JPH09824A - Filter apparatus - Google Patents

Abstract

PURPOSE: To provide a filter apparatus using no large sedimentation tank, reduced in installation space and requiring no complicated work such as cleaning or repairing. CONSTITUTION: A separation tank 1 is provided with a scraper conveyor 10 and cylindrical filters 21, 22 therein and foreign matter in the dirty liquid housed in the separation tank 1 is sedimented on the bottom surface 2 of the separation tank 1 to be discharged from a discharge port 3 while scraped off by the scraper conveyor 10 and the non-sedimented mixture in the dirty liquid is filtered by the cylindrical filters 21, 22 and the filtrate is directly supplied to a machine tool by a supply pump 41 without being passed through a sedimentation tank. Therefore, a special sedimentation tank becomes unnecessary and the whole of the filter apparatus becomes small and the work cleaning the foreign matter deposited in the sedimentation tank becomes unnecessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention removes mixed foreign matter such as chips and abrasives from cutting oil and grinding oil used in machine tools and recycles the cutting oil and grinding oil so that they can be reused. The present invention relates to a filtration device that is returned to a machine tool.

[0002]

2. Description of the Related Art In factories and the like, it is devised to reuse cutting oil and grinding oil used in machine tools. That is, since foreign substances such as chips and abrasive grains are mixed in the cutting oil and the grinding oil, if the mixed foreign substances are removed, the cutting oil and the grinding oil can be returned to the machine tool and reused. A filtering device has been conventionally used to remove such mixed foreign matter.

For example, as a conventional filtration device, the present inventor has already developed the filtration device disclosed in Japanese Utility Model Publication No. 4-33929. This product introduces dirty liquid such as cutting oil and grinding oil containing foreign matter such as chips and abrasives used in machine tools to a separation tank, and precipitates the foreign matter in this separation tank. . The separation tank is inclined so that one end of the bottom surface is above the liquid level, a discharge port is formed at this inclined end, and a scraper conveyor is installed, and this scraper conveyor is The foreign matter settled on the bottom surface is scraped off, carried to the discharge port, and discharged to the outside through this discharge port.
In addition, a cylindrical filter is installed in the separation tank, and the foreign matter floating in the dirty liquid without being completely settled in the separation tank is filtered by this cylindrical filter. Are configured to separate.

[0004]

By the way, in the conventional case, a large-sized settling tank (referred to as a clean tank) 10 as shown by an imaginary line in FIG.
0 is connected, and this tank 100 for precipitation temporarily stores the clean liquid filtered by passing through the cylindrical filter and precipitates fine foreign matters that cannot be removed by the cylindrical filter. I was doing too much. Then, a supply pump 101 is installed at the downstream end of the precipitation tank 100, and the clean liquid is supplied to the machine tool by the pump 101.

However, the precipitation tank 100 having such a structure requires a large installation space, and the area occupied in the factory becomes large, which is an obstacle. Further, in such a precipitation tank 100, fine foreign matters settle and accumulate, so that it is necessary to regularly remove the foreign matters. This removal work, that is, the cleaning work, is a work that is troublesome and troublesome because the operation of the filtration device is stopped, the filtrate in the precipitation tank 100 is drained, and the sediment accumulated at the bottom of the tank 100 is removed. Is. Such troublesome work is neglected anyway, and if you do not clean this sedimentation tank,
There is a problem in that the precipitated foreign matter will rot and the working environment will deteriorate significantly. Further, if such a precipitated foreign matter is sucked into the supply pump 101, the pump will be clogged, and there is a problem that cleaning and repairing this pump takes a lot of time and money.

The present invention has been made in view of the above circumstances. The object of the present invention is to eliminate a large settling tank, save a small space, and clean the settling tank and supply pump. It is intended to provide a filtering device that does not require troublesome work such as repair.

[0007]

In order to achieve the above object, the invention of claim 1 introduces a contaminated liquid used in a machine tool and is inclined so that one end of the bottom surface is above the liquid surface,
A separation tank having a discharge port formed at this inclined end; a scraper conveyor that slides along the bottom wall of the separation tank to scrape the foreign matter and remove it from the discharge port; in the liquid of the separation tank A filter provided on the machine; and a supply pump that sucks the filtered liquid that has passed through the cylindrical filter (without passing through the precipitation tank) and supplies it to the machine tool. Is.

