JP4665142B2 - Coolant filtration element in chip discharge conveyor - Google Patents

Description

  The present invention relates to a coolant filtering element of a chip discharge conveyor that is attached to a machine tool and used for the purpose of automatically discharging chips from a machine tool such as a lathe or a milling machine.

  In a machine tool such as a lathe or a milling machine, a wet type that performs high-speed machining while supplying and cooling a coolant to a machining position where a tool or a cutter comes into contact with a workpiece is mainly used. In a wet machine tool, the swarf mixed with the coolant is discharged as a by-product, and how to treat the swarf becomes a problem. With regard to this problem, coolant is required to be circulated for as long as possible from the viewpoints of reducing operating costs and environmental conservation, and chips are continuously used without stopping the machine tool from the viewpoint of improving processing efficiency. It is required to discharge outside the machine.

  The chip discharge conveyor is widely used as a device that satisfies the requirements from this point of view, that is, a device that has both a filtration function for separating chips and coolant and a chip discharge function for continuously discharging separated chips. ing. The filtering function in the chip discharging conveyor is shared by a coolant filtering element which is formed in a drum shape and used while being rotated, and the chip discharging function is executed by a special conveyor chain of a scraper type or a hinge plate type. Since the chips contained in the coolant cause a reduction in processing accuracy when reused for cutting processing, etc., the coolant filtering element is required to have a sufficiently high filtering capacity, and during operation, metal Since it is always in contact with sharp cutting chips made of metal, it must be robust enough to withstand long-term use.

Japanese Patent Publication No. 2-44564 Japanese Patent No. 2888774 Japanese Utility Model Publication No. 62-25209 Japanese Utility Model Publication 4-33929

  Although patent document 1 does not explain the material of the filter, it is suggested that the filter stretched around the body of the filtration drum is easily damaged by chips.

  Patent Document 2 discloses a cylindrical filter constituted by eight filter elements whose surroundings can be individually replaced. The object and effect of the present invention are as described in the same document, but the description of the filter element is omitted because it is not an invention of the filter element. However, this filter element will be described because it is obvious to the applicant. The filter element is made of, for example, nylon or other high-strength resin having a wire diameter of 120 μm, a mesh size of 200 μm, and an 80 mesh configuration. The reason why the resin strands are used is that consideration is given to the realization of mesh values exceeding the limit of metal mesh and durability in that case. If the filter element is damaged, only the damaged filter element can be replaced.

  Patent Literature 3 discloses a filter net cylinder using a mesh filter net. The material of the mesh is not touched. However, the metal chip separation device using the filter net cylinder is a structure that receives the chips discharged from the machine tool inside the filter net cylinder, and therefore the mesh needs to be made of a material that can withstand weight. Presumed to be a metal mesh.

  Patent Document 4 discloses a mesh filter device using a cylindrical mesh filter in which a large number of pores are formed in a thin metal sheet. In the present invention, it is expressed as a mesh filter 20 but is essentially a so-called punching metal filter.

  As shown in the above patent document, conventionally, any one of a metal mesh, a resin mesh, and a punching metal is used as a coolant filtering element in a chip discharge conveyor.

  Among these, the metal mesh has a problem that the mesh numerical value cannot be set large. In order to increase the mesh numerical value, it is necessary to use a thin metal wire to be used, and a mesh using a fine wire exceeding a certain limit is easily deformed or disconnected by an external force. In addition, the resin mesh can easily achieve a high mesh numerical value and has the advantage that it is resistant to deformation due to the elastic recovery force unique to the material, but it has the problem that it is easily broken by contact with sharp chips. It is difficult to apply to machine tools that generate sharp chips. For punching metal, the thickness of the metal plate that is the material, the size of the punch holes that can be drilled in the metal plate of that thickness, and the distance between adjacent punch holes, there are manufacturing limitations, It has the problem that it is difficult to obtain a product with high filtration capacity.

  Therefore, an object of the present invention is to solve the problem that it is difficult to achieve both filtration capability and robustness in a coolant filtration element in a conventional chip discharge conveyor.

The coolant filtering element in the chip discharge conveyor according to claim 1 of the present invention is formed by tightly winding a single continuous element element wire in a coil shape around a frame of a frame structure in which a cylindrical element is assembled, Unwinding prevention processing is applied to at least the start and end of the element wire, and the element wire is disposed with a uniform pitch interval in the longitudinal direction, and has a uniform protruding height in the same direction. A number of protruding notches are integrally formed, and the element strands that are wound around the winding frame in a coil shape and are adjacent to each other in the axial direction of the winding frame are brought into close contact with each other through the notches, whereby a large number of filter holes are formed. There are formed, the winding frame of the element wires are at equal angular intervals on the outer circumference of the ring frame towards a plurality of ring frames arranged with a predetermined interval in the axial direction of the spool It is composed of a plurality of support rods that interconnect a plurality of ring frames, and the support rods are catenary inward between the plurality of ring frames by the winding tension of the element wire wound around the outside of the support rods. It is characterized by elastic deformation .

