JP7235664B2 - Coolant liquid treatment system and float check valve - Google Patents

Description

The present invention relates to a coolant treatment system for removing sludge from a coolant containing sludge. The present invention also relates to a float type check valve for use in coolant treatment systems.

The coolant liquid supplied to the machine tool is mixed with impurities such as chips generated during machining as sludge. Sludge is removed from the coolant liquid containing sludge by filtration or the like. The treated coolant from which the sludge has been removed is reused as coolant for machine tools.
For example, Patent Literature 1 describes a coolant liquid treatment system that includes a dirty tank that stores a coolant liquid containing sludge and a clean tank that stores a coolant liquid filtered by a filter. A coolant liquid containing sludge discharged from a machine tool is temporarily stored in a dirty tank, sucked up from the dirty tank by a pump, and supplied to a filtering device.

JP 2014-111284 A

As described above, in the coolant liquid treatment system of Patent Document 1, the coolant liquid containing sludge is temporarily stored in the dirty tank, so the sludge accumulates on the bottom of the dirty tank. The deposited sludge is sucked up by a pipe with a suction port near the bottom of the dirty tank. However, sludge near the suction port of the pipe can be sucked up by the suction force of the pump, but sludge deposited far from the suction port of the pipe cannot be sucked up because the suction force of the pump does not reach it. There's a problem.

Accordingly, an object of the present invention is to provide a primary tank (dirty tank) for storing a coolant liquid containing sludge and a secondary tank (clean tank) for storing a treated coolant liquid obtained by removing sludge from the coolant liquid containing sludge. To prevent the sludge in the primary tank from flowing into the secondary tank while suppressing the accumulation of sludge on the bottom of the primary tank in a coolant liquid treatment system.

As a result of intensive studies on the above-mentioned problems, the present inventors have found that the primary tank and the secondary tank are communicated with each other through the liquid passage part, and the treated coolant liquid flows from the secondary tank to the primary tank, thereby It has been found that a flow of coolant liquid is established in the tank, and sludge build-up on the bottom of the primary tank can be suppressed. Furthermore, by providing the liquid passage part with a float type check valve that suppresses the inflow of the coolant liquid from the primary tank to the secondary tank, it is possible to suppress the sludge in the primary tank from flowing into the secondary tank. and completed the present invention.
That is, the present invention is a coolant liquid treatment system and a float type check valve used in the coolant liquid treatment system described below.

The coolant treatment system of the present invention for solving the above problems comprises a primary tank for storing a coolant containing sludge, and a secondary tank for storing a treated coolant obtained by removing the sludge from the coolant containing the sludge. and, the primary tank and the secondary tank are communicated through a liquid passage portion, and the liquid passage portion includes a float type reverse tank for restricting the flow from the primary tank to the secondary tank. A stop valve is provided.

According to this coolant liquid treatment system, since the primary tank and the secondary tank are communicated through the liquid passage part, the treated coolant liquid can flow from the secondary tank to the primary tank. As a result, a flow of coolant liquid is generated in the primary tank, and sludge deposition can be suppressed. Furthermore, according to this coolant treatment system, even if the amount of liquid in the primary tank decreases, the treated coolant is replenished from the secondary tank, so the size of the primary tank can be reduced. By reducing the size of the primary tank, the flow of the coolant liquid in the primary tank becomes stronger, so sludge deposition can be further suppressed.
Further, when the capacity of the primary tank is reduced, the liquid level in the primary tank tends to fluctuate. However, since the coolant liquid treatment system of the present invention is equipped with a float type check valve that restricts the inflow from the primary tank to the secondary tank, even if the amount of liquid in the primary tank increases, sludge will not flow into the secondary tank. contamination can be prevented.

One embodiment of the coolant treatment system of the present invention is characterized in that a plurality of primary tanks are provided.
According to this feature, by dividing the primary tank into a plurality of parts, it is possible to further reduce the capacity and bottom area of the primary tank, thereby further enhancing the effect of suppressing sludge deposition.

