Screening device

Abstract

A screening device for separating out and removing contaminants from wastewater includes two continuous conveyors, which are mounted with clearance from each other. Each has a drive wheel that is guided on a circular path and includes a fixedly situated bar screen, which includes multiple mutually spaced grating bars for removing contaminants from the wastewater. Each bar screen includes multiple clearing elements, which are connected to the conveyor for removing from the bar screen the contaminants that have been separated out by the bar screen. The bar screen forms a fixed screen surface that extends, in the intended installation position of the screening device, essentially in the flow direction of the wastewater reaching the screening device.

Claims

1. A screening device for separating out and removing contaminants from wastewater comprising: a frame including a first side defining a first top and a first bottom that is spaced apart in a vertical direction from the first top, a second side defining a second top and a second bottom that is spaced apart in the vertical direction from the second top, wherein the second side is spaced apart from the first side in a transverse direction, which is normal to the vertical direction; a rigid bar screen carried by the frame; wherein the rigid bar screen includes a plurality of bar members; wherein each of the plurality of bar members is defined by a transition section that is contiguous with and between a first leg section at a first end of the bar member and a second leg section at a second end of the bar member opposite the first end of the bar member, and wherein each bar member is configured so that the first leg section is spaced apart in the transverse direction from the second leg section; wherein each of the plurality of bar members is successively spaced apart in a longitudinal direction from each other of the plurality of bar members, wherein the longitudinal direction is normal to both the vertical direction and the transverse direction; wherein each adjacent pair of the plurality of bar members defines therebetween an opening in the rigid bar screen, wherein the opening defines a continuous channel between both first leg sections, transition sections and second leg sections of each adjacent pair of the plurality of bar members; and a channel clearing mechanism that includes a first continuous drive means and a second continuous drive means spaced apart in the longitudinal direction from the first continuous drive means; wherein the channel clearing mechanism includes a plurality of clearing elements connected to the first and second continuous drive means, each clearing element including a plurality of tines disposed in an alignment that is normal to the longitudinal direction, each of the tines in each clearing element being disposed to move within a respective one of the continuous channels of the rigid bar screen and configured for removing the contaminants from the respective one of the continuous channels; wherein the channel clearing mechanism includes an upper drive wheel carried by the frame and rotatable about an axis of rotation extending along the longitudinal direction, wherein the upper drive wheel engaging the first continuous drive means and the second continuous drive means to move the first continuous drive means and the second continuous drive means during rotation of the upper drive wheel; wherein the channel clearing mechanism includes a first guide disposed near the transition sections of the plurality of bar members and defining a transition guide path therebetween; wherein the channel clearing mechanism includes a second guide disposed near the second leg sections of the plurality of bar members and defining a return guide path therebetween, wherein the second guide is disposed spaced apart from both the first guide and the upper drive wheel in both the vertical direction and the transverse direction; and wherein the first continuous drive means is disposed to pass through the transition guide path and the return guide path in the course of clearing the continuous channels between both transition sections and second leg sections of each adjacent pair of the plurality of bar members.

2. The screening device as claimed in claim 1, wherein each of the first and second drive wheels is mounted so as to be rotatable about rotational axes, wherein each of the rotational axes extends in the longitudinal direction.

3. The screening device as claimed in claim 1, further comprising a frame carrying the bar screen and defining an inlet opening configured and disposed for receiving wastewater flowing in the longitudinal direction.

4. The screening device as claimed in claim 3, wherein the screening device comprises a barrier wall spaced apart in the longitudinal direction from the inlet opening.

5. The screening device as claimed in claim 4, wherein the barrier wall extends transversely or obliquely to the longitudinal direction.

6. The screening device as claimed in claim 4, wherein the bar screen extends between the inlet opening of the frame and the barrier wall.

7. The screening device as claimed in claim 4, wherein the second continuous drive means is situated closer to the barrier wall than is situated the first continuous drive means.

8. The screening device as claimed in claim 3, wherein the bar screen has an essentially U-shape or V-shape as viewed at the inlet opening.

9. The screening device as claimed in claim 1, wherein each of the continuous drive means is guided with the aid of at least one of: an upper drive wheel, a central drive wheel, or a drive guide.

10. The screening device as claimed in claim 9, wherein each of the continuous drive means is guided with the aid of a runner.