  The single element wire wound tightly around the winding frame forms a cylindrical element surface that follows the shape of the winding frame as a whole of the coiled element wires. At this time, the element wires adjacent in the axial direction of the winding frame are in close contact with each other through the notches. Therefore, a gap equal to the protruding height of the notch is generated between adjacent element wires regardless of the cross-sectional area of the element wires. In addition, as a result of the notches in the element strands being formed at an equal pitch interval, the gap generated between the element strands is partitioned for each notch pitch interval. That is, the cylindrical element surface formed by the coiled element wires has a large number of filtration holes whose size can be freely set by adjusting the pitch interval of the notches and the protruding height of the notches. Is formed. And the whole intensity | strength of an element surface can be freely set by changing the cross-sectional area of an element strand.

  As an element wire of the coolant filtering element in the chip discharge conveyor, an element wire made of engineering plastic can be used in addition to a metal element wire. Depending on the unique characteristics of the metal material and engineering plastic material, for example, when using metal element wires, it is possible to form an element surface that is resistant to scratching at low cost. In addition, when an element wire made of engineering plastic is used, a lightweight element surface excellent in chemical resistance and elastic recovery force can be formed.

  A large number of support rods are arranged in a circle on the outer periphery of the ring frame, and the element wire is wound around the outside of the support columns. Therefore, the length of the element wire necessary for making one round of the outer periphery of the many support rods is shorter than that when the support rods are not elastically deformed due to the support rods elastically deforming inward. As a result, if the support rod is initially deformed inward, the support rod is elastically recovered when the element wire is thermally expanded, and the winding slack of the element wire can be absorbed.

  The coolant filtration element in the chip discharge conveyor of the present invention is composed of element strands in which the element surface is wound in a coil shape, and the robustness required for the element surface can be freely set by adjusting the cross-sectional area of the element strand. The size of the filtering hole that determines the filtering capacity can be freely adjusted according to the pitch interval of the notches of the element strands and the protruding height of the notches that can be determined independently of the cross-sectional area of the element strands. Therefore, it is possible to achieve both the filtering ability and the robustness, which are conventionally contradictory requirements.

  The coolant filtration element 100 in the chip discharge conveyor includes an element surface 10 constituted by a single continuous element wire 11, a frame structure reel 20 assembled in a cylindrical shape for winding the element wire 11, and a winding. It consists of a pair of flange plates 30 and 30 attached to the end surface of the frame 20 (FIG. 1), and the element surface 10 is constituted by a single element wire 11.

  The element wire 11 is a single metal wire having a flat cross section, and by being flat, the element wire 11 has directionality by distinguishing between the width direction K1 and the thickness direction K2 (FIGS. 2 and 3). . A large number of notches 11 </ b> A are integrally formed on one surface side of the flat surface with an equal pitch interval P <b> 1 over the entire length of the element wire 11. The notch 11A has a substantially trapezoidal cross section and is formed so as to cross the element strand 11 in the width direction K1 of the element strand 11A. The protruding height H1 of the adjacent notch 11A is an element that affects the filtering ability of the element surface 10 constituted by the element strands 11, and the cross-sectional area 11B of the element strand 11 increases the robustness of the element surface 10. It is set according to the aspect of the cutting powder of the machine tool combined with the chip discharge conveyor as an influential element.

  As the element wire 11, it is preferable to use rust-resistant materials such as SUS304 stainless steel wire, monel metal wire, titanium wire, etc. These metal materials are resistant to rusting, and are also tenacious and highly resistant to acid, respectively. Properties specific to metal species such as a low rate can be exhibited.

  Since the winding frame 20 is formed in a cylindrical shape, the axial direction K3 and the radial direction K4 can be distinguished (FIG. 1). The winding frame 20 includes a plurality of ring frames 21 and 22 distributed in the axial direction 3 in a posture along the radial direction K4, and a number of support rods attached to the outer periphery of the ring frames 21 and 22 toward the axial direction K3. 23.

  Each of the plurality of ring frames 21 and 22 is a disk-shaped body formed in an annular shape, and the pair of ring frames 21 arranged on the end surface portion of the winding frame 20 are formed in steps (FIG. 4). ). The support rods 23 are set to an equal angular interval θ1.

