JP6744159B2 - Filtration drum and method of manufacturing filtration drum - Google Patents

Description

The present invention relates to a filter drum and a method for manufacturing a filter drum, which filters out a clean liquid from a used coolant liquid discharged from a machine tool such as a lathe or a milling machine by mixing chips.

In machine tools such as lathes and milling machines, the cutting fluid (coolant fluid) is supplied to the machining area where the cutting tool such as the bite and cutter comes into contact with the workpiece (workpiece), while suppressing heat generation at the machining area. The wet type is the mainstream. In this wet type machine tool, a filter drum provided with a filter means is permanently installed. The filtering drum separates and discharges chips (unnecessary substances removed from the work piece) from the used coolant liquid (dirty liquid) discharged from the machine tool mixed with chips, and also the filtering means in the device. Recycled into a clean coolant liquid (clean liquid) from which chips have been removed by, and returned to the machine tool. In this specification, all metal scraps or metal-containing scraps removed from a work by machining of a machine tool are defined as chips, regardless of mustache-like, curl-like, small-lump-like, powder-like, or sludge-like. It is described as a chip.

Examples of filters that are placed on the chip conveyor device and extract clean liquid from the used coolant liquid (dirty liquid) discharged from the machine tool mixed with chips include rotary drum filters, cyclone separators, and magnet filters. To be The rotating drum filter is a cylindrical rotating drum with a mesh formed on the outer circumference by metal wire (wedge wire), punching metal, etc., and is rotated around a horizontal axis in a dirty tank containing dirty liquid by rotating the outer circumference of the rotating drum filter. While retaining the chips on the mesh surface of the cutting fluid, the cutting fluid is filtered into the inside of the rotating drum to form a clean fluid, and the filtered clean fluid is discharged from the inside of the rotating drum in the horizontal axis direction (lateral direction) to adjoin the clean tank. Discharge inside. The cyclone separator separates the clean liquid by creating a spiral flow (cyclone) inside the housing by injecting the dirty liquid discharged from the machine tool mixed with chips with pressure from the inlet on the side of the housing. While being discharged above the cyclone separator, the concentrated dirty liquid is discharged downward from the separation discharge port (dirty liquid discharge port) at the lower end of the casing. The magnet filter discharges the clean liquid to the outside of the magnet filter while retaining iron chips on the magnetic body built into the housing. Each of these filters separates and takes out the clean liquid from a part of the dirty liquid.

In the chip conveyor device, a chain conveyor, a coil type conveyor, a screw type conveyor and the like are examples of a transport mechanism that separates and transports the chips from the used coolant liquid discharged from the machine tool mixed with the chips. The chain conveyor has a plurality of plate plates that convey the dirty liquid discharged from the machine tool mixed with chips and are continuously placed around the drive shaft and the driven shaft to remove the chips. The cutting fluid is passed under the plurality of plate plates while being conveyed on the plates and discharged from the total discharge port above the conveyor. As a chip conveying mechanism of a chain conveyor, there are a scraper type conveyor having a scraping member (scraping plate) for scraping chips on a conveyor belt, and a magnet type conveyor having a magnet, in addition to a plate plate. The screw type conveyor rotates a screw with a spiral propeller formed above the rotating shaft, compresses the chips while transporting them and discharges them from the discharge port above the conveyor, and the cutting fluid from which the chips have been removed is gravitated. Is to be moved below the conveyor. The coil type conveyor conveys chips by a rotating shaft formed in the shape of a spiral coil, compresses them while discharging them from the discharge port above the conveyor, and the cutting fluid from which chips have been removed to the lower side of the conveyor by gravity. It is something to move. In all of these transport mechanisms, the cutting fluid is moved to the lower side of the conveyor while moving the chips to the discharge port above the conveyor, and the chips are separated and taken out from the dirty liquid.

In the conventional chip conveyor device, the size (area) of the transfer path is increased in order to enhance the processing capacity of the used liquid discharged by mixing chips. On the other hand, there are a wide variety of specifications such as the shape, material, and surface roughness of the workpiece (workpiece) machined by the machine tool, and the way chips are generated from the workpiece is large depending on the processing stage. In contrast, the amount of cutting fluid (coolant) supplied greatly changes depending on the amount of heat generated by the workpiece. In other words, it is customary that the amount of the dirty coolant discharged from the machine tool mixed with the chips drastically increases and decreases, and the ratio of the chips in the dirty coolant also fluctuates greatly. In order to respond to this sudden increase/decrease in the discharge amount of dirty coolant liquid, a large size conveyance path with a margin is prepared according to the instantaneous maximum discharge amount of dirty coolant liquid discharged from the machine tool. Either, or the capacity of the dirty liquid tank for temporarily accumulating the dirty coolant liquid must be made sufficiently large, or both of them must be carried out. In any case, according to the known method, a large filtration drum is used. There is a concern that it will become.

