KR101563992B1 - system for cooling liquid circulation - Google Patents

Abstract

The present invention relates to a system for circulating a cooling liquid capable of re-using by purifying a cooling liquid supplied to a processing part of a processing device for processing a metal workpiece in order to improve the economic efficiency of a product by improving the durability of a filter for filtering a cooling liquid while increasing the filtering efficiency of a cooling liquid. Moreover, the system for circulating a cooling liquid comprises: a first collecting part wherein a cooling liquid supplied to the processing part is flowing and stored, and wherein a circulation pump is equipped inside; a centrifugation part wherein an inlet part for supplying the stored cooling liquid to the first collecting part through the circulation pump is formed at the center of a rotating container, which is rotated by a rotation driving means at a high speed, and wherein an outlet part for discharging the cooling liquid, from which foreign substances are separated through a centrifugal force, is formed in a cover part for covering the upper part of the rotating container; a second collecting part, wherein the cooling liquid discharged through the discharging part is flowing and stored, divided from the first collecting part by a dividing partition wall and equipped to cover the outside of the first collecting part; and a cooling liquid supplying part for taking the cooling liquid stored in the second collecting part and then supplying the cooling liquid to the processing part.

Description

System for cooling liquid circulation [0002]

The present invention relates to a cooling liquid circulation system, and more particularly, to a cooling liquid circulation system that improves the efficiency of a product by increasing the filtering efficiency of the cooling liquid, but improving the durability of the filter for filtering the cooling liquid.

Generally, the cooling liquid circulating system refers to a device that is supplied to a portion where a metal workpiece is processed and purifies and re-supplies a cooling liquid contaminated with a processing by-product generated during metal working.

Here, the cooling liquid circulation system is an electric discharge machining apparatus or a grinding apparatus in which a metal workpiece is processed in a state of being immersed in a cooling liquid in order to cool the heat generated during metal working and to remove processing by-products such as fine sludge and chips, And the like.

At this time, the electric discharge machining apparatus means a method of machining a metal workpiece by using a spark which occurs when an anode and an anode collide with each other.

The electrical discharge machining tool can dissolve fine particles of a workpiece by using heat energy generated during discharge and can remove it by evaporation, and it is possible to process fine machining and complicated shape which can not be machined by a general machine tool , It is widely used for high-precision machining because there is no deformation due to heat or physical force even when machining a high-hardness material which is difficult to be generally cut by heat treatment.

The cooling liquid is provided with high-purity distilled water or discharge flow channels for improving the precision, performance and lifetime of the electric discharge machining. The cooling liquid is filtered or ionized by a filter or the like in order to prevent environmental destruction due to discharge of contaminated cooling liquid, It is reused after purifying, and it is used after compensating for the shortage in consumption of cooling liquid.

Meanwhile, the conventional cooling liquid circulation system is composed of a structure for collecting the cooling liquid containing the foreign substance sprayed by the electrode and the workpiece during the discharge machining into one dirty tank, and sending the collected liquid directly to the filter and the ion resin.

However, the conventional cooling liquid circulation system has a problem that the filtering / collecting performance of the filter and the ion resin is rapidly lowered because the cooling liquid circulating system is directly fed to the filter and the ion resin in a state where a large amount of chips and sludge are contained in the cooling liquid.

That is, in order to maintain the purity of the cooling liquid, it is required to frequently replace the filter and the ion resin, and the economical efficiency of the product is lowered as the disposal cost and the replacement cost of the waste filter and the waste ionic resin classified as industrial waste increase .

The dirty tank is provided with a circulation pump for sending the collected polluted coolant to the filter. It is often difficult to control the level of the dirty tank, so that overheating occurs due to idling of the circulation pump during low water level, There has been a problem in that it occurs.

Korea Patent No. 10-0901452

In order to solve the above problems, there is provided a cooling liquid circulation system which increases the filtering efficiency of the cooling liquid, but improves the durability of the filter for filtering the cooling liquid, thereby improving the economical efficiency of the product.

