JPH0971922A - Back rake type auto screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the operation efficiency of an auto screen by laying out an arm rockably in a plurality of locations of main chains extended between a pair of sprockets along the screen and turnably providing a roller on both ends of the arm and fixing a rake with a predetermined spot of the arm. SOLUTION: On the downstream side of a screen 12 in the flowing direction of water, a main chain 24 is stretchingly provided between a first sprocket 15 and a second sprocket 16 along the screen 12. Rakes 20 are provided in a plurality of locations of the main chain 24. When the main chain 24 is adapted to travel, each claw of the rakes 20 is projected from the screen 12 near a floor surface of a water channel 1 and rises along the screen 12, thereby scraping up dregs deposited on the screen 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a back rake type automatic dust remover installed in a water channel of a sewage treatment plant, a waste water treatment plant, a pumping station or the like for removing water residue. It is about.

[0002]

2. Description of the Related Art Conventionally, in a sewage treatment plant, a wastewater treatment plant, a pumping plant, etc., various automatic dust removers are provided to remove residues in water. In the automatic dust remover,
A chain drive type rake is arranged along the screen stretched over the water channel so that the residue on the screen can be scraped up by the rake.

The screen is formed by arranging a plurality of rods in parallel, rises while being inclined from the floor surface of the water channel, and projects and extends above the water surface. in this case,
The screen residue that flows through the water channel by riding on sewage or the like is caught on the screen and is prevented from flowing to the downstream side. In addition, the main chain is arranged along the screen,
Rake is arranged at regular intervals in the main chain. Then, when the main duty chain is run, the residue on the screen is scraped up by the rake, moved along the screen and discharged.

However, since the rake is designed to be moved by sliding on the surface on the upstream side of the screen in the direction of water flow, the rake causes the screen residue to be pressed or pinched by the screen. It will be lost. Therefore, the automatic dust remover is stopped, and the residue falls into the water channel. Therefore, there is provided a back rake type automatic dust remover in which the residue is not pressed or pinched by the screen.

FIG. 2 is a longitudinal sectional view of a conventional back rake type automatic dust remover, FIG. 3 is an enlarged view of a main part of the conventional back rake type automatic dust remover, and FIG. 4 is a rake of the conventional back rake type automatic dust remover. FIG. In this case, a screen 51 is formed by arranging a plurality of rods 50 in parallel, and the screen 51 is inclined and rises in water, protrudes above the water surface, and inclines and extends at the top.

On the downstream side of the screen 51, a main service chain 54 is stretched along the screen 51 between a first sprocket 56 and a second sprocket 58 and driven by a motor (not shown). In addition, the rake bearings 61 are provided at a plurality of set points of the main service chain 54.
Is formed, and the rake shaft 63 is rotatably supported by the rake bearing 61. Then, the rake 55 is formed on the rake shaft 63. The rake 55 includes a plurality of rake claws 5.
5a, each of the rake claws 55a is projected in a comb shape.

A guide roller 77 is attached to the rake 55.
However, a main roller 78 is rotatably arranged on the rake shaft 63, and a support roller 79 is rotatably arranged on a rake cam lever 76 fixed to the rake shaft 63. The guide roller 77 is guided by a guide rail 72 to the main roller 78.
Is guided by the main rail 82, and the support roller 79 is guided by the support rail 71.

The guide rail 72, the main rail 82, and the support rail 71 have two straight line portions extending obliquely along the screen 51, and two half sections connecting between the respective end portions of the straight line portions. It consists of a circular part. Also, support rail 7
The lower semi-circular portion of 1 is located lower than the lower semi-circular portion of the guide rail 72. Therefore, when the main service chain 54 is run, the rake claws 55a of the rake 55 are
Is projected from the screen 51 in the vicinity of the floor surface 14 of the waterway and rises along the screen 51.
Scrape up the residue that has been hung on. Then, the rake 55
The rake claw 55a tilts at the top of the screen 51 on the water surface to drop the residue.

