JP2005137953A - Soil purifying apparatus and washing liquid circulating apparatus for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil purifying apparatus in which contaminated soil is efficiently purified with the necessary minimum quantity of a washing liquid without separately providing an external liquid source, and a washing liquid circulating apparatus for the same. <P>SOLUTION: The soil purifying apparatus is provided with a soil supply part 17 for supplying the soil contaminated with a contaminant, a washing liquid supply part 18 for supplying the washing liquid for washing the soil, a treatment mechanism part 15 for stirring and washing the soil supplied from the soil supply part 17 in the purifying liquid supplied from the washing liquid supply part 18, a discharge part 16 for discharging the soil cleaned in the treatment mechanism part 15 to the outside of the apparatus, a circulation pipe line 401 for connecting the treatment mechanism part 15 to the washing liquid supply part 18 and circulating the washing liquid used in the treatment mechanism part 15 to the washing liquid supply part 18, and a washing liquid purifying means for purifying the washing liquid stored in the washing liquid supply part 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a soil purification apparatus for cleaning soil containing specific harmful substances such as heavy oil, volatile organic compounds, heavy metals such as hexavalent chromium and lead, and more specifically, without providing an external water source separately. The present invention relates to a soil purification device that can efficiently clean contaminated soil with a minimum amount of cleaning liquid, and a cleaning liquid circulation device thereof.

  In recent years, with the redevelopment of factory sites, problems of soil contamination due to heavy metals, volatile organic compounds, and petroleum-based oils and other specific harmful substances have become apparent. The establishment of countermeasures was strongly requested by society, and in February 2003, the Soil Contamination Countermeasures Law was enforced. This soil pollution control law obligates land surveys when abolishing facilities that use hazardous substances, and orders surveys even for facilities that are in use that may cause health damage due to soil contamination. be able to. As a result of the survey, the land where contamination is found is listed as a contaminated area in the designated area register, and the landowner must take necessary countermeasures.

  Countermeasures stipulated in the Soil Contamination Countermeasures Law include removal of pollutants, containment to prevent the spread of pollution, and insolubilization to prevent leaching of pollutants into groundwater, but they have been deleted from the designated area register In order to achieve this, it is necessary to remove pollutants. At present, the removal of pollutants is becoming a social trend. Therefore, as one of the methods for removing the contaminants, for example, by introducing the contaminated soil into the treatment tank (reaction tank) storing the cleaning liquid (solution) and stirring it, the contaminant in the soil is moved into the cleaning liquid and contaminated. A fixed-type contaminated soil purification apparatus for cleaning soil has been proposed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-147086

  However, since the cleaning treatment is usually performed by stirring the contaminated soil in the treatment tank containing the cleaning liquid, as represented by the above prior art, in the cleaning liquid prepared in the treatment tank as the treatment progresses. The amount of fine sediment with high pollution concentration floating in the soil increases. Therefore, the cleaning liquid in the treatment tank must be replaced after the work has progressed to some extent so as not to impair the cleaning effect. Therefore, a large amount of cleaning liquid is consumed in the conventional cleaning process, and depending on the amount of contaminated soil, a large amount of external water source must be prepared separately to supply a large amount of cleaning liquid to the treatment tank. It was.

  The present invention has been made on the basis of the above matters, and an object of the present invention is to provide a soil purification apparatus capable of efficiently cleaning contaminated soil with a minimum amount of cleaning liquid without separately providing an external water source, and its The object is to provide a cleaning liquid circulation device.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a soil / sand supply unit for supplying soil / soil contaminated with a contaminant, a cleaning liquid supply unit for supplying a cleaning liquid for soil cleaning, and the cleaning liquid supply unit. A processing mechanism that stirs and cleans the earth and sand supplied from the earth and sand supply unit in the cleaning liquid supplied from the discharge unit, and a discharge unit that discharges the earth and sand cleaned by the processing mechanism to the outside of the machine, and the processing A circulation line for connecting the mechanism part and the cleaning liquid supply part to circulate the cleaning liquid used in the processing mechanism part to the cleaning liquid supply part, and cleaning liquid purification means for purifying the cleaning liquid stored in the cleaning liquid supply part It is characterized by that.

  Further, the second invention is provided on the main body frame, on one side in the longitudinal direction of the main body frame, for supplying earth and sand contaminated with contaminants, on the main body frame, and on the earth and sand. A processing mechanism unit that stirs and cleans the earth and sand supplied from the supply unit in the cleaning liquid, a cleaning liquid supply unit that is provided in the main body frame and supplies the cleaning liquid to the processing mechanism unit, and a processing mechanism unit. A discharge section for discharging the washed earth and sand to the outside of the apparatus, a circulation line for connecting the processing mechanism section and the cleaning liquid supply section, and circulating the cleaning liquid used in the processing mechanism section to the cleaning liquid supply section; A cleaning liquid purifying unit that is provided in the cleaning liquid supply unit and purifies the cleaning liquid stored in the cleaning liquid supply unit, and a stirring device that stirs the cleaning liquid in the cleaning liquid supply unit.

  Further, the third invention is a main body frame, traveling means provided at a lower portion of the main body frame, a earth and sand supply unit provided on one side in the longitudinal direction of the main body frame and supplying earth and sand contaminated with pollutants. Provided in the main body frame, and provided in the main body frame by a processing mechanism for stirring and cleaning in the cleaning liquid storing the earth and sand supplied from the earth and sand supply unit by a paddle mixer provided in the inside, A cleaning liquid supply unit that supplies the cleaning liquid to the processing mechanism unit, a discharge unit that discharges the earth and sand cleaned by the processing mechanism unit, the processing mechanism unit and the cleaning liquid supply unit are connected, and the processing mechanism A circulation pipe for circulating the cleaning liquid used in the cleaning section to the cleaning liquid supply section, a cleaning liquid purification means provided in the cleaning liquid supply section for purifying the cleaning liquid stored in the cleaning liquid supply section, A power unit provided in the other longitudinal side of the body frame, characterized in that a stirring device for stirring the cleaning fluid in the cleaning liquid supply section.

  According to a fourth invention, in any one of the first to third inventions, the water level detecting means for detecting the water level of the cleaning liquid in the processing mechanism section, and the processing based on the detection signal from the water level detecting means. And a control device for controlling the cleaning liquid supply unit so as to maintain the water level in the mechanism unit.

  In addition, a fifth invention according to any one of the first to fourth inventions, wherein the cleaning liquid purification means includes a flocculant supply device that supplies a flocculant that aggregates solid matter floating in the cleaning liquid. Features.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, a flow rate detecting means for detecting a flow rate of the cleaning liquid flowing through the circulation pipe, and agglutination of the flocculant supply device according to a detection signal from the flow rate detecting means And a control device for controlling the supply amount of the agent.

  In addition, a seventh invention is characterized in that, in any one of the first to sixth inventions, the cleaning liquid purification means has a recovery case for recovering the solid matter precipitated in the cleaning liquid.

  The eighth invention is characterized in that, in the seventh invention, the recovery case is detachably provided in the cleaning liquid supply section.

  The ninth invention is characterized in that, in any one of the first to eighth inventions, the cleaning liquid purification means has a filter that adsorbs contaminants floating in the cleaning liquid.

  A tenth aspect of the invention includes a liquid tank that stores cleaning liquid for earth and sand cleaning, a liquid supply unit that supplies the cleaning liquid stored in the liquid tank to the processing mechanism unit, the processing mechanism unit, and the liquid tank. A circulation line for connecting and circulating the cleaning liquid used in the processing mechanism section to the liquid tank, and cleaning liquid purification means for purifying the cleaning liquid stored in the liquid tank are provided.