According to an aspect of the present invention, there is provided a cooling liquid circulating system for purifying and reusing a cooling liquid supplied to a processing portion of a processing device for processing metal workpieces, the cooling liquid supplied to the processing portion being introduced and stored, A first recovery unit including a circulation pump; An inlet portion through which the cooling liquid stored in the first collecting portion is supplied through the circulation pump is formed at a central portion of the rotor rotated at a high speed by the rotary driving means, and foreign matters are introduced into the cover portion covering the upper portion of the rotor by centrifugal force A centrifugal separator for forming a discharge portion through which the separated cooling liquid is discharged; A second recovering part which is partitioned by the first recovering part and the partition wall and encloses the outside of the first recovering part, And a cooling liquid supply unit for sucking the cooling liquid stored in the second recovery unit and supplying the cooling liquid to the processing unit, wherein a level adjusting hole formed to communicate with the first collecting unit and the second collecting unit is formed in the partitioning partition, A diaphragm is disposed on the inner surface of the partition wall at the first collecting portion for separating the partition wall from the partition wall by the pressure difference caused by the water level difference between the collecting portions, And a cooling fluid circulating system.

Here, it is preferable that a discharge pipe through which the cooling liquid separated from the rotary shaft is discharged is connected to the discharge portion, and the discharge pipe is extended to pass through the cooling passage formed in the casing of the rotary drive means.

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Preferably, the end of the cooling passage has a magnet filtering portion for filtering ferromagnetic machining by-products, and the cooling liquid supply portion is provided with a filter portion for purifying the cooling liquid sucked from the second recovering portion.

The circulation pump is controlled to be driven by a control unit after a predetermined time elapses after the machining apparatus is driven, and the control unit controls the circulation pump to circulate the circulation signal for supplementing the cooling liquid in accordance with a detection signal of the water level sensor provided in the circulation pump An output bin is preferred.

Through the above solution, the cooling liquid circulation system according to the present invention provides the following effects.

First, the second recovering unit is provided outside the first recovering unit, and the cooling liquid, which is first purified through the centrifugal separating unit, can be purified again by precipitation in a state of being partitioned from the first recovering unit. The use of the filter and the ionic resin part can reduce the amount of foreign matter to be adhered / filtered and the service life of the filter and the ionic water supply part can be greatly increased. Therefore, the replacement cost can be reduced and the economical efficiency of the product can be improved.

Secondly, since the cooling liquid separated from the rotary kiln passes through the cooling passage inside the rotary drive means casing, the cooling liquid flowing along the cooling passage can absorb the frictional heat generated in the casing, thereby preventing damage due to overheating of the centrifugal separator So that the durability of the product can be improved.

Thirdly, a water level control hole is formed in the partition wall, and a diaphragm is provided on the side of the first collecting part of the partition wall, so that the water level control hole can be opened or closed according to the water level difference of the collecting part without complicated control device. It is possible to prevent idling and overheating of the circulation pump and to improve the durability of the product by adjusting the water level of the first recovering portion without contamination of the cooling fluid of the second recovering portion.

Fourth, since the first recovering unit is provided inside the second recovering unit, the structure for controlling the water level of each recovering unit can be compactly installed while separately storing the contaminated cooling liquid and the filtered cooling liquid, And the economical efficiency of the product can be improved by reducing the size and the number of components.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a cooling liquid circulation system according to an embodiment of the present invention; FIG.
2 is a plan view showing a first recovery unit and a second recovery unit in a cooling liquid circulation system according to an embodiment of the present invention;
FIGS. 3A and 3B are enlarged views showing a method of adjusting the water level of the first recovering unit by enlarging the portion A in FIG.

Hereinafter, a cooling liquid circulation system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing a cooling liquid circulation system according to an embodiment of the present invention, FIG. 2 is a plan view showing a first recovery unit and a second recovery unit in a cooling liquid circulation system according to an embodiment of the present invention, FIG. 3B is an enlarged view showing a method of adjusting the water level of the first recovering portion by enlarging portion A in FIG.

