JP4968546B2 - Magnetic separation device - Google Patents

Description

  The present invention relates to a magnetic separation device, and more particularly, to a technique for separating and removing magnetic flocs in raw water by attracting them to a magnetic disk.

  As an apparatus for removing pollutants existing in raw water such as sewage and factory effluent, there is a magnetic separation apparatus as shown in Patent Document 1, for example. In this magnetic separation device, a flocculant and magnetic powder are added to raw water to form a pollutant as a magnetic floc with magnetism, and the magnetic floc is adsorbed on a magnetic disk and removed from the raw water. is there. That is, a plurality of magnetic disks in which a large number of magnets are arranged are provided in the separation tank at intervals with respect to the rotating shaft, and magnetic flocs in the raw water are attracted and collected on the magnetic disk by the magnetic force of the magnets. The magnetic floc attracted and collected on the magnetic disk is scraped off by a scraper or the like and discharged out of the apparatus.

  However, it is possible to tilt the trough and discharge the magnetic flocs under natural flow, but if the trough tilt angle cannot be taken, or the water level of the separation tank is raised to increase the efficiency of magnetic separation, In the case where the inclination angle has to be made shallow, magnetic flocs are likely to be deposited in the trough.

In order to prevent such accumulation on the trough, a magnetic flock discharging means for forcibly discharging the magnetic flock is required. For example, a method of providing a screw conveyor in the trough can be considered.
Japanese Patent Laid-Open No. 10-244424

  However, since the magnetic separation device has a plurality of magnetic disks (for example, about 15 to 20) on the rotating shaft, a trough having a screw conveyor (hereinafter referred to as a screw trough) between the magnetic disks. ) Must be placed respectively. When magnetic force is also formed on the outer surface of the magnetic disk located at both ends of the rotating shaft, screw troughs may be arranged outside the magnetic disk located at both ends.

  Therefore, if a motor is provided for each screw conveyor, there is a problem that the running cost due to the motor power cost increases. Furthermore, if a motor is provided for each screw conveyor, there is also a problem that an arrangement space for arranging a large number of motors must be secured.

  As a countermeasure, a drive pulley is provided for each screw conveyor, and an endless timing belt is suspended between each driven pulley and the motor drive pulley. It is possible to distribute.

  However, in this belt drive system, when the number of magnetic disks increases as described above, and a large number of screw conveyors are arranged accordingly, the problem of motor overload due to an increase in belt tension and motor power are There arises a problem that it is not distributed evenly.

  In addition, the screw trough must be accurately positioned and adjusted at an intermediate position between the magnetic disks. The timing belt slips due to the loosening of the timing belt caused by the positioning adjustment, etc., and the motor driving force is accurately adjusted. The problem of not being transmitted to the conveyor is also likely to occur. Therefore, it is difficult to achieve both positioning adjustment and a belt drive system. When priority is given to positioning adjustment, a motor must be provided for each screw trough.

  The present invention has been made in view of such circumstances, and has magnetic flock discharge means that can accurately drive a number of screw conveyors with one motor while having a positioning adjustment function for each screw trough. An object is to provide a magnetic separation device.

  In order to achieve the above object, the first aspect of the present invention provides a predetermined interval between the apparatus main body including a separation tank into which raw water containing magnetic floc flows and a rotation shaft disposed in the separation tank. A plurality of magnetic disks that are arranged in parallel to adsorb the magnetic flocs by magnetic force, scraping means for scraping off the magnetic flocs adsorbed to the magnetic disks, and a trough-like trough between the magnetic disks A magnetic floc discharge means for forcibly discharging the scraped magnetic floc out of the separation tank by disposing screw troughs each having a screw conveyor therein, A base plate that is supported in the apparatus body and provided in the vertical direction and in which the screw trough mounting openings are respectively formed in the horizontal direction; A mounting plate having a positioning adjustment mechanism capable of detachably attaching the screw trough to each mounting opening of the steel plate and adjusting the mounting position in the lateral direction, and a rotating shaft of the screw conveyor passing through the mounting plate A screw trough unit integrally formed as a unit with a driven pulley provided at an end and an idler rotatably supported by the mounting plate and disposed near the pulley; and the mounting opening of the base plate The drive force of the motor with the endless timing belt suspended between the drive pulley and the support pulley of one motor is sandwiched between the driven pulley and idler of each screw trough unit attached to the section. A belt drive mechanism that transmits to the screw conveyor of each screw trough unit. To provide a magnetic separation device according to claim.

