ES2355936T3 - Dirty liquid treatment apparatus. - Google Patents

Abstract

A contaminated fluid recovery apparatus, characterized in that it comprises: a dirty tank (11) containing a fluid to be cleaned; an outlet section (26) disposed in a position higher than a surface of the fluid (Q) of the dirty tank (11); a conveyor (20) with a scraper (24) that scrapes the extraction objects deposited in a lower part (11a) of the dirty tank (11), towards the outlet section (26), and includes a lower part (20a ) that travels along the lower part (11a) of the dirty tank (11), towards the outlet section (26), and an upper part (20b) that moves towards an initial end of the lower part (20a ), through an area above the bottom (20a); a fluid circulation section (32), with an opening (55) connecting the inside and outside of the dirty tank (11); a mud extraction mechanism (40), which includes a magnetic drum (42); fluid surface retention means, which maintain the fluid surface (Q) of the dirty reservoir (11), in a position higher than the fluid circulation section (32) and that the magnetic drum (42); characterized in that the magnetic drum (42) is located in the vicinity of the fluid circulation section (32) in the dirty tank (11), is rotatably actuated and is located in a horizontal posture substantially between the bottom (20a ) and the upper part (20b) of the conveyor (20), so that an axis (X) thereof extends along the direction of movement of the scraper (24) of the conveyor (20), and the entire periphery of the magnetic drum (42) is submerged in the contaminated fluid (D) in the dirty tank (11); an upper guide plate (51) and a lower guide plate (52) are arranged in the dirty tank (11), the guide plates (51 and 52) being curved in a circular arc, so that they extend as far as possible. length of the outer peripheral surface of the magnetic drum (42); an upper fluid conduit (53) that communicates with the opening (55), is formed between the upper guide plate (51) and the magnetic drum (42), and a lower fluid conduit (54) that communicates with the opening (55), is formed between the lower guide plate (52) and the magnetic drum (42); The contaminated fluid (D) in the dirty tank (11) passes into the opening (55) through the upper and lower fluid conduits (53 and 54).

Description

Technical Field

The present invention relates to an apparatus for recovering contaminated fluids, for the decontamination of a contaminated fluid in which they are mixed, for example, shavings, fine sludge, etc. 5

Previous Technique

A machine tool or similar for machining, such as for cutting, grinding, etc., uses a coolant-like fluid to cool a workpiece. The fluid is mixed with foreign matter, such as chips (cuttings) produced by machining, fine sludge, and so on. To recycle the contaminated fluid containing the chips, the sludge, etc., a contaminated fluid recovery apparatus is used to remove the chips, the sludge, etc. from the contaminated fluid.

The inventors of this document have long been developing apparatus for recovering contaminated fluid. Consequently, they have managed to develop high performance contaminated fluid recovery apparatus, which combine a conveyor and a sludge extraction mechanism provided with a magnetic drum, such as that described, for example, in the Kokai Publication of Japanese Patent Application Number 15 2005-66820.

The sludge removal mechanism includes the magnetic drum, which is located in a circulation section (drain section) near the fluid surface of a dirty tank. The fine magnetic sludge in a contaminated fluid is attracted to the outer peripheral surface of the magnetic drum. The conveyor is equipped with scrapers. The relatively large chips and the like, which are deposited at the bottom of the dirty deposit, are scraped by the scrapers towards an outlet section outside the dirty deposit.

Some contaminated fluids may contain ultrafine particles, such as very fine carbon particles. When the contaminated fluid recovery apparatus is operating, these ultrafine particles have to adhere to fine air bubbles and the like, mixed in the contaminated fluid, passing towards the surface of the dirty reservoir fluid, and floating for hours on the surface of the fluid. . If the sludge removal mechanism is located in the circulation section (drain section) near the surface of the dirty tank fluid, ultra-fine particles near the surface of the fluid inevitably flow to the side of a clean tank , through the circulation section.

Even if these ultrafine particles enter the clean tank, the contaminated fluid recovery apparatus can exhibit high performance without any concrete practical problem. However, since in the future, higher specifications of contaminated fluid recovery devices will be required, there may be a demand for contaminated fluid recovery devices that capture smaller ultrafine particles.

