Solids scraper and method for replacing its drive mechanism

Abstract

To provide a solid content scraper in which replacement or repair of a rotary drive mechanism such as a driving device and a power transmission mechanism can be easily performed, and a drive mechanism replacement method for the same.SOLUTION: A solid content scraper 1-1, in which a driving device 50 and so on are installed above a water surface near a center of a sedimentation pond 10, scrapes solid contents in the sedimentation pond 10 by turning a turning arm 80 to which a scraper 81 is attached by a main spindle 70 connected to the driving device 50. At a position of the main spindle 70 above a water surface of the sedimentation pond 10, a connection part, which detachably connects the main spindle 70 and the driving device 50 to each other, is provided. Holding means, which holds the main spindle 70 removed from the driving device 50 in the vicinity of a removed position, is installed at a position above the water surface of the sedimentation pond 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solids scraper used to scrape and separate solids from a liquid, and a method for replacing a drive mechanism thereof. [Background technology]

[0002] The separation of solids from liquids is an important operation not only in the treatment of sewage, night soil, industrial wastewater, and drinking water, but also in factory production processes, and solid scrapers are used for this purpose.

[0003] This type of solid scraper has a configuration in which a swivel arm (scraper arm) is installed in a settling tank (water tank), and a scraper (scraper blade, scraping part) is attached to this swivel arm to scrape up the sediment (solids) that has settled to the bottom of the settling tank, and the sediment scraped up by the scraper and the water from which the sediment has been removed are each discharged outside the system.

[0004] Among the solid scrapers, there are a centrally driven suspended type solid scraper, a centrally driven column type solid scraper, and a peripherally driven column type solid scraper. The centrally driven suspended type solid scraper is configured by installing a drive unit (motor) near the center of the settling tank, and installing a swivel arm and a scraper on a main shaft suspended from the drive unit. The centrally driven column type solid scraper is configured by installing a swivel arm and a scraper on a center cage that is driven to rotate by a drive unit attached to the top of a column erected near the center of the settling tank. The peripherally driven column type solid scraper is configured to rotate a rotating body such as a walkway rotatably supported on a column erected near the center of the settling tank by a drive unit installed near the outer periphery of the settling tank, and at the same time rotate the center cage attached to the rotating body and the swivel arm and scraper attached to the center cage. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-31806 Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-mentioned conventional scrapers, when replacing or repairing the drive unit or its power transmission mechanism, it was necessary to drain and clean the settling tank, temporarily support the main shaft, center cage, and rotating arm that hang from the drive unit and its power transmission mechanism in the settling tank in their current positions so that they do not fall, and then replace the drive unit or power transmission mechanism, etc. Therefore, there was a problem that these operations were cumbersome.

[0007] Furthermore, in treatment facilities that do not have a spare solids collector, if there is an emergency breakdown in the drive unit or power transmission mechanism, it is necessary to start by draining the water from the settling tank, which poses the issue of not being able to quickly replace or repair the unit.

[0008] The present invention has been made in consideration of the above-mentioned points, and its object is to provide a solid scraper and a method for replacing its drive mechanism that enable easy replacement or repair of rotary drive mechanisms such as drive units and power transmission mechanisms. [Means for solving the problem]

[0009] The present invention provides a water tank having a rotary drive mechanism, which is at least a drive unit or a power transmission mechanism thereof, installed above the water surface near the center of the water tank, and a scraper is attached to the rotary drive mechanism. main shaft In the solid content scraper, the solid content scraper is disposed in the water tank and scrapes solid content in the water tank by the scraper that is driven to rotate. main shaft The water tank is provided with a water level sensor. main shaft and a connecting portion for detachably connecting the rotary drive mechanism to the rotary drive mechanism, main shaft The part removed Place Holding means for holding The holding means is configured such that the support member on the spindle side is supported by a bracket extending radially outward from the spindle so that the support member on the walkway side installed on the top of the water tank holds the support member on the spindle side at a position above the water surface of the water tank, the support member on the walkway side is configured by a steel material constituting the walkway or a bracket attached to the steel material, and the bracket on the spindle side is temporarily fixed or placed on the steel material or bracket on the walkway side to hold the spindle. It is characterized by the following. According to the present invention, the holding means is installed at a position above the water surface of the water tank. main shaft This allows the rotation drive mechanism to be easily replaced or repaired without the need for complicated and time-consuming work such as draining the water from the tank. In addition, a method for rapid maintenance can be ensured in the event of emergency damage to the drive device that constitutes the rotary drive mechanism or in treatment facilities that do not have spare machines, ensuring safety and security in water treatment and contributing to a longer lifespan of the equipment.

[0010] In addition to the above-mentioned features, the present invention further provides a solid content collector, wherein the rotary drive mechanism has the drive device, main shaft is suspended from the drive unit During Centrally driven suspended solids collector By machine It is characterized by the fact that

[0011] In addition to the above features, the present invention also provides: The holding means is characterized in that a bracket which is a support member on the spindle side is placed on top of a bracket which is a support member on the walkway side, and a space for installing a jack mechanism is provided between the bracket which is a support member on the walkway side and the bracket which is a support member on the spindle side.

[0012] The present invention also provides A solid scraper includes a rotary drive mechanism, which is composed of at least a drive unit or a power transmission mechanism thereof, disposed above the water surface near the center of a water tank, a main shaft, which is rotated by the rotary drive mechanism and has a scraper attached thereto, disposed in the water tank, and scrapes solids in the water tank with the rotary drive scraper. The solid scraper is a centrally driven suspended solid scraper in which the rotary drive mechanism has the drive unit and the main shaft is suspended from the drive unit, and a connection part is provided at a position of the main shaft above the water surface of the water tank to detachably connect the main shaft and the drive unit, the connection portion is configured to connect a flange provided on a drive shaft of the drive device and a flange provided on the main shaft, The drive unit has a holding means for holding the main shaft at the removed position when the drive unit is removed from the connection portion, and the holding means is configured to hold the support member on the walkway side installed on the top of the water tank at a position above the water surface of the water tank, The spindle-side support member of The flange is provided on the main shaft, and the flange has an enlarged outer diameter. death , The support member on the walkway side is formed of a steel material constituting the walkway or a bracket attached to the steel material, The flange enlarged portion is temporarily fixed or placed on the steel material constituting the walkway or on a bracket attached to the steel material to hold the main shaft. Let It is characterized by the fact that According to the present invention, the flange expansion portion provided on the flange on the spindle side is held by the steel material on the walkway side or the bracket on the walkway side, so that the structure for holding the spindle is simple and the space required for holding it can be reduced.

[0013] In addition to the above features, the present invention further provides a support member on the walkway side. A bracket On top of that, the support member on the spindle side The flange enlargement and a support member on the corridor side. A bracket and spindle side support member The flange enlargement This configuration is characterized by having a space for installing a jack mechanism between the two. According to the present invention, since space for installing a jack mechanism is provided, the jack mechanism can be easily installed, thereby making it possible to easily adjust the holding position of the main shaft in the vertical direction, and making it easier and smoother to attach and detach the rotation drive mechanism.

