JP2003011031A - Eco-coping type coolant device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coolant filtering device capable of securing strength of a primary filter and simply treating sludge by filtering dirty liquid having floating micro-sludge in two stages with the primary filter and a secondary filter without excessive filtering load. SOLUTION: Sedimentation sludge S1 settled in a dirty liquid vessel 2 in which a dirty liquid is fed from a machine tool 6 is scraped by a scraper conveyer 10 moving along the bottom 2a of the dirty liquid vessel 2 and discharged to the outside. A cylindrical filter 21 as the primary filter 20 is formed with high strength by a punching metal having pores with a comparatively large bore diameter and little filtering load for passing the micro-sludge. The total quantity of primary clean liquid from the primary filter 20 is immediately supplied as it is to a fine secondary filter 50 by a liquid delivery pump 47, and filtered with high accuracy to be regenerated to a clean liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention filters coolant such as cutting oil and grinding oil used in machine tools to remove mixed foreign matters such as chips and abrasive grains contained in the coolant and reuse the coolant. The present invention relates to a coolant filtration device that is regenerated as much as possible.

[0002]

2. Description of the Related Art In a machine tool such as a cutting machine or a grinding machine, a coolant such as a cutting oil or a grinding oil which has been used to reduce friction of a tool or a work and to cool a processing portion is reused. It has been devised. The coolant discharged from the machine tool is a dirty liquid containing mixed foreign matter (sludge) such as chips and abrasive grains of various sizes generated by machining in the machine tool. The coolant regenerated by removing sludge from the dirty liquid is returned to machine tools and reused. For removing sludge from the coolant, a scraper conveyor or an element exchange type filter is usually used. Filtration accuracy for purifying dirty liquid is set according to the application to which the coolant is supplied. For example, the coolant that has been primarily treated by the scraper conveyor has low filtration accuracy, so it is used for cleaning the bed of the machine and the flow of chips, and the coolant that has been subjected to the secondary filter after the primary treatment has high filtration accuracy. Therefore, it is used as a coolant and high-pressure coolant for machining in the machining section of machine tools.

An example of a conventional filtering device using a scraper conveyor is shown in FIGS. 3 and 4, FIG. 3 is a side view and an AA sectional view showing the outline thereof, and FIG. 4 is shown in FIG. It is a perspective view of a primary filter. As shown in FIG. 3, the main body of the filtering device indicated by reference numeral 1a is placed in the coolant tank 1b. The filtration device 1a includes a dirty liquid tank 2 as a main body case into which the dirty liquid is charged, and an inclined portion 17 extending obliquely upward from the dirty liquid tank 2 in a case shape. One end of the bottom surface 2a of the dirty liquid tank 2 is connected to the slope 18 of the inclined portion 17 and extends upward. The upper end of the inclined extension is located above the liquid level L of the dirty liquid in the dirty liquid tank 2, and the discharge port 3 is formed at this end. Below the discharge port 3, a sludge storage box 4 for receiving the discharged sludge is provided. The dirty liquid discharged from the machine tool 6 such as a cutting machine or a grinder is poured into the dirty liquid tank 2 from the charging port 5 through an oil discharge duct 7 extending from the machine tool 6. Sludge having a relatively large specific gravity (including abrasive grains) in the dirty liquid is precipitated and deposited on the bottom surface 2a of the dirty liquid tank 2 to form settled sludge S1, but light or minute sludge is settled. No floating in dirty liquid.

In order to scrape off the settled sludge S1 accumulated on the bottom surface 2a of the dirty liquid tank 2,
A scraper conveyor 10 is provided. The scraper conveyor 10 is composed of a large number of scrapers 11 (only some of which are denoted by reference numerals) and a pair of left and right chains 12 and 12 arranged in parallel for traveling the scrapers 11. Each scraper 11 has a rectangular plate shape, and its left and right ends are connected to the left and right chains 12 and 12, respectively. The chains 12 and 12 are stretched around a drive sprocket 13 and a driven sprocket 14, and the drive sprocket 13 is driven by a drive motor 15 via a drive chain 16. Accordingly, when the chains 12, 12 are driven by the drive motor 15, each scraper 11 runs while slidingly contacting the bottom surface 2a of the dirty liquid tank 2 to scrape off the settled sludge S1, and further on the slope 18 of the inclined portion 17. Run while sliding the sludge in contact with the sludge S1
The sludge is discharged into the sludge storage box 4.