The rotating drum filter has a drawback that the mesh is easily clogged, but is suitable for filtering the dirty liquid to take out the clean liquid. A transport mechanism such as a screw conveyor is suitable for discharging chips as compressed while transporting the chips. For this reason, a filtering drum that combines both of these and eliminates clogging of the mesh by the air injection nozzle and the cleaning liquid injection nozzle. Have been studied (Patent Document 1 and Patent Document 2).

In Patent Document 1, a rotary drum having a mesh formed on the outer periphery of a cylindrical shape is provided, a screw type conveyor is arranged coaxially with the rotary drum, and chips are provided on the inner peripheral side of the rotary drum at predetermined intervals in the rotational direction. An apparatus is described in which a scoop plate is arranged and a trough communicating with an inflow pipe is arranged below the screw type conveyor. In Patent Document 1, the dirty liquid supplied from the inflow pipe exits through the hole in the trough, is filtered by the mesh of the rotary drum, and is collected as a clean liquid in a clean tank arranged below, , The cutting chip rake plate arranged on the inner peripheral side of the rotary drum scoops the accumulated cutting chips, and when the chips become the upper part, the cutting chips fall and are received and conveyed by the screw type conveyor and discharged. And, on the outside of the rotary drum, by providing either an air injection nozzle or a cleaning liquid injection nozzle, or both, to inject air or cleaning liquid to prevent clogging of the mesh of the rotating drum. There is a statement that it will be resolved (see the detailed explanation of the device).

In Patent Document 2, a rotary drum having a mesh-shaped outer periphery of a cylindrical shape is provided, and a scraper type conveyor in which a scraping plate is attached to a conveyor belt is passed through the rotary drum, and an intermediate plate is provided below the conveyor belt. A device having a configuration in which is arranged is described. In Patent Document 2, the supplied dirty liquid passes through the holes of the intermediate plate, is filtered by the mesh of the rotating drum, becomes clean liquid, and is collected in a clean tank arranged below, and the rotating liquid is used. There is a description that when the chips accumulated on the inner peripheral side of the drum become the upper part, the chips fall onto the intermediate plate, are received and conveyed by the scraper type conveyor, and are discharged, and There is a description that, on the outside of the rotating drum, either an air injection nozzle or a cleaning liquid injection nozzle or both are provided to eliminate the clogging of the mesh of the rotating drum by injecting air or cleaning liquid (paragraph thereof). 0017 to paragraph 0020).
In Patent Document 1, as a coolant cleaning device 10 that efficiently separates coolant and chips at 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 that adsorbs to the chips remaining in the coolant and generates micro-bubbles in the first tank 21 to float the chips on the liquid surface of the coolant, and is filtered in the first tank 21. The first tank collecting device 31 that collects the remaining chips near the liquid surface of the coolant together with the coolant, and removes the remaining chips from the coolant collected by the first tank collecting device 31 and separates them from the remaining chips. And a filter device 41 for returning the coolant to the first tank 21.
Further, the applicant of the present application has filed a patent application 3 (JP-A-2005-9338), the content of which is new in a filter drum in which a filter drum and a transport tray are combined and which eliminates the drawbacks of a cylindrical drum. The filter drum 3 having a different structure, and the filter drum 3 that filters the dirty liquid by the mesh 31 arranged around the rotation axis, and the transport tray 50b inserted in the filter drum 3 transports the chips while compressing the chips. The filter drum 3 is provided with a coil conveyor 51 that discharges from the discharge outlet of the passage and a driving means 8M that drives these, and the filtration drum 3 has a regular polygonal shape in the rotation axis direction. A clean liquid is filtered out by the mesh 31 and taken out, and the chips in the filtration drum 3 are carried upward as the filtration drum 3 rotates and fall into the transport tray 51 to fall into the coil conveyor. It is conveyed at 51, compressed and discharged.

