JP2011110610A - Device and method of separating grinding sludge included in grinding fluid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove flotation chippings and abrasive grains which are non-magnetic material, from grinding fluid. <P>SOLUTION: The device of separating grinding sludge included in grinding liquid includes: a magnetic conveyer 6 attracting grinding sludge S with magnetic attraction force and moving that in a discharging direction; an accumulator 21 accumulating floating grinding sludge FS floating on a liquid surface of the grinding fluid L of the grinding sludge, in a predetermined accumulating area CA of a separating tank 4; a collector 22 immersed in the grinding fluid L so as to at least partially contact with the floating grinding sludge FS in regard to the floating sludge FS accumulated in the accumulating area CA by the accumulator 21, and then pulled up from the grinding fluid L to make the floating grinding sludge FS adhere to a surface; and a condenser 30 condensing the grinding sludge adhering to the collector 22 and pulled up from the grinding fluid L once. Massive grinding sludge KS condensed by the condenser 30 is put into the grinding fluid L again and settled down on a non-magnetic plate 5 to be discharged by the magnetic conveyer 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus and method for separating grinding sludge contained in a grinding fluid, and more particularly to an apparatus and method for efficiently separating ultrafine sludge generated in a superfinishing polishing process.

  In a coolant apparatus that supplies a grinding fluid such as a coolant or grinding oil to a grinding machine such as a grinding machine that is a machine tool, sludge is mixed when the grinding fluid is circulated. Sludge is cutting chips that are grinding scraps, abrasive grains of a grindstone, and the like. Of the sludge contained in such a grinding fluid, large sludge can be removed by filtration. However, it is not easy to remove fine sludge efficiently.

  In order to remove sludge contained in the liquid, the present inventor has developed a device that performs magnetic induction and discharges (Patent Documents 1 and 2). This apparatus is shown in FIG. The sludge separation device shown in this figure includes a separation tank 4 to which a liquid is supplied, a nonmagnetic plate 5 that is disposed in the separation tank 4 and moves the sludge S to the surface, and a surface of the nonmagnetic plate 5. A magnetic conveyor 6 is provided which adsorbs the sludge S with a magnetic attraction force and moves it in the discharge direction. The nonmagnetic plate 5 includes an adsorbing portion 5A for adsorbing the sludge S contained in the liquid, an inclined portion 5B for transferring the adsorbed sludge S to the outside of the liquid, and a dropping portion for dropping the sludge S from the tip of the nonmagnetic plate 5. 5C. The sludge S is adsorbed on the upper surface of the adsorbing part 5A of the nonmagnetic plate 5 by the magnetic conveyor 6, transferred from the inclined part 5B to the dropping part 5C, and separated from the nonmagnetic plate 5 by the dropping part 5C at the tip. Thereby, fine sludge can also be separated quickly and efficiently.

Japanese Patent No. 2880972 Japanese Patent No. 3313343

  However, the conventional grinding sludge separation apparatus has a problem that the chips that float on the liquid surface cannot be removed. Since the swarf is made of metal, it should normally be precipitated in the grinding fluid. However, depending on the shape of the swarf, there are some which are difficult to settle or do not settle. For example, relatively large swarf generated by heavy grinding, for example, swarf of about 100 to 500 μm, can be curled into a string or arc shape, spirally rounded, or entangled in fiber May form. Such shaped chips have a large surface area and are likely to float in the grinding fluid. The size of the chips depends on the metal to be searched and the type of grinding (whether heavy grinding or superfinishing, etc.). Recovery is extremely difficult. Also, it is not easy to magnetize such deformed chips.

  In addition, if the grinding fluid is water-soluble, foaming is likely to occur during circulation. The chips to which the bubbles are attached rise with the bubbles and exist on the liquid surface. In particular, an irregularly shaped swarf tends to cause bubbles to adhere to the surface as compared to a granular or powdery swarf. Such floating chips cannot be discharged as they are, unlike the chips precipitated in the grinding fluid. As a result, the floated chips continue to stay on the liquid level without being discharged, resulting in a film or layer (cake layer or sponge layer) applied to the foam. The film-like swarf remaining on the liquid surface and not discharged increases as the grinding continues and becomes thicker. As the amount of the grinding fluid relatively decreases with this, the supply port of the pump that circulates the grinding fluid is finally closed, the supply of the grinding fluid is shut off, and the grinding process is interrupted.

  In order to prevent this, it is necessary to eliminate the membrane-like floating chips, and conventionally, it has been necessary to scrape the membrane-like chips manually or use a large removal device. However, manual removal is extremely time-consuming. In particular, since the film-like chips are generated even in a short time, it is necessary to frequently stop the line and remove the floating chips, and the efficiency is extremely deteriorated. On the other hand, a large removal device removes floating chips by filtering with a filter. However, replacement work due to clogging of the filter itself is frequently required, and it still takes time and effort. There is also a problem that the cost for replacement and disposal of the filter increases. In addition, such devices are large and have a centralized coolant system that connects and uses the coolant devices of multiple grinding machines, and are extremely complex and expensive, so they can be added to individual grinding machines. Thus, there has been a demand for an effective method for removing floating chips.

  In addition, the sludge in the grinding liquid contains inorganic particles such as powdery abrasive grains and dust with which the grindstone is worn, in addition to the chips. Since the cutting powder is made of metal, it can be removed by magnet adsorption. However, since the inorganic particles are non-magnetic materials having no magnetism, a method using magnetic adsorption cannot be used. The proportion of such non-magnetic precipitates contained in the sludge depends on the grinding object and the type of grindstone to be used.For example, when an alumina grindstone is used as the grindstone, the proportion of abrasive grains is Since it is about 30% of the sludge, it is necessary to collect abrasive grains. However, conventionally, the abrasive grains cannot be discharged, and there is no choice but to clean the bottom of the tank by the operator's hand.

  The present invention has been made to solve the conventional problems. A main object of the present invention is to provide an apparatus and a method for separating a grinding sludge contained in a grinding fluid that can automatically remove floating chips with a simple configuration and can also remove non-magnetic abrasive grains. There is to do.

