JP2018008333A - Filtration drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filtration drum with a filtration filter having a hardly damaged strong structure capable of securely removing chips adhered to the filtration drum.SOLUTION: A filtration drum for filtering discharged used coolant liquid having mixed chips (dirty liquid) comprises: a center mesh layer arranged in the center; and an inner mesh layer and an outer mesh layer sintered to sandwich the center mesh layer from inside and outside, respectively. The inner mesh layer and the outer mesh layer are formed to have larger mesh holes than mesh holes of the center mesh layer.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a filtration drum that filters out a clean liquid from used coolant liquid discharged from a machine tool such as a lathe or a milling machine.

  In machine tools such as lathes and milling machines, cutting fluid (coolant fluid) is supplied to the machining area where the cutting tool such as a cutting tool or cutter and the workpiece (workpiece) come into contact with each other to suppress the heat generation of the machining area. The wet type to perform has become mainstream. In this wet type machine tool, a filtration drum having filtration means is permanently installed. The filtration drum separates and discharges chips (unnecessary material removed from the workpiece) from the used coolant liquid (dirty liquid) discharged from the machine tool. Recycled into clean coolant liquid (clean liquid) from which chips have been removed, and returned to the machine tool. In this specification, metal scraps or metal scraps that have been removed from workpieces by machining of machine tools are defined as chips. Regardless of beard shape, curl shape, small lump shape, powder shape, or sludge shape. It is expressed as chips.

  Filters that remove clean liquid from the used coolant liquid (dirty liquid) that is placed on the chip conveyor device and discharged from the machine tool with mixed chips are examples of rotating drum filters, cyclone separators, and magnet filters. It is done. The rotating drum filter rotates the outer periphery of the rotating drum by rotating a cylindrical rotating drum with a mesh formed of metal wire (wedge wire) or punching metal around the horizontal axis in a dirty tank containing dirty liquid. The cutting fluid is filtered to the inside of the rotating drum while keeping chips on the mesh surface, and the clean fluid is filtered from the inner side of the rotating drum to the horizontal axis direction (lateral direction) and adjacent to the clean tank Drain in. The cyclone separator pours the dirty liquid discharged from the machine tool mixed with chips under pressure from the inlet on the side of the case, generates a spiral flow (cyclone) inside the case, and separates the clean liquid. The concentrated dirty liquid is discharged downward from the separation discharge port (dirty liquid discharge port) at the lower end of the casing while being discharged above the cyclone separator. The magnet filter discharges the clean liquid out of the magnet filter while retaining iron chips on the magnetic body incorporated in the housing. Each of these filters separates and removes the clean liquid from a part of the dirty liquid.

  In the chip conveyor apparatus, chain conveyors, coil-type conveyors, screw-type conveyors, and the like can be cited as examples of the conveyance mechanism that separates and conveys the chips from the used coolant liquid that has been discharged from the machine tool. A chain conveyor has a plurality of plate plates that continuously convey dirty liquid discharged from a machine tool mixed with chips, and spans between a drive shaft and a driven shaft. The cutting fluid is passed below the plurality of plate plates while being discharged from the total discharge port above the conveyor while being conveyed on the plate. As the chip conveyor mechanism of the chain conveyor, there are a scraper type conveyor in which a scraping member (scraper) for scraping scraps is attached to a conveyor belt, and a magnet type conveyor in which a magnet is attached. The screw type conveyor rotates the screw with a spiral propeller above the rotating shaft, compresses the chips while conveying them, and discharges them from the discharge port above the conveyor. Is moved down the conveyor. The coil conveyor compresses chips while conveying them with a rotating shaft formed in a spiral coil and discharges them from the discharge port above the conveyor. It is to be moved. In any of these transport mechanisms, the cutting fluid is moved below the conveyor while moving the chips to the discharge port above the conveyor, and the chips are separated and removed from the dirty liquid.

  In the conventional chip conveyor apparatus, the size (area) of the transport path is increased in order to increase the processing capacity of the used liquid discharged by mixing the chips. On the other hand, there are a wide variety of specifications such as the shape, material, and surface roughness of the workpiece (workpiece) processed by the machine tool, and there is a large amount of chips generated from the workpiece depending on the progress of processing. Unlikely, the amount of cutting fluid (coolant) to be supplied greatly increases or decreases according to the heat generation amount of the workpiece. In other words, the amount of dirty coolant liquid discharged from the machine tool as a result of mixing of chips suddenly increases or decreases, and the ratio of chips in the dirty coolant liquid usually varies greatly. In order to cope with this sudden increase / decrease in the amount of dirty coolant liquid, a large-size transport path with a margin is provided in accordance with the instantaneous maximum value of the amount of dirty coolant liquid discharged from the machine tool. Or the capacity of the dirty liquid tank for temporarily storing the dirty coolant liquid must be sufficiently increased, or both of them must be carried out. In any case, according to a known method, a large filtration drum. There is a concern that it becomes.

