JP4461232B2 - Oil separation device in degreasing and washing tank and oil separation method - Google Patents

Description

  The present invention relates to the field of degreasing and cleaning oil that adheres to metal parts and steel plates, etc., in a degreasing and cleaning tank that removes oil used for the purpose of ease of processing and rust prevention from a degreasing cleaning liquid in metal parts and steel plates. The present invention relates to an oil separation device and an oil separation method thereof.

  As shown in FIG. 9, the conventional oil separation apparatus includes a main degreasing and washing tank 100 and an oil separation tank 102 installed on a gantry 101, and the oil separation tank 102 has an overflow partition. An oil separation chamber 104 and an oil disposal chamber 105 are partitioned by a plate 103.

  The main degreasing and cleaning tank 100 communicates with the oil separation chamber 104 through a supply piping system 106. That is, the supply piping system 106 is configured by connecting the suction pipe 108 to the suction side of the liquid injection pump 107 and connecting the discharge pipe 109 to the discharge side of the liquid injection pump 107. Is inserted into the main degreasing and cleaning tank 100, and the discharge port side of the discharge pipe 109 is inserted into the oil separation chamber 104.

  A suction head 110 is provided in the oil separation chamber 104, and a return pipe 111 connected to the suction head 110 is inserted into the main degreasing and cleaning tank 100.

  Then, a degreasing cleaning liquid 112 in which oil is mixed by degreasing cleaning of metal parts and steel plates in the main cleaning tank 100 is injected into the oil separation chamber 104 by the liquid injection pump 107, and the oil content and the degreasing cleaning liquid are separated in the oil separation chamber 104. Thus, only the oil content is overflowed to flow into the oil disposal chamber 105, and the degreasing cleaning liquid is sucked by the suction head 110 and returned to the main cleaning tank 100 through the suction return pipe 111.

Further, as a conventional oil separation apparatus, there are an oil separation tank for separating oil in a liquid and an apparatus for discarding oil components floating in a tank. In this oil separation apparatus, either a granular adsorbent or a fibrous adsorbent that forms a zigzag communication path from the bottom to the top of the liquid is installed in the first chamber of the container. By narrowing the distance between each other, it is easy to cause electrostatic aggregation between the oil molecules, and the oil molecules are made into large lumps and floated above the second chamber, and the oil accumulated above the second chamber overflows. In some cases, the oil component discharged to the outside of the container and floated on the liquid in the tank is caused to flow into the container from the hole of the float-like oil recovery device and to flow out of the flow pipe (see Patent Document 1).
JP 7-227503 A

  However, in the former prior art described above, the degreasing cleaning liquid 112 mixed with the oil together with the oil flows out to the oil disposal chamber 105, and it is difficult to remove only the oil. Since the degreasing cleaning liquid mixed with the oil is injected into the oil separation chamber 104 by the liquid injection pump 107, the oil and the degreasing cleaning liquid in the oil separation chamber 104 are agitated, and the degreasing cleaning liquid and the oil content are stirred. There was a problem that separation could not be performed efficiently, and the degreasing cleaning liquid 112 mixed with oil was returned to the main degreasing tank 100, and the degreasing cleaning liquid used for a certain period was forced to be discarded.

  In the latter prior art described above, either a granular adsorbent or a fibrous adsorbent that forms a zigzag communication path from the lower side to the upper side of the liquid in the first chamber of the container. Oil separation means, such as installing, narrowing the distance between oil molecules to make electrostatic aggregation of oil molecules easy to occur, and making oil molecules large lump and floating above the second chamber due to specific gravity difference There is a problem that the structure is complicated and the cost is increased.

  The present invention has been made to solve the above-mentioned problems. The first object of the present invention is not only to extend the life of the cleaning liquid, but also to adhere oil to degreased metal parts and steel plates. It is providing the oil separation apparatus in the degreasing washing tank which can aim at reduction of the defect by.

  The second object of the present invention is to provide an oil separation method in a degreasing and cleaning tank capable of extending the life of the cleaning liquid.