Means for Solving the Problems and Effects of the Invention

  To achieve the above object, according to the grinding sludge separation device contained in the first grinding fluid of the present invention, the separation tank 4 to which the water-soluble grinding fluid L containing the grinding sludge S is supplied, A nonmagnetic plate 5 is disposed in the separation tank 4 and causes the grinding sludge S to settle on the upper surface with a magnetic attractive force and its own weight, and is disposed on the back surface of the nonmagnetic plate 5. And a magnetic conveyor 6 for attracting and moving the grinding sludge S to the discharge direction by a magnetic attraction force on the surface of the grinding sludge, floating on the liquid surface of the grinding fluid L in the grinding sludge The floating grinding sludge FS is collected in a predetermined accumulation area CA of the separation tank 4 and at least a part of the floating grinding sludge FS collected in the accumulation area CA by the accumulation means 21 The floating grinding The grinding means is immersed in the grinding liquid L so as to come into contact with the sludge FS, and is pulled up from the grinding liquid L so that the floating grinding sludge FS adheres to the surface. Condensing means 30 for condensing the grinding sludge pulled up from L, and the lump of grinding sludge KS condensed by the condensing means 30 is again put into the grinding liquid L and settled on the non-magnetic plate. , And can be discharged by the magnetic conveyor 6. As a result, a part of the suspension is immersed in the grinding fluid, and the foamed floating grinding sludge floating on the surface of the grinding fluid is attached to the collecting means and pulled up. By adding it to the grinding liquid in an increased state, the floating grinding sludge can be settled as a lump. The condensed massive grinding sludge serves as a scraper, and nonmagnetic deposits such as abrasive grains are also discharged to the outside together with the massive grinding sludge. Thereby, fine grinding sludge such as floating grinding sludge and abrasive grains can be efficiently discharged without using a filter.

  Further, according to the apparatus for separating grinding sludge contained in the second grinding fluid, the second magnet 23 can be provided inside the collecting means 22. Accordingly, the floating grinding sludge can be adsorbed by the force of the second magnet, and the floating grinding sludge can be easily separated from the grinding fluid and pulled up.

  Furthermore, according to the grinding sludge separation device contained in the third grinding fluid, the recovery means 22 is plate-shaped and can be immersed substantially perpendicularly to the grinding fluid L. Thereby, since floating grinding sludge can be adhered to both surfaces of the plate-shaped immersion plate almost evenly, an advantage that the amount of adhesion can be doubled can be obtained.

  Furthermore, according to the separation apparatus for the grinding sludge contained in the fourth grinding liquid, the lifting position HP at which the floating grinding sludge FS is pulled up from the grinding liquid L by the recovery means 22, and the grinding sludge condensed by the condensation means 30. Can be set to a position different from the charging position TP at which is poured into the grinding liquid L. As a result, the floating grinding sludge pulled up by the collecting means can be re-introduced into the grinding fluid from a position away from the lifting position, and the re-entered floating grinding sludge comes into contact with the collecting means again, or the collecting means This prevents the floating grinding sludge from being hindered from being lifted, and allows the floating grinding sludge to be efficiently lifted and recharged from the grinding fluid, thereby smoothly separating the grinding sludge.

  Furthermore, according to the separation apparatus for the grinding sludge contained in the fifth grinding fluid, the charging position TP can be arranged on the upstream side in the transport direction of the magnetic conveyor 6 with respect to the pulling position HP. Thereby, since the distance stroke | distance in which the condensed lump grinding sludge is conveyed with a magnetic conveyor becomes long, it can anticipate that the collection | recovery effect of nonmagnetic substance deposits, such as an abrasive grain, is heightened.

  Furthermore, according to the apparatus for separating grinding sludge contained in the sixth grinding fluid, the condensing means 30 can be a scraper 30A that scrapes off the floating grinding sludge FS adhering to the surface of the collecting means 22. Thereby, the floating grinding sludge adhering to the collection | recovery means surface with a scraper can be condensed efficiently, a bubble can be extracted, and a density can be raised.

  Furthermore, according to the separating apparatus for grinding sludge contained in the seventh grinding fluid, the recovery means 22 can be a rotating plate 22A that rotates about a rotation axis. Thus, by rotating the rotating plate and immersing a part thereof in the grinding liquid, the floating grinding sludge can be attached and pulled up very efficiently.

  Furthermore, according to the apparatus for separating the grinding sludge contained in the eighth grinding fluid, the magnetizing means for forcibly magnetizing the settling grinding sludge SS that has settled in the grinding fluid L of the grinding sludge. The sedimentation grinding sludge SS magnetized by the magnetizing means is allowed to settle on the non-magnetic plate 5 and discharged by the magnetic conveyor 6. As a result, among the grinding sludge, the floating grinding sludge floating on the surface of the grinding liquid is collected by the collecting means, while the settled grinding sludge settled in the liquid is magnetized by the magnetizing means, This grinding sludge can also be effectively removed from the grinding fluid.

  Furthermore, according to the method for separating the grinding sludge contained in the ninth grinding fluid, at least a part of the collecting means 22 is immersed in the grinding fluid L and pulled up from the grinding fluid L, so that the liquid of the grinding fluid L A step of adhering the floating grinding sludge FS floating on the surface to the surface of the recovery means 22, a step of condensing the grinding sludge attached to the recovery means 22 and once pulled up from the grinding liquid L, and a condensed lump And a step of throwing the grinding sludge KS into the grinding fluid L again. The bulk grinding sludge KS put into the grinding fluid L is settled on the nonmagnetic plate 5 and disposed on the back surface of the nonmagnetic plate 5. It can be adsorbed by the magnetic conveyor 6 provided and discharged together with the nonmagnetic precipitate NM contained in the grinding liquid L. As a result, a part of the suspension is immersed in the grinding fluid, and the foamed floating grinding sludge floating on the surface of the grinding fluid is attached to the collecting means and pulled up. By adding it to the grinding liquid in an increased state, the floating grinding sludge can be settled as a lump. The condensed massive grinding sludge serves as a scraper, and nonmagnetic deposits such as abrasive grains are also discharged to the outside together with the massive grinding sludge. Thereby, fine grinding sludge such as floating grinding sludge and abrasive grains can be efficiently discharged without using a filter.