1 to 3B, a coolant circulation system 100 according to an embodiment of the present invention includes a first recovering unit 10, a centrifugal separating unit 30, a second recovering unit 20, And a supply unit 50.

Here, the coolant circulation system 100 is used for purifying and reusing a coolant supplied to a machining unit of a machining apparatus for processing a metal workpiece.

Specifically, the machining apparatus means an electric discharge machining apparatus or a grinding apparatus which processes metal work in a state of being immersed in a coolant so as to cool heat generated during metal machining and remove processing by-products such as fine sludge and chips.

In this embodiment, an electric discharge machining apparatus 1 for machining a metal workpiece 3 through discharge of a wire electrode 2 to which a high-frequency pulse voltage is applied is shown and described as an example.

Here, the electric discharge machining apparatus 1 applies a high-frequency pulse voltage to the wire electrodes 2 disposed above and below the metal workpiece 3 to cause a discharge between the wire electrode 2 and the metal workpiece 3, The metal workpiece 3 is processed through the generated heat.

At this time, a coolant is stored in the machining portion 5, and the coolant is supplied at a sufficient water level so that the wire electrode 2 and the metal workpiece 3 can be locked. The wire electrode 2 is immersed in the coolant Thereby causing a discharge.

The coolant is provided with high-purity distilled water, discharge oil, or the like so as to promote the generation of discharge and improve the processing quality through a constant discharge.

In detail, the cooling liquid is circulated along the cooling liquid circulation system 100 in a state of containing processing by-products therein, such as fine sludge in the form of particles generated during discharge machining or processing by-products such as metal chips, The processed byproducts contained therein may be refined and filtered and then re-supplied to the processing portion 5 where the wire electrode 2 and the metal workpiece 3 are disposed.

The first recovering unit 10 may be disposed below the processing unit 5 and the contaminated cooling liquid stored in the processing unit 5 may be supplied to the first recovering unit 10 ). ≪ / RTI >

The polluted cooling liquid 4a is stored in a storage space formed inside the first collecting unit 10 and is sucked through the circulation pump 12 provided in the storage space and flows along the first connection pipe 14 And is supplied to the centrifugal separator 30.

On the other hand, the centrifugal separator 30 means a device for rotating the supplied cooling liquid to separate foreign matters contained in the cooling liquid through a difference in specific gravity. Here, it is preferable that the foreign matter means a processing by-product such as fine sludge or a metal chip.

In detail, the centrifugal separator 30 includes a rotator 31 and a rotator 31 rotated at a high speed by the rotator 35, and the rotator 31 and the rotation driver 35 are installed in a casing 37 forming a structure for mounting components and a cover portion 31c may be provided on the upper portion of the rotator 31. [

An inlet 31a through which the contaminated cooling liquid 4a stored in the first collecting part 10 is supplied through the circulation pump 12 is formed at the center of the rotator 31. [ The inlet 31a may be formed at the center of the cover 32 and the first connection pipe 14 may extend through the cover 31c so that an end And can be disposed adjacent to the lower surface portion.

That is, the cooling liquid 4b supplied to the inside of the rotator 31 through the first connection pipe 14 and the processing by-products contained in the cooling liquid are rotated together with the rotation of the rotator 31, So as to be brought into close contact with the inner surface of the rotor 31.

At this time, the cooling liquid 4b rises along the inner surface of the rotator 31, and the high-boiling processing by-products contained in the cooling liquid remain on the inner surface of the inner side of the rotator 31, .

The cover 31c covering the upper portion of the rotor 31 is formed with a discharge portion 31b in which the end of the discharge pipe 32 is disposed. At this time, the cooling liquid lifted along the inner surface of the rotor 31 is discharged to the discharge portion 31b in accordance with the rotation of the rotor 31, and the cooling liquid from which the foreign matter is separated flows along the discharge pipe 32 Can flow.

Referring to FIG. 2, the cooling liquid discharged through the discharge portion 31b is introduced into and stored in the second recovery portion 20.

