JP5470657B2 - Treatment liquid purification device - Google Patents

Description

  The present invention is a process for recovering and purifying grinding, cutting fluid, etc. (hereinafter referred to as processing liquid) used for the purpose of lubrication and cooling during grinding, cutting, etc. by a machine tool or the like (processing liquid supply part). The present invention relates to a liquid purification apparatus. More specifically, a solid-liquid separation that includes a treatment liquid tank that stores the treatment liquid, a hopper that guides the collected treatment liquid recovered from the treatment liquid supply unit into the treatment liquid tank, and that separates the treatment liquid into a solid-liquid separation. Provided with a pump for sucking the foreign matter precipitated at the bottom of the processing liquid tank from the processing liquid collection port provided in the deep part of the processing liquid tank together with the processing liquid and conveying it to the solid-liquid separator, The present invention relates to a processing liquid purification apparatus including a supply unit for supplying a processing liquid that has been subjected to solid-liquid separation to a processing liquid supply unit.

  As such a processing liquid purifying apparatus, a processing liquid tank for collecting and purifying processing liquid containing foreign matters such as chips used in machine tools is provided, and curved plates are provided at four corners of the processing liquid tank. A configuration is known in which the flow of the processing liquid generated in the processing liquid tank is smoothly circulated in the horizontal direction along the peripheral wall of the processing liquid tank (see, for example, Patent Document 1). Thereby, it is considered that the foreign matter that settles in the processing liquid tank is accumulated at the center of the vortex generated by the centripetal force, and the foreign matter can be separated efficiently.

Japanese Patent No. 4346447

  However, according to such a treatment liquid purifying apparatus, precipitates in the treatment liquid can be accumulated in the central portion of the bottom plate of the treatment liquid tank, but foreign matters floating below the liquid surface in the treatment liquid tank (hereinafter referred to as floating The power to collect foreign substances) does not work very much. In addition, the pump that conveys the processing liquid from the processing liquid tank to the solid-liquid separator is usually a processing liquid tank for the purpose of efficiently discharging and separating the foreign matter deposited on the bottom of the processing liquid tank from the processing liquid tank. The foreign matter deposited on the bottom portion is sucked together with the treatment liquid from the treatment solution collection port provided in the deep portion near the bottom portion. Therefore, it cannot be said that the floating foreign matter can be removed sufficiently efficiently.

  In view of the above circumstances, an object of the present invention is to provide a processing liquid purification apparatus capable of efficiently transporting and removing not only precipitated foreign substances but also floating foreign substances from a processing liquid collected in a processing liquid tank to a solid-liquid separator. Is realized by a simpler and more rational configuration.

〔Constitution〕
In order to achieve the above object, a processing liquid purification apparatus of the present invention includes a processing liquid tank that stores processing liquid, and includes a hopper that guides the recovered processing liquid collected from the processing liquid supply unit into the processing liquid tank. A solid-liquid separator that separates the processing liquid into solid and liquid, and sucks foreign matter that has settled at the bottom of the processing liquid tank from the processing liquid collection port provided in the deep part of the processing liquid tank together with the processing liquid. A processing liquid purifying apparatus provided with a pump for transporting to a solid-liquid separator, and having a supply unit for supplying the processing liquid subjected to solid-liquid separation to a processing liquid supply unit,
The processing liquid tank is provided with a circulation mechanism for circulating the processing liquid in the horizontal direction inside the processing liquid tank, and the processing liquid circulating in the processing liquid tank is introduced from a shallower part closer to the liquid surface than the deep part. Ri Ah is provided an induction part that induces the deep, the guide portion is, in the processing liquid tank, is inclined to be gradually deeper from the upstream side toward the downstream side for circulating said treatment liquid in a horizontal direction the It is in the point comprised from the bottom face of a hopper .