It is a top view which shows the state which connected the separation apparatus of the grinding sludge contained in the grinding fluid which concerns on Embodiment 1 of this invention to the machine tool. It is the longitudinal cross-sectional view which looked at the separation apparatus of the grinding sludge of FIG. 1 from the clean layer side. It is an expansion perspective view of the collection | recovery means of FIG. It is a side view of the collection | recovery means of FIG. It is a longitudinal cross-sectional view of the collection | recovery means of FIG. It is a longitudinal cross-sectional view of the collection | recovery means which concerns on a modification. It is a side view of the collection | recovery means which concerns on another modification. It is sectional drawing of the apparatus which removes the sludge contained in the liquid which this inventor developed previously.

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment shown below exemplifies a grinding sludge separation device and separation method included in the grinding liquid for embodying the technical idea of the present invention, and the present invention is included in the grinding liquid. The grinding sludge separation device and separation method to be used are not specified as follows. Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the embodiments are indicated in the “claims” and “means for solving problems” sections. It is appended to the members shown. However, the members shown in the claims are not limited to the members in the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the examples are not intended to limit the scope of the present invention only unless otherwise specified, but are merely illustrative examples. Only. In addition, the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are configured by the same member and the plurality of elements are shared by one member. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.
(Embodiment 1)

  1 to 7 show a separating apparatus 100 for grinding sludge contained in a grinding fluid according to Embodiment 1 of the present invention. In these drawings, FIG. 1 is a plan view showing a state in which a grinding sludge separation device is connected to a machine tool, FIG. 2 is a longitudinal sectional view of the grinding sludge separation device of FIG. 1 viewed from the clean layer side, and FIG. FIG. 4 is a side view of the collecting means, FIG. 5 is a longitudinal sectional view of the collecting means, FIG. 6 is a longitudinal sectional view of the collecting means according to the modification, and FIG. 7 is a collecting according to another modification. A side view of the means is shown respectively.

  A separating apparatus 100 for grinding sludge shown in these drawings separates grinding sludge contained in the grinding liquid L, in particular, floating sludge FS that is fine sludge and floats on the surface of the grinding liquid L. Is used to discharge the nonmagnetic precipitate NM. The separation device 100 includes a separation tank 4 to which a grinding liquid L, which is a cutting oil containing grinding sludge, is supplied, and a nonmagnetic plate that adsorbs and discharges the grinding sludge contained in the grinding liquid L of the separation tank 4 to the surface. 5 and a magnetic conveyor 6 that is attracted to the non-magnetic plate 5 by a magnetic attraction force.

  As shown in the plan view of FIG. 1, the separating device 100 is connected to the machine tool KK, is supplied with the grinding fluid L used in the machine tool KK, and separates the grinding sludge contained in the grinding fluid L, thereby Circulate to the machine KK side. The machine tool KK is a grinding machine such as a grinding machine, and can use a grinding machine for heavy grinding or super finishing. A general grindstone such as an alumina grindstone or a diamond grindstone is used for the grindstone of the grinding machine. In particular, alumina grindstones are widely used because they are easy to dress up. However, when an alumina grindstone is used, the grindstone is worn and a lot of abrasive grains are generated. The sludge mixed in the grinding liquid L is about 7: 3 in heavy grinding when the metal to be ground (for example, iron) and abrasive grains are compared. If a diamond grindstone is used, the abrasive grains can be reduced to several percent, but in this case, dressing up becomes difficult.

The grinding liquid L used for the machine tool KK is a coolant liquid, a grinding oil, or the like, and the separation device can be suitably used for a water-soluble grinding liquid that is particularly liable to foam. The amount of grinding fluid to be used is adjusted according to the purpose of grinding. For example, in the super-finished fine sludge, the amount of liquid is relatively small, but in heavy grinding, the amount of liquid is 10 times or more that of fine sludge. Sludge in grinding is mixed in the grinding fluid.
(Accumulating means 21)

The separation tank 4 is a coolant tank that circulates the grinding liquid L and separates the grinding sludge. In the separation tank 4 shown in FIG. 1, a supply pipe 7 for the grinding liquid L is connected to one end, and a discharge pump 11 for discharging the clear grinding liquid L from which fine sludge has been removed is disposed at the other end. . The separation tank 4 bisects the inside of the tank with a partition plate 21A along the longitudinal direction, and the end of the separation tank 4 is provided with an opening in which the partition plate 21A is notched. Thereby, the grinding fluid L supplied from one end of the separation tank 4 is folded back at the other end (left side in FIG. 1) provided with the notch KA and flows in the reverse direction. As a result, grinding sludge can be collected at the notch KA. In this way, the partition plate 21 </ b> A functions as the accumulation means 21 that collects the floating grinding sludge FS floating on the liquid surface of the grinding liquid L in the grinding sludge in a predetermined region of the separation tank 4. By defining the flow path of the grinding liquid L by the partition plate 21A, the grinding liquid L circulates in the separation tank 4 and is circulated to the machine tool KK side as shown by the white arrow in FIG. In the example of FIG. 1, the upper side of the partition plate 21A is a dirty tank DS through which the grinding liquid L before separation flows, and the lower side of the partition plate 21A is a clean tank CS after separating the grinding liquid L. The downstream side (lower left in the figure) where the cutout KA of 21A is provided is defined as an accumulation area CA for separating the floating grinding sludge FS.
(Filtering means)