In one embodiment of the coolant treatment system of the present invention, the float type check valve includes a float having a specific gravity smaller than that of the coolant, and a storage section that stores the float, and the storage section includes the coolant liquid. has an inflow port through which the fluid flows in, and the float seals the inflow port.
According to this feature, the float directly acts as a plug for sealing the inlet, so the inlet can be quickly sealed with a simple structure. Therefore, there is an effect of being excellent in suppressing the mixing of sludge from the primary tank to the secondary tank.

The float type check valve used in the coolant liquid treatment system of the present invention for solving the above problems comprises a primary tank that stores a coolant liquid containing sludge and a treated coolant liquid that has been treated to remove sludge from the coolant liquid containing sludge A float type check valve for use in a coolant treatment system comprising a secondary tank for storing a coolant and a liquid passage portion communicating between the primary tank and the secondary tank, wherein the liquid passage portion is provided. and restricts the inflow from the primary tank to the secondary tank through the liquid passage part.
According to this float type check valve, by applying it to an existing coolant liquid treatment system, the coolant liquid treatment system of the present invention can be constructed.

According to the present invention, in a coolant liquid treatment system including a primary tank that stores a coolant liquid containing sludge and a secondary tank that stores a treated coolant liquid obtained by removing sludge from the coolant liquid containing sludge, the primary It is possible to prevent sludge in the primary tank from flowing into the secondary tank while suppressing sludge accumulation on the bottom of the tank.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which shows the structure of the coolant liquid processing system of 1st embodiment of this invention. FIG. 4 is a schematic explanatory diagram for explaining the operation of the float type check valve of the coolant liquid treatment system of the present invention; FIG. 4 is a schematic explanatory diagram showing the structure of another embodiment of the float type check valve of the coolant liquid treatment system of the present invention; FIG. 2 is a schematic explanatory diagram showing the structure of a coolant liquid treatment system according to a second embodiment of the present invention; FIG. 4 is a schematic explanatory diagram showing the structure of a coolant liquid treatment system according to a third embodiment of the present invention; FIG. 5 is a schematic explanatory diagram showing the arrangement of primary tanks, secondary tanks, and tertiary tanks of the coolant liquid treatment system according to the third embodiment of the present invention; FIG. 7 is a schematic explanatory diagram showing the structure of a coolant liquid treatment system according to a third embodiment of the present invention, viewed from the direction aa of FIG. 6; FIG. 7 is a schematic explanatory diagram showing the structure of a coolant liquid treatment system according to a third embodiment of the present invention, viewed from the bb direction of FIG. 6; FIG. 7 is a schematic explanatory diagram showing the structure of a coolant liquid treatment system according to a third embodiment of the present invention, viewed from the cc direction of FIG. 6;

The coolant liquid is lubricating oil, water, or the like used in processing machines for cutting, polishing, or the like, and may be either an aqueous liquid or an oily liquid. When the coolant is used for processing machines such as cutting and polishing, sludge such as chips generated by the processing such as cutting and polishing is mixed in the used coolant. A coolant liquid treatment system of the present invention is a system for removing sludge from a coolant liquid containing sludge such as chips. In particular, the coolant liquid treatment system of the present invention includes a primary tank that stores a coolant liquid containing sludge, and a secondary tank that stores the treated coolant liquid obtained by removing the sludge from the coolant liquid containing the sludge. In the coolant liquid treatment system, the primary tank and the secondary tank are in communication via a liquid passage, and the liquid passage restricts the inflow from the primary tank to the secondary tank. It is characterized by having a float type check valve.

BEST MODE FOR CARRYING OUT THE INVENTION Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
[Coolant treatment system]
FIG. 1 shows the structures of a coolant liquid treatment system 1A and a machine tool 100 according to the first embodiment of the present invention. Note that the machine tool 100 is a processing machine such as a grinding machine or a cutting machine that uses a coolant liquid, and generates chips and the like.
The coolant treatment system 1A of the present invention includes a pretreatment device 6 for reducing the amount of sludge in the used coolant discharged from the machine tool 100, and a coolant containing sludge discharged from the pretreatment device 6. A primary tank 2 for storage, a sludge removal device 7 for removing sludge from the coolant liquid stored in the primary tank 2, and a treated coolant liquid from which sludge has been removed by the sludge removal device 7 for storing with a secondary tank 3 of The primary tank 2 and the secondary tank 3 are configured by partitioning one tank 13 with a partition wall 14A and a partition wall 14B. The primary tank 2 and the secondary tank 3 are in communication with each other through a liquid passage portion 4 formed between the partition wall 14A and the partition wall 14B. The liquid passage part 4 is provided with a float type check valve 5 , and this float type check valve 5 restricts the inflow of the coolant liquid from the primary tank 2 to the secondary tank 3 .

