JP2013006132A - Circulation supply equipment of rolling coolant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circulation supply equipment of rolling coolant, capable of raising cleanness while circulating and flowing the rolling coolant and capable of effectively preventing the generation of flaws such as dents of an article to be rolled caused by foreign matters contained in the coolant.SOLUTION: The circulation supply equipment of the rolling coolant includes an automated cleaning filter 42 having a stock solution flow entrance 56 for flowing in stock liquid of the coolant, a filter for filtering the foreign matters in the stock liquid, a filtrate outlet 58 for flowing out filtrate passing through the filter, and a filter cleaning means for sucking the foreign matter sticking to the filter and discharging the same as drain liquid from a drain discharge port 92, simultaneously performing filter cleaning while continuously filtering the stock liquid. The coolant is fed to the rolling mill 14 via the circulation flow channel 24, the drain liquid of the coolant exiting from a drain discharge port 92 is passed through a centrifugal separator 100 to separate the foreign matters and thereafter is returned to the circulation flow channel 24 and is circulatingly used as the coolant.

Description

  The present invention relates to a circulating supply facility for rolling coolant to a rolling mill, and more particularly, to a device having a feature in means for removing foreign substances contained in the rolling coolant as a dirt substance.

Conventionally, in the process of cold rolling of steel or the like, a rolling coolant is sprayed onto a rolling roll and a material to be rolled for the purpose of cooling and lubrication.
As the rolling coolant in this cold rolling, for example, an emulsion liquid in which about 5 to 20% of oil (about 5% by mass) is added to about 80 to 95% of water and uniformly mixed is used.

In general, the rolling coolant is supplied to the rolling mill in this rolling process as follows.
That is, the rolling coolant discharged from the rolling mill is circulated along the circulation channel, and solid foreign matters contained in the rolling coolant (hereinafter sometimes referred to simply as coolant) are filtered by filtration on the circulation channel. The separated and cleaned coolant is continuously supplied to the rolling mill.

  The coolant from the rolling mill is made of a cloth that removes dirt adhering to the material to be rolled, abrasion powder from the rolled material by rolling, and further removing the coolant liquid in contact with the material to be rolled. There are fiber scraps derived from the pad, and there is installed a filtration device on the circulation flow path to remove foreign matters contained in the coolant, and the cleaned coolant is sent to the rolling mill. .

FIG. 3 shows an example of a conventionally used circulating coolant circulation supply facility.
In the figure, 200 and 202 are rolling rolls in the rolling mill 204 (200 is a working roll, 202 is a backup roll), 206 is a coolant nozzle, and the rolling coolant is directed from the coolant nozzle 206 toward the rolling roll and the material to be rolled. And sprayed.
Reference numeral 220 denotes a cloth pad, which is pressed against the material to be rolled to remove the coolant adhering to the material to be rolled.
Reference numeral 208 denotes a rolling coolant circulation channel, and a storage tank 210 for temporarily storing the rolling coolant is provided on the circulation channel 208.
Here, the storage tank 210 is divided into a dirty tank 210A, an intermediate tank 210B, and a clean tank 210C.

The rolling coolant discharged from the rolling mill 204 first flows into the dirty tank 210A and is stored there.
Then, the rolling coolant in the dirty tank 210A is sent to the flat bed filtration device 212 by a pump.
This flat bed type filtration device 212 uses filter paper as a filter medium (filter), and a filter paper 216 is set in a container 214.

In the filtration device 212, the rolling coolant sent from the dirty tank 210A is filtered by passing through the filter paper 216 to separate and remove foreign substances contained in the rolling coolant.
And the filtrate of the rolling coolant which passed the filter paper 216 flows into the clean tank 210C, and is stored there.

The filtering device 212 causes the filter paper 216 set in the container 214 to be clogged by filtering a large amount of foreign matter, or when the filtering capacity is reduced, the filter paper outside the container 214 is moved leftward in the figure. Then, the filter paper in the container 214 is renewed, and the filter paper newly set in the container 214 is filtered.
When the filter paper outside the container 214 is used up, the entire filter paper is replaced.
The rolling coolant once stored in the clean tank 210C is supplied to the rolling mill 204 through a bag filter 218 on the downstream side by a pump.