  Further, a filtering means such as a filter may be disposed in the supply path or flow path of the grinding liquid L as necessary. Thereby, relatively large sludge other than fine sludge in the grinding sludge can be easily separated and removed. The filtering means uses, for example, a perforated plate 8 and allows the grinding liquid L to pass through the perforated plate and supply or circulate it to the separation tank 4. For the perforated plate 8, a punching metal in which a large number of small through holes are provided in a metal plate or a metal mesh having a small mesh can be used. The perforated plate 8 is mounted so as to be detached from the liquid surface of the separation tank 4 in a horizontal posture. The removable porous plate 8 can be easily cleaned when it becomes dirty. Further, the removable porous plate 8 can be easily replaced with an optimum one having different through holes and meshes depending on the viscosity of the supplied grinding liquid L. The through holes or meshes of the perforated plate 8 are ground over the entire surface or almost the entire surface with the grinding liquid L stored at a predetermined depth on the upper surface so that the grinding fluid L supplied to the upper surface can be uniformly dispersed and permeated. Designed to allow liquid L to permeate. A perimeter wall 19 is provided around the perforated plate 8 so as to store the grinding liquid L at a predetermined depth on the upper surface of the perforated plate 8 to form a reservoir box 20. The grinding liquid L supplied to the reservoir 20 is temporarily stored here, passes through the perforated plate 8, and is uniformly dispersed and dropped. The sedimentation sludge SS is settled on the nonmagnetic plate 5, and the grinding liquid L from which the sedimentation sludge SS has been removed is discharged by the discharge pump 11.

  In the separation apparatus shown in the figure, the nonmagnetic plate 5 is used as the bottom plate of the separation tank 4. In addition, it cannot be overemphasized that a nonmagnetic plate can also be arrange | positioned inside a separation tank separately from the baseplate of a separation tank. However, an apparatus that uses the nonmagnetic plate 5 as the bottom plate of the separation tank 4 can have the simplest structure.

  The nonmagnetic plate 5 is made of a nonmagnetic metal such as stainless steel, aluminum, or copper. This non-magnetic plate 5 raises the suction grinding sludge SS contained in the grinding liquid L supplied from the supply pipe 7 and the sedimentation grinding sludge SS of this suction part 5A to the outside of the grinding liquid L. An inclined portion 5B and a dropping portion 5C that separates the settling sludge SS fed to the outside of the grinding fluid L by the inclined portion 5B from the nonmagnetic plate 5 are provided.

  In addition to making the upper surface smooth, the non-magnetic plate 5 is further metal-plated on the surface, or a hollow layer is formed on the surface, or the surface is polished to be a mirror-finished surface. .

  The metal plating is chrome plating or gold plating. Chrome plating has the advantage that it can be made into a mirror surface with a low cost, a hard surface, and less unevenness. The metal-plated mirror-treated surface becomes a mirror surface with very few surface irregularities due to the plating layer. The thickness of the plating layer is preferably 3 to 100 μm, more preferably 10 to 50 μm. Chrome plating is magnetically shielded and weakens the force with which the magnet magnetically attracts the settling sludge SS. For this reason, the chrome plating is preferably a thin film as thin as possible, and the surface of the nonmagnetic plate 5 is preferably a mirror surface. However, if the chrome plating is too thin, the surface of the nonmagnetic plate 5 cannot be an ideal mirror surface. For this reason, the film thickness of the chrome plating layer is preferably 5 to 50 μm. A copper plate is suitable for the nonmagnetic plate 5 whose surface is mirror-finished by metal plating. It is because it is easy to adhere metal plating. However, a stainless steel plate or an aluminum plate can also be made into a mirror-finished surface by metal plating on the surface.

  The enamel layer is uniformly coated with a low melting point glaze on the surface of the non-magnetic plate 5 and heated to a temperature at which it flows into a molten state to sinter the surface in a mirror state. The enamel layer has no magnetic shielding effect like chrome plating. For this reason, there is a feature that the surface of the nonmagnetic plate can be made a mirror surface by increasing the thickness. The film thickness of the enamel layer is, for example, 0.1 to 2 mm. The enamel layer is extremely hard and durable.

  The non-magnetic plate 5 whose surface is polished to a mirror surface is polished to a mirror surface having a surface roughness of ▽▽▽ (surface roughness symbol) or more to obtain a mirror surface. The nonmagnetic plate 5 uses a fine abrasive to polish the surface of the nonmagnetic plate 5 to a mirror surface. A stainless steel plate is suitable for the nonmagnetic plate 5. This is because corrosion of the mirror-finished surface can be prevented. The nonmagnetic plate 5 having this structure has a feature that the surface can be a mirror-finished surface at the lowest cost.

  The adsorption unit 5 </ b> A is configured by a horizontal part of the bottom plate of the separation tank 4. In the figure, the left portion of the bottom plate is an inclined surface that is inclined upward in the direction of fine sludge transfer, and this inclined surface constitutes the inclined portion 5B. The inclined portion 5B extends from the top to the upper side of the liquid level. The inclined portion 5B is connected to a dropping portion 5C that is curved with a predetermined radius of curvature at the upper end and descends vertically. The dropping part 5C is provided at the tip of the nonmagnetic plate 5, and a reservoir 12 for fine sludge is provided below the dropping part 5C.

  The magnetic conveyor 6 is disposed below the nonmagnetic plate 5. This is because the settling ground sludge SS is magnetized to agglomerate and settle, and is attracted by a magnetic attraction force and transferred along the nonmagnetic plate 5. The magnetic conveyor 6 includes a plurality of permanent magnets 6 </ b> A that move close to the lower surface of the nonmagnetic plate 5. The permanent magnets 6A are connected in parallel at regular intervals. The plurality of permanent magnets 6A are connected to the endless chain 6B of the magnetic conveyor 6 at both ends, and are connected at a predetermined interval. The endless chain 6B connects the elongated permanent magnets 6A at regular intervals.

In the permanent magnet 6A connected by the chain 6B, the entire opposing surface that moves close to the back surface of the non-magnetic plate 5 is either the north pole or the south pole, and the entire opposite surface on the opposite side is the opposing surface. Different magnetic poles are used. That is, the permanent magnet 6A having the opposite surface as the N pole has the opposite surface as the S pole, and the permanent magnet 6A having the opposite surface as the S pole has the opposite surface as the N pole.
(Forced magnetization function)

  Furthermore, it is possible to provide a magnetizing means for forcibly magnetizing the settling ground sludge SS that has settled in the liquid of the grinding liquid L in the grinding sludge. The magnetizing means sets the forced magnetization region 18 above the nonmagnetic plate 5, magnetizes the settling sludge SS contained in the supplied grinding liquid L, aggregates it with a magnetic attractive force, and quickly precipitates it. it can. The settled sedimentation sludge is discharged by the magnetic conveyor 6.