[Function and effect]
When the recovered processing liquid is received in the processing liquid tank via the hopper, the recovered processing liquid is stored in the processing liquid tank as a processing liquid. The stored processing liquid is supplied to the solid-liquid separator by the pump and separated into solid and liquid, and only the processing liquid with few foreign matters is supplied to a processing liquid supply part such as a machine tool.

  Here, if a circulation mechanism is provided in the processing liquid tank, the processing liquid can be circulated while forming a horizontal liquid surface in the processing liquid tank. By the circulation of this treatment liquid, the foreign substances contained in the recovered treatment liquid are efficiently circulated, and the specific gravity is relatively large, and the precipitated foreign substances are accumulated deep in the center of the vortex generated by centripetal force. Can do. Therefore, the foreign matter that precipitates is sucked from the processing liquid collection port provided in the deep part, supplied to the solid-liquid separator together with the processing liquid, and after solid-liquid separation, the supply unit as the processing liquid from which the foreign matter has been removed It becomes the structure supplied to a process liquid supply part. Here, the deep part in the present application refers to a range in which the treatment liquid collection port can be installed in the treatment liquid tank capable of sucking foreign matter precipitated at the bottom part through the treatment liquid collection port. Moreover, a shallow part shows the range close | similar to a liquid level rather than a deep part.

  On the other hand, of the foreign substances contained in the recovered processing liquid, those with a specific gravity close to that of the processing liquid float in the shallow part of the processing liquid tank near the processing liquid level in combination with fine bubbles generated in the processing liquid tank. Will do. The foreign matter that floats in the shallow portion as described above is also circulated within the processing liquid tank together with the processing liquid by the circulation mechanism. When a guiding unit for guiding the processing liquid circulating in the processing liquid tank from the shallow part to the deep part is provided in the processing liquid tank, the floating foreign matter circulates in the processing liquid tank, Guided from shallow to deep along the flow. Therefore, the floating foreign matter can be made to flow close to the depth near the bottom where the foreign matter to be precipitated is present. For this reason, when the processing liquid is supplied from the processing liquid tank to the solid-liquid separator by the pump, the floating foreign substances can be taken into the pump together with the foreign substances precipitated at the bottom of the processing liquid tank. Therefore, not only the settled foreign matter but also the floating foreign matter can be efficiently transported to the solid-liquid separator and removed.

Furthermore, the guiding section may be provided basically anywhere in the processing liquid tank, but if it is provided in the hopper, the configuration change in the entire processing liquid purification apparatus can be extremely small. Furthermore, if the guiding portion is configured by the bottom surface of the hopper that is inclined so as to gradually become deeper from the upstream side to the downstream side of the flow that circulates the processing liquid in the horizontal direction, an existing hopper is used as the guiding portion. The guide portion can be configured by simply changing the configuration of the hopper and changing the configuration of the hopper so as to partially deform the hopper. Thereby, it is possible to guide the floated foreign matter together with the settled foreign matter along the inclined bottom surface and easily convey the foreign matter to the solid-liquid separator. Furthermore, the flow of the processing liquid accelerated downward by the action of gravity can be changed to the side to form a circulation mechanism that forms the flow of the processing liquid in the processing liquid tank.

〔Constitution〕
A rectifying plate that rectifies the processing liquid that circulates in the processing liquid tank and flows below the hopper from a shallow part to a deep part may be provided in the hopper.

[Function and effect]
While the processing liquid circulates in the processing liquid tank and reaches the guiding portion, the processing liquid is guided from a shallow part to a deep part of the processing liquid tank, and a hopper in the processing liquid tank circulates the processing liquid. It becomes the flow resistance of the flow. Therefore, there is a possibility that the flow of the processing liquid is disturbed, and the effect that the processing liquid moves from the shallow part to the deep part by the guide part is not sufficiently exhibited. Therefore, if a flow straightening plate is provided to rectify the flow that flows under the hopper, the flow straightening plate prevents the flow of the processing liquid that is stagnant by the hopper from deviating from the hopper and going to the side. To do. That is, the current plate assists the effect of guiding and guiding the flow of the processing solution to move from the shallow part to the deep part.