An eleventh aspect of the invention includes a liquid tank that stores a cleaning liquid for cleaning earth and sand, a liquid supply unit that supplies the cleaning liquid stored in the liquid tank to a processing mechanism unit, the processing mechanism unit, and the liquid tank. A circulation line for circulating the cleaning liquid used in the processing mechanism section to the liquid tank; cleaning liquid purification means for purifying the cleaning liquid stored in the liquid tank; and a stirring device for stirring the cleaning liquid in the liquid tank; It is provided with.

  According to the present invention, the circulation line is provided, the cleaning liquid used in the rear part of the processing tank machine is returned to the cleaning liquid supply part, the used cleaning liquid is purified by the cleaning liquid purification means, and again supplied to the processing mechanism as a clean cleaning liquid. As a result, the contaminated soil can be efficiently washed with the minimum necessary washing liquid without separately providing an external water source.

Hereinafter, embodiments of a soil purification apparatus of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing the overall configuration of an embodiment of the soil purification apparatus of the present invention. In the following description, directions corresponding to the left and right in FIG. 1 are appropriately described as one and the other or the front-rear direction of the soil purification apparatus.
In FIG. 1, reference numeral 1 denotes a traveling body as traveling means that enables self-running. The traveling body 1 includes a track frame 2, driving wheels 3 and driven wheels 4 provided at both front and rear ends of the track frame 2. A driving device (traveling hydraulic motor, which may be electric) 5 directly connected to the driving wheel 3 and a crawler belt (infinite track crawler) 6 wound around the driving wheel 3 and the driven wheel 4 are configured. However, in the present embodiment, it is assumed that the contaminated soil is intermittently charged by a hydraulic excavator or the like, and in order to prevent the vehicle body from becoming unstable due to an impact load at the time of earth and sand injection, etc. The crawler type traveling means provided with the crawler belt 6 is taken as an example. However, for example, when earth and sand are continuously charged using a conveyor or the like, the so-called wheel type traveling means may be used instead. good.

  Reference numeral 7 denotes a main body frame for supporting various mechanisms and devices provided on the upper portion of the track frame 2. A support beam 10 is supported on one side in the longitudinal direction of the main body frame 7 via support posts 8 and 9. On the other side in the longitudinal direction, a plate-like support frame 13 is supported via support posts 11 and 12. Although the detailed structure of each will be described later, a supply section 14 for contaminated soil and cleaning liquid is provided on one side of the main body frame 7 in the longitudinal direction, a processing mechanism section 15 is provided at a substantially central portion, and further below the processing mechanism section 15. The discharge part 16 is provided toward the back from the position.

The supply unit 14 includes a sediment supply unit 17 that supplies the introduced sediment to the processing mechanism unit 15, and a cleaning liquid supply unit 18 that supplies a cleaning liquid to the processing mechanism unit 15. Here, the earth and sand supply part 17 is demonstrated first.
FIG. 2 is a side view showing a detailed structure of the earth and sand supply unit 17 constituting one embodiment of the soil purification apparatus of the present invention. In FIG. 2, the same parts as those in FIG.
As shown in FIG. 2, the earth and sand supply unit 17 includes a sieve device 19 that sorts the charged earth and sand according to the particle size, and a hopper 20 as a sand and sand receiving means that receives the charged earth and sand selected by the sieve device 19; A transport conveyor 21 as transport means for transporting the earth and sand received in the hopper 20 to the processing mechanism unit 15 is provided.

  The configuration of the sieving device 19 will be described. Reference numeral 22 denotes a support frame that forms the main body of the sieving device 19, and this support frame 22 is attached to the bases 23 and 24 (see FIG. 1) provided on the support beam 10. 25, the main body frame 7 is supported so as to be able to vibrate, and is vibrated by a driving device (vibration device) (not shown). 26 is a lattice mounted in the support frame 22, and the earth and sand introduced into the sieving device 19 by, for example, a hydraulic excavator or the like is also subjected to the action of vibration, leading to a sediment component smaller than the eyes of the lattice 26 downward. Solid foreign matters larger than the eyes of the lattice 26, such as concrete, rock, or metal, are removed. The solid foreign matter remaining on the lattice 26 by this sorting moves forward along the inclination of the lattice 26 and falls. A chute 27 guides foreign matter.

  The hopper 20 will be described. The hopper 20 is formed by a frame having an upwardly expanding shape that is open at the top and bottom, and is positioned between the sieve device 19 and the upstream side (left side in FIG. 2) of the conveyor 21. As described above, it is supported from the main body frame 7 via the support beam 10 and the support posts 8 and 9 (see FIG. 1). The upper opening 28 of the hopper 20 is about the same as or slightly larger than the lower opening of the support frame 22 of the sieving device 19, and the width of the lower opening 29 is the same as the width of a conveyor belt 35 (described later) of the conveyor 21. The degree is slightly narrower than that. In addition, a sediment outlet (not shown) is provided in the downstream side wall 30 of the hopper 20 so as to face the conveyor belt 35.

  The conveyance conveyor 21 will be described. First, reference numeral 31 denotes a conveyor frame constituting the main body of the conveyance conveyor 21. The conveyor frame 31 is inclined upward (may be substantially horizontal) toward the downstream side (right side in FIG. 2). Thus, it is supported from the main body frame 7 through the support posts 8 and 9 (see FIG. 1) and the beam 32 (see FIG. 1) provided thereon. Thereby, as shown in FIG. 1, the conveyance conveyor 21 has one end side positioned below the hopper 20 and the other end facing the inlet 55 (see FIG. 1 described later) of the processing mechanism unit 15.

  Reference numerals 33 and 34 denote driven wheels and driving wheels rotatably supported at both ends of the conveyor frame 31, respectively, and reference numeral 35 denotes a conveying belt wound around the driven wheels 33 and the driving wheels 34. Reference numeral 36 denotes a drive device for the transfer conveyor 21 (a transfer hydraulic motor, which may be electric). The drive device 36 is directly connected to the drive wheel 34 and is driven to rotate with the driven wheel 33 by rotating the drive wheel 34. The conveyor belt 35 is driven to circulate between the wheels 34. Reference numeral 37 denotes a plurality of support rollers that support the conveyance surface of the conveyance belt 35, and these support rollers 37 are arranged at predetermined intervals in the longitudinal direction of the conveyor frame 31 so as to contact the back side of the conveyance surface of the conveyance belt 35. Yes. With such a configuration, the conveyor 21 is configured to introduce the earth and sand placed on the conveyor belt 35 in the hopper 20 to the cutting processing mechanism unit 15 outside the hopper 20 through the earth and sand outlet. . Since the amount of earth and sand transported is determined by the opening area of the sand cutting exit of the hopper 20 and the transport speed of the transport belt 35, it can be adjusted by controlling the rotational speed of the transport driving device 36.

  In addition, 38 is a belt tension adjusting device, and this belt tension adjusting device 38 adjusts the front-back direction position in the conveyor frame 31 of the driven wheel 33, and adjusts the tension | tensile_strength of the conveyance belt 35. FIG. Reference numeral 39 denotes a regulating plate that covers both sides in the width direction of the conveyor belt 35 in the downstream portion of the hopper 20, and the regulating plate 39 prevents the earth and sand conveyed toward the processing mechanism unit 15 from spilling from the conveyor belt 35. It is preventing.