  An example of the magnetizing means is shown in FIG. In this example, the permanent magnets 6A fixed to the magnetic conveyor 6 at a predetermined interval are arranged so that the magnetic poles on the opposing surface are adjacent and different from each other, and the upper portion of the non-magnetic plate 5 is forced magnetic region. 18 and so on. In this case, the permanent magnets 6A arranged in the transfer direction at predetermined intervals are arranged so that the magnetic poles on the opposing surface are alternately different from the N pole, S pole, N pole, S pole,. The permanent magnet 6A disposed in this state can make the magnetic flux density of the forced magnetization region 18 provided above the nonmagnetic plate 5 uniform. This is because magnetic flux can pass between the N pole and the S pole that are arranged adjacent to each other. The forced magnetization region 18 has the highest magnetic flux density in the vicinity of the facing surface of the permanent magnet 6A. This is because it is closest to the magnetic pole of the permanent magnet 6A. The magnetic flux density is lowest in the middle between adjacent permanent magnets 6A.

  Further, the magnetic conveyor 6 in which the opposing surfaces are N pole and S pole and the opposite surfaces are connected by a magnetic metal such as a chain 6B, allows the magnetic flux on the opposite surface to pass through the magnetic flux metal such as the chain 6B and the magnetic resistance therebetween. Can be reduced. Therefore, the magnetic resistance of the magnetic circuit connecting the two adjacent permanent magnets 6A between the opposing surface and the opposite surface can be reduced, and the magnetic flux density of the opposing surface can be increased, that is, the magnetic flux in the forced magnetization region 18 can be increased. .

  The forced magnetization region 18 provided by the permanent magnet 6A is magnetized by passing the sedimentation sludge SS therethrough. The magnetized settling ground sludge SS is attracted to each other by a magnetic attraction action and is largely agglomerated. The agglomerated sedimentation sludge SS is quickly settled inside the grinding liquid L and is settled on the adsorption part 5A of the nonmagnetic plate 5.

  The magnetic conveyor 6 is provided with a chain guide 6F in the transfer path of the chain 6B in order to move the permanent magnet 6A close to the lower surface of the nonmagnetic plate 5. The chain 6B is moved to a position determined by the chain guide 6F, and the permanent magnet 6A is moved closer to the lower surface of the nonmagnetic plate 5. In order to move the chain 6B, two chains 6B are hung on the sprocket 6C. The sprocket 6C is fixed to both ends of the rotating shaft 6D, and the rotating shaft 6D is driven by a motor 6E to move the chain 6B.

  The speed of the permanent magnet 6A moved by the chain 6B is set to about 1 cm / second, for example. However, the moving speed of the permanent magnet 6A can be set to 0.3 to 5 cm, for example. If the moving speed of the permanent magnet 6A is too slow, the adsorbed sedimentation sludge SS cannot be discharged efficiently. On the contrary, if the moving speed of the permanent magnet 6A is too fast, the adhering sedimentation grinding sludge SS cannot be transferred. The moving speed of the permanent magnet 6A is determined so that the settling sludge SS can be moved efficiently.

  As shown in FIG. 2, the moving direction of the settling sludge SS by the magnetic conveyor 6 is opposite to the flowing direction of the grinding liquid L. This avoids the situation where the sedimentation sludge SS settled on the bottom surface of the separation tank 4 concentrates and accumulates on the downstream side, and disperses the sediment by moving the sedimentation sludge SS precipitated in the direction opposite to the flow. It can be made uniform, and the situation where the sedimentation grinding sludge SS which settled is attracted | sucked by the discharge pump 11 or obstruct | inhibited suction can be eliminated.

As described above, in the clean tank CS of the separation tank 4 as shown in FIG. 2, the grinding sludge S is settled on the upper surface of the nonmagnetic plate 5 by the magnetic attraction force and its own weight, With the magnetic conveyor 6 arranged on the back surface, the sedimentation sludge SS is attracted by the magnetic attraction force and moved in the discharge direction. Although 20% of the ground sludge settles depending on the grinding liquid L and the type of grinding object, the ground sludge SS thus settled can be discharged using the magnetic conveyor 6.
(Recovery means 22)

  On the other hand, there is a thing that does not settle in the grinding sludge, that is, a floating grinding sludge FS that floats on the surface of the grinding liquid L. Such floating grinding sludge FS is separated from the grinding liquid L by the collecting means 22. This state will be described with reference to FIG.

  The collecting means 22 immerses at least a part of the floating grinding sludge FS collected in the collecting area CA by the collecting means 21 in the grinding liquid L so as to contact the floating grinding sludge FS and pulls it up from the grinding liquid L. This causes the floating grinding sludge FS to adhere to the surface. In the example of FIG. 3, the collecting means 22 is constituted by a disk-shaped rotating plate 22A. The rotating plate 22A is rotated in a fixed direction by a rotating means such as a motor around a rotating shaft. The rotating plate 22A has a portion that is immersed in the grinding liquid L and a portion that is not immersed. Preferably, an area of less than half, more preferably 3/10 to 4/10, most preferably about 1/3 of the diameter of the rotating plate 22A is immersed in the grinding liquid L so that the rotating shaft is not immersed in the grinding liquid L. The rotating plate 22A is fixed at the position to be operated. By rotating the rotating plate 22A, the portion immersed in the grinding liquid L comes into contact with the floating grinding sludge FS floating on the liquid surface, and the floating grinding sludge FS adhering to the rotation is pulled up from the grinding liquid L and separated. The The separated floating grinding sludge FS contains bubbles and is ruptured and disappeared to some extent by being pulled up from the grinding fluid L. By removing the bubbles, the density of the grinding sludge is slightly increased. Then, the remaining floating grinding sludge FS is condensed by the condensing means 30 as shown in FIG. 4, scraped off from the surface of the rotating plate 22A, and put into the grinding liquid L again. Since the condensed sludge of the grinding sludge has a higher density, it now settles without floating in the grinding liquid L. The settled lump grinding sludge KS is deposited on the nonmagnetic plate 5 and discharged by the magnetic conveyor 6.

