

The second chip sink pump 144 is used, for example, for supplying coolant that flows chips from an auxiliary part (cover or the like) of the processing apparatus. The suction pipe 144a and the discharge pipe 144b are connected to each other. Yes.
Here, similarly to the case of the first chip flow pump 143, the discharge pipe 144 b branches into a return pipe on the way, and the discharge port of the return pipe is located inside the outer peripheral wall 122 of the tank 120. It is also possible to adopt a configuration in which the coolant is oriented so that the coolant is discharged in a direction that forms a flow in the same direction as the coolant discharged from the discharge port 141c of the vortex forming pump 141 along the horizontal direction. In that case, if the discharge pressure of the second chip flow pump 144 is increased, the vortex forming pump 141 is not necessarily required.
Similarly to the case of the discharge pump 142, a second filter 145 is attached to the discharge pipe 144b of the second chip flow pump so as to separate and remove impurities contained in the coolant passing through the discharge pipe 144b. It can also be configured.

FIG. 2 is a perspective view showing the structure of the bottom surface portion 121 of the tank 120 in the coolant processing apparatus according to the first embodiment of the present invention. FIG. 2 shows a state where the tank 120 is viewed from the outer surface side (back surface side).
As shown in FIG. 2, a plurality of reinforcing ribs 125 x and 125 y are provided on the outer surface side (back surface side) of the bottom surface portion 121 of the tank 120.

The plurality of reinforcing ribs 125x and 125y are, for example, a plurality of reinforcing ribs 125x arranged in a direction (x direction) along one side of the substantially rectangular tank 120 and a direction (y direction) along the other side of the tank 120. And a plurality of reinforcing ribs 125y.
The number and arrangement interval of these reinforcing ribs 125x and 125y can be freely selected according to the size, material, weight restrictions, etc. of the tank 120.
Further, the reinforcing ribs 125x and 125y are not necessarily arranged orthogonally and need not all be arranged in parallel.

By using such reinforcing ribs 125x and 125y, the strength and rigidity of the entire tank 120 can be increased.
Further, if the reinforcing ribs 125x and 125y are arranged orthogonally as shown in FIG. 2, the central portion of the bottom surface portion 121 of the tank 120 can be maintained flat without being bent by gravity, and the inner surface side of the bottom surface portion 121 is uneven. Therefore, the coolant flow is not obstructed, and a decrease in the coolant flow rate in the vortex can be suppressed.

According to the coolant processing apparatus according to the first embodiment shown in FIG. 1 and FIG. 2, an inflow port for introducing impurities such as chips and sludge contained in the coolant recirculated from the processing apparatus into the tank 120 as a first stage. A relatively large impurity is separated and removed by the first filter 131 provided at the outlet 130.
That is, relatively large impurities that settle on the bottom surface portion 121 can be removed also by the vortex flow of the coolant generated in the tank 120. Similarly, relatively large impurities that cannot be sucked by the discharge pump 142 can be removed.
Subsequently, as a second stage, the coolant that has passed through the first filter 131 is caused to flow into the tank 120, and a vortex of the coolant is formed in the vicinity of the outer peripheral wall 122 in the tank 120, whereby the impurities are vortexed. Concentrate and stay in the vicinity of the center of the tank 120.
Then, as a third stage, impurities staying in the vicinity of the center of the tank 120 are discharged together with the coolant by a discharge pump or the like, and fine impurities are separated and removed by the second filter 145 provided in the discharge pipe of the pump.

By the operations in these stages, impurities contained in the coolant recirculated from the processing apparatus are separated and removed by the first and second filters provided in the pipe or the like through which the coolant flows.
Therefore, it is possible to separate and remove impurities from the coolant without providing a means for separating impurities that require another power, such as a conventional separator or magnetic separator.