〔Constitution〕
In order to achieve the above object, a processing liquid purification apparatus of the present invention includes a processing liquid tank that stores processing liquid, and includes a hopper that guides the recovered processing liquid collected from the processing liquid supply unit into the processing liquid tank. A solid-liquid separator that separates the processing liquid into solid and liquid, and sucks foreign matter that has settled at the bottom of the processing liquid tank from the processing liquid collection port provided in the deep part of the processing liquid tank together with the processing liquid. A processing liquid purification apparatus comprising a supply unit for supplying a processing liquid supply unit to the processing liquid supply unit, wherein a pump for transporting the solid-liquid separator is provided,
The processing liquid tank is provided with a circulation mechanism for circulating the processing liquid in the horizontal direction inside the processing liquid tank, and the processing liquid circulating in the processing liquid tank is introduced from a shallower part closer to the liquid surface than the deep part. There is provided a guiding portion that guides to the deep portion, and a rectifying plate that rectifies the processing liquid that circulates in the processing liquid tank and flows below the hopper from the shallow portion toward the deep portion is provided in the hopper. There is a point.
[Function and effect]
When the recovered processing liquid is received in the processing liquid tank via the hopper, the recovered processing liquid is stored in the processing liquid tank as a processing liquid. The stored processing liquid is supplied to the solid-liquid separator by the pump and separated into solid and liquid, and only the processing liquid with few foreign matters is supplied to a processing liquid supply part such as a machine tool.
Here, if a circulation mechanism is provided in the processing liquid tank, the processing liquid can be circulated while forming a horizontal liquid surface in the processing liquid tank. By the circulation of this treatment liquid, the foreign substances contained in the recovered treatment liquid are efficiently circulated, and the specific gravity is relatively large, and the precipitated foreign substances are accumulated deep in the center of the vortex generated by centripetal force. Can do. Therefore, the foreign matter that precipitates is sucked from the processing liquid collection port provided in the deep part, supplied to the solid-liquid separator together with the processing liquid, and after solid-liquid separation, the supply unit as the processing liquid from which the foreign matter has been removed It becomes the structure supplied to a process liquid supply part. Here, the deep part in the present application refers to a range in which the treatment liquid collection port can be installed in the treatment liquid tank capable of sucking foreign matter precipitated at the bottom part through the treatment liquid collection port. Moreover, a shallow part shows the range close | similar to a liquid level rather than a deep part.
On the other hand, of the foreign substances contained in the recovered processing liquid, those with a specific gravity close to that of the processing liquid float in the shallow part of the processing liquid tank near the processing liquid level in combination with fine bubbles generated in the processing liquid tank. Will do. The foreign matter that floats in the shallow portion as described above is also circulated within the processing liquid tank together with the processing liquid by the circulation mechanism. When a guiding unit for guiding the processing liquid circulating in the processing liquid tank from the shallow part to the deep part is provided in the processing liquid tank, the floating foreign matter circulates in the processing liquid tank, Guided from shallow to deep along the flow. Therefore, the floating foreign matter can be made to flow close to the depth near the bottom where the foreign matter to be precipitated is present. For this reason, when the processing liquid is supplied from the processing liquid tank to the solid-liquid separator by the pump, the floating foreign substances can be taken into the pump together with the foreign substances precipitated at the bottom of the processing liquid tank. Therefore, not only the settled foreign matter but also the floating foreign matter can be efficiently transported to the solid-liquid separator and removed.
While the processing liquid circulates in the processing liquid tank and reaches the guiding portion, the processing liquid is guided from a shallow part to a deep part of the processing liquid tank, and a hopper in the processing liquid tank circulates the processing liquid. It becomes the flow resistance of the flow. Therefore, there is a possibility that the flow of the processing liquid is disturbed, and the effect that the processing liquid moves from the shallow part to the deep part by the guide part is not sufficiently exhibited. Therefore, if a flow straightening plate is provided to rectify the flow that flows under the hopper, the flow straightening plate prevents the flow of the processing liquid that is stagnant by the hopper from deviating from the hopper and heading to the side. To do. That is, the current plate assists the effect of guiding and guiding the flow of the processing solution to move from the shallow part to the deep part.

