JPH11293652A - Dust arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust arrester capable of reducing its installation cost in a simple structure and easily doing removing work for dust trapped on a screen. SOLUTION: A dust arrester 1 includes a pair of guide rails 2 in the cross direction opposed to both side walls of an irrigation channel 11 and arranged extending upward and downward, a dust trapping screen 3 guided by a pair of guide rails 2 and held to be moved up and down between upper and lower positions and an up-and-down moving mechanism 4 for moving up and down the screen 3 hung on a wire rope 44. The screen 3 is supported in the condition of being located at the upper position via the guide rails 2, so that its attitude can be changed between vertical attitude along the extending direction of the guide rails 2 and lateral attitude tilting from the vertical attitude.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removing device disposed across a waterway for removing dust mixed in flowing water of the waterway.

[0002]

2. Description of the Related Art Conventionally, there has been known a dust removing device disposed across a water channel to remove dust mixed in a water channel such as a river or a water channel. This dust removing device has a pen-shaped screen in which a plurality of rods extending in the vertical direction are arranged at the same pitch in the width direction, a so-called rake having a claw that scrapes up dust trapped on the screen, and a rake that moves up and down the rake. Lifting means for raising and lowering. And
When a predetermined amount of dust is caught on the screen, the lifting means is driven to raise the rake, and the dust adhered to the screen is scraped by the rake and discharged into a predetermined dust collection hopper provided at the top of the screen. It is supposed to.

According to such a dust removing apparatus, dust caught on the screen is automatically removed by driving the elevating means, which is useful in terms of labor saving.

[0004]

By the way, in the above-mentioned conventional dust removing apparatus, a motor or a winch for winding a rope as a lifting / lowering means, and a pulley structure for stretching a rope are employed. Each of these equipments is expensive, and if an attempt is made to attach a lifting means integrating them to a screen, not only would large investment costs and construction costs be required but also the maintenance cost would be increased due to the complexity of the equipment. However, there is a problem that the bulk increases.

[0005] On the other hand, as for waterways, there are various scales from large rivers to small waterways for agriculture, and the degree of contamination by trash is various. If the above-described dust removing device is employed in a waterway with a low degree of contamination by garbage, there is a problem that an excess facility cannot be obtained and an effect corresponding to the investment amount cannot be obtained.

Therefore, conventionally, only a screen is provided in an irrigation canal with a low degree of contamination without providing an automatic dust removing structure such as a rake or a lifting / lowering means. However, even if the pollution degree is low, after a long period of time, the dust trapped on the screen will accumulate and impede the flow of water. become.

[0007] However, when the screen is not provided with an automatic dust removing structure, a manual operation is required in which an operator enters a water channel, manually removes dust trapped on the screen, and lifts the dust on the water channel. It had to be done, and improvement of this was expected.

SUMMARY OF THE INVENTION The present invention has been made to meet the above-mentioned demands, and has a simple structure so that the equipment cost can be kept low and the work for removing dust trapped on the screen can be easily performed. It is an object of the present invention to provide a dust removing apparatus capable of performing the above-described operations.

[0009]

According to a first aspect of the present invention, there is provided a dust removing apparatus, comprising: a pair of width-wise guide rails disposed on both side walls of a water channel so as to extend up and down so as to face each other; It is configured to include a screen for capturing dust, which is guided by the guide rail so as to be able to ascend and descend between a lower position and an upper position, and an elevating mechanism which elevates and lowers this screen via a suspending member. The guide rail supports the screen so that the screen can be changed between a vertical position along a direction in which the guide rail extends and a horizontal position tilted from the vertical position while the screen is located at the upper position. It is characterized by having.

According to the dust removing apparatus, the screen in the vertical position set at the lower position between the side walls of the water channel is lifted to the upper position by the elevating mechanism while a predetermined amount of dust is captured on the screen. Ascending while being guided by the rails, the posture is changed to the lateral posture when reaching the upper position. Then, an operation of removing dust captured from the screen set in the horizontal posture is performed. The screen from which the dust has been removed is lowered while being guided by the guide rails by the reverse operation of the lifting mechanism, and is set at a lower position between both side walls of the water channel.

As described above, the screen is configured to be able to change its posture between the vertical posture and the horizontal posture while being lifted to the upper position. By setting the posture to the horizontal posture, it becomes possible to easily perform the dust removal work that is difficult if the posture is maintained in the vertical posture.

