WO2016143516A1

WO2016143516A1 - Liquid purification system

Info

Publication number: WO2016143516A1
Application number: PCT/JP2016/055427
Authority: WO
Inventors: 山田　正良
Original assignee: 株式会社日進製作所
Priority date: 2015-03-10
Filing date: 2016-02-24
Publication date: 2016-09-15
Also published as: JP2016165775A; JP6113771B2

Abstract

The purpose of the present invention is to provide a small-size liquid purification system that makes a sludge-containing liquid discharged from a cyclone-type filtering device into easy-to-handle and solidified briquette-like sludge, and that collects sludge which is resistant to centrifuging with the cyclone-type filtering device and makes such sludge into easy-to-handle and solidified briquette-like sludge. This liquid purification system is characterized by being provided with the following: a filter device 10 in which sludge contained in a liquid which was introduced into a swirl container 13 is centrifuged by generating a swirl flow in the liquid, the liquid from which the sludge was removed by the centrifuging is caused to flow out from the swirl container 13, and sludge-containing liquid which was separated by the centrifuging is discharged from the swirl container 13; a freely openable and closeable adjustment valve 20 that is provided on the downstream side of the filter device 10 and that adjusts the flow rate of the sludge-containing liquid discharged from the swirl container 13; and a deliquifying and solidifying device 30 that includes a filter body 34 to which the sludge-containing liquid is introduced via the adjustment valve 20, which allows the liquid in the sludge-containing liquid to pass therethrough, and which collects the sludge in the sludge-containing liquid, and the deliquifying and solidifying device deliquifies, by a compressing action, the liquid component of liquid-containing sludge which has collected above the filter body, and forms a solidified briquette-like sludge.

Description

Liquid purification system

The present invention relates to a liquid purification system for purifying a liquid such as a coolant supplied to a machine tool.

In general, a machine tool such as a honing machine or a grinding machine processes a workpiece (workpiece) disposed in a processing section while supplying coolant such as grinding fluid or cutting fluid. And the grinding | polishing waste, cutting waste, etc. of the workpiece | work which generate | occur | produce in the case of a process are collect | recovered with coolant. The collected used coolant is reused after being filtered by a filter device to remove objects to be removed such as grinding scraps and cutting scraps.

An example of a filter device that filters a removal target from a used coolant is disclosed in Patent Document 1.
This filter device is a cyclone type filter device, provided at the lower end of the conical portion, a processing vessel having a cylindrical portion at the top and a conical portion at the bottom, an introduction pipe for introducing used coolant to the cylindrical portion, A discharge port for discharging the object to be removed and an outflow pipe which is provided at the upper part of the cylindrical portion and flows out the coolant are provided.

This filter device introduces used coolant in the tangential direction of the cylindrical portion through the introduction pipe, and rotates the coolant on the inner peripheral surface of the processing vessel, thereby centrifuging the object to be removed outward in the radial direction. Then, the purged coolant from which the removal target has been removed is caused to flow out from the outflow pipe while the removal target moving downward due to gravity is discharged from the discharge port. Since the removal target discharged from the discharge port is discharged together with the coolant, it is discharged as a highly fluid liquid containing the removal target.

The cyclone type filter device as described above has a problem that when the specific gravity of the removal object becomes light or the particle size becomes small, the ability to centrifuge and discharge the removal object also decreases. Moreover, the handling of the highly fluid liquid containing the removal target discharged from the cyclone type filter device is an issue in the industry.

In the following description of the present specification, “sludge” refers to a solid material such as grinding powder or cutting waste generated in a machine tool, or a solid material that contains a liquid and is muddy. “Liquid-containing sludge” refers to sludge that contains liquid but is difficult to flow. Furthermore, the “sludge-containing liquid” refers to a liquid in which sludge is mixed and easily flows.

On the other hand, by introducing sludge-containing liquid into a pressurized container and using compressed air and a filter body, the liquid components are effectively separated and drained, and the briquette is solidified to a hardness that is easy to handle Patent Document 2 discloses a liquid removal and solidification method and apparatus for making sludge.

The liquid removal / solidification method as described above is industrially useful, but the apparatus is large and downsizing is desired. Moreover, not only the used coolant is converted into a sludge-containing liquid having a high sludge concentration by the cyclone type filter device, but also the sludge containing liquid discharged from the cyclone type filter device is converted into liquid-containing sludge, and further solidified briquette sludge. There is a need to.

JP 2003-210908 A JP 2010-279860 A

The present invention converts the sludge-containing liquid discharged from the cyclone type filter device into a solidified briquette sludge that is easy to handle, and also collects sludge that is difficult to centrifuge in the cyclone type filter device and facilitates handling. An object of the present invention is to provide a small-sized liquid purification system for producing a solidified briquette sludge.