At this time, the cooling liquid discharged through the discharge portion 31b may be directly introduced into the second recovery portion 20 along the discharge pipe 32, and additional filtering means 40 may be connected to the discharge pipe 32 And the cooling liquid passing through the filtering means 40 may flow into the second recovery unit 20. [

Here, the second collecting unit 20 is provided to surround the outside of the first collecting unit 10, and is divided into the first collecting unit 10 and the partitioning wall 11. That is, the first collecting unit 10 may be provided in the second collecting unit 20 to form a dual structure.

Since the first collecting part 10 is provided in the second collecting part 20, it is possible to separate the polluted cooling liquid and the filtered cooling liquid and to regulate the water level of the collecting parts 10 and 20 So that it can be easily installed in a small space, and the economical efficiency of the product can be improved by reducing the size and the number of components.

The second recovering unit 20 is provided with a cooling liquid 4d from which foreign matter of high boiling weight is removed through the centrifugal separating unit 30 and is separated from the first recovering unit 10, Processing by-products that have not been removed from the centrifugal separator 30 can be separated.

The cooling liquid supply unit 50 sucks the cooling liquid 4d stored in the second recovery unit 20 and supplies the cooling liquid 4d to the processing unit 5 of the electric discharge machining apparatus 1.

The cooling liquid supply unit 50 is connected to the clean water tank 52 connected to the second recovery unit 20 and the third connection pipe 51 and the cooling liquid stored in the clean water tank 52 to the fourth connection pipe 55, And a supply pump 54 for supplying the processed water to the processing unit 5 through the supply pump 54.

The cooling liquid supply unit 50 is installed in the processing unit 5 of the electric discharge machining apparatus by sucking the cooling liquid again stored in the second recovery unit 20 after the foreign substance is removed through the centrifugal separation unit 30, ).

Accordingly, since the cooling liquid 4e discharged to the machining portion of the electric discharge machining apparatus 1 is purified through the multistage filtering, it can be purified by the cooling liquid of high purity even without a separate filter, And the economical efficiency of the product can be improved.

The cooling liquid supply unit 50 may be provided with a filter 53 for purifying the cooling liquid sucked from the second recovery unit 20. The cooling liquid supply unit 50 may include a second recovery unit 20 can be sucked and supplied to the processing part 5 after finishing through the filter 53.

The second recovery unit 20 may be provided with a delivery pump 21 for delivering a cooling liquid to the filter 53. The delivery pump 21 is connected to the coolant through the third connection pipe 51, To the filter (53).

Here, the cooling liquid supply unit 50 may suck and store the cooling liquid stored in the second recovery unit 20 in accordance with the driving of the delivery pump.

The cooling liquid purified by the filter 53 may be directly stored in the cooling liquid supply unit 50 and the cooling liquid purified by the filter 53 may be stored in the cooling liquid supply unit 50 through the ion- It is also possible.

At this time, the ion-receiving portion can remove foreign substances in the form of ions in the cooling liquid purified by the filter (53).

Accordingly, since the cooling fluid having undergone the multistage filtering can be precisely purified and supplied by the filter 53 and the ionic resin portion, the circulating cooling fluid can have a very high purity, so that the cooling efficiency and the processing quality of the product can be improved.

In addition, since the amount of foreign matter adhered to the filter or the ion-receiving portion is very small, the service life of the filter 53 to the ion-receiving portion can be greatly increased, and the cost of the replacement, the cost of the waste filter and the waste ion- Can be improved.

The discharge pipe 32 is connected to the discharge portion 31b and is connected to the cooling fluid separated from the rotator 31. The discharge pipe 32 is formed in the casing 37 of the rotary drive means 35 It is preferable to extend so as to pass through the cooling passage 36.

The casing 37 may include an upper casing that surrounds the outside of the rotor 31 and a lower casing that surrounds the outside of the rotation driving unit 35. The upper casing and the lower casing may be integrally formed .

At this time, the discharge pipe (32) may be connected to the discharge portion (31b) and extend along the inside of the upper casing. The cooling passage 36 is preferably formed in the lower casing.

