JP2006307445A - Dust collector and dust collector arrangement structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust collector which can reduce deposition of sediment on an upstream side of a bar screen, and to provide a dust collector arrangement structure. <P>SOLUTION: The dust collector 13 is provided with a bar screen 15 which is formed by arranging a plurality of rod members 4 in parallel with each other, and slantingly erecting the rod members in water, and a plurality of rakes 3 which are moved upward from a lower portion along the bar screen 15. The bar screen 15 has its lower end (opening/closing portion 16) openable by rotation, vertical movement, or the like. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dust removing device disposed on the upstream side of a sand basin of a sewage treatment facility and a structure for arranging the dust removing device.

  The sand basin is installed in sewage treatment facilities such as pump stations and final treatment plants, and sediment is removed from sewage containing sediment. The sewage flowing into such a sand basin contains impurities such as large-sized dust (trash) in addition to the earth and sand to be removed by sedimentation. In order to prevent inflow of large contaminants in such a form into the sand basin, a dust removing device is disposed on the upstream side of the sand basin (see, for example, Patent Document 1).

For example, as shown in FIG. 6, such a dust removing device 1 has a bar screen 2 in which a plurality of bar members are arranged in parallel, and protrudes in a comb-like shape on the bar screen 2 so as to extend from below to above. And a plurality of rakes 3 that travel toward the vehicle. The rake 3 is configured to move upward from below, and is fixed via, for example, a main chain (main chain) 6 spanned between the upper sprocket 4 and the lower sprocket 5 as shown in the figure. As a result, the rake 3 travels from the lower side to the upper side along the bar screen 2 by a motor (not shown). Such a dust removing device 1 is provided in a flow path 7 such as a trough on the upstream side of the sand basin, for example. It is arranged. Thereby, the contaminants flowing along with the sewage according to the arrow A are captured by the bar screen 2, and the captured contaminants are swept up by the rake 3 and removed.
Japanese Patent No. 2957434 (Fig. 4)

  However, in such a dust removing device 1, the lower end 2 a of the bar screen 2 is disposed to be grounded to the bottom surface 7 a of the flow path 7 in order to reliably remove impurities flowing into the water. For this reason, the earth and sand flowing together with impurities in the water is accumulated on the upstream side of the bar screen 2 to form the sand settling 8 as shown in FIG. When the sedimentation sand 8 is accumulated on the upstream side of the bar screen 2, the sand sedimentation 8 in this portion cannot collect sand to a sedimentation pit.

  For this reason, in order to remove the sedimentation sand 8 accumulated on the upstream side of the bar screen 2, for example, if an injection device (spray) for injecting water is disposed on the upstream side of the dust removing device 1, Although it is possible to wash away to the pit, there is a limit to washing away by spray in a sand basin with a large amount of inflow of sediment and a slow flow rate.

  Therefore, an object of the present invention is to provide a dust removing device and an arrangement structure of the dust removing device capable of suppressing sediment accumulation on the upstream side of the bar screen.

  The present invention includes a bar screen formed by arranging a plurality of bar members in parallel and tilted in water, and a plurality of rakes traveling from below to above along the bar screen. The bar screen is configured to be openable / closable by rotating or vertically moving the bar screen.

  Further, the present invention is a bar screen formed by arranging a plurality of bar members in parallel and tilted in water, and a plurality of bars that run from below to above along the bar screen. In the dust removing apparatus provided with the rake, the bar screen has a missing portion of the bar at the lower end of the bar screen.

  Further, the present invention is a bar screen formed by arranging a plurality of bar members in parallel and tilted in water, and a plurality of bars that run from below to above along the bar screen. In this case, the bar screen is supported so as to be movable up and down.

  Further, the present invention is a bar screen formed by arranging a plurality of bar members in parallel and tilted in water, and a plurality of bars that run from below to above along the bar screen. And a dust removing device provided on the upstream side of the sand settling basin of the sewage treatment facility, wherein a space is provided at the lower end of the bar screen. It is an arrangement structure of a dust removing device.

  ADVANTAGE OF THE INVENTION According to this invention, the arrangement | positioning structure of the dust removal apparatus and dust removal apparatus which can suppress the accumulation of earth and sand to the upstream of a bar screen can be provided.

