JP2020171988A - Chip conveyor - Google Patents

Abstract

To provide a chip conveyor capable of recovering efficiently cutting fluid containing chips without imposing a load on a filtration drum by large chips.SOLUTION: A conveyor is arranged inside a machine tool K such as a lathe, to thereby improve flow of cutting fluid containing the whole amount of chips, and the first filtration is performed by a through hole 52, when being discharged into a filtration drum 3. The cutting fluid containing the chips passing through the through hole 52 is dropped into the filtration drum 3, and the second filtration is performed in the filtration drum 3. Hereby, no load due to large chips is applied to the filtration drum 3, and efficient recovery becomes possible.SELECTED DRAWING: Figure 1

Description

The present invention relates to a chip transfer conveyor that filters out a clean liquid from a used coolant liquid that is mixed with chips and 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 site where the cutting tool such as a cutting tool or cutter and the workpiece (workpiece) come into contact, and machining is performed while suppressing heat generation at the machining site. The wet type is the mainstream. A chip conveyor device equipped with a filtration means is permanently installed in this wet type machine tool. The chip conveyor device 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 filters the inside of the equipment. It is regenerated into a clean coolant liquid (clean liquid) from which chips have been removed by means and returned to the machine tool. In this specification, metal scraps or scraps containing metal removed from a work by machining of a machine tool are defined as chips, regardless of whether they are whisker-like, curl-like, small-lump-like, powder-like, or sludge-like. It is expressed as chips.

Rotating drum filters, cyclone separators, magnet filters, etc. are examples of filters that are placed on the chip conveyor device and take out the clean liquid from the used coolant liquid (dirty liquid) that is discharged from the machine tool mixed with chips. Be done. The rotary drum filter rotates by rotating a cylindrical rotary drum having mesh-shaped holes formed on its outer circumference with a metal wire (wedge wire) or punching metal around a horizontal axis in a dirty tank containing a dirty liquid. The cutting liquid is filtered inside the rotating drum to make it a clean liquid while keeping chips on the mesh surface on the outer circumference of the drum, and the filtered clean liquid is discharged from the inside of the rotating drum in the horizontal axis direction (horizontal direction) and adjacent to each other. Discharge into a clean tank. The cyclone separator separates the clean liquid by pouring the dirty liquid discharged from the machine tool mixed with chips by applying pressure from the inlet on the side of the housing to generate a spiral flow (cyclone) inside the housing. While discharging the concentrated dirty liquid 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 housing. The magnet filter discharges the clean liquid to the outside of the magnet filter while retaining iron chips on the magnetic body built in the housing. All of these filters separate the clean liquid from a part of the dirty liquid and take it out.

In the chip conveyor device, examples of the transport mechanism for separating and transporting the chips from the used coolant liquid mixed with the chips from the machine tool include a chain conveyor, a coil type conveyor, and a screw type conveyor. In the chain conveyor, a plurality of plate plates for transporting dirty liquid mixed with chips and discharged from a machine tool are continuously arranged and hung between a drive shaft and a driven shaft, and chips are transferred to the plurality of plates. The cutting fluid is passed under the plurality of plate plates while being conveyed on the plate and discharged from the total discharge port above the conveyor. As the chip transfer mechanism of the chain conveyor, in addition to the plate plate, a scraper type conveyor equipped with a scraping member (scraping plate, blade) for scraping chips on a transport belt, a magnet type conveyor equipped with a magnet, and the like. , Coil type conveyors include conveyors with coiled blades attached. The screw type conveyor rotates a screw with a spiral propeller (blade) formed above the rotation axis to compress the chips while transporting them and discharge them from the discharge port above the conveyor while removing the chips. The liquid is moved below the conveyor by gravity. In a coil type conveyor, chips are conveyed by a rotating shaft formed on a spiral coiled blade, compressed and discharged from an outlet above the conveyor, and the cutting fluid from which the chips have been removed is discharged below the conveyor by gravity. It is to be dropped into. In each of these transfer mechanisms, the cutting fluid is dropped below 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 transport path is increased in order to increase the processing capacity of the used liquid mixed with chips and discharged. On the other hand, there are various specifications such as the shape, material, and surface roughness of the work piece (workpiece) processed by the machine tool, and the way chips are generated from the work piece is large depending on the progress stage of machining. Differently, the amount of cutting fluid (coolant) supplied greatly increases or decreases according to the calorific value of the work. That is, the amount of dirty coolant discharged from the machine tool mixed with chips increases and decreases sharply, and the ratio of chips to the dirty coolant also usually fluctuates greatly. In order to cope with the sudden increase and decrease of the amount of dirty coolant discharged, a large-sized conveyor with a margin according to the instantaneous maximum value of the amount of dirty coolant discharged from the machine tool. Or the capacity of the dirty liquid tank to temporarily store the dirty coolant must be large enough, or both must be implemented, either way with a large chip conveyor device according to known methods. There is a concern that it will become.

