JP2006035089A - Filtration apparatus for circulating cooling water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the shutdown time of a filtration apparatus for circulating cooling water due to replacement of a filter etc. to prevent lowering in productivity as a result by restraining the clogging of the filter thereby maintaining the filtering function for a long period of time. <P>SOLUTION: The filtration apparatus is constituted in such a way that the filtration surface of a communicating and freely windable belt-like filter medium 4 having a spare rolled filter medium part which is not immersed in circulating cooling water is immersed in the circulating cooling water stored in a water storage tank 2 and the communication part is connected to a pump 3 for sucking the stored circulating cooling water. Since the stored circulating cooling water is sucked by the pump 3 through the belt-like filter medium 4, scale is not contained in the circulating cooling water flowing in a metallic mold 1 and scale is not stuck to/accumulated in a cooling water hole of the metallic die 1, so that the narrowness or blockade of the cooling water hole owing to the exfoliation of scale can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a circulating cooling water filtering device for filtering circulating cooling water used for cooling die casting molds, plastic molding dies, and the like.

  In a mold cooling device that cools a mold by flowing cooling water through a cooling water hole formed in the mold, a scale is deposited and deposited on the inner surface of the cooling water hole of the mold over time. If the scale deposits or accumulates in the cooling water hole, there is a problem that the cooling effect of the mold is reduced.In addition, if the deposited and accumulated scale peels from the inner surface of the cooling water hole, the mold is clogged in the cooling water hole. There was a problem of losing the cooling function. Therefore, there is a filter installed in the cooling water chamber from the inlet of the manifold main body in order to remove impurities contained in the cooling water (see, for example, Patent Document 1).

However, since it is installed from the inlet of the manifold main body to the cooling water chamber, there is a problem that the filter capacity is small and the filter is clogged in a short period of time and the cooling function of the mold is lowered. For this reason, it was necessary to change the filter frequently to maintain the cooling function. However, since the manifold body is provided with a filter, the apparatus must be stopped while the filter is replaced, resulting in a problem that the operating rate of the apparatus is lowered and productivity is deteriorated.
JP 2001-18050 A.

  The problem to be solved is to suppress clogging, maintain the filtration function for a long period of time, shorten the apparatus stop time associated with filter replacement, etc., and eliminate the decrease in productivity.

  The present invention immerses the filtration surface of a freely wound strip-shaped filter medium having a roll-shaped prefiltration section that is not immersed in the circulating cooling water in the circulating cooling water stored in a water storage tank, and communicates the strip-shaped filter medium. A circulating cooling water filtering device in which a pump for sucking the circulating cooling water is connected to one end of the unit is defined as the invention of claim 1, and in the invention of claim 1, the circulating cooling water filtering device provided with a reverse cleaning mechanism for the belt-shaped filter material is claimed. According to a second aspect of the present invention, in the second aspect of the present invention, the back cooling mechanism is a circulating cooling filter device comprising a compressed air supply pipe for blowing air into the communicating portion of the band-shaped filter medium. A circulating cooling filter device comprising a pump for injecting cleaning water into the communication part of the material, a pressing mechanism for closing the communication part of the band-shaped filter medium, and a reverse winding mechanism for the band-shaped filter medium is defined as the invention of claim 4, 1 to 4 In the present invention, the circulating cooling water filtering device in which a band-shaped filter material is provided with a water-permeable shape retaining member is the invention of claim 5, and in the inventions of claims 1 to 5, the circulating cooling water is used for cooling the mold. The water filtration device is the invention of claim 6.