In addition, since the rectifying member 123 that rectifies the coolant flow is provided at the corner of the substantially rectangular tank 120, the vortex formed by the coolant flow smoothly changes direction at the corner of the outer peripheral wall 122, A stable coolant flow is formed along the outer peripheral wall 122 in the vicinity of the outer peripheral wall 122 of the tank 120.
As a result, the impurities contained in the coolant do not settle and stay in the vicinity of the outer peripheral wall 122 of the tank 120, but concentrate and stay in the vicinity of the center of the tank 120 due to the vortex. Impurities can be discharged to the outside of the tank 120, and the frequency of maintenance such as cleaning the inside of the tank 120 can be reduced.
Further, since a stable coolant vortex can be formed in the tank 120, coolant rot can be suppressed without formation of coolant stagnation.

<Example 2>
FIG. 3 is a perspective view showing a coolant processing apparatus according to Embodiment 2 of the present invention.
As shown in FIG. 3, the coolant processing apparatus 210 according to the second embodiment of the present invention has a substantially rectangular shape that stores coolant circulated with a processing apparatus (not shown), similar to the coolant processing apparatus 110 according to the first embodiment. The tank 220 includes an inlet 230 through which coolant flowing back from the processing apparatus flows into the tank 220, and a pump group 240 including a plurality of pumps that suck out the coolant in the tank 220.

The substantially rectangular tank 220 includes a bottom surface portion 221 having a substantially rectangular shape, an outer peripheral wall 222 disposed on the outer periphery of the bottom surface portion 221, and a rectifying member 223 provided at a corner where the outer peripheral wall 222 intersects. And.
The flow straightening member 223 arranged at the corner of the substantially rectangular tank 220 is used to smoothly change the direction of the coolant flowing along the outer peripheral wall 222 inside the tank 220 at the corner of the tank 220 to form a vortex. It is a member for forming an inner wall surface, and for example, as shown in FIG. 3, a plurality of planes are continuously arranged to have a substantially curved shape.

Although FIG. 3 illustrates a structure in which a plurality of plane portions are continuously connected, the rectifying member 223 may be formed as one member having a single curved surface as in the case of the first embodiment. .
3 illustrates the configuration in which the four rectifying members 223 are arranged inside the intersecting corners of the four outer peripheral walls 222. However, as in the first embodiment, the outer peripheral wall 222, the rectifying member 223, May be formed integrally, and a shape obtained by deleting the intersection between the outer peripheral walls 222 at the corners may be adopted.

The substantially rectangular tank 220 is provided with an inflow port 230 through which coolant flowing back from a processing device (not shown) flows.
In FIG. 3, the inflow port 230 is disposed in the vicinity of the outer peripheral wall 222 where the coolant flow is formed so as to merge with the vortex generated in the tank 220 described above. Moreover, although the case where two inflow ports 230 are provided is illustrated, one or more inflow ports 230 may be provided.

As in the case of the first embodiment, a first filter 231 that separates large impurities from the coolant that is directly refluxed from the processing apparatus is provided at the outlet of the inlet 230 to the tank 220. At this time, a filter capable of separating impurities having a size of 50 μm, for example, is used as the first filter.
In addition, in order to process a large amount of coolant, it is desirable that the first filter has a cage shape in which filters are attached to the bottom surface and the side surface.
With such an arrangement, the coolant recirculated from the processing apparatus directly joins the flow in the tank 220, and no stagnation occurs in the recirculated coolant. Furthermore, since large chips are collected by the first filter 231, impurities such as chips and sludge mixed in the coolant on the bottom surface portion 221 of the tank 220 can flow along with the vortex without stagnation.

The coolant processing apparatus 210 according to the second embodiment of the present invention includes a pump group 240 including a plurality of pumps.
As shown in FIG. 3, the pump group 240 includes a vortex forming pump 241 used for forming a vortex in the tank 220, and a discharge pump 242 that sucks out the coolant remaining in the center of the tank 220 together with impurities. And a first chip flow pump 243 and a second chip flow pump 244 for sucking out coolant for flowing the chips accumulated in the processing apparatus.

The pump group 240 in the second embodiment is attached to a top plate 226 provided on the upper end side (ceiling side) of the outer peripheral wall 222 of the tank 220 and in the vicinity of the center portion of the tank 220.
And as shown in FIG. 3, the top plate 226 is arrange | positioned in the aspect attached to the beam member 227 arranged in multiple numbers on the ceiling side of the tank 220, for example.