(1) In the liquid purification system according to the first aspect of the present invention, a swirl flow is generated in the liquid introduced into the swirl container to centrifuge the sludge contained in the liquid, and the sludge is removed by the centrifuge. A filter device for causing the liquid to flow out of the swirl vessel and discharging the sludge-containing liquid separated by the centrifugal separation from the swirl vessel, and the sludge provided on the downstream side of the filter device and discharged from the swirl vessel An openable / closable control valve for adjusting the flow rate of the contained liquid, and introducing the sludge-containing liquid through the control valve, allowing the liquid in the sludge-containing liquid to pass therethrough and depositing the sludge in the sludge-containing liquid. It has a filter body, the liquid component of the liquid-containing sludge deposited on the filter body is drained by a pressing action, and solidified briquette sludge That it is characterized in that comprises a draining-solidifying device.

According to the present invention having the above configuration, since the control valve is provided between the filter device and the liquid removal / solidification device, the control device is discharged from the filter device by controlling the valve opening degree. The discharge flow rate of the sludge-containing liquid, that is, the introduction flow rate of the sludge-containing liquid introduced into the liquid removal / solidification apparatus, and the sludge concentration can be adjusted.

(2) In the configuration of (1), the liquid removal / solidification device has a discharge port at a lower end, a pressurized container into which the sludge-containing liquid is introduced, a lid body provided with the filter body, Opening and closing means for moving the lid to open and close the discharge port; and sweeping means for removing the liquid component of the liquid-containing sludge accumulated on the filter body by squeezing and sweeping the solidified briquette sludge It is characterized by having.

According to the present invention having the above-described configuration, the dewatering / solidifying device includes a pressurized container having a discharge port at a lower end, a lid provided with a filter body, and the discharge port by moving the lid. Open and close means for opening and closing, and sweeping means for draining the liquid component of the liquid-containing sludge accumulated on the filter body by squeezing action and sweeping out the solidified briquette sludge. The briquette sludge drained and solidified with can be easily swept out.

(3) In the configuration of (2), the opening / closing means is an annular cylinder device formed of an outer cylinder and an inner cylinder having an axial center in the vertical direction, and the control valve includes: It arrange | positions in the said inner cylinder of the said annular cylinder apparatus. According to this configuration, the liquid purification system can be reduced in size.

(4) In the configuration of (3), the swivel container of the filter device is disposed on the control valve such that the axis of the swirl container and the axis of the control valve overlap. According to this configuration, the liquid purification system can be further downsized. Further, since the flow path from the filter device to the liquid removal / solidification device via the control valve is a straight line, the flow path is not easily blocked by sludge.

(5) In the configurations of (1) to (4), the filter device includes a concentration detector that detects a sludge concentration in the sludge-containing liquid discharged from the filter device. . According to this configuration, the sludge-containing liquid having an appropriate sludge concentration in accordance with the operation state of the liquid removal / solidification device is introduced into the liquid removal / solidification device based on the detection signal of the concentration detector. The timing for opening the control valve can be optimized.

(6) In the above configurations (1) to (5), the dewatering / solidifying device detects the height of the liquid-containing sludge accumulated on the filter body and the height of the solidified sludge. It is characterized by having a vessel. According to this configuration, the detection signal of the height detector closes the control valve to squeeze the liquid-containing sludge accumulated on the filter body of the liquid removal and solidification device, and the liquid removal of the solidified sludge. -The timing of discharging from the solidification device can be optimized.

(7) In the liquid purification system according to the second aspect of the present invention, in the configurations of (1) to (6), the pressurized container is closed with the lid by the opening / closing means of the liquid removal / solidification device. In this state, the sludge-containing liquid discharged from the filter device is intermittently introduced into the liquid removal and solidification device by repeating the full opening for a short time after the control valve is fully closed. It is said.

As the filter body in the liquid removal / solidification apparatus, a filter body whose mesh size is slightly larger than the average particle diameter of the sludge is selected. In a filter body having an opening smaller than the average particle size of sludge, the filter body is easily clogged with sludge. On the other hand, in a filter body having an opening larger than the average particle diameter of sludge, the sludge passes through the filter body and is difficult to deposit on the filter body. However, when the sludge concentration is increased, the probability that a plurality of sludges move and accumulate on the filter body at the same time increases. Therefore, it is preferable that the sludge concentration is high in the initial stage where the sludge is deposited on the filter body. Once the sludge is deposited on the filter body in the initial stage, that is, when the initial deposited layer is formed, the deposited liquid-containing sludge then plays the role of the filter, so that only the sludge that has been centrifuged in the sludge-containing liquid is used. In addition, sludge having a small particle diameter that is difficult to be centrifuged is deposited on the filter body regardless of the average particle diameter of the sludge.

