filtration device

Abstract

This invention provides a compact filtration system that eliminates the need for a secondary filter, thereby reducing both initial and maintenance costs. [Solution] The tank body 3 of the filtration device houses a filtration drum 10 for filtering the liquid to be filtered. A first filter 20a is provided on one side of the filtration drum 10, and a second filter 20b with a higher filter density than the first filter 20a is provided on the other side. A partition plate 24 is provided between the part where the first filter 20a is provided and the part where the second filter 20b is provided. A rotating shaft 25 is provided running through the width direction of the filtration drum 10 and the partition plate 24.

Description

Technical Field

[0001] The present invention relates to a filtering device for filtering a filtrate inside a tank body.

Background Art

[0002] A filtering device for filtering used machining oil containing chips discharged from a machine tool, such as used cutting oil discharged from a cutting machine, usually includes a tank body into which the filtrate flows, and a filtering drum installed in the tank body (see, for example, Patent Documents 1 to 3).

[0003] The filtrate flows from the outside to the inside of the filtering drum and is filtered by a filtering filter provided on the outer peripheral surface of the filtering drum to be separated into oil (liquid) and chips (solid).

[0004] At that time, the finer the mesh of the filter, the relatively smaller chips can be separated, so that the filtering accuracy can be increased.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Disclosure of the Invention

Problems to be Solved by the Invention

[0006] However, when the mesh is fine, not only solid chips but also liquid oil becomes difficult to pass through the filter, and there is a limit to making the mesh finer.

[0007] In other words, relatively large metal shavings that need to be separated also get mixed into the filtration drum, and these flow out of the main tank through the filtration drum, so a filter is needed as a secondary filtration means to remove them.

[0008] Therefore, in order to send the liquid to be filtered to the secondary filter, it was necessary to increase the pump capacity to apply a large pressure, which was a factor in increasing the initial cost.

[0009] Furthermore, increasing the pump capacity necessitates a larger motor capacity to drive it, which contributes to higher maintenance costs.

[0010] Furthermore, the addition of a secondary filter made the device itself more complex.

[0011] The present invention aims to provide a compact filtration device that eliminates the need for a secondary filter, thereby reducing both initial and maintenance costs. [Means for solving the problem]

[0012] Based on the inventor's findings, the present invention provides the following means for solving the above-mentioned problems.

[0013] <1> A filtration device for filtering a liquid to be filtered inside a main body, comprising: a filtration drum for filtering the liquid to be filtered, housed inside the main body of the tank; a first filter provided on one side in the width direction of the filtration drum; a second filter having a higher density than the first filter provided on the other side in the width direction of the filtration drum; a partition plate separating the portion of the filtration drum where the first filter is provided from the portion where the second filter is provided; and a rotating shaft passing through the filtration drum and the partition plate.

[0014] <2> The aforementioned rotating shaft also serves as piping for passing cleaning fluid for cleaning the filtration drum. <1> This is the filtration device described in [reference].

[0015] <3> The filtering device according to <2>, comprising a pump for supplying cleaning liquid to the rotating shaft toward the side where the second filter is installed.

[0016] <4> The filtering device according to <2>, comprising a pump for supplying cleaning liquid to the rotating shaft toward both the side where the first filter is installed and the side where the second filter is installed.

[0017] <5> The filtering device according to <1>, wherein the first filter is made of nylon.

[0018] <6> The filtering device according to <1>, wherein the second filter is made of stainless steel.

Advantages of the Invention

[0019] The filtering device of the present invention partitions a filtering drum housed in a tank body into a portion provided with a first filter and a portion provided with a second filter having a high density, and includes a filtering drum for filtering a liquid to be filtered in each of these two chambers. Therefore, a secondary filter is not required, both the initial cost and the maintenance cost can be reduced, and a compact filtering device can be obtained.

[0020] That is, if relatively large chips are separated by the first filter and relatively small chips are separated by the second filter having a high density, there is no need to provide a secondary filter. As a result, the pump for sending the liquid to be filtered can be made smaller, and its driving power can also be made smaller. Further, since the device can be made smaller, the entire device can be made compact and space-saving.

Brief Description of the Drawings

[0021] [Figure 1] FIG. 1 is a schematic cross-sectional view showing an example of the filtering device of the present invention. [Figure 2] FIG. 2 is a longitudinal sectional view of the tank body. [Figure 3] FIG. 3 is a side view of the filtering drum. [Figure 4] Figure 4 is a longitudinal sectional view of a tank body in another form.