Therefore, the structure is smaller than that of a conventionally used dust removing device in which dust caught on the screen is scraped up by a rake without being raised and lowered and discharged to the outside at the upper end of the screen. In addition to simplifying the structure, the equipment cost can be reduced, and the use of, for example, a winch that can be manually operated as the elevating mechanism can reduce the energy cost of electric power and the like. However, the simplicity contributes to a reduction in maintenance costs.

According to a second aspect of the present invention, in the dust removing apparatus according to the first aspect, each of the guide rails comprises:
The screen has a guide groove on the opposing surface, the screen has a frame, and a pair of guided protrusions protruding outward in the width direction is provided at a lower portion of the frame, and The guided protrusions are dimensioned so as to be fitted into the corresponding guide grooves in a sliding contact state, and the guide grooves are characterized in that the upper position portion is bent toward the water channel direction. It is.

According to this dust removing device, the screen is lifted by operating the lifting mechanism to lift the upper end of the frame.
The guided protrusion at the bottom of the frame body rises while sliding in the guide groove of the guide rail. When the screen reaches the upper position, the guided projection is guided to the portion of the guide groove extending in the water channel direction, so that the screen is suppressed from being lowered. In this state, by operating the elevating mechanism to lower the upper portion of the frame, the screen in the vertical position is rotated around the guided projection to be in the horizontal position at the upper position. When repositioning the screen in the horizontal position at the upper position to the lower position, the upper end of the frame is temporarily lifted by operating the elevating mechanism to change the position to the vertical position, and then the guided protrusion extends in the channel direction of the guide groove. After moving from the portion to the portion extending in the vertical direction, the frame may be hung by the reverse operation of the elevating mechanism. In this way, the screen is lowered along the guide rail by the guided projection being guided by the guide groove, and is set at a lower position across the water channel.

As described above, the guide groove is provided with a portion extending in the water channel direction at the upper position, and the guided protrusion is provided at the lower portion of the guide frame, thereby simplifying the structure for raising and lowering the screen and the structure for changing the posture. And the operation of raising and lowering the screen and changing the attitude of the screen are facilitated.

According to a third aspect of the present invention, in the dust removing apparatus according to the second aspect, the guide projection is provided outside the guide groove and at the center of the radius of curvature of the bent portion. A fulcrum member for assisting the direction change along the guide groove is provided, and the frame body has an abutment piece for abutting on the fulcrum member near a position where the guided projection is provided. It is characterized by the following.

According to this dust removing device, when the screen rises and the guided projection reaches the bent portion of the guide groove,
The contact protrusion provided on the frame abuts on the fulcrum member, and the guided protrusion passes through the bent portion of the guide groove in a state where the contact protrusion is guided by the fulcrum member. The passage of the portion is facilitated, whereby the operation of changing the attitude of the screen is easily performed.

According to a fourth aspect of the present invention, there is provided the dust removing apparatus according to the third aspect, wherein the fulcrum member is rotatable around a fulcrum axis to adjust the angle, and
It is characterized in that the distal end portion has a press-fitting metal fitting that comes into contact with the contact piece.

According to this dust removing apparatus, the angle of the press fitting with respect to the horizontal plane is appropriately changed between when the screen is raised and when the screen is lowered, so that the guided projection can easily pass through the bent portion of the guide groove. It is easy to change the posture of the screen when the contact piece is in contact with the press fitting.

[0020]

1 to 3 are partially cutaway perspective views showing an embodiment of a dust removing apparatus according to the present invention.
Shows the state where the screen is set to the lower position, and FIG.
FIG. 3 shows a state in which the screen is set to the upper position in the vertical posture.
Shows a state in which the screen has been changed to the horizontal posture at the upper position. In these figures, XX
The direction is referred to as the width direction, and the YY direction is referred to as the front-rear direction.
The direction is the left bank side, + X direction is the right bank side, -Y direction is the upstream side,
The + Y direction is called the downstream side.

As shown in FIGS. 1 to 3, the dust removing device 1
A pair of vertically extending guide rails 2 arranged between the side walls 12 of the irrigation channel 11 so as to face each other;
A screen 3 that is guided by the guide rail 2 and moves up and down between a lower position and an upper position, an elevating mechanism 4 that moves the screen 3 up and down, and moves the screen 3 positioned at the upper position between a vertical position and a horizontal position. And a posture change assist mechanism 5 for changing the posture of the vehicle.

