JPH0461903A - Apparatus for filtering processing solution - Google Patents

Abstract

PURPOSE:To make the title apparatus compact and to enhance the rigidity thereof by constituting a filtering part so as to have a drum shape. CONSTITUTION:A drum 16 is fixed so as to be immersed in a processing solution tank 12 having a used processing solution 10 stored therein and both end surfaces thereof are closed, and a large number of holes 20 are provided to the outer peripheral surface of the drum 16 over the predetermined angular range in the circumferential direction of the drum 16. A sheet-like filter 22 is provided so as to be wound around the drum 16 over the aforementioned predetermined angular range from a supply part 21 and recovered to the outside of the processing solution tank 12 in a state covering all of a large number of the holes 20. Further, the filter 22 is moved in the direction recovered from the supply part 21 by a drive apparatus 32. The processing solution is sucked in the drum 16 by a suction pump 28 through the filter 22 and a large number of the holes 20. As a result, a compact high rigidity processing solution filtering apparatus is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a filtration device for filtering various machining debris mixed into a machining fluid used during machining in a machine tool and regenerating the machining fluid.

[Conventional technology]

Conventionally, as a method for filtering contaminated machining fluid after use in machine tools, for example, the bottom of a machining fluid tank containing contaminated machining fluid is mostly formed by laying a roll-up sheet filter. The installed sheet filter is
Some filters are horizontally disposed directly below the processing liquid tank and placed on a conveyor having a large number of holes, and the sheet filter is also transported by the conveyance action of the conveyor. The lower side of the tank consists of a flat plate member whose upper surface has a number of holes through which the filtrate can fall, and is immersed in a suction tank filled with new machining fluid (or machining fluid after filtration). , the processing liquid is sucked and filtered from the suction tank by a suction pump.

[Problem to be solved by the invention]

However, the upper part of the suction tank is made up of the flat plate member that spreads horizontally as described above, which requires a large floor space, and the entire suction force is not received by the flat plate member that makes up the suction tank and the conveyor. When conveying paper, a large sliding friction acts between the conveyor and the flat plate member, making conveyance difficult.Furthermore, from the viewpoint of rigidity, the flat plate member must be made considerably thick, which reduces ease of use, cost, and It also had a major drawback in terms of floor space.

Therefore, an object of the present invention is to provide a processing fluid filtration device that is compact and highly rigid, allowing easy transportation of sheet-like filters.

[Means to solve the problem]

In view of the above object, the present invention provides a drum that is fixed so as to be immersed in a machining fluid tank storing used machining fluid, has both end faces closed, and has a plurality of holes extending over a predetermined angular range in the circumferential direction of the outer peripheral surface of the drum. a drum provided therein; a sheet-like filter that is wound around the drum over the predetermined angular range from the supply section, covers all of the plurality of holes and is collected outside the machining fluid tank; Provided is a processing fluid filtration device, comprising: a drive device that moves the processing fluid in a recovery direction; and a suction device that sucks the processing fluid into the drum through the sheet-like filter and the plurality of holes. do. In addition, a rotary drum is rotatably supported and immersed in a machining fluid tank that stores used machining fluid, and has a plurality of holes on the outer circumferential surface of the drum, and a rotating drum is wound around the rotary drum from a supply section, and A sheet filter to be collected outside the liquid tank, a drive device that moves the sheet filter in a direction in which it is collected from the supply section along with the rotation of the rotating drum, and other parts of the rotating drum that are not covered by the sheet filter. a sealing means for preventing external machining fluid from entering into the rotating drum from a region; and a suction device for sucking the machining fluid into the rotary drum through the sheet-like filter and the plurality of holes. A processing fluid filtration device is provided.

[For production]

First, in the first configuration, the contaminated machining fluid is sucked into the drum through a plurality of holes provided on the outer peripheral surface of the drum through a sheet-like filter, and a filtered machining fluid is obtained.

In order to prevent clogging, the sheet filter is fed by a drive device as appropriate, and a new portion is supplied to the outer periphery of the drum.

In the second configuration, the sheet-like filter is wound around the outer periphery of the rotatable drum, so that it can easily rotate together with the drum and supply a new portion of the filter into the machining liquid tank. In other words, due to its mechanical properties based on its shape, the drum has higher rigidity under the action of hydrostatic pressure than a flat member, and when transporting a sheet filter, the hydrostatic pressure acting on the drum cancels each other out in the radial direction. Therefore, only a small amount of torque or power is required to rotate the drum and convey the sheet filter. Therefore, the machining liquid can be filtered with sufficient suction force. Furthermore, the sealing means can prevent contaminated machining fluid from entering from areas of the rotating drum that are not covered by the sheet filter.

〔Example〕

The present invention will be described in more detail below based on embodiments shown in the accompanying drawings.