Further, Patent Documents 4 and 5 have been disclosed as a device for cleaning ultra-fine bubbles such as micro bubbles and nano bubbles to clean a dirty coolant liquid mixed with chips.
Patent Document 4 efficiently separates coolant and chips at low cost, and this coolant cleaning device 10 stores the coolant and separates chips and coolant remaining in the coolant. A first tank 21, a micro-compressed air pump 23 for generating micro bubbles in the first tank 21 for adsorbing the chips remaining in the coolant and floating the chips on the coolant surface, and the first tank 21. The first tank collecting device 31 that collects the remaining chips near the liquid surface of the coolant filtered in the inside together with the coolant, and removes the remaining chips from the coolant collected by the first tank collecting device 31 and removes 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 capable of effectively removing contaminants (such as organic substances) contained in treated water, and a micro-nano bubble generation unit that generates micro-nano bubbles in the treated water. 43 or a nano bubble generation unit 42 for generating nano bubbles, a second tank 15 for introducing treated water after generation of micro/nano bubbles or nano bubbles, and a treated water introduced into the second tank 15 are provided so as to be contactable with each other. A carrier 16 made of polyvinyl alcohol is provided, and the carrier 16 has pores, and microorganisms are immobilized above the carrier 16.
Further, in Patent Document 6, a filtration filter 20 for filtering solid and liquid from a used contaminated liquid in an industrial machine is provided in an opening 2 formed on an outer peripheral surface of a rotationally driven cylindrical filtration drum. A filter conveyor comprising a filter drum (1) which is detachable from the filter drum (20), wherein the filter (20) is made of metal and is located outside the filter drum. A second plain weave net 16 located inside and having a mesh larger than that of the first plain weave net 15 is sintered and brought into close contact with the second plain weave net 16, and the second plain weave net 16 is composed of the first plain weave. The thing comprised with the member thicker than the net 15 is disclosed. The first plain weave net 15 and the second plain weave net 16 are formed by sintering and closely adhering to each other, and are attached via the frame 30 to form a filter drum.

Japanese Patent Laid-Open No. 5-116734 JP-A-8-283734 JP, 2005-9338, A JP, 2013-163249, A JP, 2009-195887, A JP, 2007-83105, A

In Patent Document 6, two mesh layers are sintered, but they are attached through a frame body (four peripheral frame bodies 30), and the mesh layer alone does not maintain strength. In addition, there is a problem that smaller chips cannot be efficiently separated and removed, or chips enter into the frame (fine chips cannot be stably removed for a long time).
Then, the filter drum needs to pick up the chips or carry them upward and drop them by the injection means. For that purpose, it is necessary to deform the filter drum in various ways (see Patent Document 3). ), even in that case, it is required to efficiently separate and remove smaller chips having sufficient strength. That is, in the filter drum that discharges the chips, an injection unit is provided on the outer side or the inner side of the filter drum to perform air injection or cleaning liquid injection. In addition, backwashing may be performed. For this reason, the filter drum needs to be compatible with these, and in order to capture the chips with the filter on the outer periphery and cause them to circulate, and to blow the chips away by the injection means, it is necessary to have a structure suitable for these structures. There is.
However, the conventional injection means has a problem that a high output is required to increase the injection efficiency and the cost becomes high. Further, the mesh-like hole structure of the filter drum carries it upward, but it causes a situation in which it falls before carrying it upward (directly above).
Further, although the accuracy of the filtration drum is related to the efficient separation and removal of smaller chips, there is a problem that even if a plurality of mesh layers are used, they enter into the plurality of gaps (overlapping gaps).

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

The filtration drum of the present invention is a filtration drum having a mesh-shaped hole for filtering out the used coolant liquid discharged from a machine tool such as a lathe or a milling machine and discharging the clean liquid and discharging the chips. In the three-layer structure, which is a layered structure composed of a metal wire and a wedge wire, including 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 inside and outside . has a filtration drum, formed on both these layers is sandwiched by the wire bonding by sintering, a large mesh-like holes towards the center of the inner mesh layer than meshed hole in the mesh layer and an outer mesh layer It is characterized in that it has a layer structure of only a mesh layer by the sintering of the three-layer structure . Here, the drum filter is preferably a metal wire (wedge wire) or punching metal. The mesh-shaped hole is preferably a metal wire such as stainless steel or copper. According to the present invention, a plurality of layers of the mesh-shaped hole are sintered using a metal wire or the like. A mesh structure in which dirt is not mixed between layers and a predetermined strength is maintained only by the mesh layer without using a frame unlike the conventional case. That is, the inner mesh layer and the outer mesh layer serve as a reinforcing member (member to be sandwiched) to reinforce the central mesh layer by sandwiching it, and also play a role of a filtration filter.