<Primary tank>
The primary tank 2 is a tank for storing coolant liquid containing sludge discharged from the machine tool 100 . The used coolant liquid stored in the primary tank 2 is sucked up by the pump P1 provided in the flow path L3 and supplied to the sludge removing device 7 . The suction port of the flow path L3 is arranged near the bottom surface of the primary tank 2 so that the sludge accumulated in the primary tank 2 can be sucked. The outlet of the flow path L3 is connected to the sludge removing device 7. As shown in FIG. In order to widen the range of sucking deposited sludge, a plurality of flow paths L3 and pumps P1 may be provided, the flow path L3 may be branched to increase the number of suction ports, or the diameter of the suction ports may be enlarged.

The capacity of the primary tank 2 is not particularly limited, but for example, it may be 10 times or less, preferably 5 times or less, more preferably 3 times or less, the flow rate per minute of the pump P1. . By reducing the capacity of the primary tank 2 with respect to the flow rate per minute of the pump P1, when the pump P1 is operated, a strong flow is generated inside the primary tank 2, and the sludge deposited at the bottom is sufficiently sucked. be able to. When a plurality of flow paths L3 and pumps P1 are installed, the capacity of the primary tank 2 may be designed with respect to the total flow rate of the plurality of pumps P1.

Further, as one embodiment of the coolant liquid treatment system of the present invention, a plurality of primary tanks 2 may be provided, and each primary tank 2 may be provided with the flow path L3. By installing a plurality of primary tanks 2, a predetermined capacity of the primary tank 2 can be secured even if the capacity of each primary tank 2 is reduced. As a result, the effect of sucking up the sludge can be further enhanced without changing the flow rate per minute of the used coolant supplied to the sludge removing device 7 . The pump P1 for suction may be installed in each flow path L3 provided in a plurality of primary tanks, or may be installed in a flow path where each flow path L3 joins.

<Secondary tank>
The secondary tank 3 is a tank for storing the treated coolant liquid from which the sludge has been removed by the sludge removing device 7 . The treated coolant liquid stored in the secondary tank 3 is sucked up by the pump P2 provided in the flow path L5 and supplied to the machine tool 100 .

Between the partition wall 14A and the partition wall 14B that partition the secondary tank 3 and the primary tank 2, a liquid passage portion 4 that allows liquid to flow to the primary tank 2 is formed. The liquid passage part 4 includes a float type check valve 5 for restricting the inflow of the coolant liquid from the primary tank 2 to the secondary tank 3 . The liquid passage part 4 may be formed in any way as long as it is possible to pass the liquid from the secondary tank 3 to the primary tank 2. However, considering the sealing force of the float type check valve 5, It is preferably designed to flow in, particularly preferably designed to flow downwards. The liquid passage part 4 formed to flow in downward is provided with a float type check valve 5 using a float as a valve body. It is possible to seal the inflow port.

In addition, a communicating portion 8 is formed in the gas phase region above the primary tank 2 and the secondary tank 3 . Communicating portion 8 is designed to connect primary tank 2 to secondary tank in the event of a problem such as an increase in the amount of liquid in primary tank 2, such as a decrease in filtration throughput or an increase in the inflow of coolant from a machine tool. 3 has a function to flow the coolant liquid.