The rotary drum filter has a drawback that the mesh is easily clogged, but it is suitable for filtering the dirty liquid and taking out the clean liquid. A transport mechanism such as a screw conveyor is suitable for discharging chips as compressed chips while transporting the chips. Therefore, a chip conveyor device in which clogging of the mesh is eliminated by an air injection nozzle or a cleaning liquid injection nozzle after combining these two has been studied (Patent Documents 1 and 2).

Patent Document 1 includes a rotating drum in which a mesh is formed on the outer periphery of a cylindrical shape, a screw type conveyor is arranged coaxially with the rotating drum, and chips are placed on the inner peripheral side of the rotating drum at predetermined intervals in the rotational direction. A device having a configuration in which a rake plate is arranged and a tub communicating with an inflow pipe is arranged below the screw type conveyor is described. In Patent Document 1, the dirty liquid supplied from the inflow pipe escapes from the through hole of the tub, is filtered by the mesh of the rotating drum to become a clean liquid, and is collected in a clean tank arranged below. When the chip rake plate arranged on the inner peripheral side of the rotary drum scoops the accumulated chips and reaches the upper part, the chips fall and are received and transported by the screw type conveyor and discharged. And, on the outside of the rotating drum, either an air injection nozzle or a cleaning liquid injection nozzle is provided, and air or cleaning liquid is injected to clog the mesh of the rotating drum. There is a description that it will be resolved (see the detailed explanation of the idea).

Patent Document 2 includes a rotary drum having a cylindrical outer circumference formed with a mesh, and a scraper type conveyor having a scraping plate attached to a conveyor belt is passed through the rotary drum, and an intermediate plate is formed below the conveyor belt. A device having a configuration in which is arranged is described. In Patent Document 2, the supplied dirty liquid escapes from the through hole of the intermediate plate, is filtered by the mesh of the rotating drum, becomes a clean liquid, is collected in a clean tank arranged below, and is rotated. There is a description that when the chips accumulated on the inner peripheral side of the drum are on the upper side, the chips fall on the intermediate plate, are received by the scraper type conveyor, are transported, and are discharged. It is described that the outside of the rotating drum is provided with either an air injection nozzle or a cleaning liquid injection nozzle, or both, and the clogging of the mesh of the rotating drum is eliminated by injecting air or cleaning liquid (the paragraph). 0017 to paragraph 0020, etc.).
In Patent Document 1, as a coolant purifying device 10 that separates coolant and chips efficiently and at low cost, a first tank 21 that stores coolant and separates chips and coolant remaining in the coolant. Then, the micro-compressed air pump 23 that adsorbs to the chips remaining in the coolant and generates microbubbles for floating the chips on the coolant liquid surface in the first tank 21 and is filtered in the first tank 21. The residual chips are removed from the coolant collected by the first tank recovery device 31 and the first tank recovery device 31 for collecting the residual chips near the coolant liquid level together with the coolant, and are separated from the residual chips. A filter device 41 for returning the coolant to the first tank 21 is provided.
Further, the applicant of the present application has applied for Patent Document 3 (Japanese Unexamined Patent Publication No. 2015-9338), and the content thereof is to eliminate the defect of the cylindrical drum in the chip conveyor device in which the filtration drum and the transport tray are combined. It is a chip conveyor device with a new structure, and it conveys chips while compressing them in a filtration drum 3 that filters dirty liquid by a mesh 3 m arranged around the rotation axis and a transfer tray 5c inserted through the filtration drum 3. A coil conveyor 51 for discharging from a discharge port of a transport path and a driving means 8M for driving these are provided, and the filtration drum 3 has a regular polygonal shape in the direction of the rotation axis, and the dirty liquid supplied into the filtration drum 3 is provided. Is filtered by the mesh 3 m and taken out as a clean liquid, 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. It is conveyed by the conveyor 51, compressed and discharged.

Furthermore, the applicant of the present application has applied for Patent Document 4 (Japanese Unexamined Patent Publication No. 2018-8333), and the content thereof is "a used coolant liquid (dirty liquid containing chips) discharged with chips mixed in). In the filtration drum for filtering the filter, the central mesh layer located in the center and the inner mesh layer and the outer mesh layer sandwiching the central mesh layer inside and outside are sintered, and the central mesh layer has a mesh shape. The inner mesh layer and the outer mesh layer are formed into larger mesh-like holes than the holes. ”The filtration drum.