In the dirty liquid tank 2, a cylindrical filter 21 is provided.
Is provided with a filter device 20. Although only one tubular filter 21 is provided in the drawing, two or more tubular filters may be provided depending on the amount of coolant. As shown in FIG. 4, the cylindrical filter 21 is made of a punching metal 23 having a large number of pores 24 formed on its peripheral wall. At both ends of the tubular shape, the annular end plate 25 is fitted around the hollow support shaft 26 supported by the side wall of the dirty liquid tank 2 by bearings, thereby closing the tubular filter 21 and supporting it. It is rotatably held on the shaft 26.
A sprocket (not shown) is attached to at least one of the end plates 25, and since this sprocket is meshed with the chain 12 of the scraper conveyor 10,
The cylindrical filter 21 is rotated by the chain 12 that travels when the scraper conveyor 10 is driven.

The hollow support shaft 26 opens inside the cylindrical filter 21 through a through hole (not shown) in its peripheral wall. A scraper 27 is arranged in the dirty liquid tank 2 so as to be in sliding contact with the outer peripheral surface of the cylindrical filter 21, and scrapes sludge that blocks the pores 24 of the punching metal 23 to prevent clogging of the punching metal 23. ing. The sludge scraped off by the scraper 27 settles on the bottom surface 2a of the dirty liquid tank 2 and becomes settled sludge S1 which is discharged by the scraper conveyor 10.
The sludge in the dirty liquid is filtered by the tubular filter 21, and the filtered clean liquid flows into the coolant tank 1b through the hollow support shaft 26 from the through hole. The clean liquid in the coolant tank 1b is the cylindrical filter 2
It is a primary clean liquid that has been primarily treated by 1. The liquid level of the primary clean liquid is detected by the liquid level sensor 29.

The minute sludge, which has a relatively small specific gravity and passes through the pores 24 of the punching metal 23 of the cylindrical filter 21, flows into the coolant tank 1b from the dirty liquid tank 2 through the support shaft 26 and floats for a long time. During that time, it precipitates and accumulates as sludge S3. The minute sludge is not completely settled and is suspended in the primary clean liquid, and as a result, the suspended sludge pumps up the clean liquid in the coolant tank 1b to shut off the sluice valve 9
There is a risk that the coolant pump 8 returning to the machine tool 6 will be clogged or troubles such as defective machining of the machine tool 6 will occur. Therefore, it is necessary to frequently clean the inside of the coolant tank 1b or perform a coolant change.
Therefore, there are problems such as an increase in work load and cost. Therefore, the cylindrical filter 2 as a primary filter
In addition to 1, if an additional element exchange type filter is to be further filtered as a secondary filter, the element exchange work of the secondary filter is required, and of course the management and work for that cause the burden on the operator. The cost burden for element replacement increases.

As a method of removing fine sludge, it is conceivable to form the pores 24 of the punching metal 23 of the tubular filter 21 finer. However, if it is attempted to capture fine sludge and improve filtration accuracy, punching will be performed. The pore diameter of the pore 24 formed in the metal 23 is, for example, 0.
It is necessary to reduce the size to about 5 to 0.75 mm. Generally, it is considered difficult to make the diameter of the hole formed in the thin metal plate smaller than the thickness of the thin metal plate due to punching. 0.5m to remove fine sludge
When forming pores having a diameter of about m, the punching metal needs to be thinned to about 0.5 mm, and the strength of the punching metal 23 itself is reduced. When such a punching metal is applied to the tubular filter 21, for example, it becomes difficult for the scraper 27 for preventing clogging to withstand sliding contact with the scraper 27 for a long period of time in terms of strength.
It will be deformed or torn.

[0009]

Therefore, sludge having a relatively large specific gravity contained in the dirty liquid is settled on the bottom of the dirty liquid tank and treated by the scraper conveyor to remove the dirty liquid in which the sludge that cannot be settled floats. A primary filter such as a rolling filter and a secondary filter after that are filtered in two stages, and in the two stages of filtration,
How to supply the primary filter to the secondary filter without causing the burden of filtration on the primary filter and the primary clean liquid containing fine sludge that has passed through the primary filter without causing a situation requiring maintenance such as precipitation or accumulation of fine sludge on the way. There are issues to be solved in terms of devising.