The present invention is to immerse the filtration surface of a roll-shaped continuous filter medium having a roll-shaped pre-filtration portion that is not immersed in the circulating cooling water in the circulating cooling water stored in a water storage tank, and to communicate the strip-shaped filter medium. By connecting a pump that sucks up the circulating cooling water to one end of the unit, if the band-shaped filter material becomes clogged, the clogged filtration surface is wound up and a new filtration surface of the roll-shaped prefiltration unit is drawn out to circulate and cool. If immersed in water, the filtration function can be recovered immediately. Since the recovery operation of such a filtration function can be performed until the roll-shaped preliminary filtration unit is eliminated, the replacement time of the band-shaped filter medium can be greatly extended, and the stop time of the apparatus accompanying the replacement of the band-shaped filter medium is As a result, the operating rate of the apparatus increases and productivity can be improved.
According to the second aspect of the present invention, the clogged band-shaped filter medium can be regenerated by providing the band-shaped filter medium with a reverse cleaning mechanism. Since the material can be used for a longer period of time, the operating rate of the apparatus is further increased and the productivity can be further improved.
As in claim 5, by providing a water-permeable shape retaining member to the band-shaped filter medium, it is possible to use generally used inexpensive paper or cloth filter medium, so that the running cost is reduced. It can be reduced.

Next, the present invention will be described in detail based on the filtration device for circulating cooling water for mold cooling shown in FIGS.
In FIG. 1, 1 is a die casting mold, 2 is a circulating cooling water reservoir, 3 is a pump for pumping circulating cooling water, 4 is a continuous filter medium for filtering circulating cooling water, and 5 is a band filtering. A winding mechanism 6 for the material 4 and a reverse cleaning mechanism 6 for removing clogging of the band-shaped filter material 4.

  A return pipe connection for connecting a water supply pipe connection port for connecting the water supply pipe 10 connected to the discharge port of the pump 3 to the mold 1 and a return pipe 11 for returning the cooling circulating water after the mold cooling to the water storage tank 2. An opening and a cooling water hole for cooling the mold are provided.

  In addition, the water storage tank 2 cools the mold 1 and mixes the hot circulating cooling water returned with the stored cold water to lower the temperature and cool it by natural cooling.

  The pump 3 pumps the circulating cooling water in the water storage tank 2 through a continuous band-shaped filter material 4. The circulating cooling water pumped up by the pump 3 is introduced into the cooling water hole of the mold 1 through the water supply pipe 10. The The circulating cooling water supplied to the cooling water hole of the mold 1 circulates through the cooling water hole of the mold 1, is discharged from the return pipe connection port of the mold 1, and is returned to the water storage tank 2 through the return pipe 11.

  The strip-shaped filter medium 4 communicated is made of a filter medium formed in the shape of a paper or cloth tube, and filters the contaminants of about 20 μm. The strip-shaped filter medium 4 is a roll that is not immersed in the circulating cooling water. A pre-filtration part is formed at one end and the other end is taken up as a winding part, and the band-shaped filter medium 4 having a reduced filtration function is taken up around the winding part. The winding portion of the band-shaped filter material 4 is provided with a connection port 20a that can be connected to the pump 3 at one end, and a tube body 20 in which a slit connecting the end portion of the band-shaped filter material 4 is formed, and the tube body 20 is wound and rotated. It consists of a winding mechanism 5. Reference numeral 12 denotes a water-retaining shape-providing member provided on the band-shaped filter material 4. The shape-retaining member 12 is assumed to contain a strong mesh-like material in the communicating portion, and the pump 3 is driven to cause the band-shaped filtration. When suction pressure is applied to the communication part of the material 4, the communication part is crushed and the upper and lower filtration membranes are brought into close contact with each other to prevent losing the filtration function. Of course, the shape-retaining member 12 is not necessary if it is made of a material having a strength sufficient to withstand. The shape-retaining member 12 is housed in the band-shaped filter material 4 as a sponge-like material having water permeability. However, an elastic frame-like material is attached to the inside or provided integrally with the filter membrane. Of course, it may be possible.

  Further, the reverse cleaning mechanism 6 is for blowing compressed air toward the communicating portion of the band-shaped filter material 4 to blow off the scale and the like adhering to the filtration surface to restore the filtration function. Compressed air blown from the reverse cleaning mechanism 6 is blown through a compressed air supply pipe 15 connected to a water supply pipe 10 connected to the pump 3, and is performed while the pump 3 is not cooled without cooling the mold. It is supposed to be. Of course, the pump 3 may be rotated in reverse instead of the compressed air to introduce a water flow in the reverse direction into the communicating portion of the band-shaped filter member 4 to remove clogging. Reference numeral 30 denotes a guide roller that changes the direction of the band-shaped filter member 4.