Each pump included in the pump group 240 is connected to a suction pipe (not shown) so that the suction outlet is located near the center of the tank 220 immediately below the top plate 226. Is arranged.
With such an arrangement, the tank 220 of the coolant processing apparatus 210 according to the second embodiment of the present invention is supplied with coolant from the inlet 230, and the coolant is supplied to each tank 220 from each pump included in the plurality of pump groups 240. It has a function of storing coolant in a mode of being discharged to the outside.

FIG. 3 illustrates the case where two systems of the first chip flow pump 243 and the second chip flow pump 244 are provided as pumps for flowing the chips accumulated in the processing apparatus. Depending on the necessity of the area where the chips should flow, one or three or more chips may be disposed.
Further, in the tank 220, the configuration in which the top plate 226 is supported by the beam member 227 is illustrated, but a configuration in which the ceiling portion of the tank 220 is entirely covered by the top plate 226 without using the beam member 227 may be adopted. . However, in this case, the pump group 240 is disposed near the center of the top plate 226.

As in the case of the first embodiment, the vortex forming pump 241 is configured to form a coolant flow (vortex) along the outer peripheral wall 222 of the tank 220 in the substantially rectangular tank 220 of the coolant processing apparatus 210. A suction pipe (not shown) and a discharge pipe 241b are connected.
As shown in FIG. 3, the discharge port 241 c of the discharge pipe 241 b is oriented so as to discharge the coolant in the horizontal direction along the inner side of the outer peripheral wall 222 of the tank 220.
With such an arrangement, the coolant discharged from the discharge port 241 c of the vortex forming pump 241 flows along the outer peripheral wall 222 of the tank 220, and then is flown by the rectifying member 223 arranged at the corner of the tank 220. The flow direction is changed, and the flow flows along the next outer peripheral wall 222.
Then, the coolant flowing along the next outer peripheral wall 222 is changed in the flow direction by the next rectifying member 223 and further flows along the next outer peripheral wall 222. In this way, the coolant in the tank 220 forms a vortex along the outer peripheral wall 222.
Further, the suction ports are arranged so as to be located near the center of the tank 220, respectively.
With such an arrangement, a vortex flow of the coolant is formed toward the vicinity of the center of the tank 240 by the suction force of the individual pumps of the pump group 240.

By forming the vortex flow of the coolant as described above in the tank 220, impurities do not settle and accumulate on the bottom surface portion 221 of the tank 220 in the vicinity of the outer peripheral wall 222 where the coolant flows. Such impurities are concentrated in the vicinity of the central portion of the tank 220 due to the vortex.
As shown in FIG. 3, the discharge pump 242 is used to discharge the impurities remaining in the vicinity of the center of the tank 220 together with the coolant, and includes a suction pipe (not shown) and a discharge pipe 242b. And are connected.

Further, the discharge pipe 242b of the discharge pump 242 is a tool cooling pump that discharges coolant for cooling the processing tool through the second filter 245 outside the tank 220, as in the first embodiment. H.246. The tool cooling pump 246 is connected to a pipe for supplying coolant to a tool mounting portion of a processing apparatus (not shown).
At this time, as the second filter 245, for example, a filter capable of separating impurities having a size of 10 μm is used.

With such a configuration, the impurities staying in the vicinity of the central portion of the tank 220 are discharged together with the coolant to the outside of the tank 220 by the discharge pump 242, so that no impurities remain in the tank 220.
Further, by attaching a second filter 245 capable of separating impurities smaller than the first filter to the discharge pipe 242b of the discharge pump 242, most of the impurities in the tank 220 can be collected by the filter, The frequency of cleaning in the tank 220 can be reduced.

The first chip flow pump 243 is used, for example, to supply coolant for flowing chips in the vicinity of the workpiece of the processing apparatus, and a suction pipe (not shown) and a discharge pipe 243b are connected to each other. Yes.
Here, the discharge pipe 243b is branched to the return pipe 243d on the way, and the discharge port 243c of the return pipe 243d is horizontally aligned along the inner side of the outer peripheral wall 222 of the tank 220 as in the first embodiment. In addition, the coolant is oriented so as to discharge the coolant in the direction of forming the flow in the same direction as the coolant discharged from the discharge port 241c of the vortex forming pump.
In addition, it is preferable that at least one of the discharge ports is disposed upstream of the coolant flow at the inflow port 230.
Similarly to the case of the discharge pump 242, a second filter is attached to the discharge pipe 243b of the first chip flow pump so as to separate and remove impurities contained in the coolant passing through the discharge pipe 243b. It can also be configured.