1 and 2 show a first embodiment (corresponding to claim 3) of a filtration device according to the present invention. A cylindrical drum 16 having a pipe 14 serving as a rotating shaft is rotatably immersed in a machining fluid tank 12 that stores used contaminated machining fluid so as to be rotatable about a horizontal axis 32. The mounting structure is such that the pipe 14 is attached to the side wall of the tank 12 via a seal member 15.
is attached so that it can rotate at low speed. This cylindrical drum 16 is closed at both ends in the longitudinal direction by disk members 18, and a sheet-like filter 22 such as a paper filter is wound around the drum surface within an angle α.
A plurality of holes 20 are provided. The sheet filter 22
The winding is wound and stretched at an angle α to the outer periphery of the cylindrical drum 16 so as to cover all of the plurality of holes 20. The sheet-like filter 22 is wound around the cylindrical drum 16 from a supply roll 21 with a built-in brake, and is stretched around the cylindrical drum 16.
With the rotation in the direction of arrow A, the used filter 22 is collected into the collection box 30 by the pulling force of the drive roller 32 and discarded, and a new filter is sent from the roll section to the outer periphery of the cylindrical drum 16.

A pair of drive rollers 32 are provided at each end of the sheet filter in areas where sludge does not accumulate.

The pipe 14, which also serves as the rotation shaft, is connected to an external pipe 34 via a so-called rotation joint 26, and filters the contaminated machining fluid 10 by the suction force of the suction pump 28. That is, the filtered machining fluid enters into the cylindrical drum 16 by the suction force of the suction pump 28 through the sheet filter 22 and the holes 20 provided in the drum surface of the cylindrical drum 16, and clean machining fluid is removed. It is sent to a clean tank (not shown) where it is stored. If such filtration continues, contaminant components in the machining liquid will accumulate on the sheet-like filter 22 wound around the cylindrical drum 16 and become sludge 24, reducing the filtration efficiency. Therefore, it is necessary to replace part of the filter with a new one (the cylindrical drum 16 is rotated once. Before this rotation, the rear region L6a of the cylindrical drum 16 where the sheet filter 22 is not wrapped around does not have holes. Although the surrounding contaminated machining fluid did not enter, if there is a suction action by the suction pump 28 while the cylindrical drum 16 is rotating, the external contaminated machining fluid may enter into the cylindrical drum 16 through the hole 20. Therefore, it is necessary to interrupt the suction only while the cylindrical drum 16 is rotating.

The clogging of the sheet filter 22 is detected manually by the control means 36 by detecting an increase in suction pressure using a pressure gauge or by detecting time using a timer. The control means 36 stops the suction pump 2B and rotates the drive roller 32. As the sheet filter 22 is fed, the cylindrical drum 16 is rotated, and when the dog 17 provided on the pipe 14 of the rotary shaft depresses the limit switch 19, it detects that the cylindrical drum 16 has made exactly one rotation, and sends the signal to the control means 36. send. Then, the control means 36 stops the drive roller 32 and starts the suction pump 2.
8, and the filtration action is restarted.

Next, a second embodiment (corresponding to claim 1) will be described.

In FIGS. 1 and 2, the cylindrical drum 16 is connected to the tank 12.
This corresponds to a configuration in which the sheet-like filter 22 is fixed to the drive roller 32 and is fed by the drive roller 32. In this case, relative slippage occurs between the sheet filter 22 and the cylindrical drum 16. Needless to say, the sheet filter 22 should be selected to be able to withstand the resistance force of this relative sliding.

This eliminates the need for the control means 36, the dog 17, the limit switch 19, etc., and eliminates the need to control the operation of the drive roller 32 and suction pump 28 as in the first embodiment. In other words, suction can be performed at all times, and the sheet filter 22 can also be constantly fed at a low speed.

Next, FIGS. 3 and 4 show a third embodiment (corresponding to claim 4) of a filtering device according to the present invention.

A fixed cylindrical drum 50 is fixed to a side wall of the machining fluid tank 12 in which the contaminated machining fluid 10 is stored so as to close both ends in the axial direction. A rotating cylindrical drum 52 having a plurality of holes 60 over the entire area is disposed outside the fixed cylindrical drum 50, and a sheet-like filter 22 is disposed around the outer periphery of the drum 52, as in the case of the first embodiment. is being rolled up and stretched. The fixed cylindrical drum 50 is provided with a plurality of holes 58 in which the filter 22 is wound within a range corresponding to the angle α. In order to prevent the contaminated machining fluid from directly entering the fixed cylindrical drum 50 through the gap without passing through the sheet filter 22, seal members 54 and 56 are used at four locations.

That is, both ends of the rotating cylindrical drum 52 and the fixed cylindrical drum 5
0 and the gap between the two cylindrical drums, the sheet filter 22 is wound at angular positions near both ends of the area of angle α, along the generatrix of the drum, respectively. A linear sealing member 56 is provided.

Furthermore, the area 50a of the fixed cylindrical drum 50 except for the angle corresponding area is not provided with holes 58, and together with the sealing members 54 and 56, forms the sealing means described in claim 2. . Further, a hole is provided at one end of the fixed cylindrical drum 50 in the side wall of the machining liquid tank 12, and a pipe 34 for connecting to a suction pump and a clean tank is connected to the hole.