When the control valve of the filter device is fully closed and operated, the centrifugally separated sludge settles down due to the gravitational action and accumulates between the lower portion of the filter device and the control valve. As a result, a sludge-containing liquid having a high sludge concentration is obtained. After that, when the regulating valve is fully opened for a short time and a sludge-containing liquid with a high sludge concentration is introduced from the filter device to the dewatering / solidifying device at once, even if the particle size of the sludge is smaller than the opening of the filter body, Sludge accumulates on the filter body in the liquid removal / solidification apparatus, and it becomes easy to form an initial deposition layer. As described above, once the initial deposited layer is formed, the deposited liquid-containing sludge then plays the role of a filter, so that not only the sludge separated by centrifugation in the sludge-containing liquid but also the centrifugal Sludge having a small particle diameter that is difficult to separate, that is, deposits on the filter body regardless of the average particle diameter of the sludge.

(8) In the liquid purification system according to the third aspect of the present invention, in the configurations (1) to (6), the pressurized container is closed with the lid by the opening / closing means of the liquid removal / solidification device. In this state, after the control valve is fully closed, the sludge-containing liquid discharged from the filter device is continuously introduced into the liquid removal / solidification device by opening the control valve for a short time and then opening the latter half. It is characterized by.

As described above, once the initial deposition layer is formed by full opening for a short time after the control valve is fully closed, the sludge easily deposits on the filter body regardless of the average particle diameter or concentration of the sludge. After that, when the control valve is half-opened, not only the sludge that has been centrifuged in the sludge-containing liquid but also sludge with a small particle size that is difficult to centrifuge is introduced into the liquid removal and solidification device and deposited on the filter body. To do. Therefore, the filtration capability of the liquid purification system of the present invention in which the control device is controlled to open and close to operate the filter device and the liquid removal / solidification device in conjunction with each other is higher than the filtration capability of the filter device alone.

According to the present invention, by controlling the valve opening of the control valve, (1) the sludge-containing liquid including not only the sludge centrifuged by the filter device but also the sludge not centrifuged is discharged from the filter device and drained. -It can be introduced into the solidification device, (2) The initial deposition layer can be easily formed on the filter body of the liquid removal / solidification device, and (3) Sludge that is not centrifuged as well as sludge that is centrifuged by the filter device It is also possible to provide a small liquid purification system that can be solidified into a briquette shape.

1 is a schematic configuration diagram of a liquid purification system according to a first embodiment of the present invention. FIG. 2 is a cross-sectional explanatory view showing an operation state of a control valve of the liquid purification system shown in FIG. 1. FIG. 2 is a cross-sectional explanatory view showing the operation of the liquid removal / solidification device of the liquid purification system shown in FIG. 1. It is a timing chart which shows the valve opening degree of a control valve in the intermittent accumulation mode, and the accumulation height of sludge. It is a timing chart which shows the valve opening degree of a control valve in the continuous accumulation mode, and the accumulation height of sludge. It is sectional explanatory drawing which shows the 2nd Embodiment of this invention.

<First Embodiment>
[overall structure]
FIG. 1 is a schematic configuration diagram of a liquid purification system according to the first embodiment of the present invention.
The liquid purification system of the present embodiment is a system for purifying coolant (a fluid to be treated) used in a machine tool (sludge generator) 1 such as a honing machine. The liquid purification system includes a filter device (cyclonic sludge separation device) 10, a control valve 20, a liquid removal and solidification device 30, a supply tank 2, a pump 3, a compressed air source (not shown), And a control unit (not shown).

In FIG. 1, piping from the supply tank 2 to the filter device via the pump 3, piping from the filter device 10 to the machine tool 1, piping from the machine tool 1 to the supply tank 2, and a swivel container 13. The piping from the discharge port 13c to the control valve 20 and the piping from the control valve 20 to the liquid removal / solidification device 30 are not shown, and only the flow of the coolant is represented by →.

The supply tank 2 is used for storing coolant to be supplied to the machine tool 1 that performs grinding and cutting. The supply tank stores not only unused coolant but also used coolant after being used in the machine tool 1. The pump 3 sucks up the coolant in the supply tank 2 and supplies it to the filter device 10. The filter device 10 removes solids (sludge) such as grinding waste and cutting waste contained in the coolant. The coolant from which the sludge has been removed is supplied to the machine tool 1 and then returned to the supply tank 2 again.

The filter device 10 includes an introduction pipe 11, an outflow pipe 12, and a swivel container 13.

The swirl container 13 includes a swivel part 13a and a sedimentation part 13b. The turning part 13a has a side wall formed in a cylindrical shape and a top wall provided at the top of the side wall, and is open downward. An introduction port 11a is provided on the side wall of the turning portion 13a, and the introduction pipe 11 is connected thereto. Moreover, the outflow pipe 12 is provided in the top wall of the turning part 13a. A settling portion 13b is connected to the open lower portion of the turning portion 13a. The side wall of the settling portion 13b is formed in a conical shape or a cylindrical shape, and a discharge port 13c is provided in the lower portion thereof. The turning part 13a and the settling part 13b are arranged in a state where the central axis (cylinder axis) O1 of each side wall is vertical.

