JP3677371B2 - Liquid purification method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid purification method and apparatus for purifying and reusing liquid mixed with foreign matters such as sludge, which is returned to a tank from a working machine such as a grinding machine and a washing machine.
[0002]
[Prior art]
As a conventional liquid purification apparatus, there is one as disclosed in JP-A-7-213941. This steel strip cleaning liquid purifier includes a first tank for storing a cleaning liquid mixed with iron-containing sludge, a rotatable disk having a magnetic attraction force arranged so that a substantially lower half is immersed in the cleaning liquid, A first scraper that scrapes off the sludge adsorbed on the disc; a second tank that stores the scraped sludge; and a substantially lower half of one roll is immersed in the cleaning liquid of the second tank. And a second scraper that scrapes off the sludge adsorbed on the surface of the one roll. In addition, the delivery pump is provided in the tank, and the liquid sent to the working machine via the delivery side pipe from now on is allowed to flow into the tank from the return side pipe after finishing the work.
[0003]
By adopting such a configuration, among the sludge mixed in the cleaning liquid of the first tank, the one near the disc is continuously separated and collected in the second tank, so that the cleaning liquid of the first tank It is made to reuse while purifying. Since the sludge collected in the second tank contains the cleaning liquid, it is squeezed out by a twin roll device so that only the sludge is collected in the sludge collection container.
[0004]
[Problems to be solved by the invention]
However, in the conventional liquid purification apparatus as described above, sludge is likely to settle at the bottom of the first tank away from the disk arrangement position, and sludge is also likely to adhere to the side wall of the first tank. Not only is it difficult to increase the cleanliness of the entire liquid, but also there is a problem that regular tank cleaning work is required to remove such sludge, and maintenance of the apparatus is troublesome. . In addition, since it is necessary to provide a plurality of tanks, there is another problem that the installation space of the apparatus becomes large.
[0005]
Next, as another conventional liquid purification apparatus, as shown in FIG. 10, a magnetic separator 82 is provided in a tank 80, a centrifugal motor 86 is provided in a centrifuge 84, and centrifugal separation is performed from the tank 80 by a liquid feed pump 88. In some cases, the grinding fluid is sent to the machine 84. A sludge collection container 85 is provided below the centrifuge 84. However, in such a configuration, when the grinding fluid containing a large amount of sludge flows into the tank 80 from the return side pipe 81, it is prevented from being directly sucked into a delivery pump (not shown) and reaches the delivery pump. In order to separate and settle the sludge as much as possible, a large number of partition walls are arranged in the tank 80 in the maze shape so that the flow path between the return side and the delivery side is formed long. In general, the production of the tank 80 is troublesome. Further, even if such a configuration is adopted, the two problems cannot be solved, and when this is applied to a grinding machine using a grindstone, there is a liquid level in the grinding sludge. Since some of them float on the surface, it is difficult to separate and remove the floating sludge in the tank 80 by the magnet separator 82 or the centrifugal separator 84, and a manpower for removing the floating sludge is necessary. There is a problem of becoming.
The present invention aims to solve such a problem.
[0006]
[Means for Solving the Problems]
  The present invention actively stirs the liquid containing foreign matter in the tank to prevent the foreign matter from precipitating on the bottom of the tank or adhering to the tank side wall, and in this state, the foreign matter is separated from the liquid. And the said subject is solved by making it take out out of a tank.
  That is, the liquid purification method of the present invention is the one described in claim 1 that is reused while purifying the liquid mixed with foreign matter such as sludge, which is returned to the tank from a working machine such as a grinding machine or a washing machine. In doing so, the returned liquid is actively stirred in the tank to remove foreign matter.To the bottom of the tankPrecipitationAnd tank side wallA flow that prevents adhesion and leads the foreign matter in the tank to a foreign matter separation area that separates the fluid from the fluid is formed. In this state, the foreign matter is separated from the liquid in the foreign matter separation area and discharged out of the tank.At the same time, the stagnation of foreign matter is eliminated by forcibly and temporarily disturbing the flow of the liquid.It is characterized by that.
  Next, according to a second aspect of the present invention, the stirring of the liquid is performed so as to form the flow toward the bottom surface of the tank.
  Next, according to a third aspect of the present invention, the stirring of the liquid is performed in a tank.~ sideIt is characterized in that it is performed so as to form the circulation-like flow along the wall surface.
  According to a fourth aspect of the present invention, the foreign matter is separated along a vortex on the surface of the liquid formed by the flow of the liquid.
