JP2795581B2 - Coolant filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coolant filtering device for filtering coolant used for machining.

[0002]

2. Description of the Related Art A liquid tank having an inlet through which a coolant such as water or oil used for machining such as cutting or grinding is introduced, and one end of the liquid tank is provided in an inclined state. A scraping device for scraping out the swarf that has settled into the liquid tank from the discharge slope, and a filter material on the outer peripheral wall, the central axis being substantially horizontal between the inlet of the liquid tank and the discharge slope. Provided with a bottomed cylindrical drum filter, the coolant in the liquid tank is purified by passing from the outer peripheral side to the inner peripheral side of the drum filter, and the inflow port and the discharge slope of the liquid tank are cleaned. There is known a coolant filtering device of a type which is discharged through one side wall of a pair of side walls opposed to each other. For example, it is a filtration device described in Japanese Patent Publication No. 2-44564. Such a coolant filtering device is configured to filter the used coolant from the outside to the inside of the drum filter, so that the coolant is supplied from the inside to the outside of the drum filter by supplying the coolant to the inside of the drum filter. Compared with the filtering device, the means for collecting and discharging chips can be configured relatively simply, and when a work material or a cutting tool, etc. is accidentally dropped together with the coolant from the inflow port into the filtering device, the filtering material is removed. There is an advantage that damage to the is prevented.

[0003]

However, in the above-mentioned conventional coolant filtering apparatus, since the bottom wall of the drum filter is rotatably connected to the side wall of the liquid tank via the rod-shaped rotary shaft, the filtering area of the drum filter is reduced. If the liquid surface in the liquid tank is filtered at a height near the rotation axis of the drum filter, the chips floating on the liquid surface on the inlet side in the liquid tank are discharged. An attempt to move to the slope side is hindered by the rod-shaped rotating shaft of the drum filter. For this reason, the chips floating on the liquid surface are concentrated near the liquid surface at the inflow port, and there is a disadvantage that the chips are not discharged by the scraping of the chips by the discharge slope. Especially, when the machined product is a light metal product such as an aluminum alloy, a large amount of pill-shaped lumps in which individual chips in a relatively long curled shape are entangled easily float around the liquid surface of the liquid tank. The inconvenience was remarkable. Further, in the conventional coolant filtering device, since the bottom wall of the drum filter has a rod-shaped rotating shaft attached thereto, the drum filter cannot be formed of a filtering material, and the drum filter must be large in order to obtain a filtering area. Was.

The present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently scrape off chips and the like near the liquid surface in a liquid tank, and have a small size and high filtration capacity. It is to provide a filtration device having the following.

The gist of the present invention for achieving the above object is to provide a liquid tank having an inflow port through which a coolant used for machining flows, and an inclined state at one end of the liquid tank. A scraping device that scrapes out the chips that have settled in the liquid tank from the provided discharge slope, and a filter material on the outer peripheral wall, and the central axis is substantially horizontal between the inlet of the liquid tank and the discharge slope. And a bottomed cylindrical drum filter disposed so that the coolant in the liquid tank is purified by being passed from the outer peripheral side to the inner peripheral side of the drum filter, and the inflow port of the liquid tank is purified. a pair of coolant filtration apparatus odor of the type which is allowed to flow through one side wall of the side walls facing each other between the discharge slope and
Te, and the drum filter bottom wall of the drum filter across the other side wall a predetermined distance of the pair of side walls
The outer peripheral part of the wall is provided with a cantilevered rotary support device for rotatably supporting the drum filter in cantilever shape in said one side wall while being immersed in the liquid level of the liquid tank, further, the de of
Filter material for filtering the coolant on the bottom wall of the ram filter
Has been attached .

[0006]

If [Function and Effect of the Invention] Thus, the cantilever rotational support device, and the drum across the other side wall a predetermined distance of the bottom wall of the pair of side walls of the drum filter
Some of the outer peripheral wall of the filter is rotatably supported in the cantilever shape in the drum filter the one side wall while being immersed in the liquid surface of the liquid tank, further, the bottom wall of the drum filter
Ru filtering material for filtering coolant is attached to. As a result, even when the liquid level in the liquid tank is filtered at a height near the rotation axis of the drum filter, the chips floating near the liquid level on the inlet side are still in contact with the bottom wall of the drum filter. Since it is moved to the discharge slope side by passing between the other side wall of the tank, chips floating on the liquid surface by the scraping operation of the scraping device near the discharge slope are also efficiently discharged. Such an effect is particularly remarkable when the machined product is a light metal product such as an aluminum alloy.