In order to achieve the first object described above, an oil separation device in a degreasing cleaning tank according to the present invention includes a main degreasing cleaning tank storing an oil mixed degreasing cleaning liquid, and an oil mixing degreasing transferred from the main degreasing cleaning tank. An oil separation apparatus in a degreasing and cleaning tank having an oil separation tank that separates a cleaning liquid into a degreasing cleaning liquid and an oil and discards only the oil by overflow, and is transferred using the first transfer pipe in the oil separation tank When the oil mixed degreasing cleaning liquid reaches an arbitrary specified amount, the first pump stop support means for stopping the first pump for transfer provided in the first transfer pipe, and the oil mixed degreasing cleaning liquid are used as the degreasing cleaning liquid. and with heating to a temperature that completely separated into the oil, a heating means for heat retaining a predetermined time, after a predetermined time elapses, the oil mixture degreasing solution, in order to transfer the oil separation chamber, the first A second pump operation instructing means for operating a second pump that transfers using a second transfer pipe having a discharge port inserted deeper in the oil separation chamber than the discharge port of the feed pipe; The flow rate adjusting means for adjusting the amount of liquid injected into the oil separation chamber so that the separated degreasing cleaning liquid and the oil are not mixed by the jet of the injected liquid, and the oil mixing degreasing cleaning liquid transferred by the second pump when by liquid level overflow only oil content increases the tank are discarded oil disposal chamber, sensor means for sensing the boundary of the separated degreasing solution and oil, sensor means, when having detected boundary The second pump stop instruction means for stopping the second pump, and the recovery means for returning the degreasing cleaning liquid in the oil separation chamber to the main cleaning tank using the siphon principle after stopping the second pump. is there.

  With this configuration, when the oil mixed degreasing cleaning liquid to be poured into the oil separation tank reaches an arbitrary specified amount, heating is performed with the injection stopped and the movement of the oil mixed degreasing cleaning liquid in the separation tank removed. Completely separate the cleaning liquid and oil and fat, inject the oil mixed degreasing cleaning liquid in the main degreasing and cleaning tank little by little, slowly raise the liquid level, overflow only the oil, and discard it. Also, degreasing cleaning liquid and liquid injection The oil-mixed degreasing cleaning liquid added by the above can be returned to the main cleaning tank.

  In this way, not only the oil content is removed from the oil-mixed degreasing cleaning solution, and the degreasing cleaning solution and the oil-mixed degreasing cleaning solution added by the injection are returned to the main cleaning tank, so that the life of the degreasing cleaning solution can be extended and degreased. It is possible to reduce defects caused by oil adhesion on metal parts and steel plates.

In addition, with this configuration, a small amount of degreasing cleaning liquid in the main degreasing cleaning tank is poured into the oil separation tank little by little by driving a liquid injection pump, the liquid level is slowly raised, only the oil is overflowed and discarded, and degreasing cleaning liquid And the oil degreasing cleaning liquid added by the liquid injection can be returned to the main cleaning tank by the principle of siphon without requiring power.

Moreover, in order to achieve said 2nd objective, the oil separation method in the degreasing washing tank which concerns on this invention uses the oil mixed degreasing washing liquid transferred to the oil separation tank from the main degreasing washing tank as a degreasing washing liquid and an oil component. An oil separation method in a degreasing and washing tank that separates and discards only the oil component due to overflow, wherein the oil mixing and degreasing washing liquid transferred using the first transfer pipe in the oil separation tank has an arbitrary specified amount When reaching , the step of stopping the first pump for transfer provided in the first transfer pipe, and heating the oil-mixed degreasing cleaning liquid to a temperature at which the degreasing cleaning liquid and the oil are completely separated; The step of keeping the temperature for a predetermined time and, after the elapse of the predetermined time, in order to transfer the oil mixed degreasing cleaning liquid into the oil separation chamber, the discharge port is inserted deeper in the oil separation chamber than the discharge port of the first transfer pipe. And operating the second pump for transferring was used to the second transfer pipe were, by the transfer of oil mixed degreasing solution according to the second pump, and to overflow only oil content increases the liquid surface of the oil separating tank A step of detecting a boundary between the separated degreasing cleaning liquid and the oil content when being disposed in the oil disposal chamber, and a step of stopping the second pump when the boundary is detected in the step of detecting the boundary; Returning the degreasing cleaning liquid in the oil separation chamber to the main cleaning tank using the siphon principle after stopping the second pump;
It is made to have .

  Therefore, in the oil separation tank, the oil-mixed degreasing cleaning liquid is heated to separate the degreasing cleaning liquid and the oil, and only the oil is removed, and the degreasing cleaning liquid and the oil-mixed degreasing cleaning liquid added by injection are stored in the main cleaning tank. By returning to, the life of the cleaning liquid can be extended.