The guide rail 2 is made of a steel material having a U-shape in a sectional view, and has a long flat plate-shaped rail body 21 forming a bottom and a predetermined amount of protrusion on both sides of the rail body 21. A pair of guide walls 22 projecting over the entire length of the rail body 21, and a guide groove 23 for guiding the screen 3 up and down between the pair of guide walls 22.
Are formed.

The pair of guide rails 2 includes an ascending and descending guide portion 2a fixed to each side wall 12 at a steep slope toward the upstream side with the guide grooves 23 opposed to each other, and the ascending and descending guide portions 2a. Posture changing guide portion 2 which is a part of the posture change assisting mechanism 5 and is formed so as to be gently sloped downward from the upper end of the guide portion 2a toward the downstream side.
b and a bent part 2c interposed between the elevating guide part 2a and the posture changing guide part 2b. The bent portion 2c is formed in an arc shape so that the lower wheel main body 35a can pass therethrough. A stopper 24 is provided between the guide walls 22 at the downstream end of the posture changing guide portion 2b.
a is prevented from falling off from the attitude changing guide portion 2b.

The screen 3 has a rectangular frame 31 composed of a vertical frame 31a and a horizontal frame 31b, and is arranged at a constant pitch in the width direction while being bridged between the vertical frames 31a of the frame 31. It comprises a plurality of screen bars 32. The length of the horizontal frame 31b is set to be slightly shorter than the distance between the pair of guide rails 2, so that the frame 3
1 can be sandwiched between the pair of guide rails 2 with a predetermined gap dimension.

The lower horizontal frame 31b is provided with a shelf 31f projecting toward the upstream side.
As a result, the screen bar 32
To prevent the dust 33 from falling down.

On the outer surface of each of the vertical frames 31a, lower wheels (guided projections) 35 rotatably supported about a lower horizontal shaft 34 slightly below the vertical center position in the state of FIG. And a pair of widthwise horizontal brackets 31c protruding toward the upstream side are protrudingly provided at the same upper position, and are rotatable around an upper horizontal shaft 36 bridged between the horizontal brackets 31c. The upper wheel 37 is pivotally supported.

The lower wheel 35 includes a lower wheel body 35a.
And a flange 3 formed inside the lower wheel body 35a
5b. And the lower wheel body 35a
The diameter is set so that the guide rails 2 are fitted into the guide grooves 23 in a state of sliding contact with the inner surfaces of the pair of guide walls 22. Further, the upper wheel 37 includes an upper wheel main body 37a,
When the screen 3 is mounted between the guide rails 2, the outer peripheral surface of the upper wheel main body 37 a abuts the guide wall 22 on the upstream side of the elevating guide 2 a of the guide rail 2. The screen 3 is mounted between the guide rails 2 in a state where the screen 3 is prevented from rotating clockwise around the lower horizontal axis 34, and the elevating guide portion 2a
You are guided up and down.

The elevating mechanism 4 includes a portal structure 41 constructed on the side wall 12 on the downstream side of the guide rail 2, a winch 42 attached to the portal structure 41, and a portal structure 41. It comprises a predetermined number of supported pulleys 43 and a wire rope (suspension member) 44 connecting the winch 42 and the screen 3 via the pulleys 43.

The portal structure 41 includes a pair of columns 41a in the width direction, which are erected on the side wall 12 slightly downstream of the guide portion 2b for changing the attitude of the guide rail 2, and a pair of columns 41.
and a beam material 41b inserted between the members a.

The winch 42 is supported and fixed by a shelf 41c protruding from the downstream surface of the left support 41a. The winch 42 has a drum 42a for winding a wire rope 44, and the drum 42a
A handle 42b for rotating the handle a is protruded toward the downstream side, and the wire rope 44 is wound up or unwound by the drum 42a by rotating the handle 42b forward and backward. .