[0007] Further, since the rotary shaft is not provided on the bottom wall of the drum filter, and a filter material for filtering the coolant is attached to the bottom wall, the filtration area is smaller than that of the conventional one. Can be increased, and the size of the drum filter can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing the configuration of a coolant filtering apparatus according to one embodiment of the present invention. The coolant filtering device includes a main body device 10 that purifies used coolant used for cutting processing and a main body device 1 that accommodates the main body device 10.
It consists of a storage tank 12 for receiving the purified coolant that flows out of the tank.

The main unit 10 includes a processing tank 18 having at one end an inlet 17 through which the used coolant received in the receiving tank 16 flows when the work material 14 is cut by a cutting apparatus (not shown). Inlet 17 of processing tank 18
A plate-shaped member provided at the other end opposite to the above, and inclined to scrape out the chips 19 settled in the treatment tank 18 or floating on the liquid surface at the other end. The discharged slope 20 and the discharged slope 2 for returning the coolant contained in the scraped-up swarf 19 into the processing tank 18.
A dewatering table 21 provided at the tip portion at an inclination angle smaller than 0, a cylindrical drum filter 22 with a bottom for filtering coolant, and a scraper for rotating the drum filter 22 and scraping out the chips 19. And the delivery device 24.

[0011] Drum filter 22, an inlet 17 in the treatment tank 18 the central axis is disposed so as to be substantially horizontal between the discharge slope 2 0, as shown in detail in Figure 2, coarse A filter cloth 34 made of a polyester material is attached to the entire outer surfaces of the mesh-shaped outer peripheral wall 30 and the bottom wall 32. The size (mesh) of the mesh of the filter cloth 34 is
For example, it is set to about 250 μm depending on the type of the device. A pair of first and second side walls 42 and 44 are located between the inflow port 17 and the discharge slope 20 of the processing tank 18 so as to face each other. A predetermined distance D from one side wall 42 and a drum
Part of the outer peripheral wall 30 of the filter 22 is
In a state of being immersed , the second side wall 44 is rotatably supported in a cantilever manner via bearings 54 and 56 corresponding to the cantilever rotation support device of the present invention.

That is, in FIG. 2, the flange 48 of the outer cylindrical member 53 and the annular member 50 are fixed to the circular opening 46 of the second side wall 44 with the bolt 52 with the second side wall 44 interposed therebetween. The outer peripheral cylindrical member 53 is fitted so as to protrude outward from the circular opening 46. Inside the outer peripheral cylindrical member 53, a bearing 54,
The inner peripheral cylindrical member 40 is rotatably supported via 56. An annular cover 58 is provided at one end of the inner peripheral cylindrical member 40 protruding outside the second side wall 44 with a plurality of bolts 6.
0, the outer peripheral flange 62 is integrally provided at the other end protruding inside the second side wall 44. The drum filter 22 is integrally formed with the annular sprocket 38, the inner cylindrical member 40, the cover 58, and the like by fixing the annular connecting portion 63 to the annular sprocket 38 and the outer peripheral flange portion 62 with a plurality of bolts 64. And is rotatably supported on the second side wall 44 in a cantilever manner. The purified coolant that is passed through the filter cloth 34 from the outer peripheral side to the inner peripheral side of the drum filter 22 is supplied to the outlet 6 inside the inner cylindrical member 40.
6 to the storage tank 12.
67 and 68 are stop rings for preventing the movement of the bearings 54 and 56, and 69 is a bearing 54, 5
6 is an oil seal for preventing oil leakage from 6. Further, inside the drum filter 22, a washing nozzle 70 having a plurality of holes 70a in an upper portion where the purified coolant is injected in a gas mixed state is inserted at a position slightly higher than the center axis thereof, The filter cloth 34 is washed from the inside of the drum filter 22 in a direction opposite to the filtration direction by the purified coolant purified by the cloth 34.