<Float check valve>
The float-type check valve 5 is a check valve for sealing the inlet into which the coolant flows by utilizing the buoyancy of a float whose specific gravity is smaller than that of the coolant. As for the operation of the float type check valve 5, when the liquid amount of the coolant liquid in the primary tank 2 decreases, the valve is opened, and the treated coolant liquid flows from the secondary tank 3 into the primary tank 2, and the coolant in the primary tank 2 When the amount of liquid increases, it closes to restrict the inflow from the primary tank 2 to the secondary tank 3. - 特許庁

FIG. 2 shows a schematic diagram for explaining the operation of the float type check valve 5. As shown in FIG. FIG. 2(A) is a diagram showing a state in which the treated coolant flows from the secondary tank 3 to the primary tank 2, and FIG. It is a figure which shows the state which restrict|limits an inflow.
The liquid passage part 4 shown in FIG. 2 is composed of a partition wall 14A and a partition wall 14B, and is formed so that the coolant liquid flows downward from the secondary tank 3 to the primary tank 2 . The float type check valve 5 includes a float 51 having a smaller specific gravity than the coolant liquid, and an accommodating portion 52 that accommodates the float 51. The float 51 is vertically movable inside the accommodating portion 52. .
An inflow port 53 into which the coolant liquid flows is formed in the top surface 57 of the housing portion 52, and the shape of the inflow port 53 is such that the inflow port 53 is sealed when the float 51 floats. On the other hand, a bottom portion 58 of the housing portion 52 is formed with a plurality of outflow ports 54 so that the treated coolant liquid from the secondary tank 3 flows into the primary tank 2 .
A float holding portion 55 is provided on the bottom portion 58 of the housing portion 52 . By holding the float 51, the float holding portion 55 suppresses the vibration of the float 51 when the treated coolant liquid flows in, and prevents the float 51 from rubbing against the storage portion 52 and deteriorating.

Next, the operation of the float type check valve 5 will be described. When the used coolant liquid stored in the primary tank 2 is sucked up by the pump P1, the liquid level of the primary tank 2 is lowered. When the liquid level of the primary tank 2 drops and the liquid level of the primary tank 2 falls below the float 51, the float 51 descends and the coolant flows from the secondary tank 3 into the primary tank 2 (Fig. 2 (A )). On the other hand, when the liquid level in the primary tank 2 rises, the float 51 also rises together with the liquid level in the primary tank 2 to block the inlet 53 and restrict the inflow of the coolant liquid from the secondary tank 3 to the primary tank 2. (Fig. 2(B)).

FIG. 3 shows another aspect of the float type check valve 5. As shown in FIG. In FIG. 3(A), the secondary tank 3 and the primary tank 2 are partitioned by a partition wall 15 installed in the horizontal direction, and the float type check valve is installed so as to protrude upward from the partition wall 15. ing. The secondary tank 3 and the primary tank 2 are arranged in the vertical direction, and the liquid passage part 4 is configured to flow downward. The configuration and operation of the float type check valve are the same as in FIG.
FIG. 3B shows an example in which the liquid passing portion 4 is configured so that the coolant liquid flows upward. The float type check valve has a structure in which a float 51 and a valve portion 56 are connected via a rotating shaft. 2, the water level in the primary tank 2 descends, and when the liquid level in the primary tank 2 falls below the float 51, the float 51 descends to open the valve portion 56, and the liquid level in the primary tank 2 rises. rises and the float 51 rises together with the liquid surface, the valve portion 56 closes the inflow port 53 . The shape of the float 51 need not be spherical, and may be flat.

<Sludge removal device>
The sludge removing device 7 is a device for removing sludge from the coolant liquid stored in the primary tank 2 . The sludge removing device 7 may be any device as long as it can remove sludge. A filtering device equipped with a filter is preferable from the viewpoint of excellent sludge removal performance.

The mesh size of the filter of the filtration device is appropriately designed according to the particle size of the sludge contained in the coolant liquid, and is, for example, 1 to 30 μm, more preferably 5 to 20 μm. By setting the opening of the filter to 1 μm or more, it is possible to secure a sufficient filtration throughput. On the other hand, by setting the mesh size of the filter to 30 μm or less, the coolant is sufficiently purified, and malfunctions in the machine tool 100 can be prevented.