[0008]

According to the invention of claim 1, the filtrate filtered through the tubular filter is directly supplied to the machine tool by the supply pump without passing through the precipitation tank. Therefore,
No special settling tank is required, the entire filtration device is small, and the installation space is small. In this case, since the fine mixed foreign matter is sent out to the machine tool together with the filtrate, the supply pump will not be blocked.

Here, the supply pump of claim 1 directly sucks the filtered liquid filtered by the cylindrical filter without passing through the sedimentation tank and supplies it to the machine tool. There is no problem in using a small pump tank for the suction part of the pump.

The cylindrical filter is a punching plug.
, A wedge wire, a polyamide (nylon) mesh, or the like may be used, and the cylindrical filter may or may not be rotationally driven. Then, the cylindrical filter may be configured such that the foreign matter captured on the outer surface is scraped with a scraper or backwashed with a clean liquid or air.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on a first embodiment shown in FIGS. The drawing shows a filtering device for cutting oil used for cutting aluminum products, in which 1 is a separation tank. Separation tank 1
One end of the bottom surface 2 is inclined and extends upward, and the extended upper end is located above the liquid surface, and a discharge port 3 is opened at this end. A chip storage box 4 is provided below the discharge port 3.

At the other end of the separation tank 1, a charging port 5 is opened on the upper surface thereof, and a discharging oil duct 7 extending from a cutting machine 6 is connected to the charging port 5. The cutting oil used in the cutting machine 6 is introduced into the separation tank 1 from the input port 5 via the oil discharge duct 7. Various cutting chips of various sizes are mixed in this cutting oil, and when such cutting oil mixed with foreign matter is introduced into the separation tank 1,
Relatively large chips and heavy chips are settled and deposited on the bottom surface 2 of the separation tank 1.

The separation tank 1 has a scraper conveyor 10
Is provided. The scraper conveyor 10 is composed of a large number of scrapers 11 ... And a pair of left and right scraper chains 12 for moving the scrapers 11 ... The scrapers 11 ... Are formed in a rectangular plate shape with oil-resistant rubber, and the left and right ends are connected to the left and right scraper chains 12.

The scraper chain 12 is stretched between a drive side sprocket 13 and a driven side sprocket 14, and the drive side sprocket 13 is driven by the drive motor 1.
Driven by drive chain 5 via drive chain 16.

Therefore, the pair of scraper chains 1
2 runs, the scrapers 11 ...
While sliding on the bottom surface 2 of the, the foreign matter such as chips accumulated on the bottom surface 2 is scraped off and carried to the discharge port 3. Outlet 3
The foreign matter that has been scraped by the shavings falls from the discharge port 3 into the chip storage box 4.

A filter device 20 is provided in the separation tank 1.
Is installed. The filter device 20 is shown in FIGS.
The filter device 20 of this embodiment includes two tubular filters 21 and 22.

These cylindrical filters 21 and 22 are made of punching metal, for example, and have a large number of pores 23 ... Formed in their side walls. Both end portions of such tubular filters 21, 22 are closed by end plates 24, 24, and the tubular shape is maintained by these end plates 24, 24. These end plates 24, 24 are rotatably attached to a support shaft 26 via bearings 25, 25. Then, the end plate 24,
The sprocket 27 is attached to one side of the 24, and the sprocket 27 is the scraper chain 1
2 is engaged. That is, when the scraper chain 12 on the outward path runs, the sprocket 27 meshed with the scraper chain 12 is rotated, so that the tubular filter 2
1, 22 are adapted to be rotated.

The support shaft 26 that supports the cylindrical filters 21 and 22 is formed of a hollow pipe, and both ends thereof are fixed to both side walls 1a and 1a of the separation tank 1 via fixing tools 28. The support shaft 26 made of this hollow pipe is
One side surface is opened in the cylindrical filters 21 and 22, and this opening portion forms a conduction port 29. Then, the oil feed pipe 40 is connected to one end of the support shaft 26,
The oil supply pipe 40 extends to the outside of the separation tank 1 and is connected to the supply pump 41. The supply pump 41 is supported by the separation tank 1 via a pump support base 42, and the discharge pipe 43 of the supply pump 41 is connected to the cutting machine 6 although not shown.

