JP6574619B2 - Sludge scraping machine - Google Patents

Description

  The present invention relates to a sludge scraper equipped with an endless chain used in a sedimentation basin provided in a sewage treatment facility or a water treatment facility, and in particular, a phenomenon in which the water surface of the sedimentation basin undulates (hereinafter referred to as sloshing) when an earthquake occurs. And a sludge scraping machine capable of preventing the endless chain from being removed from the sprocket wheel.

In the treatment of sewage or clean water, a sludge scraper is installed in the sedimentation basin in order to remove impurities such as inorganic substances such as sand and organic matter contained in the raw water introduced into the sedimentation basin. In this sludge scraping machine, Patent Document 1 has been proposed as preventing the endless chain from being removed from the sprocket wheel by sloshing.
In Patent Document 1, a projecting portion that projects in the pond width direction of the sedimentation basin is provided on the connecting pin of the endless chain, and an upper regulating portion that is disposed above the projecting portion with a space therebetween, A guide member formed by a pond width direction restricting portion that is connected to an end portion of the direction restricting portion opposite to the protruding portion and extends downward from the upper restricting portion; and A device that prevents the endless chain from being removed by cooperation with the protrusion is described. Moreover, in patent document 1, it replaces with the protrusion part extended in the pond width direction provided in the connection pin, and is the side surface of a link member, and the pond width direction of planar view substantially trapezoid shape between two connection pins The structure which provides the wing | blade part extended in is disclosed. When the upper surface of the wing part and the upper direction restricting part are in contact with each other, the upward movement of the endless chain is suppressed, and the tip part of the wing width direction of the wing part is in contact with the pond width direction restricting part. Thus, the movement of the endless chain in the pond width direction is suppressed.

JP 2013-651 A

However, in patent document 1, the protrusion part which opposes the upper direction control part which comprises a guide member is made to protrude so that a connection pin may be extended in a pond width direction, and an upper direction control part is a connection of an endless chain. It must be placed above the pin. Moreover, the wing | blade part provided instead of the said protrusion part is distribute | arranged above the center of a connection pin by the side surface of a link member. Accordingly, in this case as well, the upper restricting portion must be disposed at least above the center of the connecting pin, and a predetermined interval must be ensured between the upper restricting portion and the protruding portion or the wing portion. For this reason, the gap between the upward restricting portion constituting the guide member and the bottom surface of the flight is narrowed, and high dimensional accuracy is required for the installation position of the guide member, which may cause difficulty in the guide member installation work. is there.
Further, the installation dimensional accuracy of the guide member depends on the skill level of the worker. For this reason, if the required dimensional accuracy is not satisfied, the flight bottom surface and the upward restricting portion constituting the guide member may come into contact with each other, and the flight may be damaged.
SUMMARY OF THE INVENTION The present invention provides a sludge scraper that can prevent the endless chain from being removed from the sprocket wheel due to sloshing and can facilitate the work of installing the guide member.

In order to solve the above-mentioned problems, the sludge scraper according to the present invention is a sludge scraper that orbits and drives a two-endless endless chain to which a plurality of flights are attached by a driving device installed on the upper part of the settling basin. An upper guide rail that supports the vicinity of the end of the flight traveling on the water surface track from below, and one end is fixed to the side wall of the settling basin, and the other end extends to the center side of the settling basin, A plurality of first brackets for supporting the upper guide rail from below, and the two endless chains are formed by fastening a plurality of link members by connecting pins, and are below the connecting pins of the link members, A plate projecting toward the side wall of the settling basin in the pond width direction is provided on a side surface of the link member at a predetermined interval along the longitudinal direction of the endless chain, and the pond width direction is provided on the side wall side of the settling basin. A guide member extending toward the center of the settling basin, the guide member being located above the plate and below the bottom surface of the flight, and overlapping the plate at a predetermined interval; A second guide member that is erected upward, and a first guide member that extends from the upper end of the second guide member to the center side of the settling basin in the pond width direction. The second guide member and the tip of the plate in the pond width direction are arranged at a predetermined interval in the pond width direction, are arranged near the water surface trajectory, and the driving shaft to which the rotational force of the driving device is transmitted. Drive sprocket wheels provided on both end sides, and the vertical distance between the first guide member and the plate is in the range of 3/5 to 4/5 times the tooth height of the drive sprocket wheel. It is characterized by being set .

