JPH0286900A - Method and device for filtering waste cutting fluid - Google Patents

Abstract

PURPOSE:To efficiently execute the filtration of a waste cutting fluid and the dehydration of sludge by filtering the waste cutting fluid with main filter machines, mixing the separated sludge with part of the waste fluid by back washing to form a thick sludge liquid, filtering this liquid with a dehydration filter machine and dehydrating and discharging the separated sludge. CONSTITUTION:The waste cutting fluid contg. the sludge is subjected to removal of coarse dust with a strainer 6 and is then sent to the respective main filter machines 2a to 2d by which the fluid is filtered. Pressure air is delivered backward and the sludge removal by back washing is executed when the amt. of the sludge sticking to the outside wall of the filter attains a prescribed value in the filtration process. This stripped sludge is discharged together with the remaining fluid into a back washing junction tank 17 and is made into the thick sludge liquid. The thick liquid is force-fed to the dehydration filter machine 3 and is filtered. The high-pressure air is blown to dehydrate the sludge when the amt. of the sludge sticking to the inside wall of the filter attains the prescribed value. The dehydrated sludge is stripped by rotation of a blade, etc., and is discharged. The filtration of the waste fluid and the dehydration of the sludge are thus efficiently executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for filtering a grinding (including cutting) waste liquid (hereinafter simply referred to as waste liquid).

[Conventional technology]

Various types of filtration devices are used for the above-mentioned waste liquid. In this case, the filtration device must be periodically stopped in order to remove the captured sludge and update the filtration efficiency. Therefore, it is common to use multiple units in parallel, and the separated sludge is discharged as sludge liquid together with a portion of the waste liquid.

[Invention tries to solve it! ! Title]

The above-mentioned sludge liquid requires trouble to handle and transport, and there are problems such as polluting the environment. For this reason, it is preferable to dewater the sludge, but dewatering using a general waste liquid filter is possible depending on the structure, but dewatering takes a considerable amount of time and is inefficient, and requires an increase in the number of machines installed. It is actually difficult.

In view of this, an object of the present invention is to efficiently perform the filtration of waste liquid and the dehydration of separated sludge using a filter that is a combination of the two.

[Means to solve the problem]

The method of the present invention to achieve the above object is to filter the grinding waste liquid using a main filter, and the separated sludge is mixed with a part of the waste liquid by backwashing to form a thick sludge liquid, which is then supplied to a dewatering filter. In addition to filtering, the separated sludge is dehydrated and discharged.

In this case, it is preferable that the filtrate filtered by the main filter is sent to a cooling device and cooled when the temperature is higher than a predetermined temperature.

The apparatus of the present invention for carrying out the above method includes a sewage tank that receives grinding waste liquid, a main filtration machine that pumps the waste liquid in this tank and filters the sent waste liquid, and is connected to the main filtration machine. 1.
The main filter backwashes the separated sludge and supplies the sludge concentrate from the backwash to the dewatering filter, which filters this and dehydrates and discharges the separated sludge. .

In this case, the main filter may be mainly composed of a tubular filter in which a wedge wire having a wedge-shaped cross section is wound at minute intervals to form a cylindrical shape.

Further, the dewatering filter may be mainly composed of a tubular filter in which a wedge wire having a wedge-shaped cross section is wound at minute intervals to form a cylindrical shape.

Further, a cooling device may be connected to the main filter, and the filtrate may be cooled by the cooling device.

Furthermore, it is preferable that the cooling device includes an oil removal mechanism for removing floating oil.

Note that it is preferable that a water level gauge is provided in the waste water tank, and that an auto feeder for replenishing cutting fluid is activated when the water level drops below a set value.

[For production]

The waste liquid is filtered by the main filter, and the separated sludge is mixed with a portion of the waste liquid by backwashing and discharged as a thick sludge liquid, which is then supplied to the dewatering filter. A dewatering filter filters this, dehydrates the separated sludge, and discharges it.