  The rotating drum filter has a drawback that the mesh is easily clogged, but is suitable for filtering out the dirty liquid and taking out the clean liquid. A conveyance mechanism such as a screw type conveyor is suitable for discharging chips as compressed chips while conveying the chips. For this reason, a filtration drum in which clogging of a mesh is eliminated by an air injection nozzle or a cleaning liquid injection nozzle after combining these two. (Patent Document 1 and Patent Document 2).

  Patent Document 1 includes a rotating drum having a mesh formed on the outer periphery of a cylindrical shape, and a screw type conveyor is arranged coaxially with the rotating drum, and chips on the inner peripheral side of the rotating drum at predetermined intervals in the rotation direction. An apparatus having a configuration in which a rake plate is disposed and a gutter communicated with an inflow pipe is disposed below the screw type conveyor. In Patent Document 1, the dirty liquid supplied from the inflow pipe is collected through a clean tank disposed below by being filtered through the mesh of the rotating drum through the hole in the tub, and as a clean liquid. When the chip slab disposed on the inner peripheral side of the rotating drum scoops the accumulated chips and reaches the upper part, the chips fall and are received and conveyed by the screw conveyor and discharged. The outside of the rotating drum is provided with either one or both of an air injection nozzle and a cleaning liquid injection nozzle, and the mesh of the rotating drum is clogged by injecting air or cleaning liquid. There is a description that it will be resolved (see detailed explanation of the device).

In Patent Document 2, a scraper type conveyor having a rotating drum having a mesh formed on the outer periphery of a cylindrical shape and having a scraper plate attached to a conveying belt is passed through the rotating drum, and an intermediate plate is provided below the conveying belt. An apparatus having a configuration in which is arranged is described. In Patent Document 2, the supplied dirty liquid passes through a hole in the intermediate plate, is filtered through the mesh of the rotating drum, is collected as a clean liquid, and is collected in a clean tank disposed below. There is a description that when the chips accumulated on the inner peripheral side of the drum are at the top, the chips fall on the intermediate plate, are received by the scraper type conveyor, and are discharged. There is a description that one or both of an air injection nozzle and a cleaning liquid injection nozzle are provided outside the rotating drum, and the clogging of the mesh of the rotating drum is eliminated by injecting air or cleaning liquid (paragraph) 0017-paragraph 0020 etc.).
In Patent Document 1, as a coolant cleaning device 10 that efficiently separates coolant and chips at a low cost, a first tank 21 that stores coolant and separates chips and coolant remaining in the coolant. And a micro compressed air pump 23 for generating micro bubbles in the first tank 21 for adsorbing to the chips remaining in the coolant and causing the chips to float on the coolant level, and filtering in the first tank 21. The first tank recovery device 31 that recovers the remaining chips near the coolant level together with the coolant, and the remaining chips are removed from the coolant recovered by the first tank recovery device 31 and separated from the remaining chips. And a filter device 41 for returning the coolant to the first tank 21.
The applicant of the present application has applied for Patent Document 3 (Japanese Patent Application Laid-Open No. 2015-9338), and the content thereof is a novel filter drum in which a filter drum and a transport tray are combined, which eliminates the drawbacks of a cylindrical drum. The filtration drum 3 has a simple structure, and filters and transports the chips while compressing the chips in the filtration drum 3 that filters the dirty liquid by the mesh 31 arranged around the rotation shaft and the conveyance tray 50b inserted through the filtration drum 3. A coil conveyor 51 for discharging from the discharge port of the road and a driving means 8M for driving them are provided. The filtration drum 3 has a regular polygonal shape in the rotation axis direction, and the dirty liquid supplied into the filtration drum 3 is It is filtered by the mesh 31 and taken out as a clean liquid, and the chips in the filtration drum 3 are transported upward as the filtration drum 3 rotates. Is discharged is conveyed compressed by fall into the conveyance tray 51 coil conveyor 51.