〔Constitution〕
The processing liquid collection port may be opened toward the upstream side where the processing liquid circulates in the horizontal direction.
[Function and effect]
In the above-described configuration, the flow of the processing liquid in the processing liquid tank is largely due to the supply energy of the recovered processing liquid supplied via the hopper. However, by comparing the capacity of the processing liquid tank and the supply amount of the recovered processing liquid, it may be assumed that the processing liquid cannot form a sufficient circulation flow. Therefore, when the processing liquid collection port is opened toward the upstream side circulating in the horizontal direction of the processing liquid at a deep portion of the processing liquid tank, the suction force by which the pump collects the processing liquid is A circulation flow of the treatment liquid can be formed and can function as a circulation mechanism. Thereby, it becomes possible to smoothly take in the foreign matter that floats along with the treatment liquid and is guided to the deep part.

〔Constitution〕
The supply section is provided with a relief valve for limiting the treatment liquid supply pressure to the treatment liquid supply section, and a return path for circulating the return liquid from the relief valve to the treatment liquid tank is connected to the relief valve. The opening of the return path may be opened toward the downstream side circulating in the horizontal direction of the processing liquid.

[Function and effect]
When supplying the processing liquid from the supply unit to the processing liquid supply unit such as a machine tool, if the relief valve is provided, the processing liquid supply pressure to the processing liquid supply unit is maintained constant. Therefore, stable operation of the treatment liquid supply unit can be achieved. On the other hand, from the relief valve, a return liquid of the processing liquid supplied exceeding a necessary supply pressure is generated, and this return liquid is supplied to the processing liquid tank. Therefore, a return path for returning the return liquid to the treatment liquid tank is provided, and the opening is opened toward the flow direction of the treatment liquid in the treatment liquid tank, that is, toward the downstream side circulating in the horizontal direction of the treatment liquid. Accordingly, the flow of the return liquid can also contribute to forming a circulation flow of the processing liquid in the processing liquid tank.

  Therefore, according to the processing liquid purification apparatus of the present invention, the foreign matter in the processing liquid tank not only settles but also floats, and more reliably transports it to the solid-liquid separator for solid-liquid separation. Since it can be removed, a cleaner processing liquid containing no foreign matter can be stably supplied to the processing liquid supply part. Furthermore, in the processing liquid supply part to which clean processing liquid is stably supplied, the operational stability of the processing liquid supply part can be improved, for example, the machine tool can be operated with higher accuracy.

Longitudinal side view of the treatment liquid purification apparatus of the present invention The top view of the processing liquid purification apparatus of this invention Longitudinal front view of the treatment liquid purification apparatus of the present invention Detailed view of a hopper used in the treatment liquid purification apparatus of the present invention The figure which shows the different form of a guidance part

  Below, the processing liquid purification apparatus of this invention is demonstrated. Preferred examples are described below, but these examples are described in order to more specifically illustrate the present invention, and various modifications can be made without departing from the spirit of the present invention. The present invention is not limited to the following description.

  As shown in FIGS. 1 to 3, the recovered processing liquid a containing foreign matter such as cutting waste in the coolant is discharged from the machine tool 1 as the processing liquid supply portion. The processing liquid purification apparatus of the present invention includes a processing liquid tank 2 that receives the recovered processing liquid a as a processing liquid to be purified, and includes a solid-liquid separator 3 that separates the recovered processing liquid a into a solid and liquid. In addition, the recovery processing liquid a is supplied to the solid-liquid separator 3, and the supply section 4 for supplying the solid processing liquid b to the machine tool 1 is supplied and discharged from the solid-liquid separator 3. The sludge tank 5 which stores the sludge c to be used is provided.