The material of the filter is not particularly limited, but examples include polyethylene (PE), polypropylene (PP), tetrafluoroethylene (PTFE), cellulose acetate (CA), polyacrylonitrile (PAN), and polyethersulfone (PES). , polyimide (PI), polysulfone (PS) and other organic films, aluminum oxide (alumina Al ₂ O ₃ ), zirconium oxide (zirconia ZrO ₂ ), titanium oxide (titania TiO ₂ ), stainless steel (SUS), glass (SPG) and inorganic films such as

The shape of the filter may be any shape, and examples thereof include plate-like and cylindrical shapes. Filtration methods include, for example, a dead-end filtration method in which the entire amount of the coolant liquid is filtered, a cross-flow method in which the coolant liquid is filtered while flowing parallel to the membrane surface, and the like. The filtration method is not particularly limited, and can be appropriately selected in consideration of the power cost of the coolant liquid supply pump, the deposition state of sludge on the membrane surface, and the like.

Preferably, the filtering device is provided with a filter cleaning device. Examples of the filter cleaning device include, but are not limited to, a backwashing device, a scraping device, and the like. A backwashing device is a device that strips off sludge deposited on the surface of a filter by causing a fluid to flow in the direction opposite to the flow direction of filtration. The scraping device is a device for scraping sludge deposited on the filter surface by sliding a scraping member or the like on the filter surface or by blowing high-pressure air onto the filter surface. From the viewpoint of excellent cleaning performance, it is preferable to use a backwashing device. Moreover, the fluid used in the backwashing device is not particularly limited, but for example, air, filtered coolant, or the like can be used. When air is used, there is an effect that the rate of permeation through the filter is high and workability is excellent.

In addition, it is preferable that the filtering device is provided with means for detecting the state of clogging of the filter in order to determine when to wash the filter. Means for detecting the clogging state of the filter include, for example, a pressure switch for measuring the differential pressure across the filter. By using a pressure switch, when the differential pressure rises to a predetermined value, it is possible to determine that clogging has occurred and automatically activate the cleaning device.

In addition, the filtering device may be provided with means for detecting the performance of the filter in order to determine when to replace the filter. Means for detecting the performance of the filter include, for example, means for detecting the amount of filtration per unit time. When the filtration throughput per unit time falls to a predetermined value, it can be determined that the performance of the filter has deteriorated, and it is possible to decide when to replace the filter.

Moreover, it is preferable that the coolant liquid treatment system of the present invention has a plurality of filtering devices installed in parallel. By installing a plurality of filtration devices in parallel, it is possible to perform the cleaning operation and the replacement operation without stopping the operation even when the filter is cleaned or replaced.

<Pretreatment device>
The pretreatment device 6 is a device for reducing the amount of sludge in the coolant liquid, and is installed before the coolant liquid discharged from the machine tool 100 is supplied to the primary tank 2 through the flow path L1. The pretreatment device 6 may be any device as long as it can reduce the amount of sludge. For example, a magnetic separator that adheres and removes sludge by magnetic force, a sludge conveyor that collects and removes sludge that has settled on the bottom of a storage tank, and a cyclone separator that separates and removes sludge by centrifugal force. In addition, the pretreatment device 6 may use these devices singly or in combination.

Further, in the operation of the coolant liquid treatment system 1A of the present invention, it is preferable to set the amount of treatment liquid treated by the sludge removal device 7 to be larger than the amount of treatment liquid supplied to the machine tool 100. FIG. For example, the ratio of the flow rate of the sludge-containing coolant liquid supplied from the primary tank 2 to the sludge removal device 7 to the flow rate of the treated coolant liquid supplied to the machine tool 100 from the secondary tank 3 (flow rate of sludge-containing coolant liquid / processing The flow rate of the finished coolant liquid) is 1 or more, preferably 1.2 or more, and more preferably 1.4 or more. By setting the ratio of the flow rate of the sludge-containing coolant liquid to the flow rate of the treated coolant liquid to be 1 or more, a circulation flow is generated from the secondary tank 3 to the primary tank 2, so that the coolant liquid flows in the primary tank 2. Therefore, sludge deposition can be suppressed. In addition, it is possible to prevent the trouble that the supply of the coolant to the machine tool 100 is stopped due to the liquid level of the secondary tank 3 being lowered.