  Embodiments of the present invention will be described below with reference to examples shown in the drawings, but the present invention is not limited to the following examples. In addition, in the part member described in the background art, the same or equivalent part member as in the present invention may be given the same number, and detailed description thereof may be omitted.

  First, FIG. 1 is an example in which a dust removing device according to an embodiment of the present invention is disposed, for example, on the upstream side of a sand basin of a pump station.

  In FIG. 1, reference numeral 10 denotes a sand basin, and a trough 12 is laid on the upstream side 11 of the sand basin 10, thereby securing a flow path 7. The trough 12 is provided with a dust removing device 13 according to an embodiment of the present invention. This dust removing device 13 is a front rake type in which a rake 3 is arranged on the upstream side (front side) of a bar screen 15 in which a plurality of bar-like members 14 are arranged in parallel. These rakes 3... Are fixed so as to rotate or rotate in accordance with the rotation of the main chain 6 disposed between the lower sprocket 5 and the upper sprocket (not shown).

  In the dust removing device 13, an openable / closable opening / closing portion 16 is provided at the lower end of the bar screen. In this embodiment, the opening / closing portion 16 is opened / closed by a link mechanism using an opening / closing drive device 17.

  Here, the opening / closing drive device 17 is connected to a rotation support portion 18, a cylinder body portion 19 pivotally supported by the rotation support portion 18, and a piston rod 20 of the cylinder body portion 19. The rotation support part is fixed to an arbitrary support body so that the cylinder main body part 19 is disposed on the water surface. Further, in the opening / closing drive device 17, the piston rod 20 and the arm 21 are connected via a support shaft 22 serving as a movement center, and the arm 21 and the opening / closing portion 16 are connected by a support shaft 23 serving as a movement center. The member 14 and the opening / closing part 16 are connected by a support shaft 24 as a fixed center.

  According to the dust removing device 13 configured in this way, in a state where the piston rod 20 is extended from the cylinder body 19 (solid line), the opening / closing portion 16 is disposed in a substantially vertical direction from the support shaft 24 as a fixed center. Thus, the space between the bottom surface 12a of the trough 12 and the lower end 15a of the bar screen 15 (or the opening / closing portion 16) is substantially closed (see FIG. 2A).

  In a state where the piston rod 20 is housed in the cylinder body 19 and the piston rod 20 is contracted (two-dot chain line: imaginary line), the opening / closing portion 16 is substantially horizontal in the downstream direction from the support shaft 24 as the fixed center. And a height h is opened between the trough bottom surface 12a and the lower end 15a of the bar screen 15 (or the opening / closing portion 16) (see FIG. 2B).

  Thereby, in a state where the piston rod 20 is extended, the rod-like member 14 including the opening / closing portion 16 functions as the bar screen 15 and captures impurities flowing from the upstream side. The trapped foreign matter causes the main chain 6 to be rotated by the rotation of the sprockets 4 and 5 by rotating a motor (not shown), and the tip of the rake 3 is lifted up by the rod-like member 14. Thereby, the foreign substance caught by the bar screen 15 can be removed.

  The sand settling 8 may accumulate on the upstream side of the opening / closing part 16, but when the piston rod 20 is contracted, the opening / closing part 16 rotates to the downstream side while the opening / closing part 16 is shown in FIG. Thus, it rotates in a substantially horizontal direction. As a result, the height h is opened between the trough bottom surface 12a and the lower end 15a of the bar screen 15 (or the opening / closing portion 16), the bar screen 15 as a resistance member for blocking the sand set 8 is eliminated, and the accumulated sand set 8 is removed. It can be poured into the sand basin 10 on the downstream side.

  Here, the height h may be appropriately determined according to the condition of the sand basin. For example, since the thickness of the sand sediment generally deposited by one rain is about 200 mm, the height h is, for example, It is preferable to set within a range of 100 mm to 300 mm, particularly within a range of 200 mm to 300 mm.