  As shown in FIG. 2 and the like, the processing liquid tank 2 includes a rectangular box-shaped liquid storage tank 20, and includes a hopper 6 that receives the recovered processing liquid a discharged from the machine tool 1, and the recovered processing liquid a Is stored and the foreign matter a1 is precipitated and accumulated. The shape of the treatment liquid tank 2 is not limited to a rectangle, and various forms such as a square, a circle, and a donut shape can be adopted.

  Curved plates 21 are provided at the four corners of the processing liquid tank 2 and serve to smoothly circulate the flow of the processing liquid along the peripheral wall of the processing liquid tank 2 (see FIG. 2). The supply unit 4 includes a processing liquid collection path 41 and a processing liquid collection port 42 that collect the processing liquid in the processing liquid tank 2, pump the water by the pump 40, and supply it to the solid-liquid separator 3. In the processing liquid tank 2, the processing liquid collection port 42 is provided in a deep part near the bottom of the processing liquid tank 2. Further, the return path 43 that receives the surplus processing liquid d returned from the supply unit 4 is opened toward the downstream side in which the opening 46 of the return path 43 circulates in the horizontal direction in a plan view of the processing liquid. (See FIGS. 2 and 3).

  Here, as shown in FIG. 4, the hopper 6 includes a hopper main body 60 having an open top surface and a strainer 61, and a recovery process in which the strainer 61 drops and supplies the hopper main body 60. A relatively large foreign matter can be removed from the liquid a. Further, the hopper body 60 has three side wall surfaces 62a, 62b, 62c and a bottom surface 63, so that the recovery processing liquid a dropped from above is received from the top surface, and the side portion 62d side having no wall surface is provided. Can be guided to. As a result, the hopper 6 causes the collected processing liquid a to flow out sideways by the side wall surfaces 62a, 62b, 62c and the bottom surface 63, thereby allowing the processing liquid to flow into the processing liquid tank 2. It functions as a circulation mechanism F that circulates in the horizontal direction of the treatment liquid tank 2.

  The configuration of the hopper 6 will be described in detail. The side wall portion of the hopper 6 has a side wall surface 62a having the lowest height at a portion facing the upstream side in the flow direction of the processing liquid from the predetermined height to the inside of the processing liquid tank 2. Place in a hanging position. Furthermore, side wall surfaces 62b and 62c having a side which extends in the height direction with the side wall surface 62a and having a side extending in the height direction as an upper base are provided connected to the side wall surface 62a. It arrange | positions in the said dripping attitude | position inside the said processing liquid tank 2 from height. Furthermore, in plan view, the bottom surface 63 surrounded by the side wall surfaces 62a, 62b, 62c is formed so that the periphery is shared with the lower side (the lower side in FIG. 4) of each side wall surface 62a, 62b, 62c, and The bottom surface 63 is formed as an inclined surface that gradually becomes deeper from one side through which the processing liquid circulates toward the other side. A rectifying plate 64 (described later) extends downward on the side wall surface 62b. That is, as a whole, the hopper 6 has a shape in which an upper part surrounded by the side wall surfaces 62a, 62b, 62c is opened above the processing liquid tank 2. As a result, the hopper 6 is surrounded by the side wall surfaces 62a, 62b, 62c and the bottom surface 63, and the recovered processing liquid a received from above is guided and discharged to the side portion 62d having no wall surface. The processing liquid is supplied into the processing liquid tank so as to form a flow of processing liquid from the side wall surface 62a toward the side portion 62d. Thereby, a circulating flow is formed inside the processing liquid tank 2.