Japanese Unexamined Patent Publication No. 5-116734 Japanese Unexamined Patent Publication No. 8-283734 Japanese Unexamined Patent Publication No. 2015-9338 Japanese Unexamined Patent Publication No. 2018-8333

In Patent Documents 2 and 3 disclosed by the applicant of the present application, although they are arranged on a milling machine, dirty liquid cannot be discharged from the inside of a machine tool such as a lathe, and the machine tool such as a lathe cannot discharge dirty liquid. There was a problem that it could not be placed in close proximity. Such problems include the mounting position of the drive motor that drives the conveyor and the filtration drum.
Further, in Patent Documents 2 and 3, the used coolant liquid (cutting liquid containing chips) is once dropped from the discharge port of the transport conveyor onto the filtration drum (there is no means for filtering at this position). (Only the opening 53 is formed), which causes the used coolant to drop rapidly, which puts a load on the filtration drum and makes it impossible to efficiently collect chips, and also the filtration drum. It became necessary to replace the filtration filter (mesh) (large chips are also collected by the filtration drum, so that the mesh around the filter is damaged), and the filtration drum is heavily loaded. In addition, the transfer of chips, which are chips, by the transfer conveyor is entirely left to the filtration by the filtration drum.

Therefore, an object of the present invention is to arrange a conveyor inside a machine tool such as a lathe, to improve the flow of cutting fluid containing all the chips, and to clean the cutting fluid containing chips on a filtration drum. An object of the present invention is to provide a chip transfer conveyor that can efficiently collect chips without applying a load due to large chips.

The chip conveyor of the present invention is a chip conveyor that filters a cutting fluid containing used chips discharged from a machine tool such as a lathe or a milling machine to take out a clean liquid and discharges the chips. The conveyor is provided with a conveyor that is arranged from the inside to the outside of the machine tool and a filtration drum having mesh-shaped holes on the outer periphery for collecting and filtering the used coolant liquid from the conveyor. The outer peripheral wall of the machine tool is characterized in that a plurality of through holes for filtering a cutting fluid containing chips and dropping the cutting fluid into a filtration drum and for transporting chips of a predetermined size are formed. Here, the conveyor is arranged from the inside to the outside of the machine tool and is provided so as to penetrate the filtration drum so that the cutting fluid containing the chips is dropped into the filtration drum. Is preferable.
According to the present invention, when the cutting fluid containing chips discharged from a machine tool such as a lathe is collected and conveyed by a conveyor arranged from the inside to the outside of the machine tool, the inside of the filtration drum is conveyed. The first filtration is performed by the through hole, and chips of a predetermined size are conveyed as they are by the conveyor, and fine chips are dropped into the filtration drum together with the cutting fluid. Next, while the filtration drum rotates, filtration (second filtration) is performed by the outer peripheral mesh. Therefore, according to the present invention, the transport conveyor is arranged inside a machine tool such as a lathe, and the flow of the cutting fluid containing all the chips is improved, and the first filtration is performed when the cutting fluid is transferred to the filtration drum. Is performed, the cutting fluid containing the chips that have passed through the through hole is dropped into the filtration drum, and the second filtration is performed in the filtration drum, so that the filtration drum is not loaded with large chips. Efficient collection is possible.

The present invention is characterized in that the diameter of the through hole of the transport conveyor is formed to be larger than the mesh-shaped hole of the filtration drum. The through hole may be formed in an opening / closing plate that can be replaced with respect to the opening.
According to the present invention, the mesh-like holes in the opening allow relatively large chips to be collected by the conveyor without passing through, and smaller chips enter the filtration drum (first). (Next filtration is performed), efficient collection is possible while applying only the load according to the type of chips in the filtration drum.

The present invention is characterized in that a coil-shaped blade for transporting used coolant liquid is attached to the transport conveyor, and chips remaining unfiltered at the position of the through hole are captured and transported.
According to the present invention, a cutting fluid containing chips is sent by the blades of a conveyor, and chips of a predetermined size are dropped into a filtration drum at the position of the through hole, and chips larger than that are dropped. Is carried to the outlet by a blade. For this reason, chips that are too large will not enter the filtration drum and will not put a load such as damaging the mesh of the filtration drum. Therefore, after making it semi-clean, it is filtered by the filtration drum. The Rukoto.

Further, in the present invention, the transport conveyor is provided with an outer peripheral wall for transporting cutting fluid containing used chips to the transport conveyor, and the through hole is formed in the outer peripheral wall from the inside to the outside. It is characterized in that it is formed so that the diameter of the through hole is large.
According to the present invention, chips larger than the through hole are captured (remaining on the conveyor) and sent to the discharge port by the blades of the conveyor, so that the water can be efficiently discharged and filtered. , The cutting fluid can be sufficiently discharged while leaving chips.

According to the present invention, the cutting liquid containing chips discharged from a machine tool such as a lathe is collected and transported by a transport conveyor arranged from the inside to the outside of the machine tool, and sent to the inside of a filtration drum. When this is done, it is dropped into the filtration drum through the opening through which the through hole is formed (first filtration), so that chips of a predetermined size are conveyed as they are on the transfer conveyor, and fine chips are removed from the cutting liquid. At the same time, what has fallen into the filtration drum is filtered (second filtration) by the outer mesh of the filtration drum while rotating. Therefore, the first filtration is performed when the filter is dropped into the filtration drum through the opening through which the through hole is formed, and the second filtration is performed on the filtration drum, so that the filtration drum is loaded with large chips. Efficient collection is possible without.