According to such a dust removing device 13, since the opening / closing part 16 is rotated downstream, even if a large amount of sand settling 8 accumulates on the upstream side of the opening / closing part 16, these sand settling operations are performed in the opening operation of the opening / closing part 16. The opening / closing part 16 can be reliably opened without interference.
(Modification)
In the above embodiment, the front rake type dust removing device has been described. However, in the present invention, the lower end of the bar screen 15 may be configured to be openable and closable, so that the back rake type dust removing device is not limited to the front rake type. There may be.

  In the embodiment described above, the opening operation of the opening / closing portion 16 is configured to rotate toward the downstream side. However, in the dust removing device 13 of the present invention, the opening / closing portion 16 is configured to rotate to the upstream side. It is not excluded. For example, in the back rake type dust removal device, if the opening / closing part 16 is configured to rotate upstream, the lump of the sand settling sand 8 upstream of the bar screen is actively collapsed by the opening operation of the opening / closing part 16. Can do.

  Further, the opening / closing of the opening / closing part 16 is not limited to a rotary type, and for example, the opening / closing part 16 may be configured to be openable / closable by moving up and down (up and down movement). In any case, in the dust removing device 13 of the present invention, the sand settling 8 can be discharged toward the sand settling basin 10 by opening the opening / closing part 16.

  Further, as will be apparent from the examples described later, the sand sediment 8 can be actively washed away by disposing the spray 26 for washing the sand sediment 8 at an appropriate position.

  FIG. 3 is a front view for explaining the arrangement structure of the dust removing apparatus according to the embodiment of the present invention, and illustration of other members excluding the bar screen is omitted.

  The dust removing apparatus 1 includes a bar screen 2 formed by a plurality of rod-like members 14 spanned with a predetermined interval w between an upper horizontal frame and a lower horizontal frame 141 (not shown). The bar screen 2 is formed of a plurality of bar-shaped members 14 arranged in parallel, and a lower horizontal frame 141 is fixed to the lower ends of the bar-shaped members 14.

  At both corners of the trough 12, foundations 25 having a height h are disposed. With this base 25 as a base, the bar screen 2 (or dust removing device 1) is disposed on the base 25, and a space of height h is formed between the lower surface 141a of the lower horizontal frame 141 and the trough bottom surface 12a. Has been.

According to such an arrangement structure of the dust removing device, since a space portion having a height h is formed below the bar screen 2, even if earth and sand are included in the sewage flowing through the flow path of the space portion, No special resistance is generated between the bar screen 2. Thereby, earth and sand do not accumulate on the upstream side of the bar screen 2.
(Modification)
In the above embodiment, details of the rake 3 are not mentioned. However, in any of the front rake type and the back rake type dust removing devices, a space is provided at the lower end of the bar screen. Needless to say, the operational effects of the embodiments are expected.
(Control example)
As a configuration that seems to have substantially the same effect as that of the second embodiment, instead of disposing the base 25, the trough bottom surface 12a on the lower side of the lower horizontal frame 141 is excavated and below the lower horizontal frame 141. A configuration in which a space is provided in the space is also conceivable. According to such a configuration, a space having a height corresponding to excavation is formed between the lower horizontal frame 141 and the trough bottom surface 12a, so that the sewage flowing through the flow path of this space portion contains earth and sand. However, since no special resistance is generated between the bar screen 2 and the sand, no sediment is deposited on the upstream side of the bar screen 2.

  However, when such a trough bottom surface 12a is excavated, another problem of water leakage from the trough 12 may occur. Further, it is assumed that only the lower surface of the bar screen 2 is excavated, and the excavated portion becomes a pit (recess or groove) to promote sedimentation of the sand.

On the other hand, if the base 25 is provided and the dust removing device 1 is provided on the base 25 as in the embodiment, the trough bottom surface 12a is not affected.
(Modification)
In the above embodiment, a pair of bases 25 are provided at both corners, but this number is not particularly limited. For example, in addition to both corners, for example, the bases 25 may be disposed at three locations on the trough bottom surface 12a in the center. However, if the number of the bases 25 is increased, the bases 25 become resistance and promote sedimentation of sand. Sometimes. In this regard, even when a large number of bases 25 are provided, it is necessary to set a sufficiently large interval between the adjacent bases 25 and 25. For example, if the separation distance between the bases 25 and 25 is set to 500 mm or more, even if a large number of the bases 25 are provided, the sediment 25 is less likely to accumulate on the base 25 to generate the sedimentation 8.