Further, the rake cam lever 76 is swung as the main duty chain 54 travels, and the rake 55 is swung with respect to the main duty chain 54 about the rake shaft 63. In this case, screen 5
Since the rake 55 can be raised while projecting the rake 55 from the downstream side to the upstream side of 1 to start the frying of the residue, the residue will not be pressed or pinched by the screen 51. Absent.

[0010]

However, in the conventional back rake type automatic dust remover, as shown in FIG. 4, the three guide rollers 77, the main roller 78 and the support in which the rakes 55 are three-dimensionally arranged are provided. Since positioning is performed by the rollers 79, interference easily occurs among the guide rollers 77, the main roller 78, and the support roller 79,
A lock or the like may occur when the main duty chain 54 is run. Further, the guide roller 77 and the main roller 78
Since the support rollers 79 are three-dimensionally arranged, the structure is complicated, the manufacturing cost is high, and the maintenance and management are not easy.

The present invention solves the above-mentioned problems of the conventional automatic dust remover so that the residue is not pressed or pinched by the screen, the manufacturing cost is low, and the maintenance and management are easy. An object of the present invention is to provide a back rake type automatic dust remover capable of smoothly operating a rake.

[0012]

Therefore, in the back rake type automatic dust remover of the present invention, the back rake type automatic dust remover is formed by arranging a plurality of steel materials in parallel, rises up in the water with an inclination, and protrudes above the water surface. A screen extending in a reverse direction, a main chain arranged behind the screen along the screen and stretched between a pair of sprockets, and swingably arranged at a plurality of positions of the main chain. Arm, a drive roller rotatably disposed at one end of the arm, a driven roller rotatably disposed at the other end of the arm, and a rake fixed at a setting location in the arm, A roller guide that is formed along the main chain and guides the drive roller and the driven roller.

The width of each region of the roller guide is
It is set corresponding to the posture of the rake. In another back rake type automatic dust remover of the present invention, further, the roller guide extends along the screen and extends along a linear first region for raising the rake, and extends along the screen to remove the rake. A semicircular second area for tilting and tilting backward, a third linear area extending away from the screen for pulling the rake out of the screen and lowering it forward, and a rake horizontally An auxiliary rail for guiding the driving roller and the driven roller is arranged in the roller guide in the third area, the auxiliary rail being provided with a fourth area for holding the rake and a fifth area for inclining the rake downward. A reversing mechanism that reverses the order of the driving roller and the driven roller is configured.

In still another back rake type automatic dust remover of the present invention, an auxiliary arm is further formed in a direction to increase the inclination with respect to the roller guide, and the auxiliary roller is rotatably supported by the auxiliary arm. An auxiliary rail is formed to guide the auxiliary roller. In still another back rake type automatic dust remover of the present invention, there is further provided a posture changing means for changing the rake posture by the relative movement of the main chain and the roller guide.

[0015]

According to the present invention, as described above, in the back rake type automatic dust remover, the back rake type automatic dust remover is formed by arranging a plurality of steel materials in parallel, rises in the water with an inclination, rises above the water surface, and reverses at the top. Extending along with the screen, a main chain that is arranged along the screen behind the screen, and is stretched between a pair of sprockets, and is swingably arranged at a plurality of points of the main chain. An arm, a drive roller rotatably arranged at one end of the arm, a driven roller rotatably arranged at the other end of the arm, a rake fixed at a set position in the arm, and the main task Formed along the chain,
A roller guide for guiding the drive roller and the driven roller.

The width of each area of the roller guide is
It is set corresponding to the posture of the rake. in this case,
When the main service chain travels, the drive roller and the driven roller arranged at both ends of the arm are guided by the roller guide. Since the width of the roller guide is different for each region, the arm tilts due to gravity and changes the rake posture.