Furthermore, with respect to an apparatus for cleaning a dirty coolant liquid in which ultrafine bubbles such as microbubbles and nanobubbles are generated and chips are mixed, those related to Patent Document 4 and Patent Document 5 are disclosed.
Patent document 4 separates coolant and chips efficiently and at low cost. This coolant cleaning device 10 stores coolant and separates chips and coolant remaining in the coolant. The first tank 21, a micro compressed air pump 23 that generates microbubbles in the first tank 21 for adsorbing to the chips remaining in the coolant and floating the chips on the coolant level, and the first tank 21. The first tank recovery device 31 that collects the remaining chips near the coolant level filtered in the tank together with the coolant, and the residual chips are removed from the coolant recovered by the first tank recovery device 31 and the remaining chips. A filter device 41 for returning the coolant separated from the waste to the first tank 21;
Patent Document 5 provides a water treatment apparatus and a water treatment method that can effectively remove contaminants (for example, organic matter) contained in treated water, and a micro / nano bubble generating unit that generates micro / nano bubbles in treated water. 43 or a nanobubble generating part 42 for generating nanobubbles, a second tank 15 for introducing treated water after the generation of micro-nanobubbles or nanobubbles, and a treated water introduced into the second tank 15 are provided in contact with each other. And a carrier 16 made of polyvinyl alcohol. The carrier 16 has pores, and microorganisms are immobilized above the carrier 16.
Furthermore, in Patent Document 6, a filtration filter 20 that filters solids and liquids from a contaminated liquid after use in an industrial machine is provided in an opening 2 formed on the outer peripheral surface of a cylindrical filter drum that is driven to rotate. A chip conveyor having a filtration drum 1 which is detachably attached to the filter drum, wherein the filtration filter 20 is made of metal and is located on the outside of the filtration drum. A second plain weave mesh 16 located on the inside and having a mesh larger than the first plain weave mesh 15 is sintered and brought into close contact, and the second plain weave mesh 16 is composed of the first plain weave mesh 16. What is comprised by the member thicker than the net | network 15 is disclosed. The first plain weave mesh 15 and the second plain weave mesh 16 are sintered and brought into close contact with each other, but are attached via a frame 30 to constitute a filtration drum.

Japanese Patent Laid-Open No. 5-116734 JP-A-8-283734 Japanese Patent Laying-Open No. 2015-9338 JP2013-163249A JP 2009-195887 A JP 2007-83105 A

In Patent Document 6, two mesh layers are sintered, but are attached via a frame body (four surrounding frame bodies 30), and only the mesh layer is not intended to maintain strength. In addition, there is a problem that smaller chips cannot be separated and removed efficiently or chips enter between the frames (fine chips cannot be removed stably for a long time).
The filtration drum needs to pick up chips or carry it upward and drop it by the spraying means. For this purpose, the filtration drum needs to be variously deformed accordingly (see Patent Document 3). However, even in that case, it is required to efficiently separate and remove smaller chips with sufficient strength. That is, in the filtration drum that discharges chips, an ejection unit is provided on the outside or inside of the filtration drum, and air is ejected or cleaning liquid is ejected. In some cases, back washing may be performed. For this reason, the filtration drum needs to correspond to these, and it is necessary to make the structure suitable for these structures in order to capture and circulate the chips with the filter on the outer periphery and blow off the chips by the injection means. There is.
However, the conventional injection means has a problem that a high output is required to increase the injection efficiency and the cost is increased. Moreover, although it conveys upwards with the structure of the mesh-shaped hole of the said filtration drum, the situation which falls before conveying upwards (directly above) is produced.
Furthermore, although the accuracy of the filtration drum is related to efficiently separating and removing smaller chips, there is a problem that even a plurality of mesh layers enter the plurality of gaps (overlapping gaps).

  Therefore, an object of the present invention is to provide a filtration filter having a strong structure with little damage and capable of reliably removing chips adhering to the filtration drum.

The filtration drum of the present invention forms a mesh-like hole for filtering out the used coolant liquid (dirty liquid) discharged from the machine tool such as a lathe or a milling machine to remove the clean liquid and discharge the chips. The filtration drum includes a central mesh layer located in the center, and an inner mesh layer and an outer mesh layer that sandwich the central mesh layer from the inside and the outside, and these layers are sandwiched by sintering. The inner mesh layer and the outer mesh layer are formed in larger mesh holes than the mesh hole of the central mesh layer. Here, the drum filter is preferably a metal wire (wedge wire) or a punching metal. The mesh hole is preferably a metal wire such as stainless steel or copper.
According to the present invention, a plurality of mesh-shaped pore layers are sintered using a metal wire or the like, and dirt is not mixed between the layers of the plurality of mesh-shaped pores. Thus, a mesh structure in which a predetermined strength is maintained with only a mesh layer without using a frame as in the prior art. That is, the inner mesh layer and the outer mesh layer become reinforcing members (members to be sandwiched) to reinforce the central mesh layer by sandwiching and serve as a filtration filter.