  Although the screw trough is arranged between the magnetic disks, when magnetic force is also formed on the outer surface of the magnetic disk positioned at both ends of the rotating shaft, the screw is also mounted on the outer side of the magnetic disk positioned at both ends. A trough may be arranged.

  According to the first aspect, a screw trough unit in which screw troughs are unitized one by one is formed so that the screw trough can be detachably attached to the base plate, and the attachment position to the base plate is set in the lateral direction by the positioning adjustment mechanism. Adjustable. Accordingly, the screw trough can be accurately positioned and installed at an intermediate position between the magnetic disks. Furthermore, even when one screw trough breaks down, it can be easily removed from the apparatus main body.

  According to the first aspect of the present invention, a driven pulley and an idler for rotating the screw conveyor are provided on the mounting plate of the screw trough unit, and the timing belt suspended between the driving pulley and the supporting pulley of the motor is sandwiched. Thus, the timing belt does not slip even when the tension of the timing belt is loosened due to the positioning adjustment. This makes it possible to achieve both positioning adjustment and a belt drive system. Therefore, the present invention can accurately drive a large number of screw conveyors with one motor while having a positioning adjustment function for each screw trough.

  As an aspect of the present invention, the positioning adjusting mechanism includes a plurality of lateral elongated holes formed in the mounting plate, and a fixing jig that attaches and fixes the mounting plate to the base plate through the elongated holes. It is preferable to consist of.

  As a result, a mechanism for positioning and adjusting the screw trough and a mechanism for attaching and detaching the screw trough to and from the base plate can be configured with a simple configuration. As the fixing jig, a combination of a bolt and a nut or a combination of a female screw and a bolt formed on the base plate can be suitably used.

  As an aspect of the present invention, the magnetic disk is preferably in the range of 5 to 50 sheets. This is because when the number of magnetic disks is as large as 5 to 50, the magnetic floc discharging means in the present invention exhibits a greater effect.

  As described above, according to the magnetic separation device of the present invention, it is possible to accurately drive a large number of screw conveyors with one motor while having a positioning adjustment function for each screw trough.

  As a result, the screw trough positioning mechanism and the belt drive system can be made compatible with each other, so that not only can the running cost be significantly increased compared to the case where a motor is provided for each screw conveyor, but also the motor installation space. It is not necessary to secure a large.

  Hereinafter, preferred embodiments of a magnetic separation device according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an embodiment of the magnetic separation device of the present invention, FIG. 2 is a side sectional view, and FIG. 3 is a front sectional view. In FIG. 3, only the configuration in the vicinity of both end portions of the apparatus is shown, and the central portion is omitted. In the present embodiment, a description will be given of a case where screw troughs are also arranged on the outermost side of a large number of magnetic disks arranged on a rotating shaft.

  The magnetic separation device 10 adsorbs and separates the magnetic floc F in the raw water by magnetic force, and the raw water fed to the magnetic separation device 10 is previously formed with the magnetic floc F by a stirring and aggregating device (not shown). Is done. That is, in the stirring and aggregating apparatus, the magnetic powder and the flocculant are added to the raw water and stirred, so that solid suspended particles, bacteria, plankton, and other contaminants in the raw water are aggregated together with the magnetic powder and the magnetic floc F Form. For example, triiron tetroxide can be preferably used as the magnetic powder. As the flocculant, water-soluble inorganic flocculants such as polyaluminum chloride, iron chloride, ferric sulfate and the like can be preferably used. In addition to the inorganic flocculant, a polymer flocculant may be added to the raw water.

  The raw water containing the magnetic floc F formed in this way is sent to the magnetic separation device 10.