Embodiments for Carrying Out the Invention

[0022] Embodiments of the present invention will be described in detail while referring to the drawings. In all the drawings, components having the same function are generally given the same reference numerals, and repeated descriptions are omitted as much as possible.

[0023] FIG. 1 is a schematic cross-sectional view showing an example of a filtration device of the present invention. As a basic configuration of the filtration device, in a configuration where the filtrate introduced into the device is filtered and separated through a filtration drum, and the precipitated chips are discharged outside the device by the rotation of the filtration drum or the like, there is no particular limitation as long as it is a generally used filtration device.

[0024] In the filtration device 1 shown in FIG. 1 as an example, in order from the left side in the figure, a filtrate supply pump 2, a tank body 3, and a precipitation tank 4 are provided.

[0025] The tank body 3 includes a bottom plate 5, an inclined plate 6, sprockets 7 and 8, an endless belt 9, and a filtration drum 10.

[0026] On the side of the filtrate supply pump 2 in the tank body 3, an inlet 11 for introducing a filtrate such as used cutting oil into the tank body is formed, while on the side of the discharge tank 4, a discharge portion 12 for discharging chips is formed.

[0027] The inclined plate 6 is integrally formed with the bottom plate 5 by extending such that the precipitation tank 4 side of the bottom plate 5 has an inclined surface upward. And the above-mentioned discharge portion 12 is formed downward at the tip of the inclined plate 6 facing the discharge tank 4.

[0028] The sprockets 7 and 8 are arranged as follows: a pair of sprockets 7, 7 are provided near the inlet 11, and a sprocket 8 is provided near the discharge section 12. An endless belt 9 is rotatably stretched between them, with a filtration drum 10 interposed between them. Scrapers 9a are provided on the endless belt 9 at regular intervals.

[0029] With this configuration, when the filtration device 1 is activated, the liquid to be filtered is introduced into the tank body 3 from the inlet 11 by a power transmission means such as a motor (not shown), filtered by the filtration drum 10, and settles on the bottom plate 5 due to the weight of the chips contained therein. This chip sediment is collected by the scraper 9a of the endless belt 9 and transported to the discharge section 12, from where it is discharged into the sedimentation tank 4. Meanwhile, the filtered liquid supply pump 2 is configured to send the filtered liquid discharged from the filtration drum 10 for cooling a processing machine (not shown).

[0030] <Composition of the tank body> Next, the configuration of the tank body will be explained. Figure 2 is a vertical cross-sectional view of the tank body, and Figure 3 is a side view of the filtration drum.

[0031] As shown in Figure 2, the tank body 3 is roughly rectangular in shape when viewed from the front, and the filtration drum 10 is housed inside it so that its sides are aligned with the width direction of the tank body 3.

[0032] On the left side (one side) of the filtration drum 10 in the diagram, a first filter 20a made of a relatively coarse filtration mesh is installed, fixed within the frame 21 by bolts 23 via a belt member 22.

[0033] On the right side (the other side) of the filtration drum 10 in the diagram, a second filter 20b is provided, which has a finer and denser filtration mesh than the first filter 20a. Similar to the first filter 20a, it is fixed within the frame 21 via a belt member 22 and bolts 23.

[0034] A partition plate 24 is provided along the height direction between the section where the first filter 20a is installed and the section where the second filter 20b is installed, thereby separating the two filters 20a and 20b so that the liquids to be filtered do not mix.

[0035] Furthermore, in the illustrated example, the area where the first filter 20a is installed on the left side of the diagram is wider than the area where the second filter 20b is installed on the right side of the diagram. However, the width of the areas where each filter 20a and 20b is installed can be appropriately changed according to the flow rate of the liquid to be filtered into the tank body 3.

[0036] A rotating shaft 25 is provided in the center of the filtration drum 10 and the partition plate 24, located in the height direction, and extending through it in the width direction. This rotating shaft 25 allows the filtration drum 10 and the partition plate 24 to be rotatably housed in the tank body 3.

[0037] In the tank body 3, this configuration allows the high-density second filter 20b to separate finer debris that cannot be separated by the first filter 20a, enabling simultaneous filtration within the tank body 3, which is normally a two-stage process. Therefore, a secondary filter does not need to be installed outside the tank body 3, making the device more compact.

[0038] For the filter media (filter mesh), any material commonly used as a filter media can be appropriately selected. For example, it is preferable that the first filter 20a be made of nylon and the second filter 20b be made of stainless steel. In other words, by using different filter media in this way, the first filter 20a, which only needs to filter relatively large chips, can use nylon, a resin that is not metal but has high strength, to reduce costs, and the filtration accuracy of the drum can be easily changed by changing the mesh size of the nylon. On the other hand, the second filter 20b, which filters even finer chips, can use stainless steel to ensure both high durability and fine processing.