It is sectional drawing seen from the side which shows the chip conveyor apparatus of 1st Embodiment of this invention. It is a top view of the said 1st Embodiment. It is sectional drawing which was seen from the side which shows the conveyor and the filtration drum of the 1st Embodiment. It is sectional drawing which shows the filtration drum of the said 1st Embodiment. It is a structural drawing which shows the example of the transfer conveyor of the said embodiment. It is a structural drawing which shows the example of the transfer conveyor of the said embodiment. It is a structural drawing which shows the example of the transfer conveyor of the said embodiment. It is a structural drawing which shows another example of the filtration drum of the said embodiment. It is a structural drawing which shows the example of the transfer conveyor of the said embodiment. It is a side view which shows the injection means of each said embodiment. It is a figure explaining the positional relationship between the injection means of the 1st Embodiment and a filtration drum, FIG. 3A is a front view, and FIG. 3B is a side view. It is a figure explaining the substantially U-shaped protrusion part of the filtration drum of the said embodiment. It is a figure explaining the substantially V-shaped protrusion part of the filtration drum of the said embodiment. It is a side view which shows the conventional chip transfer conveyor.

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) in which chips are mixed and discharged from the inside of the machine tool D such as a lathe or a milling machine will be described as a filtration target indicated by reference numeral L1.

(Chip conveyor)
FIG. 1 is a cross-sectional view of the chip conveyor 1 according to the embodiment of the present invention as viewed from the side surface. FIG. 2 is a plan view of the present embodiment. FIG. 3 is an enlarged view of the filtration drum and the conveyor of FIG.
In this embodiment, a chip transport conveyor that filters a used coolant liquid (cutting fluid containing chips) discharged from a machine tool such as a lathe or a milling machine to take out a clean liquid and discharges the chips. The transfer conveyor 50 is arranged from the inside to the outside of the machine tool K, and the filtration drum 3 is arranged outside the machine tool K and collects and filters the used cutting fluid from the transfer conveyor 50. And.
From the machine tool K, the entire amount of the cutting fluid including the chips Z is discharged from the discharge port Kb, is charged from the collection point 50b of the transfer conveyor 50, and is sent into the inside of the transfer conveyor 50 (FIG. 1).

The conveyor 50 penetrates the filtration drum 3, and the penetrating conveyor and the driving means M2 for rotationally driving the filtration drum are attached to the side of the penetrating conveyor 50. The filtration drum is arranged at a close position so as to be laid horizontally outside the machine tool, and is arranged underground together with the storage tank 2B in the machine tool.
The filtration drum 3 filters the dirty liquid L1 by the mesh 3 m arranged around the rotation axis. The mesh of the rotating filter can 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 bonded by sintering (FIG. 7). ). The drum filter 3 m is a rotating drum 3 in which a mesh is formed on the outer periphery thereof by a metal wire (wedge wire), punching metal, etc. The clean cutting fluid is filtered into a clean cutting fluid, and the filtered clean cutting fluid is discharged into the clean tank 2B from the inside of the rotary drum.

In the present embodiment, inside the rotary filtration drum 3, a coil conveyor (coil-shaped blade) 51 is arranged in a predetermined pipeline 50 at substantially the center thereof, and is arranged on the pipeline 50. It is driven by the drive motor M1. When the conveyor 51 is rotationally driven, the chips collected by the collection hopper 7 are discharged while being compressed. Further, a drive shaft J is arranged in a predetermined pipeline (conveyor conveyor) 50 on the back surface side of the coil conveyor 51. In the pipeline 50, the used coolant liquid L1 in which chips are mixed and discharged from a machine tool such as a lathe or a milling machine is collected, drawn into the inside of the filtration drum 3, and stored as a clean liquid in the storage tank 2B. Will be done.
Note that FIG. 14 shows the supply route of the used coolant liquid (dirty liquid) of the conventional device to the filtration drum 3 (reference numerals L1 and F1 in FIG. 14 indicate the route of the used liquid), and the opening. It was only dropped directly from the part 153.