In another back rake type automatic dust remover of the present invention, the roller guide further extends along the screen and extends along the screen in a linear first region for raising the rake. A semicircular second area for reversing and tilting the rake backward, a third linear area extending away from the screen for pulling the rake out of the screen and tilting it forward, and a horizontal rake A fourth region for holding the rake in a direction and a fifth region for inclining the rake downward, and in the third region, an auxiliary rail for guiding the drive roller and the driven roller is arranged in the roller guide, and the auxiliary rail is provided. The rail constitutes a reversing mechanism for reversing the order of the driving roller and the driven roller.

In this case, the rake is raised in the first area to scrape up the screen residue on the screen, tilts at the top of the screen above the water surface in the second area, and conveys the screen residue through the chute. Drop it on. After that, the rake is pulled out of the screen in the third area, falls forward while falling, is held horizontally in the fourth area, and is tilted downward in the fifth area.

Since the third region is near the surface of the water flow, the rake can be tilted forward near the surface of the water flow. Therefore, when controlling the posture of the rake, there is no influence of water flow, residue, sedimentation and the like. In still another back rake type automatic dust remover of the present invention, an auxiliary arm is further formed in a direction to increase the inclination with respect to the roller guide, and the auxiliary roller is rotatably supported by the auxiliary arm and An auxiliary rail is formed to guide the rollers.

In this case, when the auxiliary roller is guided by the auxiliary rail, the turning angle of the rake becomes large, so that the turning operation becomes smooth. In still another back rake type automatic dust remover of the present invention, there is further provided a posture changing means for changing the rake posture by the relative movement of the main chain and the roller guide.

In this case, when the main service chain travels and the arm passes in front of the attitude changing means, the attitude changing means changes the inclination of the arm.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a sectional view of a back rake type automatic dust remover in a first embodiment of the present invention, and FIG. 5 is a front view of a back rake type automatic dust remover in a first embodiment of the present invention. In the figure, 11 is a water channel, and 12 is a screen formed by arranging a plurality of flat steel materials 13 in parallel. The screen 12 tilts up in water, rises, projects above the water surface, and tilts and extends at the top.

The screen 12 in the direction of water flow
On the further downstream side, the main chain 24 along the screen 12 has the first sprocket 15 and the second sprocket 1
It is stretched between 6 and 6 and driven by driving a motor 17. Further, the rakes 20 are arranged at a plurality of set points in the main duty chain 24. The rake 2
Reference numeral 0 has a plurality of rake claws 21, and each of the rake claws 21 is formed by protruding in a comb shape. In addition, the above-mentioned main chain 2
4 is a side frame 19 arranged on the left and right of the water channel 11.
A pair is arranged along the.

Therefore, when the main service chain 24 is run, each rake claw 21 of the rake 20 is projected from the screen 11 in the vicinity of the floor surface 14 of the waterway, and the screen 1
Ascend along 1 and scrape up the residue on the screen 11. Then, the screen 11 is turned over at the top of the screen 11 on the water surface, and the residue is dropped onto the conveyor 25 via the chute 23.

Next, the rake 20 will be described.
FIG. 6 is a plan view of a rake according to the first embodiment of the present invention,
FIG. 7 is a front view of the rake according to the first embodiment of the present invention. The service chain 24 is formed by alternately connecting a pair of outer links 31 and a pair of inner links 32. Then, protrusions 34 are formed on the set outer links 31 of the main duty chain 24, and the rake 20 is installed between the protrusions 34 of the pair of left and right main duty chains 24 facing each other. Therefore, the protrusion 3
4 acts as an attachment for the rake 20.

The rake 20 includes a bar 3 extending in the left and right directions.
6, a rake pawl 21 formed in a plurality of comb-shaped projections on the bar 36, and arms 37 fixed to both ends of the bar 36. The drive roller 38 is rotatably supported by the protrusion 34, and the arm 37 is swingably supported. In addition, the arm 37
A driven roller 39 is rotatably supported at the tip of the.

