JPH0612806Y2 - Processing liquid filtration device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a working fluid filtering device for suction-filtering a used working fluid of a machine tool through a sheet filter.

[Conventional technology]

The structure of a conventional filtration device is, for example, a type in which a plurality of suction holes are provided in a sheet metal member, the surface of which is covered with a sheet-like filter, and the used processing liquid outside thereof is suction-filtered.

[Problems to be solved by the device]

However, in the above-described structure of the filtering device, the area where the used processing liquid is actually suction-filtered is only the area of the portion where the sheet-shaped filter faces the holes provided in the sheet metal member, and other sheet-shaped filters. The area does not contribute to the filtering action. Further, since the suction force is concentrated on each hole, the sheet filter may be damaged.

Therefore, the present invention mainly aims to secure a wide effective filtration area of the sheet filter, and further, to prevent damage to the sheet filter as a second object.

[Means for Solving the Problems]

In view of the above-mentioned object, the present invention relates to a rotary drum that is rotatably supported by a machining fluid tank that stores used machining fluid, is immersed in the machining fluid, and has a plurality of holes formed all around the outer peripheral surface of the drum. A sheet filter wound around a predetermined angle range on the outer peripheral surface of the rotary drum from the filter supply unit and collected outside the machining liquid tank; and a sheet filter concentrically arranged inside the rotary drum. A fixed drum fixed to the working liquid tank with a plurality of holes provided only in a peripheral surface region facing the predetermined angular range of the winding, and both end surfaces being closed; and an axial direction of the rotating drum. And an annular seal member that seals a gap between the fixed drum and the fixed drum, and is provided along the generatrix direction at both circumferential ends of the circumferential surface region where the plurality of holes of the fixed drum are provided. A linear seal member that seals between the rotary drum and the rotary drum; and the sheet filter is separated from the surface of the rotary drum, and is provided over the entire circumference of the drum filter and the outer peripheral surface of the rotary drum. A spacer member that forms a multidirectional flow path along the surface of the rotary drum between the plurality of holes, and a direction in which the sheet-shaped filter is collected from the filter supply unit as the rotary drum rotates. Provided is a driving device for moving, a suction device for sucking the working liquid through the holes of the sheet filter, the spacer member, the rotary drum and the fixed drum, and a filtering device for the working liquid. To do.

Further, it is preferable that the spacer member is composed of a mesh member having a mesh size smaller than the holes formed on the outer peripheral surface of the rotary drum.

[Action]

Due to the interposition of the spacer member, only the portion of the area of the sheet-like filter facing the hole on the outer periphery of the rotary drum does not perform the filtering action, but the presence of multidirectional flow paths along the outer peripheral surface of the rotary drum. Therefore, the other area portion communicates with the hole on the outer periphery of the rotary drum, so that the other area portion also performs the filtering action.

Further, since the net member having a mesh size smaller than the hole formed on the outer circumference of the rotary drum is interposed immediately below the sheet filter, the suction pressure can be uniformly applied to the entire area of the sheet filter, and thus damage is prevented. Hard to happen.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings.

FIG. 3 and FIG. 4 show an embodiment of a conventional filtration device. Since the basic overall structure of the filtering device according to the present invention is the same as that shown in these drawings, the overall structure will be briefly described below.

In the machining fluid tank 12 in which the polluted machining fluid 10 is stored, a fixed cylindrical drum 50 is provided in the tank 12 so as to close both ends in the axial direction.
It is fixed to the side wall. On the outside of the fixed cylindrical drum 50, a rotary cylindrical drum 52 having a plurality of holes 60 provided over the entire area is arranged, and on the outer periphery of the drum 52, a sheet-shaped paper filter 22 from a supply roll 21 with a built-in brake is provided. Winding,
It is stretched and is finally discarded in the collection box 30 by the driving action of the roller 32. The fixed cylindrical drum 50 is provided with a plurality of holes 58 within a range corresponding to a region of the winding angle α of the paper filter 22. A hole is formed in the side wall of the working liquid tank 12 at one end of the fixed cylindrical drum 50, and a pipe 34 for connecting to the suction pump 28 and the clean tank is connected to the hole.

When suctioned by the suction pump 28 through the pipe 34,
The polluted processing liquid 10 is filtered by the paper filter 22 in the portion wound around the rotating cylindrical drum 52, and further, into the fixed cylindrical drum 50 through the hole 60 of the rotating cylindrical drum 52 and the hole 58 of the fixed cylindrical drum 50. Sucked. If this suction work is continued, the sludge 24 accumulates and adheres, and the suction efficiency decreases. In this case, if the rotary cylindrical drum 52 is rotated by the winding angle α in the direction of the arrow A after suctioning for a predetermined time, the working fluid can be filtered by the new filter portion, but the paper filter 22 does not actually filter. Only the portion of the rotary cylindrical drum 52 facing the hole 60 operates, and the remaining portion is wasted.