The term of the discharge pipe 32 passing through the cooling passage 36 is understood to mean that the discharge pipe 32 is disposed inside the cooling passage 36. The cooling passage 36, Preferably, the discharge pipe 32 is made of a metal having a high thermal conductivity, and the outer periphery of the discharge pipe 32 and the inner periphery of the cooling channel 36 are in close contact with each other so that the heat transfer area is maximized.

Of course, the cooling channel 36 may be connected to the end of the discharge pipe 32.

In detail, the rotation driving means 35 includes a rotation shaft 33 connected to the rotation center of the rotator 31, a bearing for supporting the outer periphery of the rotation shaft, and a driving motor 34 for rotating the rotation shaft .

At this time, the casing 37 of the rotation driving means 35 has a mounting space in which the rotation shaft 33 and the driving motor 34 are mounted. In the portion corresponding to the outer periphery of the rotation shaft 33, So that vibration of the rotary shaft 33 during rotation can be prevented.

The cooling passage 36 is formed to surround the rotating shaft 33 and a portion where frictional heat is generated due to rotation of the bearing. The cooling passage 36 surrounds the outside of the driving motor 34 It is also possible to extend it.

Accordingly, the cooling liquid flowing along the cooling channel 36 absorbs the heat generated in the casing 37, thereby preventing damage to the centrifugal separator 30 due to overheating, thereby improving the durability of the product .

Here, the centrifugal separator 30 is preferably disposed at a position adjacent to the paper surface so as to minimize the vibration during high-speed rotation so that the contact area with the paper surface is maximized.

In this case, it is preferable that the discharge pipe (32) is provided to pass through the auxiliary water tank (60) in which the centrifugal cooling liquid is stored, and the cooling water stored in the auxiliary water tank (60) It is preferable that an auxiliary pump 61 for supplying the oil to the flow path 36 is provided.

Accordingly, even when the centrifugal separator 30 is disposed at a low position, the centrifugal cooling fluid can smoothly flow into the cooling channel 36.

The end of the cooling channel 36 may be provided with a magnet filtering part 40 for filtering ferromagnetic machining by-products. Here, the ferromagnetic machining by-product is preferably understood to mean a ferromagnetic material among the machining by-products.

The magnet filtration unit 40 may be provided between the centrifugal separator 30 and the second collecting unit 20 and the cooling fluid discharged from the cooling channel 36 may be supplied to the magnet filtration unit 40 To the second recovery unit 20 through the second recovery unit 20.

At this time, the magnet filtering unit 40 may include an inner flow path connected to an end of the cooling flow path 36 and a permanent magnet disposed along a side of the inner flow path. The magnet filtration unit 40 may be connected to the second recovery unit 20 through a second connection pipe 41.

In detail, the cooling fluid firstly filtered by the centrifugal separator 30 flows along the internal flow path, and the ferromagnetic foreign material that can not be removed from the centrifugal separator 30 can be collected and removed by the permanent magnet.

Accordingly, the cleaning rate of the cooling liquid 4c discharged from the magnet filtration unit 40 can be increased, and the cooling liquid having a higher purity can be stored in the second recovery unit 20. [

The permanent magnet may be selectively detachable. In the case where the ferromagnetic machining byproduct is not generated, or when there is a possibility that the cooling liquid may be denatured when magnetic force is applied, the permanent magnet may be operated in a state in which the permanent magnet is removed .

3A and 3B, the partition wall 11 is formed with a water level adjusting hole 11a formed to communicate with the first collecting portion 10 and the second collecting portion 20.

On the inner surface of the partitioning wall 11 on the side of the first collecting portion 10 is formed a water level control hole spaced apart from the partitioning wall 11 by a pressure caused by a water level difference between the collecting portions 10, And a diaphragm 11b for selectively opening the diaphragm 11a.

At this time, it is preferable that the second recovering unit 20 is filled with the cooling liquid or the supplemented cooling liquid filtered at an appropriate level or higher.

Here, the diaphragm 11b may be formed of a flexible material, and may be formed of an epoxy or polyamide-based synthetic resin film having a predetermined rigidity and being elastically deformable under an external force equal to or greater than a predetermined value.