  Moreover, the liquid purification apparatus for implementing the said method is a claim.5The described one includes a tank (10) for storing a liquid mixed with foreign matters such as sludge, which is returned from a working machine such as a grinding machine and a washing machine, and foreign matter separating means (22, 24), and is intended to be reused while purifying the liquid, and actively agitates the liquid in the tank (10)Then, the foreign matter is prevented from settling on the bottom of the tank and adhering to the side wall of the tank, and a flow that leads to the foreign matter separating means in the tank is formed.Stirring means (14, 16, 17, 18, 19)And means for forcibly and temporarily disturbing the flow of the liquid formed by the stirring means;WithRuIt is characterized by that.
  Next, the claim6According to the description, the stirring means includes a stirring pump (14) for pumping up the liquid in the tank (10), and a nozzle (16, 17, 18, 19) for ejecting the liquid from the stirring pump (14). And at least one nozzle (16) of the nozzles (16, 17, 18, 19) is characterized by opening toward the bottom of the tank (10).
  Next, the claim7What is described is that the liquid is a grinding liquid for a grinding machine, and abrasive separation means (abrasive trap 30) having an abrasive pool (30b) is provided on the return side of the grinding liquid. .
  Next, the claim8According to the description, the foreign matter is mainly composed of a magnetic material, and the foreign matter separating means has a magnetic adsorption force, and a disk (22) that rotates while being partially immersed in a liquid in a tank; A scraper (24) for scraping off the foreign matter adsorbed on the disc (22), and liquid squeezing means for squeezing out the liquid adhering to the scraped foreign matter is provided in the vicinity of the disc (22). It is characterized by being.
  Next, the claim9As for the thing of description, the said liquid squeezing means is rotatably supported in the state pressed by the disk surface of the said disk (22), and becomes a large diameter, so that it becomes the outer-diameter side of a disk (22). The taper squeezing roller (40) is made of a material having a conical shape formed in this manner and having a high elasticity.
  Next, the claim10What is described is characterized in that at least one of the nozzles (20) is provided so as to open toward an outer peripheral surface in the vicinity of the top of rotation of the disk (22).
  Next, the claim11In the description, the foreign matter is mainly a non-magnetic material, and the foreign matter separating means is for the filter (50) and the filter (50) for supplying the liquid containing the foreign matter in the tank (10) to the filter (50). And a pump (52).
  In addition, the code | symbol etc. in parenthesis shows the corresponding member of embodiment.
[0007]
[Action]
  As described in claim 1, the liquid returned into the tank is agitated positively to prevent the foreign matter from precipitating on the bottom of the tank and to form a flow that leads to the foreign matter separation area. Isolate foreign matter and discharge it to the outside., By forcibly and temporarily disturbing the flow of liquid,Therefore, the liquid in the tank can be purified more efficiently than in the past, and there is almost no need to clean the inside of the tank, and the maintenance of the apparatus becomes easy. Even sludge that is sticky and difficult to handle, such as sludge mainly composed of iron and steel castings, can be easily washed away by the liquid ejected from the nozzle, so that sludge can be handled easily. In addition, since the processing liquid is kept cleaner than before and foreign matter hardly floats on the liquid surface, it becomes possible to detect the accurate liquid level, so when the liquid level falls below a predetermined level It is possible to install a machining fluid automatic replenishing device configured to automatically replenish the machining fluid, thereby improving the efficiency of maintenance work. In this case, the self-cleaning in which the float for detecting the liquid level is washed with the replenishing processing liquid can be performed, so that the malfunction of the float due to the sludge can be prevented more reliably.
[0008]
  Claim 2 or6As described, by stirring so as to form a flow that directs the liquid toward the bottom surface of the tank, foreign matter is less likely to settle on the bottom surface of the tank, so that the foreign matter can be more effectively separated.
  According to the third aspect, the liquid is agitated so as to form a circulating flow along the side wall surface of the tank, so that the foreign material is less likely to adhere to the tank side wall surface. It becomes possible to do.
[0009]
  As described in claim 4, it is possible to more effectively separate the foreign matter by separating the foreign matter along the vortex of the liquid surface where the foreign matter is likely to gather.
[0010]
  Claim5As described, by actively stirring the liquid in the tank, it is possible to prevent sludge from precipitating at the bottom of the tank, so that the foreign matter can be separated more effectively by the foreign matter separating means.In addition, by forcibly disturbing the liquid flow temporarily, even if a flow in which foreign matter stays in an unspecified place in the tank can be eliminated, it is more effective. Thus, it is possible to separate foreign matter.