[0014] The present invention also provides A solids scraper includes a rotary drive mechanism, which is at least a drive unit or a power transmission mechanism thereof, disposed above the water surface near the center of a water tank, and a rotary member, which is rotated by the rotary drive mechanism and has a scraper attached thereto, disposed in the water tank, and scrapes up solids in the water tank using the rotary drive scraper. The rotary member is provided with a connection part at a position above the water surface of the water tank for detachably connecting the rotary member to the rotary drive mechanism, and the rotary member is provided with a holding means at the connection part for holding the rotary member, which is removed from the rotary drive mechanism, in the removed position; The solid content collector has a rotary drive mechanism installed on the upper part of a support protruding from the bottom side near the center of the water tank, and the rotary member is rotated by the rotary drive mechanism. As The solids collector is a centrally driven column type solids collector or a peripherally driven column type solids collector having a center cage installed so as to surround the outer periphery of the column, and the holding means is a support member on the column side that holds the support member on the center cage side at a position above the water surface of the water tank. In this way, the support member on the support pillar side is formed of a bracket that projects radially outward from the support pillar, and the center cage is held by temporarily fixing or placing the support member on the support pillar side on the bracket. It is characterized by the following. According to the present invention, the support member on the support pillar side is configured to hold the support member on the center cage side, so that in a centrally driven pillar type solid content collector or a peripherally driven pillar type solid content collector, the center cage and the like can be held at a position above the water surface of the tank with a simple configuration.

[0015] In addition to the above features, the present invention further provides a method for manufacturing a support structure, comprising: bracket The support member on the center cage side is disposed on the support member on the column side. bracket This configuration is characterized by having a space for installing a jack mechanism between the support member on the center cage side and the support member on the center cage side. According to the present invention, since space for installing a jack mechanism is provided, the jack mechanism can be easily installed, thereby making it possible to easily adjust the holding position of the center cage in the vertical direction, and making it easier and smoother to attach and detach the rotation drive mechanism.

[0016] In addition to the above features, the present invention further comprises a support member on the side of the walkway installed on the water tank, which is provided on the support member on the side of the center cage. Brackets installed on the walkway as The device further comprises a second holding means for holding the water tank at a position above the water surface. According to the present invention, for example, in the case where the walkway is supported on the rotary drive mechanism, even if the rotary drive mechanism is removed, the walkway can be maintained in the correct position, thereby enabling the rotary drive mechanism to be attached and detached smoothly.

[0017] In addition to the above-mentioned features, the present invention further comprises a support member on the center cage side, and a support member on the walkway side. bracket and the support member on the center cage side and the support member on the walkway side are arranged. bracket The present invention is characterized in that a space for installing a second jack mechanism is provided between the first and second jack mechanisms. According to the present invention, since space is provided for installing the second jack mechanism, the second jack mechanism can be easily installed between the support member on the center cage side and the support member on the walkway side, thereby making it easy to adjust the holding position of the walkway in the vertical direction and making it easier and smoother to attach and detach the rotation drive mechanism.

[0018] The present invention also provides a method for replacing the drive mechanism of a solid content scraper in which a rotary drive mechanism consisting of at least a drive unit or its power transmission mechanism is installed above the water surface near the center of a water tank, a rotating member that is rotated by the rotary drive mechanism and has a scraper attached is placed in the water tank, and the solid content in the water tank is scraped up by the rotary drive scraper, the method comprising the steps of: holding the rotating member at a position above the water surface of the water tank; a removal step of removing the rotary drive mechanism from the rotating member held in the holding step at a position above the water surface of the water tank; an attachment step of attaching the repaired or replaced rotary drive mechanism to the rotating member from which the rotary drive mechanism was removed in the removal step at a position above the water surface of the water tank; and a release step of releasing the holding of the rotating member that was held at a position above the water surface of the water tank in the holding step. According to the present invention, the rotating member can be held at a position above the water surface of the tank, making it possible to easily replace or repair the rotation drive mechanism without having to perform complicated and time-consuming tasks such as draining the water from the tank.

[0019] In addition to the above-mentioned characteristics, the present invention may also be configured such that the solid content scraper is a centrally driven suspended solid content scraper in which the rotary drive mechanism has the drive unit and the rotating member has a main shaft suspended from the drive unit, and the holding process is a process in which a support member on the walkway side installed on the top of the water tank holds the support member on the main shaft side at a position above the water surface of the water tank.

[0020] In addition to the above-mentioned features, the present invention may also be configured such that the solid content scraper has the rotary drive mechanism installed on the top of a support pillar protruding from the bottom side near the center of the tank, and the rotating member rotated by the rotary drive mechanism is a centrally driven support pillar type solid content scraper or a peripherally driven support pillar type solid content scraper having a center cage installed to surround the outer periphery of the support pillar, and the holding process is a process of causing the support member on the support pillar side to hold the support member on the center cage side at a position above the water surface of the tank. Effect of the Invention

[0021] According to the present invention, the rotation drive mechanism, such as the drive unit or the power transmission mechanism, can be easily replaced or repaired. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 shows an example of a centrally driven suspended solids scraper 1-1 installed in a settling basin 10, where FIG. 1(a) is a schematic plan view and FIG. 1(b) is a schematic side cross-sectional view. [Diagram 2] FIG. 2(a) is an enlarged schematic cross-sectional view of a main portion of a connection portion between the drive unit 50 and the main shaft 70, and FIG. 2(b) is a view taken along the line AA in FIG. 2(a). [Diagram 3] FIG. 3(a) is an enlarged schematic cross-sectional view of a main portion of a connection portion between the drive unit 50 and the main shaft 70, and FIG. 3(b) is a view taken along the line BB in FIG. 3(a). [Figure 4] FIG. 4(a) is an enlarged schematic cross-sectional view of a main portion of a connection portion between the driving device 50 and the main shaft 70, and FIG. 4(b) is a view taken along the line CC in FIG. 4(a). [Diagram 5] FIG. 5(a) is an enlarged schematic cross-sectional view of a main portion of a connection portion between the driving device 50 and the main shaft 70, and FIG. 5(b) is a view taken along the line DD in FIG. 5(a). [Figure 6] 2 is an enlarged schematic cross-sectional view of a main portion of a connection portion between a drive unit 50 and a main shaft 70. FIG. [Figure 7] 2 is an enlarged schematic cross-sectional view of a main portion of a connection portion between a drive unit 50 and a main shaft 70. FIG. [Figure 8] 2 is an enlarged schematic cross-sectional view of a main portion of a connection portion between a drive unit 50 and a main shaft 70. FIG. [Figure 9] 9(a) is an enlarged schematic cross-sectional view of a main portion of a connection portion between the drive unit 50 and the main shaft 70, and FIG. 9(b) is a view taken along the line EE in FIG. 9(a). [Figure 10] FIG. 2 is a schematic cross-sectional side view showing an example of a centrally driven column type solids collector 1-2 installed in a sedimentation tank 10. [Figure 11] 1 is an enlarged schematic cross-sectional view of essential parts of a drive unit 150, a power transmission mechanism 160, the vicinity of the upper part of a support column 110, and the vicinity of the upper part of a center cage 190. FIG. [Figure 12] 11 is a diagram showing the positional relationship among the support pillar 110, the center cage 190, and the walkway 180 when FIG. 11 is viewed from below. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Figure 1 shows an example of a centrally driven suspended solids collector (hereinafter referred to as "solids collector") 1-1 installed in a sedimentation tank 10, where Figure 1(a) is a schematic plan view and Figure 1(b) is a schematic side cross-sectional view.

[0024] As shown in these figures, the solid scraper 1-1 is composed of a walkway 30 installed across the top of a settling basin 10 consisting of a circular water tank, a drive unit 50 installed in the center of the walkway 30, a main shaft 70 suspended from the drive unit 50, and a swivel arm (scraper arm) 80 attached to the bottom of the main shaft 70.