A contaminated fluid recovery apparatus according to the preamble of claim 1 is known from JP 62 103 936 U. 35

JP 63 098 706 U describes a conveyor with a scraper, a filter drum formed of punching metal, and a scraper next to the outer peripheral surface of the filter drum. In the filter drum, since the axis that forms the center of rotation is located in the direction of the width of the conveyor, the width of the filter drum is limited by the width of the conveyor.

JP 05 039 844 U discloses a chain with a projection that is moved by a drive motor, and a chain that is moved in the opposite direction by the drive motor.

Exhibition of the Invention

The objective of the present invention is to provide a contaminated fluid recovery apparatus capable of extracting very fine particles in a fluid, and not to say relatively large particles.

A contaminated fluid recovery apparatus of the present invention comprises the features of claim 1.

In accordance with the present invention, the chips and the like deposited in the lower part of the dirty tank, between the extraction objects mixed in the fluid, are extracted by means of the conveyor. The fine magnetic sludge that floats in the contaminated fluid is captured by the magnetic drum of the sludge extraction mechanism when it passes through the fluid circulation section. Since the magnetic drum is submerged in the fluid, the outer peripheral surface of the magnetic drum can be used effectively as a mud attraction surface.

As the chips and sludge that are scraped by the conveyor leave the surface of the fluid, some of the particles, for example, of carbon that float on the surface of the dirty tank fluid, adhere to the chips and sludge and are transported to the exit section.

When the operation of the contaminated fluid recovery apparatus is stopped, some of the fine particles that float on the surface of the dirty reservoir fluid sink into the contaminated fluid and adhere to the chips, sludge, etc., which deposit in the bottom of the dirty tank. When the operation of this apparatus resumes, the fine particles adhered to the chips and the sludge are scraped by the conveyor together with the chips and the sludge, towards the exit section. For these reasons, ultrafine particles that cannot be easily extracted by the transporter can also be efficiently extracted.

In a preferred form of this invention, the fluid surface retention means is a drain tank that communicates with the dirty tank through the fluid circulation section, and the decontaminated fluid through the fluid extraction mechanism. Mud is fed to a clean tank, through this drain tank.

In one aspect of the present invention, the conveyor is mobile in a first direction and in a second direction opposite to the first direction. The conveyor is moved in the first direction and the second direction, by means of a rotating drive mechanism that includes a reversible motor. The rotary drive mechanism is switched between the first direction and the second direction, by means of switching such as a timer.

If the conveyor is configured to be switchable between the first and second directions, the emerging chips and the like that are floating on the surface of the dirty tank fluid may adhere to the scraper or the like of the conveyor as they are moved towards the section output when the conveyor moves in the second direction. twenty

An example of the fluid surface retention means is a drain tank that communicates with the dirty tank through the fluid circulation section. When the fluid exceeds the drain tank, the surface of the dirty tank fluid is located in correspondence with the upper part of the conveyor.

In one aspect of the present invention, a first guide plate is formed that extends diagonally upwardly along the bottom of the conveyor, from the dirty tank to the outlet section, and a second guide plate is formed. which extends diagonally upward along the top of the conveyor. The scraper of the conveyor is configured to be in contact with the respective upper surfaces of these guide plates.

To further improve the degree of filtration, a filtration drum may be contained in the filtration reservoir into which the filtered fluid is introduced by the mud extraction mechanism. The filter drum is equipped with a filter. 30 The filter is composed of a porous plate with a large number of transverse holes formed therein. The porous plate is formed in a cylindrical profile. On a peripheral outer surface of the cylindrical porous plate, respective entries of the transverse holes are opened. On an inner peripheral surface of the porous plate, respective outlets of the transverse holes are opened. The transverse holes are formed, for example, by engraving. 35

The sludge that is produced when a carburized and tempered material is ground contains ferromagnetic or paramagnetic substances as well as magnetic substances. Mud of this type cannot be extracted thoroughly using only the magnetic drum. However, according to a form of the present invention provided with the filtering drum, a cleaner fluid can be obtained by filtering, by means of the filtering drum, the sludge containing non-magnetic or paramagnetic substances. 40

Brief Description of the Drawings

Figure 1 is a sectional view of a contaminated fluid recovery apparatus, in accordance with a first embodiment of the present invention;

Figure 2 is a sectional view of the contaminated fluid recovery apparatus, taken along the line F2-F2 of Figure 1; Four. Five

Figure 3 is a sectional view of a contaminated fluid recovery apparatus, in accordance with a second embodiment of the present invention;

Figure 4 is a sectional view of the contaminated fluid recovery apparatus, taken along the line F4-F4 of Figure 3; Y

Figure 5 is a plan view of a part of a porous plate of a filter drum. fifty

Best Way to Carry Out the Invention

A first embodiment of the present invention will now be described, with reference to Figures 1 and 2.