[Second embodiment]
FIG. 4 shows the structures of a coolant liquid treatment system 1B and a machine tool 100 according to a second embodiment of the present invention.
In the coolant liquid treatment system 1B of the second embodiment, the secondary tank 3 is divided by the partition wall 14C and the partition wall 14D, and the tertiary tank 31 is provided. In addition, the tertiary tank 31 and the secondary tank 3 are configured so that the liquid can be passed through the upper part, and the treated coolant liquid from which the sludge has been removed by the sludge removing device 7 is stored in the tertiary tank 31, and then overflows. It is configured to flow into the secondary tank 3 as a stream.
According to this coolant liquid treatment system 1B, when a trouble occurs and the coolant liquid containing sludge flows into the secondary tank 3 from the communicating portion 8, the inflow of sludge can be stopped up to the secondary tank 3. Therefore, even if the coolant containing sludge flows from the communicating portion 8 to the secondary tank 3 side, it can be restored by cleaning only the secondary tank 3 .

[Third Embodiment]
FIG. 5 shows a schematic explanatory diagram of a coolant liquid treatment system 1C and a grinder 101 according to the third embodiment of the present invention.
In the coolant liquid treatment system 1C of the third embodiment of the present invention, two filtration devices 7A and 7B are installed in parallel as sludge removal devices. Further, each of the filtering devices 7A and 7B is provided with a pressure switch SW for detecting filter clogging and a backwashing device for cleaning the filter with compressed air supplied from the air compressor AC. The filters 7A and 7B are controlled to operate alternately, and cleaning of the filters is performed while they are stopped. The sludge recovered by cleaning the filter is supplied to the sludge conveyor 61 and discharged out of the system.

The treated coolant liquid filtered by the filtering devices 7A and 7B is temporarily collected in the liquid collecting box 9 and then supplied to the tertiary tank 31 . A flow path L15 is branched from the flow path L14 between the liquid collecting box 9 and the tertiary tank 31, and the branched flow path L15 is provided with an oil feeder 10 and an optical detection means 11. . The optical detection means 11 is a device for detecting the particle diameter and the number of particles contained in the treated coolant liquid, and can detect leakage of sludge to be removed by the filtering device. The method for determining the presence or absence of sludge leakage is not particularly limited. When more particles than the set number of particles are detected, it is determined that the filter is damaged. The oil feeder 10 is a device for increasing the pressure in the flow path L15 to 0.2 MPa or higher. As a result, it is possible to suppress the generation of air bubbles due to fluctuations in the pressure in the flow path L15, and improve the measurement accuracy of the optical detection means 11. FIG.

Moreover, the coolant liquid treatment system 1</b>C of the third embodiment of the present invention includes a sludge conveyor 61 and a magnetic separator 62 as the pretreatment device 6 .
The sludge conveyor 61 is a device for separating sludge contained in the used coolant liquid by sedimentation and discharging it out of the system. The used coolant liquid is supplied from the grinder 101 to the sludge conveyor 61 through the flow path L6. The sludge conveyer 61 is also supplied with sludge generated when the filtering device 7A and the filtering device 7B are backwashed (flow path L17 and flow path L18). The sludge settled on the sludge conveyor 61 is scraped up and discharged out of the system. The supernatant liquid coolant is supplied to the magnet separator 62 through the flow path L7. The sludge conveyor 61 is provided with a liquid level gauge S1, which detects an abnormality such as a decrease in the amount of coolant.
The magnet separator 62 is a device for collecting sludge with a magnet. The magnetic separator 62 includes a rotating drum-shaped magnet that is pivotally supported in a substantially horizontal direction, and a substantially lower half of the rotating drum-shaped magnet is submerged in the coolant liquid. Sludge contained in the coolant adheres to the rotary drum magnet, and the sludge can be discharged out of the system by rotating the rotary drum magnet.
By providing the sludge conveyor 61 and the magnetic separator 62 as the pretreatment device 6 in this way, the sludge content can be greatly reduced, so the load on the filtration devices 7A and 7B can be reduced.

Further, in the coolant liquid treatment system 1C of the third embodiment of the present invention, the tertiary tank 31 is provided with the liquid temperature adjuster H1 and the liquid level gauge S3.
The liquid temperature adjuster H1 is a device for lowering the temperature of the coolant liquid that has absorbed heat in the grinding machine 101 .
The liquid level gauge S3 is a device for detecting an abnormality when the liquid level of the tertiary tank 31 drops and monitoring so that the supply of the coolant liquid to the grinding machine 101 does not stop.