Further, the side frame 19 is provided with a substantially track-shaped roller guide 40 for guiding the driving roller 38 and the driven roller 39. In this case, since the driving roller 38, the driven roller 39, and the roller guide 40 contact each other at one point, the posture of the rake 20 can be changed by changing the width of the roller guide 40 for each region.

Here, the posture of the rake 20 will be described. FIG. 8 is a principle diagram for changing the rake posture in the first embodiment of the present invention, and FIG. 9 is a relationship diagram between the roller guide and the rake posture in the first embodiment of the present invention.
In the rake 20 shown in FIGS. 6 and 7, the drive roller 38
However, since it is attached to the main chain 24 by a pin joint, the roller guide 40 is connected to the drive roller 38.
Is set so as to match the orbit of the main duty chain 24. In this case, in the roller guide 40, the element that controls the drive roller 38 under the control of gravity is the outer peripheral edge 85 of FIG.
And the element that controls the driven roller 39 is the inner peripheral edge 86. Therefore, when the rake 20 moves, the drive roller 38 and the driven roller 39 are moved to the outer peripheral edge 85 and the inner peripheral edge 86.
Will be used as a guide surface for rolling.

Here, the weight of the rake 20 is W and the rake 2 is
The inclination of 0 is θ, the distance between the point A and the center of gravity G of the rake 20 is L _G , the length of the arm 37 is L1, and the driven roller 39 is
When the reaction force of the roller guide 40 with respect to is R, from the balance of the moment around the point A, W · L _G · cos θ = R1 · L1 (1) = R · L1 · sin θ (2) ( Point A shall be fixed by a pin).

As is clear from the equation (2), the rake 20
As the inclination θ becomes smaller, the reaction force R of the roller guide 40 on the driven roller 39 becomes infinite. When rolling the drive roller 38 and the driven roller 39, it is necessary to consider the friction circle and the like. Therefore, when the main duty chain 24 is reversed in the state where the inclination θ is small, the drive roller 38 and the driven roller 39 are May lock.

Therefore, in the actual equipment, when it is necessary to reverse the main chain 24, the attitude of the rake 20 is controlled within the range of the large inclination θ. By the way, the drive roller 38, the driven roller 39, and the roller guide 40 can be considered as a special cam device. In this case, it can be considered that the follower with a roller receives a force in the normal direction from a special cam having a large turning radius and is statically balanced.

According to the cam theory, the angle α formed by the force in the normal direction and the moving direction of the swing arm is called the pressure angle, and in the case of a low speed (100 [rpm]) cam, it is less than about 45 [°]. Then it is said to be safe. The roller guide 40
Extends along the screen 12 as shown in FIG.
First linear area AR for raising the rake 20
1. A semi-circular second area AR2 extending along the screen 12 for inverting the rake 20 and tilting it backward.
A linear third area AR3 for extending away from the screen 12 and pulling the rake 20 out of the screen 12 and lowering it forward, a fourth area AR4 for holding the rake 20 horizontally and lowering it, and a rake 20. Of the fifth area AR5 that tilts downward.

Then, the first area AR1 and the second area AR
2, the width of the roller guide 40 is set to a value capable of accommodating the driving roller 38 and the driven roller 39, and the driving roller 38 and the driven roller 39 are moved together with the service chain 24. Therefore, in the first area AR1, the rake 20 rises along the screen 12 while protruding from the screen 12. At this time, the residue on the screen 12 is scraped up by the rake 20.