Figure 1 shows an outline of a recovery system that extracts foreign matter from a refrigerant used in a machine tool 1, such as a machining center, thereby making the refrigerant reusable. The contaminated refrigerant discharged from machine tool 1 is an example of a contaminated fluid D to be cleaned. Contaminated fluid D contains chips produced by cutting or the like, foreign matter that includes fine mud such as iron dust, and fine or ultrafine carbon particles or the like. 5

The contaminated fluid D is fed from the machine tool 1 to a contaminated fluid recovery apparatus 10, through a discharge conduit 2. The contaminated fluid recovery apparatus 10 serves to decontaminate the contaminated fluid D. A clean fluid C which is decontaminated by the contaminated fluid recovery apparatus 10, is fed back to the machine tool 1 through a supply conduit 4, after being pumped by a pump 3. 10

The following is a detailed description of the contaminated fluid recovery apparatus 10 used in the recovery system. As shown in Figures 1 and 2, the contaminated fluid recovery apparatus 10 includes a dirty tank 11, which contains the contaminated fluid D, and a clean tank 12 located next to the dirty tank 11. The contaminated fluid D is fed from the downstream end of the discharge duct 2, to the dirty tank 11. 15

In the final part of the dirty tank 11 a collection section 15 is formed. The collection section 15 extends diagonally upwards from the final part of the dirty tank 11. At the top of the collection section 15, a mechanism is provided rotary drive 16 which is driven by a motor.

A conveyor 20 is provided that extends along a bottom 11a of the dirty tank 11 and the collection section 15. The conveyor 20 includes a chain 23 as an example of a means of transmission of extraction 20, and scrapers 24 coupled to the chain 23. The chain 23 travels incessantly between an upper gearwheel 21 and a lower gearwheel 22. The chain 23 is moved in the direction indicated by arrow F in Figure 1, by means of the rotary drive mechanism 16 The chain 23 is guided by guiding elements 25 in their sense of movement. The guiding elements 25 are located at the bottom 11a of the dirty tank 11. 25

The scrapers 24 are arranged at regular intervals, in the longitudinal direction of the chain 23. The relatively large chips K (typically shown in Figure 2) to be removed, settle in the bottom 11a of the dirty tank 11. The chips K, together with the sludge and the like, they are transported to the outlet section 26 through the collection section 15 by the scrapers 24. The outlet section 26 is located outside the dirty tank 11. The outlet section 26 is located in a position superior to a surface Q of the dirty tank fluid 30 11. The chips, sludge, etc., which has reached the outlet section 26 fall from the outlet section 26 towards a recovery box 27.

The conveyor 20 includes a lower part (part outwards) 20a and an upper part (part inwards) 20b. The lower part 20a of the conveyor 20 moves along the lower part 11a of the dirty tank 11, towards the outlet section 26. The upper part 20b of the conveyor 20 moves from the outlet section 26 towards an initial end 20c of the lower part 20a, through an area on the lower part 20a. A lower sprocket 22 is located at the initial end 20c.

As shown in Figure 1, the clean tank 12 is formed next to the dirty tank 11. The clean tank 12 is separated from the dirty tank 11 by a dividing plate 30. As shown in Figure 2, a drain tank 31 which functions as a means for retaining the surface of the fluid, is coupled to the side 40 of the dirty reservoir 11. The cleaned fluid C which is decontaminated through a mud extraction mechanism 40 (mentioned below), flows through from drain tank 31 to clean tank 12.

The drain tank 31 communicates with the dirty tank 11 through a fluid circulation section 32. If the level of the fluid surface Q of the dirty tank 11 exceeds a predetermined height, the cleaned fluid C overflows an upper end 31a of the drain tank 31. As the overflowed clean fluid C flows to the clean tank 45 12, the fluid surface Q of the dirty tank 11 is maintained at the predetermined height. The fluid surface Q of the dirty tank 11 is held in a position higher than the fluid circulation section 32 and that a magnetic drum 42, by the drain tank 31.