  In the circulation supply facility of this example, the filtering device 212 sends the filter paper outside the container 214 to the left in the drawing in the figure, and sets it in the container 214 at every fixed time (every time a constant flow rate is filtered). Update a filter paper. The frequency is about once every 30 minutes, for example, and the required time is about 25 seconds.

When the filter paper outside the container 214 is used up, the entire filter paper is replaced there. The frequency is, for example, about once a week, and the required time is about 30 minutes.
When the filter paper 216 is updated and when the entire filter paper is replaced, naturally, the supply of the coolant in the dirty tank 210A to the filtration device 212 is stopped.

  On the other hand, while the filtering device 212 is stopped, the coolant in the clean tank 210C is continuously supplied to the rolling mill 204, and the used coolant continuously flows out of the rolling mill 204 and enters the dirty tank 210A. Flows in.

As a result, while the amount of coolant in the clean tank 210C decreases, the amount of coolant in the dirty tank 210A continues to increase, and eventually the amount exceeds the capacity of the dirty tank 210A and the coolant in the dirty tank 210A. Overflows into the intermediate tank 210B and further overflows into the clean tank 210C, exceeding the capacity of the intermediate tank 210B.
That is, the dirty coolant flows into the clean tank 210C (the amount of circulating coolant is large, so the tank capacity of the storage tank 210 can be increased within a few minutes due to continuous circulation of rolling coolant. The volume is relatively small to the extent that the entire liquid is renewed).

  The amount of coolant continuously fed to the rolling mill 204, that is, the amount of coolant continuously coming out of the rolling mill 204 is, for example, a large amount of several hundred liters per minute, while the storage tank 210 has a capacity for this. Is small (it is difficult to increase the capacity of the storage tank 210 under various restrictions). Therefore, when the filtration by the filtration device 212 is stopped and the pumping of the coolant in the dirty tank 210A is stopped, As described above, the dirty rolling tank overflows from the dirty tank 210A to the intermediate tank 210B and further to the clean tank 210C.

  For this reason, the tank wall of the clean tank 210C is in a state where dirt is adhered, and at some time, dirt adhering to the tank wall is pumped out together with the filtered coolant liquid in the clean tank 210C, and fine foreign matters are collected. For example, the bag filter 218 may be sent to the rolling mill 204.

Thus, when the coolant containing the foreign material is sent to the rolling mill 204, the foreign material is pressed against the material to be rolled by the rolling roll, so that the material to be rolled is damaged such as a dent due to the foreign material. It can happen.
In particular, in the case of polished steel strips and the like, even a flaw caused by such a fine foreign material (for example, fiber scrap having a thickness of about 0.1 mm) is a big problem.

  As a countermeasure against the problem that coolant containing foreign matter flows into the clean tank 210C, if a filter with a small opening is used as the filter of the bag filter 218, clogging occurs immediately, and the pressure loss at the bag filter 218 is large. As a result, the coolant discharge pressure to the rolling mill 204 is lowered, affecting the rolling quality. For this reason, it is difficult to use a filter having a mesh opening smaller than a certain level, which is a cause of the above problem.

  The problems as described above are caused by the fact that the filtering device 212 has to be stopped for a predetermined time in order to update the filter paper or replace the entire filter paper, and during that time the rolling coolant in the dirty tank 210A is not pumped out. It is.

  In addition, mainly for general industrial water, the following filtration devices having an automatic washing function as a filtration device for separating and removing suspended substances from water, that is, (a) housing and (b) inside the housing A raw water inlet through which raw water containing suspended solids flows, and (c) a filter that is installed inside the housing and passes through the raw water flowing in from the raw water inlet and separates and removes suspended solids from the raw water by filtration. , (D) a filtrate outlet that allows the filtrate of clean water that has passed through the filter to flow out of the housing, and (e) suction that generates a suction flow and sucks suspended substances adhering to the filter surface of the filter together with water. And a filter purifying means for moving the nozzle along the filtration surface of the filter and discharging the water containing the suspended suspended matter as drain water from the drain outlet, and continuously filtering the raw water by the filter However, an automatic washing and filtering apparatus that performs filter purification by the filter purification means is known.