  According to the oil separation device in the degreasing and cleaning tank according to the present invention, when the oil mixed degreasing cleaning liquid poured into the oil separating tank reaches an arbitrary specified amount, the injection is stopped and the oil mixed degreasing cleaning liquid in the separating tank is removed. Heating is performed in a state where there is no movement, completely separating the degreasing cleaning liquid and the oil and fat, and pouring the oil mixing degreasing cleaning liquid in the main degreasing cleaning tank little by little to slowly raise the liquid level and overflow only the oil. In addition, the degreasing cleaning liquid and the oil-mixed degreasing cleaning liquid added by pouring can be returned to the main cleaning tank.

  In this way, not only the oil content is removed from the oil-mixed degreasing cleaning solution, and the degreasing cleaning solution and the oil-mixed degreasing cleaning solution added by the injection are returned to the main cleaning tank, so that the life of the degreasing cleaning solution can be extended and degreased. It is possible to reduce defects caused by oil adhesion on metal parts and steel plates.

  Further, according to the oil separation method in the degreasing washing tank according to the present invention, the oil mixed degreasing washing liquid is heated in the oil separation tank to be separated into the degreasing washing liquid and the oil, and only the oil is removed, and the degreasing washing liquid and the injection are added. The life of the cleaning liquid can be extended by returning the oil-mixed degreasing cleaning liquid added by the liquid to the main cleaning tank.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory diagram of the configuration of a degreasing and cleaning tank equipped with an oil separation device according to the present invention, and FIG. 2 is a perspective view of the oil separation device equipped with a liquid level monitoring device.

  In FIG. 1, 1 is a main degreasing washing tank, 10 is an oil separation tank installed on the mount 36, 5 is a piping system for supplying a large amount, 8 is a piping system for supplying a small amount, and this small amount is supplied. The piping system 8 constitutes a degreasing cleaning liquid supply / recovery means.

  The oil separation tank 10 includes a tank body 10 </ b> A, and the inside of the tank body 10 </ b> A is partitioned into an oil disposal chamber 31 and an oil separation chamber 33 by an overflow partition plate 32.

  The main degreasing and cleaning tank 1 communicates with the oil separation chamber 33 in the oil separation tank 10 through a large amount supply piping system 5 and a small amount supply piping system 8. That is, the large quantity supply piping system 5 includes a large quantity injection pump 3, a suction pipe 4 A is connected to the suction side of the large quantity injection pump 3, and the discharge side of the large quantity injection pump 3 is The discharge pipe 4B is connected, the suction pipe 4A is inserted into the main degreasing and cleaning tank 1, and the discharge port side of the discharge pipe 4B is inserted into the oil separation chamber 33.

  The small amount supply piping system 8 includes a small amount injection pump 6. A suction pipe 7 A is connected to the suction side of the small amount injection pump 6, and the discharge side of the small amount injection pump 6 is a discharge pipe. 7B is connected, the suction pipe 7A is inserted into the main degreasing cleaning tank 1, and the discharge port side of the discharge pipe 7B is deeper than the discharge pipe 4B of the large quantity supply piping system 5 in the oil separation chamber 33. Has been inserted. The discharge pipe 7B is provided with a flow rate adjusting valve 9.

  The oil separation chamber 33 in the oil separation tank 10 is provided with a liquid level upper limit monitoring device 34 for monitoring the upper limit of the liquid level. As shown in FIG. 2, the liquid level upper limit monitoring device 34 has a float mounting plate 17 fixed to the rear wall portion of the oil separation tank 10A. A plate 18 and a float shaft lower receiving plate 19 are attached vertically, and these float shaft upper receiving plate 18 and float shaft lower receiving plate 19 hold the float shaft 24 so as to be movable up and down. A liquid level monitoring float 25 is attached to the lower end of the float shaft 24. A liquid level monitoring upper block 22 and a liquid level monitoring lower block 23 are vertically attached to the float shaft 24. Further, a liquid level monitoring upper switch 20 and a liquid level monitoring lower switch 21 are vertically mounted on the float mounting plate 17.

  The oil separation chamber 33 is provided with a boundary line detection sensor 35 that detects a boundary line 11 a between the degreasing cleaning liquid 11 and the oil component 12. As shown in FIG. 2, the boundary detection sensor 35 includes a light projecting sensor 15a fixed to the front wall portion of the oil separation tank 10A via a mounting bracket 16a, and a mounting bracket to the rear wall portion of the oil separation tank 10. And a light receiving sensor 15b fixed through 16b.