As shown in FIGS. 1 and 3, the scraping device 24 includes a drive shaft 7 near the dehydrating table 21 of the processing tank 18.
2, a driving device 76 for rotating and driving the driving shaft 72, a pair of second sprockets 80 provided on the rotating shaft 78 near the inlet 17 of the processing tank 18, A tension roller 83 provided on the plate 81 and the first side wall 42 so as to be rotatable concentrically with the annular sprocket 38 by a rotation shaft 82 and a first sprocket 74 and a second sprocket 80 on the first side wall 42 side.
A first chain 84 wound around the tension roller 83 and a first sprocket 74 on the second side wall 44 side;
A second chain 86 wound around the second sprocket 80 and the annular sprocket 38; a plurality of plate-shaped scrapers 88 provided at substantially equal intervals on the first chain 84 and the second chain 86; Slip sensor 8 for detecting a slip state of second chain 86
9.

In FIG. 1, FIG. 3 and FIG.
2, a liquid level meter 92 and a water supply pump 9
4, and an accumulator 96 is attached.
The liquid level meter 92 includes a lower limit water level sensor (not shown).
Thereby, it is notified that the water level of the purified coolant in the storage tank 12 has dropped to a predetermined position. The water supply pump 94 has a valve 100 and a pressure gauge 102.
The coolant supply pipe 104 provided with the coolant is connected, and a part of the purified coolant in the storage tank 12 is supplied to the workpiece 14 again through the coolant supply pipe 104. The accumulator 96 includes a gas supply source 105 such as a compressor.
Is the check valve 108 of the gas supply pipe 106, the electromagnetic on-off valve 11
0, a regulator 111 for adjusting the pressure in the gas supply pipe 106 to a constant level, and a check valve 107, which are sequentially connected through a coolant supply pipe 104, a branch pipe 116 having a valve 114, and a check valve 107. The water supply pump 94 is connected to the washing nozzle 70 via a gas-liquid supply pipe 118. For this reason, when gas flows into the accumulator 96 in response to the operation of the solenoid on-off valve 110, the purified coolant containing air bubbles flows from the hole 70 a of the cleaning nozzle 70 into the outer peripheral wall 30 and the bottom wall 32.
The filter cloth 34 is sprayed.

Next, the operation of the above-described coolant purifying apparatus will be described. The coolant in the processing tank 18 is passed from the outer peripheral side to the inner peripheral side of the drum filter 22 to be purified, and the purified coolant is discharged into the storage tank 12 through the outlet 66, and is supplied to the water supply pump 9.
4 again supplies the work material 14. When the driving device 74 is operated to rotate the drive shaft 74 continuously or intermittently, the second chain 86
As a result, the drum filter 22 is rotated in the direction of the arrow in FIG. 1, and the scraper 88 is separated from the bottom surface of the processing tank 18 and the surface of the discharge slope 20 by the first chain 84 and the second chain 86. Moved in state. As a result, of the chips 19 settled in the processing tank 18 and the chips 19 floating near the liquid surface, the bottom wall 32 of the drum filter 22 and the first side wall 42 of the processing tank 18 from the vicinity of the inlet 17. Discharge slope 2 passing between
The chip 19 moved to the 0 side is scraped up along the discharge slope 20 by the scraper 88 and pushed out onto the dewatering table 21, and is further pushed out by the scraped-up chip 19. It is dropped into 120 and collected. On the other hand, in the drum filter 22, the electromagnetic on-off valve 1
10 is opened in a predetermined cycle, so that a mixture of purified coolant and gas is intermittently injected from the hole 70 a of the cleaning nozzle 70 toward the outer peripheral wall 30 and the bottom wall 32 of the rotating drum filter 22. Then, the filter cloth 34 is washed in the direction opposite to the filtration direction.

As described above, according to this embodiment, the bottom wall 32 of the drum filter 22 is
Is separated from the first side wall 42 by a predetermined distance, and
22 is partially immersed in the liquid surface of the processing tank 18.
In was state, the drum filter 22 is rotatably supported in cantilever form in the second side wall 44, further, the drum fill
A filter cloth 34 for filtering the coolant is attached to the bottom wall 32 of the filter 22.
Ri Ru attached. Thus, even when the liquid level in the processing tank 18 is filtered at a height near the rotation axis of the drum filter 22 in order to increase the filtration area of the drum filter 22 as much as possible, the inlet 17 side The chips 19 floating near the liquid surface are deposited on the bottom wall 32 of the drum filter 22 and the processing tank 18.
The chips 19 floating on the liquid surface near the discharge slope 20 are also efficiently moved by the scraper 88 to lift the chips 19 because the chips 19 are sequentially moved toward the discharge slope 20 through the gap between the first side wall 42 and the first side wall 42. Is discharged. In particular, when the machined product is a light metal product such as an aluminum alloy, a relatively long curled shape individual swarf is entangled with a large amount of shaved lumps in the vicinity of the liquid surface of the processing tank 18, so that it is easy to float.
The above effect is particularly remarkably obtained.