Then, in the second area AR2, the rake 20 tilts along the screen 12 and shoots 23.
The residue is dropped onto the conveyor 25 via (FIG. 1).
Further, a reversing mechanism is formed in the third region AR3, the width of the roller guide 40 is widened, the driven roller 39 is separated from the trajectory of the service chain 24, and the rake 20 falls forward by its own weight W. Meanwhile, an auxiliary guide 88 is provided facing the outer peripheral edge 85 of the roller guide 40, and an auxiliary guide 87 is provided facing the inner peripheral edge 86 of the roller guide 40 so that the rake 20 does not fall backward due to the flow of water. To be done. Therefore, the service chain 24 and the drive roller 38 follow the outer route 91 between the outer peripheral edge 85 of the roller guide 40 and the auxiliary guide 88, and the driven roller 39.
Respectively move on the inner route 92 between the inner peripheral edge 86 of the roller guide 40 and the auxiliary guide 87. The outer route 91 and the inner route 92 are the third area AR.
Merging is performed at a point P1 that moves from 3 to the fourth area AR4.
Therefore, the drive roller 38 is moved ahead of the driven roller 39 in the first area AR1 and the second area AR2, while the drive roller 38 is pulled out by the driven roller 39 in the third area AR3.

In this case, since the third region AR3 is above the surface of the water flow, the rake 20 can be tilted forward above the surface of the water flow. Therefore, when controlling the posture of the rake 20,
It will not be affected by sedimentation. Then, in the fourth region AR4, the width of the roller guide 40 is set to a value capable of accommodating the driving roller 38 and the driven roller 39, and the driving roller 38 and the driven roller 39 are moved together with the main chain 24. Therefore, in the fourth area AR4, the rake 20 is maintained at the same angle as the first area AR1 and is held in the horizontal direction. Further, the driven roller 39 is moved ahead of the drive roller 38.

Further, in the fifth area AR5, the outer peripheral edge 85 of the roller guide 40 is absent, and the driven roller 39 is released from the roller guide 40 by the weight W of the rake 20. Therefore, in the fifth area AR5, the drive roller 38 is moved ahead of the driven roller 39 again. In the figure, the thick line of the roller guide 40 indicates
The dominant portion for controlling the attitude of the rake 20 is shown.

As described above, when the main service chain 24 travels, the driving roller 38 and the driven roller 39 arranged at both ends of the arm 37 are guided by the roller guides 40, the arm 37 tilts, and the rake 20 is moved. Change.
Therefore, since the posture of the rake 20 is controlled only by forming one roller guide 40 along the main service chain 24, the roller guide 40 is less likely to be blocked by dirt, sediment, etc., and the rake 20 can be smoothly run. be able to.
Moreover, since the arm 37 can be swung by the weight W of the rake 20, it is possible to obtain a back rake type automatic dust remover which is easy to operate and highly efficient.

Next, a second embodiment of the present invention will be described. FIG. 10 is a front view of a rake in the second embodiment of the present invention, and FIG. 11 is a relationship diagram between a roller guide and a rake posture in the second embodiment of the present invention. In this case, the outer links 31 at a plurality of positions set in the main duty chain 24
A protrusion 34 is formed on the rake 20, and the rake 20 is installed between the protrusions 34 of the pair of left and right service chains 24 facing each other. Therefore, the protrusion 34 acts as an attachment of the rake 20.

The rake 20 includes a bar 36 extending left and right,
The bar 36 includes rake pawls 21 formed at a plurality of portions so as to project in a comb shape, and arms 137 fixed to both ends of the bar 36. The arm 137 is swingably supported by the protrusion 34, and the drive roller 38 and the driven roller 39 are rotatably supported at both ends of the arm 137.

Further, as shown in FIG. 11, the roller guide 40 extends along the screen 12 and extends along the first linear area AR1 for raising the rake 20 and the screen 12 to extend the rake 20. The second area AR2 having a semicircular shape for reversing and tilting backward, the screen 1
A linear third area AR3 for extending the rake 20 out of the screen 12 and lowering it while lowering the rake 20, a fourth area AR4 for holding the rake 20 horizontally and lowering it, and a rake 20. It is composed of a fifth area AR5 tilted downward.