Therefore, in this embodiment, as shown in FIG. 1 and FIG. 2, a coarse mesh 70 having a rhombic mesh shape as a spacer member is provided on the outer periphery of the rotary cylindrical drum 52, and a fine mesh 72 is provided outside thereof. And paper filter 22 wire mesh
It is wound and stretched on the outside of 72.

Since the spacer member composed of the wire nets 70 and 72 is interposed between the rotary cylindrical drum 52 and the paper filter 22, a space is provided between the drum 52 and the paper filter 22.
74 is generated to form multidirectional flow paths of the suctioned working fluid along the outer peripheral surface of the rotating cylindrical drum. That is, in the region of the paper filter 22, the machining fluid flows not only in the streamline C direction from the portion facing the hole 60 formed in the rotary cylindrical drum 52, but is surrounded by one rhombus mesh. It flows like a streamline B from the entire region, and as a result, the effective filtering area of the paper filter 22 can be increased,
The filtration efficiency of the working fluid is high. Furthermore, in this embodiment, the wire mesh
Compared with the size of the diamond mesh of 70 and the hole 60 of the rotating cylindrical drum 52, the fine wire mesh 72 which is considerably fine is compared with the paper filter 22.
And the spacer member 70, the suction action of the paper filter 22 through the hole 60 of the rotating cylindrical drum 52 is received by the fine mesh 72 as a whole. Works over the entire area. Therefore, no local force acts on the paper filter 22, and the paper filter 22 is unlikely to break.

The size of the diamond mesh of the wire net 70 may be larger than the hole 60 of the rotary cylindrical drum 52, and,
The shape is not limited to the mesh shape and may be arbitrary. Therefore, for example, a wire may be wound around the rotary cylindrical drum 52 to have an appropriate roughness and used as a spacer member.

Further, even if the coarse mesh 70 is stopped and the mesh member having a mesh size smaller than the hole 60 is directly provided on the outer periphery of the rotary cylindrical drum 52, that is, the metal mesh 72 of this embodiment is interposed as a spacer member, substantially the same effect is obtained. Is obtained.

[Effect of device]

As is apparent from the above description, according to the present invention, the effective filtration area of the sheet-shaped filter can be ensured widely over a predetermined angle range of the outer peripheral surface of the rotating drum by securing the flow passages in multiple directions by the spacer member, and the suction suction Higher efficiency. Further, if a net mesh member having a fine mesh is used as a spacer member, it is possible to effectively prevent breakage of the sheet filter.

[Brief description of drawings]

FIG. 1 is a partially cutaway view showing the structure of a working fluid filtering device according to the present invention, which is a plan view of the drum portion of FIG. 3 seen from above, and FIG. Fig. 3 is a sectional view taken along the line II-II in the drawing, Fig. 3 is an elevational view showing an embodiment of the processing liquid filtering device, and Fig. 4 is a sectional view taken along the line IV-IV in the Fig. 3. 22 ... Paper filter, 28 ... Suction pump, 50 ... Fixed cylindrical drum, 52 ... Rotating cylindrical drum, 58 ... Hole provided in drum 50, 60 ... Hole provided in drum 52, 70 ... Coarse wire mesh, 72 ... Fine Wire mesh for eyes, 74 ... Channel space.

Claims (2)

[Scope of utility model registration request] 1. A rotary drum, which is rotatably supported by a machining fluid tank that stores used machining fluid and is immersed in the machining fluid, and a plurality of holes are provided all around the outer peripheral surface of the drum, and a filter supply section. A sheet-shaped filter wound around a predetermined angle range on the outer peripheral surface of the rotary drum and collected outside the processing liquid tank; and a sheet-shaped filter wound concentrically inside the rotary drum. A fixed drum provided with a plurality of holes only in the peripheral surface area facing the predetermined angle range and having both end surfaces closed and fixed to the working fluid tank; and a fixed drum at both ends in the axial direction of the rotary drum. And an annular seal member for sealing a gap between the fixed drum and the circumferential surface region of the fixed drum provided with a plurality of holes along the generatrix direction at both circumferential positions. A linear seal member that seals between the rolling drum and a plurality of holes that are provided over the entire circumference of the sheet filter and the drum outer peripheral surface of the rotary drum by separating the sheet filter from the surface of the rotary drum. And a spacer member that forms multi-directional flow paths along the surface of the rotary drum, and a drive device that moves the sheet-shaped filter in a direction of collecting from the filter supply unit as the rotary drum rotates. And a suction device for sucking the working liquid through the holes of the sheet filter, the spacer member, the rotary drum and the fixed drum, and a working liquid filtering device. 2. The working fluid filtration device according to claim 1, wherein the spacer member is a net member having a mesh size smaller than the holes formed on the outer peripheral surface of the rotary drum.