According to the present invention, the mesh-shaped hole of the central mesh layer is a mesh-shaped hole serving as a reference for filtering chips of a predetermined size, and the inner mesh layer and the outer mesh layer are the size of the mesh-shaped hole. And one of them is smaller than the other. For example, assuming that the size of the chips removed by the mesh of the filtration drum is 10 to 30 μm, it is preferable that the size of the mesh-shaped hole of the central mesh layer is set to the 200 to 600 mesh that is five times or more. .
According to the present invention, the inner mesh layer and the outer mesh layer serve as reinforcing members (clamped members) to reinforce the central mesh layer, and the central mesh layer serves as a filtration filter. And, for example, if the size of the chips removed with the mesh of the filtration drum is 10 to 30 μm, it is preferable that the size of the mesh-like hole of the central mesh layer is the 200 to 600 mesh, Thus, when the size is 5 times or more, the center mesh layer is reinforced, and when it is 15 times or less, the center mesh layer serves as a filtration filter.
Also, the inner mesh layer and the outer mesh layer have different mesh-shaped holes, and one of them is formed smaller than the other in order to control the amount of the dirty liquid passing therethrough. Therefore, for example, when the used coolant liquid (dirty liquid) is filtered from the outside to the inside, the flow rate is controlled when passing through the inside mesh with small mesh holes from the outside (control in the direction of stopping) The accuracy of filtration is improved.

According to the present invention, the mesh-shaped hole of the central mesh layer is 200 to 600 mesh, and the mesh of the inner mesh layer disposed on the inner side and the mesh-shaped hole of the outer mesh layer disposed on the outer side are the central holes. The diameter of the wire in the central mesh layer is smaller than the diameter of the wire in the inner mesh layer and the outer mesh layer, and is 5 to 15 times smaller than the mesh hole. And filtering chips of 10 to 30 μm.
According to the present invention, the inner mesh layer and the outer mesh layer share the role of the conventional frame (see Patent Document 3) with the mesh-shaped hole, and this is used as the outer mesh layer and the inner mesh layer. When it is sandwiched between and sintered, it becomes a high-strength filter. As a result of the experiment, the center mesh layer (when the mesh-like pores are 200 to 600 μm, 10 to 30 μm of chips (particles) can be stably filtered so as to be 90% or more. The filtration filter of the structure has high filtration accuracy and is strong by clamping, and is compressed and discharged while being sent to the discharge port in the subsequent compression process (conveyance by a rotary conveyor).

According to the present invention, the filtration drum is formed into a U-shaped continuous shape projecting to the outer periphery at a predetermined interval in the rotation axis direction, or is formed into a square shape, and the ejection unit corresponds to these projecting positions. It is characterized by being arranged. As this U-shape, a continuous oval shape with a fan shape spreading toward the chip discharge side is effective for both chip collection and discharge by the injection means, and damages the mesh. It is a difficult shape.
According to the present invention, the three-layer structure of the mesh-shaped holes is strong even if it is bent into a square shape or a substantially U-shaped shape, and the chips attached to the square-shaped or U-shaped portion. Can be effectively separated and removed, and a structure with high filtration accuracy can be obtained.
The mesh structure of the filtration drum according to the present invention efficiently removes dirt (oil dirt) adhering to the chips by generating bubbles when jetting a coolant containing compressed air. be able to. That is, the generation of bubbles is improved, and the cleaning effect of the mesh structure itself is exhibited as well as the cleaning of chips.
Further, the present invention includes an injection unit that removes chips adhering to the outside or the inside of the filtration drum, and the injection unit removes the chips by injecting the coolant into the cleaning liquid or air. And when the jetting means jets and removes chips from the inside to the outside of the filtration drum, the mesh-like holes of the outer mesh layer are formed larger than the mesh-like holes of the inner mesh layer, and the jetting means When the chips are ejected and removed from the inside to the outside of the filtration drum, the mesh holes of the outer mesh layer are formed larger than the mesh holes of the inner mesh layer.
According to the present invention, chips can be efficiently discharged with a structure in which chips are easily separated and removed from the filter of the filtration drum by the injection of the injection means.
In the present invention, it is preferable that the mesh of the filtration drum is made of a metal such as stainless steel or copper, and the center mesh layer and the mesh layers positioned inside and outside thereof are arranged so as to intersect each other. In this case, the direction of the plain weave or twill mesh is crossed, the direction of the plain weave and plain weave is crossed, the center mesh layer is made of thick metal wire, and the inner and outer mesh layers are It is preferable that thin metal wires are used so that they intersect.

According to the present invention, the above-mentioned three-layered structure is strong and effective in cleaning and separating chips, resulting in a mesh structure having a high cleaning effect on the mesh structure itself. Even when the mesh layer is high in strength and bending is required, the mesh structure maintains a predetermined strength. In addition, by sintering the three-layer structure, if the smallest mesh-shaped hole on the outside or inside is used as a reference for filtration removal, chips having that size can be reliably separated and removed. In other words, it plays the role of a filtration filter while increasing the bonding strength by sintering, and the outer and inner mesh layers sandwiching the central mesh layer prevent the situation where too large chips contact the central mesh layer. Further, since the flow rate of the dirty liquid can be limited, the momentum of the jetting by the jetting means can be controlled, and the chip can be formed in the direction in which the chips are easily dropped, the separation and removal accuracy can be improved.
Further, according to the present invention, when coolant liquid containing compressed air from the injection means is mixed into the water storage region, the used coolant liquid (dirty liquid) attached to the chips is separated and removed by generating ultrafine bubbles. A filtration drum having a high cleaning effect can be provided.