By attaching a filtrate cooling device to the main filter, the filtrate is sent out at a temperature below a predetermined temperature.

In addition, when the main filter and/or dewatering filter uses a tubular filter made by winding wedge wire with a wedge-shaped cross section at minute intervals, it is convenient to use high-pressure air for backwashing. .

Note that water-insoluble oil may be mixed in the waste liquid, and this can be removed by providing an oil removal mechanism in the cooling device.

Furthermore, by providing an autofeeder for replenishing cutting fluid, 1. The depleted grinding fluid can be automatically replenished.・
, [Embodiment] The figure shows an embodiment of the present invention, in which the filtration device 1 includes a plurality of main filters 2a, 2b, and 2c, for example, four main filters.

2d (hereinafter simply referred to as 2), a dewatering filter 3, and a wastewater tank 4 for storing the supplied waste liquid.

Reference numeral 5 denotes a waste liquid collection gutter which opens above the tank 4, and a strainer 6 for removing bulky waste is provided at the opening.

7 indicates a filtration pump group, each of the main filters 2a, 2
b Filtration pump 7a for...

7b, 7c, 7d and a backup pump 7e, each of the pumps 7a to 7d is equipped with a self-sufficient tank 8a to 8d, and each of the self-sufficient tanks is connected with a suction vibrator 9a to 9d that opens into the wastewater tank 4. The discharge pipe group 10 is configured to send waste liquid from each pump including the backup pump 7e to an arbitrary main filter 2.

Each main filtration l! 2 filters the waste liquid sent from the pump g￥7, and the filtrate is sent out to vibrators 11a to 11d.
The water is sent to the cooling tank 16 of the cooling device 15 via the on-off valves 12a to 12d. Further, the separated sludge is discharged to the backwash relay tank 17 as a thick sludge liquid together with a portion of the waste liquid. 18a to 18d are on-off valves provided in the discharge pipe.

The cooling device 15 is provided as necessary and includes a filtrate suction pump 20, a water sprinkler pipe 21, an intake fan 22, and a filler 23. The intake fan 22 detects the temperature of the liquid in the cooling tank 16 with a temperature sensor 24. drive or stop. In addition, in the cooling tank 16, oil contained in the grinding fluid is separated and floated, and an oil removal mechanism 30 is used to remove this oil.
are installed in succession.

That is, the cooling tank 16 is provided with a delivery pipe 25 that sends out the lower liquid from which the oil has been separated into the factory, and a partition wall 26 that separates the liquid level. The oil is returned to the wastewater tank 4 via the pipe 27, and the floating oil is sent to the oil recovery pipe 3.
1 to the oil removal mechanism 30.

This oil removal mechanism 30 includes an oil storage tank 32 that stores liquid containing waste oil and an oil skimmer 33 that absorbs floating oil.
The oil content absorbed by the oil skimmer 33 is stored in a recovery tank 34. Note that 35 is an oil storage tank 32
This is a partition wall that separates the liquid level in the tank 32, and separates the water in the lower part of the tank 32 from oil and returns it to the sewage tank 4 through an overflow pipe 36.

In the figure, 28 and 37 are drain pipes provided in the cooling tank 16 and the oil storage tank 32, respectively, for draining water during cleaning inside the tank.

The dewatering filter 3 is designed to feed and filter the S-thick sludge liquid collected in the relay tank 17 using a dehydrating pump 4o, and to dehydrate and discharge the separated sludge, and there is no need for reliable filtration. The purpose is to separate and discharge the filtrate, and the filtrate containing some sludge is returned to the wastewater tank 4 or the relay tank 17 by the cut-off valve 41.

Further, 50 is a high-pressure air supply mechanism for backwashing, in which high-pressure air from a high-pressure air supply source (illustrator! 8) is supplied by a supply vibrator 51, and the pressure is reduced by a pressure-reducing valve 52 (for example, 2 k3
/arm 2) L/ is supplied to the compressed air header 53. This header 53 is connected to the filtrate sending vibe l.
It is connected to la to lid via on-off valves 54a to 54d.