In the present invention, the mesh-shaped hole of the central mesh layer is a mesh-shaped hole that serves as a reference for filtering chips of a predetermined size, and the inner mesh layer and the outer mesh layer have the same mesh-shaped hole size. However, one of them is formed smaller than the other. For example, if the size of the chip be removed by mesh filtration drum tentatively assumed to be 10 to 30 [mu] m, it is preferable to set the size of the mesh-like holes in the center of the mesh layer from the previous SL 200 to 600 mesh.
According to the present invention, the inner mesh layer and the outer mesh layer function as reinforcing members (members to be sandwiched) to reinforce the central mesh layer, and the central mesh layer serves as a filtration filter. Then, for example, when the size of the chip be removed by mesh filtration drum tentatively assumed to be 10 to 30 [mu] m, the size of the mesh-like holes in the middle of the mesh layer has is preferable that said 200-600 mesh ..
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 through. Therefore, for example, when the used coolant liquid (dirty liquid) is passed from the outside to the inside for filtration, the flow rate is controlled when passing through the inner mesh with small mesh-shaped holes from the outside (control in the stop direction). The accuracy of filtration is improved.

In the present invention, the mesh-shaped hole of the central mesh layer is 200 to 600 mesh, and the mesh-shaped hole of the inner mesh layer arranged on the inner side and the mesh-shaped hole of the outer mesh layer arranged on the outer side are in the center. The size is 5 times or more and 15 times or less the size of the mesh holes, and the diameter of the wire of the central mesh layer is smaller than the diameter of the wires of the inner mesh layer and the outer mesh layer. It is characterized by filtering chips of 10 to 30 μm.
According to the present invention, the inner mesh layer and the outer mesh layer also serve as the conventional frame body (see Patent Document 3) also as the mesh-shaped holes, and this serves as the outer mesh layer and the inner mesh layer. When sandwiched with and sintered, it becomes a high-strength filtration filter. As a result of the experiment, when the central mesh layer (mesh-shaped pores were 200 to 600 μm, chips (grains) of 10 to 30 μm could be stably filtered at 90% or more. The filter having the structure has a high filtering accuracy and is strong by being sandwiched, and is compressed and discharged while being sent to the discharge port in the subsequent compression step (conveyance by the rotary conveyor).

According to the present invention, the filtration drum is formed in a continuous U-shape projecting to the outer periphery at a predetermined interval in the rotational axis direction, or in a square shape, and the jetting means corresponds to these projecting positions. It is characterized by being arranged. The U-shape is a continuous elliptical shape with a fan-like shape that widens toward the chip discharge side, which is effective for both chip recovery and ejection by the ejection means, and also damages the mesh. It has a difficult shape.
According to the present invention, due to the three-layer structure of the mesh-like holes, the chips that are sturdy even when bent into a shape such as a rectangular shape or a substantially U-shape, and are attached in the rectangular shape or the U-shaped portion Can be effectively separated and removed, and a structure with high filtration accuracy can be obtained.
In addition, the mesh structure of the filtration drum of the present invention efficiently removes dirt (oil dirt) adhering to the chips by generating bubbles when spraying a coolant cleaning liquid containing compressed air. be able to. That is, the generation of bubbles becomes good, and not only the chip cleaning but also the cleaning effect of the mesh structure itself is exerted.
Further, as the present invention, it is provided with an injection unit for removing chips attached to the outside or the inside of the filtration drum, and the injection unit removes the chips by injecting a coolant cleaning liquid with a cleaning liquid or air. Yes, when the ejecting unit ejects and removes chips from the inside of the filtration drum toward the outside, the mesh-shaped hole of the outer mesh layer is formed larger than the mesh-shaped hole of the inner mesh layer, and the ejection unit is When the chips are jetted and removed from the inner side to the outer side of the filtration drum, the mesh-shaped holes of the outer mesh layer are larger than the mesh-shaped 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 filter drum by the injection of the injection unit.
Further, according to 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 mesh layer in the center and the mesh layers located inside and outside the mesh layer are oriented so as to intersect each other. In this case, the directions of the plain weave net and the twill weave net are crossed, the directions of the plain weave net and the plain weave net are crossed, and the central mesh layer uses a thick metal wire. It is preferable to use thin metal wires so that they are crossed.