11. The screening device as claimed in claim 9, further comprising: a first rail disposed to guide the first continuous drive means; and a second rail disposed to guide the second continuous drive means.

12. The screening device as claimed in claim 1, wherein the bar screen comprises a screen trough as well as two bar screen sections, each bar screen section adjoining the screen trough on a respective one of the opposite sides of the screen trough.

13. The screening device as claimed in claim 12, wherein each of the two bar screen sections extends in a straight line, at least along a partial section thereof, and proceeding from the screen trough.

14. The screening device as claimed in claim 12, wherein one of the bar screen sections extends downward from an upper end section to the screen trough, and wherein the other one of the bar screen sections extends upward from the screen trough.

15. The screening device as claimed in claim 1, wherein each of the first and second continuous drive means is selected from the following: drive chains, drive belts, or a drive cable.

16. A screening device as in claim 1, wherein the frame carries the rigid bar screen with transition sections of each of the plurality of bar members disposed between the first top and the first bottom of the frame.

17. A screening device for separating out and removing contaminants from wastewater comprising: a frame including a first side defining a first top and a first bottom that is spaced apart in a vertical direction from the first top, a second side defining a second top and a second bottom that is spaced apart in the vertical direction from the second top, wherein the second side is spaced apart from the first side in a transverse direction, which is normal to the vertical direction; a rigid bar screen carried by the frame; wherein the rigid bar screen includes a plurality of bar members; wherein each of the plurality of bar members is defined by a transition section that is contiguous with and between a first leg section at a first end of the bar member and a second leg section at a second end of the bar member opposite the first end of the bar member, and wherein each bar member is configured so that the first leg section is spaced apart in the transverse direction from the second leg section; wherein each of the plurality of bar members is successively spaced apart in a longitudinal direction from each other of the plurality of bar members, wherein the longitudinal direction is normal to both the vertical direction and the transverse direction; wherein each adjacent pair of the plurality of bar members defines therebetween an opening in the rigid bar screen, wherein the opening defines a continuous channel between both first leg sections, transition sections and second leg sections of each adjacent pair of the plurality of bar members; and a channel clearing mechanism that includes a first continuous drive means and a second continuous drive means spaced apart in the longitudinal direction from the first continuous drive means; wherein the channel clearing mechanism includes a plurality of clearing elements connected to the first and second continuous drive means, each clearing element including a plurality of tines disposed in an alignment that is normal to the longitudinal direction, each of the tines in each clearing element being disposed to move within a respective one of the continuous channels of the rigid bar screen and configured for removing the contaminants from the respective one of the continuous channels; wherein the channel clearing mechanism includes an upper drive wheel carried by the frame and rotatable about an axis of rotation extending along the longitudinal direction, wherein the upper drive wheel engaging the first continuous drive means and the second continuous drive means to move the first continuous drive means and the second continuous drive means during rotation of the upper drive wheel; wherein the channel clearing mechanism includes a first guide disposed near the transition sections of the plurality of bar members and defining a transition guide path therebetween; and wherein the first continuous drive means is disposed to pass through the transition guide path in the course of clearing the continuous channels between both transition sections and second leg sections of each adjacent pair of the plurality of bar members.

18. A screening device as in claim 17, wherein the channel clearing mechanism includes a central drive wheel disposed near the second leg sections of the plurality of bar members and defining a return guide path therebetween, wherein the central drive wheel is disposed spaced apart from both the first guide and the upper drive wheel in both the vertical direction and the transverse direction, and wherein the first continuous drive means is disposed to pass through the transition guide path and the return guide path in the course of clearing the continuous channels between both transition sections and second leg sections of each adjacent pair of the plurality of bar members.

19. A screening device as in claim 17, wherein the frame carries the rigid bar screen with transition sections of each of the plurality of bar members disposed between the first top and the first bottom of the frame.

20. A screening device as in claim 17, wherein each bar member is configured so that the first leg section elongates at an acute angle with respect to the second leg section.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages of the invention are described in the following exemplary embodiments. Wherein:

(2) FIG. 1 shows a front view of a screening device according to the invention,

(3) FIG. 2 shows a front view of a screening device according to the invention in a sectional view,

(4) FIG. 3 shows a schematic detail section of a side view of a screening device according to the invention in the area of a drive guide, and

(5) FIG. 4 shows a perspective detail section of a screening device according to the invention.