A seal coating portion of an elastic material such as silicone or rubber is preferably provided at a portion of the diaphragm 11b facing the water level adjusting hole 11a so as to improve the hermeticity when the water level adjusting hole 11a is in close contact with the water level adjusting hole 11a Do.

Specifically, the diaphragm 11b is sized to shield the water level adjusting hole 11a, and one end of the diaphragm 11b is coupled to the outside of the water level adjusting hole 11a. At this time, the diaphragm 11b may be in close contact with the partitioning wall 11 in the absence of an external pressure to shield the water level adjusting hole 11a, and when the external pressure is applied, the other end of the diaphragm 11b The water level adjusting hole 11a can be opened away from the partitioning wall 11.

The diaphragm 11b is made of an elastic material and is elastically deformed in a state where an external pressure is applied to the diaphragm 11b. The diaphragm 11b is separated from the partitioning wall 11 at the other end and is restored when the external pressure is removed. The water level adjusting hole 11a can be shielded.

In detail, the diaphragm 11b is provided on a surface facing the first collecting part 10 in the partitioning wall 11, and the water level adjusting holes 11a When the pressure in the direction of the first collecting part 10 is formed in the second collecting part 20, the diaphragm 11b may be separated from the partitioning wall and the water level adjusting hole 11a may be opened.

That is, when the water level of the first recovery unit 10 and the second recovery unit 20 are different, pressure may be applied to the diaphragm 11b, and when the water level of the first recovery unit 10 is lower than the water level of the second recovery unit 20, The cooling liquid 4d stored in the second recovery unit 20 flows along the water level control hole 11a and the diaphragm 11b flows into the first recovery unit 10 when the temperature of the first recovery unit 10 is lower than the water level of the second recovery unit 20, The water level adjusting hole 11a can be opened.

This makes it possible to prevent the water level of the first recovery unit 10 from dropping below a certain level and to prevent the circulation pump 12 in the first recovery unit 10 from idling due to the low water level of the first recovery unit 10, And overheat damage due to idling can be prevented.

At this time, the water level adjustment hole 11a is kept open until the water level of the first water recovery unit 10 becomes equal to the water level of the second water recovery unit 20, The diaphragm 11b closes the water level adjusting hole 11a and the contaminated cooling liquid 4a stored in the first collecting portion 10 flows to the second collecting portion 20 to cool the filtered cooling liquid 11a, (4d) can be prevented from being contaminated.

Since the diaphragm 11b is provided on the side of the first collecting part 10 of the partitioning wall 11 with the water level adjusting hole 11a formed in the partitioning wall 11, The cooling fluid of the second collecting part 20 can be unidirectionally flowed toward the first collecting part 10 as the water level adjusting hole 11a is opened or closed according to the water level difference between the first collecting part 20 and the second collecting part 20.

Accordingly, the water level of the first recovery unit 10 can be adjusted without contamination of the cooling liquid of the second recovery unit 20 due to the cooling liquid of the first recovery unit 10, and the idling and overheating of the circulation pump 12 can be prevented So that the durability of the product can be improved.

At this time, a diaphragm mounting groove (not shown) may be formed at the rim of the water level adjusting hole 11a for mounting the diaphragm 11b. When the diaphragm 11b is closed, It is possible to more reliably prevent the cooling liquid from flowing to the second recovering portion.

It is preferable that the circulation pump 12 is controlled to be driven by a controller after a predetermined time elapses after the electric discharge machining apparatus 1 is driven. That is, when the electric discharge machining apparatus 1 is driven, the supplied cooling liquid 4e of the machining unit 5 is contaminated by machining by-products generated during machining, and the contaminated cooling liquid flows along the discharge pipe 5a And is stored in the first recovery unit 10.

At this time, when the circulating pump 12 is driven when the water level of the first recovering unit 10 is less than a predetermined level, idling is generated and electric power may be wasted, and durability due to overheating of the circulating pump 12 during idling Can be degraded.