[0025] The walkway 30 is installed on the upper edge of the outer periphery of the sedimentation tank 10 so as to straddle the central part of the sedimentation tank 10. The walkway 30 is constructed by installing a flat floor plate on a pair of parallel walkway foundation members 31, 31 (see FIG. 2 below), and attaching handrails 34 to both sides of the floor plate. A drive unit 50 is installed at the center of the walkway 30, and a plurality of inspection hatches 32 (four in this example) are formed in the walkway 30 part around the drive unit 50. On the underside of the inspection hatch 32, an inspection stand 33 is installed for performing maintenance of coupling parts (connecting parts) 59, 61 that connect the output shaft (drive shaft) 55, 57 of the drive unit 50 to the main shaft 70, and the holding means (brackets 71, 71 and the walkway 30) described below. The inspection stand 33 is installed at a position higher than the maximum water level HWL of the sedimentation tank 10.

[0026] A rotating arm 80 that rotates integrally with the main shaft 70 is attached to the lower part of the main shaft 70. A scraper (scraper blade) 81 that scrapes off sludge that has settled on the bottom of the settling basin 10 is attached to the rotating arm 80.

[0027] Fig. 2(a) is an enlarged schematic cross-sectional view of the main part of the connection between the driving device 50 and the main shaft 70, and Fig. 2(b) is a view taken along the line AA in Fig. 2(a). As shown in Fig. 2(a), the driving device 50 is equipped with a motor-direct-coupled reducer 53 installed on a driving device stand 51, and a drive shaft 57 connected to a drive shaft 55 of the motor-direct-coupled reducer 53. The main shaft 70 is connected to the drive shaft 57. Here, the driving device 50 equipped with the motor-direct-coupled reducer 53 and the drive shaft 57 constitutes a rotation drive mechanism.

[0028] The lower end of drive shaft 55 of motor direct-coupled reducer 53 is connected to the upper end of drive shaft 57 by upper coupling 59, and the lower end of drive shaft 57 is connected to the upper end of main shaft 70 by lower coupling 61. Upper coupling 59 is constructed by joining and fixing flange 551 provided on drive shaft 55 to flange 571 provided on drive shaft 57, and lower coupling 61 is constructed by joining and fixing flange 573 provided on drive shaft 57 to flange 701 provided on main shaft 70. The joint portion of flange 573 and flange 701 is referred to as a connection portion that detachably connects main shaft 70 and drive unit 50.

[0029] The middle part of the drive shaft 57 is supported by a bearing portion 63. The bearing portion 63 is fixed to the upper surface side of the walkway foundation members 31, 31 made of H-shaped steel that constitute the walkway 30. The drive unit base 51 on which the drive unit 50 is installed is attached to the upper part of the walkway foundation members 31, 31.

[0030] As shown in Figures 2(a) and 2(b), one end of each of a pair of brackets 71, 71 is fixed to the outer peripheral surface of the lower side of the lower coupling 61 of the main shaft 70. Both brackets 71, 71 are attached so as to protrude linearly from positions 180° opposite each other on the outer peripheral surface of the main shaft 70 in the radially outward direction and at the same height. These brackets 71, 71 rotate (pivot) with the rotation of the main shaft 70, and are positioned so that the upper surfaces of both brackets 71, 71 approach but do not come into contact with the lower surfaces of the walkway foundation members 31, 31.

[0031] Then, for example, water is taken from a river and after garbage and sand have been settled in a grit basin, it is introduced into the settling tank 10 shown in Fig. 1. A coagulant is added to the introduced water to generate coagulated flocs, which are then settled to the bottom of the settling tank 10. At this time, by driving the motor-direct-coupled reducer 53, the main shaft 70 and the rotary arm 80 are rotated via the drive shaft 57, and the sediment is collected in the center of the bottom of the settling tank 10 and discharged to the outside through a pipe (not shown) and transferred to the next process. Meanwhile, the water from which the sediment has been removed is discharged to the outside through another pipe or the like and transferred to the next process.

[0032] Next, when replacing or repairing the drive unit 50, such as the motor-direct type reducer 53, the drive shaft 57, or the bearing part 63, a worker first enters the inspection platform 33 through the inspection hatch 32 of the walkway 30, and rotates the main shaft 70 to move the position of both brackets 71, 71 to the position shown in Figure 2 (b), i.e., the position where the longitudinal direction of both brackets 71, 71 intersects with the longitudinal direction of the walkway foundation members 31, 31.

[0033] Next, the positions of the mounting holes (not shown) previously formed in the brackets 71 and the corridor foundation members 31 are aligned, and the brackets 71 and the corridor foundation members 31 are fixed by fixing means R1 such as bolts and nuts. As a result, the main shaft 70 and the revolving arm 80 are fixed to the corridor 30, which is the fixed member.

[0034] Next, the connection portion between the flange 573 and the flange 701 constituting the lower coupling 61 is separated, so that the load of the main shaft 70 and the revolving arm 80 is supported on the walkway 30 via the brackets 71, 71. The above process is a holding process for holding the main shaft 70 at a position above the water surface of the settling basin 10.

[0035] Next, in this state, for example, the drive unit 50 is replaced or repaired (removal process). At this time, since the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30, the motor direct-coupled reducer 53 of the drive unit 50 and the like can be easily and smoothly removed.

[0036] In this way, both brackets 71, 71 and the walkway 30 to which they are attached constitute a holding means for holding the main shaft 70 removed from the drive unit 50 in the vicinity of the position where it was removed.

[0037] After replacement or repair of the drive unit 50 is completed, the connecting portions of the flanges 573 and 701 are connected (attachment process), and then the fixed state between the brackets 71, 71 and the walkway foundation members 31, 31 is released (retention release process).

[0038] This completes the replacement or repair work. Note that the replacement or repair procedure described above is only one example, and replacement or repair may be performed using various other different replacement or repair procedures (the same applies to the following embodiments).

[0039] Since the main shaft 70 and other components are held above the water surface, there is no need to drain the water from the sedimentation tank 10 or temporarily support the main shaft 70 and the swivel arm 80 inside the drained sedimentation tank 10 as in the past, and therefore replacement or repair work for the drive unit 50 can be performed easily and smoothly in a short time. Also, a quick maintenance method can be ensured in the event of emergency damage to the drive unit 50 or in a treatment facility without a spare unit, ensuring safety and security in water treatment and contributing to a longer life for the equipment.

[0040] Fig. 3(a) is an enlarged schematic cross-sectional view of a main portion of a connection portion between a drive unit 50 and a main shaft 70 according to another embodiment of the present invention, and Fig. 3(b) is a view taken along the arrow BB in Fig. 3(a). In this embodiment, the same or corresponding parts as those in the embodiment shown in Figs. 1 and 2 are denoted by the same reference numerals. Note that matters other than those described below are the same as those in the embodiment shown in Figs. 1 and 2.

[0041] In this embodiment, the configuration of the retaining means which differs from the embodiment shown in Figures 1 and 2 is that a pair of corridor side brackets 35, 35 are spanned in parallel between the two corridor foundation members 31, 31, and brackets 71, 71 of the main shaft 70 are positioned close to the upper surfaces of these corridor side brackets 35, 35 so that the surfaces of the two do not come into contact.

[0042] The brackets 35, 35 on the corridor side are roughly U-shaped, and both ends are fixed to the outer sides of the corridor foundation members 31, 31 by mounting fittings 35a, 35a, and are installed on the underside of the corridor foundation members 31, 31.