  The magnetic separation apparatus 10 of the present invention has a predetermined interval mainly between an apparatus main body 14 having a separation tank 12 into which raw water containing magnetic floc F flows and a rotary shaft 16 disposed in the separation tank 12. And a plurality of magnetic disks 18 that adsorb the magnetic floc F by magnetic force, a scraper 20 that scrapes off the magnetic floc adsorbed to the magnetic disk 18 (scraping means: see FIG. 6), and the magnetic disks 18 The magnetic trough F is forced out of the separation tank 12 by providing screw troughs 22 with screw conveyors 21 in the trough 19 that receives the magnetic floc F that has been scraped off on the outside of the magnetic disk 18 between and at both ends. And magnetic floc discharging means 24 for discharging automatically. As shown in FIG. 2, the screw trough 22 extends from the position of the rotary shaft 16 of the magnetic disk 18 to a position above the flock collecting tank 28 and is disposed substantially horizontally and scraped into the trough 19. The magnetic flock F is forcibly discharged by the screw conveyor 21.

  The separation tank 12 is formed in a semi-cylindrical shape with an open upper surface (see FIG. 2), and both sides of the semi-cylindrical shape are closed by a pair of side walls 12A and 12A (see FIG. 3). As shown in FIG. 2, overflow tanks 26 and 26 are provided on both sides of the separation tank 12, and a flock recovery tank 28 is provided outside one overflow tank 26. The flock collecting tank 28 is provided on the right side where the magnetic disk 18 rotating in the direction of the arrow enters the raw water. In addition, the discharge path of the treated water that has overflowed into the overflow tank 26 and the discharge path of the magnetic floc F recovered in the flock recovery tank 28 are not shown.

  As shown in FIG. 3, the rotary shaft 16 is rotatably supported by bearings 30, 30 fixed to the pair of side walls 12 </ b> A, 12 </ b> A, and a motor 32 is connected to one end side of the rotary shaft 16. A plurality of magnetic disks 18 having a fitting hole at the center are fitted and supported on the rotary shaft 16 with a predetermined interval. The number of magnetic disks 18 is not particularly limited, but is preferably about 15 to 20 from the viewpoint of efficiently removing the magnetic floc F.

  The magnetic disk 18 is usually formed by embedding a large number of permanent magnet pieces (not shown) on both sides of a disk substrate and fixing a plastic lid (not shown) on the outside.

  As shown in FIG. 3, a sleeve 34 is provided between the magnetic disks 18 to adjust the distance between the magnetic disks 18 and to fix the inner periphery of the magnetic disk 18. The interval between the magnetic disks 18 is preferably set in a range of 1 to 3 times the thickness of the magnetic disk 18. If the interval is less than 1 time, the raw water hardly flows between the magnetic disks 18, and if it is more than 3 times wide, it is difficult to generate a strong magnetic force between the magnetic disks 18. For example, with respect to the thickness of the magnetic disk 18 of 21 mm, the interval between the magnetic disks 18 can be set to 56 mm.

  The plurality of magnetic disks 18 supported by the rotating shaft 16 are preferably submerged in the raw water in the separation tank 12 at a ratio of 1/2 to 2/3. In the case where the magnetic disk 18 is partially submerged in this way, the magnetic floc F adsorbed to the magnetic disk 18 in the raw water is rotated and the magnetic floc F is transported into the atmosphere. When this happens, the scraper 20 and the screw trough 22 collect it. Therefore, it is important to set the submergence rate of the magnetic disk 18 so that the efficiency of adsorption and recovery of the magnetic floc F is the best. For this purpose, for example, a pair of bearings 30 that rotatably support the rotating shaft 16 is supported by a pair of lifting devices (not shown), and the magnetic disk 18 is moved up and down by a hydraulic mechanism or the like so that the submergence rate can be varied. It is also a good method to configure.