Further, a part of the high-pressure air is reduced in pressure (for example, to 5 kg/cva 2 ) by a pressure-reducing valve 55 and connected to the dehydration filtration fi3 via a pressure air supply pipe 56. 57 is an on-off valve.

Reference numeral 60 denotes a sludge discharge mechanism, which includes a conveyor 61 for collecting bulky garbage accumulated on the strainer 6, a conveyor 62 for collecting and sending out the bulky garbage and sludge discharged from the dewatering filter 3, and the sludge. A hopper 63 is provided. Each of the conveyors 61 and 62 is constructed of a well-known chino-type scraping mechanism in which brushes or seeding plates are attached at intervals to the chino.

The sludge hopper 63 also has a pair of opening/closing lids 64 at the bottom.
6t5, opened and closed by opening/closing cylinders 66.67, and equipped with a receiving gutter 68 below.
5 always forms a slight gap to receive the liquid contained in the sludge in the hopper and return it to the wastewater tank 4 through the drain pipe 69.

Incidentally, reference numeral 70 denotes an auto feeder, which replenishes grinding fluid or water when the water level of the waste water tank 4 decreases, and clean water is supplied to the self-sufficiency tank 8 through a flow meter 71.
3~8d or cooling system! It is selectively supplied to the cooling tank 16 at t16. Alternatively, a water-soluble grinding fluid is stored in the oil tank 72 and sent out by the pressurizing force of the feeder pump 73, mixed with tap water and supplied to the cooling tank 16. 74 is a water level gauge that detects the water level of the wastewater tank 4.

Note that 75 and cooling tank 16 provided in the sewage tank 4
The numerals 76 provided in the pumps are respectively pressurized air jetting pipes, which are devices that intermittently blow in compressed air to agitate the waste liquid in order to prevent the waste liquid from spoiling during temporary stoppages.

Note that the main filter 2 can be of any suitable structure, but
This embodiment shows an example using a tupra filter in which a wedge wire having a wedge-shaped cross section is wound into a cylindrical shape, and the details thereof are shown in FIG. 2.

This main filter 2 has a plurality of chupra filters 80.80
is housed in a processing tower 81, and the Chupra filter 80 is formed by winding the wedge wire 82 in a cylindrical shape with the pointed end inside, leaving a V & fine gap S, and the lower part is connected to the bottom plate 84.
The upper part is attached to a partition wall 86 that divides the inside of the treatment tower 81 into a filtration chamber 84 and a purification chamber 85, and the inner hole opens into the purification chamber 85. 87 in the figure is a relay tank 17.
88 is a waste liquid supply pipe connected to the discharge pipe group 10, and 89 is a pressure air supply pipe for drain removal and backwashing.

Further, in this embodiment, the dewatering filter 3 similarly uses a chupra filter in which the wedge wire described above is wound, the details of which are shown in FIG. It is wound into a cylindrical shape with a small gap S as the outside, and the upper part is sealed.It is housed in the treatment tower 93, and the inside is connected to the filtration chamber 94 and the outside by the Tupra filter itself. The waste supply pipe 9 connected to the relay tank 17 is divided into purification chambers 95.
6 and the pressurized air supply pipe 56 into the internal filtration chamber 94, a screw or straight blade blade 97 is housed as a means for removing sludge adhering to the inner wall of the filter, and a drive motor 98 (
The on-off valve 1 is rotated and removed by Fig. 1) and installed below.
001trWI is released and released falling. 99 is a discharge pipe connected to the cutoff valve 41.

In the above configuration, bulky waste is removed from the waste liquid containing sludge by the strainer 6, and the waste liquid is accumulated in the wastewater tank 4. This waste liquid is sucked up by the filtration pump group 7,
Accumulated in the self-sufficient tanks 8a to 8d, and the discharge pipe group l
0 to each main filtration I12a-2d.