[0043] When replacing or repairing the drive unit 50, such as the motor-direct-drive reducer 53, drive shaft 57, or bearing portion 63, as described above, a worker enters the inspection platform 33 through the inspection hatch 32 in the walkway 30 and rotates the main shaft 70 to move the positions of both brackets 71, 71 to the position shown in Figure 3(b), i.e., the position where the longitudinal direction of both brackets 71, 71 intersects with the longitudinal direction of both brackets 35, 35.

[0044] Next, the positions of the mounting holes (not shown) previously formed in both brackets 71, 71 and both brackets 35, 35 are aligned, and the brackets 71, 71 are fixed to the brackets 35, 35 by fixing means R1, R1 such as bolts and nuts. In this embodiment, it is also possible to simply place both brackets 71, 71 on both brackets 35, 35 without using the fixing means R1, R1. In this way, the main shaft 70 and the swivel arm 80 are attached to the brackets 35, 35 on the walkway 30 side, which are the fixed members.

[0045] Next, the connection portion between the flange 573 and the flange 701 constituting the lower coupling 61 is separated, so that the load of the main shaft 70 and the rotating arm 80 is supported on the walkway 30 via the brackets 71, 71 and brackets 35, 35.

[0046] In this state, for example, the drive unit 50 is replaced or repaired. At this time, the load of the main shaft 70 and the swivel arm 80 is supported by the walkway 30, so that the motor-direct-connected reducer 53 of the drive unit 50 and the like can be removed easily and smoothly.

[0047] In this embodiment, the two brackets 71, 71 constituting the support member on the main shaft 70 side and the two brackets 35, 35 constituting the support member on the walkway 30 side to which they are fixed (or only placed) constitute a holding means for holding the main shaft 70 removed from the drive unit 50 in the vicinity of the removed position.

[0048] When replacement or repair of the drive unit 50 is completed, the connecting portions of the flanges 573 and 701 are connected, and the fixed state between the brackets 71, 71 and the brackets 35, 35 (the placed state when not fixed) is released. This completes the replacement or repair work.

[0049] In this embodiment, the main shaft 70 and other components are held above the water surface, so there is no need to drain the water from the settling tank 10 as in the conventional case, and the work can be carried out easily and smoothly in a short time.

[0050] Fig. 4(a) is an enlarged schematic cross-sectional view of a main part of a connection portion between a drive unit 50 and a main shaft 70 according to still another embodiment of the present invention, and Fig. 4(b) is a view taken along the CC arrow in Fig. 4(a). In this embodiment, the same or corresponding parts as those in the embodiment shown in Figs. 1 and 2 are denoted by the same reference numerals. Note that matters other than those described below are the same as those in the embodiment shown in Figs. 1 and 2.

[0051] In this embodiment, the configuration of the retaining means which differs from the embodiment shown in Figures 1 and 2 is that the outer diameter of the flange 701 of the main shaft 70 is enlarged to form an expanded flange portion 701A, and this expanded flange portion 701A is used as a support member on the main shaft 70 side, and that a pair of walkway side brackets 37, 37 fixed in parallel between the two walkway foundation members 31, 31 and jack bolts (jack mechanism) 39, 39 attached to these brackets 37, 37 are used as support members on the drive unit 50 side.

[0052] The brackets 37, 37 on the corridor side are formed to a length that spans between the two corridor foundation members 31, 31, and are directly fixed to the undersides of the corridor foundation members 31, 31 by fixing means R1, R1 such as bolts and nuts. A space S1 for installing a jack mechanism is formed between the brackets 37, 37 on the corridor side and the flange enlarged diameter portion 701A on the spindle side.

[0053] When replacing or repairing the drive unit 50, as described above, a worker enters the inspection platform 33 through the inspection hatch 32 of the walkway 30. In this embodiment, it is not necessary to rotate the main shaft 70 to adjust its rotational position.

[0054] Next, the jack bolts 39, 39 are rotated so that their upper ends come into contact with the flange enlarged diameter portions 701A, respectively, whereby the main shaft 70 and the revolving arm 80 are supported by both brackets 37, 37 on the walkway 30 side, which are fixed members.

[0055] Next, the connection portion between the flange 573 and the flange 701 constituting the lower coupling 61 is separated, so that the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30.

[0056] In this state, for example, the drive unit 50 is replaced or repaired in the same manner as described above. At this time, since the load of the main shaft 70 and the swivel arm 80 is supported by the walkway 30, the motor-direct-connected reducer 53 of the drive unit 50 and the like can be easily and smoothly removed.

[0057] In this embodiment, the flange expansion portion 701A and the brackets 37, 37 on the walkway 30 side on which it is placed and the jack bolts 39, 39 form a holding means for holding the main shaft 70 removed from the drive unit 50 in the vicinity of the removed position.

[0058] When replacement or repair of the drive unit 50 is completed, the connecting portions of the flanges 573 and 701 are connected, and then the jack bolts 39, 39 are rotated in the reverse direction to pull their upper ends away from the flange enlarged diameter portion 701A, and the holding state of the main shaft 70, etc. is released. This completes the replacement or repair work.

[0059] In this embodiment, the main shaft 70 and other components can be held above the water surface, so there is no need to drain the water from the settling tank 10 as in the conventional case, and the work can be carried out easily and smoothly in a short time.

[0060] The jack bolts 39, 39 may be removed from the brackets 37, 37 during normal operation.

[0061] Fig. 5(a) is an enlarged schematic cross-sectional view of a main part of a connection portion between a drive unit 50 and a main shaft 70 according to still another embodiment of the present invention, and Fig. 5(b) is a view taken along the line DD in Fig. 5(a). In this embodiment, the same or corresponding parts as those in the embodiment shown in Figs. 1 and 2 are denoted by the same reference numerals. Note that matters other than those described below are the same as those in the embodiment shown in Figs. 1 and 2.

[0062] In this embodiment, the configuration of the retaining means which differs from the embodiment shown in Figures 1 and 2 is that four brackets 73, 73, ... are protruding radially outward at equal intervals from the outer peripheral surface of the main shaft 70, and these four brackets 73, 73, ... are used as support members on the main shaft 70 side, and in that a square ring-shaped bracket 41 attached to the lower ends of four pillars 311, 311, ... which are attached facing downward to the undersides of both corridor foundation members 31, 31, and jacks (jack mechanism) 43, 43, ... installed on these brackets 41 are used as support members on the drive unit 50 side.

[0063] The brackets 73, 73, ... on the main shaft 70 side are flat plate-shaped and are installed at positions with a predetermined gap between them and the lower surfaces of the walkway foundation members 31, 31.

[0064] The bracket 41 on the walkway 30 side is formed in a rectangular ring shape and is located below the bracket 73 on the main shaft 70 side, and a space S2 for installing a jack mechanism is formed between the two, spaced a predetermined distance apart.

[0065] When replacing or repairing the drive unit 50, as described above, a worker enters the inspection platform 33 through the inspection hatch 32 in the walkway 30 and rotates the main shaft 70 to move the position of the brackets 73, 73, ... to the position shown in Figure 5 (b), i.e., so that the portions near the tips of both brackets 73, 73, ... are positioned in the center of each side of the bracket 41.

[0066] Next, the shafts in the jacks 43, 43, ... are raised so that their upper ends come into contact with the lower surfaces of the brackets 73, 73, .... As a result, the main shaft 70 and the revolving arm 80 are supported by the bracket 41 on the walkway 30 side, which is the fixed member.

[0067] Next, the connection portion between the flange 573 and the flange 701 constituting the lower coupling 61 is separated, so that the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30.