The introduction pipe 11 is arranged along the tangential direction of the side wall formed in the cylindrical shape of the swivel container 13. Coolant pumped from the supply tank 2 by the pump 3 is supplied to the introduction pipe 11. And the coolant introduce | transduced in the turning container 13 from the inlet 11a via the inlet pipe 11 turns in the circumferential direction along the internal peripheral surface of the side wall of the turning container 13 (refer dotted line arrow S). Therefore, the sludge contained in the coolant moves to the outside in the radial direction by the centrifugal force due to the turning and is separated from the coolant. Further, the sludge moves downward by gravity, and is discharged from the discharge port 13c of the swirl container 13 as a sludge-containing liquid together with a part of the coolant.

The outflow pipe 12 is formed in a cylindrical shape, and is arranged in a state where its central axis coincides with the central axis O1 of the side wall of the swirl vessel 13. The outflow pipe 12 penetrates the top wall of the swivel part 13a up and down, and projects upward and downward from the top wall. Therefore, the swivel part 13a has a double cylinder structure by the side wall and the outflow pipe 12. The coolant is supplied to the machine tool 1 through the outflow pipe 12 after the sludge is centrifuged by the centrifugal force generated by the swirling flow in the swirling container 13.

Part of the sludge and coolant (hereinafter referred to as sludge-containing liquid) discharged from the discharge port 13 c of the settling portion 13 b is guided to the liquid removal / solidification device 30 via the control valve 20.

The filter device 10 preferably includes a concentration detector 15. The concentration detector 15 detects the concentration of sludge in the sedimentation portion 13b. Specifically, the concentration detector 15 includes a light source unit 15a and a light detection unit 15b, and is provided on the wall of the sedimentation unit 13b in the horizontal direction. For example, the light source unit 15a is a laser or the like, the light emitted from the light source unit 15a is transmitted through the sedimentation unit 13b, and the transmitted light that is transmitted is detected by the light detection unit 15b. The amount of transmitted light detected by the light detection unit 15b decreases more when the concentration of sludge in the sludge-containing liquid is high. Therefore, it can be set as the structure which detects the density | concentration of sludge by measuring the decreasing rate of the transmitted light amount. The output signal of the concentration detector 15 is input to a control unit (not shown).

The control valve 20 includes an inner cylinder 21 and an outer cylinder 22 formed in a cylindrical shape, and an upper plate 23 and a lower plate 24 formed in a disk shape. The inner cylinder 21, the outer cylinder 22, the upper plate 23, and the lower plate 24 form an annular sealed air chamber 26. A compressed air introduction tube 25 is inserted into the outer cylinder 22. The upper plate 23 has an opening and is connected to the discharge port 13c of the filter device 10 by piping (not shown). The lower plate 24 has an opening, and is connected to the inlet 31a of the sedimentation container 31 of the liquid removal / solidification device 30 by piping (not shown). It is more preferable that the upper plate 23 and the lower plate 24 have a convex shape and the convex portion is fitted and inserted into the inner cylinder 21.

The inner cylinder 21 has flexibility, and as shown in FIG. 2, it can close the flow path of sludge containing liquid by compressing in radial direction with the compressed air introduced into the air chamber 26. it can. That is, the inner cylinder 21 itself can be used as an on-off valve, and can also be (a) fully open, (b) half open, and (c) fully closed by adjusting the pressure of compressed air. Acts as a regulating valve. Here, the half-open state does not mean a half valve opening degree of the full-open state, but means an intermediate state between full-open and full-closed, and the valve opening degree does not matter. The control valve 20 may be, for example, controlled by electromagnetic force other than the valve opening controlled by air pressure as described above.

When the control valve 20 is closed, the outflow of the sludge-containing liquid from the filter device 10 stops, and the sludge settles and stays in the flow path between the lower part of the settling portion 13b and the control valve 20, and the sludge Increase the concentration of sludge in the contained liquid. When the control valve 20 is opened, the sludge-containing liquid flows out of the filter device 10 according to the valve opening of the control valve 20 and is introduced into the liquid removal / solidification device 30.

FIG. 3 is an explanatory cross-sectional view illustrating the configuration and operation of the liquid removal / solidification apparatus 30. The liquid removal / solidification apparatus 30 includes a pressurized container 31, a compressed air introduction pipe 32, a lid 33, an opening / closing means 38, and a sweeping means 39.

The pressurization container 31 has a side wall formed in a cylindrical shape and a top wall provided at the top of the side wall, and is open downward. The top wall of the pressurized container 31 has an inlet 31 a for introducing the sludge-containing liquid discharged from the filter device 10 through the control valve 20. The introduction port 31a may be provided on the side wall of the pressurized container 31. The introduction port 31a is connected to the control valve 20 by piping (not shown). A compressed air introduction pipe 32 for introducing compressed air is inserted into the pressurized container 31. The compressed air introduction pipe 32 is connected to a compressed air source (not shown) through a valve (not shown).