  Claim7When configured as described, it is possible to prevent abrasive grains (whetstone waste) that are inconvenient for work from flowing into the tank.
[0011]
  Claim8When configured as described, foreign matter in the liquid can be separated while preventing sludge from precipitating at the bottom of the tank, so that the foreign matter can be separated more effectively by the foreign matter separating means.
  Claim9When constructed as described, sludge mainly composed of magnetic materials other than castings, such as sludge that does not become too sticky even with relatively high moisture, can be handled easily with a cheaper device. Can do.
[0012]
  Claim10When configured as described, especially when a large amount of foreign matter adheres to the outer peripheral surface of the disk, such as when the apparatus is started, the scraper does not cause malfunction due to increased load. The foreign matter on the outer peripheral surface can be washed and dispersed on both side surfaces.
  Claim11When configured as described, foreign matter can be efficiently separated from the liquid even if the sludge is mainly composed of a non-magnetic material.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
1 to 4 show a first embodiment in which the present invention is applied to a tank of a grinding machine (working machine) that uses a grinding liquid. In FIG. 1, a processing pump 12 that supplies a grinding fluid to the grinding machine is provided in a tank 10 that contains a grinding fluid (liquid) mixed with foreign matter such as sludge and returned from a grinding machine (not shown). , A stirring pump 14 for actively stirring the grinding fluid in the tank 10, a plurality of stirring nozzles 16, 17, 18 (see FIG. 2), 19 connected to the stirring pump 14, a washing nozzle 20, a disk 22 having a large number of magnets 92, a magnet roller 26, a rubber squeezing roller 28, and an abrasive trap (abrasive separator) 30 are provided as shown. Agitation means is constituted by the agitation pump 14 and the agitation nozzles 16 to 19. The arrangement of the nozzles 16 to 20 will be described in detail later. The disc 22 is arranged so as to be rotatable by the motor 90 and so that the substantially lower half is immersed in the liquid surface of the grinding fluid. A large number of magnets 92 are embedded in the disk surface of the disk 22. The abrasive trap 30 has a rectangular tube shape, the inlet 30a is connected to the working machine, the discharge port 30c is opened to the tank 10, and the abrasive pool 30b is formed in the middle part thereof. Yes. As shown in FIG. 3, a box-shaped abrasive collection container 31 is fitted in the abrasive pool 30b. The abrasive grain recovery container 31 is provided with a baffle plate 33 with a large number of holes. The grinding liquid containing sludge discharged from the grinding machine passes through the inlet 30a of the abrasive trap 30 and after most of the abrasive grains (whetstone waste) is trapped by the baffle plate 33, the liquid containing sludge is disturbed. It passes through the hole of the plate 33 and is returned to the tank 10 as the discharged liquid from the discharge port 30c.
[0014]
As shown in FIG. 2, a scraper 24 having a “U” -shaped blade surface formed so as to surround the diametrical half of both sides of the disc 22 and the outer peripheral surface is disposed. In this embodiment, the disc 22, the magnet 92, the motor 90 and the scraper 24 constitute foreign matter separating means. As shown in the figure, the scraper 24 is arranged so as to surround approximately １ ／ in the diameter direction of the disk 22. As shown in FIG. 4, the scraper 24 is supported by brackets 27 and 29 described later via a scraper mounting plate 25. While being rotated by the motor 90, the disk 22 adsorbs sludge in the liquid (a mixture of iron powder, fine particles of grinding stone scraps, grinded soot, etc .: foreign matter) by the magnetic force of the magnet 92. . Next, when the disc 22 passes through the scraper 24, the adsorbed sludge is scraped off.
[0015]
The above-mentioned first stirring nozzle 16 is disposed so as to inject the grinding liquid in the tank 10 toward the bottom surface of the tank to form a flow toward the disk 22 described later. Next, the second stirring nozzle 17 directs the discharged liquid containing sludge flowing down from the discharge port 30c of the abrasive trap 30 toward the tank bottom surface, and then guides it to the left end side of the tank side wall surface 10a on the upper side in FIG. That is, it is arrange | positioned so that a waste liquid may be kept away from both pumps 12 and 14. FIG. Further, the third stirring nozzle 18 is disposed so as to prevent the discharged liquid from directly flowing into the processing pump 12 and to form a flow from the tank bottom surface toward the disk 22. Next, the fourth stirring nozzle 19 is arranged at a position where a flow toward the disc 22 is formed so that the discharged liquid does not approach the stirring pump 14. The flushing nozzle 20 is disposed so as to open toward the outer peripheral surface near the top of the rotation of the disk 22. This flushing nozzle 20 prevents the scraper 24 from malfunctioning due to overload even when a large amount of foreign matter adheres to the outer peripheral surface of the disc 22 as at the start of the apparatus. Therefore, it is provided for the purpose of washing out the foreign matter adhering to the outer peripheral surface of the disc 22 on both side surfaces, but when the generated sludge has a large adhesive force as in the case of a steel casting, It is also for facilitating scraping off with a scraper by positively washing away foreign matter adhering to the outer peripheral surface of the disc 22.