When suctioned by the suction pump through the pipe 34,
The contaminated processing liquid 10 is filtered by the sheet-like filter 22 that is wrapped around the rotating cylindrical drum 52, and is further filtered into the fixed cylindrical drum 50 through the holes 60 of the rotating cylindrical drum 52 and the holes 58 of the fixed cylindrical drum 50. is attracted to.

If this suction operation is continued, the sludge 24 will accumulate and adhere, reducing the suction efficiency.

Therefore, if the rotating cylindrical drum 52 is rotated by the winding angle α in the direction of arrow A after suction has been carried out for a predetermined period of time, the machining liquid can be filtered by a new filter portion.

Also, due to the very low speed rotation, the rotating cylindrical drum 52
may be constantly rotating. In any of these methods, there is no need to interrupt the suction as in the case of the first embodiment, and it can be said that the operating efficiency of the apparatus is high.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, since the filtration portion is formed into a drum shape, the device can be made more compact and the filtration area can be increased.

In addition, suction force acts on the drum member in its radial direction,
Therefore, the suction forces generally cancel each other out, and the torque or power required to rotate the drum for conveying the sheet filter can be extremely small. Additionally, compared to flat or box-shaped drums, drums inherently have greater strength, so combined with the above-mentioned counteracting effect, the suction force can be further increased, which in turn increases filtration efficiency. .

[Brief explanation of drawings]

FIG. 1 is a side view of a filtration device according to the present invention, and FIG.
3 is a side view showing another embodiment of the filtration device according to the present invention, and FIG. 4 is a sectional view taken along the arrow line IV-IV in FIG. 3. 10... Dirty processing liquid, 12... Processing liquid tank, 14... Rotating shaft pipe, 16... Rotating drum, 20.58/60... Hole, 22... Sheet filter, 28 ... Suction pump, 32... Drive roller,
36...Control means, 50...Fixed cylindrical drum, 52...Rotating cylindrical drum, 54.56...Seal member, α...Wrap angle.

Claims (1)

[Claims] 1. The drum is fixed so as to be immersed in a machining fluid tank storing used machining fluid, both end faces are closed, and a plurality of holes are provided over a predetermined angular range in the circumferential direction of the outer peripheral surface of the drum. a sheet-shaped filter that is wound around the drum over the predetermined angular range from the supply section, covers all of the plurality of holes and is collected outside the machining fluid tank; and the sheet-shaped filter is collected from the supply section. What is claimed is: 1. A processing fluid filtration device comprising: a drive device that moves the processing fluid in a direction in which the processing fluid is filtered; and a suction device that sucks the processing fluid into the drum through the sheet-like filter and the plurality of holes. 2. A rotary drum that is rotatably supported and immersed in a machining fluid tank that stores used machining fluid and has a plurality of holes on its outer circumferential surface; A sheet filter that is collected outside the liquid tank,
a drive device that moves the sheet-like filter in the direction of collection from the supply section as the rotary drum rotates; and a drive device that moves the sheet-like filter in the direction of recovery from the supply section as the rotary drum rotates; and a suction device that sucks the machining fluid into the rotating drum through the sheet filter and the plurality of holes. . 3. A rotating drum that is rotatably supported and immersed in a machining fluid tank that stores used machining fluid, both end faces are closed, and a plurality of holes are provided over a predetermined angular range in the circumferential direction of the outer circumferential surface of the drum. a sheet-like filter that is wound around the rotating drum over the predetermined angular range from the supply section, covers all of the plurality of holes and is recovered to the outside of the machining fluid tank; a drive device that moves the machining liquid from the supply section in the direction of collection; a suction device that sucks the machining fluid into the rotating drum through the sheet filter and the plurality of holes; 1. A processing fluid filtration device comprising: control means for stopping the device, stopping the drive device after one rotation, and starting the suction device. 4. A rotary drum that is rotatably supported and immersed in a machining fluid tank that stores used machining fluid, and has a plurality of holes all around the drum's outer circumferential surface, and a supply section that supplies a predetermined portion of the outer circumferential surface of the rotary drum. A sheet-like filter that is wound over an angular range and collected outside the processing liquid tank; and a sheet-like filter that is arranged concentrically inside the rotating drum and that faces a predetermined angular range in which the sheet-like filter is wound. A fixed drum provided with a plurality of holes and fixed at both end faces with respect to the processing liquid tank, and a gap between the fixed drum at both ends of the rotary drum in the axial direction is sealed. an annular sealing member; a linear sealing member that is provided along the generatrix direction at both circumferential end positions of the area provided with the plurality of holes of the stationary drum, and seals between the rotary drum and the rotary drum; a drive device that moves the sheet-like filter in a direction of recovery from the supply section as the rotating drum rotates; and suctioning the machining liquid into the fixed drum through the sheet-like filter and holes in the rotating drum and the fixed drum. A processing fluid filtration device characterized in that it is equipped with a suction device.