Then, the first area AR1 and the second area AR
2, the width of the roller guide 40 is set to a value capable of accommodating the driving roller 38 and the driven roller 39, and the driving roller 38 and the driven roller 39 are moved together with the service chain 24. Therefore, in the first area AR1, the rake 20 rises along the screen 12 while protruding from the screen 12. At this time, the residue on the screen 12 is scraped up by the rake 20.

In the second area AR2, the rake 2
0 reverses along the screen 12 and drops the residue on the conveyor 25 through the chute 23 (FIG. 1). Further, in the third region AR3, the width of the roller guide 40 is widened, the drive roller 38 and the driven roller 39 are separated from the service chain 24, and the rake 20 falls forward by its own weight W.

In the fourth area AR4, the width of the roller guide 40 is set to a value capable of accommodating the driving roller 38 and the driven roller 39, and the driving roller 38
And the driven roller 39 is moved together with the service chain 24. Therefore, in the fourth area AR4, the rake 2
0 is maintained at the same angle as the first area AR1 and is held in the horizontal direction. Further, the driven roller 39 is moved ahead of the drive roller 38.

Further, in the fifth area AR5, the width of the roller guide 40 is widened, so that the drive roller 38 is
The driven roller 39 is separated from the main chain 24, and the rake 20 falls forward due to its own weight W. In the figure, the thick line of the roller guide 40 indicates the dominant portion for controlling the posture of the rake 20.

By the way, in the first and second embodiments,
Since the reversing mechanism located above the back rake type automatic dust remover is a non-reciprocal mechanism, the main chain 24 cannot be reversed. In an actual back rake type automatic dust remover, coarse dust and the like are caught in the main chain 24,
It may interfere with the rake 20 and lock the competent chain 24. In that case, it is necessary to reverse the main duty chain 24 to release the lock. Therefore, in the reversing mechanism, it is desirable to make the service chain 24 a reversible structure.

Therefore, a third embodiment of the present invention will be described. FIG. 12 is an enlarged view of a part of the reversing part of the roller guide in the third embodiment of the present invention. In the figure, 29
1 is an outer route of the roller guide 40, and 292 is an inner route of the roller guide 40. A shaft 293 is provided at a point where the outer route 291 and the inner route 292 meet, and a switching plate 294, a switching cam 295, and a weight 296 are swingably disposed on the shaft 293.

Normally, the driven roller 39 is the driving roller 38.
Since it precedes, the driven roller 39 pushes the switching plate 294 away by the weight W (FIG. 8) of the rake 20 (FIG. 11) and pushes down the switching plate 294. On the other hand, when the drive roller 38 enters the outer route 291 when the main duty chain 24 travels in the opposite direction, the switching cam 295 causes the drive roller 38 to move.
The switch plate 294 is rotated counterclockwise in the figure against the biasing force of the weight 296.

By the way, as described above, when the inclination θ of the rake 20 in the equation (2) becomes small, it becomes difficult to control the attitude of the rake 20. Therefore, a fourth embodiment in which the inclination θ of the rake 20 is increased by adding another roller having a different phase will be described. FIG.
Is an enlarged view of a rake assembly in the fourth embodiment of the present invention, and FIG. 14 is a schematic view of a roller guide in the fourth embodiment of the present invention.

In the figure, 20 is a rake, 38 is a driving roller, 39 is a driven roller, 139 is an auxiliary roller, and 140 is a roller.
Is an auxiliary arm that supports the auxiliary roller 139, and 237 is an arm. In this case, since the inclination θ of the auxiliary arm 140 can be increased, it becomes easy to control the posture of the rake 20.

As can be seen from FIG. 14, the inner route 92 intersects with the auxiliary rail 392 for guiding the auxiliary roller 139. Therefore, the inner route 92 and the auxiliary rail 392 do not interfere with each other,
Formed on different planes. Next, a fifth embodiment of the present invention will be described. FIG. 15 is a diagram showing a rake attitude control device according to a fifth embodiment of the present invention.