  In the case of die-casting, the pump configured as described above is operated to suck up the circulating cooling water from the water storage tank 2 and supply it to the mold 1 through the water supply pipe 10. The circulating cooling water flows into the cooling water hole formed in the mold 1 and cools the mold 1. Then, the circulating cooling water that has cooled the mold 1 is returned to the water storage tank 2 through the return pipe 11.

  In this way, the circulating cooling water is circulated between the mold 1 and the water storage tank 2, but the suction port of the pump 3 is connected to the connection port 20 a of the tubular body 20 to which the end of the continuous band-shaped filter material 4 is connected. Since the pump 3 is connected, the suction pressure of the pump 3 is applied to the communication part of the band-shaped filter medium 4, and the circulating cooling water in the water storage tank 2 is sucked into the communication part through the band-shaped filter medium 4. Contaminants are filtered by the belt-like filter material 4.

  Circulating cooling water that is filtered and free from contaminants such as scales is introduced into the cooling water holes of the mold 1 in this way, so that scales and the like are not deposited or accumulated in the cooling water holes. Does not peel off and narrow or block the cooling water hole.

  By repeating such filtration, a scale or the like adheres to the band-shaped filter material 4 immersed in the circulating cooling water, and the filtration function decreases. If the reduction of the filtration function exceeds an allowable value, the reverse cleaning mechanism 6 is operated when the pump 3 is stopped, and the scales and other contaminants adhering to the filtration surface of the band-shaped filter medium 4 are removed by compressed air. The filter medium 4 is regenerated.

  The removal by compressed air is performed by sending compressed air from the compressed air supply pipe 15 connected to the water supply pipe 10 to the communicating portion of the band-shaped filter medium 4 that communicates, and the scales and the like adhering to the surface of the band-shaped filter medium 4. This is done by peeling off the object. By performing such reverse cleaning, the filtering function of the band-shaped filter medium 4 is restored.

  Further, when backwashing by the repeated backwashing mechanism 6 is performed, clogging is not improved, and when the filtration efficiency is reduced, the winding mechanism 5 is driven to rotate the tube body 20 to rotate the filtration surface of the band-shaped filter material 4. Is wound around the tubular body 20, a new spare filtration surface is drawn out from the roll-shaped preliminary filtration unit and immersed in the circulating cooling water, and the filtration is performed by the new strip-shaped filter material 4. Further, the length of the band-shaped filter medium 4 wound around the tube body 20 does not need to wind up the entire filtration surface immersed in the circulating cooling water. This is because a larger suction pressure is applied to the filtration surface closer to the tube body 20, and the suction pressure applied to the filtration surface is smaller as the distance from the tube body 20 is smaller. It is because it has a sufficient filtration function.

  In addition, since the water-permeable shape retaining member 12 is provided in the belt-shaped filter member 4, the communication portion is also used when the belt-shaped filter material 4 is wound up even if the suction pressure of the pump 3 or the water pressure of the circulating cooling water is received. Since it is not crushed, the suction pressure of the pump 3 is stretched in the circulating cooling water through the communication portion and is transmitted to the filtration surface immersed therein.

  Furthermore, since the filtration surface wound around the tube body 20 is clogged and wound, the suction of the circulating cooling water hardly occurs, so the suction pressure is extended into the circulating cooling water and immersed. Therefore, the filtration capacity is stable regardless of the amount of winding.