  In addition, a rectangular cylindrical water supply port 36 (see FIG. 2) that is long in the axial direction of the rotary shaft 16 is formed at the lower end of the separation tank 12, and the water supply port 36 and the outlet of the agitation and aggregating device described above are connected to the rectangular tube. Connected by a pipe (not shown). A plurality of flow diverting members 38 (see FIGS. 2 and 3) are disposed in the water supply port 36. As shown in FIG. 3, the flow dividing member 38 is disposed directly below each magnetic disk 18 and is formed in a cross-sectional wedge shape whose thickness decreases toward the lower end. Further, as can be seen from FIG. 2, the width dimension of the diversion member 38 is smaller than the width of the water supply port 36, and the left and right sides where the raw water supplied to the water supply port 36 is formed between the water supply port 36 and the diversion member 38. It is comprised so that it may be shunted to the clearance gap. The diverting member 38 causes the raw water supplied from the water supply port 36 to collide with the diverting member 38 and be diverted to the left and right in the radial direction of the magnetic disk 18 as shown in FIG. In this way, the raw water supplied from the water supply port 36 collides with the flow dividing member 38 and is divided into two flows in the left-right direction, whereby the flow velocity of the raw water flowing between the magnetic disks 18 is reduced, and the magnetic disk It rises as a slow upward flow between the 18s. Thereby, the magnetic floc F in the raw water can be efficiently attracted to the magnetic disk 18. In addition, by reducing the upward flow velocity, the magnetic floc F once adsorbed on the magnetic disk 18 is less likely to drop off into the separation tank 12.

  Next, the magnetic floc discharging means 24 for forcibly discharging the scraped magnetic floc F to the floc collecting tank 28 will be described in detail.

  As shown in FIG. 4, the magnetic flock discharging means 24 mainly includes a screw trough unit 40, a base plate 42 to which a plurality of screw trough units 40, 40... Are attached, and a belt that drives the screw conveyor 21 of the screw trough unit 40. And a drive mechanism 44.

  The base plate 42 is supported by the apparatus main body 14 and provided in the vertical direction (see FIG. 2), and a mounting opening 46 (see FIG. 5) of the screw trough unit 40 is formed in the horizontal direction. For example, when 18 screw troughs 22 are provided, 18 attachment openings 46 are formed. The mounting opening 46 may have a hole shape as shown in FIG. 5 or a concave cutout shape cut out from the upper part of the base plate 42.

  As shown in FIG. 5, the screw trough unit 40 has a mounting plate 50 provided with a long hole 58 of a positioning adjustment mechanism 48 capable of detachably attaching the screw trough 22 to the base plate 42 and adjusting the attachment position in the lateral direction. A driven pulley 52 provided at the end of the rotary shaft 21A of the screw conveyor 21 that penetrates the mounting plate 50, an idler 54 that is rotatably supported by the mounting plate 50 and is disposed in proximity to the driven pulley 52, The flow-down pipe 56 (see FIG. 2) is integrally formed as a unit. In addition, the aspect which does not provide the flow-down pipe 56 by opening a flow-down hole at the end of the trough 19 can also be employed. Further, the rotating shaft 21 </ b> A of the screw conveyor 21 is rotatably supported by a bearing (not shown) provided in the penetrating portion of the mounting plate 50. Further, as shown in FIG. 6, the screw trough 22 is a scraper that scrapes off the magnetic floc F adsorbed on the surface of the magnetic disk 18 by forming the upper end of the side wall of the trough 19 in a blade shape (blade shape). 20 is formed integrally with the trough 19.

  The positioning adjustment mechanism 48 may be any mechanism that can adjust the alignment of the mounting plate 50 with respect to the base plate 42 in the lateral direction. For example, the positioning adjustment mechanism 48 is formed on the base plate 42 as shown in FIG. The fixing hole 60 with a female thread, a long hole 58 formed in the mounting plate 50 in the lateral direction, and a bolt 62 screwed into the fixing hole 60 through the long hole 58 can be configured. That is, the long holes 58 are formed in at least four corners of the mounting plate 50, and the fixing holes 60 are formed in the positions of the base plate 42 corresponding to the long holes 58. Then, when the mounting plate 50 is fixed to the base plate 42 by screwing the bolt 62 into the fixing hole 60 through the long hole 58, the mounting plate 50 is laterally moved within the range of the length of the long hole 58. The screw trough 22 is positioned by moving in the direction. A fixing hole that does not engrave an internal thread may be formed in the base plate 42, and a bolt 62 and a nut (not shown) may be screwed together.