  Also, in the oil separation chamber 33, a temperature measuring device 14 for measuring the temperature of the oil-mixed degreasing cleaning liquid 2, and heating for heating the oil-mixed degreasing cleaning liquid 2 to 60 ° C., which is the separation point temperature of the degreasing cleaning liquid 11 and the oil 12 A heater 13 as means is provided.

  An oil disposal pipe 26 is attached to the bottom of the oil disposal chamber 31, and an open / close valve 27 is provided on the oil disposal pipe 26. A waste oil tank 29 is disposed below the oil waste pipe 26.

  The gantry 36 is provided with an operation control device 30. On the signal input side of the I / O port of the operation control device 30, a temperature measuring device 14, a liquid level monitoring upper switch 20, a liquid level monitoring lower switch 21, a liquid level upper limit monitoring device 34, and a boundary detection sensor 35 are provided. Are connected to each other by wiring, and a large volume injection pump 3, a small volume injection pump 6, a flow rate adjusting valve 9, a heater 13 and an open / close valve 27 are connected to the signal output side of the I / O port of the operation control device 30. Are connected by wiring.

  Next, the operation of the oil separator in the degreasing and washing tank configured as described above will be described.

  In the initial state, as shown in FIG. 3, the oil-mixed degreasing cleaning liquid 2 is stored in the main degreasing cleaning tank 1. When the operation of the oil separation device is started by the control command of the operation control device 30, as shown in FIG. 4, the large volume injection pump 3 of the large volume supply piping system 5 is operated, and the oil mixed degreasing cleaning liquid 2 enters the suction pipe 4A. The liquid is sucked and sent into the oil separation chamber 33 of the oil separation tank 10 through the discharge pipe 4B.

  When the liquid level of the oil mixture degreasing cleaning liquid 2 rises in the oil separation chamber 33, the float shaft 24 is lifted by the buoyancy of the liquid level monitoring float 25, and the liquid level monitoring upper block 22 provided on the float shaft 24 and the liquid level monitoring The lower block 23 is raised together.

  When the liquid level of the oil mixed degreasing cleaning liquid 2 reaches the upper limit specified, the liquid level monitoring upper block 20 is turned on by the liquid level monitoring upper block 22 to detect the upper limit, and this detection signal is input to the operation control device 30. Then, the operation control device 30 stops the large volume injection pump 3 to stop the supply of the oil mixed degreasing cleaning liquid 2.

  Next, the heater 13 is energized under the control of the operation control device 30, and the heater 13 is the separation temperature of the oil-mixed degreased cleaning liquid 2 stored in the oil separation chamber 33 and the degreasing cleaning liquid 11 and the oil content 12. Heat to ° C.

  At this time, the temperature measuring device 14 measures the temperature of the oil-mixed degreasing cleaning liquid 2, and after the temperature of the oil-mixed degreasing cleaning liquid 2 reaches the specified temperature of 60 ° C., the oil-mixed degreasing cleaning liquid 2 is kept in a warm state. The operation control device 30 is left for a specified time with a timer (not shown). As a result, the oil-mixed degreasing solution 2 is separated into a degreasing solution 11 and an oil component 12, as shown in FIG.

  Next, when the degreasing cleaning liquid 11 and the oil component 12 are separated and a specified time elapses, the small amount injection pump 6 of the small amount supply piping system 8 starts to operate under the control of the operation control device 30 as shown in FIG. The oil-mixed degreasing and cleaning solution 2 in the main degreasing and cleaning tank 1 is sucked by the suction pipe 7A and supplied little by little through the discharge pipe 7B to the bottom side from the separation boundary line of the oil separation chamber 33.

  In order to gradually raise the liquid level so that the separated degreasing cleaning liquid 11 and the oil component 12 are not mixed by the jet of the injected liquid, the flow rate of the injected liquid into the oil separation chamber 33 is adjusted by the flow rate adjusting valve 9. It is possible.

  Then, the liquid level is gradually raised by the operation of the liquid injection pump 6, and the oil component 12 floating on the liquid level is caused to overflow into the oil disposal tank 31. At this time, the boundary line 11a between the degreasing liquid 11 and the oil component 12 is monitored by the light projecting sensor 15a and the light receiving sensor 15b of the boundary line detection sensor 35, and the operation control is performed when the boundary line detection sensor 35 senses the boundary line 11a. The device 30 is activated (the relay is activated), and the small volume injection pump 6 is stopped.