The second chip flow pump 244 is used, for example, to supply coolant for flowing chips from an auxiliary part (such as a cover) of the processing apparatus, and includes a suction pipe (not shown), a discharge pipe 244b, Is connected.
Here, the discharge pipe 244b branches to the return pipe on the way, similar to the case of the first chip flow pump 243, and the discharge port of the return pipe is the same as in the case of the first embodiment. A configuration in which the coolant is oriented so as to be discharged in a direction that forms a flow in the same direction as the coolant discharged from the discharge pipe 241b of the vortex forming pump in a horizontal direction along the inner side of the outer peripheral wall 22 of the tank 220. You can also In that case, if the discharge pressure of the second chip flow pump 244 is increased, the vortex forming pump 241 is not necessarily required.
Similarly to the case of the discharge pump 242, a second filter is attached to the discharge pipe 244b of the second chip flow pump so as to separate and remove impurities contained in the coolant passing through the discharge pipe 244b. It can also be configured.

FIG. 4 is a perspective view showing the internal structure of the tank 220 with the top plate 226 and the pump group 240 attached thereto removed in the coolant processing apparatus according to the second embodiment of the present invention shown in FIG. is there.
As shown in FIG. 4, the four columns 228 that support the plurality of beam members 227 near the center of the tank 220 are provided inside the tank 220. In addition to the function of supporting the beam member 227, these support columns 228 also have a function of supporting the top plate 226 and a function of attaching and supporting individual pumps of the pump group 240 attached to the top plate 226. Have.
That is, a plurality of support columns 228 are provided at the lower part of the top plate 226.

FIG. 5 is a perspective view of the tank shown in FIG. 4 with the beam member removed from the internal structure.
In the four struts 228, the side surfaces of the struts located on the outer peripheral wall 222 side of the tank 220 are formed with rectifying surfaces 228a that rectify the flow of the coolant formed in the tank 220.
Then, individual pumps included in the pump group 240 or suction pipes connected to the individual pumps are attached to a side surface of the support 228 located on the side of the central portion of the tank 220 opposite to the rectifying surface 228a.

With these configurations, the top plate 226 to which the pump group 240 is attached can be firmly supported, and the rectifying surface 228a is formed on the side surface on the outer peripheral wall 222 side of the tank 220, so that the coolant on the outer peripheral wall side of the support column is Since the flow is not disturbed, a stable coolant vortex in the tank 220 can be formed.
Further, in the four struts 228, the side surfaces of the respective struts located on the center side of the tank 220 are formed with rectifying surfaces 228b that rectify the flow of the coolant formed in the tank 220.
With this configuration, the coolant flow from the outer peripheral wall 222 side to the center side of the tank 220 is not disturbed, so that a stable coolant vortex in the tank 220 can be formed.

Further, as shown in FIG. 3, the discharge port is disposed between the support column 228 and the outer peripheral wall of the tank 220.
The discharge port is preferably disposed between the support column 228 and a rectifying member provided at a corner where the outer peripheral wall of the tank 220 intersects.
With this configuration, the coolant flow from the outer peripheral wall 222 side to the center side of the tank 220 is not disturbed, so that a stable coolant vortex in the tank 220 can be formed.

In addition, since the pump group 240 is concentrated and arranged near the center of the tank 220 using the top plate 226, it is not necessary to provide an area for installing individual pumps outside the tank 220. The area can be reduced and the size can be reduced.
In particular, if an immersion type pump is used as each pump included in the pump group 240, each pump is attached to the top plate 226, and a suction portion (not shown) below the top plate mounting surface of the pump is a tank. By sinking in 220, the suction pipe can be reduced and the height of the coolant processing apparatus can be suppressed.