  As shown in FIG. 4, the belt drive mechanism 44 includes a driven pulley 52 and an idler 54 of each screw trough unit 40 attached to an attachment opening 46 of the base plate 42, and a drive pulley 66 of one motor 64. The rotational driving force of the motor 64 is transmitted to the screw conveyor 21 of each screw trough unit 40 in a state where the endless timing belt 70 suspended between the support pulley 68 is sandwiched. The motor 64 and the support pulley 68 are preferably provided on the base plate 42. In addition, it is preferable that the belt tensioner 72 is movably provided on the base plate 42 and the tension of the timing belt 70 is appropriately adjusted.

  A large number of teeth are arranged around the pulleys of the drive pulley 66, the support pulley 68, and the plurality of driven pulleys 52 of the motor 64, and the teeth are meshed with the teeth arranged on the inner surface of the timing belt 70. To do. Thereby, the rotational driving force of the motor 64 is transmitted to the screw conveyor 21 of each screw trough unit 40 via the timing belt 70. Further, as the idler 54, a rubber roller can be suitably used.

  Next, a method for attaching the screw trough unit 40 to the base plate 42 and a method for setting the belt drive mechanism 44 to each screw trough unit 40 will be described with reference to FIG.

  First, the screw trough 22 of the screw trough unit 40 is inserted into the mounting opening 46 of the base plate 42 from the outside of the base plate 42 to bring the mounting plate 50 into contact with the base plate 42. Since the downflow pipe 56 becomes an obstacle when the screw trough 22 is inserted, it is preferable that the downflow pipe 56 can be attached to and detached from the trough 19.

  Next, the screw trough unit 40 is temporarily fixed to the base plate 42 by screwing the elongated holes 58 formed at the four corners of the mounting plate 50 into the fixing holes 60 of the base plate 42 through bolts 62.

  Next, the mounting plate 50 is moved laterally so that the screw trough 22 is positioned at an intermediate position between the magnetic disks 18, and in this state, the bolts 62 are tightened to fix the screw trough unit 40 to the base plate 42. Secure completely. This positioning and fixing is performed for all the screw trough units 40. Thereby, each screw trough 22 can be accurately positioned outside the magnetic disk located at the intermediate position and both ends of the magnetic disks 18. Further, even when one screw trough 22 fails, only the failed screw trough unit 40 can be easily removed from the apparatus main body 14 for repair or replacement.

  Next, the timing belt 70 is suspended between the drive pulley 66 of the motor 64 and the support pulley 68, and the driven pulley 52 of each screw trough unit 40 disposed between the drive pulley 66 and the support pulley 68. And the idler 54 sandwich the timing belt 70. The belt tensioner 72 adjusts the tension of the timing belt 70 appropriately. Thus, when the motor 64 is driven, the rotational driving force is transmitted to the driven pulley 52 of each screw trough unit 40 via the timing belt 70 to drive each screw conveyor 21. In this case, as shown in FIG. 7, the idler 54 is not disposed at an intermediate position between the driven pulleys 52 to press the timing belt 70, but the timing belt 70 is coupled with the idler 54 disposed directly above the driven pulley 52. Was inserted.

  FIG. 8A is a partial enlarged view of the case where the timing belt 70 is sandwiched between the idler 54 disposed just above the driven pulley 52 (hereinafter referred to as the present invention). On the other hand, FIG. 8B is a partially enlarged view when the idler 54 is disposed at an intermediate position between the driven pulleys 52 (referred to as proportional).

  (1) In the present invention, since the idler 54 is disposed right above the driven pulley 52 and the timing belt 70 is sandwiched, the vertical load applied to the idler 54 becomes zero. Thereby, the force F (moving force) that pulls the timing belt 70 can be efficiently converted into the rotational force of the driven pulley 52.