For example, Patent Document 1 below discloses this type of automatic washing and filtering apparatus.
This filtration device has a function of automatically washing the filter while performing continuous filtration, and it is conceivable that the automatic washing filtration device is applied as a rolling coolant filtration device.
However, this automatic cleaning filtration device is a device for separating from the filter and discharging foreign matter (dirt) sucked into the suction nozzle as drain water together with water from the drain discharge port and disposing of it as a rolling coolant filtration device. When used, the disposal of the drainage costs enormously, and a large amount of coolant discharged as drainage must be newly supplied to the circulation flow path, which can be used as a coolant filtration device. It is difficult to apply.

JP 2004-141785 A

  The present invention, against the background of the above circumstances, can improve the cleanliness of the rolling coolant while circulating and circulating the circulating coolant along the circulation flow path, and is caused by foreign matters contained in the rolling coolant supplied to the rolling mill. The object of the present invention is to provide a circulating supply facility for rolling coolant that can effectively suppress the occurrence of scratches such as dents in the rolled material.

  Thus, in the first aspect of the invention, the rolling coolant containing oil and water ejected from the rolling mill and sprayed on the rolling roll and the material to be rolled for the purpose of cooling and lubrication is circulated along the circulation channel. A circulating supply facility for rolling coolant that separates solid foreign matter contained in the coolant as a dirt substance on the circulation flow path by filtration and supplies the cleaned coolant to the rolling mill, comprising: (a) a housing; (B) a stock solution inlet through which the coolant stock solution containing the foreign matter flows into the housing; and (c) a stock solution which is installed inside the housing and passes through the stock solution inlet and passes through the stock solution. A filter that separates and removes foreign matter by filtration; (d) a filtrate outlet that allows the filtrate of the clean coolant that has passed through the filter to flow out of the housing; and (e) that generates a suction flow to generate the suction flow. fill Filter purifying means for moving the suction nozzle that sucks the foreign matter adhering to the filtration surface of the filter together with the coolant along the filtration surface of the filter, and discharging the coolant containing the sucked foreign matter as a drain liquid from the drain discharge port; An automatic cleaning filtration device that performs filter purification by the filter purification means in parallel while performing continuous filtration of the stock solution by the filter, and includes the foreign matter from the rolling mill. The automatic storage in the circulation channel, wherein the coolant is stored in a dirty tank forming a part of the circulation channel, and the coolant in the dirty tank passes from the raw solution inlet to the filtrate outlet through the filter. After circulating the internal flow path of the washing filtration device, through the external flow path of the circulation flow path from the filtrate outlet to the rolling mill A drain liquid which is supplied to a rolling mill, and provided with a return flow channel connecting the drain discharge port and the circulation flow channel, and the drain liquid discharged from the drain discharge port is provided in the return flow channel. It is characterized in that the drain liquid is passed through a processing machine to separate foreign matter and then returned to the circulation flow path to be circulated and used as the coolant.

  According to a second aspect of the present invention, in the first aspect, the drain liquid processing machine is a centrifuge that centrifuges foreign matter in the drain liquid.

  According to a third aspect of the present invention, in any one of the first and second aspects, the filter purification unit includes an injection nozzle that injects the filtrate of the coolant that has passed through the filter onto the filter, and the suction nozzle and the injection nozzle Are transferred along the filter as a set.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a clean tank is provided in the external flow path from the filtrate outlet to the rolling mill, and the coolant discharged from the filtrate outlet is It is characterized in that it is stored once in a clean tank and then supplied from the clean tank toward the rolling mill.