An object of the present invention is to secure the strength that enables the primary filter to be used for a long period of time by not imposing an excessive filtration load on the primary filter when the dirty liquid is filtered in two stages. By devising the method of supplying the primary clean liquid to the secondary filter after passing through,
After the secondary treatment, it regenerates into a highly clean coolant that does not contain fine sludge, prevents the feed pump that pumps the regenerated coolant from clogging with sludge, and prevents problems such as defective machining on machine tools. Furthermore, avoiding the phenomenon that the fine sludge settles or accumulates from the primary clean liquid sent to the secondary filter, there is no need to frequently clean the fine sludge or to perform the coolant liquid refreshing work, It is an object of the present invention to provide a coolant filtering device that can reduce the burden of maintenance work and reduce operating costs.

[0011]

The environment-friendly coolant apparatus according to the present invention scratches sludge deposited on the bottom of the dirty liquid tank in which the coolant mixed with sludge from the machine tool is injected as dirty liquid. Scraper conveyor to take out and discharge to the outside, primary filter installed in dirty liquid tank to filter sludge, send primary clean liquid including fine sludge passed through primary filter and connected to outlet side of primary filter It is composed of a liquid feeding means and a secondary filter for filtering the primary clean liquid fed by the liquid feeding means to regenerate it as a coolant into a reusable secondary clean liquid.

According to this environment-friendly coolant device,
When the dirty liquid containing sludge from the machine tool is put into the dirty liquid tank, the sludge having a relatively large specific gravity is precipitated from the dirty liquid and settles on the bottom surface of the dirty liquid tank to form a settled sludge. The scraper conveyor arranged in the dirty liquid tank scrapes off the settled sludge and discharges it to the outside in the discharging process which moves along the bottom surface of the dirty liquid tank. The primary filter is, for example, a filter for filtering sludge of a predetermined size or larger, such as passing fine sludge, so that the strength is not sacrificed and the eyes are not fined and an excessive filtration load is not imposed. It is possible to have a strength that can be used for a long period of time. Since the entire amount of the primary clean liquid is immediately supplied to the fine secondary filter as it is, the situation in which the primary clean liquid is once stored in the tank and fine sludge is accumulated from the primary clean liquid and maintenance is not required. The dirty liquid is highly accurately filtered by the primary filter and the secondary filter, and is regenerated into a reusable clean liquid.

In this environment-friendly coolant device,
The primary filter may be a rolling filter in which a punching metal having a plate thickness of about 1.0 mm and a large number of holes with a hole diameter of about 1.0 mm is formed into a cylindrical shape. Punching metal plate thickness is approximately 1.0 mm
If there is a considerable strength when molded into a tubular shape, for example, even if a scraper that scrapes off sludge to prevent clogging of punching metal is slidably contacted with the cylindrical outer peripheral surface,
Sufficient strength is secured. Further, the liquid feeding means includes a liquid feeding pipe connected to a hollow support shaft communicating with the cylindrical inside of the rolling filter and an introduction side of the secondary filter, and a liquid feeding pump arranged in the middle of the liquid feeding pipe. Can be prepared. The primary clean liquid that has been filtered by the rolling filter and entered the inside of the cylinder is sucked by the liquid feed pump from the hollow support shaft through the liquid feed pipe and supplied to the secondary filter.

Further, in this environment-friendly coolant device, the secondary clean liquid is stored in the secondary clean liquid tank arranged above the dirty liquid tank, and returned from the secondary clean liquid tank to the machine tool as coolant. It is preferable. By arranging the secondary clean liquid tank on the dirty liquid tank,
The environment-friendly coolant system is compact as a whole, and the piping required from the dirty liquid tank to the secondary clean liquid tank and from the secondary clean liquid tank to the machine tool is minimized, and the manufacturing cost is also reduced. To be done.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of an environment-friendly coolant device. In FIG. 1, the structure of the scraper conveyor itself may be the same as that shown in FIG. 3, and therefore, the same components and parts are denoted by the same reference numerals as in FIG. The description is omitted. Regarding the cylindrical filter which is the primary filter shown in FIG. 2, matters relating to the strength of punching metal,
And the method of sending liquid to the secondary filter is different, as shown in FIG.
It has the same structure as the cylindrical filter shown in FIG.