Further, according to the present embodiment, since the rotary shaft is not provided on the bottom wall 32 of the drum filter 22, the filter cloth 34 can be attached to the bottom wall 32, and the bottom wall 3
As compared with a conventional apparatus in which a plate member or the like for attaching a rod-shaped rotary shaft is provided in 2, the filtration area is increased and the drum filter 22 is reduced in size.

In the coolant filtering apparatus according to the present embodiment, the chips 19 scraped up to the dewatering table 21 by the scraper 88 are extruded by the next chip 19 scraped up by the scraper 88 for a predetermined period. The coolant contained in the cuttings 19 is appropriately collected in the processing tank 18 because the coolant 21 is retained on the scrap 21, and the coolant consumption is suppressed.

In this embodiment, the drum filter 22
The filter cloth 34 of the polyester material provided in the processing tank 1
The coolant is vibrated in accordance with the wave of the coolant level in 8.
For this reason, compared with the conventional filtration device in which the filtering material is a metal material, the cuttings 19 are efficiently dropped off to the filter cloth 34,
Filtration efficiency is suitably maintained.

Moreover, in this embodiment, the accumulator 9
From the hole 70 a of the cleaning nozzle 70 connected to the nozzle 6, the purified coolant containing air bubbles is sprayed from the inside of the drum filter 22 toward the attachment surface of the filter cloth 34.
For this reason, the purified coolant hits the filter cloth 34 intermittently against the swarf 19 clogged from the surface of the filter cloth 34 opposite to the surface to which the filter cloth 34 is attached from the side of the filter cloth 34 by air bubbles. As a result, the chips 19 are effectively removed, and the filter cloth 34 is suitably regenerated.

While the embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other embodiments.

For example, in the above-described embodiment, the coolant filtering apparatus for filtering the coolant used for the cutting process has been described. However, when removing the grinding powder and the like from the coolant used for other machining such as the grinding process. The present invention can also be applied to the present invention.

Further, the drum filter 22 of the above-described embodiment is used.
Provided the filter cloth 34, but other materials such as filter paper may be used, and the filter cloth 34 may not be provided if the drum filter 22 itself is formed of a fine mesh. .

The above is an embodiment of the present invention, and the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view illustrating a configuration and a piping of a coolant filtering apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part, illustrating in detail a drum filter of the coolant filtration device of FIG. 1;

FIG. 3 is a plan view of a part of the coolant filtration device in FIG.

FIG. 4 is a side view of the coolant filtering device of FIG. 1 with a part cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main body apparatus, 12 Storage tank (coolant filtration device) 17 Inflow port 18 Processing tank 19 Chip 20 Discharge slope 22 Drum filter 24 Scrape device 32 Bottom wall 34 Filter cloth (filter material) 42 1st side wall (other side wall) 44 Second side wall (one side wall) 54, 56 Bearing (cantilever rotation support device)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-153115 (JP, A) JP-A-3-294143 (JP, A) JP-A-57-152909 (JP, U) JP-A-4-152909 57207 (JP, U) JP-A 3-109618 (JP, U) JP 2-44564 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B01D 33/048 B01D 33 / 067 B23Q 11/00

Claims (1)

(57) [Claims] 1. A liquid tank having an inflow port through which a coolant used for machining is introduced, and cutting chips settled in the liquid tank from a discharge slope provided at one end of the liquid tank in an inclined state. And a bottomed cylindrical drum filter having a scraping device for scraping off the liquid, and a filter medium on the outer peripheral wall, the central axis being substantially horizontal between the inlet of the liquid tank and the discharge slope. The liquid tank is purified by passing the coolant in the liquid tank from the outer peripheral side to the inner peripheral side of the drum filter, and a pair of opposed liquid supply ports and a discharge slope of the liquid tank are opposed to each other. coolant filtering device odor of the type which is allowed to flow through one side wall of the side wall
Te, and the outer periphery of the drum filter across the other side wall a predetermined distance of the bottom wall of the pair of side walls of the drum filter
Rotatably cantilever rotational support device for supporting part in a state of being immersed in the liquid level of the liquid bath the drum filter in cantilever shape in said one side wall of the wall is provided, further, the drum
Filter material for filtering the coolant is placed on the bottom wall of the filter.
A coolant filtration device characterized by being attached .