  In addition, it is possible to reliably prevent idling due to a tooth skipping phenomenon in which the timing belt 70 is disengaged from the teeth of the driven pulley 52, and it is possible to prevent vibration of the belt drive mechanism 44 transmitted to the screw conveyor 21 of each screw trough unit 40. Therefore, the rotational driving force of one motor 64 can be distributed to each driven pulley 52 accurately and evenly. Further, the tension of the timing belt 70 does not become excessively large and an excessive load is not applied to the motor 64.

  Furthermore, since the idler 54 can be disposed close to the driven pulley 52 by sandwiching the timing belt 70 between the driven pulley 52 and the idler 54, the screw trough 22 is unitized to form the screw trough unit 40 having the above structure. Is possible. As a result, it is possible to achieve the two problems of providing a positioning adjustment mechanism 48 for each screw trough 22 and driving a large number of screw conveyors 21 with a single motor 64 with high accuracy. As a result, it is possible not only to significantly suppress an increase in running cost as compared with the case where the motor 64 is provided for each screw conveyor 21, but also it is not necessary to secure a large space for the motor 64.

(2) In contrast, when the timing belt 70 is pulled with the force F, the vertical load applied to the idler 54 is 2Fsin θ. As a result, the idler 54 is pushed outward (upward), so that the sliding resistance of the rotating shaft when the idler 54 rotates increases, and the power for rotating the idler 54 shaft is lost. In the present invention, it is necessary to dispose a large number of idlers 54. Therefore, the sliding resistance of each idler 54 shaft is added, and the loss of rotational power becomes so large that it cannot be ignored. Further, when the timing belt 70 expands and contracts, tooth skipping easily occurs, and vibration of the belt driving mechanism 44 that transmits to the screw conveyor 21 of each screw trough unit 40 also easily occurs. Therefore, the rotational driving force of one motor 64 cannot be distributed accurately and evenly to each driven pulley 52.

  Furthermore, in the system in which the idler 54 is disposed at an intermediate position between the driven pulleys 52, the screw trough 22 cannot be unitized as the screw trough unit 40.

  Next, the operation of the magnetic separation device 10 configured as described above will be described.

  The raw water containing the magnetic floc F flows from the water supply port 36 formed at the lower end of the separation tank 12 and is divided by the flow dividing member 38. The diversion member 38 diverts the raw water to the left and right sides with respect to the surface of the continuously rotating magnetic disk 18 and also diverts the raw water into the ferromagnetic space between the magnetic disks 18. In the middle of the separated raw water rising in the separation tank 12, the magnetic floc F in the raw water is adsorbed on the surface of the magnetic disk 18. The treated water that has been adsorbed and purified by the magnetic floc F overflows into a pair of overflow tanks 26 provided on the left and right sides of the magnetic floc F.

  On the other hand, the magnetic floc F attracted to the magnetic disk 18 is transported to the atmosphere above the water surface by the continuous rotation of the magnetic disk 18 and exposed to the atmosphere. When the magnetic floc F is exposed to the atmosphere, the moisture of the magnetic floc F flows down into the separation tank 12 along the surface of the magnetic disk 18 due to gravity. Further, the magnetic floc F attracted to the magnetic disk 18 is consolidated by the magnetic force of the magnetic disk 18. As a result, dehydration of the magnetic floc F is promoted, and a sludge with a moisture content of about 90% is obtained.

  The magnetic floc F whose dehydration has been promoted is conveyed to the position of the screw trough 22 by the continuous rotation of the magnetic disk 18, scraped off by the scraper 20 formed integrally with the trough 19, and dropped into the trough 19. The magnetic flock F that has fallen into the trough 19 is transported to above the flock collection tank 28 by the screw conveyor 21, and then falls into the flock collection tank 28 through the flow pipe 56.