The pulley 43 includes a first pulley 43a rotatably supported around a horizontal axis extending in the width direction of a predetermined bearing member provided on the lower surface of the beam member 41b, and the first pulley 43.
and a second pulley 43b rotatably supported about a vertical axis by a beam member 41b at the left position on the downstream side of a. The wire rope 44 pulled out from the drum 42 a of the winch 42 hangs in the direction of the guide rail 2 via these pulleys 43. On the other hand, the horizontal frame 31 of the screen 3
b, a pair of vertical brackets 31d project upward from the center of the pair of vertical brackets 31b.
The support rod 31e is bridged between d. The lower end of the wire rope 44 hung from the first pulley 43a is connected to the support rod 31e, so that the guide rail 2 is suspended from the wire rope 44.

Therefore, by turning the handle 42b of the winch 42 in a predetermined direction, the drum 4
The screen 3 in a vertical position as shown in FIG. 1 and positioned at a lower position of the elevating guide 2a by being wound around the screen 2a.
As shown in FIG. 2, the lower wheel main body 35a is set at an upper position where the lower wheel main body 35a is in contact with the guide wall 22 of the bent portion 2c of the guide rail 2, and the handle is raised. By turning 42b in the reverse direction, the screen 3 located at the upper position returns to the lower position.

When the screen 3 is positioned at the upper position in the vertical position, the wire rope 44 is loosened by operating the winch 42 while guiding the lower wheel body 35a to the position changing guide portion 2b of the guide rail 2. The lower wheel main body 35a fits into the guide groove 23 of the attitude changing guide portion 2b which is downwardly tapered from the bent portion 2c toward the downstream side, and rotates clockwise around the lower horizontal shaft 34 at this position. Thus, as shown in FIG. 3, the screen 3 is changed from a vertical posture to a horizontal posture.

On the other hand, on the downstream side of the gate-shaped structure 41, a mesh plate 13 having a large number of through-holes covering the upper opening of the irrigation channel 11 is covered, and a work area is formed by the mesh plate 13. In addition, an opening of the dust chute 14 is provided on a side portion of the one side wall 12. Therefore, in a state where the screen 3 in the vertical position at the lower position is lifted and the posture is changed to the horizontal position (FIG. 3), the worker positioned on the eyeboard 13 removes the dust 33 captured by the screen bar 32. The screen 3 is cleaned by being thrown into the dust chute 14. Further, a bridge plate 15 flush with the eye plate 13 is provided between the gate-shaped structure 41 and the screen 3 so as to close the upper opening of the irrigation channel 11. The bridge plate 15 is made of reinforced concrete integrally with the left and right guide walls 22.

In this embodiment, in order to smoothly change the vertical position of the screen 3 located at the upper position to the horizontal position, and to smoothly return the horizontal position of the screen 3 to the vertical position, the above-mentioned position change assistance is provided. A mechanism 5 is provided.
FIG. 4 is a side view illustrating an embodiment of the posture change assisting mechanism 5. The posture change assist mechanism 5 assists the screen 3 at the upper position to smoothly perform a posture change operation between a vertical posture and a horizontal posture. As shown in FIG. 4, the posture change assisting mechanism 5 includes a fulcrum member 51 installed on the bridge plate 15, a contact protrusion 52 provided on the vertical frame 31 a corresponding to the fulcrum member 51, An operation rod 53 for operating the fulcrum member 51 is provided.

The fulcrum member 51 includes a board 51a, a pair of bearing pieces 51b erected on the board 51a in the width direction, and
The support shaft 51 inserted between the pair of bearing pieces 51b
and a press fitting 51d rotatably supported around the support shaft 51c within a predetermined range and co-rotating with the support shaft 51c around the axis. The press fitting 51d
Has a pressure receiving rod 51e extending outward in the radial direction of the support shaft 51c.
Is slightly downstream of the support shaft 51c on the base end side.
And a second stopper 51g is provided on the upstream side. The press fitting 51d is connected to the first stopper 51f.
An abutting posture in which the abutment abuts on the substrate 51a and rises substantially vertically;
The posture can be changed between the lying posture in which the second stopper 51g comes into contact with the substrate 51a to be in the lying state.

The contact protruding piece 52 has a bulged portion 52a whose central portion in the vertical direction of the downstream edge in FIG. 4 bulges toward the downstream side, and an upper inclined portion is provided above the bulged portion 52a. Face 5
2b and a lower inclined surface 5
2c is formed.