According to the present invention, by sintering the three-layer structure described above, the mesh structure is strong, highly effective in cleaning and separating chips, and highly effective in cleaning the mesh structure itself. Instead, the strength is high only with the mesh layer, and even when bending is required, the mesh structure maintains a predetermined strength. Further, by sintering the above three-layer structure, if the smallest mesh-shaped hole on the outer side or the inner side is used as a reference for filtration and removal, chips of that size can be reliably separated and removed. In other words, the bonding strength by sintering is increased and it plays a role as a filter, and the outer and inner mesh layers that sandwich the central mesh layer prevent too large chips from contacting the central mesh layer. 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 chips can be formed in a direction in which they easily fall, the accuracy of separation and removal can be improved.
Further, according to the present invention, when the coolant liquid containing the compressed air from the injection means is mixed in the water storage region, ultra-fine bubbles are generated to separate and remove the used coolant liquid (dirty liquid) attached to the chips. It is possible to provide a filtration drum having a high cleaning effect.

It is a structural diagram which shows the internal structure of the filtration drum of the 1st Embodiment of this invention from a 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 of the above-mentioned embodiment and a filtration drum, Drawing 3 (a) is a front view, and Drawing 3 (b) is a side view. It is a structural diagram which shows the filtration drum of the 2nd Embodiment of this invention. It is a structural diagram showing another example of the filtration drum of the above-mentioned 2nd embodiment. It is a structural diagram showing another example of the filtration drum of the above-mentioned 2nd embodiment. 7 is a photograph of a mesh structure showing a substantially U-shaped protruding portion of the filtration drum of the second embodiment. It is a particle size distribution diagram 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 the present embodiment, the used coolant liquid (dirty liquid) discharged from a machine tool such as a lathe or a milling machine mixed with chips will be described as a filtration target indicated by reference symbol 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 this embodiment from the back side. 3A and 3B are views for explaining the positional relationship between the filtration drum 3 and the ejection means 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 merge.
In the present embodiment, the filtration drum 3 is arranged in the housing 2 and is a rotary type that conveys the chips Z while compressing them in the conveyance tray 50b inserted through the filtration drum 3 and discharges them from the discharge port of the conveyance path 5. The coil conveyor 51 and the driving means (motor) M for driving these. The filtration drum 3 filters the dirty liquid L1 by the mesh 3m arranged around the rotation axis. The mesh of the rotary filter may have a double or triple structure, and in the present embodiment, the mesh has a triple structure in which meshes having different mesh roughness are joined by sintering. The drum filter 3m is a rotary drum having a mesh formed on the outer periphery thereof with a metal wire (wedge wire) or punching metal, and is rotated around a horizontal axis in a dirty tank to remove chips on the mesh surface 3m on the outer periphery of the rotary drum. While retaining, the cutting fluid is filtered into the inside of the rotary drum 3 to make clean cutting fluid, and the filtered clean cutting fluid is discharged from the inside of the rotary drum in the horizontal axis direction (lateral direction) and discharged into the clean tank 2. ..

In the example shown in FIG. 1, inside the rotary filtration drum 3, a coil conveyor 51 is arranged at a substantially central portion in a predetermined pipe line 50b, 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, a drive shaft J is arranged on the back side of the coil conveyor 51 in a predetermined pipeline (conveyance tray) 50b. The pipe line 50b collects the used coolant liquid (dirty liquid) L1 discharged from a machine tool such as a lathe or a milling machine and mixed with chips, and is drawn into the inside of the filtration drum 3 to be below the filtration drum 3. It is discharged to the side and enters the area of the water storage state W. Reference numeral F1 indicates a supply path to the filtration drum 3 of the used coolant liquid (dirty liquid) discharged from a machine tool such as a lathe or a milling machine by mixing chips (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 belt-driven, gear-driven, or chain-driven.

Above the filtration drum 3, a coolant cleaning liquid supply pipe 81 and an injection nozzle 811 are attached. The 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 supplied directly to the jetting means 811.
The compressed air pump Mv1 of the present embodiment includes a supply unit that supplies air or gas, and is injecting the coolant liquid from the coolant storage tank. The compressed air pump Mv1 may be one capable of supplying a small amount of air to be supplied to an aquarium used for raising tropical fish, but a gas-liquid two-phase swirl type may also be used. The gas-liquid two-phase flow swirl type uses a phenomenon in which a water flow is caused to generate a vortex, a gas (a large bubble) is entrained in the vortex, and when the vortex is collapsed, the bubble is fragmented into pieces. The ultrafine bubbles have an excellent effect of cleaning oil and the like by the force of ions existing on the boundary surface. The compressed air pump Mv1 can be replaced with a drain cap having a connection port to attach a drain valve, and a constant flow rate device can be attached using a joint. An actuator is mounted to adjust the air supply as an automatic valve. You can go.