[0016]
The magnet roller 26 and the squeezing roller 28 are disposed adjacent to the disc 22. As shown in FIG. 4, the magnet roller 26 and the squeezing roller 28 are rotatably supported by the pair of brackets 27 and 29 described above, and are arranged so that their cylindrical surfaces are pressed with a predetermined pressing force. Yes. A motor 94 is attached to the bracket 27, and a gear 96 is attached to the drive shaft thereof. A gear 98 is attached to the magnet roller 26. A chain 100 is stretched between the two gears 96 and 98. By driving the motor 94, the magnet roller 26 is rotated through the gear 96, the chain 100, and the gear 98, and the aperture roller 28 is driven to rotate. In this embodiment, the magnet roller 26, the squeezing roller 28 and the motor 94 constitute liquid squeezing means. The sludge scraped off from the disk 22 by the scraper 24 contains discharged liquid, but the discharged liquid is squeezed out when passing between the magnet roller 26 and the squeezing roller 28, and only the sludge is adsorbed to the magnet roller 26. The discharged liquid thus squeezed out returns to the tank 10 via a return passage (not shown). A shooter 32 is arranged so that one end side contacts the cylindrical surface of the magnet roller 26. A blade edge 32a is formed on one end side. That is, the shooter 32 has a function as a scraper. A sludge collection box 34 is provided below the shooter 32 (see FIG. 2. Note that in FIG. 1, the sludge collection box 34 is omitted to show the inside of the tank 10). The sludge adsorbed on the magnet roller 26 is scraped off by the cutting edge 32a of the shooter 32 as the magnet roller 26 rotates, and falls along the inclined surface 32b and can be stored in the sludge collection box 34.
[0017]
Next, the operation of the first embodiment will be described. The grinding liquid in the tank 10 is supplied from a machining pump 12 to a grinding machine (not shown) to perform a grinding operation. After finishing the work, the grinding fluid containing the sludge discharged from the grinding machine passes through the inlet 30a of the abrasive trap 30 and grindstone scraps of a predetermined size or larger are trapped in the abrasive pool 30b. The liquid is returned to the tank 10 from the discharge port 30c as a discharge liquid together with the sludge. The direction of the flow of the discharged liquid is controlled by the second stirring nozzle 17 so as to be directed toward the left end of the upper tank side wall 10a in FIG. At the same time, the first stirring nozzle 16 injects the grinding liquid in the tank 10 toward the bottom surface of the tank to form a flow toward the disc 22. At this time, a part of the liquid discharged from the discharge port 30c (which could not be controlled by the second stirring nozzle 17) directly flows into the processing pump 12, but by the third stirring nozzle 18, Inflow is prevented and the direction of the flow is changed from the bottom of the tank toward the disc 22. The overall action of these nozzles 16 to 19 prevents sludge from accumulating on the bottom of the tank while preventing the discharged liquid discharged into the tank 10 from being directly sucked into the pumps 12 and 14. At the same time, the grinding fluid is controlled to be a circulating flow along the tank sidewall as a whole. Therefore, the discharged liquid that has flowed down from the discharge port 30c finally gathers in the vicinity of the disk 22 without any sludge being settled, and the sludge in the discharged liquid is efficiently adsorbed by the disk 22. . The adsorbed sludge is scraped off from the disc 22 when passing through the scraper 24. The scraped sludge contains liquid, but the liquid is squeezed out while passing between the magnet roller 26 and the squeezing roller 28, and only the sludge adheres to the magnet roller 26. Next, the sludge is scraped off from the magnet roller 26 by the cutting edge 32a of the shooter 32, falls along the inclined surface 32b, and is stored in the sludge collection box 34. In this way, the grinding stone waste is stored in the abrasive collection container 31 of the abrasive trap 30. However, the abrasive collection container 31 may be periodically taken out from the abrasive trap 30 to collect and discard the grinding stone.