In FIG. 2, a waste liquid supply pipe 8 is connected to the discharge pipe group 10.
In the waste liquid pressurized into the filtration chamber 84 from 8, minute sludge initially passes through the minute gap S of the Tupra filter 80, but larger sludge bridges and is captured. - This forms a pre-filtration layer (pre-coat), after which even the minute sludge is captured and the filtrate is sent to the cooling device 15 via the delivery pipes lla to lld.

When the filtrate is at a high temperature higher than a predetermined temperature, it is cooled by the cooling device. Further, in this cooling device, oil droplets contained in the filtrate float to the surface in the cooling tank 16, and are removed by the oil removal mechanism 30, and the purified liquid containing no floating oil is sent into the factory again.

On the other hand, in the main filters 2a to 2d, when the sludge adhering to the outer wall of the Chupra filter 80 becomes considerably thick and the filtration resistance reaches a predetermined value, sludge is removed by backwashing.

However, at this time, instead of running each filter at the same time,
It is preferable to carry out the steps sequentially.

During backwashing, first close the on-off valves 12a-12d of the delivery vibrators lla-lid and the on-off valves from the discharge pipe group lO, and then close the on-off valves 18a-18a connected to the backwash relay tank 17.
After 18d, pressurized air is sent out from the compressed air header 53 and sent back through the pipes 11a to 12d.

As a result, the adhered sludge is peeled off and discharged into the backwash relay tank 17 together with the residual liquid in the treatment tower 81. That is, the sludge is stored in the tank as a concentrated liquid.

The liquid in this tank is pressurized into the Chupra filter 90 from the supply pipe 96 in FIG. The water is returned to the wastewater tank 4 or the backwash relay tank 17 by switching.

When the amount of sludge attached increases and the filtration resistance reaches a predetermined value, the on-off valve of the supply pipe 96 is closed, and the pressure air supply pipe 56 is closed.
High-pressure air is blown into the treatment tower 93 to drain the liquid from the discharge pipe 9.
Discharge from 9.

The sludge is dehydrated by passing the high pressure air through the adhered sludge, and after blowing for a predetermined time, the air is stopped and the blade 9
7 to peel off the sludge, and open/close valve 100 to discharge it.

The bulky waste on the strainer 6 and the discharged sludge are sent into the sludge hopper 63 by the delivery conveyor 62, and the water separated during accumulation is collected and discharged by the receiving gutter 68, and the receiving gutter 68 is moved laterally as appropriate. It rotates to open the opening/closing lids 64 and 65, and the sludge is discharged and carried out.

The water level in the sewage tank 4 is detected by a water level gauge 74, and when the water level drops below the set value,
The auto feeder 7o is operated to replenish the appropriate locations with clean water or a mixture of clean water and water-soluble grinding fluid.

Although the above embodiment shows an example in which a chupra filter in which a wedge wire is wound in a cylindrical shape is used as the main filtration device and a dewatering filtration device, the present invention is not limited to this, and for example, a filter cloth may be used as the main filtration device. It is also possible to utilize the filters used, and the design of several of them can be changed without departing from the gist of the present invention.

〔Effect of the invention〕

The present invention has the following effects.

The waste liquid is filtered by combining the main filter and the dehydration filter.The main filter mainly filters the waste liquid, and the separated sludge is discharged together with a part of the waste liquid as a thick sludge liquid. Since this is filtered to separate the sludge and dehydrate it, the main filter only needs to be stopped for backwashing time to discharge the sludge, and waste liquid filtration can be carried out efficiently. Furthermore, since the dewatering filter is supplied with a concentrated sludge liquid, the sludge layer is generated early, the time required to generate the sludge layer is shortened, and sufficient time can be spent on dewatering.

Note that by attaching a filtrate cooling device to the main filter, the filtrate can be sent out at a low temperature. At this time, when the cooling device is provided with an oil removal mechanism, water-insoluble oil mixed in the waste liquid can be removed and returned as clean switching liquid.