3 is a side view showing a detailed structure of the cleaning liquid supply unit 18 constituting one embodiment of the soil purification apparatus of the present invention, FIG. 4 is a plan view thereof, and FIG. 5 is a side view showing details of a liquid tank 40 described later. In these drawings, the same parts as those in the previous drawings are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 3, the cleaning liquid supply unit 18 includes a liquid tank 40 that stores the cleaning liquid, a liquid supply unit 41 that supplies the cleaning liquid in the liquid tank 40 to the processing mechanism unit 15, a recovery case 407 and a filter that will be described later. 419, and a cleaning liquid purification means including a flocculant supply device 421 and the like.

  The liquid tank 40 is provided at a position below the earth and sand supply unit 17 and is directly supported on one side in the longitudinal direction of the main body frame 7 so as to be easily supplied by, for example, a tank truck. 42 is a water supply port of the liquid tank 40, and 43 is a cap of the water supply port 42. When storing the cleaning liquid in the liquid tank 40, the cap 43 is removed and the cleaning liquid is replenished through the water supply port 42. The upper surface of the liquid tank 40 includes a top plate 400 and a maintenance upper door (not shown), and the upper door is fixed with bolts or the like.

  Connected to the upper part of the liquid tank 40 is an inflow conduit (circulation conduit) 401 through which the cleaning liquid used in the processing mechanism section 15 flows. The upstream end of the circulation line 401 is a strainer 402 provided at a position slightly lower than the cleaning liquid level (the symbol ▽ position in FIG. 3) in the processing tank 53 of the processing mechanism unit 15, and the downstream end is a liquid tank. The circulation line 401 is inclined downward toward the liquid tank 40 so that the cleaning liquid in the vicinity of the liquid level in the processing tank 53 flows into the liquid tank 40 and circulates due to the difference in water level. It has become. However, instead of the circulation method using such a water level difference, an active circulation method using a pump or the like may be employed.

  In addition, an impeller-type flow meter 404 (see FIG. 3) is provided in the middle of the circulation conduit 401. By detecting the flow rate of the cleaning liquid flowing in by the flow meter 404, a flocculant to be described later is provided. The supply amount is determined. Furthermore, the circulation pipe 404 is provided with water stop valves 405 and 406. The water stop valves 405 and 406 are used to stop the flowing cleaning liquid and perform maintenance and the like in the liquid tank 40 from the maintenance upper door. Considered to be able to do.

  The bottom plate 46 of the liquid tank 40 has a substantially quadrangular pyramid shape, and a cylindrical body 406 is connected to the apex of the bottom plate 46, and solid matter that precipitates in the cleaning liquid in the liquid tank 40 follows the inclination of the bottom plate 46. It is guided into the cylinder 406 and is collected in the collection case 407 via the cylinder 406. The upper surface of the recovery case 407 has a flange shape, and is bolted to a flange 408 attached to the cylindrical body 406 via a seal (not shown) so that it can be attached to and detached from the liquid tank 40. Further, a butterfly valve 409 is provided in the cylindrical body 406 so that water can be stopped between the cylindrical body 406 and the collection case 407. The butterfly valve 409 has a known configuration, and the handle shaft is rotated by the handle 410, and the rotational force decelerated by the worm gear unit (not shown) is transmitted to the valve shaft 411 to open and close. The recovery case 407 is provided with a ball valve 412. By opening the ball valve 412, the cleaning liquid in the liquid tank 40 and the recovery case 407 can be discharged.

  A stirring device 413 that stirs the cleaning liquid in the liquid tank 40 is provided in the liquid tank 40, and functions to stir the flocculant and the cleaning liquid described later. The stirring device 413 includes a stirring blade 414 and a rotating shaft 415, and the rotating shaft 415 is rotatably held by a bearing (not shown) provided on the top plate 400. The driving device (stirring driving device) 416 of the stirring device 415 is fixed to the top plate 400 via a bracket 417, and its output shaft is directly connected to the upper end portion of the rotating shaft 415. With such a configuration, the driving force of the stirring driving device 416 is transmitted to the rotating shaft 415 to rotate the stirring device 413. However, in order to collect the solid matter in the collection case 407, the stirring device 413 rotates gently in one direction so as not to generate a flow that hinders the sedimentation of the solid matter such as a flocculant.

  Furthermore, a partition 418 is provided in the liquid tank 40 so that the upper end of the liquid tank 40 is slightly lower than the liquid level in the tank (symbol ▽ position in FIG. 5). A part of the pool is partitioned. A filter 419 is provided at a portion partitioned by the partition wall 41, and the supernatant liquid of the cleaning liquid in the liquid tank 40 is supplied to the liquid supply unit 50 described later via the filter 419. For example, in cleaning heavy metal contaminated soil, the filter 419 is made of a chelate resin, an ion exchange resin, or the like, and functions to adsorb water-soluble contaminants.

  Further, as shown in FIG. 5, a flocculant supply unit 421 is provided on the top plate 400 via a stand 422. The flocculant supply unit 421 includes the flocculant tank 423 storing the flocculant described above, the upper end connected to the lower part of the flocculant tank 423, and the other end facing the liquid tank 40, and the flocculant tank 423 receives the flocculant in the flocculant tank 423. A tube hose 425 led into the liquid tank 40 and a cock 424 with an electromagnetic valve provided in the middle of the tube hose 425 are provided. Although not particularly illustrated, an impeller-type flow rate is provided in the middle of the tube hose 425. A total is provided. The flow rate is detected by the number of rotations of the flow meter, and the amount of dripping of the flocculant is controlled by controlling the excitation time of the cock 424 with a solenoid valve. As described above, the dripping amount of the flocculant is determined by the inflow amount of the cleaning liquid into the liquid tank 40 detected by the flow meter 404 provided in the inflow conduit 401. The flocculant to be added varies depending on the target pollutant. For example, in the case of heavy metals, chelating agents such as chelating fibers or chelating resins are examples.

  The configuration of the liquid supply unit 41 described above will be described with reference to FIG. 3. 44 is a pump for sending the cleaning liquid in the liquid tank 40 to the processing mechanism unit 15, and 45 is provided on the pump 44 and the bottom plate 46 of the liquid tank 40. The suction pipe 45 is connected to a drain port (not shown), and the suction pipe 45 is connected to a region defined by the partition wall 418 in the liquid tank 40 via the filter 419. Reference numeral 47 denotes a water supply pipe connected to a discharge port (not shown) of the pump 44. The water supply pipe 47 is branched into two water supply pipes 49 via a joint 48 (see also FIG. 4). These water supply pipes 49 are disposed at the lower part of both side surfaces in the width direction of a processing tank 53 (described later) of the processing mechanism unit 15, and a plurality of water supply holes 50 facing the processing tank 53 are provided on the side surfaces at a predetermined pitch. It has been. The pump 44 is of a known configuration (for example, a spiral pump), and the cleaning liquid from the suction pipe 45 is discharged to the water supply pipe 47 by a directly connected drive device (electric motor or the like) 52, and further the water supply pipe The cleaning liquid is supplied into the treatment tank 53 through 49 and its water supply hole 50.

6 is a side sectional view showing the detailed structure of the processing mechanism section 15 constituting the soil purification apparatus of the present invention, FIG. 7 is a sectional view taken along the arrow VII-VII in FIG. 6, and FIG. 8 is a sectional view taken along the arrow VIII-VIII in FIG. It is sectional drawing. In these FIG. 6 thru | or FIG. 8, the same code | symbol is attached | subjected to the part similar to each previous figure, and description is abbreviate | omitted.
6 to 8, reference numeral 53 denotes a processing tank forming the main body of the processing mechanism unit 15, and this processing tank 53 is supported substantially horizontally on the center in the longitudinal direction of the main body frame 7 via a support member 54. 55 is an inlet provided in the upper part on the front side of the processing tank 53 for introducing earth and sand from the transfer conveyor 21, 56 is an outlet provided in the lower part on the rear side of the processing tank 53. Except for the mouth 55 and the discharge port 56, it has a watertight structure, and its lower side is formed in a substantially arc-shaped cross section along the rotation locus of a paddle mixer 58 (described later) as shown in FIG. . A water level sensor 57 is provided on the inner wall of the processing tank 53 and serves as a water level detecting means for detecting the water level of the cleaning liquid stored in the processing tank 53.

