KR20160085000A - Cutting oil tank - Google Patents

Abstract

A cutting oil tank comprises: a first tank inserted under a bed of a machine tool, and having cutting oil discharged from the machine tool, a storage unit to store a cutting chip, and a first pump to transmit cutting oil containing the cutting chip of the storage unit to a second tank; and the second tank separated to be arranged at one side of the first tank, and having a filter unit to filter the cutting chip by being supplied with the cutting oil containing the cutting chip from the first pump and a second pump to supply the cutting oil filtered in the filter unit to the machine tool.

Description

CUTTING OIL TANK

The present invention relates to a coolant tank. More particularly, the present invention relates to a coolant tank capable of storing coolant discharged from a machine tool and cutting chips.

A machine tool, for example, a machining center, is a machine for machining a workpiece using a tool, and a tool coupled to the spindle can rotate and perform work such as cutting a workpiece. At this time, cutting oil may be used to remove heat generated during machining of the workpiece and cutting chips.

The cutting oil can be sprayed on the contact portion between the tool and the workpiece. The injected cutting oil can be recovered into the coolant tank together with the cutting chips. The coolant tank can filter the chips from the coolant and feed the filtered coolant back to the machine tool.

On the other hand, the coolant tank can be inserted under the machine tool. Therefore, there is a problem that a large clearance space is required for inserting the coolant tank under the machine tool or for extracting the coolant tank to the outside of the machine tool for inspection.

Further, a conveyor for removing cutting chips can be mounted on the coolant tank. Accordingly, in order to insert the coolant tank including the conveyor under the machine tool, the height of the bed of the machine tool can be increased. The elevated bed has a problem that the stability is poor and the convenience of operation is poor.

An object of the present invention is to provide a detachable coolant tank.

Another object of the present invention is to provide a coolant tank having a low height.

According to an aspect of the present invention, there is provided a coolant tank comprising: a storage portion for storing cutting oil and cutting chips inserted under a bed of a machine tool and discharged from the machine tool; A first tank including a first pump for transferring cutting oil containing a cutting chip to a second tank, and a second tank disposed separately at one side of the first tank for supplying a cutting oil containing cutting chips from the first pump And a second tank having a filter portion for filtering the chip and a second pump for supplying the coolant filtered by the filter portion to the machine tool.

In the exemplary embodiments, the second tank may further include a deceleration unit installed between the first pump and the filter unit, for reducing the flow rate of the coolant supplied from the first pump to the filter unit.

In the exemplary embodiments, the deceleration portion may include a connector connected to the first pump, a first deceleration tank connected to one end of the connector and having a slot for discharging coolant, and a second deceleration tank surrounding the first deceleration tank And a second reduction tank having a discharge port opened toward the filter unit at a lower end thereof.

In exemplary embodiments, the area of the slot may be greater than the cross-sectional area of the connector, and the area of the outlet may be greater than the area of the slot.

In exemplary embodiments, the first tank may further include a level sensor for measuring the amount of coolant stored in the first tank.

In exemplary embodiments, when the level of the cutting oil in the first tank measured by the level sensor is equal to or higher than a predetermined height from the ground, the first pump may operate to transfer the coolant to the second tank.

In exemplary embodiments, the bottom surface of the reservoir is gradually moved from a first end of the first tank in a direction in which coolant and cutting chips are introduced from the machine tool toward an opposite second end to which the second tank is connected Can be inclined to be lowered.

In the exemplary embodiments, the first tank may include a manifold installed at the first end and having at least one outlet for receiving coolant from the second tank and discharging the coolant onto the bottom surface of the reservoir, And at least one spray nozzle extending from the discharge port toward the second end on the bottom surface and spraying the coolant onto the bottom surface of the storage part.

In exemplary embodiments, the injection nozzles may extend longer from the manifold into the second end toward the outside of the first reservoir.

In exemplary embodiments, the second tank may further include a third pump for supplying coolant to the manifold.

In exemplary embodiments, the second pump may supply coolant to the manifold.

In the exemplary embodiments, the second pump may further include a control valve for selectively supplying coolant to the machine tool or the manifold.