  The floating grinding sludge FS adheres to the surface of the rotating plate 22A when the grinding liquid L is wet. Furthermore, by providing the second magnet 23 inside the recovery means 22, it is possible to add an attracting force due to magnetic force, increase the adhesion amount, and separate a larger amount of floating grinding sludge FS from the grinding liquid L at a time. it can. As shown in the cross-sectional view of FIG. 5, the second magnet 23 is provided with a space inside the rotating plate 22 </ b> A, and can arrange a magnetic force through the rotating plate 22 </ b> A. The rotating plate 22A is made of a non-magnetic material such as resin that easily transmits magnetic force. The second magnet 23 is provided in a region where the grinding liquid L is immersed on the circumference of the rotating plate 22A. Although the 2nd magnet 23 can also be arrange | positioned continuously along a periphery, you may provide partially as shown with the broken line in the perspective view of FIG. 3, and the side view of FIG.

  The rotational speed of the rotating plate 22A is a slow speed at which the floating grinding sludge FS can be sufficiently adhered in consideration of the amount of the grinding fluid L and the amount of the floating grinding sludge FS generated, and the discharge of the floating grinding sludge FS. Set to fast speed to increase efficiency. For example, it is set to 5 to 20 times / second, preferably 10 to 15 times / second, and more preferably about 12 times / second.

  In the example of FIG. 2, the rotating plate 22 </ b> A is disposed so as to intersect the flow of the grinding liquid L. That is, in the plan view of FIG. 1, the board surface is arranged to be horizontal so as to resist the vertical movement of the grinding liquid L flowing from the dirty tank DS into the clean tank CS. By disposing the rotating plate 22A so as to resist the flow, the floating grinding sludge FS moving on the liquid surface can be reliably dammed by the rotating plate 22A and supplemented. However, this arrangement is only an example. For example, the rotating plate may be arranged in a posture in which the board surface is vertical in FIG. 1 on the clean tank CS side. In the example of FIG. 2, only one collecting unit 22 is provided, but it goes without saying that a plurality of collecting units may be provided. For example, a plurality of rotating plates are provided in parallel so as to be orthogonal to the flow direction of the clean tank CS, or the rotating plates are arranged side by side so as to cover a wide area of the cross section of the flow path of the clean tank CS. Can be arranged.

Furthermore, the arrangement posture of the rotating plate 22A is inserted into the liquid almost perpendicularly to the liquid surface of the grinding liquid L in the example of FIG. As a result, the floating grinding sludge FS can be captured and adhered on both surfaces of the rotating plate 22A. However, the rotating plate can be arranged in an inclined posture with respect to the liquid surface. For example, in the modification shown in FIG. 6, the rotating plate 22 </ b> C is disposed obliquely so as to scoop up the liquid level with respect to the flow of the grinding liquid L. As a result, the floating grinding sludge FS that has been dammed is attached to the rotating plate 22C so as to be scooped up, so that the adhesion effect on this surface can be enhanced.
(Condensing means 30)

  The condensing means 30 condenses the grinding sludge that is attached to the collecting means 22 and once pulled up from the grinding liquid L. In the example of FIG. 4, the scraper 30A is configured to scrape off the floating grinding sludge FS adhering to the surface of the rotating plate 22A. The scraper 30A is preferably made of an elastic member such as rubber, and is held in a posture in which it is elastically pressed against the surface of the rotating plate 22A. As a result, the floating grinding sludge FS conveyed along with the rotation of the rotating plate 22A is dammed by the scraper and condensed to become a lump grinding sludge KS. In addition, the lump grinding sludge KS having a certain size is scraped off, dropped, and thrown into the grinding liquid L again. At this time, in order to define the charging position TP of the massive grinding sludge KS, a guide means for guiding the scraped massive grinding sludge KS to a predetermined charging position TP is provided. In the example of FIG. 4, the scraper 30 </ b> A that is the condensing unit 30 also serves as a charging unit that guides the lump grinding sludge KS to be charged again into the grinding liquid L. That is, the plate-shaped scraper 30A is pressed against the surface with one end edge intersecting the circumferential direction of the rotating plate 22A, and the other end is protruded from the rotating plate 22A and separated from the rotating plate 22A. It is extended to the position where it was moved. Further, the scraper 30A is fixed in a posture in which the protruding side is lower than the scraping side so as to incline downward from the scraping side toward the protruding side (falling side). Thereby, the lump grinding sludge KS scraped off from the surface of the rotary plate 22A does not fall to the left side of the scraper 30A in FIG. 4, but moves so as to roll on the upper surface of the scraper 30A toward the right side, that is, the other end on the protruding side. And falls downward from the other end. Preferably, as shown in FIG. 4, a cylindrical guide that guides the lump grinding sludge KS to drop from a predetermined charging position TP is provided on the falling side of the other end of the scraper 30A. The position can be more reliably defined at a desired position.

  In this way, the pulling position HP where the floating grinding sludge FS is pulled up from the grinding liquid L by the collecting means 22 and the charging position TP where the grinding sludge condensed by the condensing means 30 is thrown into the grinding liquid L are set to different positions. Then, after the guide means guides the position away from the pulling position HP and then re-enters the grinding fluid L, the re-entered floating grinding sludge FS comes into contact with the recovery means 22 again or floats by the recovery means 22. The situation of hindering the lifting of the grinding sludge FS can be avoided, the floating grinding sludge FS can be efficiently lifted from the grinding liquid L and recharged, and the grinding sludge can be separated smoothly.

  In particular, as shown in FIG. 4, the charging position TP is arranged on the upstream side in the transport direction of the magnetic conveyor 6 with respect to the pulling position HP, so that the condensed lump grinding sludge KS is transported by the magnetic conveyor 6. Since the process becomes longer, the effect of collecting the nonmagnetic precipitate NM such as abrasive grains is enhanced.