  Next, as shown in FIG. 7, when the small volume injection pump 6 is stopped, the tip position of the discharge pipe 7 </ b> B is mainly higher than the liquid level position of the oil-mixed degreasing cleaning liquid 2 in the degreasing cleaning tank 1. The degreasing cleaning liquid 11 stored in the oil separation chamber 33 and the oil mixed degreasing cleaning liquid 2 injected later by the small amount injection pump 6 pass through the small amount supply piping system 8 and back flow into the main cleaning tank 1. Start.

  The timing at which the reverse flow stops is when the small-volume supply piping system 8 is in a state of sucking air from the discharge piping 7B. In this case, since the liquid level of the oil mixture degreasing cleaning liquid 2 is lowered, the liquid level monitoring float 25 is lowered, and the float shaft 24, the liquid level monitoring upper block 22 and the liquid level monitoring lower block 23 are also lowered. The liquid level monitoring lower block 23 turns on the liquid level monitoring lower switch 21.

  For this reason, the operation of the oil separation device starts again under the control of the operation control device 30, and the above-described operation is repeated.

  Further, as shown in FIG. 8, the opening / closing valve 27 is opened under the control of the operation control device 30, and the oil content 12 accumulated in the oil disposal chamber 31 is discharged to the waste oil tank 29.

  As described above, according to the embodiment of the oil separation device in the degreasing and washing tank according to the present invention, when the oil-mixed degreasing washing liquid 2 poured into the oil separation tank 33 reaches an arbitrary specified amount, the liquid is poured. Is heated in a state where the movement of the oil-mixed degreasing cleaning liquid 2 in the oil separation tank 33 is eliminated, and the degreasing cleaning liquid 11 and the oil 12 are completely separated, and a boundary point 11a between the separated oil 12 and the degreasing cleaning liquid 11 is set. While monitoring with the boundary detection sensor 35, the oil mixture degreasing cleaning liquid 2 in the oil separation tank 33 can be injected little by little with the small volume injection pump 6 to slowly raise the liquid level and overflow only the oil content 12. it can. Further, the degreasing cleaning liquid 11 and the oil-mixed degreasing cleaning liquid 2 added by pouring can be returned to the main cleaning tank 1 by the principle of siphon.

  In this way, only the oil content 12 is removed from the oil degreasing cleaning liquid 2 and the degreasing cleaning liquid 11 and the oil mixed degreasing cleaning liquid 2 added by pouring are returned to the main cleaning tank 1 to extend the life of the degreasing cleaning liquid. In addition, it is possible to reduce defects due to oil adhesion of degreased metal parts and steel plates.

  Further, according to the embodiment of the oil separation method in the degreasing and washing tank according to the present invention, the oil-mixed degreasing and washing liquid 2 is heated in the oil separation tank 33 to be separated into the degreasing and washing liquid 11 and the oil 12 and the oil 12 Only the overflow is removed, and the degreasing cleaning liquid 11 and the oil-mixed degreasing cleaning liquid 2 added by pouring are returned to the main cleaning tank 1, thereby extending the life of the cleaning liquid.

  Alternatively, the tank body 10A may be made of a transparent material so that the inside of the oil separation tank 10 can be seen through. In this case, the separation state of the degreasing cleaning liquid 11 and the oil component 12 inside the oil separation tank 10 can be visually confirmed.

  The oil separator according to the present invention removes only oil from the oil-mixed degreasing cleaning liquid in the oil separation tank, and returns the oil-mixed degreasing cleaning liquid added by the degreasing cleaning liquid and the liquid injection to the main cleaning tank, thereby extending the long life of the degreasing cleaning liquid. It has the effect of reducing defects due to oil adhesion of degreased metal parts and steel plates, and used for the purpose of ease of processing and rust prevention in metal parts and steel plates. It is useful as an oil separator in a degreasing and cleaning tank that removes oil from a degreasing cleaning liquid.