[0018]
Even if the direction of each of the stirring nozzles 16 to 19 and the ejection flow rate are set so that a flow toward the disc 22 is formed, the flow state changes due to the movement of the floating sludge and the like. Some foreign matter may stay in a specific location. In such a case, for example, the liquid ejected from each of the stirring nozzles 16 to 19 is temporarily stopped, and then the liquid ejection is resumed. It becomes easy to return to the flow state, and it becomes possible to eliminate the retention of foreign matters. Therefore, in the pipe line connecting the stirring pump 14 and each of the stirring nozzles 16 to 19, a “means for temporarily disturbing the flow state” such as a solenoid valve and a timer is added to the apparatus. It is good to provide it.
[0019]
The flow of the liquid purification process described above is shown in FIG. The grinding fluid containing the sludge generated by the grinding operation is discharged from the grinding machine and guided to the abrasive trap 30 (step 200). Here, only the large grindstone waste is stored in the abrasive collection container 31 (step 202), and the remaining one is returned to the tank 10 as a discharged liquid so that the sludge is not precipitated by the stirring pump 14 and the stirring nozzles 16-19. Then, the mixture is stirred so as not to adhere to the tank wall surface (step 204). Further, the flow of the discharged liquid is controlled so as to go to the disk 22 in which the magnet 92 is embedded, and the sludge is adsorbed to the disk 22 (step 206). Next, the sludge on the disk 22 is scraped off by the scraper 24 while containing a certain amount of liquid (step 208). The sludge and liquid are separated by the magnet roller 26 and the squeezing roller 28, respectively (step 210). That is, the liquid is squeezed out by the squeezing roller 28 and returned to the tank 10, and only the sludge is adsorbed by the magnet roller 26. Next, sludge on the magnet roller 26 is scraped off by the shooter 32 having a scraper action, and dropped along the inclined surface 32b (step 212). The dropped sludge is stored in the sludge collection box 34 (step 214).
The configuration of the first embodiment is suitable for a material in which the material to be ground has an increased adhesiveness when the generated sludge contains moisture, such as a steel casting. is there.
[0020]
(Test results)
A comparative test was performed by actual grinding using the conventional liquid purification apparatus having the configuration shown in FIG. 10 and the liquid purification apparatus having the configuration of the present invention shown in FIG.
In the conventional type, sludge discharged to the outside and the same amount of sludge settled at the bottom of the tank together with the grinding stone waste, and a large amount of foamy sludge floated on the liquid level. It had to be cleaned regularly to remove it. Also, when grinding steel castings, sludge containing moisture may stick to the shooter and the like, preventing discharge, and it is necessary to check and clean the sludge discharge part.
[0021]
On the other hand, in the present invention, almost twice as much sludge as the conventional one is discharged to the sludge collection box 34, and sludge and grinding stone waste are hardly precipitated on the bottom surface of the tank 10, so that the grinding liquid It was confirmed that the overall cleanliness was significantly improved compared to the conventional one. In addition, since the sludge after passing through the squeezing roller 28 contains almost no moisture, the sludge does not stick to the shooter (sludge discharge portion) 32, and the sludge inspection and cleaning work is almost unnecessary. It was in a state. In addition, it was recognized that the processing accuracy of the grinding surface of the material to be ground is the same as or better than the conventional one. This is considered to be related to the improvement in the cleanliness of the whole grinding fluid.
[0022]
(Second Embodiment)
  Next, a structure suitable for the case where the material to be ground is a material that does not become very sticky even if the sludge to be generated contains moisture, such as a steel material other than a casting, will be described below.
  6 and 7 show a second embodiment of the present invention (claims).9Corresponding to). In the first embodiment, the liquid squeezing means is composed of a magnet roller, a squeezing roller, and a motor, and a shooter having a scraper function is provided on the squeezing roller. In addition, a taper squeezing roller made of a highly elastic material is provided so that the conical surface is pressed against and contacted with the side surface of the disc, and this and the side surface portion of the disc constitute a liquid squeezing means and a scraper. It is designed to function as a shooter.
[0023]
That is, a pair of brackets 110 are provided on the upper portion of the tank 10, and a rubber taper squeezing roller 40 is rotatably supported by the brackets 110. The tapered surface of the taper squeezing roller 40 is formed to have a larger diameter toward the outer diameter side of the disk 22. Further, the position of the bracket 110 is set so that the conical surface of the taper squeezing roller 40 is pressed against the disc surface of the disc 22. As shown in FIG. 7, the taper squeezing roller 40 and the pair of brackets 110 are provided on both sides of the disc 22, respectively. Further, the right end of the scraper 42 arranged so as to sandwich the outer surface of the disk 22 in a “U” shape extends in an inclined surface shape to the outside of the tank 10, and the inclined surface 42 a It is designed to serve as a shooter. A sludge collection box 34 is provided below the inclined surface 42 a of the scraper 42. Since other configurations are the same as those of the first embodiment, description thereof will be omitted.