The coolant tank according to the exemplary embodiments can be divided into two parts that are inserted into the lower part of the machine tool and not inserted into the lower part of the machine tool. Accordingly, the space required for inserting the coolant tank into the lower portion of the machine tool may be small.

In addition, since the cutting oil tank can be performed at a portion where the cutting chip filtering operation is not inserted into the lower portion of the machine tool, the portion inserted into the lower portion of the machine tool may not include a conveyor or the like for chip chip filtering. Accordingly, the height of the portion of the coolant tank inserted into the lower portion of the machine tool may be reduced. As a result, the height of the bed of the machine tool can be lowered, and the structural stability and workability of the machine tool can be improved.

However, the effects of the present invention are not limited to the above-mentioned effects, and may be variously expanded without departing from the spirit and scope of the present invention.

1 is a perspective view showing a machine tool in which a coolant tank is inserted according to exemplary embodiments.
2 is a side view showing a machine tool in which the coolant tank of FIG. 1 is inserted.
3 is a perspective view illustrating a coolant tank according to exemplary embodiments.
Fig. 4 is a plan view showing the coolant tank of Fig. 3;
5 is a cross-sectional view of the coolant tank of FIG. 4 taken along line AA '.
6 is an exploded view showing the decelerating portion of Fig.
FIG. 7 is a cross-sectional view of the second reduction tank of FIG. 6 taken along line BB '; FIG.

For the embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be practiced in various forms, The present invention should not be construed as limited to the embodiments described in Figs.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprise", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be construed as meaning consistent with meaning in the context of the relevant art and are not to be construed as ideal or overly formal in meaning unless expressly defined in the present application .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

1 is a perspective view showing a machine tool in which a coolant tank is inserted according to exemplary embodiments. 2 is a side view showing a machine tool in which the coolant tank of FIG. 1 is inserted.

1 and 2, a coolant tank 20 according to exemplary embodiments includes a first tank 100 inserted into the lower portion of the machine tool 10 and a second tank 100 disposed separately from the first tank 100 And may include a second tank 200.

For example, the machine tool may be a machining center. The machining center can perform drilling, boring, milling cutting, reaming, and tapping operations all in one machine tool. In addition, the machining center may include a Numerical Control Device (not shown) and an Automatic Tool Changer (ATC, not shown). The numerical control apparatus can control various kinds of tools and can precisely process workpieces of various shapes.

When the machine tool processes a workpiece, frictional heat may occur between the workpiece and the tool. The frictional heat may damage the tool and affect the cutting surface of the work, which may adversely affect the machining quality of the machine tool. Accordingly, cutting oil can be used to reduce the frictional heat and cool the tool.

The cutting oil can be sprayed onto the contact portion between the tool and the workpiece. The ejected cutting oil can be recovered to the coolant tank 20 together with the cutting chips. The coolant tank 20 can filter the chips from the cutting oil and supply the filtered coolant to the machine tool 10 again.

The first tank 100 may be inserted into the lower portion of the machine tool 10 from the front to the rear of the machine tool 10. At this time, the front of the machine tool 10 can indicate the direction in which the numerical control device and the door (not shown) are provided in the machine tool 10. The inserted first tank 100 may be located below a bed (not shown) of the machine tool 10. [ A chute (not shown) may be formed between the bed and the first tank 100. The chute can guide the cutting oil and the cutting chip to the first tank 100 to prevent the cutting oil and the cutting chips from being scattered to the outside.

The first tank 100 can store cutting oil and cutting chips discharged from the machine tool 10. [ In this case, the first tank 100 only functions to store the cutting oil, and the second tank 200 can separate the cutting chips from the cutting oil and supply them to the machine tool 10. [ Accordingly, the first tank 100 may not include a separate device for filtering and discharging the chips to the outside, for example, a conveyor, etc., and the upper surface of the first tank 100 may have a low height Lt; / RTI > As the height of the first tank 100 decreases, the bed of the machine tool 10 may also be located at a lower height from the ground.