Further, the coolant liquid processing system 1C of the third embodiment includes a main shaft cooling tank 102 as a configuration for supplying a coolant liquid for cooling the drive shaft of the grinding machine 101 . The spindle cooling tank 102 is composed of two tanks in which one tank is partitioned by a partition wall 102C. A tank 102A to which a coolant liquid is supplied is equipped with a liquid temperature controller H2, and the other tank 102B is equipped with a grinding machine. A pump P7 for supplying coolant to 101 and a liquid level gauge S4 for detecting an abnormality such as a decrease in the amount of coolant are provided. Moreover, a suction filter F is provided at the tip of the flow path L20 for supplying the coolant liquid to the grinder 101 to prevent foreign matter from entering the grinder 101. FIG.

Next, the coolant liquid treatment system 1C of the present invention will be described in detail with reference to FIGS. 6 to 9. FIG. FIG. 6 is a diagram (a top view of FIG. 5) showing the arrangement of the primary tank 2, secondary tank 3, and tertiary tank 31 in the coolant liquid treatment system 1C of the present invention. 7 is a diagram viewed from the aa direction in FIG. 6, FIG. 8 is a diagram viewed from the bb direction in FIG. 6, and FIG. 9 is a diagram viewed from the cc direction in FIG. It is a diagram.

As shown in FIG. 6, the primary tank 2 includes a primary tank 2A partitioned by walls 16A, 16F, 16D and 16E, and a primary tank 2B partitioned by walls 16A, 16B, 16C and 16D. consists of Further, the secondary tank 3 is partitioned by walls 16A, 16C, 16D and 16E and arranged between the primary tanks 2A and 2B. A connecting passage 17 (see FIG. 7) formed of a rectangular cylindrical body is arranged at the substantially central bottom portion of the secondary tank 3 to connect the primary tanks 2A and 2B. A float type check valve 5 is provided on the top surface of the connecting passage 17 so that coolant flows from the secondary tank 3 through the connecting passage 17 into the primary tanks 2A and 2B. The float type check valve 5 is constructed in the same manner as shown in FIG. 3(A).

The tertiary tank 31 is separated from the primary tanks 2A, 2B and the secondary tank 3 by a wall 16A. As shown in FIG. 7, an opening 18 (shaded area) is provided in the upper portion of the wall 16A, and the coolant liquid flows from the tertiary tank 31 to the secondary tank 3 as an overflow from the opening 18. As shown in FIG.

As shown in FIG. 6, flow paths L11 and L10 are installed on the wall 16A side of the primary tanks 2A and 2B, and the sludge-containing coolant liquid stored in the primary tanks 2A and 2B is sucked up by pumps P4 and P5. , filtering devices 7A and 7B (see FIG. 5). The treated coolant liquid treated by the filtering devices 7A and 7B is supplied to the tertiary tank 31 through the flow paths L12 to L15 (see FIG. 5).

6, a magnetic separator 62 is arranged above the primary tanks 2A and 2B, and the coolant treated by the magnetic separator 62 is placed on the primary tank 2A and 2B on the wall 16D side. Flow paths L8 and L9 are provided for feeding into 2B. Incidentally, as shown in FIGS. 7 to 9, the magnetic separator 62 is installed above the primary tanks 2A and 2B via a mount 64. As shown in FIGS.

As shown in FIG. 8 , a magnet separator drain 63 is formed at the bottom of the magnet separator 62 , and the coolant treated by the magnet separator 62 flows through flow paths L8 and L9 connected to the magnet separator drain 63. and flows into the primary tanks 2A and 2B. The sludge-containing coolant liquid introduced into the primary tanks 2A and 2B is transferred in the direction of the flow paths L10 and L11 by suction from the flow paths L10 and L11.
Further, as shown in FIG. 9, an inclined portion 12 is formed below the flow path L8 (and L9) to assist the transfer of the introduced sludge-containing coolant liquid in the direction of the flow paths L10 and L11. ing.