According to the coolant processing apparatus according to the second embodiment shown in FIGS. 3, 4, and 5, as in the first embodiment, impurities such as chips and sludge contained in the coolant recirculated from the processing apparatus are firstly removed. As a first step, relatively large impurities are separated and removed by the first filter 231 provided at the outlet of the inlet 230 that flows into the tank 220.
That is, relatively large impurities that precipitate on the bottom surface portion 221 can be removed also by the vortex flow of the coolant generated in the tank 220. Similarly, relatively large impurities that cannot be sucked by the discharge pump 242 can be removed.
Subsequently, as a second stage, the coolant that has passed through the first filter 231 is caused to flow into the tank 220, and a vortex of the coolant is formed in the vicinity of the outer peripheral wall 222 in the tank 220, so that the impurities are vortexed. Concentrate and stay in the vicinity of the center of the tank 220.
Then, as a third stage, impurities staying in the vicinity of the center of the tank 220 are discharged together with the coolant by a discharge pump or the like, and fine impurities are separated and removed by the second filter 245 provided in the pump discharge pipe.

By the operations in these stages, impurities contained in the coolant recirculated from the processing apparatus are separated and removed by the first and second filters provided in the pipe or the like through which the coolant flows.
Therefore, it is possible to separate and remove impurities from the coolant without providing a means for separating impurities that require another power, such as a conventional separator or magnetic separator.

In addition, a rectifying member 223 that rectifies the coolant flow is provided at the corner of the substantially rectangular tank 220, and a column 228 including rectifying surfaces 228 a and 228 b is disposed near the center of the tank 220. The vortex flow formed by the coolant flow is smoothly changed in the vicinity of both the corners of the outer peripheral wall 222 and the support column 228, and a stable coolant flow is formed along the outer peripheral wall 222 in the tank 220. The
As a result, the impurities contained in the coolant do not settle and stay in the vicinity of the outer peripheral wall 222 of the tank 220, but concentrate and stay in the vicinity of the central portion of the tank 220 due to the vortex. Impurities can be discharged to the outside of the tank 220, and the frequency of maintenance such as cleaning the inside of the tank 220 can be reduced.
In addition, since a stable coolant vortex can be formed in the tank 220, the coolant can be prevented from decaying without the formation of coolant stagnation.

<Example 3>
FIG. 6 is a perspective view showing an arrangement relationship with a chip collection device when the coolant processing apparatus according to the third embodiment of the present invention is incorporated in a machine tool.
As shown in FIG. 6, the coolant processing apparatus 310 according to the third embodiment of the present invention is disposed in combination with a chip collection apparatus 350 that transports coolant containing chips, sludge, and the like injected in the processing area of the machine tool. Is done.

The chip collection device 350 includes a base 351, a belt-shaped chip conveyor 352 that forms a traveling path on the base 351, and a chip that is disposed at one end of the chip conveyor 352 and collects a remaining material that is transported together with coolant. Bucket 353.
As shown in FIG. 6, the coolant processing device 310 is disposed so as to intersect one end of the travel path of the chip conveyor 352 of the chip collection device 350.
In addition, one end of the chip conveyor 352 protrudes from the base 351 to reach the upper region of the coolant processing apparatus 310, and is held at a high position with respect to the surface of the base 351. The chip bucket 353 is The chip conveyor 352 is disposed immediately below one end.

At one end of the chip conveyor 352, a large residual material or the like conveyed with the coolant falls into the chip bucket 353 and is collected as it is, and the coolant drops and collects on a collection path (not shown) on the back side of the chip conveyor 352. Is done. At this time, the coolant contains impurities such as chips and sludge that could not be separated apart from the remaining material.
The coolant recovered in the recovery path is supplied into the tank from an inlet of a coolant processing device 310 described later.

FIG. 7 is a perspective view showing a coolant processing apparatus according to Embodiment 3 of the present invention.
As shown in FIG. 7, the coolant processing apparatus 310 according to the third embodiment of the present invention, like the coolant processing apparatus 110 according to the first embodiment, stores a substantially rectangular tank 320 that stores coolant circulated between the processing apparatus. And an inlet 330 into which the coolant recirculated from the processing apparatus flows into the tank 320, and a pump group 340 including a plurality of pumps for sucking out the coolant in the tank 320.