The second tank 200 is separately disposed at one side of the first tank 100 and can be supplied with cutting oil and cutting chips from the first tank 100. The second tank 200 can filter the chips from the cutting oil and supply the filtered cutting oil back to the machine tool 10. [ In this case, the second tank 200 is connected to the first tank 100 and the first tank 100, which will be described later, by first and second connection lines 112 and 222, which will be described later, And cutting chips can be exchanged.

3 is a perspective view illustrating a coolant tank according to exemplary embodiments. Fig. 4 is a plan view showing the coolant tank of Fig. 3; 5 is a cross-sectional view of the coolant tank of FIG. 4 cut along the line A-A '. 6 is an exploded view showing the decelerating portion of Fig. 7 is a cross-sectional view of the second reduction tank of FIG. 6 taken along the line B-B '. In this case, for the sake of convenience of explanation, the direction in which the cutting oil tank 20 faces forward of the machine tool 10 is defined as the front of the cutting oil tank 20 and the direction opposite thereto is defined as the rear of the cutting oil tank 20 do.

3 to 7, a coolant tank 20 according to exemplary embodiments includes a first tank 100 inserted below the machine tool 10 and a second tank 100 disposed separately at one side of the first tank, (200). The first tank 100 may store the cutting oil and cutting chips discharged from the machine tool 10 and may transfer the same to the second tank 200. The second tank 200 can receive the cutting oil from the first tank 100 and filter the cutting chips, and can supply the filtered cutting oil to the machine tool 10 again.

In the exemplary embodiments, the first tank 100 includes a reservoir 150 that provides a space for storing coolant and cutting chips discharged from the machine tool 10, And a first pump 110 for delivering the cutting chips to the second tank 200.

For example, cutting oil may be introduced into the reservoir from the front upper portion of the first tank, and may be transferred to the second tank by the first pump installed in the rear of the first tank. However, the position where the cutting oil flows into the storage part 150 and the position where the first pump 110 is installed are not limited to this, but may be arranged at various positions as required.

The storage portion 150 may include a bottom surface 152 and side walls 154 surrounding the bottom surface 152. The cutting oil and cutting chips discharged from the machine tool 10 can be received in a space defined by the bottom surface 152 and the side wall 154. [ For example, the bottom surface may have a rectangular shape. Alternatively, the shape of the bottom surface 152 and the height of the side wall 154 may be varied as desired.

The storage unit 150 may further include a cover (not shown) coupled to the top of the side wall 154. The cover may be installed on the side wall 154 to face the bottom surface 152 and prevent contaminants from entering the inside of the storage unit 150 from the outside.

In exemplary embodiments, the bottom surface 152 may be formed obliquely to be gradually lowered from the front to the rear of the first tank 100. That is, the height H1 of the upper surface of the bottom surface 152 in front of the first tank 100 may be higher than the height H2 of the upper surface of the bottom surface 152 in the rear of the first tank 100. Accordingly, the coolant introduced into the storage unit 150 can be transferred from the front to the rear of the first tank 100 along the inclined bottom surface 152.

In the exemplary embodiments, the first tank 100 is disposed in front of the first tank 100 and includes a manifold (not shown) for flowing coolant onto the bottom surface 152 toward the rear of the first tank 100, And at least one injection nozzle 140 extending from the manifold 130 to the rear of the first tank 100. [ In this case, the cutting oil can be supplied from the second tank 200 to the manifold 130 through the second connection line 222 and the flow path 134, which will be described later, and the manifold 130, The nozzle 140 may spray the cutting oil onto the bottom surface 152 of the storage part 150.