(6) It should be noted at the outset that, in figures which show multiple components or sections of the same kind, only one or two of several components (e.g., clearing elements) or sections of the same kind are provided with a reference sign in some cases, for the sake of clarity.

DETAILED DESCRIPTION

(7) FIGS. 1 and 2 each show a screening device 1 for separating out and removing contaminants 2, in particular, screenings, from wastewater 3. The screening device 1 is integrated into a sewer 4 and comprises a frame 5, via which the screening device 1 is anchored in the sewer 4. As shown in FIGS. 3 and 4, the frame 5 is connected, for example, to a channel bed 6 of the sewer 4 by way of fastening elements (not shown).

(8) The wastewater 3 can flow into the screening device 1 through the inlet opening 7 defined by the frame 5 at the entrance in the front of the screening device 1. The section of the screening device 1 forming the inlet opening 7 is not shown in FIG. 2, in order to be able to show the sections located therebehind (the inlet opening 7 located in front of the sheet plane is represented by a dashed line). Essentially, however, the section is a wall of the frame 5, which extends in parallel to the sheet plane and is sealingly closed off by the channel bed 6 and the lateral walls of the sewer 4, and so wastewater 3 can flow into the screening device 1 only via the inlet opening 7 (see FIG. 1). The longitudinal flow direction X extends in the x-direction into the sheet plane in this case depicted in FIG. 2.

(9) As shown in FIG. 4, the frame 5 comprises a barrier wall 8 on its side positioned opposite the inlet opening 7 in the longitudinal direction.

(10) Two continuous drive means 9 which are mounted one behind the other in the longitudinal x-direction are situated between the inlet opening 7 and the barrier wall 8. The drive means 9 are guided on a closed loop path 13 with the aid of at least one drive wheel 10 in each case connected to each drive means 9. The guidance takes place along a closed loop path 13 in this case in particular with the aid of an upper drive wheel 10, and preferably also with the aid of a central drive wheel 11 and/or a drive guide 12 (cf. FIG. 2 and FIG. 3). Each continuous drive means 9 is designed as a drive chain, a drive belt, or a drive cable in this case. Corresponding to the selection of the drive means 9, the drive wheels 10, 11 are then also designed as a sprocket, a belt pulley, or a cable pulley. As an alternative to FIG. 1, the screening device 1 in FIG. 2 is designed to include two upper drive wheels 11 as well as two central and two lower drive guides 12. As shown in FIGS. 2 and 3, each drive guide 12 is preferably a runner or a rail in each of these cases.

(11) Moreover, the screening device 1 shown comprises a U-shaped or V-shaped sieve grate 14 which is situated at least partially between the two drive means 9. Multiple clearing elements 15 are situated between the drive means 9, with the aid of which the contaminants 2 retained by the sieve grate 14 can be removed from the sieve grate 14.

(12) In the installation position of the screening device 1 represented in FIGS. 1 and 2, i.e., in the installation position in the sewer 4, the wastewater 3 flows through the inlet opening 7, in the longitudinal x-direction, into the frame 5, i.e., the longitudinal flow direction X of the wastewater 3 reaching the screening device 1 extends in the x-direction. Since the wastewater 3, after passing through the inlet opening 7, cannot continue to flow in the original longitudinal flow direction X due to the barrier wall 8, the wastewater 3 forcibly passes, in the y-direction, through the sieve grate 14 including its screen surface 26 extending in the aforementioned longitudinal flow direction X. The wastewater 3 therefore flows through the sieve grate 14 and, finally, out of the screening device 1 and back into the sewer 4, wherein contaminants 2 are retained by the sieve grate 14.

(13) The drive wheels 10, 11 can be directly or indirectly rotated with the aid of a drive (not shown), and so the drive means 9 mounted with the aid of the drive wheels 10, 11 move along the closed loop path 13 along a conveyance direction F. The drive wheels 10, 11 preferably rotate about a rotational axis 16 which extends in the longitudinal flow direction X of the wastewater 3 passing through the screening device 1, which is defined by the longitudinal x-direction in FIG. 1.