Therefore, the pores 2 of the cylindrical filters 21 and 22 are
The clean liquid guided to the support shaft 26 through 3 ... Flows into the oil feed pipe 40 through one end opening of the support shaft 26, and the clean liquid of the oil feed pipe 40 is supplied to the supply pump 41.
And is sent directly to the cutting machine 6.

Scrapers 31 and 32 are in contact with the inner and outer surfaces of the cylindrical filters 21 and 22, respectively. These scrapers 31 and 32 are made of oil-resistant rubber or the like, and are in sliding contact with the inner and outer surfaces of the filters 21 and 22, respectively. The scraper 31 on the inner side is arranged above the conduction port 29,
The foreign matter scraped off by the scraper 31 is designed to fall into the conduction port 29.

The operation of the thus constructed filter device will be described. In the course of the cutting oil flow described above, among the various sizes of chips included in the dirty cutting oil, relatively large chips and heavy chips are deposited on the bottom of the separation tank 1 and the bottom surface 2 accumulate. The accumulated foreign matter is removed by the scraper conveyor 10. That is, when the pair of scraper chains 12 travels through the drive chain 16 by the operation of the drive motor 15, the scrapers 11 run while sliding on the bottom surface 2 of the separation tank 1, and the scrapers 11 ... The foreign matter such as the chips accumulated on the surface is scraped off and carried to the discharge port 3. The foreign matter scraped to the discharge port 3 falls from the discharge port 3 into the chip storage box 4. Therefore, the foreign matter settled on the bottom surface 2 in the separation tank 1 is removed by the scraper conveyor 10.

Further, foreign matters such as chips that do not precipitate contained in the dirty liquid are filtered by the filter device 20. That is, when the dirty liquid in the separation tank 1 flows into the two cylindrical filters 21, 22 of the filter device 20, the pores 23 formed in these filters 21, 22 ...
Captured in.

Therefore, the liquid from which the foreign matter has been removed, that is, the filtered liquid flows into the filters 21 and 22. The filtered liquid, that is, the clean liquid, flows into the support shaft 26 through the communication port 29 of the support shaft 26 and is sent to the supply pump 41 through the oil feed pipe 40. The supply pump 41 sucks the clean liquid and directly supplies it to the cutting machine 6.

Further, the foreign substances captured by the cylindrical filters 21 and 22 of the filter device 20 are scraped off by the scrapers 31 and 32 which are in sliding contact with the cylindrical filters 21 and 22, and the fine particles of the filters 21 and 22 are removed. The holes 23 are removed. Therefore, clogging of the filters 21 and 22 is prevented.

According to the filtration device having such a configuration, since the filtrate passed through the filter device 20 is directly supplied to the cutting machine by the supply pump 41, the large-sized sedimentation tank 100 as in the prior art is unnecessary. . Therefore, there is no need to install a large-sized precipitation tank 100 that requires a large space, the installation space is small, the area occupied in the factory is small, and there is no obstruction. Further, it is not necessary to periodically remove the foreign matter settled and deposited in the settling tank 100, and such a troublesome operation can be omitted.

It should be noted that fine and minute foreign matter may remain in the filtrate passing through the filter device 20,
Such a minute and minute amount of residual foreign matter is generated by the supply pump 41.
Is sent to the machine tool, and the clogging of the pump 41 is prevented.

Even if a minute and trace amount of residual foreign matter remains in the filtrate sent out from the supply pump 41,
In some cases, this filtered liquid can be reused, and when it is desired to avoid residual fine and minute foreign matter, the filtered liquid sent from the supply pump 41 is returned to the machine tool with a high precision filter device (not shown). ) To remove fine and minute foreign matter.

Further, in the above embodiment, the clean liquid flowing into the support shaft 26 is sent to the supply pump 41 through the oil supply pipe 40, but from the oil supply pipe 40, a small capacity tank chamber (not shown) is provided. ), And the liquid in the tank chamber may be supplied to the cutting machine 6 by the supply pump 41.