  FIG. 4 is a front view for explaining the dust removing apparatus and the arrangement structure thereof according to the embodiment of the present invention, and the other members except the bar screen are not shown in the same manner as FIG.

  The dust removing device 1 'includes a bar screen 2' formed by a plurality of rod-like members 14 spanned with a predetermined interval w between an upper horizontal frame and a lower horizontal frame 141 (not shown). Yes. The bar screen 2 ′ is formed of a plurality of bar-like members 14 arranged in parallel, and a lower horizontal frame 141 is fixed to the lower ends of the bar-like members 14.

  The dust removing device 1 ′ (or bar screen 2 ′) is directly disposed on the trough bottom surface 12a. Here, in this bar screen 2 ′, a part of the lower end of the bar-like member 14 is cut off, and a space of height h is provided at the lower end 14 a of the bar-like member 14.

According to such a dust removing device 1 ′, a space portion having a height h is formed below the bar screen 2 ′. Therefore, even if earth and sand are contained in the sewage flowing through the trough 12, No special resistance is generated between the bar screen 2 'and the missing portion of the bar-shaped member 14 having a height h formed in the above. Thereby, earth and sand do not accumulate on the upstream side of the bar screen 2.
(Modification)
In the above embodiment, all of the rod-like members 14 are cut off, but by cutting one of the adjacent rod-like members 14, 14, the interval between the rod-like members 14, 14 is increased. As a result, the resistance due to the rod-like members 14 is reduced, and the amount of sedimentation on the upstream side of the bar screen 2 can be reduced.

  In general, in the bar screen 2, the interval w between the adjacent rod-shaped members 14 and 14 is set to about 25 mm to 100 mm, but by setting the interval w wide to 200 mm or more, particularly preferably 300 mm or more, the rod-shaped member The resistance at 14 can be significantly reduced, and sedimentation can be reduced.

  Further, in the above embodiment, the details of the rake 3 are not mentioned. However, in either the front rake type or the back rake type dust removing device, a space is provided at the lower end of the bar screen. Needless to say, the effects of the present embodiment are expected.

  By arranging the bar screen itself or the entire dust removing device so as to move up and down by a height h, a space having a height h can be provided at the lower end of the bar screen. If constituted in this way, the same operation effect as the above-mentioned example is expected.

  FIG. 5 is a diagram for explaining an application example of the dust removing apparatus or the arrangement structure of the dust removing apparatus according to the embodiment of the present invention.

  In FIG. 5, reference numerals 1 and 2 are codes corresponding to the dust removing apparatus according to the conventional example, and numerals 13 and 15 are codes corresponding to the dust removing apparatus according to the present invention.

  Here, in the dust remover 1 (or bar screen 2) according to the conventional example, the bar screen 2 is placed on a base (not shown) and has a space of height h at the lower end thereof.

  Further, in the dust removing device 13 (or bar screen 15) according to the present invention, the whole or a part thereof moves up and down, or a part of the lower end of the bar screen 15 (opening / closing unit 16 not shown) is opened. Thus, a space having a height h is formed at the lower end of the bar screen 15.

  Further, a spray 26 is provided on the upstream side of the bar screen 2 (15) toward the space of the height h to push the sediment.

  According to such a dust removing device or the arrangement structure of the dust removing device, since the space (gap) is formed at the lower end of the bar screen 2 (15), the sedimentation of the sand is reduced and the sediment is deposited. In this case, it is possible to wash away the settling sand toward the settling basin 10 by spraying the spray 26.

  The spray 26 may be sprayed while the water surface is maintained, and sewage convection from the drain pit (not shown) to the settling basin 10 is drained and the water surface position is lowered or substantially. Alternatively, the spray 26 may be sprayed with the trough 12 in a dry state to wash away the sediment deposited near the dust removing device.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change or the like without departing from the gist of the present invention. included.