[0068] In this state, for example, the drive unit 50 is replaced or repaired in the same manner as described above. At this time, since the load of the main shaft 70 and the swivel arm 80 is supported by the walkway 30, the motor-direct-connected reducer 53 of the drive unit 50 and the like can be easily and smoothly removed.

[0069] In this embodiment, the brackets 73, 73, ... and the bracket 41 on the walkway 30 side on which they are placed and the jacks 43, 43, ... constitute a holding means for holding the main shaft 70 removed from the drive unit 50 in the vicinity of the position where it was removed.

[0070] When replacement or repair of the drive unit 50 is completed, the connecting portions of the flanges 573 and 701 are connected, and then the shafts in the jacks 43, 43, ... are lowered to separate their upper ends from the bracket 73, and the holding state of the main shaft 70, etc. is released. This completes the replacement or repair work.

[0071] In this embodiment, the main shaft 70 and other components can be held above the water surface, so there is no need to drain the water from the settling tank 10 as in the conventional case, and the work can be carried out easily and smoothly in a short time.

[0072] The jacks 43, 43, ... may be removed from the bracket 41 during normal operation (the same applies to the jacks 45, 47, 250, 260 described below). Also, instead of the four jacks 43, two jacks may be provided at positions 180° apart from each other.

[0073] Fig. 6 is an enlarged schematic cross-sectional view of the main part of the connection between the drive unit 50 and the main shaft 70 according to still another embodiment of the present invention. In this embodiment, the same or corresponding parts as those in the embodiment shown in Figs. 1 and 2 are given the same reference numerals. Note that matters other than those described below are the same as those in the embodiment shown in Figs. 1 and 2. In this embodiment and the embodiment shown in Figs. 7 to 9 described below, unlike the embodiment shown in Figs. 1 to 5, the holding member is installed on the upper side of the walkway 30.

[0074] That is, in the embodiment shown in Fig. 6, the second frame 52 is installed between the walkway foundation members 31, 31 and the drive unit frame 51 described in Fig. 1 and Fig. 2, so that the position of the lower coupling 61 on the main shaft 70 side is set above the walkway foundation members 31, 31, and a circular bracket 75 is installed at a position slightly above the upper surface of the walkway foundation members 31, 31 below the flange 701 of the main shaft 70. The outer diameter dimension of the bracket 75 is formed to be larger than the gap between the pair of walkway foundation members 31, 31. That is, the bracket 75 rotates with the main shaft 70, but is arranged so that the lower surface of the bracket 75 approaches the upper surface of the walkway foundation members 31, 31 and does not come into contact with it.

[0075] In addition, when replacing or repairing the drive unit 50, in this embodiment, the lower coupling 61 and bracket 75 are located above the walkway foundation members 31, 31, so that workers do not need to enter the inspection platform 33 of the walkway 30, improving workability (of course, they may enter the inspection platform 33 to perform work). In this embodiment, there is no need to rotate the main shaft 70 to adjust its rotational position, but instead, the rotational positions of the walkway foundation members 31, 31 and the bracket 75 may be adjusted so that the positions of the mounting holes provided on both are aligned, and then the two may be fixed together with fixing means such as bolts and nuts.

[0076] Next, the connection portion between the flange 573 and the flange 701 constituting the lower coupling 61 is separated, so that the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30.

[0077] In this state, for example, replacement or repair of the drive unit 50 is performed. At this time, since the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30, the motor direct-coupled reducer 53 of the drive unit 50 and the like can be easily and smoothly removed.

[0078] In this manner, the bracket 75 and the walkway 30 on which it is placed are a holding means for holding the main shaft 70 removed from the drive unit 50 in the vicinity of the position where it was removed.

[0079] When replacement or repair of the drive unit 50 is completed, the connecting parts of the flanges 573 and 701 are connected, and the bracket 75 is lifted slightly from the corridor foundation members 31, 31 to release it from its resting state. Specifically, the flange bolts that secure the flanges 573 and 701 are made longer, and the bracket 75 is released from its resting state on the corridor foundation members 31, 31 by tightening the flange bolts. Conversely, the bracket 75 is rested and held on the corridor foundation members 31, 31 by loosening the flange bolts as described above. This completes the replacement or repair work.

[0080] In this embodiment, the main shaft 70 and other components can be held above the water surface, so there is no need to drain the water from the settling tank 10 as in the conventional case, and the work can be carried out easily and smoothly in a short time.

[0081] In addition, the bracket 75 may be a bracket configured such that, in addition to being a circular steel material, two straight steel materials are attached to the outer circumferential surface of the main shaft 70, which are opposed at 180° to each other, so as to protrude radially outward from the outer circumferential surface.

[0082] 7 is an enlarged schematic cross-sectional view of the main part of the connection between the drive unit 50 and the main shaft 70 according to still another embodiment of the present invention. In this figure, the motor-direct-coupled reducer 53 is omitted. In this embodiment, the same or corresponding parts as those in the embodiment shown in Figs. 1, 2 and 6 are denoted by the same reference numerals. Note that matters other than those described below are the same as those in the embodiment shown in Figs. 1, 2 and 6.

[0083] In this embodiment, a circular bracket 77 is installed at a position below the flange 701 of the main shaft 70 and above the upper surfaces of the corridor foundation members 31, 31. The outer diameter dimension of the bracket 77 is formed to be larger than the gap between the pair of corridor foundation members 31, 31. In addition, a pair of jacks (jack mechanism) 45, 45 are installed on the upper surfaces of the corridor foundation members 31, 31 at positions facing the lower surfaces of the bracket 77.

[0084] The bracket 77 is installed at a position with a specified gap from the upper surfaces of the walkway foundation members 31, 31, and between them is a space S3 for installing a jack mechanism, spaced a specified distance apart.

[0085] When replacing or repairing the drive unit 50, the lower coupling 61 and bracket 77 are located above the walkway foundation members 31, 31 in this embodiment as well, so that workers do not need to enter the inspection platform 33 of the walkway 30, improving workability (of course, they may enter the inspection platform 33 to perform work). In this embodiment, there is no need to rotate the main shaft 70 to adjust its rotational position.

[0086] Next, the shafts in the jacks 45, 45 are raised until their tips come into contact with the lower surface of the bracket 77.

[0087] Next, the connection portion between the flange 573 and the flange 701 constituting the lower coupling 61 is separated, so that the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30.

[0088] In this state, for example, replacement or repair of the drive unit 50 is performed. At this time, since the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30, the motor direct-coupled reducer 53 of the drive unit 50 and the like can be easily and smoothly removed.

[0089] In this way, the bracket 77, the jacks 45, 45, and the walkway 30 on which they are placed are a holding means for holding the main shaft 70 removed from the drive unit 50 in the vicinity of the position where it was removed.

[0090] When replacement or repair of the drive unit 50 is completed, the connecting portions of the flanges 573 and 701 are connected, and the shafts of the jacks 45, 45 are lowered to separate them from the bracket 77, and the above-mentioned holding state is released. This completes the replacement or repair work.

[0091] In this embodiment, the main shaft 70 and other components can be held above the water surface, so there is no need to drain the water from the settling tank 10 as in the conventional case, and the work can be carried out easily and smoothly in a short time.

[0092] In addition, the bracket 77 may be a bracket configured such that, in addition to being a circular steel material, two straight steel materials are attached to the outer circumferential surface of the main shaft 70, which are opposed at 180° to each other, so as to protrude radially outward from the outer circumferential surface.