The dirty tank 11 is provided with the mud extraction mechanism 40. The mud extraction mechanism 40 of this embodiment is provided with a magnetic drum 42, a motor 43 (shown in Figure 1), a power transmission system 44 50, a scraping element 45, etc. The magnetic drum 42 is contained in the dirty tank 11. The motor 43 rotates the magnetic drum 42 in the direction of the date A of Fig. 2. The power transmission system 44 transmits the rotation of the motor 43 to the magnetic drum 42. The scraping element 45 is disposed in the dirty tank 11.

The magnetic drum 42 is a cylinder of a non-magnetic material, such as stainless steel. A magnet 46 with strong magnetism is located in the magnetic drum 42. There is a definite separation between the outer surface of the magnet 46 and the inner peripheral surface of the magnetic drum 42. The magnet 46 is fixed to a frame 47 that is coupled to the dirty tank The magnetic drum 42 rotates in relation to the magnet 46, in the sense of the date A.

In the vicinity of the fluid circulation section 32, in the dirty tank 11, the magnetic drum 42 is located between the lower part 20a and the upper part 20b of the conveyor 20. More specifically, an X axis of the magnetic drum 42 is extends along the direction of movement (indicated by arrow F), as shown in Figure 1. The magnetic drum 42 is supported in a substantially horizontal posture, by means of the frame 47 (shown in Figure 2) or Similary. The entire periphery of the magnetic drum 42 is submerged in the contaminated fluid D. 5

As shown in Figure 2, an upper guide plate 51 and a lower guide plate 52 are arranged in the dirty tank 11. The guide plates 51 and 52 are curved in a circular arc, so that they extend to along the outer peripheral surface of the magnetic drum 42. Between the upper guide plate 51 and the magnetic drum 42, an upper fluid conduit 53 is formed. Between the lower guide plate 52 and the drum 42, a conduit is formed of lower fluid 54. In Figure 2, arrow B indicates the direction in which the fluid flows. 10

The fluid ducts 53 and 54 communicate with the drain tank 31 through an opening 55. The opening 55 is formed in the side wall 11b of the dirty tank.

The fluid conduits 53 and 54 and the opening 55, constitute the above-mentioned fluid circulation section 32, for connecting the inside and outside of the dirty reservoir 11. The mentioned magnetic drum 42 is located near the circulation section 32 of fluid. fifteen

As shown in Figure 2, one end 45a of the scraping element 45 is in contact with the outer peripheral surface of the magnetic drum 42, substantially covering the entire axial length of the magnetic drum 42. The other end 45b of the scraping element 45 extends diagonally downwards, in the direction of the lower part 20a of the conveyor 20. The sludge and the like, which adhere to the outer peripheral surface of the magnetic drum 42, are detached by the scraping element 45. The sludge and the like detached, they fall towards the lower part 20a of the conveyor 20.

The following is a description of the operation of the contaminated fluid recovery apparatus 10, constructed in this way.

The contaminated fluid D discharged from the machine tool 1 is fed to the dirty tank 11 through the discharge duct 2. The chips K contained in the contaminated fluid D settle, in a short time, 25 on the bottom 11a of the dirty tank 11, as shown in Figure 2. The chips K are transported along the collection section 15, from the bottom 11a of the dirty tank 11 to the outlet section 26, by the scrapers 24 of the conveyor 20. The chips K that are transported to the outlet section 26 fall into the recovery box 27.

On the other hand, the contaminated fluid D in the dirty tank 11 passes into the opening 55 through the 30 fluid conduits 53 and 54, between the outer peripheral surface of the magnetic drum 42 and the guiding plates 51 and 52. Next , in fine magnetic sludge that floats in the contaminated fluid D is attracted to the outer peripheral surface of the magnetic drum 42, by the magnetic force of the magnet 46. Since all the magnetic drum 42 is submerged in the fluid, the surfaces both upper and lower. Magnetic drum bottom 42 can be used effectively as mud attraction surfaces. 35

The cleaned fluid C which is decontaminated by the sludge extraction mechanism 40, flows through the opening 45 to the drain tank 31. In addition, the cleaned fluid C drains through the upper end 31a of the drain tank 31, and flows to the clean deposit 12.