In the present embodiment, the cleaning liquid A9 is discharged for a predetermined time at the timing when each top of the filtration drum 3 is directly above the transport tray 50a, so that the cleaning liquid A9 can be easily dropped into the transport tray 50a at a more accurate position. There is. The 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 near the upper side of the filtration drum 3.

A coolant liquid supply pipe 81 and a nozzle 811 which is an injection unit are arranged above the filtration drum 3 to inject the mesh 3m of the filtration drum 3 downward from the outside, but according to the present embodiment. Thus, the mesh surface 31 of the filtration drum 3 is periodically cleaned while the chips Z carried upward as the filtration drum 3 is rotated are surely dropped into the transport tray 50b. As the jet nozzle 811, a cleaning liquid and compressed air Ar are separately pumped and mixed in the vicinity of the nozzle or at the nozzle 811, and when sprayed, the cleaning water is atomized by expansion of the gas, or compressed cleaning water is It is possible to adopt a structure that ejects from an ejection nozzle having an orifice of several hundreds of μm.
Then, in the present embodiment, the dirty liquid L1 supplied from the inflow pipe into the filtration drum 3 is filtered by the mesh 3m to become the clean liquid L9, which is stored in the clean tank and taken out from the discharge pipe 91, and the filtration drum. The chips in 3 are carried upward as the filtration drum 3 rotates, fall into the transfer tray 50b, and are discharged by the coil conveyor 51 as chips Z compressed and conveyed outside the machine. (Figs. 1 and 2).

FIG. 5: is a figure which shows the other example of the filtration drum 3 which concerns on the filtration drum 3 of the said 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 U-shaped protrusions Dt in the rotation axis direction, and the filtration area is increased while increasing the number of the top portions (protrusions) Dt arranged in the filtration drum 3. It becomes easy to do. The U-shape may be a fan-like shape that spreads toward the discharge side of the chips Z (a gentle corrugated shape is formed over the entire circumference so that chips can be captured inside and outside. In addition, the shape of the chip Z is effective for discharging the chips Z and also for discharging the chips Z, and does not damage the mesh. Compared with the example shown in FIG. 3, the example shown in FIGS. 5(a) and 5(b) has a fan shape that widens toward the discharge side of the chips Z and has a substantially U-shaped cross section. Although common, a large number of elliptical (U-shaped) apexes (projections) Dt are formed in cross section.