The lid 33 has a liquid discharge port 33a. The liquid discharge port 33a is provided with a filter body 34 having a filtration function. The filter body 34 is composed of a wire mesh or the like corresponding to the average particle diameter of solid matter (sludge) such as grinding powder and cutting waste generated in the machine tool. The liquid discharge port 33a is provided in the upper part of the supply tank 2, or is connected to the supply tank 2 by piping.

The opening / closing means 38 (see FIG. 3c) determines the relative position between the pressurized container 31 and the lid 33, and is constituted by an air cylinder or the like. When the sealing means (see FIGS. 3 a and 3 b) is opened by the opening / closing means 38, the pressurized container 31 and the lid 33 are deposited on the filter body 34 after the sludge-containing liquid has passed through the filter body 34. A pressure space 36 is formed in which a liquid component is squeezed and solidified from the liquid-containing sludge to perform a pressurizing step for forming a briquette sludge having a predetermined shape. The pressurizing space 36 communicates with the external space (atmosphere) through the filter body 34. On the other hand, when in the open position (see FIGS. 3c and 3d), the pressurizing space 36 is opened.

The sweeping means 39 (see FIG. 3d) sweeps sludge solidified into a predetermined briquette shape from the pressurizing space 36 when the pressurizing space 36 is in the open position, and is constituted by an air cylinder or the like. The

The liquid removal / solidification device 30 preferably includes a height detector 35 that detects the height of the liquid-containing sludge deposited on the filter body 34 and the height of the liquid removal / solidification sludge. Specifically, the height detector 35 is inserted from the top wall of the pressurized container 31 and is provided in a downward hanging manner. The height detector 35 detects the height by contacting with liquid-containing sludge or solidified sludge. To do. Note that the height detector 35 may be inserted from the side wall of the pressurized container 31 and provided in a downward hanging manner. For example, the height detector 35 may be an electrode rod, and the height may be detected by a change in voltage or current when liquid-containing sludge or solidified sludge contacts the electrode rod. The height detector 35 may be an ultrasonic sensor or an optical sensor. In this case, the height can be detected even if the sludge is not made of metal processing waste. Further, the height detector 35 is omitted, and the height of the liquid-containing sludge accumulated on the filter body 34 is indirectly detected based on the sludge concentration of the sludge-containing liquid introduced from the filter device 10 or the number of introductions. You can also. The detection signal of the height detector 35 is input to a control unit (not shown).

[Overall operation of liquid purification system]
Next, the operation of the liquid purification system according to this embodiment will be described. As shown in FIG. 2, the control valve 20 has three types of states: (a) a fully open state, (b) a half open state, and (c) a fully closed state. Here, the half-open state does not mean a valve opening that is half that of the fully-open state, but means an intermediate state between full-open and fully-closed, and the valve opening of the control valve does not matter.

As for the operation of the liquid removal / solidification apparatus 30, four types of operation modes, that is, (a) a deposition mode and (b) a compression mode in which the pressurizing space 36 is sealed by the opening / closing means 38 as shown in FIG. There are (c) open mode and (d) sweep mode in which the pressurizing space 36 is opened by the opening / closing means 38.

4 and 5 are time charts showing the operation of the liquid purification system. The height of the liquid-containing sludge accumulated on the filter body 34 or the height of the solidified sludge according to the valve opening degree of the regulating valve. The time change of is shown. In the accumulation mode, the valve opening degree of the control valve 20 is controlled in a state where the pressurizing space 36 is sealed by the opening / closing means 38.

As a typical deposition mode, as shown in FIG. 4, (1) a fully closed state and (2) an intermittent deposition mode in which a short time fully opened state is repeated intermittently, and (2) as shown in FIG. (3) There is a continuous deposition mode that keeps the half-open state after a short full-open state. In any of the deposition modes, the operation may be performed with the fully open state being the half open state.

When the height of the liquid-containing sludge accumulated on the filter body 34 reaches a predetermined value, the intermittent accumulation mode is ended by fully closing the control valve 20, and (4) pressing mode, (5) opening mode, ( 6) Transition to sweep mode. Since the control valve 20 is fully closed during these modes, (6) after the end of the sweep mode, the transition to the deposition mode is completed again while forming a part of the deposition mode. In this intermittent accumulation mode, whenever the control valve 20 is in the fully closed state, compressed air may be sent to the pressurized space 36 to squeeze the liquid-containing sludge accumulated on the filter body 34. That is, the accumulation mode and the squeezing mode are performed in a time-sharing manner, and when the sludge solidified by the squeezing reaches a predetermined value, the control valve 20 is fully closed, (5) open mode, (6) sweeping Transition to mode. During these modes, since the control valve 20 is in a fully closed state, (6) the transition to the deposition mode is completed again after the end of the sweep mode while forming a part of the deposition mode.