When the magnetic drum 42 rotates, the sludge S which is attracted towards the outer peripheral surface of the magnetic drum 42, is detached by the scraping element 45. The detached fluid S falls on the lower part 20a 40 of the conveyor 20. The sludge S which has fallen on the lower part 20a of the conveyor 20, is scraped towards the outlet section 26 by the scrapers 24.

The scraping element 45 drops the sludge S, which is removed by scraping the magnetic drum 42, towards the lower part 20a of the conveyor 20. Therefore, the sludge S can be prevented from going against the upper part 20b of the conveyor 20 when it falls , so that the failure consisting of sludge S is diffused back to the contaminated fluid D. can be avoided.

Scrapers 24 that scrape off chips K and sludge S, pass from the interior of the contaminated fluid D to the outlet section 26 through the fluid surface Q. When the scrapers 24 cross the fluid surface Q, the fine particles P that float on the surface of the fluid Q adhere to chips K and sludge S that travel along with scrapers 24. Therefore, fine particles P, together with chips K and sludge S, 50 are delivered to exit section 26.

Thus, the contaminated fluid D in the dirty tank 11 is decontaminated and converted into the cleaned fluid C. The cleaned fluid C flows through the drain tank 31, to the clean tank 12. The cleaned fluid C which is introduced into the clean tank 12, is pumped up by the pump 3 and fed back to the machine tool 1 through the supply conduit 4. Since a dividing wall 11c dividing the surface is arranged in an upper part of the dirty tank 11, 55 of fluid Q and the drain tank 31, the fine particles

P that float on the surface of the fluid Q remain in the dirty tank 11 and can never flow into the clean tank 12.

If the operation of the machine tool 1 is stopped, so that the contaminated fluid recovery apparatus 10 stops at night or on vacation, over time the fine particles P that have been floating on the surface of the fluid Q of the dirty tank 11 gradually settle in the contaminated fluid D. The fine deposited particles P adhere to the chips and sludge deposited in the lower part 11a of the dirty tank 5 11.

If the operation of the machine tool 1 is resumed, so that the contaminated fluid recovery apparatus 10 is activated, the conveyor 20 begins to move. When the scrapers 24 of the conveyor 20 move, the fine particles P and the ultrafine particles deposited in the lower part 11a of the dirty tank 11, are scraped along with the chips K and the sludge S, towards the outlet section 26, by means of the scrapers 24. Therefore, even the ultrafine particles in the contaminated fluid D are exhaustively extracted, so that a cleaned fluid C with a very high purity can be obtained.

The magnetic drum 42 is located between the lower part 20a and the upper part 20b of the conveyor 20. The magnetic drum 42 is oriented so that its axis S extends along the direction of movement (direction of arrow F) of the conveyor 20. Therefore, the internal space of the dirty tank 11 can be used effectively. In particular, the height of the dirty tank 11 containing the magnetic drum 42 can be reduced, and the magnetic drum 42, whose dimension in the direction of the X axis is large, can be located along the conveyor 20.

Next, a contaminated fluid recovery apparatus 10 'according to a second embodiment of the present invention will be described, referring to Figures 3 to 5. Since the basic functions and configurations 20 of the contaminated fluid recovery apparatus 10' are same as those of the contaminated fluid recovery apparatus 10 of the first embodiment, common numbers are used to designate common parts shared with the first embodiment, and their description is omitted. The following is a description of different configurations.

A conveyor 20 of the second embodiment is movable in a first direction indicated by arrow F in Figure 3, and in a second direction indicated by arrow R in Figure 3. The conveyor 20 can be moved in the first direction F and in the second direction R, by means of a rotating drive mechanism 16. The rotating drive mechanism 16 includes a reversible motor 100. The motor 100 functions as a power source. The engine 100 is constructed so that its direction of rotation can be reversed for each predetermined instant, by a controller 102 that includes a timer 101. The timer 101, which functions as a means of switching, has its (interval of) timing for the change of direction, so that the time is longer in the first sense F than in the second sense R.

A drain tank 31 (shown in Figure 4) functions as a means of retaining the fluid surface. In particular, the height of an upper end 31a of the drain tank 31 is configured such that a fluid surface Q of a dirty tank is located, in operation, on scrapers 24 in an upper portion 35b of the conveyor 20.