  58 is a paddle mixer provided in the processing tank 53. The paddle mixer 58 includes a rotating shaft 59 inserted in the longitudinal direction of the processing tank 53 (left and right direction in FIG. 6), and a plurality of radial shafts provided on the rotating shaft 59. It comprises a paddle (stirring blade) 61 fixed to the paddle seat 60, and in the present embodiment, two are provided substantially in parallel. The paddle 61 is fixed to the paddle seat 60 with a bolt or the like, and is configured to be easily exchanged when worn or damaged. The length of the paddle 61 and the distance between the rotary shafts 59 and 59 are set such that the paddles 61 do not touch the counterpart rotary shaft 59 during rotation. Further, as shown in the figure, each paddle 61 is attached to be inclined at a predetermined angle with respect to the rotation direction, so that the paddle mixer 58 crushes and stirs the earth and sand in the treatment tank 53 and simultaneously discharges the discharge port 56. Plays the role of stirring and moving means for transferring in the direction.

  A drive unit housing 62 is provided on the outer wall surface on the front side of the processing tank 53. A bearing 63 for rotatably supporting the vicinity of one end of the rotating shaft 59 is accommodated in the drive unit housing 62 and fixed. Yes. Reference numeral 64 denotes a bearing that rotatably supports the rear end portion of the rotary shaft 59, and this bearing 64 is fixed to the rear outer wall surface of the processing bath 53 via a support member 65. Reference numeral 66 denotes a drive device (hydraulic motor for mixing, which may be electric) that rotates the paddle mixer 58. The output shaft (not shown) of this drive device 66 has a coupling (not shown) at one end of the rotary shaft 59. Are connected through. At this time, the two paddle mixers 58, 58 partially overlap each other as shown in the figure, and the paddles 61 interfere with each other unless they are rotated in reverse at substantially the same number of rotations. In order to rotationally drive the paddle mixers 58 and 58 at substantially the same number of rotations, it is necessary to supply hydraulic oil having substantially the same flow rate to the drive devices 66 and 66. The transmission gears 67 and 67 provided in the first and second gears mesh with each other so that the two paddle mixers 58 and 58 are forced to reversely rotate at substantially the same rotational speed.

  Reference numeral 68 denotes a discharge valve that serves as a discharge door for preventing leakage of earth and sand from the treatment tank 53 to the discharge section 16. In this embodiment, the discharge valve 68 is constituted by a rotary valve. A discharge port 56 of the processing tank 53 and an inlet 76 (described later) of the discharge unit 16 are connected via 68. Although not particularly illustrated, the attachment portion of the discharge valve 68 with respect to the discharge port 56 of the processing tank 53 and the inlet 76 of the discharge portion 16 is sealed with packing or the like so that the cleaning liquid does not overflow to the outside. Thereby, the processing tank 53 and the discharge part 16 are watertightly connected. Reference numeral 69 denotes a drive device (for example, an electric motor) for the discharge valve 68. By rotating the rotor 71 in the discharge valve 68 provided with a plurality of partition walls 70 by the drive device 69, the drive device 69 rotates between the adjacent partition walls 70. The introduced earth and sand in the treatment tank 53 is discharged to the discharge unit 16 by a substantially constant amount.

  As described above, the processing tank 53 has a substantially water-tight structure except for the introduction port 55 and the discharge port 56. However, solid foreign matters mixed into the processing tank 53 due to some reason are caught, and the paddle mixer 58 is smooth. It cannot be said that there is no possibility of hindering proper operation. Furthermore, since the paddle 61 (described later) is worn out when used for a long period of time, it needs to be repaired or replaced as appropriate. From the above, a maintenance door (not shown) is provided on the upper surface of the processing tank 53 for the internal inspection or repair of the processing tank 53 and can be attached and detached by bolts or the like. Reference numeral 72 denotes a maintenance drain provided at the lower portion of the front side wall surface of the treatment tank 53. For maintenance, for example, an on-off valve 73 using a ball valve or the like is operated to operate the maintenance drain 72. The earth and sand (fine particles) in the treatment tank 53 and the suspended cleaning liquid can be positively discharged.

  With the above configuration, in the processing mechanism unit 15, the paddle mixer 58 is rotationally driven by the driving device 66, the contaminated soil is transferred to the discharge side while being stirred and cleaned in the cleaning liquid, and the discharge valve 68 is appropriately driven. The earth and sand subjected to the cleaning process are led out to the discharge unit 16 through the discharge port 56.

FIG. 9 is a side sectional view showing a detailed structure of the discharge unit 16 constituting one embodiment of the soil purification apparatus of the present invention. In FIG. 9, parts similar to those in the previous drawings are given the same reference numerals. The description is omitted.
As shown in FIG. 9, the discharge unit 16 is a discharge unit for discharging the earth and sand discharged from the processing mechanism unit 15 to the outside of the machine, and a screw conveyor 74 is used in the present embodiment. . 75 is a substantially cylindrical casing constituting the main body of the screw conveyor 74, and on the upstream side of the casing 75 in the transfer direction (left side in FIG. 9), as described above, the discharge valve 68 is connected to the discharge port 56 of the processing tank 53. An upward inlet 76 that is water-tightly connected via the bottom is provided, and a downward outlet 77 is provided on the downstream side (right side in FIG. 9). At this time, the casing 75 transfers the earth and sand from the lower position of the processing mechanism unit 15 so that the height position of the outlet 77 is higher than the cleaning liquid level in the processing tank 53 (symbol ▽ position in FIG. 9). It is arranged in an upward slope in the direction (right direction in FIG. 9).

  Reference numerals 78 and 79 denote end brackets provided at both ends of the casing 75, and reference numerals 80 and 81 denote bearings attached to the end brackets 78 and 79 via support members 82 and 83, respectively. Reference numeral 84 denotes a hollow (may be solid) rotating shaft provided in the casing 75, and both ends of the rotating shaft 84 are rotatably supported by bearings 80 and 81. Reference numeral 85 denotes a screw (auger) spirally provided on the outer periphery of the rotating shaft 84. Reference numeral 86 denotes a drive device for the screw conveyor 74 (a discharge hydraulic motor, which may be electric), and this drive device 86 is supported by the end bracket 79 via the cylindrical support member 83. Reference numeral 87 denotes a coupling for connecting the output shaft of the drive device 86 and the rotary shaft 84 in the support member 83. Via this coupling 87, the driving force of the drive device 86 is transmitted to the rotary shaft 84, and the screw 85 is It is designed to rotate.

  With the above configuration, the screw conveyor 74 conveys only the soil and sand from the processing mechanism unit 15 that has been subjected to the cleaning process while dehydrating without leaking the cleaning liquid in the processing tank 53, and discharges it to the outside through the outlet 77. It has become.

  Returning to FIG. 1, 88 is a power unit (power unit) of the soil purification apparatus of the present invention, and this power unit 88 is supported on the other side in the longitudinal direction of the main body frame 7 through the support posts 11 and 12 and the support member 13. ing. The power unit 88 houses an engine serving as a power source, at least one hydraulic pump driven by the engine, and a plurality of control valves for switching and supplying hydraulic oil discharged from the hydraulic pump to each driving unit. ing. Although not particularly shown, a support member for suspending and supporting the casing 75 of the screw conveyor 74 is provided on the rear side of the power unit 88.