Effects and effects of the invention

  As described above, the present invention includes a housing, a raw solution inlet, a filter, a filtrate outlet, and a filter purification means as a rolling coolant filtration device, and performs continuous filtration of the raw solution using the filter. , Using an automatic cleaning filtration device that performs filter purification by the filter purification means in parallel, and storing the coolant containing foreign matter from the rolling mill in the dirty tank and removing the coolant in the dirty tank of the automatic cleaning filtration device. After circulating the internal flow path of the automatic washing filtration device in the circulation flow path from the raw liquid flow inlet to the filtrate flow outlet through the filter, through the external flow path of the circulation flow path from the filtrate flow outlet to the rolling mill While being supplied to the rolling mill, the drain liquid discharged from the drain outlet was passed through the drain liquid processing machine, and the drain liquid was subjected to a separation process of foreign matter. It returned to the circulation passage through the return flow path, in which none to recycled as coolant.

In the present invention, the filtration device has a function of removing the foreign matter adhering to the filter by automatically removing the filter from the filter while performing continuous filtration, so that the coolant is circulated to the rolling mill. There is no need to temporarily stop the filtration device when supplying.
Accordingly, it is possible to solve the problem that the amount of coolant in the dirty tank continues to increase due to the stop of the filtration device and overflows from the dirty tank.

  Further, when the clean coolant discharged from the filtration device according to claim 4 is once stored in the clean tank and then supplied from the clean tank to the rolling mill, the clean tank and the dirty as in the conventional equipment of FIG. Even when the tank is divided into one storage tank, dirty coolant in the dirty tank can be prevented from flowing into the clean tank, and the clean tank can always be kept clean. it can.

  Therefore, when supplying the coolant in the clean tank to the rolling mill, clean coolant from which foreign matters have been well removed can be supplied to the rolling mill, the foreign matter is pushed into the material to be rolled by the rolling roll, and dents etc. The generation of scratches can be effectively suppressed.

  In the present invention, the drain liquid discharged from the drain discharge port of the automatic washing and filtering device is not disposed of, but is passed through a drain liquid processing machine provided on the return flow path and subjected to a separation process of foreign matters with respect to the drain liquid. It is characterized in that it is returned to the road and circulated as coolant.

  In the present invention, in addition to not causing a problem that a large amount of cost is required for disposal for drain liquid disposal, it is necessary to continuously replenish the circulation flow path with a large amount of coolant discharged as drain liquid. Nor.

  In the present invention, a centrifuge for centrifuging foreign matter in the drain liquid can be preferably used as the drain liquid processing machine.

  Further, the filter purifying means in the above automatic washing and filtering apparatus includes an injection nozzle that injects coolant filtrate that has passed through the filter onto the filter, and the suction nozzle and the injection nozzle are moved along the filter as a set. (Claim 3).

  According to a fourth aspect of the present invention, a clean tank is provided on an external flow path from the filtrate outlet to the rolling mill in the automatic washing and filtering device, and the coolant discharged from the filtrate outlet is temporarily stored in the clean tank, and then the clean tank is turned into the rolling mill. According to the fourth aspect of the present invention, the rolling coolant stored in the clean tank for a certain period of time can be supplied to the rolling mill even if the automatic washing / filtering device breaks down. Can continue to supply towards

It is the whole figure which showed the circulating supply equipment of the rolling coolant which is one Embodiment of this invention. It is the figure which showed the automatic washing | cleaning filtration apparatus in FIG. It is the figure which showed the prior art example of the circulating supply equipment of rolling coolant.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 and 12 are rolling rolls (10 is a working roll and 12 is a backup roll) in a rolling mill (cold rolling mill) 14.
Reference numeral 16 denotes a coolant nozzle. From this coolant nozzle, an emulsion state rolling coolant containing water and oil (hereinafter simply referred to as coolant) is sprayed toward the rolling roll and the material to be rolled 18 for the purpose of cooling and lubrication. .
In this example, the coolant is a liquid containing 95% water and 5% oil (both mass%).

Reference numeral 20 denotes a cloth pad that is pressed against the material to be rolled 18 and removes the coolant adhering to the material to be rolled 18 from the material 18 to be rolled.
Reference numeral 22 denotes a receiver that receives coolant from the rolling mill 14.
Reference numeral 24 denotes a circulation passage that circulates the coolant discharged from the rolling mill 14 and supplies the coolant again to the rolling mill 14. Reference numeral 26 denotes a storage tank provided in the circulation passage 24.