[0024]
Next, the operation of the second embodiment will be described. In this embodiment, it is used when processing a steel material other than casting as a material to be ground. The grinding liquid containing the sludge discharged from the grinding machine is trapped in the abrasive trap 30 by grinding stone scraps of a predetermined size or larger, and then the remaining liquid is returned to the tank 10 together with the sludge as discharged liquid. The discharged liquid becomes a flow toward the disk 22, and sludge contained in the liquid is efficiently adsorbed by the magnet 92 of the disk 22. The liquid adhering to the sludge passes between the disk surface of the disk 22 and the taper squeeze roller 40, so that most of the liquid is squeezed out and the sludge containing almost no moisture is adsorbed by the disk 22. Then, the scraper 42 reaches the scraper 42, is scraped off from the disc 22, falls along the inclined surface 42a, and is stored in the sludge collection box 34. At this time, since the material to be ground is a steel material other than casting, even if the sludge contains some moisture, the adhesive force does not increase so much, so there is almost no sticking to the inclined surface 42a of the scraper 42. It will fall into the collection box 34.
[0025]
In the second embodiment, since the taper squeezing roller 40 and the bracket 110 may be provided as the liquid squeezing means, it is not necessary to provide an expensive magnet roller. Further, since the taper squeezing roller 40 is forcibly rotated by the rotational force of the disk 22, it is not necessary to provide a motor for driving the taper squeezing roller 40. Therefore, the price of the apparatus can be considerably reduced as compared with that of the first embodiment.
[0026]
  FIG. 8 shows a third embodiment of the present invention suitable for a case where the workpiece is a non-magnetic material such as brass (claim).11Is a hydraulic circuit diagram of the washing machine. Into the tank 10, a cleaning liquid containing cleaning foreign substances returned from a processing pump 12, a stirring pump 14, and a cleaning machine (not shown) for supplying a cleaning liquid (processing liquid) to the workpiece flows into the tank 10. In addition to the provision of the return line 15 and the stirring nozzle 19, the filter 50 for separating foreign substances from the cleaning liquid and the filter for supplying the cleaning liquid in the tank 10 to the cleaning liquid as foreign substance separating means. A pump 52 is provided. Although not shown in the drawings, it is preferable to use a disk-shaped (but not require a magnet) sludge removing device similar to the first embodiment so that floating sludge can be separated and removed.
[0027]
In the third embodiment, the cleaning liquid is supplied to the workpiece from the processing pump 12, while the cleaning liquid in the tank 10 is stirred by the stirring pump 14 and the stirring nozzle 19, and the return pipe The cleaning liquid containing the foreign matter returned from 15 into the tank 10 is supplied from the filter pump 52 to the filter 50. Foreign matter in the cleaning liquid is filtered by the filter 50, and the cleaned cleaning liquid is returned to the tank 10. The filter elements in the filter 50 are periodically replaced. Thereby, even if the foreign matter such as sludge does not have magnetism, the foreign matter can be separated from the cleaning liquid while preventing the precipitation of the foreign matter, and the cleaning liquid can be effectively purified.
[0028]
Although it is conceivable to provide a filter in the return pipe 15 as the foreign matter separating means, it is not so suitable because problems such as overflow of the return cleaning liquid due to clogging are likely to occur.
[0029]
FIG. 9 is a conceptual diagram of a machining fluid automatic replenishing device used in combination with the apparatus of the present invention. A float 60 is provided so as to float on the liquid level of the machining liquid, and a lower limit liquid level detector 62 and an upper limit liquid level detector 64 are provided so as to correspond to the piston portion 60a at the upper part of the float 60 in the drawing. Yes. The machining liquid replenishment valve 66 is configured to be opened by a signal from the lower limit liquid level detector 62 and to be closed by a signal from the upper limit liquid level detector 64. A pipe 68 on the left side of the machining liquid replenishing valve 66 in the drawing is connected to a machining liquid replenishing tank (not shown), and a pipe 70 on the right side in the figure opens above the float 60 as shown in the figure. Is arranged.