  Reference numeral 89 denotes a driver's seat on which an operator is boarded. The driver's seat 89 is provided in a region on the front side of the power unit 88 on the support member 13. Reference numeral 90 denotes an operating lever for driving operation arranged in the driver seat 89. By operating the operating lever 90, a control valve in the power unit 88 for switching and supplying hydraulic oil to the driving device for driving 5 is switched. The soil purification apparatus is operated for running.

  91 is an operation panel for performing various settings and operations related to the operation of the soil purification apparatus, and this operation panel 91 is directly supported on the other side in the longitudinal direction of the main body frame 7. Inside this operation panel 91, detection signals from sensors provided in various places of the soil purification device and operation signals corresponding to operations from the operation panel 91 are input, and each hydraulic drive except the driving device 5 for traveling is input. A control device 92 (see FIG. 10) is provided that outputs a command signal corresponding to an input signal to a control valve corresponding to the device or other electric drive device.

FIG. 10 is a block diagram showing a schematic configuration of the control device 92 provided in the soil purification apparatus of the present invention.
In FIG. 10, 93 is an input unit for inputting detection signals from sensors and operation signals from the operation panel 91 and converting them into digital signals, and 94 is a read-only storage for storing control procedure programs, constants necessary for arithmetic processing, and the like. Memory (ROM), 95 is a timer for measuring time, 96 is a command stored in the ROM 94, and the command signal to the corresponding device (control valve, electric drive device, etc. corresponding to each hydraulic drive device) is calculated. Central processing unit (CPU). Reference numeral 97 denotes a random access memory (RAM) that temporarily stores calculation results of the CPU 96 and numerical values during the calculation, and 98 denotes an output unit that converts the command signal calculated by the CPU 96 into an analog signal and outputs it to a corresponding device.

Next, operation | movement and an effect | action of the soil purification apparatus of this Embodiment of the said structure are demonstrated.
For example, when excavating contaminated soil containing specific harmful substances such as heavy oil, volatile organic compounds, or heavy metals such as hexavalent chromium and lead with a hydraulic excavator, etc. Foreign matter and the like larger than the eyes of the lattice 26 are removed by the vertical vibration of the sieving device 19, and the earth and sand components smaller than the eyes of the lattice 26 are temporarily stored in the hopper 20. The earth and sand placed on the conveyor belt 35 of the conveyor 21 in the hopper 20 is cut out of the hopper 20 by the conveyor belt 35 that is circulated and supplied to the treatment tank 53.

  On the other hand, the cleaning liquid supplied from the cleaning liquid supply unit 18 is stored in the processing tank 53. The water level of the cleaning liquid in the treatment tank 53 is detected by the water level sensor 57 and the detection signal is input to the control device 92. The control device 92 calculates the water level of the cleaning liquid in the processing tank 53 by the CPU 96 based on the detection signal from the water level sensor 57 converted into a digital signal via the input unit 93. Then, the CPU 96 determines the excess or deficiency of the cleaning liquid by comparing the calculation result with the set water level stored in advance in the ROM 94. When the water level of the cleaning liquid is lower than the set water level, the driving of the cleaning liquid supply unit 18 is performed. A command signal (drive signal) is output to the device 52, the pump 44 is driven until the cleaning liquid in the processing tank 53 returns to the set water level, and the cleaning liquid in the storage tank 40 is processed via the water supply pipe 47 and the water spray pipe 49. Supply in 53.

  In the treatment tank 53, the paddle mixer 58 agitates and cleans the earth and sand in the washing liquid maintained at the set water level as described above. At this time, if the paddle mixer 58 is appropriately reversed, a higher cleaning effect can be obtained. The earth and sand washed in the treatment tank 53 is transferred to the discharge port 56 side, led out into the screw conveyor 74 through the discharge valve 68, and discharged while being dehydrated by the screw conveyor 74.

  In the treatment tank 53, fine particles of soil and sand having a high contamination concentration separated from the coarse particles of soil and sand by stirring and cleaning by the paddle mixer 58 float in a suspended state in the cleaning liquid. However, since the processing tank 53 and the screw conveyor 74 are hermetically connected, and the outlet 77 of the screw conveyor 74 is provided at a position higher than the water level of the cleaning liquid, the cleaning liquid leaks out of the processing tank 53. The only thing that is discharged out of the machine by the screw conveyor 74 is the coarse particles of earth and sand that have been washed to a sufficient level. Therefore, fine particles having a high contamination concentration are not discharged out of the machine.

  At this time, since the strainer 402 is provided at a position slightly lower than the water level of the cleaning liquid in the processing tank 53, the cleaning liquid near the liquid surface in the processing tank 53 passes through the circulation conduit 401 and is supplied to the cleaning liquid supply unit 18. Is returned to the liquid tank 40. When the detection signal from the flow meter 404 is input, the control device 92 excites and opens the cock 424 with a solenoid valve of the flocculant supply device 421 to supply the flocculant into the liquid tank 40. The control device 92 calculates a supply amount of the coagulant according to the circulating flow rate of the cleaning liquid to the liquid tank 40 based on the detection signal from the flow meter 404 by the CPU 96 and a flow meter (not shown) attached to the tube hose 425. When the supply amount of the flocculant actually supplied into the liquid tank 40 reaches the required amount based on the detection signal from the above, the cock 424 with the electromagnetic valve is closed and the supply of the flocculant is stopped. Generally, since the addition rate of the flocculant is about 0.1%, such intermittent flocculant supply is sufficient. However, when the flocculant is continuously added, the cock 424 with a solenoid valve is proportional. An electromagnetic solenoid valve may be used, and the opening of the cock 424 with a solenoid valve may be adjusted according to the detection signal of the flow meter 404.

  In the liquid tank 40, the cleaning liquid is gently stirred by the stirring device 413, and the supplied flocculant is uniformly distributed in the cleaning liquid. As a result, the pollutant floating in the cleaning liquid returned from the treatment tank 53, or fine particles of earth and sand containing the same are adsorbed (collected) to the flocculant, and the silk-like floating substance called floss Form. In the forced stirring state, the floss is hindered by the flow rising at a flow rate faster than the settling velocity, and in this example, the stirrer 413 is set so as not to hinder the floss settling. Then, it settles smoothly and is accommodated in the collection case 407. The solid content including the floss precipitated in the recovery case 407 is recovered by closing the butterfly valve 409 and removing the recovery case 407. In addition, solids or water-soluble contaminants that are not collected in the collection case 407 but remain in the cleaning liquid are prevented from flowing into the suction pipe 45 by the partition 418. Collected by 419. A clean cleaning liquid is always supplied to the processing tank 53 by the action of the cleaning liquid purification means.

  Further, when the amount of fine particles floating increases as the processing progresses and the contamination concentration of the cleaning liquid in the processing tank 53 increases, the ball valve 73 is opened and the drain port 72 described above is opened. The cleaning liquid in the tank 53 is drained. At this time, for example, it is more preferable to connect the drain outlet 72 to a separately provided sewage tank. In this case, the cleaning liquid can be extracted without secondarily contaminating the surrounding soil. The cleaning liquid in the liquid tank 40 can also be drained by opening the ball valve 412 provided in the recovery case 407 at the time of replacement or maintenance. A drive motor that opens and closes the butterfly valve 409 and the ball valve 412 of the liquid tank 40 may be provided separately, and the opening and closing of the butterfly valve 409 and the ball valve 412 may be automated using this drive motor.