The storage tank 26 is provided in the basement, and the inside is divided into a dirty tank 26A, an intermediate tank 26B, and a clean tank 26C.
The storage tank 26 is the same as the storage tank 210 shown in FIG. 3 that has been used conventionally, and has the same internal capacity.
Here, the capacity of the storage tank 26 is about 6000 L (liters), and it is divided into three to form a dirty tank 26A, an intermediate tank 26B, and a clean tank 26C.

In this example, the coolant discharged from the rolling mill 14 flows into the dirty tank 26 </ b> A of the storage tank 26 through the flow path 28, is temporarily stored therein, is pumped out from there by the pump 40, and is automatically cleaned through the flow path 30. The foreign matter contained as a contaminant in the coolant is removed by filtration, and the filtrate after filtration, that is, the purified coolant flows into the clean tank 26C of the storage tank 26 through the flow path 32. And is temporarily stored there.
The automatic washing and filtering device 42 will be described later.

The coolant stored in the clean tank 26 </ b> C is pumped out by the pump 44 and supplied again to the rolling mill 14 through the flow path 34.
The flow path 34 is provided with a bag filter 46, and the coolant pumped from the clean tank 26 </ b> C passes through the bag filter 46 and is sent to the rolling mill 14.
Here, the bag filter 46 is configured by arranging a primary side filter and a secondary side filter in series. The primary side filter has a mesh opening of 25 to 100 μm, and the secondary side filter is a secondary side filter. The one having an opening of 10 to 50 μm is used.
When the rolling mill 14 is stopped, the three-way valve 48 provided in the flow path 34 is switched to the flow path 36 side, and the coolant pumped from the clean tank 26C flows from the flow path 34 to the flow path 36. It is returned again to the clean tank 26C.

FIG. 2 shows the configuration of the automatic cleaning filter 42.
The automatic washing and filtering device 42 has a housing 50, and a coarse filter 52 having a cylindrical shape and a fine filter 54 having a cylindrical shape are arranged in the axial direction.
The coarse filter 52 separates and removes coarse solids by filtration. Here, the coarse filter 52 is made of punching metal.
On the other hand, the fine filter 54 removes fine foreign matters contained in the coolant stock solution as a dirt substance by filtration, and is made of a metal mesh member here.
The fine filter 54 has a mesh opening of about 10 to 500 μm, and in particular, a fine filter of 25 μm is used here.
The left end of the coarse filter 52 in the drawing and the right end of the fine filter 54 in the drawing are closed by shielding plates 60 and 62, respectively.

In this embodiment, a coolant stock solution containing dirt substance or foreign matter in the dirty tank 26A flows into the housing 50 in a pressurized state by the pump 40 of FIG. 1 from a stock solution inlet 56 provided in the housing 50.
The coolant stock solution that has flowed in flows through the coarse filter 52 from the outside to the inside, where primary filtration is performed. That is, coarse solids contained in the coolant stock solution are removed there.

The stock solution that has flowed into the coarse filter 52 subsequently moves in the right direction in the figure as indicated by the arrow in FIG. 2, flows into the fine filter 54, and then flows through the fine filter 54 from the inside to the outside. Therefore, secondary filtration is performed on the stock solution.
That is, fine foreign matters contained in the stock solution are filtered by the fine filter 54, and the filtrate that has passed through the fine filter 54, that is, the cleaned coolant flows out from the filtrate outlet 58, and the clean tank 26C in FIG. Flows into.

  64 is a dirt collector pipe extending in the horizontal direction (axial direction) in the drawing at the center of the coarse filter 52 and the fine filter 54. The dirt collector pipe 64 includes nozzle members at two different locations in the axial direction. 66 are integrally rotated in directions different from each other by 180 °.

  The dirt collector pipe 64 has a double pipe structure having an outer pipe and an inner pipe, and a flow path for the filtrate is circulated inside the inner pipe, and a drain liquid is circulated between the outer pipe and the inner pipe. A drain flow path is formed.