In the figure, 38 is a driving roller, 39 is a driven roller, 335 is a rack as a posture changing means, 33
7 is an arm, 391 is an outer route, and 393 is an inner route. The rack 335 is disposed slightly in front of the point where the outer route 391 and the inner route 393 meet, and meshes with the teeth 339 formed at the rear end of the arm 337 when the drive roller 38 passes. Then, the arms 337 are rotated in the direction of arrow D.

When the rack 335 and the teeth 339 do not mesh with each other after the drive roller 38 has passed, the rotation of the arm 337 is stopped and the arm 337 is kept in the same posture. Therefore, after the residue is discharged, the rake 20 (FIG. 13) is placed on the screen 12 (FIG. 1).
It can be pulled out from 1) and tilted forward. In this case, the engagement between the rack 335 and the teeth 339 causes the arm 33 to move.
7 is rotated, the inclination θ of the rake 20 (see FIG.
Setting of 4) becomes easy.

Both the embodiments of the reversing mechanism shown in FIGS. 14 and 15 are reversible, and when the main duty chain 24 is reversed, the operation reverse to that described above is performed. It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made based on the spirit of the present invention, and they are not excluded from the scope of the present invention.

[0054]

As described above in detail, according to the present invention, in the back rake type automatic dust remover, the back rake type automatic dust remover is formed by arranging a plurality of steel materials in parallel and rises in the water while inclining and rising. A screen projecting upward and extending in an inverted manner at the top, a main chain disposed behind the screen along the screen and stretched between a pair of sprockets, and swinging at a plurality of points on the main chain. A freely arranged arm, a drive roller rotatably arranged at one end of the arm, a driven roller rotatably arranged at the other end of the arm, and a fixed roller fixed at a set position in the arm. And a roller guide that is formed along the main chain and guides the drive roller and the driven roller.

The width of each area of the roller guide is
It is set corresponding to the posture of the rake. in this case,
When the main service chain travels, the driving roller and the driven roller arranged at both ends of the arm are guided by the roller guides, the arm swings, and the rake posture is changed.

Therefore, the posture of the rake can be controlled only by forming one roller guide along the main chain, so that the structure can be simplified and the rake can be smoothly run. You can Moreover, since the arm can be swung by the rake's own weight, an unreasonable force does not act on the main chain. Therefore, the operation efficiency of the back rake type automatic dust remover can be increased.

In another back rake type automatic dust remover of the present invention, further, the roller guide extends along the screen and extends along the screen in a linear first region for raising the rake. A semicircular second area for reversing and tilting the rake backward, a third linear area extending away from the screen for pulling the rake out of the screen and tilting it forward, and a horizontal rake A fourth region for holding the rake in a direction and a fifth region for inclining the rake downward, and in the third region, an auxiliary rail for guiding the drive roller and the driven roller is arranged in the roller guide, and the auxiliary rail is provided. The rail constitutes a reversing mechanism for reversing the order of the driving roller and the driven roller.

In this case, since the third region is above the surface of the water flow, the rake can be tilted forward above the surface of the water flow. Therefore, when controlling the posture of the rake, there is no influence of water flow, residue, sedimentation and the like. As a result, unreasonable force does not act on the competence chain depending on the surrounding conditions. Further, since the rake posture is controlled by the two rollers, it is possible to prevent the interference due to the rollers. Further, since the rollers are arranged in a plane, the structure is simple, the manufacturing cost can be reduced, and the maintenance and management are easy.

In still another back rake type automatic dust remover of the present invention, an auxiliary arm is further formed in a direction to increase the inclination with respect to the roller guide, and the auxiliary roller is rotatably supported by the auxiliary arm. An auxiliary rail for guiding the auxiliary roller is formed. In this case, when the auxiliary roller is guided by the auxiliary rail, the inclination of the auxiliary arm with respect to the roller guide becomes large. Therefore, it becomes easy to control the rake posture.