In the intermittent accumulation mode, the control valve 20 is set to the fully closed state and the fully open state until the height of the liquid-containing sludge accumulated on the filter body 34 or the height of the solidified sludge reaches a predetermined value. repeat. During this time, sludge having a small particle diameter that is difficult to be centrifuged in the filter device 10 is hardly introduced into the liquid removal / solidification device 30 and does not accumulate much on the filter body 34.

In the continuous accumulation mode, the control valve 20 is fully opened for a short time, and then the control valve 20 is fully closed when the accumulation height of the liquid-containing sludge accumulated on the filter body 34 reaches a predetermined value. And (4) pressing mode, (5) opening mode, and (6) sweeping mode. During these modes, since the control valve 20 is in a fully closed state, (6) the transition to the deposition mode is completed again after the end of the sweep mode while forming a part of the deposition mode.

In the continuous deposition mode, when the control valve 20 is fully closed, the sludge is centrifuged in the swirl vessel 13 and settled by the action of gravity, and accumulated between the lower part of the filter device 10 and the control valve 20 to form the sludge. When a sludge-containing liquid with a high concentration is formed, and the control valve 20 is fully opened for a short time and the sludge-containing liquid with a high concentration of sludge is introduced into the liquid removal and solidification device 30 at once, the initial sludge is formed on the filter body 34. In the semi-opened state after the deposition layer is formed, not only the sludge having a large particle diameter that is easily centrifuged, but also the sludge having a small particle diameter that is difficult to be centrifuged is loaded on the flow rate of the sludge-containing liquid discharged from the filter device 10. Then, it is introduced into the liquid removal / solidification device 30. In addition to the filtering function of the filter body 34, the initial deposited layer of sludge deposited on the filter body 34 also has a filtering function (cake effect), so that sludge having a large particle diameter introduced into the liquid removal and solidification device 30 is also small sludge. Is also deposited on the filter body 34.

In any of the deposition modes, when the height detector 35 reaches a predetermined value, the control unit fully closes the control valve 20 and then ends the deposition mode to shift to the next mode. When the liquid removal / solidification device 30 does not include a height detector, the control unit waits for a predetermined time, ends the deposition mode, and shifts to the next mode.

In the compression mode, the control unit sends compressed air from the compressed air source to the pressurized space 36 via the compressed air introduction pipe 32. Since the pressurized space 36 communicates with the external space (atmosphere) through the filter body 34, the liquid content in the liquid-containing sludge is squeezed. On the other hand, the squeezed liquid-containing sludge is solidified into a briquette shape with a small amount of liquid on the filter body 34. The control unit waits for a predetermined squeezing time and shifts the liquid removal / solidification device 30 from the squeezing mode to the open mode.

In the open mode, the control unit opens the pressurizing space 36 by the opening / closing means 38. After opening the pressurizing space 36, the control unit shifts the liquid removal / solidification device 30 from the open mode to the sweep mode.

In the sweep mode, the control unit causes the sweep means 39 to discharge the briquette sludge that has been drained and solidified on the filter body 34 in the horizontal direction and discharge the briquette sludge from the draining and solidifying device 30. After the discharge of briquette sludge is completed, the control unit seals the pressurizing space 36 by the opening / closing means 38 and shifts from the sweep mode to the deposition mode again. Thereafter, the control unit repeats the accumulation mode, the squeezing mode, the release mode, and the sweep mode.

If the liquid purification system of the present embodiment is operated in the continuous deposition mode, small removal objects exceeding the centrifugal separation capability of the filter device are also collected by the liquid removal / solidification device 30. The filtration performance can be improved.

<Second Embodiment>
FIG. 6 is a cross-sectional explanatory view of a liquid purification system according to the second embodiment of the present invention.
As in the first embodiment, the liquid purification system of the present embodiment includes a filter device (cyclonic sludge separation device) 10, a control valve 20, a liquid removal / solidification device 30, and a supply tank (not shown). A pump (not shown), a compressed air source (not shown), and a control unit (not shown).

The liquid purification system according to the present embodiment has a configuration in which the piping from the filter device 10 to the control valve 20 and the piping from the control valve 20 to the liquid removal / solidification device 30 are omitted. And the liquid removal / solidification device 30 are integrated with each other, which is different from the first embodiment. Further, the opening / closing means 38 is constituted by an air cylinder device, and is different from the first embodiment in that an opening plate 48 interlocked with the opening / closing means 38 is provided. About the liquid purification system of this embodiment, the different point from 1st Embodiment is demonstrated below with sectional explanatory drawing of FIG.

The opening / closing means 38 of the liquid removal / solidification device 30 is constituted by an air cylinder device. Specifically, a cylinder body 40 and a piston 41 are provided. The cylinder body 40 and the pressurized container 31 are connected to the upper part of the pressurized container 31 with the same axial center. The introduction port 31 a is provided at the upper part of the pressurized container 31 with the same axis.