  Here, in general, in order to wash contaminated soil, processing conditions such as the type of washing liquid, stirring speed, and washing time are examined in advance according to the state of the contaminated soil, and the treatment conditions suitable for the contaminated soil to be treated are determined. Must be selected. If the contaminated soil to be treated can be cleaned relatively easily depending on the degree of contamination and the nature of the sand and sand, the screw 44 is appropriately operated as described above to maintain the water level of the cleaning liquid in the processing tank 53, and the screw. By sequentially loading the earth and sand while all the conveyor 74, the discharge valve 68, the paddle mixer 58, the conveyor 21 and the sieve device 19 are driven, the supply of contaminated soil, the cleaning process, and the discharge of the clean soil are sequentially performed. Processing can be performed.

  However, among the above processing conditions, the stirring speed can be adjusted relatively easily by giving a command to a corresponding control valve in the power unit 88 to drive and control the driving device 66 of the paddle mixer 58. Is difficult to control as set. Therefore, for example, in the case where sediments that require a sufficient residence time (cleaning time) in the treatment tank 53, such as those having a high contamination concentration, highly viscous sediments, or fine-grained sediments, are treated as follows. Batch processing is performed as follows.

FIG. 11 is a flowchart illustrating an example of a control procedure by the control device 92 when batch processing is performed using the soil purification device of the present embodiment.
When performing batch processing, as shown in FIG. 11, the control device 92 first, in step 101, the processing conditions such as the stirring speed, the processing time, and the amount of processing soil and sand input by the operation panel 91. Is input via the input unit 93, converted into a digital signal, and stored in the RAM 97. In the subsequent step 102, it is determined whether or not the operation start operation has been performed by the operation panel 91, and it is confirmed that the operation start operation signal has been input, and the procedure proceeds to step 103. At this time, at least the transport conveyor 21 is stopped, and the sieve device 19 is also stopped if the earth and sand has been charged into the hopper 20.

  In step 103, a command signal for instructing stop to the driving device 69 (see FIG. 6) of the discharge valve 68 is output, and the transfer of earth and sand from the processing tank 53 to the screw conveyor 74 is stopped. At this time, if it is assumed that the treated earth and sand remain in the treatment tank 53, the mixing is performed so that the earth and sand in the treatment tank 53 is almost led out to the screw conveyor 74 before the discharge valve 68 is stopped. A command signal is output to the drive device 66 (strictly, the corresponding control valve) to drive the paddle mixer 58 in the normal direction, and the time required for the sediment 95 in the processing tank 53 to be discharged by the paddle mixer 58 by the timer 95 (ROM 94). It is advisable to stop the discharge valve 68 after measuring time for the set value stored in (1). Then, the procedure is shifted to step 104, and in conjunction with the stop of the discharge valve 68, a command signal instructing the stop to the discharge drive device 86 (see FIG. 9) is output to stop the discharge of earth and sand.

  In the following step 105, a command signal for instructing activation is output to the conveying drive device 36 (strictly, its control valve), and the conveying conveyor 21 is driven. The command signal for instructing activation at this time is calculated by the CPU 96 so as to drive the transport driving device 36 at the set transport speed based on the transport speed input in step 101, and converted into an analog signal via the output unit 98. Is output. Further, the driving time of the conveyor 21 is calculated so that a predetermined amount of earth and sand is introduced into the processing tank 53 by the conveyor 21 based on the conveying speed and the amount of earth and sand. When time is measured by the timer 95 for the calculated drive time, in step 106, a command signal for instructing the stop is output to the transport drive device 36, and the transport conveyor 21 is stopped. As a result, the amount of treated earth and sand set in step 101 is introduced into the treatment tank 53. In order to smoothly introduce earth and sand, while the earth and sand are being supplied by the earth and sand conveyor 21, the paddle mixer 58 is driven to rotate forward so that the earth and sand are distributed as uniformly as possible in the treatment tank 53. It is also possible. Although omitted in FIG. 11, the control device 92 controls the drive of the pump 44 (see FIG. 3) based on the detection signal of the water level sensor 57 (see FIG. 6) as described above. The water level of the cleaning liquid is maintained almost constant.

  When the introduction of the earth and sand into the processing tank 53 is completed, the procedure is moved to the next step 107, a command signal for alternately instructing forward / reverse rotation is output to the mixing drive device 66, and the paddle mixer 58 is only supplied for a predetermined time. Repeat the forward / reverse drive. At this time, the command signal to the mixing driving device 66 is calculated by the CPU 96 so that the paddle mixer 58 is driven at the stirring speed inputted in Step 101, and the driving time of the paddle mixer 58 during this time is inputted in Step 101. The time is measured by the timer 95 during the stirring time. During this time, the earth and sand in the treatment tank 53 is repeatedly stirred and washed in the washing liquid by the paddle mixer 58, and the contained contaminants separate from the earth and sand and move into the washing liquid.

  When the stirring time set in step 101 is measured by the timer 95, the CPU 96 outputs a command signal instructing activation to the discharging drive device 86 in step 108, and makes the screw conveyor 74 stand by in a driving state. In conjunction with this, the procedure is shifted to step 109, a command signal for instructing activation is output to the driving device 69 (see FIG. 6), the discharge valve 68 is driven, and the earth and sand in the processing tank 53 is removed by the screw conveyor 74. To derive. At the next step 110, the CPU 96 switches the output from the command signal that repeatedly commands forward / reverse rotation of the mixing drive device 66 to the command signal that commands only forward rotation. Then, the paddle mixer 58 is continuously driven in the normal direction to positively transfer the earth and sand in the treatment tank 53 to the discharge side. Thereby, the processing earth and sand in the processing tank 53 is discharged | emitted by the screw conveyor 74 outside the apparatus.

  In step 111, the CPU 96 confirms whether or not the batch processing end operation has been performed by the operation panel 91. If an operation signal for instructing the processing end is input, the paddle mixer 58, the discharge valve 68, and the screw conveyor 74 are sequentially operated. Stop driving and complete the above procedure. On the other hand, the time required for the sediment discharge procedure in steps 108 to 110 can be roughly determined by the amount of treated sediment input in step 101 and the driving speeds of the paddle mixer 58, the discharge valve 68, and the screw conveyor 74. Therefore, the CPU 96 returns the procedure to Step 103 when the operation signal for finishing the batch processing is not input even if the time is measured by the timer for the time set in accordance with the input amount of the processing earth and sand. The procedure up to 111 is performed again (the next one batch process is started). However, the shift to the next batch processing may be manually instructed by operating the operation panel 91 without being configured to be automatically determined by the control device 92.

  In the present example, the above-described one batch refers to processing for one cycle from the above steps 103 to 111. In addition, when the batch processing is repeated several times without ending the batch processing in the above step 111, it is assumed that there is a shortage of earth and sand in the hopper 20, but in this case, for example, the step It is conceivable to save the setting 101 so that the processing can be interrupted, and during that time, the sieving device 19 is manually activated to supply the processing target soil to the hopper 20.

  According to the embodiment of the soil purification apparatus of the present invention described above, the circulation line 401 is provided, the cleaning liquid used in the treatment tank 53 is returned to the liquid tank, and the flocculant supply device 421, the recovery case 407, the filter 419 and the like are used. An external water source is obtained by removing contaminants floating in the used cleaning liquid, fine particles of earth and sand containing the contaminant, other foreign matters, etc., and supplying the processing tank 53 again as a clean cleaning liquid. In this case, the contaminated soil can be efficiently cleaned with the minimum required cleaning liquid.

  In addition, by arranging the devices constituting the contaminated soil supply unit 14, the processing mechanism unit 15, the discharge unit 16, and the like on the main body frame 7, the cleaning processing facility that has conventionally been a fixed type can be used as a traveling body. 1 so that the vehicle can travel on its own in the excavation site.