In the above embodiment, the cylindrical mesh filters 21 and 22 made of punching metal are used as the filter device 20, but the present invention is not limited to this, and a wedge wire or a polyamide (nylon) mesh is used. A cylindrical filter may be used.

FIG. 7 shows the case of the second embodiment, which is a cylindrical filter 12 using a polyamide (nylon) mesh.
1 is shown. The tubular filter 121 made of this nylon mesh introduces the liquid through the pores 123 between the meshes, and at this time, filters the foreign matter. The filtered liquid, that is, the clean liquid, that has flowed into the filter 121 is supported by the support shaft 126.
It flows into the support shaft 26 through the communication port 129 of the above and is sent to the supply pump. In this case, since the cylindrical filter 121 made of nylon mesh cannot scrape the captured foreign matter with the scraper, the backwashing device is used to remove the captured foreign matter. That is, in FIG. 7, reference numeral 130 is a backwashing pipe for supplying the backwashing liquid, which is guided into the support shaft 126. The backwash pipe 130 is connected to a backwash pump (not shown). A plurality of backwash nozzles 131 (only one is shown in the drawing) are connected to the backwash pipe 130,
These backwashing nozzles 131 are inserted through the conducting ports 129 and face the inner surface of the filter 121 made of a tubular nylon mesh. Therefore, when the backwashing liquid is supplied from the backwashing pump to the backwashing pipe 130, the backwashing nozzle 131
The backwash liquid is sprayed onto the inner surface of the filter 121 through. The foreign matter adhering to the surface of the filter 121 can be removed by this injection pressure. Therefore, clogging can be prevented and durability can be maintained. In addition, it is desirable that the above-mentioned backwash is performed at a position above the liquid surface W.

When a tubular filter is used, the filter area can be increased and the filtering performance can be improved, although the filter can be made small. In this case, the cylindrical filter is preferably cylindrical, but may have a shape such as a polygonal cylinder or an elliptic cylinder.

The present invention is not limited to being applied to a chip settling filtration device for a cutting machine, but a filtration device for removing mixed foreign matters such as abrasive grains from the grinding oil used in a grinding machine, and the like. It can be applied to a machine oil filtering device for various machine tools.

[0033]

As described above, according to the first aspect of the present invention, the filtrate passed through the cylindrical filter is directly supplied to the machine tool by the supply pump without passing through the precipitation tank. No need for a separate precipitation tank,
The entire filtration device is compact and requires a small installation space. For this reason, the area occupied in the factory becomes small and does not get in the way. Further, it is not necessary to regularly remove the foreign matter settled and deposited in the settling tank, and such troublesome work can be omitted, so that the maintenance becomes easy.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention and showing an entire filtering device.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a cross-sectional view of a cylindrical filter made of punching metal according to the same embodiment.

FIG. 5 is a perspective view of the tubular filter of the embodiment.

FIG. 6 is a vertical cross-sectional view of the tubular filter according to the embodiment.

FIG. 7 is a vertical cross-sectional view showing a second embodiment of the present invention and showing a cylindrical filter made of nylon mesh and its backwashing structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Separation tank 2 ... Bottom surface 3 ... Discharge port 4 ... Chip storage box 5 ... Input port 7 ... Oil discharge duct 10 ... Scraper conveyor 11 ... Scraper 12 ... Scraper chain 20 ... Filter device 21,22, 121 ... Cylindrical filter 23 ... Pore 26 ... Support shaft 27 ... Sprocket 29 ... Conduction port 30 ... Discharge port 31, 32 ... Scraper 41 ... Supply pump

Claims (1)

[Claims] 1. Introducing a contaminated liquid used in a machine tool,
A separation tank that is inclined so that one end of the bottom surface is above the liquid surface and a discharge port is formed at this inclined end; and slides along the bottom wall of the separation tank to scrape off the foreign matter. A scraper conveyor that removes from the discharge port; a cylindrical filter provided in the liquid in the separation tank; a supply pump that sucks the filtered liquid that has passed through the cylindrical filter and supplies it to the machine tool. A filtering device characterized by the above.