Next, processing of the coolant liquid by the coolant liquid processing system 1C will be described. As shown in FIG. 8, the sludge-containing coolant liquid discharged from the magnetic separator drain 63 is introduced into the primary tanks 2A and 2B through the flow paths L8 and L9, and stored in the primary tanks 2A and 2B. The sludge-containing coolant liquid stored in the primary tanks 2A and 2B is supplied to the filtering device 7A through the flow path L10 by the pump P4, and the sludge is removed. The treated coolant liquid from which the sludge has been removed flows into the tertiary tank 31 via the flow path L12, the liquid collection box 9, and the flow paths L14 and L15. When sludge accumulates on the filtering device 7A and the differential pressure of the filter increases, the filtering device 7A is backwashed, while the pump P5 is operated to use the filtering device 7B.

Here, when the pump P4 is operated, the positions of the liquid levels in the primary tanks 2A and 2B are lowered, and when the liquid levels in the primary tanks 2A and 2B are lower than the floats of the float type check valves 5, the floats are pushed down, The treated coolant flows from the secondary tank 3 into the primary tank 2A. Further, when the treated coolant flows from the secondary tank 3 into the primary tank 2A, the liquid surface of the secondary tank 3 is lowered and the treated coolant flows from the tertiary tank 31 into the secondary tank 3 . In this way, the coolant liquid circulates from the primary tank 2A (2B) through the filtering device 7A (7B), the tertiary tank 31 and the secondary tank 3 to the primary tank 2A (2B). A strong flow is generated inside the tank 2A (2B), and sludge deposition can be suppressed.

The coolant liquid treatment system of the present invention can be used as a device for removing sludge contained in the coolant liquid. For example, it can be used to remove sludge from a coolant liquid in a metal polishing machine using metal as a work material, a rock polishing machine using rock as a work material, or the like.

1A, 1B, 1C... coolant liquid treatment system, 2, 2A, 2B... primary tank, 3... secondary tank, 31... tertiary tank, 4... liquid passage part, 5... float type check valve, 51... float, 52...Accommodating part 53...Inlet 54...Outlet 55...Float holding part 56...Valve part 57...Top surface 58...Bottom part 6...Pretreatment device 61...Sludge conveyor 62...Magnet Separator 63 Magnetic separator drain 64 Base 7 Sludge remover 7A, 7B Filtration device 8 Communicating part 9 Liquid sampling box 10 Oil feeder 11 Optical detection means 12 Inclined portion 13 Tank 14A to 14D Partition wall 15 Partition wall 16A to 16F Wall 17 Connection path 18 Opening 100 Machine tool 101 Grinding machine 102 Spindle cooling tank 102A, 102B ... tank, 102C ... partition wall, L1 to L20 ... flow path, P1 to P7 ... pump, S1 to S4 ... liquid level gauge, H1, H2 ... liquid temperature controller, F ... suction filter, AC ... air compressor , SW... pressure switch

Claims (4)

A primary tank that stores a coolant liquid containing sludge;
a secondary tank for storing the treated coolant liquid obtained by removing the sludge from the coolant liquid containing the sludge,
The primary tank and the secondary tank are partitioned by a partition wall or wall, and are in communication via a liquid passage portion formed in the partition wall or wall. A coolant liquid treatment system characterized by comprising a float type check valve for restricting inflow into a next tank. 2. The coolant liquid treatment system according to claim 1, wherein a plurality of said primary tanks are provided. The float type check valve includes a float having a specific gravity smaller than that of the coolant liquid, and an accommodating portion that accommodates the float,
3. The coolant liquid treatment system according to claim 1, wherein the accommodating portion has an inlet into which the coolant liquid flows, and the float seals the inlet. A primary tank that stores a coolant liquid containing sludge;
A secondary tank for storing the treated coolant liquid obtained by removing the sludge from the coolant liquid containing the sludge, and a liquid communication part communicating between the primary tank and the secondary tank ,
The primary tank and the secondary tank are separated by a partition wall or wall , and the liquid passage part is formed in the partition wall or wall .
A method of using a float type check valve, wherein the float type check valve is provided in the liquid passage portion to restrict the inflow from the primary tank to the secondary tank through the liquid passage portion.

Images