In addition, when the main filtration machine and dewatering filtration machine use a chupra filter in which wedge wire with a wedge-shaped cross section is wound at minute intervals into a cylindrical shape, the structure is solid and backwashing using high-pressure air is possible. At the same time, the sludge can be easily peeled off.

Furthermore, by providing an auto feeder for replenishing cutting fluid, it is possible to automatically replenish the grinding fluid when it is consumed.

[Brief explanation of drawings]

The figures relate to an embodiment of the present invention, in which Figure 1 is a piping diagram of the entire grinding waste liquid filtration device of the present invention, Figure 2 is a longitudinal sectional view of the main filter,
FIG. 3 is a longitudinal sectional view of the dewatering filter. 1 is a grinding waste liquid filtration device, 2a to 2d are main filters, 3 is a dehydration filter, 4 is a waste water tank, 15 is a cooling device, 3o is an oil removal mechanism, 5o is a high pressure air supply mechanism for backwashing, 7o is an auto It is a feeder. 82 Figures 3 Figures 1,673 Displays Japanese Patent Application No. 157567/1983 2 Name of the invention Grinding waste fluid filtration method and device 3 Relationship with the person making the amendment Patent applicant 4-2 Shioe, Amagasaki City, Hyogo Prefecture No. 30 Japan Spindle Mfg. Co., Ltd. 4, Agent No. 5 Fuji Building New Building, 1-2-8 Nishihonmachi, Nishi-ku, Osaka, Statement Box 12, Lines 16-17 "89 is for drain removal I-A The statement "89 is a pressure air supply pipe." has been corrected to "89 is an air vent pipe." 2. On page 13, line 14 of the same page, it says "It is a discharge pipe." [
The discharge pipe 101 is a drain. ” he corrected. 3. In the fourth line of page 15, the phrase "close the on-off valves" is corrected to "close the on-off valves 10a to lod". 4. Correct the figures 1 and 3 in the drawings as shown in the attached sheet.

Claims (8)

[Claims] (1) The grinding waste liquid is filtered by the main filter, and the separated sludge is backwashed and mixed with a part of the waste liquid to form a thick sludge liquid, which is then fed to the dewatering filter and filtered, and the separated sludge is A filtration method for grinding waste liquid characterized by dehydrating it and discharging it. (2) The method for filtering grinding waste fluid according to claim 1, wherein the filtrate filtered by the main filter is sent to a cooling device and is cooled when the temperature is higher than a predetermined temperature. (3) Equipped with a sewage tank that receives grinding waste liquid, a main filtration machine that pumps the waste liquid in this tank and filters the sent waste liquid, and a dewatering filtration machine that is connected to this main filtration machine. The filter backwashes the separated sludge,
A filtration device for grinding waste liquid, characterized in that a concentrated sludge liquid obtained by backwashing is supplied to a dehydration filter, and the dehydration filter filters the sludge, and also dehydrates and discharges the separated sludge. (4) The grinding waste liquid filtration device according to claim 3, wherein the main filter is mainly composed of a cylindrical Chupra filter in which wedge wires having a wedge-shaped cross section are wound at minute intervals. (5) The grinding waste liquid filtration device according to claim 3 or 4, wherein the dewatering filter is mainly composed of a cylindrical Chupra filter in which wedge wires having a wedge-shaped cross section are wound at minute intervals. . (6) The grinding waste fluid filtration device according to claim 3, 4 or 5, wherein a cooling device is connected to the main filter, and the filtrate is cooled by the cooling device. (7) The grinding waste liquid filtration device according to claim 6, wherein the cooling device is equipped with an oil removal mechanism for removing floating oil. (8) The filtration device for grinding waste fluid according to claim 3, wherein the waste water tank is provided with a water level gauge, and when the water level drops below a set value, an auto feeder for replenishing the cutting fluid is activated.