As shown in Figure 3, a collection section 15 is arranged between the dirty tank 11 and the outlet section 26. A first guide plate 103 and a second guide plate 104 are arranged in the collection section 15. These guide plates 103 and 104 are vertically separated from each other. The first guide plate 103 extends diagonally upwards, along a lower part 20a of the conveyor 20, from a lower part 11a of the dirty tank 11, towards the outlet section 26. The second guide plate 104 extends diagonally upwards, along the upper part 20b of the conveyor 20, from an upper part of the dirty tank 11 towards the outlet section 26. An upper end part 104a of the second guide plate 104, is located on the section of output 26. The scrapers 24 of the conveyor 20 are individually in contact with the respective upper surfaces of these guide plates 103 and 104. 45

As shown in Figure 4, a filtrate tank 120 is disposed between the dirty tank 11 and the drain tank 31. The fluid C which is filtered by a magnetic drum 42, flows to the filtrate tank 120 through a opening 55. A filter drum 130 is contained in the filter tank 120. The filter drum 130 is obtained by forming a porous plate 140 in a cylindrical shape (part of which is shown in Figure 5) that functions as a filter . The filtering drum 130 is supported for rotation about a horizontal axis, by means of a bearing (not shown) which is coupled to the filtering tank 120. The filtering drum 130 is rotatably actuated together with the magnetic drum 42, by means of a power transmission system 44.

As shown in Figure 5, the porous plate 140 that functions as a filter has a large number of transverse holes 150 that are shaped to predetermined separations. The transverse holes 150 may be formed, for example, by photoengraving. Although in the example each transverse hole 150 is circular, instead a transverse hole of any other non-circular shape can be adopted. The diameter of the transverse hole 150 is also selected according to the application. An inlet of the transverse hole 150 opens on the outer peripheral surface of the porous plate 140 cylindrical in shape. An outlet of the cross hole 150 is

it opens on the inner peripheral surface of the porous plate 140 cylindrically.

The following is a description of the operation of the apparatus 10 ’for recovering contaminated fluid, according to the second embodiment.

When the conveyor 20 travels in the first direction F, the sludge, the chips (chips deposited) and the like, deposited in the lower part 11a of the dirty tank 11, are displaced along the first guide plate 103 of the collection section 15, towards the exit section 26, by the scrapers 24. The sludge and the like, which are moved up to the exit section 26, fall from the exit section 26 to the recovery box 27 (shown in Figure 1). This point is common with the contaminated fluid recovery apparatus 10 of the first embodiment.

When the conveyor 20 travels in the second direction R, the fine sludge (small floating chips) 10 that float near the fluid surface Q of the dirty reservoir 11 adheres to the scrapers 24. The sludge and the like, which adhere to the scrapers 24, they move along the second guide plate 104 towards the outlet section 26. The sludge and the like, which move upwardly to the outlet section 26, fall from the upper end portion 104a of the second guide plate 104, towards exit section 26.

In the present embodiment, the collection section 15 is provided with the second guide plate 104. When the conveyor 20 travels in the second direction R, the sludge (floating chips, etc.) that adheres to the conveyor can be prevented 20, fall from the scrapers 24 to the dirty tank 11. Therefore, the floating chips that adhere to the scrapers 24 can be efficiently moved upwardly to the upper end portion 104a of the second guide plate 104.

The fluid C that is filtered through the magnetic drum 42 of the sludge extraction mechanism 40, flows to the filtrate tank 120 through the opening 55. The fluid C that is introduced into the filtrate tank 120, passes through of the transverse holes 150 at a relatively low speed, from the outside of the filtering drum 130 to the filtering drum 130. When the fluid C flows to the filtering drum 130, filtering objects are captured near the inlets of the transverse holes 130 Relatively large, in fluid C. Fine and similar particles in fluid C, are captured by adhering to relatively large filtering objects, which are captured by transverse holes 150.

Therefore, an ultra-clean fluid C 'that is substantially thoroughly filtered flows slowly to the filter drum 130. The ultra-clean fluid C 'which is introduced into the filter drum 130, flows to the drain tank 31 through a circulation section 160.

The ultra-clean fluid C 'in the drain tank 31, drains through the upper end 31a of the drain tank 30 and flows to the clean tank 12.