It is a structural diagram which shows the internal structure of the filtration drum of the 1st Embodiment of this invention from the side surface side. It is a structural diagram which shows the internal structure of the filtration drum of the said embodiment from the back side. It is a figure explaining the positional relationship of the injection means and filter drum of the said embodiment, Fig.3 (a) is a front view, FIG.3 (b) is a side view. It is structural drawing which shows the filtration drum of the 2nd Embodiment of this invention. It is structural drawing which shows the other example of the filtration drum of the said 2nd Embodiment. It is structural drawing which shows the other example of the filtration drum of the said 2nd Embodiment. It is the photograph of the mesh structure which copied the substantially U-shaped protrusion part of the filtration drum of the said 2nd Embodiment. It is a particle size distribution map of the separated clean liquid filtered by the filtration drum of the second embodiment. It is sectional drawing explaining the conventional filtration drum.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. In this embodiment, a used coolant liquid (dirty liquid) discharged from a machine tool such as a lathe or a milling machine is described as an object to be filtered indicated by reference numeral L1.

(Chip conveyor device)
1A and 1B are structural views showing a chip conveyor device 1 according to an embodiment of the present invention. FIG. 2 is a structural diagram showing the internal structure of the filtration drum 3 of the present embodiment from the back side. FIGS. 3A and 3B are views for explaining the positional relationship between the filtration drum 3 and the ejection unit 81 of the present embodiment, FIG. 3A is a front view, and FIG. 3B is a side view. FIG. 4 shows another example of the present invention, which is different from FIG. 1 in the direction in which the coolant cleaning liquid and the compressed air pump Mv1 are merged.
In the present embodiment, the filtration drum 3 is disposed in the housing 2, and is a rotary type that conveys the chips Z while compressing the chips Z in the conveyance tray 50 b inserted through the filtration drum 3 and discharges the chips Z from the discharge port of the conveyance path 5. Coil conveyor 51 and driving means (motor) M for driving them. The filtration drum 3 filters the dirty liquid L1 through a mesh 3m disposed around the rotation axis. The mesh of the rotary filter can have a double or triple structure, and in this embodiment, the mesh has a triple structure in which meshes having different mesh sizes are joined by sintering. The drum filter 3m is a rotating drum having a mesh formed on its outer periphery with a metal wire (wedge wire), punching metal, or the like. The cutting fluid is filtered to the inside of the rotating drum 3 while being clamped to obtain a clean cutting fluid, and the filtered clean cutting fluid is discharged from the inner side of the rotating drum in the horizontal axis direction (lateral direction) and discharged into the clean tank 2. .

  In the example shown in FIG. 1, a coil conveyor 51 is disposed in the center of the rotary filter drum 3 in a predetermined pipe 50 b and is driven by a drive motor M on the back side. When the conveyor 51 is driven to rotate, the chips collected by the collection hopper 7 are discharged while being compressed. Further, on the back side of the coil conveyor 51, a drive shaft J is disposed in a predetermined pipe line (conveyance tray) 50b. The pipe line 50b collects used coolant liquid (dirty liquid) L1 discharged from a machine tool such as a lathe or a milling machine and is drawn into the inside of the filtration drum 3 and below the filtration drum 3. It is discharged to the side and enters the area of the water storage state W. Reference numeral F1 represents a supply path of used coolant liquid (dirty liquid) discharged from a machine tool such as a lathe or a milling machine to the filtration drum 3 (FIG. 1). The motor M and the filtration drum 3 are belt-driven, gear-driven, or chain-driven. Similarly, the motor M and the rotary conveyor 51 are driven by a belt, a gear, or a chain.

Above the filtration drum 3, a coolant cleaning liquid supply pipe 81 and an injection nozzle 811 are attached. Water (coolant liquid) A9 to be injected is supplied to the supply pipe 81, and compressed air is added by the compressed air pump Mb to be supplied to the supply pipe A9 for injection. In the example of FIG. 4, the compressed air can be directly directed to the injection means 811 and can be supplied.

The compressed air pump Mv1 of the present embodiment includes supply means for supplying air or gas, and the coolant liquid from the coolant storage tank is injected. As the compressed air pump Mv1, it is possible to supply a small amount of air that can be supplied to a water tank used for breeding tropical fish, but a gas-liquid two-phase swirl type may also be used. The gas-liquid two-phase flow swirl type utilizes a phenomenon in which a water flow is generated to generate a vortex, a gas (large bubble) is entrained in the vortex, and the bubble breaks apart when the vortex is collapsed. Ultrafine bubbles have an excellent effect of cleaning oil and the like by the force of ions present at the interface. In addition, the compressed air pump Mv1 can be replaced with a drain cap having a connection port, and a drain valve can be attached. Further, a constant flow device can be attached using a joint, and an actuator is installed to adjust the air supply as an automatic valve. You may go.