Here, according to the present embodiment, since the filtering drum 3 has a substantially U-shaped continuous shape (or a continuous elliptical shape) in the rotation axis direction, each substantially U-shaped top portion Dt is Utilizing this, the chips Z in the filter drum 3 can be carried upward as the filter drum 3 rotates and dropped into the transport tray 50b. Further, the substantially U-shape has an effect of lowering the surface tension of the coolant while increasing the filtration area as compared with the cylindrical shape, and can enhance the filtration capacity.
Then, as the substantially U-shaped continuous shape (or elliptical continuous) filtration filter 3m, several meshes are sintered and adhered to each other to form a multilayer structure. For example, if the size of the chips to be removed by the mesh 3m of the filtration drum 3 is 10 to 30 μm, it is preferable that the size of the mesh-shaped holes in the central mesh layer 3A be 200 to 600 mesh. The inner mesh layer (inner side of the drum) 3C has a mesh structure of 60 to 30 mesh, and the outer side (outer side of the drum) 3B has a mesh structure of 30 to 60, which is a mesh structure obtained by sintering a three-tank structure. 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 are easily discharged, It is suitable for cleaning fine bubbles such as bubbles and nano bubbles.
Here, in Patent Document 6, two mesh layers are sintered, but the two mesh layers are attached via a frame body (frame body 30 around the four periphery), and the strength can be maintained only by the mesh layers. Was not.
On the other hand, according to the present invention, it is possible to strongly sinter by only sintering the three mesh layers, and the upper and lower mesh layers 3B and 3C as the reinforcing material not only reinforce the central mesh 3A, It also serves as a mesh (Fig. 7(b)). Then, even if the filtration process is performed at 200 L/min, chips of about 20 μm can be stably separated and removed. This is because it is possible to control the flow rates of the dirty liquids having different sizes of the mesh-shaped holes in the upper and lower mesh layers 3B and 3C and that large chips contact the central mesh 3A. Therefore (also plays a role as a mesh), highly accurate filtration is possible by the central mesh 3A. As shown in Table 1, when the center 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 have a size five times or more (for example, 20 to 60). Mesh) is preferred. This is for maintaining the bond strength of sintering and for not affecting the standard when the central mesh layer 3A is used as the 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. Processing amount (used coolant liquid (dirty liquid) is 200 L/min, filtration accuracy of chips (size of chips to be filtered) is 10 to 30 μm. Kind of wire mesh is SUS wire mesh, It may be copper, etc. From these points, the experimental example (Example) is a combination of a plurality of mesh layers in Table 1. Based on the combination of the mesh layers of Example 3 (400 mesh is a wire diameter 0.03 mm, opening is 0.034 mm, opening ratio is 27.8%), the mesh-shaped hole of the central mesh layer 3A is 200 to 600 mesh, and the inner mesh layer arranged inside The mesh 3C and the mesh-shaped holes of the outer mesh layer 3B arranged outside are 5 times or more and 15 times or less as large as the mesh-shaped holes of the central mesh layer 3A (about 10 times is the standard. And the diameter of the wire of the central mesh layer 3A is thicker than that of the inner mesh layer 3C and the outer mesh layer 3B. As a result, the bonding strength due to sintering is increased, the accuracy of filtration by the inner mesh layer 3C and the outer mesh layer 3B is not affected, and on the other hand, the strength of the sinter bond is ensured. 3A has a wire diameter of 0.03 mm, a mesh opening of 0.034 mm, an opening ratio of 27.8%, and when the inner mesh 3C is 40 mesh, the wire diameter is 0.25 mm and the mesh opening is When the outside 3B is 60 mesh, the wire diameter is 0.14 mm, the opening is 0.28 mm, and the opening ratio is 44.8%. (Complies with the sieve mesh conversion table based on JIS standards).
The sizes of the mesh-like 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 passing direction of the used coolant liquid (dirty liquid) and the jetting direction by the jetting means. Can also
Further, FIG. 7 is a photograph of a mesh structure in which a substantially U-shaped protruding portion of the filtration drum is shown. FIG. 8 is a particle size distribution chart of the separated clean liquid filtered by the filtration drum 3. In each of the examples of Table 2, the filtering accuracy of the chips Z (the size of the chips to be filtered) is 10 to 30 μm, and even if the filtration process is performed at 200 L/min, chips of about 20 μm are stably separated. It can be removed (Fig. 9).
On the left and right sides of the filtration drum 3, outer circumferential ends made of metal are arranged and attached to the filtration drum 3 at the outer circumferential ends of which the U-shape repeats forward and backward. The outer peripheral covers covering the left and right end surfaces form a three-layered mesh structure (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, and 3C.

In Patent Document 3 (patent application of the applicant of the present application), since the filtration drum 3 has a square shape in the rotation axis direction, the chips in the filtration drum 3 are filtered using the respective apex portions Dt of the square shape. Although the structure was such that it could be easily carried upward as the 3 rotates, it had a surface where it was difficult to remove the chips from the filtration drum 3 (Figs. 7(a)(b)(c)). On the other hand, in the present invention, when the chips are easily inserted into the substantially U-shaped protruding portion and carried upward and the chips are sprayed by the spraying means 811, the chips can be easily discharged and removed from the substantially U-shaped portion. is there.

Here, as the ejecting means 811, the cleaning method up to now is liquid cleaning with a liquid nozzle or air blowing with air (Patent Document 3, etc.). Further, the filtration drum of the embodiment of Patent Document 3 is provided with angular shapes projecting at predetermined intervals on the outer circumference.
On the other hand, in the case where the liquid is continuously ejected from the nozzle 811 of the ejection means 81 of the present invention, the liquid is rapidly expanded due to the rapid expansion of the volume of the air, and the impact force of the liquid is increased and the liquid is diffused. The area K1 becomes wide. It is preferable to diffuse and inject over a range H1 of the radius of the substantially U-shaped protruding portion, and more preferably, it is widely spread to the U-shaped discharge side of the diverging end which is the discharge side of the chips Z ( For example, it is more preferable that the U-shaped protrusion Dt is diffused so as to reach the distance H2 between the protrusions Dt (FIG. 3A), and the nozzle 811 of the jetting means 81 of the invention of the present application is the filtration drum 3. 4 of them are arranged continuously above, but the diffusion angles are arranged so that the longitudinal directions K1 and K1 in the form of strips (widths of symbols H1 and H2) overlap in a predetermined range. 811 is sprayed laterally to diffuse and spray so that the diffusion pattern becomes a strip shape (flat shape) (FIG. 3B).For such diffusion, it is necessary to increase the pressure of the cleaning liquid. In the present invention, this is achieved by supplying compressed air.As the injection nozzle (diffusion nozzle) 811 used here, one having a plurality of fine pores such as a rain dew type or a plurality of linear spray orifices is used. It is possible to use those which have or those which are ejected in a film form from the orifice of the slit.