Referring to FIGS. 1 and 2, in the environment-friendly coolant device 1 according to the present invention, the dirty liquid tank 2 into which the dirty liquid from the machine tool 6 is charged occupies the base of the device. The inclined portion 17 extends obliquely upward on the side. In the dirty liquid tank 2, sludge having a relatively large specific gravity in the dirty liquid precipitates and the bottom surface 2 of the dirty liquid tank 2
deposited on a. The sludge S1 deposited on the bottom surface 2a is
By the scraper conveyor 10, the sludge is discharged from the discharge port 3 to the sludge storage box 4 outside the filtration device through the inclined portion 17. In the dirty liquid tank 2, a coolant filtering device 1 is provided.
The cylindrical filter 21 is arranged as a primary filter.

The cylindrical filter 21 has a structure similar to that of the filter shown in FIG. 4, but a punching metal 23 in which a large number of pores 24 having a hole diameter of 1.0 mm is punched is formed into a cylindrical shape. It is a rolling filter. Since the punching diameter of the pores 24 is a large value of about 1.0 mm, a relatively thick metal sheet having a thickness of about 1.0 mm can be used as the punching metal 23 to be punched. Since the cylindrical filter 21 has a strong structure with secured strength, even if the scraper 27 is slidably contacted and constantly cleaned to prevent the cylindrical filter 21 from being clogged with sludge, The tubular filter 21 does not have a defect due to insufficient strength such as deformation or damage of the punching metal 23. The primary filter 20 can reliably filter sludge according to the diameter of the pores 24 formed in the punching metal 23. However, the pores 2 of the punching metal 23
Since 4 is not a fine hole, fine sludge is not filtered by the cylindrical filter 21.

The liquid feed pipe 28 (see FIG. 2) extending from the hollow support shaft 26 of the cylindrical filter 21 is used as the liquid feed pump 4.
7, a sluice valve 48, and a liquid delivery pipe 49 are connected to a secondary filter 50 that performs secondary processing. Therefore, the primary clean liquid filtered by the primary filter 20 flows into the liquid feeding pipe 28, is completely sucked by the liquid feeding pump 47, and is immediately fed to the secondary filter 50 as it is. Since the primary clean liquid is not stored in the tank before being sent to the secondary filter 50, fine sludge contained in the primary clean liquid is deposited and accumulated in the tank, and maintenance such as removal processing is required. That situation does not occur originally.

The secondary filter 50 is, for example, a high performance filter that does not require elements such as a cyclone filtering device.
The secondary filter 50 filters the fine sludge, and a high filtration accuracy of, for example, about 10 μm can be obtained. Further, since the secondary filter 50 does not require the replacement work of the element, no industrial waste is generated. Secondary filter 50
The coolant filtered in (2) is transferred to the secondary clean liquid tank 52 as the secondary clean liquid through the liquid sending pipe 51.
The concentrated dirty liquid concentrated by the secondary filter 50 is processed by the small settling conveyor 58, and the filtered fine sludge S2 is discharged to the sludge storage box 53. The secondary clean liquid is regenerated coolant that has been filtered with high accuracy, and is sent to the processing section of the machine tool 6 through the coolant pipe 56 as it is by the pump action of the coolant pump 57 and is reused.

The liquid level sensor 54 provided in the secondary clean liquid tank 52 detects the liquid level L2 of the secondary clean liquid in the secondary clean liquid tank 52, and the liquid feed pump 47 and the coolant pump 57. It gives information for driving control. The secondary clean liquid that has overflowed in the secondary clean liquid tank 52 is returned to the dirty liquid tank 2 by the liquid supply pipe 55. Since the secondary clean liquid tank 52 is disposed on the dirty liquid tank 2, the environment-friendly coolant device 1 is compact as a whole, and the pipes also have the dirty liquid tank 2 and the secondary clean liquid. Like the liquid transfer pipes 28, 49 to and from the tank 52 and the coolant pipe 56 from the secondary clean liquid tank 52 to the machine tool 6, necessary piping is suppressed to a minimum length, and a coolant filtering device is provided. 1 contributes to the reduction of manufacturing cost.