The manifold 130 may be installed in front of the first tank 100 and may include at least one outlet 132 that opens toward the bottom surface 152. For example, the manifold may be installed on the bottom surface within the sidewall. A flow path 134 may be connected to one side of the manifold 130. The manifold 130 can receive the cutting oil through the flow path 134 and discharge the supplied cutting oil onto the bottom surface 152 through the discharge port 132. The cutting oil discharged onto the bottom surface 152 can transfer cutting chips on the bottom surface 152 to the rear of the first tank 100. The cutting chips transferred to the rear of the first tank 100 may be transferred to the second tank 200 together with the cutting oil by the first pump 110. [

The injection nozzle 140 may be connected to the discharge port 132 of the manifold 130 to extend toward the rear of the first tank 100 and increase the flow rate of the cutting oil flowing out from the discharge port 132. The flow rate of the cutting oil sprayed onto the bottom surface 152 through the spray nozzle 140 may be faster than the flow rate of the cutting oil discharged through the discharge port 132 and the cutting chips on the bottom surface 152 So that it can be transported better toward the rear of the tank 100.

4, the first tank 100 is illustrated as including four injection nozzles 140, but the number of the injection nozzles 140 connected to the manifold 130 is not limited thereto Do not.

On the other hand, when the injection nozzles 140 are not connected to the manifold 130 or all of the injection nozzles 140 having the same length are connected, the flow rate of the cutting oil flowing on the bottom surface 152 is higher than that of the manifold 130, May not be constant along the extending direction of the first electrode 130. For example, by friction with the side wall 154, the flow rate of the cutting fluid on the bottom surface 152 can be minimized around the side wall 154. Therefore, cutting chips that are not properly transported can be accumulated around the side wall 152. [

In the exemplary embodiments, the injection nozzles 140 may be formed to extend longer from the manifold 130 as the sidewalls 154 of the first tank 100 are closer. In this case, the longer the length of the injection nozzle 140, the more the flow rate of the coolant jetted through the injection nozzle 140 can be increased. For example, the length of the first injection nozzle 142 disposed closer to the side wall may be longer than the length of the second injection nozzle 144 disposed inside the first injection nozzle 142. Accordingly, the flow rate of the cutting oil flowing on the bottom surface 152 can be uniformly maintained, and the chip accumulation around the side wall 152 can be prevented.

The first pump 110 may be installed behind the first tank 100 and may transfer the coolant and chips stored in the storage unit 150 to the second tank 200. For example, the suction portion (not shown) of the first pump 110 may communicate with the storage portion 150 of the first tank 100 and may be connected to the deceleration portion 230 It is possible to supply cutting oil containing cutting chips.

In the exemplary embodiments, the first tank 100 may further include a level sensor 120 for controlling the first pump 110 according to the level of the coolant stored in the reservoir 150.

For example, the level sensor may measure the level of the coolant stored in the storage unit and transmit the measured level to the numerical controller of the machine tool. When the measured level of the coolant is equal to or higher than a preset level, the numerical controller can operate the first pump to transfer the coolant stored in the reservoir to the second tank. In contrast, when the measured level of the coolant is below the predetermined level, the numerical controller can stop the operation of the first pump and stop the coolant transfer to the second tank.

As described above, the first tank 100 can receive the cutting oil and cutting chips discharged from the machine tool 10 into the storage part 150. [ The cutting oil can be conveyed to the rear of the first tank 100 with the first pump 110 along the inclined bottom surface 152 of the storage part 150. [ At this time, most of the cutting chips may be transported with the cutting fluid, but some may remain on the bottom surface 152 without being transported. The manifold 130 and the injection nozzles 140 can transfer the cutting chips remaining on the bottom surface 152 to the rear of the first tank 100 without being transported by jetting the cutting oil onto the bottom surface 152 .

The cutting oil and the cutting chips transferred to the rear of the first tank 100 may be transferred to the second tank 200 by the first pump 110. In this case, the level sensor 120 can measure the amount of the cutting oil stored in the storage unit 150, and the numerical control apparatus of the machine tool 10 can measure the amount of the cutting oil stored in the first pump 110 can be controlled.

The second tank 200 includes a filter unit 210 for separating cutting chips from the cutting oil, a supply unit 250 for storing the coolant filtered by the filter unit 210, a coolant supply unit 250 for supplying the coolant stored in the supply unit 250 to the machine tool And a deceleration unit 230 for reducing the flow rate of the cutting oil supplied from the first tank 100 to the filter unit 210. [

In the exemplary embodiments, the deceleration portion 230 is connected to one end of the connector 232, which is connected to the first connection line 112 of the first pump 110, to attenuate the flow rate of the coolant The first and second deceleration tanks 234 and 236, respectively.