  According to the present invention, it is possible to provide a sludge scraper that can prevent the endless chain from being removed from the sprocket wheel due to sloshing and can facilitate the guide member installation work.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a perspective view which shows the structure of the sludge scraping machine of Example 1 which concerns on one Example of this invention. It is a whole schematic block diagram of the sludge scraper arranged in a sedimentation basin. It is the elements on larger scale near the sedimentation basin side wall of the sludge scraper shown in FIG. It is a side view of the drive sprocket wheel around which the endless chain was wound. It is a figure which shows the positional relationship of the plate-type attachment attached to the guide member and the link member. It is a figure which shows the state in which the flight was attached to the endless chain via the flight attachment. It is a figure which shows the arrangement | positioning relationship with the top view and side view of an endless chain to which the plate type attachment was attached, and a guide member. It is a figure which shows the arrangement | positioning relationship with the top view and side view of an endless chain with which the plate type attachment used for the sludge scraping machine of Example 2 which concerns on the other Example of this invention was attached, and a guide member.

  In the present specification, a mechanism for preventing the endless chain from being removed from the sprocket wheel, which is attached to a link member which is a chain segment constituting the endless chain, is referred to as a “plate attachment”. A mechanism that is provided on the side wall of the settling basin and cooperates with the plate-type attachment to prevent the endless chain from being removed from the sprocket wheel is referred to as a “guide member”. These plate-type attachments and guide members are not limited to their names, and will be described below. Any name may be used as long as they cooperate to achieve the endless chain drop-off prevention function. It is contained in the plate type attachment and guide member of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 2 shows an overall schematic configuration diagram of a sludge scraper disposed in a sedimentation basin. As shown in FIG. 2, the sedimentation basin 8 provided in the water treatment facility or the sewage treatment facility is provided on the downstream side along the flow of the water to be treated, the sedimentation basin upstream wall 8a on the side into which the water to be treated flows. It has a sedimentation basin downstream wall 8b, a pair of sedimentation basin side walls 8c, and a bottom surface of the sedimentation basin. The sludge scraper 1 disposed in the sedimentation basin 8 is rotationally driven by a plurality of flights 3 attached to the endless chain 2 at predetermined intervals and a drive device 5 installed on the water surface of the sedimentation basin 8. Drive sprocket wheel 4a, driven sprocket wheel 4b disposed on the downstream side of drive sprocket wheel 4a and provided near the water surface, driven sprocket wheel 4c provided on the downstream side of driven sprocket wheel 4b and near the bottom surface of sedimentation basin 8 And a driven sprocket wheel 4d provided near the bottom surface of the settling basin 8 and upstream of the driven sprocket wheel 4c. An endless chain 2 to which a plurality of flights 3 are attached at a predetermined interval is stretched in parallel with the drive sprocket wheel 4 a and the driven sprocket wheels 4 b to 4 d and is driven by a drive device 5 to circulate. The flight 3 has a flat plate shape that is attached at a predetermined interval so as to cross the endless chain 2 stretched in parallel with the two strips.

  When the endless chain 2 moves along the direction indicated by the arrow F1 (the direction from the downstream side to the upstream side), the flight 3 attached to the endless chain 2 settles on the bottom surface of the sedimentation basin 8 by gravity settling. The sludge to be raked up to the sludge pit P1 side. Further, when the endless chain 2 moves in the direction indicated by the arrow F2 in the vicinity of the water surface of the settling basin 8 (the direction from the upstream side to the downstream side), the flight 3 attached to the endless chain 2 is scum that floats on the water surface. Is scraped to the scum clearance 6 and discharged. An overflow trough 7 is provided near the water surface and downstream of the scum skimmer 6. The flight 3 that has passed through the driven sprocket wheel 4b descends in the sedimentation basin 8 along with the movement of the endless chain 2 to the driven sprocket wheel 4c disposed near the bottom surface of the sedimentation basin 8, so that the flight 3 contacts the scum skimmer 6. There is no. Hereinafter, the trajectory of the flight 3 moving between the driving sprocket wheel 4a and the driven sprocket wheel 4b is referred to as a water surface trajectory.