According to the present embodiment, the chips carried upward with the rotation of the filtration drum 3 are surely dropped from the U-shaped protrusions, and the mesh surface 31 of the filtration drum 3 is cyclically moved. It will be washed. Since the mesh of the filter drum 3 is sprayed downward from the outside with the cleaning liquid, the spraying 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 separate at low cost. For example, in the present invention, as a mixed fluid in which a low pressure compressed air (0.1 to 0.2 MPa) Ar is mixed with a coolant liquid (flow rate 15 to 18 liters/discharge pressure 0.1 to 0.2 MPa), the injection means When continuously ejected from a certain ejection nozzle 811 (when the mixed fluid is ejected from the nozzle under the atmospheric pressure), the cleaning liquid rapidly increases in ejection speed of the liquid due to the rapid expansion of the volume of the air, and the impact of the liquid. As the force increases and the diffusion area becomes wider, foreign matter (chips) adhering to the filtration drum can be efficiently removed.

As described above, the present invention is not limited to the above embodiment. Although the coil conveyor is illustrated as the rotary filtration drum 3 in the above embodiment, a screw conveyor may be applied as the rotary filtration drum 3. In the above-described embodiment, the injection unit injects from the outside of the filtration drum, but the position of the injection unit may be outside or inside the filtration drum. As described above, it goes without saying that the present invention can be appropriately modified without departing from the spirit of the present invention.

1 Chip conveyor device,
3 filtration drum (rotary drum),
3m mesh (filter)
3A central mesh layer,
3B outer mesh layer,
3C inner mesh layer,
50a Carry tray (pipe line),
7 Recovery hopper,
81 Coolant liquid supply pipe,
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 the machine tool),
L9 clean liquid (clean liquid filtered by a filtration drum),
Mv1 compressed air pump,
W coolant is the water storage area,
Z chips,

Claims (4)

Metal wire or wedge wire is used in filtration drums that have a mesh-shaped hole that filters out the used coolant liquid discharged from machine tools such as lathes and milling machines and discharges the clean liquid and discharges the chips. It is a layered structure consisting of a central mesh layer located in the center, and a three-layered filtration drum having an inner mesh layer and an outer mesh layer sandwiching the central mesh layer from the inside and the outside , both these layers are sandwiched by the wire bonding by sintering, towards the center of the inner mesh layer than meshed hole in the mesh layer and an outer mesh layer is formed on a large mesh-like hole, the three-layer A filtration drum characterized by having a layer structure of only a mesh layer by sintering the structure . The mesh-shaped hole of the central mesh layer is a mesh-shaped hole that serves as a reference for filtering chips having a predetermined size, and the center mesh layer that serves as a reference for filtering the chips has a grain size before sintering. A mesh having an opening of 200 to 600 mesh is used, and the size of the mesh hole in the center is defined by the sintering, so that the mesh of the inner mesh layer arranged inside and the mesh hole of the outer mesh layer arranged outside are formed. The diameter of the wire in the central mesh layer is smaller than the thickness of the wires in the inner mesh layer and the outer mesh layer. The filter drum according to claim 1, wherein In the method of manufacturing a filter drum with a mesh-shaped hole that filters out used coolant liquid discharged from machine tools such as lathes and milling machines and discharges the clean coolant and discharges the chips , A central mesh layer located, and an inner mesh layer and an outer mesh layer sandwiching the central mesh layer from inside and outside, these layers are sandwiched by sintering, and the mesh of the central mesh layer The method for producing a filtration drum is characterized in that the inner mesh layer and the outer mesh layer are formed into mesh-shaped holes that are larger than the mesh-shaped holes, and are sintered as a layer structure of only the mesh layer of the three-layer structure. In the method of manufacturing a filter drum with a mesh-shaped hole that filters out used coolant liquid discharged from machine tools such as lathes and milling machines and discharges the clean coolant and discharges the chips, A central mesh layer located, 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 provided and sandwiched by sintering, and the rotary shaft of the filtration drum A method for manufacturing a filtration drum, characterized in that a bent portion having a substantially U-shaped continuous shape, a rectangular continuous shape, or the like is provided on the outer periphery at predetermined intervals in the direction, and sintering is performed .