[0093] 8 is an enlarged schematic cross-sectional view of the essential parts of the connection between the drive unit 50 and the main shaft 70 according to still another embodiment of the present invention (however, the motor-direct-coupled reducer 53 part is omitted). In this embodiment, the same reference numerals are used for the same or corresponding parts as those in the embodiment shown in Figs. 1, 2 and 6. Note that matters other than those described below are the same as those in the embodiment shown in Figs. 1, 2 and 6.

[0094] In this embodiment, the outer diameter of the flange 701 of the main shaft 70 is expanded to form a circular flange expanded portion 701B, which serves as a support member on the main shaft 70 side, while jacks (jack mechanism) 47, 47 are installed on the underside of the flange expanded portion 701B on the upper surfaces of both walkway foundation members 31, 31, which serve as support members on the walkway 30 side.

[0095] The flange enlarged diameter portion 701B is installed at a position with a predetermined gap from the upper surfaces of the walkway foundation members 31, 31, and between them is a space S4 for installing a jack mechanism, spaced a predetermined distance apart.

[0096] When replacing or repairing the drive unit 50, the lower coupling 61 and the jacks 47, 47 are located above the walkway foundation members 31, 31 in this embodiment as well, so that the worker does not need to enter the inspection platform 33 of the walkway 30, improving workability (of course, the worker may enter the inspection platform 33 to perform the work). In this embodiment, there is no need to rotate the main shaft 70 to adjust its rotational position.

[0097] Next, the shafts in the jacks 47, 47 are raised until their tips come into contact with the lower surface of the flange enlarged diameter portion 701B.

[0098] Next, the connection portion between the flange 573 and the flange 701 constituting the lower coupling 61 is separated, so that the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30.

[0099] In this state, for example, replacement or repair of the drive unit 50 is performed. At this time, since the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30, the motor direct-coupled reducer 53 of the drive unit 50 and the like can be easily and smoothly removed.

[0100] In this manner, the flange enlarged diameter portion 701B, the jacks 47, 47, and the walkway 30 on which they are placed are a holding means for holding the main shaft 70 removed from the drive unit 50 in the vicinity of the position where it was removed.

[0101] When the replacement or repair of the drive unit 50 is completed, the connecting portion of the flange 573 and the flange 701 is connected, and the shafts of the jacks 47, 47 are lowered to separate them from the flange enlarged diameter portion 701B, and the above-mentioned holding state is released. This completes the replacement or repair work.

[0102] In this embodiment, the main shaft 70 and other components can be held above the water surface, so there is no need to drain the water from the settling tank 10 as in the conventional case, and the work can be carried out easily and smoothly in a short time.

[0103] Incidentally, the flange enlarged diameter portion 701B may be configured in a shape other than a circle, in which two straight steel members are formed so as to protrude radially outward from the outer periphery of the flange 701 that is opposed to each other by 180°.

[0104] Fig. 9(a) is an enlarged schematic cross-sectional view of a main part of a connection portion between a drive unit 50 and a spindle 70 according to still another embodiment of the present invention, and Fig. 9(b) is a view taken along the arrow EE in Fig. 9(a). In this embodiment, the same or corresponding parts as those in the embodiment shown in Figs. 1, 2 and 6 are denoted by the same reference numerals. Note that matters other than those described below are the same as those in the embodiment shown in Figs. 1, 2 and 6.

[0105] In this embodiment, a pair of brackets 49, 49 are installed and fixed to the upper surface of each of the walkway foundation members 31, 31 so as to follow the walkway foundation members 31, 31. Meanwhile, a pair of brackets 79, 79 are attached to the outer circumferential surface of the main shaft 70 so as to protrude radially outward from positions that are 180° opposed to each other. The brackets 49, 49 and the brackets 79, 79 are installed in positions that face each other with a narrow gap formed between them.

[0106] When replacing or repairing the drive unit 50, since the lower coupling 61 and brackets 49, 49, 79, 79 are located above the walkway foundation members 31, 31 in this embodiment as well, the worker does not need to enter the inspection platform 33 of the walkway 30, and the worker rotates the main shaft 70 to move the positions of both brackets 79, 79 to the position shown in Fig. 9(b), that is, the position where the longitudinal direction of both brackets 79, 79 intersects with the longitudinal direction of both brackets 49, 49. At this time, the brackets 79, 79 and brackets 49, 49 may be fixed with fixing means such as bolts and nuts.

[0107] Next, the connection portion between the flange 573 and the flange 701 constituting the lower coupling 61 is separated, so that the load of the main shaft 70 and the rotating arm 80 is supported on both brackets 49, 49 sides, i.e., on the walkway 30.

[0108] In this state, for example, replacement or repair of the drive unit 50 is performed. At this time, since the load of the main shaft 70 and the rotating arm 80 is supported by the walkway 30, the motor direct-coupled reducer 53 of the drive unit 50 and the like can be easily and smoothly removed.

[0109] In this manner, the brackets 79, 79, the brackets 49, 49 and the walkway 30 on which the brackets 49, 49 are placed are holding means for holding the main shaft 70 removed from the drive unit 50 in the vicinity of the position where it was removed.

[0110] When replacement or repair of the drive unit 50 is completed, the connecting portions of the flanges 573 and 701 are connected, and at this time the lower surfaces of the brackets 79, 79 are slightly raised and separated from the upper surfaces of the brackets 49, 49 to release the above-mentioned holding state. Specifically, the flange bolts that secure the flanges 573 and 701 are made longer in length, and the brackets 79, 79 are released from the loading state on the brackets 49, 49 by tightening the flange bolts. Conversely, the brackets 79, 79 are loaded and held on the brackets 49, 49 by loosening the flange bolts as described above. This completes the replacement or repair work.

[0111] In this embodiment, the main shaft 70 and other components can be held above the water surface, so there is no need to drain the water from the settling tank 10 as in the conventional method, and the work can be done easily and smoothly in a short time. The brackets 79, 79 may be formed in a disk shape.

[0112] FIG. 10 is a schematic side cross-sectional view showing an example of a central drive column type solid scraper (hereinafter referred to as "solid scraper") 1-2 installed in a sedimentation tank 100. As shown in the figure, the solid scraper 1-2 includes a settling tank 100 consisting of a circular water tank, a column 110 protruding from the bottom surface near the center of the settling tank 100, a drive unit 150 as a rotary drive mechanism installed on the top of the column 110 and its power transmission mechanism 160, a walkway 180 installed from the outer periphery of the settling tank 100 to the power transmission mechanism 160, a center cage (rotating member) 190 that surrounds the outer periphery of the column 110 and has an upper end connected to the power transmission mechanism 160 to rotate, and a rotating arm 200 attached to the lower part of the center cage 190. A scraper 201 for scraping off sludge settled at the bottom of the settling tank 100 and the like are attached to the rotating arm 200. A sludge discharge pipe 203 is attached to the center of the bottom of the sedimentation tank 100. A cylindrical center well 210 is installed around the center cage 190 of the sedimentation tank 100, and the tip of an inlet pipe 220 that introduces the water to be treated into the center well 210 is located therein. An inspection hatch 183 connected to an inspection stand 230 is formed in the walkway 180 around the power transmission mechanism 160. The inspection stand 230 and the power transmission mechanism 160 are installed at a position higher than the maximum water level HWL of the sedimentation tank 100.

[0113] Fig. 11 is an enlarged schematic cross-sectional view of the driving device 150, the power transmission mechanism 160, the vicinity of the upper part of the support column 110, and the vicinity of the upper part of the center cage 190, and Fig. 12 is a view taken along the line FF in Fig. 11, showing the positional relationship between the support column 110, the center cage 190 (its mounting flange portion 191), and the walkway 180. For convenience of illustration, the walkway 180 is shown by a dashed line.