Accordingly, the control unit determines that the water level of the first recovery unit 10 is equal to or greater than a predetermined level after a predetermined time elapses after the cooling liquid is ejected from the electric discharge machining apparatus 1, and drives the circulation pump 12.

Here, the water level in the first collecting part 10 is maintained at a predetermined level or higher through the water level adjusting hole 11a and the diaphragm 11b provided between the first collecting part 10 and the second collecting part 20 The time from the driving of the electric discharge machining apparatus 1 to the driving of the circulation pump 12 can be set to be short.

Accordingly, even when the total amount of the cooling liquid circulated in the circulation system 100 is small, the circulation pump 12 can be circulated smoothly without idling or overheating.

At this time, the controller may output a circulation signal for supplementing the coolant according to a sensing signal of the water level sensor provided in the circulation pump 12. The cooling liquid discharged to the machining portion of the electric discharge machining apparatus 1 is recycled and circulated in the circulation system 100, but the total amount can be reduced if the number of times of reuse is increased due to reasons such as evaporation.

When the total amount of the cooling fluid in the circulation system 100 is reduced, there may be a case where the discharged cooling fluid is insufficient at the time of continuous use of the electric discharge machining apparatus. Therefore, a certain amount or more of the cooling fluid must circulate in the circulation system.

At this time, the circulation pump 12 is provided with a water level sensor, and the water level sensor sends a signal to the control unit when the cooling liquid stored in the first water collection unit 10 falls below a predetermined level.

The control unit outputs a circulating signal according to the received signal. Accordingly, the user can easily know that the cooling liquid is insufficient in the circulation system, and the productivity of the product can be improved by preventing the cooling efficiency and the deterioration of the processing quality due to the lack of the cooling liquid.

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And such modifications are within the scope of the present invention.

1: electric discharge machining device 2: wire electrode
3: metal workpiece 5: machining part
4a, 4b, 4c, 4d, 4e: cooling liquid 10:
11: partitioning partition 11a: leveling hole
11b: diaphragm 12: circulation pump
20: second recovering portion 30: centrifugal separating portion
31: Tradition 32: Discharge tube
33: rotating shaft support part 37: casing
40: magnet filtration unit 50: cooling liquid supply unit

Claims (5)

A cooling liquid circulating system for purifying and reusing a cooling liquid supplied to a processing part of a processing device for processing a metal workpiece,
A first recovering part in which a coolant supplied to the machining part is introduced and stored, and a circulation pump is provided therein;
An inlet portion through which the cooling liquid stored in the first collecting portion is supplied through the circulation pump is formed at a central portion of the rotor rotated at a high speed by the rotary driving means, and foreign matters are introduced into the cover portion covering the upper portion of the rotor by centrifugal force A centrifugal separator for forming a discharge portion through which the separated cooling liquid is discharged;
A second recovering part which is partitioned by the first recovering part and the partition wall and encloses the outside of the first recovering part, And
And a cooling liquid supply unit for sucking the cooling liquid stored in the second recovery unit and supplying the cooling liquid to the processing unit,
Wherein the partition wall is formed with a water level adjusting hole formed so as to communicate with the first collecting portion and the second collecting portion so as to communicate with the partition wall, Wherein the diaphragm is spaced apart from the water level adjusting hole and is opened when the pressure is removed, thereby shielding the water level adjusting hole. delete The method according to claim 1,
Wherein the discharge unit is connected to a discharge pipe through which the cooling liquid separated from the rotary shaft is discharged, and the discharge pipe extends to pass through a cooling passage formed in the casing of the rotary drive unit. The method of claim 3,
And a magnet filtering portion for filtering the ferromagnetic machining by-product by a magnetic force is provided at an end of the cooling passage,
Wherein the cooling liquid supply unit is provided with a filter unit for purifying the cooling liquid sucked from the second recovery unit. The method according to claim 1,
Wherein the circulation pump is controlled to be driven by a control unit after a predetermined time elapses after driving of the processing apparatus,
Wherein the control unit outputs a circulation signal for supplementing the cooling fluid according to a detection signal of the water level sensor provided in the circulation pump.

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