  As shown in FIG. 5, the scraper 30A is provided on both surfaces of the rotating plate 22A. Thereby, it is possible to condense the grinding sludge adhering to both surfaces to generate more lump grinding sludge KS and re-inject it.

  As described above, the recovery means 22 using the rotating plate 22A can hold the rotating shaft in a fixed position, and can continuously immerse and lift the grinding liquid L while minimizing the movable part. ,preferable. However, the recovery means is not limited to this configuration, and any configuration can be used as long as it can be immersed in the grinding liquid L and pulled up. For example, as a modification, the recovery means 22B shown in FIG. 7A is moved up and down by a crank mechanism, and the immersion and lifting of the grinding liquid L are repeated. The collecting means 22B can be configured in a plate shape, a prismatic shape, a cylindrical shape, or the like. The advantage of using the crank mechanism is that a large area of the recovery means 22B, for example, the entire area can be immersed in the grinding liquid L, so that the amount of floating grinding sludge FS that can be adhered at a time can be increased. On the other hand, since there are more movable parts, the amount of mechanical maintenance is larger than that of the rotating plate. Further, as shown in FIG. 7B, as the aggregating means, a scraper 30B that scrapes the floating grinding sludge FS adhering to the surface of the collecting means 22B by rotating or swinging in a wiper manner can be used.

  In this way, the foam-like floating grinding sludge FS floating on the surface of the grinding liquid L is attached to the collecting means 22 and pulled up, thereby effectively removing the foam-like floating grinding sludge FS, which has been difficult to process conventionally. Can be processed. In addition, in this method, the floating grinding sludge FS once pulled up is not discharged as it is, but is extracted again in the grinding liquid L in a state where the bubbles are extracted and condensed and the density is increased. Since the bulk grinding sludge KS is increased in density, it can be settled in the grinding liquid L without floating again. In particular, in addition to increasing its own weight due to condensation, it is also easily affected by the magnetic attraction force of the magnetic conveyor 6, so that it can be surely settled.

Further, by using this massive grinding sludge KS, it is possible to discharge the nonmagnetic precipitate NM that could not be discharged by magnetism. That is, as shown in the cross-sectional view of FIG. 2, the massive grinding sludge KS that has been re-settled settles down by its own weight and magnetic attractive force, and accumulates on the upper surface of the nonmagnetic plate 5. Then, the massive grinding sludge KS is attracted by the magnetic attraction force by the magnetic conveyor 6 disposed on the back surface of the nonmagnetic plate 5 and moved in the discharging direction (left side in FIG. 2). At this time, since the lump of grinding sludge KS moves on the nonmagnetic plate 5, inorganic particles such as abrasive grains and dust, which are nonmagnetic precipitates NM that are not originally affected by magnetism, also lump. It becomes the shape pushed by the grinding sludge KS and is moved together as shown in FIG. As a result, the lump grinding sludge KS acts like a scraper, and the non-magnetic precipitate NM also climbs the inclined portion 5B and passes through the falling portion 5C and is discharged from the separation tank 4 to be a fine sludge reservoir. 12 is sent. In this way, the fine sludge separation device included in the grinding liquid L according to the present embodiment is configured to remove both the foam-like floating grinding sludge FS and the non-magnetic substance precipitate NM, which have been extremely difficult to separate conventionally. It was possible to effectively drain from the grinding liquid L. In particular, since this method does not use a filter, maintenance work such as cleaning and replacement of the filter can be omitted, and since it can be realized with an extremely simple configuration such as a rotating plate, it is inexpensive, and is particularly added to existing coolant devices. It has an excellent feature that it can.
(Method for separating fine sludge contained in grinding fluid)

  Finally, a method for separating the grinding sludge contained in the grinding fluid using this separation apparatus will be described below. First, at least a part of the recovery means 22 is immersed in the grinding fluid L sent from the working fluid to the separation tank 4. Then, by pulling up from the grinding liquid L, the floating grinding sludge FS floating on the surface of the grinding liquid L is attached to the surface of the recovery means 22. Here, by immersing about 1/3 of the lower part of the rotating plate 22A in the grinding liquid L, the foamed floating grinding sludge FS can be effectively adhered.

  Next, the grinding sludge adhering to the recovery means 22 and once pulled up from the grinding liquid L is condensed by the scraper 30 </ b> A as the condensation means 30. Then, the condensed lump of grinding sludge KS is scraped off from the rotating plate 22A and is put into the grinding liquid L again. The supplied massive grinding sludge KS is settled on the nonmagnetic plate 5 by the action of its own weight and magnetic force. Then, the lump grinding sludge KS adsorbed on the magnetic conveyor 6 disposed on the back surface of the nonmagnetic plate 5 is moved on the nonmagnetic plate 5 in the discharge direction. At this time, since the lump grinding sludge KS extrudes the nonmagnetic precipitate NM such as abrasive grains that are also settled on the nonmagnetic plate 5, they are discharged from the separation tank 4 by ascending the inclined portion 5B together. It falls into the tank 12 and is separated. As a result, such impurities are separated from the grinding fluid L and are circulated to the machine tool KK side in a purified state.

  As described above, according to the present embodiment, among the grinding sludge, floating grinding sludge floating on the surface of the grinding liquid, which is difficult to be attracted or magnetized by magnetic force, can be collected by the collecting means. . Further, the sedimentation sludge settled in the grinding liquid can be forcedly magnetized and discharged by the forced magnetization means. Further, sludge having a larger particle diameter can be excluded by a filter such as a filtering means using the perforated plate 8. Thus, it becomes possible to effectively separate and discharge the grinding sludge in the clean tank CS regardless of the shape and size.

  Sedimentation grinding sludge refers to a component of fine grinding sludge excluding floating grinding sludge floating on the liquid surface of the grinding fluid. That is, it is used to include grinding sludge that is sinking in the grinding fluid and grinding sludge that is floating and drifting. The shape and size of the grinding sludge depends on the metal to be ground, the grinding machine (for example, the type of grindstone), the grinding purpose (for example, heavy grinding or superfinishing), etc., but generally occurs in heavy grinding. A relatively large swarf of about 100 to 500 μm, especially when the outer shape is curled or spiral, tends to float on the grinding liquid surface, and becomes a floating grinding sludge. On the other hand, fine chips of 100 μm or less are in the form of powder or granules, so that bubbles are difficult to adhere to and settling sludge is easily settled. Then, both of the settling grinding sludge and the floating grinding sludge can be finally settled on the nonmagnetic plate 5 by the present embodiment, and can be removed from the grinding liquid by the magnetic conveyor 6.