  In the magnetic separation of the magnetic floc F by the magnetic separation device 10, a screw trough unit 40 in which the screw troughs 22 are unitized one by one is formed so that the screw trough 22 can be detachably attached to the base plate 42, and a positioning adjustment mechanism 48. Thus, the attachment position to the base plate 42 can be adjusted in the lateral direction. Accordingly, the screw trough can be accurately positioned and installed at an intermediate position between the magnetic disks 18. Furthermore, even when one screw trough 22 breaks down, it can be easily removed from the apparatus main body 14.

  Further, a driven pulley 52 and an idler 54 for rotating the screw conveyor 21 are provided on the mounting plate 50 of the screw trough unit 40, and a timing belt 70 suspended between a drive pulley 66 and a support pulley 68 of a motor 64. Therefore, even if the tension of the timing belt 70 is loosened by the positioning adjustment, the timing belt 70 does not slip. This makes it possible to achieve both positioning adjustment and a belt drive system. Therefore, the present invention can accurately drive a large number of screw conveyors 21 with a single motor while having a positioning adjustment function for each screw trough 22.

The perspective view of the magnetic separation apparatus of this invention Side sectional view of the magnetic separation device of the present invention Front sectional view of the magnetic separation device of the present invention The perspective view which shows the whole structure of the magnetic flock discharge | emission means which is the principal part of this invention The perspective view explaining the relationship between the screw trough unit and the base plate and the positioning adjustment mechanism Explanatory drawing explaining a scraper The perspective view which shows the state by which the idler was provided between the driven pulleys of the screw trough unit Partial enlarged view of the belt drive mechanism in comparison with the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Magnetic separation apparatus, 12 ... Separation tank, 14 ... Apparatus main body, 16 ... Rotary axis of a magnetic disk, 18 ... Magnetic disk, 19 ... Trough, 20 ... Scraper, 21 ... Screw conveyor, 22 ... Screw trough, 24 ... Magnetic Floc discharging means, 26 ... overflow tank, 28 ... flock recovery tank, 30 ... bearing, 32 ... magnetic disk motor, 34 ... sleeve, 36 ... water supply port, 38 ... diversion member, 40 ... screw trough unit, 42 ... base Plates 44... Belt drive mechanism 46. Mounting opening 48. Positioning adjustment mechanism 50. Mounting plate 52. Followed pulley 54 54 Idler 56 Flowing pipe 58 58 Long hole 60 Fixing hole 62 ... bolt, 64 ... motor, 66 ... motor drive pulley, 68 ... support pulley, 70 ... timing belt, 72 ... belt tensioner, F Magnetic flocks

Claims (3)

A plurality of apparatus main bodies including a separation tank into which raw water containing magnetic floc flows in and a rotation shaft disposed in the separation tank with a predetermined interval therebetween to adsorb the magnetic flocs by magnetic force By disposing a screw trough having a screw conveyor in a bowl-shaped trough between the magnetic disks, scraping means for scraping off the magnetic flocs adsorbed on the magnetic disk, and a magnetic trough between the magnetic disks, Magnetic floc discharging means for forcibly discharging the scraped magnetic floc out of the separation tank,
The magnetic flock discharging means is
A base plate that is supported by the apparatus main body and provided in the vertical direction and in which the screw trough mounting openings are formed in the horizontal direction;
The screw trough is detachably attached to each attachment opening of the base plate, and a mounting plate provided with a positioning adjustment mechanism capable of adjusting the attachment position in the lateral direction, and rotation of the screw conveyor passing through the mounting plate A screw trough unit integrally formed as a unit with a driven pulley provided at a shaft end, and an idler rotatably supported by the mounting plate and disposed near the pulley;
A state in which an endless timing belt suspended between a drive pulley and a support pulley of one motor is sandwiched between a driven pulley and an idler of each screw trough unit attached to the attachment opening of the base plate And a belt driving mechanism for transmitting the driving force of the motor to the screw conveyor of each screw trough unit.   The positioning adjustment mechanism comprises a plurality of laterally elongated holes formed in the mounting plate, and a fixing jig for attaching and fixing the mounting plate to the base plate through the elongated holes. The magnetic separation device according to claim 1.   3. The magnetic separation device according to claim 1, wherein the number of the magnetic disks is in the range of 5 to 50.

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