[0030]
The float 60, the lower limit liquid level detector 62, and the upper limit liquid level detector 64 detect the liquid level as is well known, and when a signal is output from the lower limit liquid level detector 62, a valve for replenishing the machining liquid. 66 is opened, and the machining fluid is replenished from the machining fluid replenishing tank to the tank 10 through the piping 68, the machining fluid supplementing valve 66, and the piping 70. At this time, foreign matters such as sludge adhering to the float 60 are washed away by the replenished processing liquid, so that self-cleaning becomes possible. When a signal is output from the upper limit liquid level detector 64, the machining liquid replenishing valve 66 is closed and the machining liquid from the machining liquid replenishing tank is shut off. Such an automatic processing liquid replenishment device can be used for reliable liquid level detection and stable automatic replenishment of the processing liquid when used in combination with the liquid purification device as in the present invention. It is.
[0031]
In the description of each of the above embodiments, the squeezing roller is made of rubber. However, the squeezing roller may be made of a material having high elasticity, and the squeezing roller may be made of rubber plastic. You can also.
In the description of each of the above embodiments, the processing pump, the agitation pump, and the like are provided separately. However, using one pump, the discharge pipe is divided into two or three, and the processing is performed. It is also possible to supply liquid for use and stirring, or for processing, stirring and filtering.
[0032]
Furthermore, in the description of each of the above embodiments, the tank 10 has a rectangular box shape, but may have a bottomed cylindrical shape. As a result, the flow of the liquid becomes smoother, and foreign substances can be more easily collected at the sludge separation site.
In the first embodiment, the disk rotating motor and the magnet roller rotating motor are separately provided. However, the disk and the magnet roller are rotated by one motor, respectively. It can also be configured as follows.
[0033]
In the description of the first embodiment, the present invention is applied to a grinding machine using a grindstone, and the abrasive grains trapped in the abrasive trap 30 are discarded. The present invention can be applied to a multi-blade cutting machine using a grinding fluid containing grains. In this case, the abrasive grains trapped in the abrasive trap 30 can be reused.
[0034]
【The invention's effect】
  As described above, according to the present invention, the liquid returned to the tank is positively stirred to prevent the foreign matter from precipitating on the tank bottom and adhering to the tank side wall, and leading the liquid to the foreign matter separation area. In this way, the foreign matter contained in the liquid is separated and discharged to the outside.In addition, the liquid flow is forcibly and temporarily disturbed so that it can be resolved even if a flow in which foreign matter stays in an unspecified place in the tank is generated.Therefore, the liquid in the tank can be purified more efficiently than in the past, and there is almost no need to clean the inside of the tank, and the maintenance of the apparatus becomes easy. Even sludge that is highly sticky and difficult to handle, such as sludge mainly composed of steel casting, can be easily scraped off by the liquid sprayed from the nozzle, so that the sludge can be handled easily. Also, since the machining fluid is kept cleaner than before and foreign matter hardly floats on the liquid surface, it becomes possible to detect the accurate liquid level, so when the liquid level falls below a predetermined level It is possible to install a machining fluid automatic replenishing device configured to automatically replenish the machining fluid, thereby improving the efficiency of maintenance work. In this case, since the self-cleaning in which the float for detecting the liquid level is washed with the replenishing processing liquid is possible, the malfunction of the float due to the sludge can be prevented more reliably.
[0035]
  Claim 2 or6When configured as described, foreign matters are less likely to settle on the bottom surface of the tank, so that foreign matters can be more effectively separated.
  According to the third aspect of the present invention, the foreign matter is less likely to adhere to the tank side wall surface, so that the foreign matter can be more effectively separated.
  When configured as described in claim 4, since the flow reaches every corner of the foreign matter separation area, the foreign matter can be separated more effectively.
[0036]
  Claim5If configured as described,By forcing the liquid flow to be temporarily disturbed,Since it is possible to prevent the sludge from precipitating at the bottom of the tank, the foreign matter can be separated more effectively by the foreign matter separating means.
  Claim7When configured as described, it is possible to prevent abrasive grains (whetstone waste) that are inconvenient for work from flowing into the tank.
  Claim8When configured as described, sludge can be handled easily even if it is highly sticky and difficult to handle, such as sludge mainly composed of steel castings.
  Claim9When constructed as described, sludge mainly composed of magnetic materials other than castings, such as sludge that does not become too sticky even with relatively high moisture, can be handled easily with a cheaper device. Can do.
[0037]
  Claim10When configured as described, especially when a large amount of foreign matter adheres to the outer peripheral surface of the disk, such as when the apparatus is started up, a malfunction due to an increase in the load of the scraper is not caused. The foreign matter on the outer peripheral surface can be washed and dispersed on both side surfaces.