  Therefore, even when a sufficient installation space cannot be secured, it is possible to work while changing the layout of the cleaning treatment equipment as appropriate within the excavation site according to the progress of the work, so without taking out contaminated soil from the excavation site. In addition, the contaminated soil can be efficiently cleaned by effectively using the space in the excavation site. Even when the soil after treatment is backfilled, the operation lever 90 is operated so that the soil purification device is self-propelled, and the work place is moved to the vicinity of the place where the contaminated soil is excavated by a hydraulic excavator or the like. Work such as backfilling with clean soil is also possible, the burden of earth and sand transportation work from the cleaning work place to the backfill place is reduced, and work efficiency can be greatly improved.

  Further, during batch processing, the discharge device 68 and the screw conveyor 74 are driven in an interlocked manner by the control device 92, so that the drive of the screw conveyor 74 is limited only to discharging soil from the processing tank 53. And energy efficiency during processing can be improved.

  In addition, since the paddle mixer 58 is used, the paddle 61 can sufficiently stir the earth and sand in the treatment tank 53 while being crushed, so that a sufficient cleaning effect can be exhibited.

  In addition, although one Embodiment of the soil purification apparatus of this invention was described as mentioned above, various design changes are possible for the soil purification apparatus of this invention in the range which does not deviate from the technical idea. Below, the representative example is demonstrated one by one.

FIG. 12 is a side view showing the entire configuration of a modified example of the soil purification apparatus of the present invention. In this figure, the same parts as those in the previous drawings are denoted by the same reference numerals and description thereof is omitted.
In FIG. 12, reference numeral 100 denotes a reserve tank that supplies cleaning liquid to be supplied to the cleaning liquid tank 40, and this reserve tank 100 is supported on an extended support frame 13 via a support frame 101. The reserve tank 100 is connected to the water supply port 42 of the liquid tank 40 via the supply line 102 (see also FIG. 13 later). In the embodiment of the soil purification apparatus of the present invention described above, when the absolute amount of the cleaning liquid circulating as the work progresses decreases, the cap 43 of the liquid tank 40 must be removed and replenished as appropriate from the open water supply port 42. However, in this example, the cleaning liquid stored in the reserve tank 100 is automatically supplied to the liquid tank 40.

FIG. 13 is a side view showing a detailed structure in the vicinity of the liquid tank 40 provided in a modification of the soil purification apparatus of the present invention shown in FIG. 12. In this figure, the same parts as those in the previous drawings are the same. Reference numerals are assigned and description is omitted.
In FIG. 13, 103 is a water level sensor provided near the water level of the cleaning liquid in the liquid tank 40 (symbol ▽ position in FIG. 13), 104 and 105 are flowmeters, electromagnetics provided in the middle of the replenishment pipeline 102. It is a cock with a valve. The water level sensor 103, the flow meter 104, and the cock 105 with a solenoid valve are each electrically connected to the control device 92 (see FIG. 10). The control device 92 is based on the detection signal from the flow meter 103. When it is determined that the water level in the liquid tank 40 has fallen below the appropriate range, a command signal for instructing opening to the cock 105 with a solenoid valve is output, and the cleaning liquid in the reserve tank 100 is supplied into the liquid tank 40. This replenishment amount is calculated by the control device 92 based on the detection signal from the flow meter 104, and the control device 92 controls when the deficiency of the cleaning liquid previously calculated based on the detection signal from the water level sensor 103 is reached. The device 92 outputs a command signal for instructing the solenoid valve cock 105 to close, and stops the replenishment of the cleaning liquid. About another point, it is the same as that of one Embodiment of the soil purification apparatus of this invention mentioned above.

  According to this modification, the same effect as that of the embodiment of the soil purification apparatus of the present invention described above is obtained, and even when the circulation amount of the cleaning liquid decreases as the work progresses, the cleaning liquid is automatically insufficient. Since the amount can be supplemented, work efficiency can be further improved. In addition, in this example, the structure which pumps up the used washing | cleaning liquid from the processing tank 53 to a reserve tank is also considered, and it is also considered that the reserve tank 100 is provided with the cleaning liquid purification function.

FIG. 14 is a plan view showing a detailed structure in the vicinity of the cleaning liquid supply unit constituting another modified example of the soil purification apparatus of the present invention. In this figure, the same parts as those in the previous drawings are given the same reference numerals for explanation. Is omitted.
As shown in FIG. 14, this example is an example in which a plurality of liquid tanks 40 are provided. In this example, for example, the main body frame 7 is extended, and one liquid tank 40 is added thereto to add two liquid tanks 40. Are provided in tandem, but three or more may be provided as necessary. In this example, the configuration of the added second liquid tank 40 on the left side in the figure is substantially the same as that of the first liquid tank 40 on the right side in the figure, and the same parts are denoted by the same reference numerals.

  In this example, the circulation conduit 401 is connected to the first liquid tank 40 (the liquid tank 40 on the right side in the figure) through the T-shaped joint (cheese) 106, and the other This branch flow path is connected to a connection pipe line 107 connected to the second liquid tank 40 (the liquid tank 40 on the left side in the figure). Although a water stop valve 108 is provided in the middle of the connecting pipe 107, it may be omitted if unnecessary. On the other hand, although not shown in detail, a T-shaped (cheese) joint is provided in the middle of the suction pipe 45 of the first liquid tank 40, and the suction pipe from the second liquid tank 40 is provided at this joint portion. 109 is connected. About another point, it is the same as that of one Embodiment of the soil purification apparatus of this invention mentioned above.

  With such a configuration, the used cleaning liquid from the processing tank 53 is branched and returned separately to the two liquid tanks 40 to be purified, merged again, and supplied to the processing tank 53. Also in this example, of course, the same effect as that of the embodiment of the soil purification apparatus of the present invention described above can be obtained, and more cleaning liquid is added to the entire circulation system of the cleaning liquid because the liquid tank 40 is added. Since it can be held, the frequency of replenishing the cleaning liquid can be further reduced.

  In the above description, the discharge valve 66 is provided between the processing mechanism unit 15 and the discharge unit 16 and the configuration in which the discharge valve 66 is interlocked with the screw feeder 74 at the time of batch processing has been described. It may be configured to be manually operated individually. In addition, for example, even if soil that has not been sufficiently cleaned flows into the screw conveyor 74 from the processing mechanism unit 15 to some extent, it does not necessarily need to be provided with the discharge valve 68. In this case, steps 107 and 109 in FIG. 11 may be omitted during batch processing, and the drive device 86 of the screw conveyor 74 may be controlled independently. In these cases, the same effect is obtained.

  Further, although the screw conveyor 74 has been described as an example of the earth and sand discharge means after the treatment, the point is that the earth and sand from the treatment tank 53 can be leak-tightly connected to the discharge port 56 of the treatment tank 53 and the cleaning liquid. There is no particular limitation on the mode of the discharging means as long as the high-moisture content earth and sand stirred therein can be carried out. Therefore, for example, a so-called bucket conveyor or a pressure pump can be applied. In this case, the same effect can be obtained.