  The winding frame 20 is assembled by positioning the intermediate position of the support rod 23 on the outer peripheral portion of the ring frame 22 at the intermediate position and fixing the end of the support rod 23 to the step portion of the ring frame 21 (FIG. 1). , FIG. 5). The support rod 23 in the winding frame 20 of this embodiment has the outer periphery of the ring frame 22 set at an equal angular interval θ1.

  The element wire 11 is tightly wound around the reel 20 that has been assembled, whereby a cylindrical element surface 10 is formed on the outer periphery of the reel 20 (FIGS. 1 and 6). At this time, the element strand 11 has its width direction K1 directed to the radial direction K4 of the winding frame 20, and the protruding direction of the notch 11A is directed to the axial direction K3 of the winding frame 20 by a predetermined winding tension. Wrapped around. Therefore, the element wire 11 has a laminated structure in which the element wire 11 is stacked in a coil shape in the axial direction K3 of the winding frame 20 via the notch 11A as a whole, and the winding frame 20 is tightened by the total force of the winding tension of the element strand 11. Note that an unwinding preventing process is performed on at least the start and end of the element wire 11.

As a result, innumerable filtration holes 10H having a size equal to the protruding height H1 of the notch 11A divided at every pitch interval P1 of the notch 11A are formed in the element surface 10 (FIG. 6). The size of the filtration hole 10H is restricted only by the pitch interval P1 and the protrusion height H1 of the notch 11A, and is not restricted by the cross-sectional area of the element wire 11. The aperture ratio, which is the ratio between the total area of the element surface 10 and the total area of the filtration hole 10H, can be realized by setting the protrusion height H1 of the notch 11A high, and the thickness of the element wire 11 This can also be realized by setting the dimension in the direction K2 small. This aperture ratio is a numerical value that serves as an index representing the coolant processing capacity per unit time, separately from the filtration capacity, and is preferably set as large as possible.

  Further, the support rod 23 of the winding frame 20 fastened to the element wire 11 is elastically deformed in a catenary shape inward between the plurality of ring frames 22 and 22 (FIG. 7). However, this figure is an explanatory view schematically showing this state in an exaggerated manner, and the deformation of the support rod 23 is suppressed to such an extent that it is actually difficult to observe visually. However, the flexibility imparted intentionally to the reel 20 is an important contrivance for maintaining the element wire 11 having a long total extension without slack. The effective diameter D2 of the winding frame 20 determined by the diameter of the ring frame 22 and the diameter D1 of the support rod 23 is reduced at an intermediate position of the winding frame 20, and when the element wire 11 is linearly expanded due to a rise in coolant temperature. In this case, the effective diameter D2 is increased and the elongation of the element wire 11 is absorbed by the support rod 23 returning to the linear shape. Note that the flexibility of the winding frame 20 can be easily adjusted by changing the frame interval S3 or the diameter of the support rod 23 by D1.

  The coolant filtering element 100 is required in relation to the type of the chip discharge conveyor 50 to be combined with the ring frame 21 on the end face side of the winding frame 20 in which the winding operation of the element wire 11 has been completed. For example, the flange plate 30 provided with the rotating shaft 31 having a hollow structure and the sprocket wheel 32 for rotational driving is attached and used (FIG. 1).

  An example in which the coolant filtering element 100 is incorporated into the chip discharge conveyor 50 will be described (FIGS. 8 and 9). The illustrated chip discharge conveyor 50 includes a filtration tank 51 and a storage tank 55 provided along with the filtration tank 51, and a lift duct 52 and a discharge duct 53 are integrally connected to the filtration tank 51. In the filtration tank 51, the chips and the coolant are separated, and the storage tank 55 is a tank for storing the coolant from which the chips are removed.

  The upper surface of the filtration tank 51 is provided with an inlet 51H for feeding chips, and a conveyor belt 56 that is circulated and driven from the end of the filtration tank 51 to the upper end of the lift duct 52 is provided inside the filtration tank 51. is set up. The conveyor belt 56 is driven by a drive motor 59 disposed on the side surface of the upper end portion of the lift duct 52. The conveyor belt 56 used for the chip discharge conveyor 50 includes a caterpillar type called a hinge plate type and a scraper type called a scraper type. The scraper type is used here. . The scraper type conveyor belt 56 has a structure in which a large number of scrapers are horizontally provided between a pair of parallel running chains 56T, 56T. It is driven to move in the direction of.