  The separation device and the separation method of the grinding sludge contained in the grinding fluid of the present invention can be suitably used for the coolant device of the heavy grinding machine.

DESCRIPTION OF SYMBOLS 100 ... Grinding sludge separation device 4 ... Separation tank 5 ... Nonmagnetic plate; 5A ... Adsorption part; 5B ... Inclination part; 5C ... Falling part 6 ... Magnetic conveyor; 6A ... Permanent magnet; 6B ... Chain; Rotating shaft; 6E ... Motor; 6F ... Chain guide 7 ... Supply pipe 8 ... Perforated plate 11 ... Discharge pump 12 ... Reservoir 18 ... Forced magnetization region 19 ... Peripheral wall 20 ... Reservoir box 21 ... Accumulating means 21A ... Partition plates 22, 22B ... Recovery means 22A, 22C ... rotating plate 23 ... second magnet 30 ... condensing means 30A, 30B ... scraper S ... grinding sludge FS ... floating grinding sludge KS ... lump grinding sludge SS ... settling grinding sludge L ... grinding fluid CA ... accumulation area HP ... Lifting position TP ... Loading position NM ... Non-magnetic substance precipitate KK ... Machine tool DS ... Dirty tank CS ... Clean tank KA ... Notch

Claims (9)

A separation tank (4) to which a water-soluble grinding fluid (L) containing grinding sludge (S) is supplied;
A non-magnetic plate (5) disposed in the separation tank (4) and configured to settle grinding sludge (S) on the upper surface with a magnetic attraction force and its own weight;
A magnetic conveyor (6) disposed on the back surface of the non-magnetic plate (5), for attracting the grinding sludge (S) to the surface of the non-magnetic plate (5) with a magnetic attraction and moving it in the discharge direction; ,
A grinding sludge separation device comprising:
Accumulation means (21) for collecting the floating grinding sludge (FS) floating on the liquid surface of the grinding fluid (L) in the grinding sludge (S) in a predetermined accumulation area (CA) of the separation tank (4). When,
The floating grinding sludge (FS) collected in the accumulation area (CA) by the collecting means (21) is immersed in a grinding fluid (L) so that at least a part thereof is in contact with the floating grinding sludge (FS). A collecting means (22) for adhering the floating grinding sludge (FS) to the surface by pulling up from the grinding liquid (L);
Condensing means (30) for condensing the grinding sludge attached to the collecting means (22) and once pulled up from the grinding fluid (L),
With
The lump of grinding sludge (KS) condensed by the condensing means (30) is again put into the grinding liquid (L) and settled on the nonmagnetic plate (5), and discharged by the magnetic conveyor (6). An apparatus for separating grinding sludge contained in a grinding fluid. A separator for grinding sludge contained in the grinding fluid according to claim 1,
A separating apparatus for grinding sludge contained in a grinding fluid, wherein a second magnet (23) is provided inside the collecting means (22). A separator for grinding sludge contained in the grinding fluid according to claim 1 or 2,
An apparatus for separating grinding sludge contained in a grinding fluid, wherein the recovery means (22) is plate-shaped and is immersed substantially perpendicularly to the grinding fluid (L). A separation apparatus for grinding sludge contained in the grinding fluid according to any one of claims 1 to 3,
The lifting position (HP) where the floating grinding sludge (FS) is lifted from the grinding liquid (L) by the recovery means (22), and the grinding sludge condensed by the condensation means (30) is put into the grinding liquid (L). Separating device for grinding sludge contained in grinding fluid, characterized in that the input position (TP) is different. A separation apparatus for grinding sludge contained in the grinding fluid according to claim 4,
Separating device for grinding sludge contained in grinding fluid, characterized in that the charging position (TP) is arranged upstream of the pulling position (HP) in the conveying direction of the magnetic conveyor (6) . A separation device for grinding sludge contained in the grinding fluid according to any one of claims 1 to 5,
An apparatus for separating grinding sludge contained in a grinding fluid, wherein the condensing means (30) is a scraper (30A) for scraping off floating grinding sludge (FS) adhering to the surface of the collecting means (22). A separation device for grinding sludge contained in the grinding fluid according to any one of claims 1 to 6,
An apparatus for separating grinding sludge contained in a grinding fluid, wherein the recovery means (22) is a rotating plate (22A) that rotates about a rotating shaft. A separator for grinding sludge contained in the grinding fluid according to any one of claims 1 to 7, further comprising:
Magnetizing means for forcibly magnetizing the settling grinding sludge (SS) that is settling in the liquid of the grinding liquid L among the grinding sludge,
A grinding fluid characterized in that the settling grinding sludge (SS) magnetized by the magnetizing means is precipitated on the nonmagnetic plate (5) and discharged by the magnetic conveyor (6). Included grinding sludge separation device. A method for separating grinding sludge contained in a grinding fluid,
By immersing at least a part of the recovery means (22) in the grinding fluid (L) and pulling up from the grinding fluid (L), floating grinding sludge (FS) floating on the liquid surface of the grinding fluid (L) is obtained. Adhering to the surface of the recovery means (22);
A step of condensing the grinding sludge attached to the recovery means (22) and once pulled up from the grinding fluid (L);
A step of charging the condensed lump grinding sludge (KS) into the grinding fluid (L) again;
Including
The lump grinding sludge (KS) charged in the grinding fluid (L) is allowed to settle on the non-magnetic plate (5) and adsorbed by the magnetic conveyor (6) disposed on the back surface of the non-magnetic plate (5). A method for separating grinding sludge contained in a grinding fluid, wherein the slurry is discharged together with a non-magnetic substance precipitate (NM) contained in the grinding fluid (L).

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