It is composition explanatory drawing of the degreasing washing tank provided with the oil separation apparatus which concerns on this invention. It is a perspective view of the oil separation apparatus provided with the liquid level monitoring apparatus. It is explanatory drawing which shows the initial state by which the oil component mixing degreasing cleaning liquid was stored in the main degreasing cleaning tank. It is explanatory drawing which shows the state by which the oil content mixing degreasing cleaning liquid was sent in the oil separation chamber of an oil separation tank. It is explanatory drawing which shows the state which the oil-component mixing degreasing cleaning liquid stored in the oil separation chamber isolate | separated into the degreasing cleaning liquid and oil. It is explanatory drawing which shows the state by which the oil mixing degreasing washing liquid of a main degreasing washing tank is supplied to an oil separation chamber little by little after degreasing washing liquid and oil part isolate | separate and predetermined time passes. It is explanatory drawing which shows the state which raises a liquid level gradually and overflows the oil component which floats on the liquid level to an oil disposal chamber. It is explanatory drawing which shows the state which the oil component stored in the oil disposal chamber discharges | emits to a waste oil tank. It is structure explanatory drawing of the degreasing washing tank provided with the conventional oil separation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main degreasing cleaning tank 2 Oil mixing degreasing cleaning liquid 3 Large quantity injection pump 5 Large quantity supply piping system 6 Small quantity injection pump 8 Small quantity supply piping system (degreasing cleaning liquid supply and collection means)
9 Flow control valve 10 Oil separation tank 11 Degreasing cleaning liquid 12 Oil content 13 Heating heater (heating means)
DESCRIPTION OF SYMBOLS 30 Operation control apparatus 31 Oil disposal chamber 32 Overflow partition plate 33 Oil separation chamber 34 Liquid level upper limit monitoring apparatus 35 Boundary line detection sensor

Claims (2)

A main degreasing and cleaning tank storing an oil mixed and degreasing cleaning liquid; and an oil separation tank for separating the oil mixed and degreasing cleaning liquid transferred from the main degreasing and cleaning tank into a degreasing cleaning liquid and an oil, and discarding only the oil by overflow. An oil separation device in a degreasing and cleaning tank,
When the oil mixed degreasing cleaning liquid transferred using the first transfer pipe in the oil separation tank reaches an arbitrary specified amount, a first pump for transfer provided in the first transfer pipe is provided. First pump stop support means for stopping;
Heating means for heating the oil-mixed degreasing cleaning liquid to a temperature at which it is completely separated into the degreasing cleaning liquid and the oil, and keeping a predetermined time ;
After the predetermined time has elapsed, in order to transfer the oil-mixed degreasing cleaning liquid into the oil separation chamber, a second transfer pipe having a discharge port inserted deeper in the oil separation chamber than the discharge port of the first transfer pipe is provided. Second pump operation instructing means for operating the second pump to be used and transferred;
A flow rate adjusting means for adjusting the amount of liquid injected from the second transfer pipe to the oil separation chamber so that the separated degreasing cleaning liquid and oil are not mixed by the jet of the injected liquid;
By the transfer of the oil mixture degreasing solution according to the second pump, when it is disposed of only by overflow oil waste chambers before Symbol oil to raise the liquid surface of the oil separating tank, a degreasing solution was the separation Sensor means for sensing the oil boundary;
A second pump stop instruction means for stopping the second pump when the sensor means senses the boundary;
A recovery means for returning the degreasing cleaning liquid in the oil separation chamber to the main cleaning tank using the siphon principle after stopping the second pump;
An oil separation device in a degreasing and cleaning tank. It is an oil separation method in a degreasing and cleaning tank in which an oil mixed degreasing cleaning liquid transferred from a main degreasing cleaning tank to an oil separating tank is separated into a degreasing cleaning liquid and an oil, and only the oil is discarded due to overflow,
When the oil mixed degreasing cleaning liquid transferred using the first transfer pipe in the oil separation tank reaches an arbitrary specified amount, a first pump for transfer provided in the first transfer pipe is provided. A step to stop,
Heating the oil mixture degreasing cleaning liquid to a temperature at which the degreasing cleaning liquid and the oil are completely separated, and keeping the temperature for a predetermined time;
After the predetermined time has elapsed, in order to transfer the oil-mixed degreasing cleaning liquid into the oil separation chamber, a second transfer pipe having a discharge port inserted deeper in the oil separation chamber than the discharge port of the first transfer pipe is provided. Operating a second pump to be used and transferred;
By the transfer of the oil mixture degreasing solution according to the second pump, when it is disposed of only by overflow oil waste chambers before Symbol oil to raise the liquid surface of the oil separating tank, a degreasing solution was the separation Sensing the oil boundary;
In the step of sensing the boundary, stopping the second pump when the boundary is sensed;
Returning the degreasing cleaning liquid in the oil separation chamber to the main cleaning tank using the siphon principle after stopping the second pump;
An oil separation method in a degreasing and cleaning tank characterized by comprising:

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