  The hopper 6 is disposed in the vicinity of the central portion on the long side of the processing liquid tank 2 (see FIG. 2), and the processing liquid formed in the processing liquid tank 2 by sucking the flow of the processing liquid. This flow generates a horizontal vortex inside the processing liquid tank 2. And the foreign material a1 which precipitates large specific gravity, such as the metal chips contained in the collection processing liquid a, accumulates in the center of the processing liquid tank 2 while turning. On the other hand, in a side view, when the circulating flow formed in the processing liquid tank 2 reaches the hopper 6, the side wall surface 62a (as the liquid level is low when the liquid level is low) positioned as the upstream end surface of the hopper 6. Then, the flow of the processing liquid accompanied by the foreign matter floating in the shallow portion of the processing liquid tank 2 is collided with the bottom surface 63), and the direction is changed toward a deeper portion relatively deeper than the shallow portion. The flow of the processing liquid whose direction has been changed is configured to be guided further deeper along the bottom surface 63 as the guiding portion G. Since the side wall 62b is located on the center side of the circulating flow, a rectifying plate 64 is extended below the side wall 62b of the hopper 6. Thereby, it is possible to suppress the circulating flow from deviating toward the central portion of the processing liquid tank 2 of the circulating flow without passing below the bottom surface 63.

  In the configuration shown in FIG. 4, the inclination of the bottom surface 63 gradually becomes deeper from the upstream side to the downstream side where the processing liquid circulates at an angle of about 10 ° to 45 ° with respect to the processing liquid level. It is set to be. Further, the side wall surface 62a of the hopper 6 is a shallow portion in the vicinity of the liquid surface of the processing liquid tank 2 and dams up the foreign matter a2 generated on the liquid surface of the processing liquid. The height of the side wall surface 62a is set to a height that can be guided from a shallow portion (near the liquid surface) to a deep portion (in the liquid) via the lower part of the hopper 6 by the circulating flow of the processing liquid. For example, in FIG. 4, when the floating foreign material a <b> 2 circulates and reaches the hopper 6, the bottom of the hopper 6 is easily lowered from the shallow portion to the deep processing liquid collection port 42 by the bottom surface 63. Guided.

  1 and 2, a cyclone solid-liquid separator is provided as an example of the solid-liquid separator 3. The solid-liquid separator 3 separates the processing liquid supplied by the supply unit 4 so as to generate a vortex by solid-liquid separation by a centrifugal separation action, and extracts a clean processing liquid b from the upper separated liquid extraction unit 31. , Supplied to the machine tool 1. Further, the sludge c, which is a solid component separated by solid-liquid separation, is taken out from the lower sludge nozzle 32.

  The supply unit 4 is configured by connecting a processing liquid collection path 41 and a processing liquid supply path 43 to the solid-liquid separator 3. The processing liquid collection path 41 is connected to a pump 40 that pumps up the processing liquid in the processing liquid tank 2 together with the foreign matter a1 that precipitates from a processing liquid collection port 42 provided in a deep portion near the bottom in the processing liquid tank 2. Has been. The processing liquid collection path 41 is a path for supplying the processing liquid pumped up by the pump 40 into the solid-liquid separator 3 through a processing liquid input part 33 provided in the solid-liquid separator 3. Further, the processing liquid supply path 43 takes out the liquid phase portion separated from the liquid separating portion 31 at the upper end in the axial direction of the solid-liquid separator 3 as a clean processing liquid b and supplies it to the machine tool 1. It is a route.

  The processing liquid collection port 42 opens into the processing liquid tank 2 toward the upstream side in the circulation direction of the processing liquid, and sucks the processing liquid from the processing liquid collection port 42. Thereby, the circulation flow of the processing liquid in the processing liquid tank 2 is accelerated. That is, the configuration in which the processing liquid collection port 42 is opened toward the upstream side in the circulation direction of the processing liquid in the supply unit 4 also functions as a circulation mechanism F that circulates the processing liquid in the horizontal direction in the processing liquid tank 2. .