In this embodiment, as described above, the dirty liquid in which the sludge is mixed in the coolant is first put into the dirty liquid tank 2, and the sludge which is relatively large and heavy is deposited on the bottom surface 2a to cause the settling sludge. It becomes S1. The cylindrical filter 21 provided in the dirty liquid tank 2 collects sludge drifting in the dirty liquid as a primary filter, and the sludge is scraped off by the scraper 27 and becomes settled sludge S1. These settled sludges S1 are scraped off by the scraper conveyor 10 and discharged from the discharge port 3 to the outside of the filtering device. The entire amount of the primary clean liquid containing fine sludge that has passed through the cylindrical filter 21 without being filtered is immediately fed to the secondary filter 50 by the feed pump 47. The secondary filter 50 filters the primary clean liquid containing fine sludge with high precision, discharges the filtered fine sludge to the outside of the machine, and the obtained secondary clean liquid is used as a reusable reclaimed coolant for machine tools and the like. Is used for.

[0022]

Since the present invention is constructed as described above, it has the following effects. That is, in this environment-friendly coolant device, of the sludge contained in the dirty liquid to be charged into the dirty liquid tank, the sludge having a relatively large specific gravity is precipitated on the bottom surface of the dirty liquid tank to form a settled sludge, It is scraped off in the discharge process of the scraper conveyor and discharged to the outside. The entire amount of the primary clean liquid filtered by the primary filter is immediately supplied to the fine secondary filter as it is, filtered by the secondary filter with high precision, and regenerated into a reusable clean liquid. Therefore,
It is not necessary to impose an excessive filtration burden on the primary filter to filter even fine sludge,
For example, by adopting a punching metal having a relatively large plate thickness, it is possible to form a strong structure having high strength and maintain its life for a long time. In addition, by regenerating highly clean coolant that does not contain fine sludge after secondary treatment, the coolant pump that pumps the regenerated coolant does not become clogged with sludge,
Trouble such as defective machining on machine tools can be prevented. Furthermore, since the primary clean liquid filtered by the primary filter is not stored once in the tank, the situation in which fine sludge is accumulated from the primary clean liquid does not inherently occur, and There is no need for maintenance such as frequent cleaning or liquid coolant change.
The work load is reduced, and the operating costs and management costs can be kept low.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an environment-friendly coolant device.

FIG. 2 is a perspective view showing a part of a primary filter and a liquid feeding means used in the environment-friendly coolant device shown in FIG.

FIG. 3 is a schematic view showing an example of a conventional filtration device.

4 is a perspective view of a primary filter used in the filtering device shown in FIG.

[Explanation of symbols]

1 Environment-friendly coolant system 2 dirty liquid tank 2a bottom 6 machine tools 10 scraper conveyor 11 scrapers 20 Filter device (primary filter) 21 Cylindrical filter (rolling filter) 23 Punching metal 24 pores 26 Support shaft 28 Liquid transfer pipe 47 Liquid feed pump 49 Liquid transfer pipe 50 secondary filter 52 Secondary clean liquid tank S1 Settled sludge S2 micro sludge

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 36/04 B01D 36/04 B24B 55/03 B24B 55/03 F term (reference) 3C011 BB34 3C047 GG00 GG17 4D026 BA01 BB03 BC24 BC26 BD01 BD06 BE01 BE05 BE11 BF20 BF21 BF24 4D066 AA04 AB06 BB22 BB31 FA06

Claims (4)

[Claims] 1. A dirty liquid tank into which a coolant mixed with sludge from a machine tool is injected as dirty liquid, a scraper conveyor for scraping sludge deposited on the bottom of the dirty liquid tank and discharging it to the outside, and a dirty liquid tank. A primary filter that is provided to filter sludge, a liquid feed means that is connected to the outlet side of the primary filter and that sends the entire primary clean liquid containing fine sludge that has passed through the primary filter, and a primary clean liquid that is sent by the liquid feed means. An environment-friendly coolant system consisting of a secondary filter that recycles water to a secondary clean liquid that can be reused as a coolant. 2. The primary filter has a plate thickness of about 1.0 m.
The environment-friendly coolant device according to claim 1, which is a rolling filter in which a punching metal having a number of m and a hole diameter of about 1.0 mm is punched and formed into a cylindrical shape. 3. The liquid feeding means is arranged in the middle of the liquid feeding pipe connected to the hollow support shaft communicating with the cylindrical inside of the rolling filter and the introduction side of the secondary filter, and the liquid feeding pipe. The environment-friendly coolant device according to claim 2, further comprising a liquid feed pump. 4. The secondary clean liquid is stored in a secondary clean liquid tank disposed above the dirty liquid tank, and returned from the secondary clean liquid tank to the machine tool as a coolant. Environmentally friendly coolant device described in.