  In the present embodiment, the cleaning liquid A9 is discharged for a predetermined time at a timing at which each top of the filtration drum 3 is directly above the transport tray 50a, so that it can be easily dropped into the transport tray 50a at a more accurate position. Yes. The predetermined timing can be easily detected by arranging a contact sensor such as a micro switch or a non-contact sensor such as an optical sensor in the vicinity of the upper side of the filtration drum 3.

Above the filtration drum 3, a coolant liquid supply pipe 81 and a nozzle 811 that is an injection unit are arranged to inject the mesh 3 m of the filtration drum 3 downward from the outside. According to this embodiment, Then, the mesh surface 31 of the filtration drum 3 is periodically cleaned while the chips Z carried upward along with the rotation of the filtration drum 3 are surely dropped into the transport tray 50b. As the injection nozzle 811, the cleaning liquid and the compressed air Ar are separately pumped and mixed in the vicinity of the nozzle or the nozzle 811, and when the jetting is performed, the cleaning water is atomized by gas expansion, or the compressed cleaning water has a diameter. A structure in which injection is performed from an injection nozzle having an orifice of several hundred μm can be employed.
In the present embodiment, the dirty liquid L1 supplied from the inflow pipe into the filtration drum 3 is filtered through the mesh 3m, becomes the clean liquid L9, is stored in the clean tank, is taken out from the discharge pipe 91, and is filtered. 3 is moved upward with the rotation of the filtration drum 3 and falls into the transport tray 50b, and is discharged out of the machine as the compressed scrap Z transported by the coil conveyor 51. (FIGS. 1 and 2).

  FIG. 5 is a view showing another example of the filtration drum 3 according to the filtration drum 3 of the above embodiment, FIG. 5 (a) is a front view, and FIG. 5 (b) is a side view. In the example shown in FIG. 5, the filtration drum 3 is provided with a U-shaped protrusion Dt in the rotation axis direction, and the filtration area is increased while increasing the number of arrangement of each top (projection) Dt in the filtration drum 3. Easy to do. As this U-shape, it is a fan-shaped fan that spreads toward the discharge side of the chips Z. (By forming a gentle wave shape over the entire circumference, chips can be captured both inside and outside. The shape is effective in both the recovery of the chips Z and the discharge by the injection means 811 and does not damage the mesh. Compared with the example shown in FIG. 3, the example shown in FIGS. 5 (a) and 5 (b) is a continuous U-shaped cross section that has a fan shape that spreads toward the discharge side of the chips Z. Although common, the number of arrangement | positioning of each top part (protrusion part) Dt of an ellipse (U-shaped) is formed in cross section.