The conveyor 50 penetrates the filtration drum 3, and the penetrating conveyor and the driving means M2 for driving the filtration drum are attached to the side of the penetrating conveyor 50. For this reason, it becomes easy to introduce the conveyor into the machine tool K from the discharge port Kb and arrange it, and the filtration drum 3 can be arranged close to the machine tool K. Therefore, the cutting fluid containing chips discharged from a machine tool such as a lathe is immediately filtered inside the filtration drum 3 outside the conveyor 50 through the through hole 52.
Then, the motor M2 and the filtration drum 3 which are the driving means are driven by a belt drive, a gear drive, a chain drive 42 or the like, and are driven via a bearing or a sprocket 41 arranged outside the conveyor 50, and similarly. The motor M1 which is the driving means of the coil conveyor (coil-shaped blade) 51 and the conveyor 50 are belt-driven, gear-driven, or chain-driven. The rotary coil conveyor 51, which is arranged in the housing 2, transports the chips Z while compressing them in the transport conveyor 50 inserted through the filter drum 3, and discharges them from the discharge port of the transport path 5. The drive means (motors) M1 and M2 for driving these are provided.

The conveyor 50 is provided with an outer peripheral wall 51 for transporting the used coolant liquid, and the through hole 52 is formed in the outer peripheral wall 511 so that the diameter of the through hole 52 increases from the inside to the outside. It is formed (FIGS. 10 (a) and 10 (b)). Therefore, the cutting fluid can be efficiently discharged while leaving chips inside the outer peripheral wall.
The diameter of the through hole 52 is formed to be about 10 mm in the example of FIGS. 5 (a) and 5 (b), and is formed to be about 4 to 10 mm in the example of FIGS. 6 (a) and 6 (b). ing. In the example of FIGS. 6A and 6B, as the through hole 52 of the conveyor 50, the opening 52 is provided on the outer peripheral wall of the conveyor 50, and the closing plate is replaceable with respect to the opening 52. The structure may be such that the 54 is arranged and the through hole 52 is formed in the closing plate 54. Further, as the structure of these through holes 52, a punching metal having a plurality of holes 52 may be bent into a U shape, or a wedge wire may be used (FIGS. 12A and 12B). )). When composed of wedge wires, the cross section is V-shaped, so that clogging is unlikely and the dehydration effect is high.
The through hole 52 is set to have a smaller diameter of the through hole 52 (54a) by attaching a mesh (wire mesh) to the outer peripheral side of the conveyor, attaching a mesh (wire mesh) to the closing plate 54, or the like. You can also do it. That is, by setting the mesh of the filtration drum 3 to be slightly larger than the mesh 3m (Table 3), it is possible to have a correlation with the filtration by the filtration drum 3, for example, the through hole 52 (54a). ) May be set to 5 mm or less, 1/10 mm, and further 1/100 mm to 1/1000 mm (Table 3).
Here, the through hole 52 is provided in a region of half the width H of the filtration drum 3 (FIG. 3). However, the chips Z which are rotated upward by the filtration drum and separated and fall by the injection means 811 are prevented from falling into the region of the through hole 52 by the downwardly inclined inclined plate 7. There is.

Further, a coil blade 51 for transporting the used coolant liquid is attached to the transport conveyor 50, and the through hole 52 is formed within a range in the length direction in which the blade 51 is arranged. Therefore, the through hole 52 can be formed so that the transfer conveyor 50 penetrates the filtration drum 3 and extends over the entire length of the transfer conveyor 50 in the filtration drum 3. That is, in the present embodiment, the position of the through hole 52 is formed by using the central half of the width of the filtration drum 3, but in the conventional apparatus, the entire amount from the machine tool K is discharged. Since it is charged into the filtration drum 3, the load applied to the filtration drum 3 may increase unless a small amount is charged into the drum. However, in the present embodiment, the chips Z are generated by the through hole. Since the first filtration of the containing cutting liquid is performed, the load applied to the filtration drum does not become too large even if it is formed over the entire length of the transport conveyor 50 in the filtration drum 3.

A coolant cleaning liquid supply pipe 81 and an injection nozzle 811 are attached above the filtration drum 3. Water (coolant liquid) A9 to be injected is supplied to the supply pipe 81, compressed air is added by the compressed air pump Mb, and the water (coolant liquid) A9 is supplied to the supply pipe A9 and injected. In the example of FIG. 4, the compressed air is directed directly to the injection means 811 and can be supplied.
The compressed air pump Mv1 of the present embodiment is provided with a supply means for supplying air or gas, is mixed with the coolant liquid from the coolant storage tank, and is injected from the injection nozzle 811. As the compressed air pump Mv1, a pump capable of supplying a small amount of air such as that supplied to a water tank used for breeding tropical fish is sufficiently possible, but a gas-liquid two-phase flow swirling type may be used. The gas-liquid two-phase flow swirling 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 is subdivided into pieces when the vortex is destroyed. The ultrafine bubbles are excellent in the effect of cleaning oils and the like by the power of ions existing on the interface. 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 may go.
In the storage tank 2B, when the coolant liquid containing the compressed air Ar from the injection means 8111 is mixed into the water storage region 2B, ultrafine bubbles such as microbubbles and nanobubbles are generated and the used coolant liquid (dirty) adhering to the chips. It is preferable to separate and remove the liquid). With such a configuration, chips can be washed and discharged by efficiently using one of the injection means. That is, when the coolant liquid containing the compressed air from the injection means is mixed in the water storage region, ultrafine bubbles such as microbubbles and nanobubbles are generated to separate and remove the used coolant liquid (dirty liquid) adhering to the chips. However, the chips thus washed are carried upward and are surely washed and separated by the washing by the injection means and discharged.