The substantially rectangular tank 320 includes a bottom surface portion 321 having a substantially rectangular shape, an outer peripheral wall 322 disposed on the outer periphery of the bottom surface portion 321, and a rectifying member 323 provided at a corner where the outer peripheral wall 322 intersects. And.
As described above, the “substantially rectangular” includes one in which irregularities are formed on part of four sides within a range that does not hinder the formation of the vortex of the coolant. For example, the coolant processing apparatus 310 according to the third embodiment. In the tank 320, a recessed area 320a for arranging the chip bucket 353 is formed.
By providing such a recessed area 320a, the total length of the chip conveyor 352 is shortened, the cost associated with the chip conveyor 352 can be reduced, and the floor area of the entire machine tool can be reduced.

The flow straightening member 323 disposed at the corner of the substantially rectangular tank 320 is used to smoothly change the direction of the coolant flowing along the outer peripheral wall 322 inside the tank 320 at the corner of the tank 320 to form a vortex. It is a member for forming an inner wall surface, and for example, as shown in FIG. 7, a plurality of planes are continuously arranged to have a substantially curved shape.
Although FIG. 7 illustrates a structure in which a plurality of flat portions are continuously connected, the rectifying member 323 may be formed as one member having a single curved surface as in the case of the first embodiment. .
Further, in FIG. 7, the configuration in which the rectifying members 323 are respectively disposed inside the intersecting corners of the outer peripheral wall 322 is illustrated, but the outer peripheral wall 322 and the rectifying member 323 are integrally formed as in the case of the first embodiment. And the shape which deleted the crossing part of the outer peripheral walls 322 may be employ | adopted.

The substantially rectangular tank 220 is provided with an inlet 330 through which the coolant recovered from the chip recovery device 350 described above flows.
In FIG. 7, the inflow port 330 is disposed in the vicinity of the outer peripheral wall 322 where the coolant flow is formed so as to merge with the vortex generated in the tank 320 described above. Moreover, although the case where two inflow ports 330 are provided is illustrated, one or more inflow ports 330 may be provided.

As in the case of the first embodiment, a first filter 331 is provided at the outlet of the inflow port 330 to the tank 320 to separate large impurities from the coolant that recirculates directly from the processing apparatus. At this time, a filter capable of separating impurities having a size of 50 μm, for example, is used as the first filter.
In addition, in order to process a large amount of coolant, it is desirable that the first filter has a cage shape in which filters are attached to the bottom surface and the side surface.
With such an arrangement, the coolant recirculated from the processing apparatus directly joins the flow in the tank 320, and no stagnation occurs in the recirculated coolant. Furthermore, since large chips are collected by the first filter 331, impurities such as chips and sludge mixed in the coolant can flow along with the vortex on the bottom surface portion 321 of the tank 320 without stagnation.

The coolant processing apparatus 310 according to the third embodiment of the present invention includes a pump group 340 including a plurality of pumps.
As shown in FIG. 7, the pump group 340 includes a vortex forming pump 341 used for forming a vortex in the tank 320 and a discharge pump for sucking out the coolant remaining in the vicinity of the center of the tank 320 together with impurities. 342 and a first chip flow pump 343 and a second chip flow pump 344 for sucking out coolant for flowing the chips accumulated in the processing apparatus.
The vortex forming pump 341, the discharge pump 342, the first chip flow pump 343, and the second chip flow pump 344 described above are the same as those described in the first or second embodiment. Since it has a structure and a function, description is abbreviate | omitted here.

As in the case of the second embodiment, the pump group 340 according to the third embodiment is arranged in a mode in which it is attached to the column and the top plate 326 arranged near the center of the tank 320 (in FIG. Since the configuration is the same as that of the second embodiment, the illustration is omitted).
With such an arrangement, the coolant is supplied to the tank 320 of the coolant processing apparatus 310 according to the third embodiment of the present invention from the inlet 330, and the coolant is supplied to each of the tanks 320 from the individual pumps included in the plurality of pump groups 340. It has a function of storing coolant in a mode of being discharged to the outside.