Here, according to the present embodiment, the filtration drum 3 has a substantially U-shaped continuous shape (or a continuous elliptical shape) in the rotation axis direction. The chips Z in the filtration drum 3 can be utilized and carried upward with the rotation of the filtration drum 3 and dropped into the transport tray 50b. Further, the substantially U shape has an effect of reducing the surface tension of the coolant liquid while increasing the filtration area with respect to the cylindrical shape, and can increase the filtration ability.
Then, as the substantially U-shaped (or elliptical continuous) filtration filter 3m, several meshes (mesh) are sintered and adhered to form a multilayer structure. For example, if the size of the chips removed by the mesh 3 m of the filtration drum 3 is 10 to 30 μm, it is preferable that the size of the mesh-shaped hole of the central mesh layer 3A is 200 to 600 mesh. The inner mesh layer (inner side of the drum) 3C has a mesh structure of 60 to 30 μm, and the outer side (outer side of the drum) 3B has a mesh of 30 to 60 μm. With such a structure, it is highly accurate for joining wires by sintering, the filtration accuracy of the filtration filter 3m is high, it is sturdy even if it is U-shaped or square-shaped, and chips can be easily discharged. It is suitable for cleaning fine bubbles such as bubbles and nanobubbles.
Here, in patent document 6, although two mesh layers are sintered, it attaches via a frame (frame body 30 of four circumferences), and maintenance of intensity | strength is aimed at only by a mesh layer. It wasn't.
On the other hand, the present invention can be strongly sintered by sintering only three mesh layers, and the upper and lower mesh layers 3B and 3C as reinforcing materials are not only reinforcing the mesh 3A in the center. It also serves as a mesh (FIG. 7B). And even if it carries out the filtration process at 200L / min, about 20 micrometers of chips can be isolate | separated and removed stably. This is because the upper and lower mesh layers 3B and 3C can control the flow rate of the dirty liquid whose mesh-shaped holes are different in size, and it is covered that large-sized chips come into contact with the center mesh 3A. Therefore (which also plays a role as a mesh), high-accuracy filtration with the central mesh 3A is possible. As shown in Table 1, when the central mesh layer 3A is used as a reference for filtering and removing the chips Z, the outer mesh layer 3B and the inner and outer mesh layers 3B are five times larger in size (for example, 20 to 60). Mesh) is preferred. This is to maintain the bonding strength of the sintering and to prevent influence on the standard when the central mesh layer 3A is used as a standard for filtering and removing the chips Z. In the present embodiment, the inner mesh layer 3C is 60 mesh, and the outer mesh layer 3B is 20 mesh. The processing amount (used coolant liquid (dirty liquid) is 200 L / min, and the filtration accuracy of chips (the size of chips to be filtered) is 10 to 30 μm. The type of wire mesh is SUS wire mesh, Copper, etc. may be sufficient.The experiment example (Example) from these points is a combination of a plurality of mesh layers of Table 1. Based on the combination of the mesh layers of Example 3 (400 mesh is a wire diameter) 0.03, the aperture is 0.034, the aperture ratio is 28.2), the mesh-like hole of the central mesh layer 3A is 200 to 600 mesh, and the inner mesh layer 3C is arranged on the inner side. The mesh-like holes of the outer mesh layer 3B arranged on the outside are 5 to 15 times the size of the mesh-like holes of the central mesh layer 3A (about 10 times is the standard) And before The diameter of the wire of the central mesh layer 3A was larger than the thickness of the wires of the inner mesh layer 3C and the outer mesh layer 3B. In addition, the accuracy of filtering by the inner mesh layer 3C and the outer mesh layer 3B is not affected, and on the other hand, the strength of the sintered bond is ensured. 03, the aperture is 0.034, the aperture ratio is 28.2, and the inner mesh 3C is 40 mesh, the wire diameter is 0.25, the aperture is 0.039, and the aperture ratio Is 37.1, the outer side 3B is 60 mesh, the wire diameter is 0.14, the mesh opening is 0.028, and the aperture ratio is 44.4 (conforming to the JIS standard for meshes).
The size of the mesh-shaped holes of the inner mesh layer 3C and the outer mesh layer 3B in Table 1 should be set to the opposite sizes in relation to the direction of passage of the used coolant liquid (dirty liquid) and the injection direction by the injection means. You can also.
FIG. 7 is a photograph of a mesh structure in which a substantially U-shaped protrusion of the filtration drum is copied. FIG. 8 is a particle size distribution diagram of the separated clean liquid filtered by the filtration drum 3. In the examples shown in Table 2, the filtration accuracy of the swarf Z (the size of the swarf to be filtered) is 10 to 30 μm. It can be removed (FIG. 9).
In addition, on the left and right sides of the filtration drum 3, metal outer peripheral covers are attached to the filtration drum 3 at the outer peripheral ends where the substantially U-shaped forward and reverse are repeated. A three-layered mesh structure is formed by the outer peripheral covers covering these left and right end surfaces (FIGS. 3C and 6C). However, there is no cover member other than that, and it is configured only as the filtration drum 3 of the three-layer mesh layers 3A, 3B, 3C.

  In Patent Document 3 (the patent application of the present applicant), the filtration drum 3 has a square shape in the direction of the rotation axis, and therefore, the chips in the filtration drum 3 are removed from the filtration drum 3 using each of the square top portions Dt. Although it was a structure which was easy to carry upward with rotation of 3, it had a surface where it was difficult to remove chips from the filtration drum 3 (FIGS. 7A, 7 </ b> B, and 7 </ b> C). On the other hand, in the present invention, if the chips are easily put into the substantially U-shaped projecting portion and carried upward, and are ejected onto the chips by the injection means 811, the discharge and removal from the substantially U-shaped portion is also easy. is there.

Here, as the ejection means 811, the conventional cleaning method is liquid cleaning using a liquid nozzle, or air blow using air (Patent Document 3 or the like). Moreover, the filtration drum of the Example of patent document 3 equips the outer periphery with the square shape which protrudes at predetermined intervals.
On the other hand, in the continuous ejection from the nozzle 811 of the ejection means 81 of the present invention, the liquid rapidly increases in the liquid ejection speed due to the rapid expansion of the volume of the air, and the impact force of the liquid increases, and the diffusion. The region K1 becomes a wide range. It is preferable that the diffusive injection is performed over a range H1 of the radius of the substantially U-shaped protrusion, and more preferably, it extends to the U-shaped discharge side which is the end-widening side which becomes the discharge side of the chips Z ( For example, it is more preferable that the U-shaped projecting portion Dt and the projecting portion Dt are diffused so as to extend to H2 (FIG. 3A). 4 are arranged continuously above, but the longitudinal direction K1 and K1 in the band shape (widths of H1 and H2) are overlapped within a predetermined range, that is, the nozzle of the injection means 81. It is sprayed laterally from 811 and diffused and sprayed so that the diffusion pattern becomes a band (flat shape) (FIG. 3B). In the invention, the supply of compressed air The spray nozzle (diffusion nozzle) 811 used here has a plurality of fine pores such as a rain dew type, a one having a plurality of linear spray orifices, and a slit orifice. What is sprayed in the form of a film can be used.