The distance L between the top of the bulging portion 52a of the abutment piece 52 and the axis of the lower wheel 35 is such that the top of the bulging portion 52a contacts the top of the pressure receiving rod 51e in the upright posture. In a state where the lower wheel main body 35a that has risen on the guide rail 2 in the contact state moves from the bent portion 2c of the guide rail 2 to the attitude changing guide portion 2b (that is, the bent portion 2c).
The lower wheel main body 35a is bent at the bent portion of the guide rail 2 in a state in which the top of the bulging portion 52a is in contact with the top of the pressure receiving rod 51e in the reclined position and the top of the pressure receiving rod 51e in the lying position. The dimensions are set so as to be located at the boundary between the lifting guide 2c and the elevating guide 2a.

The operating rod 53 is provided with a handle 5 at the downstream end.
3b, and a sliding rod 53a
and a link rod 53c rotatably supported about the horizontal axis at the upstream end portion of FIG. The sliding rod 5
3a is fitted in a sliding manner in a guide cylinder 54 provided in the lower part of the inner surface of the column 41a of the gate-shaped structure 41 so as to extend in the horizontal direction, whereby the handle 53b is grasped and the front-rear direction (FIG. 4 in the left-right direction).

On the other hand, the support shaft 51c of the fulcrum member 51 has
A rotating rod 51h is fixed to a portion protruding outside from the bearing piece 51b so as to protrude upward. This rotating rod 51
The upper end of the link h and the upstream end of the link rod 53c are relatively rotatably connected about a horizontal axis. Thus, by gripping the handle 53b and pressing the operating rod 53 toward the upstream side, the rotating rod 51h rotates counterclockwise around the support shaft 51c, and the pressure receiving rod 51e is in the reclined posture. The pressure receiving rod 51e is set in the upright posture by the clockwise rotation of the rotating rod 51h around the support shaft 51c by pulling the handle 53b to the downstream side.

According to the posture change assisting mechanism 5, when the screen 3 (FIG. 1) set at the lower position is lifted to the upper position, the operation rod 53 is pulled to the downstream side in advance and the pressure receiving rod 51e is set to the standing posture. By setting the posture, the lower wheel 35 of the screen 3 (FIG. 2), which has been raised while being guided by the elevating guide portion 2a of the guide rail 2 by operating the winch 42, passes through the bent portion 2c of the guide rail 2. At the same time that the top of the bulging portion 52a of the contact protruding piece 52 abuts on the top of the pressure receiving rod 51e in the upright posture. By loosening the rope 44, the lower wheel main body 35a moves to the posture changing guide portion 2b while performing a circular motion with a radius L around the contact point, and further moves the screen. Down 3, the posture change from the vertical orientation to the horizontal orientation is smoothly rotated clockwise 35 about the lower wheel (Figure 3).

Conversely, the screen 3 is set in the horizontal position.
Before hanging the handle to the lower position,
Is operated to move the operation rod 53 toward the upstream side to set the pressure receiving rod 51e to the reclining posture. In this state, the horizontal frame 31b of the screen 3 is temporarily lifted by operating the winch 42. By doing so, the screen 3 is moved to the lower wheel 3
While turning counterclockwise around 5 to take a vertical position,
The lower wheel main body 35a shifts from the attitude changing guide portion 2b of the guide rail 2 to the bent portion 2c, and further hangs on the upper end of the elevating guide portion 2a.
2a abuts on the top of the pressure receiving rod 51e, and is assisted by the guide 2 for raising and lowering from the bent portion 2c of the screen 3.
The transition to “a” is performed smoothly.

In the present embodiment, as described in detail above, the dust removing device 1 includes a pair of widthwise guide rails 2 arranged on both side walls of the water channel 11 so as to extend vertically.
A dust capturing screen 3 guided by the pair of guide rails 2 and held between a lower position and an upper position so as to be able to move up and down;
A vertical mechanism along the direction in which the guide rails 2 extend, and tilting from the vertical attitude in a state where the screen 3 is positioned at an upper position by the guide rails 2. The screen 3 in the vertical position, which is set at a lower position between the two side walls of the irrigation channel 11, is supported in such a manner that the position can be changed between the horizontal position and the vertical position. 4 lifts up while being guided by the guide rail 2 by being lifted to the upper position, and when the upper position is reached, the posture is changed to the horizontal posture, and the dust caught on the screen 3 in the horizontal posture is removed. Removal work can be performed. And screen 3 after removing dust
Can be lowered while being guided by the guide rail 2 by reversely operating the lifting mechanism 4, and can be set at a lower position between both side walls of the irrigation channel 11.