  On the other hand, the nozzle member 66 has a nozzle hole that communicates with the drain channel, and is provided with a suction nozzle that sucks foreign matter adhering to the inner surface of the fine filter 54, and further, at a rear position in the rotation direction of the suction nozzle, An injection nozzle which has a nozzle hole communicating with the flow path of the filtrate and injects the filtrate onto the inner surface of the fine filter 54 is provided.

  Reference numeral 80 denotes a motor that rotates the pair of nozzle members 66 together with the dirt collector pipe 64, and 82 denotes a piston that moves the pair of nozzle members 66 along the dirt collector pipe 64 in the left-right direction, that is, the axial direction. That is, each of the pair of suction nozzles and spray nozzles provided in them moves in the horizontal direction in the figure while spirally moving the inner surface of the fine filter 54 by rotation by the motor 80 and axial movement by the piston 82.

A communication pipe 84 communicates the filtrate chamber 86 formed on the outer side of the fine filter 54 with one end (left end in the figure) in the axial direction of the flow path of the filtrate formed on the inner side of the six inner pipes. An injection pump 88 is provided on the communication pipe 84.
Reference numeral 90 denotes a drain chamber formed on the right side of the partition plate 62 that closes the right end of the fine filter 54 in the drawing, 92 is a drain discharge port, and 94 is a drain valve provided in the drain discharge port 92.

In the automatic washing and filtering apparatus 42 shown in FIG. 2, the coolant stock solution sent in a pressurized state by the pump 40 of FIG. 1 is introduced into the housing 50 from the stock solution inlet 56.
The coolant stock solution that has flowed in is first filtered through the coarse filter 52 from the outside to the inside, and further filtered through the fine filter 54 from the inside to the outside, and the filtrate or purified. Coolant flows out from the filtrate outlet 58.

The automatic washing and filtering device 42 performs filter purification for removing foreign substances adhering to the inner surface of the fine filter 54 while performing continuous filtration on the coolant stock solution.
Specifically, the drain valve 94 of the drain discharge port 92 is opened to rapidly reduce the pressure in the drain chamber 90, and suction is performed by the suction nozzle due to the pressure difference between the stock solution inside the fine filter 54 and the drain chamber 90. A flow is generated, and by the suction flow, the foreign matter adhering to the inner surface of the fine filter 54 is separated from the fine filter 54 and sucked into the suction nozzle.
Then, the stock solution of the coolant containing the sucked foreign material is used as a drain liquid, is circulated through the drain flow path inside the dirt collector pipe 64, is sent to the drain chamber 90, and is further discharged from the drain chamber 90 through the drain discharge port 92.

In addition, the injection pump 88 is operated together with the suction by the suction nozzle, the filtrate in the filtrate chamber 86 is sent to the filtrate flow path inside the inner tube of the dirt collector pipe 64 through the communication pipe 84, and the fine filter from the injection nozzle. The fine filter 54 is washed by injecting the filtrate toward the inner surface of the fine filter 54.
In this embodiment, the cleaning nozzle (suction / injection), the dirt collector pipe 64, the motor 80, the piston 82, the communication pipe 84, the injection pump 88, the drain discharge port 92, the drain valve 94, etc. constitute the filter purification means. .
The purification of the fine filter 54 can be performed continuously, but here it is performed at regular intervals, for example, once every 15 minutes. The flow rate of the drain liquid generated at that time is, for example, 200 L (liter) / min.

  In addition, this kind of automatic washing filtration apparatus is a well-known thing disclosed by patent document 1 etc. as filtration apparatuses, such as general industrial water, and is also marketed.

However, in this type of conventional automatic washing and filtering apparatus, the drain liquid discharged from the drain discharge port 92 is discarded, but here, the drain liquid discharged from the drain discharge port 92 is circulated and used as a coolant.
That is, the drain liquid of the coolant containing the foreign matter that has come out of the drain discharge port 92 is once drain tank through the return flow path 38 that connects the drain discharge port 92 and the circulation flow path 24, specifically, the dirty tank 26A that forms a part thereof. After being stored in 96, it is sent to a centrifugal separator (drain liquid processing machine) 100 by a pump 98, where foreign matter is separated into solid and liquid and removed from the drain liquid, and the drain liquid from which foreign matter is removed, that is, The coolant is returned to the dirty tank 26 </ b> A of the storage tank 26.
Here, the return channel 38 can also be considered as a branch channel in the circulation channel 24. That is, the coolant circulates through the circulation passage 24 through the return passage 38.
The coolant returned to the dirty tank 26A through the return flow path 38 is then supplied again from the dirty tank 26A to the stock solution inlet 56 of the automatic washing filter 42.