  A pressure control valve 44 is provided in the processing liquid supply path 43 to limit the supply pressure of the processing liquid supplied to the machine tool 1 to a predetermined pressure (see FIG. 1). The processing liquid collection channel 41 is provided with a relief valve 45, and the processing liquid return liquid d supplied to the solid-liquid separator 3 (or pressure control valve 44) exceeding a predetermined pressure is supplied to the processing liquid tank 2. A return path 47 is provided to circulate back to (see FIGS. 2 and 3). The opening 46 of the return path 47 is opened toward the downstream side where the processing liquid circulates in the horizontal direction, and this configuration accelerates the circulation flow of the processing liquid in the processing liquid tank 2. As described above, the configuration in which the opening 46 of the return path 47 is opened toward the downstream side in which the processing liquid is circulated in the horizontal direction is also a circulation mechanism F that circulates the processing liquid in the horizontal direction inside the processing liquid tank 2. Function as.

  The sludge tank 5 includes a storage tank 50 that receives and stores a sludge c containing a solid content discharged from the solid-liquid separator 3 at a high concentration. In the storage tank 50, the sludge c dropped from the sludge nozzle 32 of the solid-liquid separator 3 is further subjected to solid-liquid separation by precipitation separation. The sludge tank 5 is provided with a conveyor-type solid content scraping device (not shown) so that sludge c having a low liquid content can be discharged out of the sludge tank 5 (in the figure). Arrow e). The liquid phase portion from which the sludge c has been separated is returned and supplied from the sludge tank 5 into the hopper 6 of the treatment liquid tank 2 via the return pipe 51.

  With the above-described configuration, the collected processing liquid a supplied from the machine tool 1 is introduced into the hopper 6 after the rough foreign matter is removed by the strainer 61, and the processing liquid tank 2 is put into the processing liquid tank 2 by the inclined bottom surface 63. Flows in the direction of circulation. Due to the circulating flow formed thereby, the foreign matter a1 having a large specific gravity precipitates while circulating through the processing liquid tank 2 and accumulates at the center bottom of the processing liquid tank 2. Further, the foreign matter a2 having a small specific gravity contained in the processing liquid floats in a shallow portion near the liquid surface together with fine bubbles.

  The circulation flow of the processing liquid is further accelerated by the flow of the processing liquid formed by the processing liquid collection port 42 in the processing liquid collection path 41 and the flow of the processing liquid returned from the opening 46 in the return path 43. . Therefore, a circulating flow can be formed in the processing liquid tank 2 with a compact and simple configuration. Further, the formed circulation flow smoothly flows without curling in the processing liquid tank 2 by the curved plate 21.

  The flow of the processing liquid thus circulated reaches the hopper 6 while circulating and moving the foreign matter a2 that floats, and is relatively deeper than the shallow part from the shallow part close to the liquid surface by the guidance of the hopper 6. The depth reaches a depth near the bottom of the processing liquid tank 2. Then, the floating foreign substance a2 is easily taken in from the processing liquid collection port 42 provided in the deep part of the processing liquid tank 2. That is, not only the processing liquid and the foreign matter a1 that precipitates but also the foreign matter a2 that floats can be taken from the processing liquid collection port 42 and transferred to the solid-liquid separator 3 for separation and removal.

  Then, in the processing liquid tank 2, it is possible to suppress the floating foreign substance a2 from remaining in a shallow portion that is difficult to remove.

[Another embodiment]
As the solid-liquid separator 3, a cyclone type is exemplified in the above-described embodiment, but a filtration unit in which a crossflow mechanism, a centrifugal separation mechanism, a cartridge filter mechanism, etc. are arranged in a sealed housing is provided. What is selected from the configuration and the like can be applied as appropriate.

  In the above example, the guiding portion G is configured by the bottom surface 63 of the hopper 6. However, the foreign material a <b> 2 that floats by attaching another member is guided from the shallow portion to the deep portion of the processing liquid tank 2. Also good. Specifically, as shown in FIG. 5, a guide plate 65 a that dams the floating foreign material a <b> 2 on the upstream side of the processing liquid flow on the side wall portion 62 a of the hopper 6 and draws it downward, and the guide plate 65 a A guide member provided with an inclined plate 65b for guiding the floating foreign material a2 from the lower end to the lower side of the hopper 6 can be provided as the guide portion G.