As described above, since the screen 3 is configured so as to be able to change its posture between the vertical posture and the horizontal posture in a state where it is lifted to the upper position, the screen 3 on which dust is captured is moved. By setting the posture to the horizontal position at the upper position, it is possible to easily perform dust removal work that is difficult if the posture is maintained in the vertical position.

As described above, the dust removing apparatus 1 of the present invention has a simple structure as compared with the conventional dust removing apparatus using a rake, so that the equipment cost and the maintenance cost can be reduced correspondingly, and the lifting mechanism can be lowered. By adopting the manually operated winch 42 as 4, it is possible to contribute to reduction of energy costs such as electric power.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above embodiment, the wire rope 44 is used as the hanging member. However, the present invention is not limited to the case where the hanging member is the wire rope 44. Or a chain may be employed.

(2) In the above embodiment, the winch 42 is a manual winch, but an electric winch may be used instead of the manual winch.

(3) In the above embodiment, the wire rope 44 is connected to the center of the upper edge of the frame 31 of the screen 3. A pair of wire ropes 44 may be provided in the width direction.
By doing so, the hanging state of the frame 31 by the wire rope 44 is stabilized, and the screen 3 can be raised and lowered more favorably.

(4) In the above embodiment, the posture change assist mechanism 5 including the fulcrum member 51 and the like is provided to assist the posture change between the vertical posture and the horizontal posture of the screen 3 located at the upper position. However, the present invention is not limited to the provision of the posture change assisting mechanism 5, and can cope with the posture change by increasing the radius of curvature of the bent portion 2c of the guide rail 2 without particularly providing the posture change assist mechanism 5. can do.

[0051]

According to the dust removing device of the first aspect of the present invention, a pair of width-wise guide rails provided in the water channel, and are guided by these guide rails to move up and down between the lower position and the upper position. A dust-removing device including a screen for capturing dust and an elevating mechanism for suspending and elevating the screen, and the guide rail extends along the direction in which the guide rail extends in a state where the screen is located at the upper position. Since the posture can be changed between the vertical posture and the horizontal posture tilted from this vertical posture, the screen where dust is captured is set to the horizontal posture at the upper position, making it difficult to maintain the screen in the vertical posture. It is possible to easily perform the work of removing dust trapped in the vehicle.

Further, the dust removing device is a conventional dust removing device in which the dust caught on the screen is scraped up by a rake without being raised and lowered, and is discharged to the outside at the upper end of the screen. Compared with this, the structure is simplified, and the equipment cost and the maintenance cost can be reduced accordingly. In addition, by adopting, for example, a winch that can be manually operated as the elevating mechanism, it is possible to contribute to reduction of energy costs such as electric power.

According to the dust removing device of the second aspect of the present invention, opposed guide grooves are provided on the opposed surfaces of the respective guide rails, and a frame is provided on the screen, and the frame is provided at the lower portion of the frame in the width direction. A pair of guided projections projecting toward the projection is provided, and each guided projection is dimensioned so as to be fitted into the corresponding guide groove in a sliding contact state, and further, a portion at an upper position of the guide groove The screen is raised by operating the lifting mechanism to lift the upper end of the frame so that the guided projections at the bottom of the frame slide in the guide grooves of the guide rails. Thus, the screen can be brought into a state in which the guided projection is guided to a portion of the guide groove extending in the water channel direction when the screen reaches the upper position, whereby the lowering thereof is suppressed. In this state, by operating the elevating mechanism to lower the upper part of the frame, the screen in the vertical position is rotated around the guided projection, whereby the screen can be set to the horizontal position in the upper position. Conversely, when repositioning the screen in the horizontal position at the upper position to the lower position, the upper end of the frame is temporarily lifted by operating the lifting mechanism to change the position to the vertical position, and then the guided projection is moved to the channel of the guide groove. After moving from the part extending in the direction to the part extending in the vertical direction, if the frame is suspended by the reverse operation of the elevating mechanism, the screen will follow the guide rail by the guided projections being guided in the guide grooves. Descends, which allows the screen to be positioned in a lower position across the channel.

As described above, by providing a portion extending in the water channel direction at the upper position in the guide groove and providing the guided protrusion at the lower portion of the guide frame, the structure for raising and lowering the screen and the structure for changing the posture can be simplified. , And the operation of raising and lowering the screen and changing the attitude can be easily performed.