In the present embodiment, the cleaning liquid A9 is discharged at a timing when each top of the filtration drum 3 is directly above the conveyor 50, so that the cleaning liquid A9 can be easily dropped into the conveyor 50 at a more accurate position. There is. As for the timing, for example, 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, it is possible to easily detect the predetermined timing.

A coolant liquid supply pipe 81 and a nozzle 811 as an injection means are arranged above the filtration drum 3, and the mesh 3m of the filtration drum 3 is injected downward from the outside. According to the present embodiment. The mesh surface 31 of the filtration drum 3 is periodically cleaned while the chips Z carried upward with the rotation of the filtration drum 3 are surely dropped into the transport conveyor 50. The injection nozzle 811 includes a method in which the cleaning liquid and the compressed air Ar are separately pumped and mixed in the vicinity of the nozzle or in the nozzle 811, and the cleaning water is atomized by the expansion of the gas when the injection nozzle 811 is injected. A structure that injects from an injection nozzle having an orifice of several hundred μm can be adopted.
Then, in the present embodiment, the dirty liquid L1 supplied from the inflow pipe into the filtration drum 3 is filtered by the mesh 3 m to become the clean liquid L9, which is stored in the clean tank, taken out from the discharge pipe 91, and is taken out from the filtration drum 91. The chips in 3 are carried upward with the rotation of the filtration drum 3 and fall into the transport conveyor 50, and are transported by the coil conveyor 51 and discharged to the outside of the machine as compressed chips Z. (Fig. 1, Fig. 2).

12 (a) and 12 (b) are views showing another example of the filtration drum 3 according to the filtration drum 3 of the above embodiment, FIG. 12 (a) is a front view, and FIG. 12 (b) is a side surface. It is a figure. In this example, the filtration drum 3 is provided with a U-shaped protrusion Dt in the direction of the rotation axis, and the filtration area can be increased while increasing the number of arrangements of each top (protrusion) Dt in the filtration drum 3. It will be easy. The U-shape can be fan-shaped, which spreads toward the discharge side of the chips Z (the chips can be captured both inside and outside by forming a gentle wavy shape over the entire circumference. It is possible to collect the chips Z and discharge the chips Z by the injection means 811, and the shape does not damage the mesh. The examples shown in FIGS. 5 (a) and 5 (b) are common in that they have a fan-like shape that spreads toward the discharge side of the chips Z and have a substantially U-shaped continuous cross section, but the cross section is elliptical (U). A large number of arrangements of each top (protruding portion) Dt of the character shape) are formed.
The U-shape is a continuous elliptical shape (approximately U-shape in the forward direction and vice versa), and a fan shape that spreads toward the discharge side of the chips is sprayed when collecting the chips. It is also effective for discharge by means, and has a shape that does not easily damage the mesh. Further, when collecting the chips, the chips adhered in a substantially U shape can be effectively separated and removed by the injection means.