(14) The clearing elements 15 are operatively connected to the drive means 9 in such a way that the clearing elements 15 are also moved on the circular path 13. In doing so, the clearing elements 15 pass by the sieve grate 14 and remove the contaminants 2 from the sieve grate 14. The clearing elements 15 are designed, in particular, for transporting the contaminants 2 upward in the direction of a discharge 17. From there, the contaminants 2 are conveyed, for example, into a container 18. In addition, a sheet steel chute 29 is situated between the discharge 17 and an upper end section 27 of the sieve grate. The sheet steel chute 29 extends, as an extension of the sieve grate 14, obliquely upward and is designed to be impermeable to water, and so the wastewater 3 can emerge only in the area of the sewer 4, and not across the width thereof of the chute 29.

(15) FIG. 3 shows a schematic detail section of a side view of the screening device 1 according to the invention in the area of a lower drive guide 12. The drive guide 12 is situated in the frame 5 above the channel bed 6. The clearing elements 15 extend in the longitudinal direction between the two drive means 9 in this case. The clearing elements 15 are connected to the drive means 9, and so the clearing elements 15 move together with the drive means 9 in the conveyance direction F. Each clearing element 15 preferably comprises a clearing bar 19 including cleaning tines 20 situated next to each other.

(16) The clearing elements 15 extend in the longitudinal flow direction X of the wastewater 3 in this case. The sieve grate 14 comprises multiple grating bars 21 which correspond to the cleaning tines 20 in such a way that the cleaning tines 20 engage into the channels 22 that are formed between the adjacent grating bars 21 in order to remove the contaminants 2 (cf. FIG. 1 and FIG. 2).

(17) FIG. 4 shows a perspective detail section of the screening device 1. The clearing elements 15 are not shown here, for the sake of clarity. In addition, the drive means 9 are represented only on the right hand side of FIG. 4. The sieve grate 14 is U-shaped or V-shaped and is situated between the inlet opening 7 and the barrier wall 8. The barrier wall 8 also comprises an emergency overflow 28 through an upper region of the barrier wall 8, and so the wastewater 3 can flow out of the screening device 1 through the emergency overflow 28 once a certain wastewater level has been reached or in the event that the screening device becomes clogged due to a malfunction. The sieve grate 14 comprises a screen trough 23, which is a region of the bar screen 14 that is disposed between a first sieve grate section 24, and a second sieve grate section 25. The two sieve grate sections 24, 25 extend essentially in a straight line upward on both sides, proceeding from the screen trough 23.

(18) As is the case with the two sieve grate sections 24, 25, the screen trough 23 also comprises grating bars 21 situated next to each other. The first sieve grate section 24 extends from the upper end section 27 (cf. FIG. 1) to the screen trough 23. The screen trough 23 is held by the frame 5 so that it becomes situated in the area of the channel bed 6 in this case. The second sieve grate section 24 extends upward from the screen trough 23, in particular beyond the anticipated level of the wastewater 3 (cf. FIG. 1). As is clearly apparent here in the view of FIG. 4, each section of the screen surface 26 formed by the screen trough 23 and the remaining sieve grate sections 24, 25 extends in parallel to the longitudinal flow direction X.

(19) The present invention is not limited to the exemplary embodiments which have been represented and described. Modifications within the scope of the claims are also possible, as is any combination of the features, even if they are represented and described in different exemplary embodiments.

LIST OF REFERENCE SIGNS

(20) 1 screening device

(21) 2 contaminant

(22) 3 wastewater

(23) 4 sewer

(24) 5 frame

(25) 6 channel bed

(26) 7 inlet opening

(27) 8 barrier wall

(28) 9 drive means

(29) 10 upper drive wheel

(30) 11 central drive wheel

(31) 12 drive guide

(32) 13 circular path

(33) 14 sieve grate

(34) 15 clearing element

(35) 16 rotational axis

(36) 17 discharge

(37) 18 container

(38) 19 clearing bar

(39) 20 cleaning tines

(40) 21 grating bar

(41) 22 opening

(42) 23 screen trough

(43) 24 first sieve grate section

(44) 25 second sieve grate section

(45) 26 screen surface

(46) 27 upper end section

(47) 28 emergency overflow

(48) 29 sheet steel chute

(49) F conveyance direction

(50) X flow direction