[0114] As shown in Fig. 11, the drive unit 150 includes a motor direct-coupled reducer 151 and a drive shaft 153 of the motor direct-coupled reducer 151. The motor direct-coupled reducer 151 is attached to a reducer base 171, which will be described below. A gear 165 constituting a power transmission mechanism 160 is attached to the drive shaft 153, and a disk-shaped gear 167 constituting the power transmission mechanism 160 is engaged with the gear 165. A turning plate 169 constituting the power transmission mechanism 160 is fixed to the lower surface of the disk-shaped gear 167, and a mounting flange portion 191 at the upper end of a center cage 190 is detachably fixed to the lower surface of the turning plate 169.

[0115] The support 110 has a cylindrical support body 111. A substantially truncated cone-shaped base plate 113 constituting a power transmission mechanism 160 and the swivel plate 169 rotatably attached to the outer periphery of the upper part of the base plate 113 via a swivel plate bearing 115 are rotatably attached to the upper end of the support body 111. A reducer base 171 for mounting the motor-direct-coupled reducer 151 is attached to the upper end of the base plate 113.

[0116] Four brackets 117, 117, ... protrude radially outward at 90° intervals from the outer periphery of the upper part of the pillar body 111. The upper surface of each bracket 117, 117, ... protrudes to a position facing the lower surface of the mounting flange 191 of the center cage 190, and the space between the mounting flange 191 and the brackets 117, 117, ... is used as spaces S5, S5, ... for installing the jack mechanism.

[0117] The walkway 180 is configured so that a walkway center section 180A is attached to its tip, allowing an operator to move up to directly above the power transmission mechanism 160 and the support pillars 110. The walkway center section 180A can be attached and detached from the walkway 180 at the dividing line P1. Furthermore, L-shaped brackets 181, 181 protrude from both the left and right sides of the walkway 180. The tip sections of both brackets 181, 181 are positioned so that their undersides face the upper surfaces of the two corners of the mounting flange 191 of the center cage 190, and the space between them serves as the space S6 for installing the jack mechanism.

[0118] In the settling tank 100 shown in Fig. 10, a coagulant is added to the water to be treated introduced from the inlet pipe 220, and coagulated flocs are generated and allowed to sink to the bottom of the settling tank 100. At this time, the motor-direct-coupled reducer 151 is driven to rotate the disk-shaped gear 167, the swivel plate 169, the center cage 190, and the swivel arm 200 via the drive shaft 153, and the sediment is collected at the center of the bottom of the settling tank 100 and discharged to the outside through the sludge discharge pipe 203, and then transferred to the next process. On the other hand, the supernatant water from which the sediment has been removed is discharged to the outside through another pipe, etc., and transferred to the next process.

[0119] On the other hand, when replacing or repairing the drive unit 150, the power transmission mechanism 160, etc., a worker first enters the inspection platform 230 through the inspection hatch 183 of the walkway 180, and rotates the center cage 190 to move the positions of the brackets 117, 117, ... to the positions shown in Figure 12, that is, so that the middle portions of each side of the mounting flange 191 of the center cage 190 are positioned relative to the brackets 117, 117, .... At this time, the corners of the mounting flange 191 are positioned below the tips of the brackets 181, 181 of the walkway 180.

[0120] Next, jacks (jack mechanisms) 250, 250, ... are installed on top of the four brackets 117, 117, ..., i.e., in the spaces S5, S5, ... for installing the jack mechanisms, and the shafts in each of the jacks 250, 250, ... are raised until their tips come into contact with the underside of the mounting flange 191.

[0121] In addition, jacks (jack mechanisms) 260, 260 are installed on the two corners of the upper surface of the mounting flange 191, i.e., in the spaces S6, S6 for installing the jack mechanisms, and the shafts in each jack 260, 260 are raised until their tips abut against the undersides of each bracket 181, 181 of the walkway 180.

[0122] Then, for example, the fixation between the walkway central part 180A and the reduction gear base 171 is removed, the walkway central part 180A is separated from the walkway 180 and temporarily removed, and then the connection between the turning table 169 and the mounting flange 191 of the center cage 190 is cut off and the drive unit 150 and the like are removed. At this time, the load of the center cage 190 and the walkway 180 is held by the support 110 via the jacks 250, 260.

[0123] In this state, for example, the removed drive unit 150 and each member constituting the power transmission mechanism 160 are replaced or repaired. At this time, the load of the center cage 190 and the walkway 180 is supported by the support columns 110, so that the drive unit 150 and the power transmission mechanism 160 can be easily and smoothly replaced or repaired.

[0124] In this way, the brackets 117, 117, ... and the jacks (jacking mechanism) 250, 250, ... constituting the support member on the support column 110 side, and the mounting flange 191 constituting the support member on the center cage 190 side are holding means for holding the center cage 190 from which the drive unit 150, the power transmission mechanism 160, etc. have been removed in the vicinity of the position where they were removed. The mounting flanges 191 and the jacks (jacking mechanism) 260, 260 constituting the support member on the center cage 190 side, and the brackets 181, 181 constituting the support member on the walkway 180 side are second holding means for holding the walkway 180 from which the drive unit 150, the power transmission mechanism 160, etc. have been removed in the vicinity of the position where they were removed. All of these holding means and the second holding means are above the water surface of the settling tank 100.

[0125] After replacement or repair of the drive unit 150, power transmission mechanism 160, etc. is completed, each component is attached to its original position, and then the tips of the shafts in the jacks 260, 260 are lowered to separate them from the bottom surfaces of the brackets 181, 181 (or the jacks 260, 260 are removed), and then the tips of the shafts in the jacks 250, 250, ... are lowered to separate them from the bottom surface of the mounting flange 191 (or the jacks 250, 250, ... are removed), and the support columns 110 release the center cage 190 and the walkway 180 from their holding state. This completes the replacement or repair work.

[0126] In this embodiment, the center cage 190 and other components can be held above the water surface, so there is no need to drain the water from the sedimentation tank 100 as in the conventional case, and this work can be carried out easily and smoothly in a short time.

[0127] The bracket 117 may be formed in another shape, such as a circle. Also, instead of the mounting flange 191, a bracket may be provided protruding from the outer periphery of the center cage 190, and the holding means may be formed by the bracket, the brackets 117, 117, ... on the support column side, and the jacks 250, 250, .... Also, by reducing the gaps in the jack mechanism installation space S5 and the jack mechanism installation space S6, the jacks 250, 250, ... and the jacks 260, 260 may be omitted.

[0128] The solid scraper 1-2 shown in Figures 10 to 12 is an example of a centrally driven column type solid scraper in which a rotary drive mechanism such as a drive unit 150 or a power transmission mechanism 160 is installed on the top of a support 110 protruding from the bottom side near the center of the settling tank 100, and the rotary drive mechanism drives the center cage 190, which is a rotating member. However, the present invention can also be applied to a peripherally driven column type solid scraper in which a rotating plate is installed as a rotary drive mechanism (power transmission mechanism) at a position above the water surface of a support protruding from the bottom side near the center of the tank, a rotating body such as a walkway is attached to this rotating plate and supported so as to be freely rotatable, a drive unit is attached to the outer periphery of the rotating body to drive the tip of the rotating body at the outer periphery of the settling tank, and the center cage (rotating member) attached to the rotating body and the rotating arm and scraper attached to the center cage are thereby rotated.