Here, according to the present embodiment, since the filtration drum 3 has a substantially U-shaped continuous shape (or an elliptical continuous shape) in the rotation axis direction, each top Dt of the substantially U-shaped shape is used. By utilizing this, the chips Z in the filtration drum 3 can be carried upward as the filtration 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 liquid while increasing the filtration area as compared with the cylindrical shape, and the filtration capacity can be enhanced.
Then, as the filtration filter 3 m having a substantially U-shaped continuous shape (or an elliptical continuous shape), several meshes are sintered and brought into close contact with each other to form a multilayer structure. For example, assuming that the size of the chips removed by the mesh 3 m of the filtration drum 3 is 10 to 30 μm, the size of the mesh-like holes in the central mesh layer 3A is preferably 200 to 600 mesh. The inner mesh layer (inside the drum) 3C is 60 to 30 mesh, and the outer (outside drum) 3B is 30 to 60 mesh, 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 3 m is high, it is sturdy even if it is U-shaped or square, it is easy to discharge chips, and it is micro. Suitable for cleaning fine bubbles such as bubbles and nanobubbles.
Here, in Patent Document 6, two mesh layers are sintered, but they are attached via a frame body (frame bodies 30 around four), and the strength can be maintained only by the mesh layer. It wasn't.
On the other hand, in the present invention, it is possible to sinter firmly by sintering only three mesh layers, and the upper and lower mesh layers 3B and 3C as reinforcing materials not only reinforce the central mesh 3A. It also serves as a mesh. Then, even if the filtration treatment is performed at 200 L / min, chips of about 20 μm can be stably separated and removed. This covers that the flow rates of the dirty liquids having different mesh-like pore sizes in the upper and lower mesh layers 3B and 3C can be controlled, and that large chips come into contact with the central mesh 3A. Therefore (also serves as a mesh), highly accurate filtration by 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 chips Z, the outer mesh layer 3B and the inner and outer mesh layers 3B are five times or more large (for example, 20 to 60). Mesh) is preferred. This is to maintain the bonding strength of the sintering and to prevent the influence on the standard when the central mesh layer 3A is used as the standard for filtering / removing the chips Z. In the present embodiment, the inner mesh layer 3C has 60 meshes and the outer mesh layer 3B has 20 meshes. 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 or the like may be used. 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 in Example 3 (400 mesh has a wire diameter). 0.03 mm, opening 0.034 mm, opening ratio 27.8%), the mesh-like hole of the central mesh layer 3A is 200 to 600 mesh, and the inner mesh layer arranged inside. The mesh of 3C and the mesh-like hole of the outer mesh layer 3B arranged on the outside are 5 times or more and 15 times or less the size of the mesh-like hole of the central mesh layer 3A (about 10 times as a standard). (It seems), and the thickness of the wire diameter of the central mesh layer 3A is larger than the wire thickness of the inner mesh layer 3C and the outer mesh layer 3B. That is, the difference in the thickness of these wires. As a result, the bonding strength due to sintering is increased, and the accuracy of filtration by the inner mesh layer 3C and the outer mesh layer 3B is not affected. On the other hand, the strength of the sintered bond is ensured. In the case of Example 3, 400 meshes are used. 3A has a wire diameter of 0.03 mm, an 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 opening is 0.25 mm. When the thickness is 0.39 mm, the opening ratio is 36.8%, and the outer 3B is 60 mesh, the wire diameter is 0.14 mm, the opening is 0.28 mm, and the opening ratio is 44.8%. (Compliant with the sieve mesh conversion table based on JIS standards).
The sizes 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 injection direction depending on the passage direction of the used coolant liquid (dirty liquid) and the injection means. You can also.
In each of the examples in Table 2, the filtration accuracy of the chips Z (the size of the chips to be filtered) is 10 to 30 μm, and even if the filtration treatment is performed at 200 L / min, chips of about 20 μm are stably separated. Can be removed.
On both the left and right sides of the filtration drum 3, outer peripheral covers having metal outer peripheral ends in which the substantially U-shaped forward and reverse are repeated are arranged and attached to the filtration drum 3. A three-layered mesh structure is formed by the outer peripheral covers that cover the left and right end faces. However, there is no cover member other than that, and it is composed only as a filtration drum 3 of three-layer mesh layers 3A, 3B, and 3C.

Further, in the present embodiment, as the mesh structure, when the injection means 811 injects and removes chips from the inside to the outside of the filtration drum 3, the mesh layer outside the mesh-like hole of the inside mesh layer. When the injection means 811 injects and removes chips from the outside to the inside of the filtration drum, the mesh holes of the inner mesh layer are formed more than the mesh holes of the outer mesh layer. It can also be a structure that can be formed large.

Further, in the present embodiment, as shown in FIGS. 13A, 13B, and 13C, the filtration drum 3 has a rectangular shape in the rotation axis direction, and the filtration drum is used by using each top Dt of the square shape. It is also possible to have a structure in which the chips in the 3 can be easily carried upward as the filtration drum 3 rotates. The structure is such that chips can be easily put into the substantially U-shaped protrusion, carried upward, and injected into the chips by the injection means 811.

Further, as the injection means 811, the conventional cleaning method is liquid cleaning with a liquid nozzle or air blow with air (Patent Document 3 and the like). Further, the filtration drum of the embodiment of Patent Document 3 is provided with a square shape protruding at predetermined intervals on the outer periphery.

As the injection means 811, it is preferable that compressed air is supplied together with the coolant cleaning liquid, and by using such a mixed fluid, the injection load of the coolant cleaning liquid by the injection means can be reduced (FIG. 10). For example, as a mixed fluid in which low-pressure compressed air (0.1 to 0.2 MPa) is mixed with a coolant liquid (discharge pressure 0.1 to 0.3 MPa at a flow rate of 1 to 4 liters / minute), the injection means When continuously injected from the nozzle of the liquid (when the mixed fluid is injected from the nozzle under atmospheric pressure), the liquid suddenly expands the volume of air, the injection speed of the liquid rapidly increases, and the impact force of the liquid As the diffusion area becomes wider, foreign matter (chips) adhering to the filtration drum can be efficiently removed. The conventional cleaning method is liquid cleaning with a liquid nozzle or air blow with air, whereas the cleaning method of a mixture of two fluids of compressed air and liquid of the present invention is a liquid. The flow rate and pressure are 1/5 to 1/10 or less, and the air flow rate and pressure are 1/10 to 1/20 or less, so that energy consumption can be significantly reduced. It is a cleaning method that can eliminate wasteful resources such as rebound when cleaning liquid and air, and is a cleaning method that enhances the generation of bubbles and enhances the cleaning effect when sprayed onto mesh-shaped holes. That is, in the present invention, the generation of bubbles is dramatically increased due to the correlation between the injection by the injection means and the mesh-shaped holes of the filtration drum, and the cleaning and purification of chips is remarkably improved. Then, by injecting the mesh-shaped hole of the filtration drum 3 downward from the outside thereof, the chips adhering to the filtration filter 3m of the filtration drum 3 are dropped downward, which is the most effective removal. .. Further, the cleaning liquid containing the compressed air of the injection means can be injected downward with the highest impact force and a wide diffusion region. Here, the position of the injection means may be outside or inside the filtration drum. As the compressed air, it is sufficient to mix low-pressure compressed air (0.1 to 0.2 MPa).