The first reduction tank 234 is connected to the connector 232 and may include a slot 235 for discharging coolant on its surface. The coolant introduced into the first reduction tank 234 can be discharged through the slot 235. The second reduction tank 236 may surround the first reduction tank 234 and may include a discharge port 237 opened toward the filter unit 210. The second reduction tank 236 can be sealed by the cover 238 and the packing 239 to prevent the cutting oil from leaking to a portion other than the discharge port 237. [ The cutting oil discharged from the first reduction tank 234 may be discharged to the outside of the reduction portion 230 through the discharge port 237 at the lower end of the second reduction tank 236. The cutting fluid discharged from the first pump 110 flows into the connector 232 through the first connection line 112 and flows into the slot 235 of the first reduction tank 234 and the discharge port 236 of the second reduction tank 236, And then to the filter unit 210 in order.

In this case, since the connector 232, the first reduction tank 234, and the second reduction tank 236 are connected in series to receive the coolant from the first pump 110, the connectors 232, The flow rates of the coolant passing through the first reduction tank 234 and the second reduction tank 236 may be equal to each other. This is based on the continuity equation and can be expressed as [Equation 1].

[Equation 1]

In this case, Q represents the flow rate of the fluid flowing through the tube, V represents the flow rate of the fluid, and A represents the cross-sectional area of the tube through which the fluid flows.

According to the continuity equation, the flow rate of the fluid flowing through the tube at steady flow is constant regardless of the cross-sectional area. In this case, the steady flow means a flow in which the velocity of the fluid at each point does not change with time.

The flow rate of the coolant flowing through the connector 232, the first reduction tank 234, and the second reduction tank 236 may be constant, assuming that the cutting oil flowing in the reduction portion 230 has a constant density and a constant flow rate . However, as the cross-sectional area of the pipe through which the cutting oil flows changes, the flow rate of the cutting oil may be changed.

The area A2 of the slot 235 may be greater than the cross sectional area A2 of the connector 232 and the area A3 of the outlet 237 may be larger than the area A2 of the slot 235 ). The flow rate V2 of the cutting oil discharged through the slot 235 may be smaller than the flow velocity V1 of the cutting oil flowing through the connector 232 and the flow rate The flow velocity V3 of the cutting oil discharged through the slot 237 may be smaller than the flow velocity V2 of the cutting oil discharged through the slot 235. [

For example, if the area A2 of the slot 235 is 10 times larger than the sectional area A2 of the connector 232 and the area A3 of the discharge port 237 is twice the area A2 of the slot 235 The flow velocity V3 of the cutting oil discharged through the discharge port 237 may be 20 times smaller than the flow velocity V1 of the cutting oil flowing through the connector 232. [ Therefore, the flow rate of the cutting oil discharged from the first pump 110 can be reduced through the reduction portion 230.

The filter unit 210 is provided at a lower portion of the deceleration unit 230 and can filter chips from the cutting oil. For example, the filter section may include filters (not shown) for filtering the chips. The cutting oil supplied from the first pump 110, which includes the cutting chips, can be filtered while passing through the filters. The coolant filtered by the cutting chip can be stored in the supply unit 250.

The supply unit 250 may be disposed below the filter unit 210. The supply unit 250 can store the coolant filtered by the chip by the filter unit 210. [

In exemplary embodiments, the feeder 250 may further include a drain pipe 260 communicating with the reservoir 150 of the first tank 100. The other end of the drain pipe 260 may communicate with the supply part 250 of the second tank 200. The drain pipe 260 guides a part of the coolant stored in the supply unit 250 to the first tank 100 and supplies the coolant to the supply unit 250. [ It is possible to control the amount of the coolant stored in the cooler.

The second pump 220 can suck the coolant from the supply unit 250 and discharge the coolant to the machine tool 10. For example, the suction portion (not shown) of the second pump 220 may communicate with the supply portion 250 of the second tank 200. The filtered coolant stored in the supply unit 250 may be supplied to the machine tool 10 by the second pump 220.