FIG. 7 illustrates a case where two systems of the first chip flow pump 343 and the second chip flow pump 344 are provided as pumps for flowing the chips accumulated in the processing apparatus. Depending on the necessity of the area where the chips should flow, one or three or more chips may be disposed.
Further, in the tank 320, the configuration in which the individual pumps included in the pump group 340 are arranged near the center of the tank 320 is illustrated, but the individual pumps are arranged outside the tank 320 as in the first embodiment. Then, the suction port of the suction pipe may be arranged near the center of the tank 320.

In the coolant processing apparatus 310 according to the third embodiment, in order to form a vortex flow of the coolant in the tank 320, for example, as shown in FIG. 7, the horizontal direction along the inner side of the outer peripheral wall 322 located in the recessed area 320a of the tank 320 is provided. The discharge ports may be oriented so as to discharge the coolant (in FIG. 7, the discharge port 341c of the discharge pipe 341b of the vortex forming pump 341 is disposed).
With such an arrangement, the coolant discharged from the discharge port 341 c of the vortex forming pump 341 flows along the outer peripheral wall 322 of the tank 320 even if the concave region 320 a exists, and then flows by the rectifying member 323. The direction of the flow is changed. In this way, the coolant in the tank 320 forms a vortex along the outer peripheral wall 322.
Further, the suction ports are arranged so as to be located near the center of the tank 320, respectively.
With such an arrangement, a coolant vortex is formed near the center of the tank 340 by the suction force of the individual pumps of the pump group 340.

According to the coolant processing apparatus according to the third embodiment shown in FIG. 6 and FIG. 7, as a first step, a large remaining material is separated from the transported material transported by the chip conveyor 352 of the chip collecting device 350 to remove the coolant. to recover.
Subsequently, as a second stage, relatively large impurities are separated and removed by the first filter 331 provided at the outlet of the inlet 330 that flows into the tank 320.
That is, relatively large impurities that precipitate on the bottom surface portion 321 can be removed by the vortex of the coolant generated in the tank 320. Similarly, relatively large impurities that cannot be sucked by the discharge pump 342 can be removed.
Further, as a third stage, the coolant that has passed through the first filter 331 is caused to flow into the tank 320 and a vortex flow of the coolant is formed in the vicinity of the outer peripheral wall 322 in the tank 320, so that impurities are vortexed by the vortex flow. It is made to concentrate in the vicinity of the central part of 320 and stay.
Then, as a fourth stage, impurities staying in the vicinity of the center of the tank 320 are discharged together with the coolant by the discharge pump 342 or the like, and fine impurities are separated and removed by the second filter 345 provided in the discharge pipe of the pump.

By the operations in these stages, impurities contained in the coolant recirculated from the processing apparatus are separated and removed by the first and second filters provided in the pipe or the like through which the coolant flows.
Therefore, it is possible to separate and remove impurities from the coolant without providing a means for separating impurities that require another power, such as a conventional separator or magnetic separator.

In addition, since the rectifying member 323 that rectifies the coolant flow is provided at the corner of the substantially rectangular tank 320, the vortex formed by the coolant flow smoothly flows at the corner of the outer peripheral wall 322. A stable coolant flow is formed in the tank 320 along the outer peripheral wall 322.
As a result, the impurities contained in the coolant do not settle and stay in the vicinity of the outer peripheral wall 322 of the tank 320, but concentrate and stay in the vicinity of the central portion of the tank 320 due to the vortex. Impurities can be discharged to the outside of the tank 320, and the frequency of maintenance such as cleaning the inside of the tank 320 can be reduced.
Further, since a stable vortex of the coolant can be formed in the tank 320, the decay of the coolant can be suppressed without the formation of coolant stagnation.

In addition, this invention is not limited to the structure of above-described Examples 1-3, Various modifications are included.
For example, in the coolant processing apparatus of the present invention, an example of a shape in which a concave region for a chip bucket is provided in a tank is illustrated, but if it is not necessary to consider a reduction in the floor area of the entire machine tool, the concave region is not provided. May be.
Further, the present invention may be applied by combining the matters described in the first to third embodiments.
For example, the configuration of the reinforcing rib on the back side of the bottom surface of the tank shown in FIG. 2 of the first embodiment can be applied to the bottom surface of the tank shown in the second or third embodiment.