  FIG. 5 shows another embodiment of the reverse cleaning mechanism 6, which includes a pump 3 that can rotate forward and backward, a pressing mechanism 26 that includes a pair of upper and lower rollers for closing the communication portion of the belt-like filter material 4, and Accordingly, a restraining roller 27 that prevents the belt-like filter material 4 from bulging and a reverse winding mechanism 28 that reversely rotates at a high speed are provided in the attachment portion of the roll-shaped preliminary filtration portion. The pump 3 is rotated forward when the mold 1 is cooled to supply the circulating cooling water in the water storage tank 2 into the mold 1. When the mold 1 is not cooled, the pump 3 is reversed to form a belt-like shape. Circulating cooling water for cleaning is injected into the communicating portion of the filter medium 4. Reference numeral 5 denotes a winding mechanism for winding the band-shaped filter medium 4 having a reduced filtration function. The band-shaped filter medium 4 can be wound and rewound by the winding mechanism 5 and the reverse winding mechanism 28.

  When the band-shaped filter medium 4 is clogged, the back cleaning mechanism 6 operates the pressing mechanism 26 to press the pair of upper and lower rollers and closes the communicating portion of the band-shaped filter medium 4. The pump 3 is rotated in the reverse direction with the communicating portion closed, and the circulating cooling water of the water storage tank 2 is injected into the communicating portion of the band-shaped filter medium 4 and the reverse winding provided at the attachment portion of the roll-shaped prefiltration portion. If the belt-like filter material 4 is rapidly rewound by rotating the mechanism 28 reversely at high speed, the water in the belt-like filter material 4 whose communication portion is blocked by the roller of the pressing mechanism 26 tends to flow out from the filtration surface. Since the filter surface is fine, it cannot flow out rapidly, and the water in the band-shaped filter medium 4 has a high pressure. Since the high-pressure water removes the dust clogged in the band-shaped filter medium 4 accurately and returns it to the water storage tank 2, the band-shaped filter medium 4 is regenerated. When the reverse cleaning is completed in this way, the circulating cooling water in the water storage tank 2 is discarded and replaced with new water.

  Such backwashing with high-pressure water enables repeated regeneration of the band-shaped filter medium 4, so that the period of use can be greatly extended. In the above-described reverse cleaning mechanism 6, the pump 3 can be rotated forward and backward so that it can be used for cooling the mold 1 and for reverse cleaning of the belt-like filter material 4. Of course, a separate pump may be provided to inject the cleaning water into the communicating portion of the band-shaped filter medium 4.

It is the schematic which shows preferable embodiment of this invention. It is a partially notched top view which shows the strip | belt-shaped filter material used for preferable embodiment of this invention. It is a partially cutaway side view. It is a partially notched side view which shows the state which wound up the strip | belt-shaped filter material used for preferable embodiment of this invention. It is the schematic which shows preferable embodiment of this invention using the other Example of the back washing | cleaning mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Water tank 3 Pump 4 Communicating strip-shaped filter medium 5 Winding mechanism 6 Back washing mechanism
12 Shape retaining material
15 Compressed air supply pipe
26 Pressing mechanism
28 Reverse winding mechanism

Claims (6)

  The filter surface of the roll-shaped filter medium that can be rolled up and having a roll-shaped pre-filter that is not immersed in the circulating cooling water is immersed in the circulating cooling water stored in the water storage tank, and is circulated to one end of the communication section of the band-shaped filter medium A circulating cooling water filtration device, wherein a pump for sucking cooling water is connected.   The circulating cooling water filtering device according to claim 1, further comprising a reverse cleaning mechanism for the band-shaped filter medium.   The circulating cooling and filtering apparatus according to claim 2, wherein the reverse cleaning mechanism includes a compressed air supply pipe that blows air into the communicating portion of the belt-shaped filter medium.   3. The reverse cleaning mechanism comprises a pump for injecting cleaning water into the communication part of the band-shaped filter medium, a pressing mechanism for closing the communication part of the band-shaped filter medium, and a reverse winding mechanism for the band-shaped filter medium. The circulating cooling filtration apparatus according to 1.   The circulating cooling water filtering device according to any one of claims 1 to 4, wherein the band-shaped filter material is provided with a water-permeable shape retaining member. The circulating cooling water filtering device according to any one of claims 1 to 5, wherein the circulating cooling water is used for cooling a mold.

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