  According to the present embodiment, the mesh surface 31 of the filtration drum 3 is periodically dropped while reliably dropping the chips carried upward along with the rotation of the filtration drum 3 from the U-shaped protrusion. Will be washed. Since the cleaning liquid is jetted downward from the outside of the mesh of the filtration drum 3, the cooling load of the coolant cleaning liquid is reduced, and the coolant liquid and chips that efficiently separate and remove the dirty liquid mixed with the chips L3 are efficiently removed. And separation at low cost. For example, in the present invention, as a mixed fluid in which low-pressure compressed air (0.1 to 0.2 MPa) Ar is mixed with coolant liquid (flow rate 15 to 18 liters / min and discharge pressure 0.1 to 0.2 MPa), When continuously ejected from a certain ejection nozzle 811 (when the mixed fluid is ejected from the nozzle under atmospheric pressure), the liquid ejection speed increases rapidly due to the rapid expansion of the volume of the air, and the impact of the liquid As the force increases and the diffusion region becomes wide, foreign matters (chips) adhering to the filtration drum can be efficiently removed.

  As described above, the present invention is not limited to the embodiment described above. In the above-described embodiment, the coil conveyor is exemplified as the rotary filter drum 3, but a screw conveyor may be applied as the rotary filter drum 3. In the above-described embodiment, the spraying means sprays from the outside of the filtration drum, but the position of the spraying means may be outside or inside the filtration drum. Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

1 Chip conveyor device,
3 Filtration drum (rotary drum),
3m mesh (filter)
3A center mesh layer,
3B outer mesh layer,
3C inner mesh layer,
50a Carry tray (pipe),
7 Recovery hopper,
81 coolant liquid supply piping,
811 injection means (injection nozzle),
A9 Coolant liquid (clean liquid for new cleaning)
Dt U-shaped top,
L1 Used liquid (used coolant liquid discharged from machine tools),
L9 clean liquid (clean liquid filtered with a filtration drum),
Mv1 compressed air pump,
W Coolant liquid is in the water storage area,
Z chips,

Claims (5)

  In a filtration drum with a mesh-like hole formed by filtering the used coolant liquid (dirty liquid) discharged from a machine tool such as a lathe or milling machine to remove the clean liquid and discharge the chips. A central mesh layer located on the inner mesh layer, and an inner mesh layer and an outer mesh layer sandwiching the central mesh layer from the inside and the outside. A filtration drum characterized in that an inner mesh layer and an outer mesh layer are formed into larger mesh holes than mesh holes.   The mesh hole of the central mesh layer is a mesh hole serving as a reference for filtering chips of a predetermined size, and the inner mesh layer and the outer mesh layer are different in size of the mesh hole, The filtration drum according to claim 1, wherein one is formed smaller than the other.   The mesh hole of the center mesh layer is 200 to 600 mesh, and the mesh hole of the inner mesh layer disposed on the inside and the mesh hole of the outer mesh layer disposed on the outside are 5 of the center mesh hole. The diameter of the wire of the center mesh layer is smaller than the wire thickness of the inner mesh layer and the outer mesh layer, and is 10-30 μm. The filtration drum according to claim 1 or 2, wherein chips are filtered.   This is a filtration drum that filters out used coolant liquid (dirty liquid) discharged from a machine tool such as a lathe or milling machine to remove clean liquid and discharge chips, and is arranged around the rotating shaft. A mesh-shaped hole is formed by the metal wire, and a substantially U-shaped continuous shape portion is formed on the outer periphery at a predetermined interval in the rotation axis direction of the filtration drum, or a continuous shape of a square shape is formed. The filtration drum according to any one of claims 1 to 3, wherein the filtration drum is provided.   Injecting means for removing chips adhering to the outside or the inside of the filtration drum is provided, and the injecting means removes the chips by injecting a cleaning liquid or air into a coolant cleaning liquid, and the injecting means performs filtration. When the chips are ejected and removed from the inside to the outside of the drum, the mesh-like holes of the outer mesh layer are formed larger than the mesh-like holes of the inner mesh layer, and the ejecting means extends from the inside of the filtration drum to the outside. 4. The mesh hole in the outer mesh layer is formed larger than the mesh hole in the inner mesh layer when the chips are ejected and removed. 5. Filtration drum.