  For example, in the above embodiment, the rake 3 is traveling from the lower side to the upper side by the rotation of the main chain 6, but in the present invention, the rake 3 moves the bar screen from the lower side to the upper side. The driving mechanism is not limited to the mechanism using the main chain 6 as long as the foreign matter captured by the bar screen can be lifted up by traveling toward the vehicle.

  As described above, the structure in which the dust removing device is disposed on the upstream side of the sand settling basin that is grounded to the sewage treatment facility such as the terminal treatment plant has been described. Therefore, it can be used in a drying facility (low pressure sand collection facility) that discharges all of the water and sand in the sand basin.

  In addition, according to the arrangement structure of the dust removing device of the second embodiment, it can be configured by raising the foundation without substantially modifying the structure of the existing dust removing device or the bar screen. General versatility can be expected. Also, no sedimentation is deposited near the lower sprocket.

  In addition, the dust removing apparatus according to the third embodiment can be configured by simply removing a part of an existing bar screen, so that versatility can be expected.

  Further, according to the arrangement structure of the dust removing device of the fifth embodiment, by arranging the spray 26, the sand settling near the dust removing device can be reliably guided to the sand settling basin or the sand settling pit.

It is sectional drawing explaining the principal part of the dust removal apparatus which concerns on the Example of this invention. FIG. 2A is a rear view for explaining the movement of the bar screen of FIG. 1, FIG. 2A illustrates a situation where the opening / closing part is closed, and FIG. 2B is a situation where the opening / closing part is opened. Is explained. It is a front view explaining the arrangement | positioning structure of the dust removal apparatus which concerns on the Example of this invention. It is a front view explaining the principal part of the dust removal apparatus which concerns on the Example of this invention. It is sectional drawing explaining the arrangement | positioning structure of the dust removal apparatus which concerns on the Example of this invention. It is sectional drawing explaining the dust removal apparatus which concerns on a prior art example, and its arrangement | positioning structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Dust removal apparatus 1 ': Dust removal apparatus 2: Bar screen 2a: Lower end 2': Bar screen 3: Rake 4: Upper sprocket 5: Lower sprocket 6: Main chain 7: Flow path 7a: Bottom face 8: Sand settling 10: Settling pond 11: Upstream side 12: Trough 12a: Trough bottom surface 13: Dust removal device 14: Rod-like member 14a: Lower end surface 141: Lower horizontal frame 15: Bar screen 15a: Bar screen lower end 16: Opening / closing section 17: Opening / closing drive device 18: Rotation Support part 19: Cylinder body part 20: Piston rod 21: Connecting member (arm)
22: Support shaft (moving center)
23: Support shaft (moving center)
24: Support shaft (fixed center)
25: Foundation (basic part)
26: Spray

Claims (5)

A bar screen formed by arranging a plurality of bar members in parallel and tilted in water, and a plurality of rakes that run from below to above along the bar screen. In a dust removal device,
The dust removing device, wherein the bar screen is configured such that a lower end portion thereof can be opened and closed by rotation or vertical movement. A bar screen formed by arranging a plurality of bar members in parallel and tilted up in the water, and a plurality of rakes traveling from below to above along the bar screen. In the dust remover,
The dust removing device, wherein the bar screen has a missing portion of the bar at a lower end thereof. A bar screen formed by arranging a plurality of bar members in parallel and tilted in water, and a plurality of rakes that run from below to above along the bar screen. In a dust removal device,
The dust removing device, wherein the bar screen is supported to be movable up and down. A bar screen formed by arranging a plurality of bars in parallel, and tilted in water,
In the dust removing device disposition structure in which a dust removing device including a plurality of rakes traveling from below to above along the bar screen is disposed on the upstream side of the sand basin of the sewage treatment facility,
An arrangement structure of a dust removing device, wherein a space is provided at a lower end of the bar screen. In the arrangement structure of the dust removing apparatus or the arrangement structure of the dust removing apparatus according to claim 4, wherein the dust removing apparatus according to any one of claims 1 to 3 is disposed upstream of a sand basin of a sewage treatment facility.
An arrangement structure of a dust removing device, characterized in that a water supply nozzle is provided on the upstream side of the bar screen toward the lower end of the bar screen to push the sediment deposited on the lower end of the bar screen.

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