[0129] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the claims and the technical ideas described in the specification and drawings. Any shape or structure not directly described in the specification and drawings is within the scope of the technical ideas of the present invention as long as it has the function and effect of the present invention. In addition, the embodiments described above and shown in each drawing can be combined with each other as long as there is no contradiction in their purpose and configuration. In addition, even a part of the contents described above and each drawing can be an independent embodiment, and the embodiment of the present invention is not limited to one embodiment combining the above description and each drawing. [Explanation of symbols]

[0130] 1-1 Solids collector (centrally driven suspended solids collector) 10 Sedimentation tank (water tank) 30 Walkway (holding means) 31 Walkway foundation members (steel, support members, retaining means) 35, 37, 41, 49 Walkway side brackets (support members, holding means) 39 Jack bolt (jack mechanism, support member, holding means) 43, 45, 47 Jack (jack mechanism, support member, holding means) 50 Drive device (rotation drive mechanism) 70 Main shaft (rotating part) 71, 73, 75, 79 Bracket on spindle side (support member, holding means) 80 Swivel Arm 81 Scraper 701A, 701B Flange expansion portion (support member, holding means) S1-S5 Space for installing jack mechanism S6 Space for installation of second jack mechanism 1-2 Solids collector (centrally driven column type solids collector) 100 Sedimentation tank (water tank) 110 Post 117 Bracket (support member, holding means) 150 Drive unit (rotary drive mechanism) 160 Power transmission mechanism (rotary drive mechanism) 180 Walkway 181 Bracket (support member, second holding means) 183 Inspection hatch 190 Center cage (rotating member) 191 Mounting flange (support member, holding means, second holding means) 200 Swivel Arm 201 Scraper 230 Inspection stand 250 Jack (jack mechanism, support member, holding means) 260 Jack (jack mechanism, support member, second holding means)

Claims

1. A solids scraper includes a rotary drive mechanism, which is at least a drive unit or a power transmission mechanism thereof, disposed above the water surface near the center of a water tank, a main shaft, which is rotated by the rotary drive mechanism and has a scraper attached thereto, disposed in the water tank, and scrapes solids in the water tank with the scraper, a connecting portion for detachably connecting the main shaft and the rotation drive mechanism is provided at a position of the main shaft above the water surface of the water tank; a holding means for holding the main shaft at the connection portion at a position where the main shaft is removed from the rotation drive mechanism; The holding means is configured to hold the support member on the spindle side at a position above the water surface of the water tank by a support member on the walkway side installed on the top of the water tank, The support member on the spindle side is constituted by a bracket protruding radially outward from the spindle, The support member on the walkway side is composed of a steel material constituting the walkway or a bracket attached to the steel material, A solid scraper characterized in that the bracket on the main shaft side is temporarily fixed or placed on the steel material or bracket on the walkway side to hold the main shaft.

2. The solids scraper according to claim 1, The solid scraper is a centrally driven suspended solid scraper in which the rotary drive mechanism has the drive unit and the main shaft is suspended from the drive unit.

3. The solids scraper according to claim 1 or 2, This solid scraper is characterized in that the holding means is configured such that a bracket which is a support member on the main shaft side is placed on top of a bracket which is a support member on the walkway side, and space for installing a jack mechanism is provided between the bracket which is a support member on the walkway side and the bracket which is a support member on the main shaft side.

4. A solids scraper comprising: a rotary drive mechanism consisting of at least a drive unit or a power transmission mechanism thereof, disposed above the water surface near the center of a water tank; a main shaft rotated by the rotary drive mechanism and having a scraper attached thereto, disposed within the water tank; and a solids scraper for scraping up solids in the water tank using the rotary drive scraper, The solid scraper is a centrally driven suspended solid scraper in which the rotary drive mechanism has the drive unit and the main shaft is suspended from the drive unit, a connecting portion for detachably connecting the main shaft and the drive device at a position above the water surface of the water tank on the main shaft; the connection portion is configured to connect a flange provided on a drive shaft of the drive device and a flange provided on the main shaft, a holding means for holding the main shaft at the connection portion in a position where the main shaft is removed from the drive device; The holding means is configured to hold the support member on the spindle side at a position above the water surface of the water tank by a support member on the walkway side installed on the top of the water tank, The support member on the spindle side is configured by a flange enlarged portion obtained by enlarging an outer diameter of a flange provided on the spindle, The support member on the walkway side is composed of a steel material constituting the walkway or a bracket attached to the steel material, A solid scraper characterized in that the main shaft is held by temporarily fixing or placing the flange expansion portion on the steel material constituting the walkway or on a bracket attached to the steel material.

5. A solids scraper as described in claim 4, This solid scraper is characterized in that the retaining means is configured so that a flange expansion portion, which is a support member on the spindle side, is placed on a bracket, which is a support member on the walkway side, and space for installing a jack mechanism is provided between the bracket, which is a support member on the walkway side, and the flange expansion portion, which is a support member on the spindle side.

6. A solids scraper comprising: a rotary drive mechanism consisting of at least a drive unit or a power transmission mechanism thereof, disposed above the water surface near the center of a water tank; a rotating member rotated by said rotary drive mechanism and equipped with a scraper, disposed within said water tank; and a solids scraper for scraping up solids within the water tank using said rotary drive scraper, a connecting portion for detachably connecting the rotating member and the rotation drive mechanism is provided at a position of the rotating member above the water surface of the water tank; a holding means for holding the rotating member at the connection portion in a position where the rotating member is removed from the rotation drive mechanism; The solid scraper is a centrally driven column type solid scraper or a peripherally driven column type solid scraper, in which the rotary drive mechanism is installed on the upper part of a column protruding from the bottom side near the center of the water tank, and a center cage is installed to surround the outer periphery of the column as the rotating member rotated by the rotary drive mechanism, The holding means is configured to hold the support member on the support column side at a position above the water surface of the aquarium, The support member on the support pillar side is constituted by a bracket extending radially outward from the support pillar, A solid scraper, characterized in that the center cage is held by temporarily fixing or placing a support member on the center cage side on the bracket on the support column side.

7. 7. The solids scraper according to claim 6, This solid scraper is characterized in that the retaining means is configured so that a support member on the center cage side is placed on top of the bracket on the support column side, and space for installing a jack mechanism is provided between the bracket on the support column side and the support member on the center cage side.

8. 8. A solid scraper according to claim 6 or 7, A solid scraper characterized in that the support member on the center cage side further has a second holding means for holding a bracket provided on the walkway installed on the water tank as a support member on the walkway side at a position above the water surface of the water tank.

9. 9. The solids scraper according to claim 8, This solid scraper is characterized in that the second holding means is configured such that a bracket on the walkway side is placed on top of a support member on the center cage side, and a space for installing a second jack mechanism is provided between the support member on the center cage side and the bracket on the walkway side.

10. A method for replacing a drive mechanism of a solids collector, comprising: a rotary drive mechanism consisting of at least a drive unit or a power transmission mechanism thereof is installed above the water surface near the center of a water tank; a rotary member which is rotated by the rotary drive mechanism and has a scraper attached thereto is disposed in the water tank; and the solids in the water tank are scraped by the scraper which is rotated, a holding step of holding the rotating member at a position above the water surface of the water tank; a removing step of removing the rotation drive mechanism from the rotating member held in the holding step at a position above the water surface of the water tank; an attachment step of attaching the repaired or replaced rotation drive mechanism to the rotating member from which the rotation drive mechanism was removed in the removal step at a position above the water surface of the water tank; a release step of releasing the rotation member held at a position above the water surface of the water tank in the holding step; A method for replacing a drive mechanism of a solids collector, comprising the steps of:

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