  The circulation mechanism F is configured so that the flow of the processing liquid is formed in the processing liquid tank mainly by the hopper 6, the processing liquid collection port 42, and the opening 46 of the return path 47. However, the present invention is not limited to this, and a configuration in which a flow is formed in the processing liquid tank in various known forms can be employed.

  According to the treatment liquid purifying apparatus of the present invention, it is possible to collect and purify grinding and cutting fluid used for the purpose of lubrication and cooling during grinding and cutting with a machine tool or the like. A cleaner processing liquid containing no foreign matter can be stably supplied.

1 Machine tool (treatment liquid supply part)
2 Processing liquid tank 3 Solid-liquid separator 4 Supply part 40 Pump 42 Processing liquid collection port 44 Relief valve 47 Return path 6 Hopper 63 Bottom face 64 Current plate F Circulation mechanism G Guide part

Claims (5)

A processing liquid tank for storing the processing liquid, a hopper for guiding the recovered processing liquid recovered from the processing liquid supply unit into the processing liquid tank, and a solid-liquid separator for separating the processing liquid into a solid and a liquid, A solid-liquid separator is provided with a pump for sucking together with the processing liquid the foreign matter precipitated at the bottom of the processing liquid tank from the processing liquid collection port provided in the deep part of the processing liquid tank and transporting it to the solid-liquid separator. A treatment liquid purification apparatus including a supply unit for supplying the treated liquid to the treatment liquid supply unit,
The processing liquid tank is provided with a circulation mechanism for circulating the processing liquid in the horizontal direction inside the processing liquid tank, and the processing liquid circulating in the processing liquid tank is introduced from a shallower part closer to the liquid surface than the deep part. Ri Oh provided a guide portion to guide the deep,
The processing liquid purification apparatus , wherein the guide section is configured by a bottom surface of the hopper that is inclined so as to gradually become deeper from an upstream side that circulates the processing liquid in a horizontal direction toward a downstream side in the processing liquid tank . The processing liquid purification apparatus according to claim 1 , wherein a rectifying plate that rectifies the processing liquid flowing in the processing liquid tank and flowing below the hopper from a shallow part to a deep part is provided in the hopper. A processing liquid tank for storing the processing liquid, a hopper for guiding the recovered processing liquid recovered from the processing liquid supply unit into the processing liquid tank, and a solid-liquid separator for separating the processing liquid into a solid and a liquid, A solid-liquid separator is provided with a pump for sucking together with the processing liquid the foreign matter precipitated at the bottom of the processing liquid tank from the processing liquid collection port provided in the deep part of the processing liquid tank and transporting it to the solid-liquid separator. A treatment liquid purification apparatus including a supply unit for supplying the treated liquid to the treatment liquid supply unit,
The processing liquid tank is provided with a circulation mechanism for circulating the processing liquid in the horizontal direction inside the processing liquid tank, and the processing liquid circulating in the processing liquid tank is introduced from a shallower part closer to the liquid surface than the deep part. A guiding part for guiding to the deep part is provided;
A processing liquid purification apparatus, wherein a rectifying plate for rectifying the processing liquid flowing in the processing liquid tank and flowing below the hopper from the shallow portion toward the deep portion is provided in the hopper.   The processing liquid purification apparatus according to claim 1, wherein the processing liquid collection port is opened toward an upstream side where the processing liquid circulates in a horizontal direction.   The supply section is provided with a relief valve for limiting the treatment liquid supply pressure to the treatment liquid supply section, and a return path for circulating the return liquid from the relief valve to the treatment liquid tank is connected to the relief valve. 5. The processing liquid purification apparatus according to claim 1, wherein an opening of the return path is opened toward a downstream side in which the processing liquid circulates in a horizontal direction.

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