When the filtering drum 130 rotates in the fluid C, the filtering objects, which adhere to the outer peripheral surface of the cylindrical filtering drum 130, are easily separated from the porous plate 140 by the fluid C which flows relatively around the filter drum 130, by a centrifugal force caused by the rotation of the filter drum 130, and so on. 35

Industrial Applicability

In the implementation of this invention, it should be understood that the components of the contaminated fluid recovery apparatus, including the conveyor, the fluid circulation section, the mud extraction mechanism, the fluid surface retention means, The filter drum, etc., as well as the dirty container, can be made in various modified forms, without departing from the scope of this invention, as defined by the claims.

REFERENCES CITED IN THE DESCRIPTION

The list of references cited by the applicant is for the convenience of the reader only. It is not part of the European Patent document. Although special care has been taken in collecting references, errors or omissions cannot be ruled out and the EPO disclaims all responsibility in this regard.

Patent documents cited in the description: 5

 JP 2005 066 820 A [0003]

JP 62 103 936 U [0007]

JP 63 098 706 U [0008]

JP 05 039 844 U [0009]

Claims (6)

1.- A contaminated fluid recovery apparatus, characterized in that it comprises: a dirty tank (11) containing a fluid to be cleaned; an outlet section (26) disposed in a position higher than a surface of the fluid (Q) of the dirty tank (11); 5 a conveyor (20) with a scraper (24) that scrapes the extraction objects deposited in a lower part (11a) of the dirty tank (11), towards the outlet section (26), and includes a lower part (20a ) that travels along the lower part (11a) of the dirty tank (11), towards the outlet section (26), and an upper part (20b) that moves towards an initial end of the lower part (20a ), through an area above the bottom (20a); 10 a fluid circulation section (32), with an opening (55) connecting the inside and outside of the dirty tank (11); a mud extraction mechanism (40), which includes a magnetic drum (42); fluid surface retention means, which maintain the fluid surface (Q) of the dirty reservoir (11), in a position higher than the fluid circulation section (32) and that the magnetic drum (42); fifteen characterized because The magnetic drum (42) is located in the vicinity of the fluid circulation section (32) in the dirty tank (11), is rotatably actuated and is located in a horizontal posture substantially between the bottom (20a) and the upper part (20b) of the conveyor (20), so that an axis (X) thereof extends along the direction of movement of the scraper (24) of the conveyor (20), and the entire periphery of the drum 20 magnetic (42) is submerged in the contaminated fluid (D) in the dirty tank (11); an upper guide plate (51) and a lower guide plate (52) are arranged in the dirty tank (11), the guide plates (51 and 52) being curved in a circular arc, so that they extend as far as possible. length of the outer peripheral surface of the magnetic drum (42); an upper fluid conduit (53) communicating with the opening (55), is formed between the upper guide plate 25 (51) and the magnetic drum (42), and a lower fluid conduit (54) communicating with the opening (55), is formed between the lower guide plate (52) and the magnetic drum (42); The contaminated fluid (D) in the dirty tank (11) passes into the opening (55) through the upper and lower fluid conduits (53 and 54). 2. A contaminated fluid recovery apparatus according to claim 1, characterized in that the fluid surface retention means is a drain tank (31) that communicates with the dirty tank (11) through the section (32) of fluid circulation, and the decontaminated fluid through the mud extraction mechanism (40) is fed to the clean tank (12) through the drain tank (31). 3. A contaminated fluid recovery apparatus according to any of claims 1 and 2, characterized in that the conveyor (20) is movable in a first direction and in a second direction opposite to the first direction, includes a rotary drive mechanism (16) for moving the conveyor (20) in the first direction and in the second direction, and switching means for switching the rotary drive mechanism (16) between the first direction and the second direction, and is provided with the retaining means of the fluid surface, to place the fluid surface (Q) of the dirty tank (11) in the upper part (20b) of the conveyor (20). 4. A contaminated fluid recovery apparatus according to claim 3, characterized in that the rotary drive mechanism (16) includes a reversible motor (100) for use as a power source, and the switching means includes a timer (101) to switch the direction of motor rotation (100). 5. A contaminated fluid recovery apparatus according to claim 1, characterized in that it further comprises a filtrate tank (120) in which the fluid filtered by the sludge extraction mechanism (40) is introduced, and a drum of filtering (130) contained in the filtering tank (120), including the filtering drum (130) a filter that is obtained by cylindrically forming a porous plate (140) with a large number of transverse holes (150) formed in the same, the respective entries of the transverse holes (150) opening on an outer peripheral surface of the porous plate (140), and the outputs on an inner peripheral surface of the porous plate (140). fifty