That is, after the recovered drain liquid is separated into solid and liquid, it is returned to the circulation flow path 24 as it is without being discharged out of the circulation system and circulated and used as a coolant for the rolling mill 14.
Therefore, in the coolant circulation supply facility of this embodiment, it is not necessary to supply a large amount of new coolant to the circulation flow path 24 due to drainage and disposal of the drain liquid.

In this embodiment, the automatic washing and filtering device 42 allows the coolant stock solution to flow in at a flow rate of 600 to 800 L (liter) / minute, and normally flows the filtered coolant in the same amount from the filtrate outlet 58.
Accordingly, clean coolant that has been cleaned at a rate of 600 to 800 liters per minute constantly flows into the clean tank 26C.

On the other hand, the coolant pumped from the clean tank 26C toward the rolling mill 14 is 400 to 500 liters per minute, and the difference is 200 to 300 liters.
The difference, that is, the excessive amount of coolant overflows from the clean tank 26C and flows into the adjacent intermediate tank 26B, and further overflows the intermediate tank 26B and flows into the dirty tank 26A.
That is, during normal times, the coolant flows from the clean tank 26C to the intermediate tank 26B and further to the dirty tank 26A at a rate of 200 to 300 liters per minute.

Then, 200 to 300 liters of coolant flowing from the clean tank 26C through the intermediate tank 26B to the dirty tank 26A every minute together with the coolant flowing in from the rolling mill 14 at a rate of 400 to 500 liters per minute, a total of 600 to A quantity of 800 liters is sent to the side of the automatic washing and filtering device 42 where the coolant is purified.
That is, in this embodiment, in the storage tank 26, the coolant always flows from the clean tank 26C to the intermediate tank 26B, and further from the intermediate tank 26B to the dirty tank 26A.

  Accordingly, the coolant containing the foreign matter in the dirty tank 26A does not flow into the clean tank 26C via the intermediate tank 26B, and therefore the clean tank 26C is always kept clean.

Note that when the fine filter 54 is intermittently purified in the automatic washing and filtering device 42, the coolant is drained and discharged in a certain amount, and accordingly, the clean tank is passed through the flow path 32 from the filtrate outlet 58. The amount of coolant flowing into 26C is reduced.
The reduced amount flows into the dirty tank 26 </ b> A through the flow path 38, and then flows into the automatic washing and filtering device 42 side through the flow path 30.

In the present embodiment as described above, the automatic cleaning and filtering device 42 performs continuous filtration, and the foreign matter adhering to the fine filter 54 is automatically peeled off from the fine filter 54 by the filter purification means and removed. Therefore, it is not necessary to temporarily stop the filtration device 42 when the coolant is circulated and supplied to the rolling mill 14.
Therefore, the amount of the coolant in the dirty tank 26A continues to increase due to the stop of the filtering device 42, and it does not overflow from the dirty tank 26A and flow into the clean tank 26C via the intermediate tank 26B. Rather, the coolant flows from the clean tank 26C to the dirty tank 26A. Therefore, according to the present embodiment, the clean tank 26C can always be kept clean.

  Therefore, when the coolant in the clean tank 26C is supplied to the rolling mill 14, clean coolant from which foreign matters have been well removed can be supplied to the rolling mill 14, and the foreign matter is pushed into the material to be rolled 18 by the rolling roll, and the material to be rolled. It is possible to effectively suppress the generation of scratches such as dents in the 18.

  In addition, according to the present embodiment, in addition to not causing a problem that a large amount of cost is required for disposal for drain liquid disposal, a large amount of coolant discharged as drain liquid is continuously supplied to the circulation flow path 24. There is no need to replenish.