According to the dust removing device of the third aspect of the present invention, the fulcrum for assisting the direction change of the guided projection along the guide groove on the outside of the guide groove and on the center of the radius of curvature of the bent portion. A member is arranged, and a contact protruding piece that contacts the fulcrum member is provided near the position where the guided projection is provided on the frame, so that the screen rises and the guided projection reaches the bent portion of the guide groove Then, the contact protrusion provided on the frame body contacts the fulcrum member, and the guided protrusion passes through the bent portion of the guide groove in a state where the contact protrusion is guided by the fulcrum member. Of the screen can be easily passed, thereby making it possible to easily perform the operation of changing the attitude of the screen.

According to the dust removing device of the fourth aspect of the present invention, since the fulcrum member is rotatably supported around the fulcrum axis,
By appropriately setting and changing the angle of the press fitting to the horizontal plane at the time of raising and lowering the screen, the guided projection can easily pass through the bent portion of the guide groove, and the contact protrusion comes into contact with the press fitting. It is possible to easily change the posture of the screen in the state.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing one embodiment of a dust removing apparatus according to the present invention, showing a state where a screen is set at a lower position.

FIG. 2 is a partially cutaway perspective view showing an embodiment of the dust removing apparatus according to the present invention, and shows a state in which a screen is set at an upper position in a vertical posture.

FIG. 3 is a partially cutaway perspective view showing one embodiment of the dust removing apparatus according to the present invention, and shows a state in which the screen has been changed to a horizontal posture at an upper position.

FIG. 4 is an explanatory side view showing an embodiment of a posture change assisting mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust removal apparatus 11 Water channel 12 Side wall 13 Sideboard 14 Dust chute 15 Bridge plate 2 Guide rail 2a Elevating guide part 2b Attitude change guide part 2c Bent part 21 Rail body 22 Guide wall 23 Guide groove 3 Screen 31 Frame 31a Vertical frame 31b Horizontal frame 31c Bracket 31d Vertical bracket 31e Support rod 32 Screen bar 33 Dust 34 Lower horizontal shaft 35 Lower wheel 35a Lower wheel main body 35b Flange 36 Upper horizontal shaft 37 Upper wheel 37a Upper wheel main body 37b Flange 4 Lifting mechanism 41 Gate type Structure 41a Column 41b Beam 42 Winch 42a Drum 42b Handle 43 Pulley 43a First pulley 43b Second pulley 44 Wire rope 5 Attitude change assisting mechanism 51 Supporting member 51a Substrate 51b Bearing piece 51c Support shaft 51d Press fitting 5 e pressure receiving rod 51f first stopper 51g second stopper 51h rotation bar 53 the operating rod 53a slide rod 53b grip 53c link rod 52 abuts protrusion

Claims (4)

[Claims] 1. A pair of widthwise guide rails disposed on both side walls of a water channel so as to extend vertically opposite each other, and are guided by the pair of guide rails to move up and down between a lower position and an upper position. A screen for dust capture that is pinched as possible, and a lifting mechanism that lifts and lowers the screen by suspending the screen via a suspension member, and is configured to include the guide rail, wherein the screen is located at an upper position. A dust removing device which is supported so that the posture can be changed between a vertical posture along a direction in which a guide rail extends and a horizontal posture tilted from the vertical posture. 2. Each of the guide rails has a guide groove facing each other on an opposing surface, the screen has a frame, and a pair of projections projecting outward in the width direction are provided at a lower portion of the frame. Guided projections are projected, and each of the guided projections is dimensioned so as to be fitted into the corresponding guide groove in a sliding contact state, and the guide groove has a portion at the upper position facing the water channel direction. The dust removing device according to claim 1, wherein the dust removing device is bent. 3. A fulcrum member for assisting the guide projection to change its direction along the guide groove is provided outside the guide groove and at the center of the curvature radius of the bent portion. The dust removing device according to claim 2, wherein the body has a contact protruding piece that contacts the fulcrum member near the position where the guided protrusion is provided. 4. The fulcrum member is capable of rotating around a fulcrum axis to adjust the angle, and has a pressure fitting which has a tip portion abutting on the abutment piece. The dust removing device according to claim 3, wherein