According to the present embodiment, the mesh surface 31 of the filtration drum 3 is periodically dropped while the chips carried upward with the rotation of the filtration drum 3 are surely dropped from the U-shaped protrusion. It will be washed. Since the mesh of the filtration drum 3 is sprayed downward from the outside, the load of spraying the coolant cleaning liquid is reduced, and the coolant liquid and the chips that efficiently separate and remove the dirty liquid mixed with the chips L3 are efficiently separated. And separate 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 a coolant liquid (discharge pressure 0.1 to 0.2 Mpa at a flow rate of 1 to 4 liters / minute), the injection means is used. When continuously injected from a certain injection nozzle 811 (when the mixed fluid is injected from the nozzle under atmospheric pressure), the cleaning liquid rapidly increases the injection speed of the liquid due to the rapid expansion of the volume of air, and the impact of the liquid Since the force is increased and the diffusion area is widened, foreign matter (chips) adhering to the filtration drum can be efficiently removed.

As described above, the present invention is not limited to the above-described embodiment. In the above-described embodiment, the coil conveyor is exemplified as the rotary filtration drum 3, but the screw conveyor may be applied as the rotary filtration drum 3. In the above-described embodiment, the injection means is injected from the outside of the filtration drum, but the position of the injection means 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 Tip Conveyor,
2 housing, 2B storage tank,
3 Filtration drum (rotary drum)
3m mesh (second filtration, 3A central mesh layer,
3B outer mesh layer, 3C inner mesh layer,
50 Conveyor (pipeline), 52 through hole (first filtration),
51 coil (blade),
54 Closure Plate, 54a Through Hole (First Filtration),
7 Recovery hopper,
81 Coolant cleaning liquid supply piping,
811 Injection means (injection nozzle),
A9 Coolant cleaning solution (clean solution for new cleaning)
Dt U-shaped top, Ds Ds
L1 Used liquid (coolant liquid discharged from machine tools),
L9 clean liquid (clean liquid filtered by a filtration drum),
Mv1 compression air pump,
Z chips,

Claims (6)

A chip conveyor that filters a cutting fluid containing used chips discharged from a machine tool such as a lathe or a milling machine to take out a clean liquid and discharges the chips. A conveyor is provided from the inside to the outside, and a filtration drum having mesh-shaped holes on the outer periphery for collecting and filtering used coolant liquid from the conveyor, and the outer peripheral wall of the conveyor contains chips. A chip conveyor characterized in that a plurality of through holes are formed for filtering a cutting fluid and dropping it into a filtration drum and for transporting chips of a predetermined size. The conveyor is arranged from the inside to the outside of the machine tool, and is provided so as to penetrate the filtration drum so that the cutting fluid containing the chips is dropped into the filtration drum. The chip transfer conveyor according to claim 1. The first aspect of claim 1, wherein a mesh-shaped hole is formed on the outer periphery of the filtration drum, and the diameter of the through hole of the conveyor is formed to be larger than the mesh-shaped hole of the filtration drum. Chip transfer conveyor. The conveyor is provided with an outer peripheral wall for transporting the used coolant liquid to the conveyor, and the through hole of the opening is formed in the outer peripheral wall so that the diameter of the through hole increases from the inside to the outside. The chip transfer conveyor according to claim 1, wherein the chip transfer conveyor is formed. The transport conveyor is provided with an outer peripheral wall for transporting the used coolant liquid, the opening is provided in the outer peripheral wall, and a replaceable closing plate is arranged with respect to the opening, and the closing plate is provided with a replaceable closing plate. The chip transfer conveyor according to any one of claims 1 to 4, wherein the through hole is formed. A coil-shaped blade that conveys cutting fluid containing used chips is attached to the conveyor, and the conveyor captures and conveys chips that remain unfiltered at the positions of the through holes. The chip transfer conveyor according to any one of claims 1 to 5.