In the exemplary embodiments, the second pump 220 may further include a control valve 240 for selectively supplying coolant to the manifold 130. For example, if the control valve is in the first position, the coolant discharged from the second pump can be supplied to the machine tool. When the control valve is in the second position, the coolant discharged from the second pump can be supplied to the manifold through the second connection line 222 and the flow passage 134 in order.

Alternatively, in the exemplary embodiments, the second tank 200 may further include a third pump (not shown) for supplying coolant to the manifold 130. In this case, the cutting oil discharged from the second pump 220 can be supplied to the machine tool 10, and the cutting oil discharged from the third pump can be circulated through the second connection line 222 and the oil line 134 As shown in FIG.

As described above, the coolant tank 20 can store cutting oil inserted into the lower portion of the machine tool 10 and discharged from the machine tool 10 and cutting chips. The cutting chips are filtered from the cutting oil, ).

In this case, only the first tank 100 may be inserted into the lower portion of the machine tool 10, and the second tank 200 may not be inserted into the lower portion of the machine tool 10. The first tank 100 inserted into the lower portion of the machine tool 10 may have a relatively low height because it only provides a space for storing cutting oil and cutting chips. Therefore, the bed installed above the first tank 100 of the coolant tank 20 can be installed at a low height from the ground.

In addition, the coolant tank 20 can be separated into the first and second tanks 100 and 200. Accordingly, the separated first tank 100 can be inserted into the lower portion of the machine tool 10, and then the second tank 200 can be connected to the first tank 100. [ That is, when the clearance for inserting the first tank 100 into the lower portion of the machine tool 10 is secured, the coolant tank 20 can be installed on the machine tool 10. [ Accordingly, the coolant tank 20 can be installed on the machine tool 10 with less clearance than when the entire cutting oil tank 20 is inserted into the lower portion of the machine tool 10.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. It can be understood that it is possible.

10: Machine tool 20: Coolant tank
100: first tank 110: first pump
112: first connection line 120: level sensor
130: manifold 132: outlet
134: flow path 140: injection nozzle
142: first injection nozzle 144: second injection nozzle
150: storage part 152: bottom surface
154: side wall 200: second tank
210: filter unit 220: second pump
222: second connection line 230: deceleration section
232: connector 234: first reduction tank
235: Slot 236: Second deceleration tank
237: discharge port 238: cover
239: packing 240: control valve
250: supply part 260: drain pipe

Claims (6)

And a first pump inserted under the bed of the machine tool to deliver cutting oil discharged from the machine tool and a cutting oil of the storage part to a second tank, 1 tank; And
A filter unit disposed separately at one side of the first tank and adapted to filter cutting chips by receiving cutting oil supplied from the first pump with cutting chips and a controller for supplying the cutter oil filtered by the filter unit to the machine tool And a second tank having a second pump. [2] The apparatus of claim 1, wherein the second tank further comprises a deceleration unit installed between the first pump and the filter unit, for reducing the flow rate of the coolant supplied from the first pump to the filter unit Coolant tank. 3. The apparatus according to claim 2,
A connector connected to the first pump;
A first reduction tank connected to one end of the connector and having a slot for discharging cutting oil outside; And
And a second reduction tank that surrounds the first reduction tank and has a discharge port that is opened toward the filter unit at a lower end thereof. The apparatus of claim 1, wherein the bottom surface of the reservoir is configured such that from a first end of the first tank in a direction in which coolant and cutting chips are introduced from the machine tool is gradually lowered from a first end of the first tank to an opposite second end of the second tank, Wherein the coolant tank is inclined. 5. The fuel cell system according to claim 4,
A manifold installed at the first end and having at least one outlet for receiving coolant from the second tank and discharging the coolant onto the bottom of the storage; And
Further comprising at least one spray nozzle extending from the discharge port toward the second end on the bottom surface of the storage part and for spraying the coolant onto the bottom surface of the storage part. The coolant tank according to claim 5, wherein the injection nozzles extend longer from the manifold toward the second end toward the outside of the first storage portion.

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