[0039] Furthermore, two thin tubes 26 are provided from the rotating shaft 25 in the radial direction of the filtration drum 10, at approximately equal intervals in each section where the filters 20a and 20b are installed, as shown in the illustrated example. The number of these thin tubes 26 may be increased or decreased as appropriate depending on the width of the filtration drum 10.

[0040] As shown in Figure 3, the rotating shaft 25 has a hollow space in its center, which functions as a pipe 25a through which liquid passes. The thin tube 26 is connected to this pipe 25a, and a nozzle 29 is provided at its tip via an elbow pipe 27, facing forward of the filter (filtration mesh).

[0041] Furthermore, a rotating shaft pump (pump) 29 is provided on the side of the tank body 3 where the second filter 20b, which has high filtration accuracy, is installed, and which can supply liquid into the rotating shaft 25.

[0042] Therefore, by passing the cleaning solution through the rotating shaft 24 from the rotating shaft pump 29, the cleaning solution W can be evenly sprayed from the nozzle 28 toward the filters 20a and 20b by the rotation of the filtration drum 10.

[0043] In this process, since the rotating shaft pump 29 is located on the side of the second filter 20b, which has high filtration accuracy, it can wash away fine chips that are difficult to wash away with a stronger pressure than the relatively larger chips filtered by the first filter 20a, thereby making the second filter 20b even cleaner.

[0044] This ensures that any remaining metal shavings in the filter are thoroughly washed away, preventing clogging.

[0045] The rotating drum 10 has an opening 10a on its side, through which the filtered liquid is discharged to the bottom sections 30a and 30b at both ends of the tank body 3. This allows the discharged filtered liquid to be supplied to the processing machine by the filtered liquid supply pump 2. The bottom sections 30a and 30b are not connected and are transported by separate filtered liquid supply pumps 2.

[0046] <Other forms> The filtration apparatus of the present invention is not limited to the above-described form, but may include any technical ideas conceivable within that scope.

[0047] For example, in the tank body 3 shown in Figure 2, the rotating shaft pump 29 that supplies liquid into the rotating shaft 25 is provided only on the side where the second filter 20b is installed. However, as shown in the vertical cross-sectional view of another form of tank body shown in Figure 4, the rotating shaft pump 29 may also be provided on the side where the first filter 20a is installed. This reduces the pump capacity and also reduces the motor capacity required to drive it. In this case, it is preferable to insert a partition member 31 into the rotating shaft 25 to prevent the cleaning liquid from mixing from the rotating shaft pumps 29 on both sides.

[0048] Furthermore, the filtration drum 10 may be configured such that a magnetic plate is attached to the bottom plate 5 as a means for attracting magnetic shavings in the liquid to be filtered. [Explanation of symbols]

[0049] 1 Filtration device 2. Filtrate supply pump 3 Tank body 4. Sedimentation tank 5 Bottom plate 6 Inclined plate 7.8 sprocket 9 Endless belt 9a Scraper 10 Filtration Drums 10a opening 11 Inlet 12 Discharge section 20a First filter 20b Second filter 21 frames 22 Belt component 23 volts 24 partition plates 25 Rotation axis 25a Piping 26 Capillary 27 Elbow piping 28 nozzles 29. Pumps for rotating shafts (pumps) 30a,30b Tank bottom 31 Partition Member W Cleaning Solution

Claims

1. In a filtration device that filters the liquid to be filtered inside the tank body, A filter drum for filtering the liquid to be filtered, which is housed inside the tank body, A first filter provided on one side in the width direction of the filtration drum, A second filter having a higher density than the first filter is provided on the other side in the width direction of the filtration drum, A partition plate separates the portion of the filtration drum where the first filter is provided from the portion where the second filter is provided. A filtration device characterized by comprising a rotating shaft that penetrates the filtration drum and the partition plate.

2. The filtration apparatus according to claim 1, wherein the rotating shaft also serves as piping for passing cleaning fluid for cleaning the filtration drum.

3. The filtration apparatus according to claim 2, further comprising a pump that supplies cleaning fluid to the rotating shaft toward the side on which the second filter is installed.

4. The filtration apparatus according to claim 2, further comprising a pump that supplies cleaning fluid to the rotating shaft toward both the side where the first filter is installed and the side where the second filter is installed.

5. The filtration apparatus according to claim 1, wherein the first filter is made of nylon.

6. The filtration apparatus according to claim 1, wherein the second filter is made of stainless steel.

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