In still another back rake type automatic dust remover of the present invention, there is further provided a posture changing means for changing the rake posture by the relative movement of the main chain and the roller guide. In this case, when the main duty chain travels and the arm passes in front of the posture changing means, the inclination of the arm is changed by the posture changing means. in this case,
The inclination of the arm can be set easily. In addition, the traveling direction of the competent chain can be easily reversed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a back rake type automatic dust remover according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional back rake type automatic dust remover.

FIG. 3 is an enlarged view of a main part of a conventional back rake type automatic dust remover.

FIG. 4 is an enlarged view of a rake of a conventional back rake type automatic dust remover.

FIG. 5 is a front view of the back rake type automatic dust remover according to the first embodiment of the present invention.

FIG. 6 is a plan view of a rake according to the first embodiment of the present invention.

FIG. 7 is a front view of the rake according to the first embodiment of the present invention.

FIG. 8 is a principle diagram for changing the posture of the rake in the first embodiment of the present invention.

FIG. 9 is a relationship diagram between a roller guide and a rake posture in the first embodiment of the present invention.

FIG. 10 is a front view of the rake according to the second embodiment of the present invention.

FIG. 11 is a diagram showing the relationship between the roller guide and the rake posture in the second embodiment of the present invention.

FIG. 12 is an enlarged view of a part of the reversing portion of the roller guide according to the third embodiment of the present invention.

FIG. 13 is an enlarged view of the rake assembly according to the fourth embodiment of the present invention.

FIG. 14 is a schematic view of a roller guide according to a fourth embodiment of the present invention.

FIG. 15 is a diagram showing a rake attitude control device according to a fifth embodiment of the present invention.

[Explanation of symbols]

 12 screen 13 flat steel material 15 1st sprocket 16 2nd sprocket 20 rake 24 competent chain 37, 137, 237, 337 arm 38 drive roller 39 driven roller 40 roller guide 91, 291, 391 outer route 92, 292, 393 inner route 139 Auxiliary roller 140 Auxiliary arm 392 Auxiliary rail 335 Rack 339 Teeth θ Inclination AR1 First area AR2 Second area AR3 Third area AR4 Fourth area AR5 Fifth area

Claims (4)

[Claims] 1. (a) It is formed by arranging a plurality of steel materials in parallel and rises in water with an inclination,
A screen protruding above the water surface and inverting and extending at the top,
(B) A main chain disposed behind the screen along the screen and stretched between a pair of sprockets, and (c) an arm swingably arranged at a plurality of positions on the main chain. , (D) a driving roller rotatably arranged at one end of the arm, (e) a driven roller rotatably arranged at the other end of the arm, and (f) fixed at a set position on the arm. And (g) a roller guide that is formed along the main service chain and that guides the drive roller and the driven roller, and (h) the width of each region of the roller guide is the posture of the rake. Back rake type automatic dust remover characterized by being set according to. 2. The roller guide extends along the screen and has a linear first region for raising the rake, extends along the screen, and is a semicircle for tilting and tilting the rake backward. A second region of a shape, a linear third region extending away from the screen for pulling the rake out of the screen and tilting it forward while lowering it, a fourth region for holding the rake horizontally, and a rake downwards. In the third area, an auxiliary rail for guiding the driving roller and the driven roller is disposed in the roller guide, and the auxiliary rail reverses the order of the driving roller and the driven roller. The back rake type automatic dust remover according to claim 1, wherein a reversing mechanism is configured. 3. An auxiliary arm is formed in a direction of increasing the inclination with respect to the roller guide, the auxiliary roller is rotatably supported by the auxiliary arm, and an auxiliary rail for guiding the auxiliary roller is formed. The back rake type automatic dust remover described in 1. 4. The back rake type automatic dust remover according to claim 1, further comprising posture changing means for changing the posture of the rake by the relative movement of the main service chain and the roller guide.