  In the above, the clean coolant discharged from the automatic washing and filtering device 42 is once stored in the clean tank 26C and then pumped from the clean tank 26C to the rolling mill 14 for supply. It is also possible to configure the coolant circulation supply equipment so that the clean coolant discharged from the cleaning filtration device 42 is directly supplied to the rolling mill 14 without passing through the tank as it is.

In the above example, the drain liquid from the drain discharge port is returned to the dirty tank. However, it may be returned to the intermediate tank in some cases, and in the present invention, disclosed in Patent Document 1 as an automatic washing filtration device. Thus, it is possible to use one having a backwashing function for injecting the filtrate inward from the outer surface of the fine filter 54 or one that only performs suction by the suction nozzle, and the above-mentioned examples of the coolant The present invention can also be applied to cases where a composition other than the composition described above is used.
Furthermore, although the centrifuge is exemplified as the drain liquid processing machine, other types of separators can be used, and the present invention can be configured in various modifications without departing from the spirit thereof. .

10 Working roll (rolling roll)
12 Backup roll (rolling roll)
DESCRIPTION OF SYMBOLS 14 Rolling machine 18 Rolled material 24 Circulation flow path 26 Storage tank 26A Dirty tank 26C Clean tank 28, 30, 32, 34, 36, 72 Flow path 38 Return flow path 42 Automatic washing filter apparatus 50 Housing 52 Coarse filter 54 Fine filter 56 Stock solution inlet 58 Filtrate outlet 92 Drain outlet 100 Centrifuge

Claims (4)

Rolling coolant containing oil and water sprayed from the rolling mill and the material to be rolled for the purpose of cooling and lubrication and circulating from the rolling mill is circulated along the circulation flow path, and the coolant is contaminated on the circulation flow path. It is a circulating supply facility for rolling coolant that separates solid foreign substances contained as substances by filtration and supplies the cleaned coolant to the rolling mill,
(a) a housing; (b) a stock solution inlet through which the coolant stock solution containing the foreign matter flows into the housing; and (c) a stock solution that is installed inside the housing and flows from the stock solution inlet. A filter through which foreign substances in the stock solution are separated and removed by filtration; (d) a filtrate outlet for allowing the clean filtrate of the coolant that has passed through the filter to flow out of the housing; and (e) a suction flow The suction nozzle that sucks the foreign matter adhering to the filtration surface of the filter together with the coolant is moved along the filtration surface of the filter, and the coolant containing the sucked foreign matter is discharged as a drain liquid from the drain discharge port. Filter purification means for performing the filter purification by the filter purification means while performing continuous filtration of the stock solution by the filter. Have automatic washing and filtration equipment
The coolant containing the foreign matter from the rolling mill is stored in a dirty tank that forms a part of the circulation flow path, and the coolant in the dirty tank is passed through the filter from the stock solution inlet to the filtrate flow. After passing through the internal flow path of the automatic washing and filtering device in the circulation flow path to the outlet, supply to the rolling mill through the external flow path of the circulation flow path from the filtrate outlet to the rolling mill While trying to do
A return flow path that connects the drain discharge port and the circulation flow path is provided, and the drain liquid discharged from the drain discharge port is passed through a drain liquid processing machine provided in the return flow path, so that the drain liquid is An apparatus for circulating and supplying a rolled coolant, wherein the coolant is returned to the circulation flow path after being subjected to a foreign matter separation process, and is circulated and used as the coolant.   2. The circulating supply facility for rolling coolant according to claim 1, wherein the drain liquid processing machine is a centrifuge for centrifuging foreign matter in the drain liquid.   3. The filter purifier according to claim 1, wherein the filter purification unit includes an injection nozzle that injects the coolant filtrate that has passed through the filter onto the filter, and the suction nozzle and the injection nozzle are combined into the filter. A circulating supply facility for rolling coolant, characterized in that it is to be moved along.   In any one of Claims 1-3, the said external flow path from the said filtrate outlet to the said rolling mill was equipped with a clean tank, and the said coolant which came out of this filtrate outlet was once stored in this clean tank. A circulating supply facility for rolling coolant, characterized in that it is supplied from the clean tank toward the rolling mill.

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