  Moreover, although the example which provided the vibration-type sieving apparatus 19 was demonstrated above, for example, the earth and sand of the property which is comparatively easy to process, such as earth and sand with a small amount of mixing of a foreign material, and earth with low viscosity, are made into a processing object In such cases, it may be replaced with a fixed sieve, or may be omitted if unnecessary. Furthermore, in the processing mechanism unit 15, the example in which two paddle mixers 58 are provided as the earth and sand agitation and transfer means has been described, but the number is not limited, and may be one or three or more. Moreover, although the hopper 20 was mentioned as an example as a means for receiving input earth and sand, for example, a chute or the like may be used instead. Further, the present invention is not necessarily limited to the paddle mixer 58. For example, a so-called screw mixer may be used instead of the paddle mixer 58. Furthermore, although the conveyance conveyor 21 was used as a means for conveying earth and sand from the hopper 20 to the processing mechanism unit 15, for example, a screw conveyor or the like may be used instead. In these cases, the same effect can be obtained.

It is a side view which shows the whole structure of one Embodiment of the soil purification apparatus of this invention. It is a side view which shows the detailed structure of the earth and sand supply part which comprises one embodiment of the soil purification apparatus of this invention. It is a side view which shows the detailed structure of the washing | cleaning liquid supply part which comprises one embodiment of the soil purification apparatus of this invention. It is a top view which shows the detailed structure of the washing | cleaning liquid supply part which comprises one embodiment of the soil purification apparatus of this invention. It is a side view which shows the detail of the liquid tank with which the washing | cleaning liquid supply part which comprises one embodiment of the soil purification apparatus of this invention was equipped. It is a sectional side view showing the detailed structure of the processing mechanism part which comprises the soil purification apparatus of this invention. It is a VII-VII arrow sectional view of Drawing 6 showing the detailed structure of the processing mechanism part which constitutes the soil purification apparatus of the present invention. It is VIII-VIII arrow sectional drawing of FIG. 6 showing the detailed structure of the process mechanism part which comprises the soil purification apparatus of this invention. It is a sectional side view which shows the detailed structure of the discharge part which comprises one embodiment of the soil purification apparatus of this invention. It is a block diagram showing schematic structure of the control apparatus with which the soil purification apparatus of this invention was equipped. It is a flowchart showing an example of the control procedure by the control apparatus in the case of batch-processing using the soil purification apparatus of this invention. It is a side view showing the whole structure of the modification of the soil purification apparatus of this invention. It is a side view showing the detailed structure of the liquid tank vicinity with which the modification of the soil purification apparatus of this invention was equipped. It is a top view showing the detailed structure of the washing | cleaning liquid supply part vicinity which comprises the other modification of the soil purification apparatus of this invention.

Explanation of symbols

1 Traveling body (traveling means)
7 Main body frame 15 Processing mechanism section 16 Discharge section 17 Sediment supply section 18 Cleaning liquid supply section 40 Liquid tank 41 Liquid supply section and 57 Water level detection means 58 Paddle mixer 88 Power unit 92 Control apparatus 401 Circulation line 404 Flow meter (Flow detection means)
407 Collection case (cleaning liquid purification means)
413 Stirrer 419 Filter (cleaning liquid purification means)
421 Coagulant supply device (cleaning liquid purification means)

Claims (11)

A sediment supply section for supplying soil contaminated with pollutants,
A cleaning liquid supply section for supplying a cleaning liquid for earth and sand cleaning;
In the cleaning liquid supplied from the cleaning liquid supply unit, a processing mechanism unit for stirring and cleaning the earth and sand supplied from the earth and sand supply unit,
A discharge unit for discharging the earth and sand washed by the processing mechanism unit to the outside of the machine;
A circulation line for connecting the processing mechanism unit and the cleaning liquid supply unit, and circulating the cleaning liquid used in the processing mechanism unit to the cleaning liquid supply unit;
A soil purification apparatus comprising: cleaning liquid purification means for purifying the cleaning liquid stored in the cleaning liquid supply section. Body frame,
Sediment supply part provided on one side in the longitudinal direction of the main body frame and supplying soil and dirt contaminated with pollutants,
A processing mechanism unit that is provided in the main body frame and is stirred and cleaned in a cleaning liquid storing the earth and sand supplied from the earth and sand supply unit,
A cleaning liquid supply unit that is provided in the main body frame and supplies the cleaning liquid to the processing mechanism unit;
A discharge unit for discharging the earth and sand washed by the processing mechanism unit to the outside of the machine;
A circulation line for connecting the processing mechanism unit and the cleaning liquid supply unit, and circulating the cleaning liquid used in the processing mechanism unit to the cleaning liquid supply unit;
A cleaning liquid purification means for purifying the cleaning liquid stored in the cleaning liquid supply section, provided in the cleaning liquid supply section;
A soil purification apparatus comprising: a stirring device for stirring the cleaning liquid in the cleaning liquid supply unit. Body frame,
Traveling means provided at the bottom of the body frame;
An earth and sand supply unit that is provided on one side in the longitudinal direction of the main body frame and supplies earth and sand contaminated with contaminants;
A processing mechanism unit that is provided in the main body frame, and is stirred and cleaned in a cleaning solution in which the earth and sand supplied from the earth and sand supply unit is stored by a paddle mixer provided inside,
A cleaning liquid supply unit that is provided in the main body frame and supplies the cleaning liquid to the processing mechanism unit;
A discharge unit for discharging the earth and sand washed by the processing mechanism unit to the outside of the machine;
A circulation line for connecting the processing mechanism unit and the cleaning liquid supply unit, and circulating the cleaning liquid used in the processing mechanism unit to the cleaning liquid supply unit;
Cleaning liquid purification means for purifying the cleaning liquid stored in the cleaning liquid supply section, provided in the cleaning liquid supply section;
A power unit provided on the other longitudinal side of the main body frame;
A soil purification apparatus, comprising: a stirring device that stirs the cleaning liquid in the cleaning liquid supply unit.   A water level detecting means for detecting the water level of the cleaning liquid in the processing mechanism section, and a control device for controlling the cleaning liquid supply section so as to keep the water level in the processing mechanism section based on a detection signal from the water level detecting means. The soil purification apparatus according to any one of claims 1 to 3.   The soil purification apparatus according to any one of claims 1 to 4, wherein the cleaning liquid purification means includes a flocculant supply device that supplies a flocculant that aggregates solid matter floating in the cleaning liquid.   A flow rate detecting means for detecting a flow rate of the cleaning liquid flowing through the circulation pipe, and a control device for controlling the coagulant supply amount of the coagulant supply apparatus in accordance with a detection signal from the flow rate detection means. The soil purification apparatus of Claim 5.   The soil cleaning apparatus according to any one of claims 1 to 6, wherein the cleaning liquid purification means includes a recovery case for recovering solid matter precipitated in the cleaning liquid.   The soil recovery apparatus according to claim 7, wherein the recovery case is detachably provided in the cleaning liquid supply unit.   The soil purification apparatus according to any one of claims 1 to 8, wherein the cleaning liquid purification means includes a filter that adsorbs contaminants floating in the cleaning liquid. A liquid tank for storing cleaning liquid for earth and sand cleaning;
A liquid supply unit that supplies the cleaning liquid stored in the liquid tank to the processing mechanism unit;
A circulation line for connecting the processing mechanism unit and the liquid tank, and circulating the cleaning liquid used in the processing mechanism unit to the liquid tank;
A cleaning liquid circulating apparatus comprising cleaning liquid purifying means for purifying the cleaning liquid stored in the liquid tank. A liquid tank for storing cleaning liquid for earth and sand cleaning;
A liquid supply unit that supplies the cleaning liquid stored in the liquid tank to the processing mechanism unit;
A circulation line for connecting the processing mechanism unit and the liquid tank, and circulating the cleaning liquid used in the processing mechanism unit to the liquid tank;
Cleaning liquid purification means for purifying the cleaning liquid stored in the liquid tank;
A cleaning liquid circulating apparatus comprising: an agitating device for agitating the cleaning liquid in the liquid tank.

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