  Claim11When configured as described, foreign matter can be efficiently separated from the liquid even if the sludge is mainly composed of a non-magnetic material.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing a first embodiment of the present invention.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is a perspective view showing the structure of an abrasive trap.
FIG. 4 is a partial perspective view around the scraper.
FIG. 5 is a flow diagram of liquid purification processing when the present invention is applied to a grinding machine.
FIG. 6 is an overall perspective view showing a second embodiment of the present invention.
7 is a plan view of FIG. 6. FIG.
FIG. 8 is a hydraulic circuit diagram showing a third embodiment of the present invention.
FIG. 9 is a conceptual diagram showing an example of a machining liquid automatic replenishing device used in combination with the device of the present invention.
FIG. 10 is a perspective view showing an example of a conventional liquid purification apparatus.
[Explanation of symbols]
10 tanks
12 Processing pump
14 Stirring pump (stirring means)
16, 17, 18, 19 Nozzle for stirring (stirring means)
20 Nozzle for flushing
22 disc (foreign matter separating means)
24 Scraper (Foreign matter separation means)
26 Magnet roller (liquid squeezing means)
27 Bracket
28 Squeezing roller (liquid squeezing means)
29 Bracket
30 Abrasive trap (Abrasive separator)
30b Abrasive grain pool
31 Abrasive recovery container
32 Shuta
32a cutting edge
32b inclined surface
34 Sludge collection box
40 Taper squeezing roller (liquid squeezing means)
50 filters
52 Filter pump
90, 94 motor
92 Magnet
110 Bracket

Claims (11)

  When purifying the liquid mixed with foreign matter such as sludge that is returned to the tank from a working machine such as a grinding machine or washing machine, the returned liquid is actively stirred in the tank. In this state, the foreign matter is prevented from settling to the bottom of the tank and adhering to the side wall of the tank, and a flow that leads the foreign matter in the tank to the foreign matter separation area for separating the fluid from the fluid is formed. A liquid purification method characterized in that foreign matter is separated from the liquid and discharged out of the tank, and the flow of the liquid is forcibly and temporarily disturbed to eliminate the retention of the foreign matter.   The liquid purification method according to claim 1, wherein the agitation of the liquid is performed so as to form the flow toward the bottom surface of the tank.   The liquid purifying method according to claim 1 or 2, wherein the liquid is stirred so as to form the circulating flow along the side wall surface of the tank.   4. The liquid purification method according to claim 1, wherein the separation of the foreign matter is performed along a vortex on the surface of the liquid formed by the flow of the liquid. A tank for storing a liquid mixed with foreign matter such as sludge, which is returned from a working machine such as a grinding machine or a washing machine, and a foreign matter separating means for separating the foreign matter from the liquid are provided. In the liquid purification device to be used,
Stirring means that actively stirs the liquid in the tank to prevent precipitation of foreign matter on the tank bottom and adhesion to the tank side wall and to form a flow that leads to the foreign matter separation means in the tank;
Means for forcibly and temporarily disturbing the flow of the liquid formed by the stirring means, and a liquid purification apparatus comprising: The stirring means has a stirring pump for pumping up the liquid in the tank, and a nozzle for ejecting the liquid from the stirring pump,
6. The liquid purification apparatus according to claim 5, wherein at least one of the nozzles opens toward the bottom of the tank.   The liquid purifier according to claim 5 or 6, wherein the liquid is a grinding liquid for a grinding machine, and an abrasive grain separation means having an abrasive grain pool is provided on the return side of the grinding liquid. The foreign matter is mainly composed of a magnetic material, and the foreign matter separating means has a magnetic attraction force, a part of which rotates while being immersed in the liquid in the tank, and the foreign matter adsorbed on the disc. A scraper for scraping off
8. The liquid purifying apparatus according to claim 5, wherein liquid squeezing means for squeezing out liquid adhering to the scraped foreign matter is provided in the vicinity of the disc.   The liquid squeezing means is rotatably supported in a state of being pressed against the disk surface of the disk, and has a conical shaft shape formed so as to increase in diameter toward the outer diameter side of the disk. 9. The liquid purifier according to claim 8, further comprising a taper squeezing roller made of a material having high elasticity.   10. The liquid purification apparatus according to claim 8, wherein at least one of the nozzles is provided so as to open toward an outer peripheral surface in the vicinity of a vertex of rotation of the disk.   The foreign matter is mainly composed of a non-magnetic material, and the foreign matter separating means includes a filter and a filter pump for supplying a liquid containing the foreign matter in the tank to the filter. The liquid purification apparatus according to 6 or 7.

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