110, 210, 310 Coolant treatment devices 120, 220, 320 (substantially rectangular) tanks 121, 221, 321 Bottom surface portions 122, 222, 322 Outer peripheral walls 123, 223, 323 Rectifier members 130, 230, 330 Inlet ports 131, 231 331 First filter 140, 240, 340 Pump group 141, 241, 341 Eddy current forming pump 142, 242, 342 Discharge pump 143, 243, 343 First chip flow pump 144, 244, 344 Second Pumps 145, 245, 345 for second chips 125x, 125y Reinforcing ribs 226, 326 Top plate 227 Beam member 228 Column 350 Chip collection device 352 Chip conveyor 353 Chip bucket

In order to achieve the above object, a coolant processing apparatus of the present invention includes a substantially rectangular tank for storing coolant, an inlet for allowing the coolant to flow into the tank, and a plurality of pumps for sucking out the coolant in the tank. , a coolant processing device Ru provided with, comprising a first filter to the outlet of the said tank of said inlet, said tank, the corners at the intersection of the outer peripheral wall, said coolant along said outer peripheral wall A flow straightening member is provided, and a plurality of pump suction ports are provided in the vicinity of the center, and a discharge port for discharging a part of the coolant sucked out by the plurality of pumps is near the outer peripheral wall of the tank. are provided in the vicinity of the center portion of the tank, the top plate mounting a plurality of pumps are provided, the plurality of pumps mounted below the top plate A plurality of struts attached is formed.

Also, the second filter is provided on at least one discharge pipe of the plurality of pumps.

In yet another aspect of the coolant processing device of the present invention, prior Symbol plurality of struts, the outer peripheral wall side and the central side and rectifying surface for rectifying the flow of the coolant in the tank is formed.
In addition, at least one of the discharge ports is disposed between any one of the plurality of support columns and the outer peripheral wall of the tank.

Claims (11)

A coolant processing apparatus comprising: a substantially rectangular tank for storing coolant; an inlet for allowing the coolant to flow into the tank; and a plurality of pumps for sucking out the coolant in the tank;
The tank includes a rectifying member that rectifies the flow of the coolant along the outer peripheral wall at a corner portion where the outer peripheral walls intersect, and includes suction ports of the plurality of pumps in the vicinity of the center portion.
A coolant processing apparatus, wherein a discharge port for discharging a part of the coolant sucked out by the plurality of pumps is provided in the vicinity of an outer peripheral wall of the tank. The coolant processing apparatus according to claim 1, wherein the discharge port is disposed so as to discharge the coolant in a horizontal direction along an outer peripheral wall of the tank. 3. The coolant processing apparatus according to claim 2, wherein at least two of the discharge ports are arranged in the same direction as the flow of the coolant along the outer peripheral wall. The coolant processing apparatus according to claim 3, wherein at least one of the discharge ports is disposed upstream of a coolant flow at the inlet. The coolant processing apparatus according to claim 4, further comprising a first filter at an outlet of the inlet to the tank. The coolant processing apparatus according to claim 5, wherein a second filter is provided in at least one discharge pipe of the plurality of pumps. The coolant treatment according to claim 6, wherein a top plate to which the plurality of pumps are attached is provided near the center of the tank, and a plurality of support columns are formed at a lower portion of the top plate. apparatus. The coolant treatment apparatus according to claim 7, wherein the plurality of support columns are formed with a rectifying surface that rectifies the flow of the coolant on an outer peripheral wall side of the tank. The coolant processing apparatus according to claim 8, wherein the plurality of struts are formed with a rectifying surface for rectifying the flow of the coolant on a central portion side of the tank. The coolant treatment apparatus according to claim 7, wherein the discharge port is disposed between any one of the plurality of support columns and an outer peripheral wall of the tank. 11. The coolant processing apparatus according to claim 1, wherein a bottom surface of the tank is a horizontal surface, an inner surface side thereof is smooth, and a plurality of reinforcing ribs are provided on an outer surface side.

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