The cylinder body 40 includes an outer cylinder 42, an inner cylinder 43 (22), an upper plate 44, and a lower plate 45. The outer cylinder 42 is formed in a cylindrical shape having a vertical axis, and the upper end and the lower end are open.
The inner cylinder 43 (22) is also formed in a cylindrical shape having a vertical axis, and the upper end and the lower end are open. The inner cylinder 43 (22) has an outer diameter smaller than that of the outer cylinder 42, and is disposed concentrically with the outer cylinder 42 inside the outer cylinder 42. The upper plate 44 is formed in a disk shape and is connected to the upper ends of the outer cylinder 42 and the inner cylinder 43 (22). The lower plate 45 is also formed in a disk shape and is connected to the lower ends of the outer cylinder 42 and the inner cylinder 43 (22). An inner cylinder 43 (22) is disposed in an opening provided in the center of the upper plate 44 and the lower plate 45.

The upper plate 44 and the lower plate 45 are respectively provided with

supply ports

40a and 40b to which working air for sliding the annular piston 41 up and down is supplied. A compressed air source (not shown) is connected to each

supply port

40a, 40b via a pipe (not shown). The piping is provided with a switching valve (not shown), and compressed air is switched and supplied to the

supply ports

40a and 40b.

The piston 41 is disposed inside the cylinder body 40 and is formed in a ring shape having an outer diameter slightly smaller than the outer cylinder 42 and an outer diameter slightly larger than the inner cylinder 43. The piston 41 divides the inside of the cylinder body 40 into an upper space and a lower space, and slides in the vertical direction. A seal member (not shown) is provided on the outer peripheral surface and inner peripheral surface of the piston 41 to maintain a sealing property between the inner peripheral surface of the outer tube 42 and the outer peripheral surface of the inner tube 43.
The upper ends of two sets of support rods (support members) 46 and 47 are attached to the lower surface of the piston 41. The

support rods

46 and 47 are arranged along the vertical direction, and slidably penetrate the lower plate 45. The lower end of the support rod 46 is connected to the lid 33, and the lower end of the support rod 47 is connected to the extrusion plate 48.

The extrusion plate 48 has a large number of through holes. The sludge-containing liquid introduced from the inlet 31 a of the pressure vessel 31 collides with the extrusion plate 48 and then passes through the through hole of the extrusion plate 48 or the clearance between the extrusion plate and the pressure vessel 31 and onto the filter body 34. Fall. The sludge-containing liquid is diffused in the horizontal direction by colliding with the extrusion plate 48, and uniformly falls on the filter body 34. Therefore, since the liquid-containing sludge is uniformly deposited on the filter body 34, it is possible to reduce the possibility that the compressed air escapes from a part of the filter body 34 in the compression mode.

With the above configuration, when the piston 41 moves up and down by the compressed air supplied into the cylinder body 40 from the

supply ports

40a and 40b, the lid 33 and the extrusion plate 48 also move up and down via the

support rods

46 and 47. . When the piston 41 is moved upward, the pressurized space 36 of the pressurized container 31 is sealed. On the other hand, when the piston 41 is moved downward, the pressurization space 36 of the pressurization container 31 is opened, and briquette sludge solidified by the squeezing action in the pressurization space 36 is compressed by the extrusion plate 48. It is reliably extruded from 31.

The inner cylinder 43 (22) disposed at the center of the cylindrical cylinder body 40 also serves as the outer cylinder 22 of the control valve 20. A flexible inner cylinder 21 and a lower plate 24 are inserted into the inner cylinder 43 (22). Furthermore, the upper plate 23 is connected to the upper part of the inner cylinder 43 (22). The upper plate 23, the lower plate 24, the inner cylinder 21, and the inner cylinder 43 (22) form an annular sealed air chamber 26. The upper plate 23 has a compressed air introduction pipe 25 inserted therein, and is provided with a hole for supplying compressed air to the air chamber 26 via the compressed air introduction pipe 25. Therefore, the upper plate 23, the lower plate 24, the inner cylinder 21, and the inner cylinder 43 (22) constitute the control valve 20 similar to that of the first embodiment. It is more preferable that the upper plate 23 and the lower plate 24 have a convex shape and the convex portion is fitted and inserted into the inner cylinder 21.

With the above configuration, the air cylinder main body 40 and the pressurized container 31 which are the opening / closing means 38 of the liquid removal / solidification device 30 are integrated with the control valve, and the control valve 20 and the liquid removal solidification device 30 are connected. This eliminates the need for piping, and enables downsizing. In addition, the upper plate 23 and the lower plate 24 are connected by a rod or the like, and the upper plate 23, the lower plate 24, and the inner cylinder 21 are integrated and detachable so that they can be inserted into the inner cylinder 43 (22). More preferred. In this way, maintenance of the control valve 20 is facilitated.