  The coolant filtration element 100 is installed in a direction crossing the filtration tank 51 of the chip discharge conveyor 50. A chain 56T of a conveyor belt 56 is hung on the sprocket wheel 32 provided on the flange plate 30 of the coolant filtering element 100, and the coolant filtering element 100 is rotationally driven by using a drive motor 59 in common. Inside the coolant filtering element 100, a plurality of cleaning nozzles 57N directed toward the lift duct 52 are installed, and coolant that has been filtered by the circulation pump 57 installed in the storage tank 55 is supplied to the cleaning nozzles 57N. It has become so. In addition, as many coolant pumps 58 as necessary can be installed in the storage tank 55, and the filtered coolant can be sent back to the machine tool.

  In the chip discharge conveyor 50 using the scraper type conveyor belt 56, the chips introduced from the inlet 51 </ b> H settle on the bottom surface of the filtration tank 51. The settled chips are pushed by the scraper of the conveyor belt 56 and conveyed toward the lift duct 52 along the bottom surface. Next, the chips rise in the lift duct 52 so as to be placed on the scraper rising along the lift duct 52, and the coolant falls during the raising operation of the scraper and flows back into the filter tank 51. The chips separated from the coolant are discharged from the upper end of the lift duct 52 through the discharge duct 53.

In the filtration tank 51, the coolant filtration proceeds by the coolant filtration element 100 simultaneously with the discharge operation of the chips. The coolant in the filtration tank 51 enters the coolant filtration element 100 through the filtration hole 10H of the element surface 10, and is separately provided with the hollow shaft 31 provided on the flange plate 30 on the storage tank 55 side of the coolant filtration element 100 or separately. A path that passes through a dedicated overflow hole provided in the storage tank 55 and reaches the storage tank 55 is followed. A part of the filtered coolant is pumped by the circulation pump 57 and sprayed from the cleaning nozzle 57N in the coolant filtering element 100, and is used to wash off the chips adhering to the element surface 10, and most of the remaining coolant is used. The coolant is delivered to the machine tool side by a coolant pump 58. That is, the coolant level in the storage tank 55 is constantly reduced, and the filtered tank 51 is replenished with constantly filtered coolant to the storage tank 55 side by the drop in the liquid level. In such a usage pattern, the coolant filtering element of the present invention can exhibit semi-permanent durability as well as a filtering capability that can be freely set.

  An engineering plastic can be used for the element wire 11 for forming the element surface 10 of the coolant filtering element 100. As the plastic material, a material having a low coefficient of thermal expansion, high cutting strength, wear resistance and self-lubricating property is preferable. For example, nylon or delrin is a plastic material that satisfies such requirements.

It is a side view which fractures | ruptures and shows the coolant filtration element of one embodiment of this invention in steps. It is a perspective view of the element strand of the said one Embodiment. It is a side view of the element strand of the one embodiment. It is a cross-sectional view of the winding frame of the one embodiment. It is an expanded sectional view of the important section of the winding frame of the above-mentioned one embodiment. It is the elements on larger scale of the element surface of the said one Embodiment. It is operation | movement explanatory drawing of the reel of the said one Embodiment. It is a top view which shows the usage example of the coolant filtration element of the said one Embodiment. It is a side view which shows the usage example of the coolant filtration element of the said one Embodiment.

Explanation of symbols

100 Coolant filtration element P1 Pitch interval H1 Projection height K3 Axial direction θ1 Angular interval 10 Element surface 11 Element strand 11A Notch 20 Winding frame 21 Ring frame 22 Ring frame 23 Strut bar

Claims (2)

A single continuous element element wire is tightly wound in a coil shape on a frame of a frame structure assembled in a cylindrical shape to form an element surface, and at least the start and end of the element element wire are subjected to an unwinding prevention treatment. The element strands are integrally formed with a large number of notches that are arranged at equal pitch intervals in the longitudinal direction and project at the same projecting height in the same direction. element wires which are adjacent in the axial direction of the spool wound in a coil shape is close to through the notch, thereby has a number of filter holes are formed, the winding frame of the element wire a predetermined distance A plurality of ring frames arranged while maintaining a plurality of pillars arranged at equal angular intervals on the outer periphery of the ring frame in the axial direction of the winding frame, and connecting the plurality of ring frames to each other. Stick Coolant filtering element in the chip discharge conveyor, characterized in that elastically deformed catenary shape inwardly between a plurality of ring frames by winding tension of the element wire wound around the outside of the rod. The coolant filtering element in the chip discharge conveyor according to claim 1, wherein the element wire is made of metal or engineering plastic.

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