Furthermore, if the swivel container 13 of the filter device 10 is directly connected to the upper plate 23 of the control valve 20 with the same axis, the piping for connecting the filter device 10 and the control valve 20 is not necessary. Further downsizing is possible. Further, since the flow path from the filter device 10 to the liquid removal / solidification device 30 via the control valve 20 can be straightened, the flow path is not easily blocked by sludge.

The air cylinder device 40 constituting the opening / closing means 38 is disposed above the pressurized container 31. In the prior art (see Patent Document 2), since the air cylinder device that opens and closes the lid is disposed below the pressurized container, the air cylinder device is protected from being contaminated by the liquid discharged from the pressurized container. Although necessary, in the present embodiment, such measures are unnecessary.

The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the invention described in the claims. For example, in the above embodiment, the purified coolant flowing out from the outflow pipe 12 of the filter device 10 is directly supplied to the machine tool 1, but after the purified coolant is once returned to the supply tank 2, other pumps are turned on. It may be used to supply the machine tool 1 from the supply tank 2.

In the above embodiment, the filter device 10 has only one swirl container 13. However, the filter device 10 may be composed of a plurality of swirl containers. Moreover, it may be a filter device that has a plurality of swivel portions and that has a plurality of introduction pipes, outflow pipes, and discharge ports connected to them. Furthermore, other types of filter devices may be used.
In addition, the liquid purification system of the present invention can be used not only for sludge generated by a machine tool, but also for draining and solidifying sludge generated for other reasons.

This international application claims priority based on Japanese Patent Application No. 2015-046749 which is a Japanese patent application filed on March 10, 2015, and Japanese Patent Application No. 2015-046749 which is the Japanese patent application. The entire contents of the issue are incorporated into this international application.

The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration. They are not intended to be exhaustive or to limit the invention to the precise form described. It will be apparent to those skilled in the art that many modifications and variations are possible in light of the above description.

1: Machine tool (sludge generator)
2: Supply tank 3: Pump 10: Filter device (cyclone sludge separator)
11: Introduction pipe 12: Outflow pipe 13: Swivel container 15: Concentration detector 20: Control valve 30: Liquid removal / solidification device 31: Pressurized container 32: Compressed air introduction pipe 33: Lid 34: Filter body 35: Height detector 38: Opening / closing means 39: Sweeping means

Claims

A swirl flow is generated in the liquid introduced into the swirl container, the sludge contained in the liquid is centrifuged, and the liquid from which the sludge has been removed by the centrifugal separation is caused to flow out of the swirl container and separated by the centrifugal separation. A filter device that discharges the sludge-containing liquid from the swirl vessel, a control valve that is provided on the downstream side of the filter device and that can be opened and closed to adjust the flow rate of the sludge-containing liquid discharged from the swirl vessel; A liquid-containing sludge having a filter body for introducing the sludge-containing liquid through a valve, allowing the liquid in the sludge-containing liquid to pass therethrough and depositing the sludge in the sludge-containing liquid, and depositing on the filter body A liquid removal and solidification device for dewatering the liquid component of the product by pressing and converting it into a solidified briquette sludge. Fluid purification system.
The dewatering / solidifying apparatus has a discharge port at a lower end, a pressurized container into which the sludge-containing liquid is introduced, a lid body provided with the filter body, and the discharge body by moving the lid body And an open / close means for opening and closing the liquid component of the liquid-containing sludge accumulated on the filter body by a squeezing action, and a sweeping means for sweeping out the solidified briquette sludge. The liquid purification system according to claim 1.
The opening / closing means is an annular cylinder device having an outer cylinder having an axial center in the vertical direction and an inner cylinder, and the control valve is disposed in the inner cylinder of the annular cylinder device. The liquid purification system according to claim 2, which is disposed in
The liquid purifying system according to claim 3, wherein the swirl container of the filter device is disposed on the control valve such that an axis of the swirl container and an axis of the control valve overlap each other.
The liquid according to any one of claims 1 to 4, wherein the filter device includes a concentration detector that detects a concentration of sludge in the sludge-containing liquid discharged from the filter device. Purification system.
The liquid removal / solidification device includes a height detector that detects a height of the liquid-containing sludge accumulated on the filter body and a height of the solidified sludge. 6. The liquid purification system according to any one of 5 above.
When the pressure vessel is closed by the lid by the opening / closing means of the liquid removal / solidification device, the control valve is fully closed and then repeatedly fully opened for a short time, thereby being discharged from the filter device. The liquid purification system according to any one of claims 1 to 6, wherein the sludge-containing liquid is intermittently introduced into a liquid removal and solidification apparatus.
In a state where the pressure vessel is closed by the lid by the opening / closing means of the liquid removal / solidification device, the control valve is fully closed, and then fully opened for a short time, and then opened in the latter half thereof, from the filter device. The liquid purification system according to any one of claims 1 to 6, wherein the discharged sludge-containing liquid is continuously introduced into a liquid removal and solidification apparatus.