  For example, a stainless steel or synthetic resin chain is used as the endless chain 2. Here, the notch chain is formed with a recess below the side of the chain, and the recess, the drive sprocket wheel 4a and a connecting pin (not shown) mesh with each other and slide on the driven sprocket wheels 4b to 4d. The notch chain moves on the orbit. The flight 3 is made of stainless steel, synthetic wood, aluminum or synthetic resin for weight reduction.

  FIG. 1 is a perspective view showing the structure of a sludge scraper according to a first embodiment of the present invention. As shown in FIG. 1, the drive sprocket wheel 4 a constituting the sludge scraper 1 is provided at both ends of the drive shaft 11 to which the rotational force is transmitted by the drive device 5. The driven sprocket wheel 4b is provided at both ends of the intermediate shaft 12, the driven sprocket wheel 4c is provided at both ends of the tail shaft 13, and the driven sprocket wheel 4d is provided at both ends of the head shaft 14. The sludge scraper 1 is provided at both ends of the upper guide rail 9a and the intermediate shaft 12 that support and guide both ends of the flight 3 traveling on the water surface track from below, and at both ends of the driven sprocket wheel 4b and the tail shaft 13. An intermediate guide rail 9b that supports and guides both ends of the flight 3 that moves together with the endless chain 2 between the driven sprocket wheel 4c and the lower end of the head shaft 14 that is folded back by the driven sprocket wheel 4c. And a bottom guide rail 9c for supporting and guiding the flight 3 that moves together with the endless chain 2 from below to the driven sprocket wheel 4d. Moreover, the sludge scraper 1 has a bracket 10a that is fixed at one end to a pair of sedimentation basin side walls and supports the upper guide rail 9a from below at the other end, and the bracket 10a is along a water surface track. A plurality are provided at predetermined intervals. Furthermore, the sludge scraper 1 has a bracket 10b that is fixed at one end to a pair of sedimentation basin side walls and supports the intermediate guide rail 9b from below at the other end, and a plurality of brackets 10b are provided at predetermined intervals. And is arranged so as to approach the bottom surface of the settling basin 8 as it goes to the tail shaft 13 side. Further, the interval between the two bottom guide rails 9c arranged in parallel to the bottom surface of the settling basin 8 in the pond width direction is the above-described two upper guide rails 9a and intermediate guide rails arranged in parallel to each other. It is smaller than the interval in the pond width direction of 9b.

  FIG. 3 is a partially enlarged view of the water surface track portion in the vicinity of one sedimentation basin side wall 8c. As shown in FIG. 3, the flight 3 is connected to the endless chain 2 by a flight attachment 23 and a connecting pin 22 which will be described in detail later. The bracket 10a having one end fixed to the settling basin side wall 8c and the other end protruding toward the center of the settling basin 8 has a substantially L-shaped longitudinal section. An upper guide rail 9a is placed on the upper surface of the bracket 10a near the tip in the pond width direction. That is, the bracket 10a supports the upper guide rail 9a from below. The flight 3 that slides and travels on the upper guide rail 9a includes a first flight shoe 18 at a position in contact with the upper guide rail 9a. Further, in the horizontal direction, that is, in the pond width direction, the flight attachment 23 is sandwiched, and the second flight shoe 19 is provided on the side opposite to the first flight shoe 18 and on the upper surface side of the flight 3. That is, the second flight shoe 19 is located closer to the center of the sedimentation basin 8 than the first flight shoe 18 in the pond width direction. Hereinafter, in this specification, the bottom surface of the flight 3 is the end surface of the end surface of the flight 3 on the endless chain 2 side, and the top surface of the flight 3 is the end surface of the flight 3 opposite to the endless chain 2. It is an end face.

  When the flight 3 travels on the upper guide rail 9a, the first flight shoe 18 comes into contact with the upper guide rail 9a and wears by sliding. Thereby, it can prevent that the flight 3 main body wears out by contacting the upper guide rail 9a directly. As shown in FIG. 3, the first flight shoe 18 protrudes downward by a height T from the bottom surface of the flight 3. The protruding height T of the first flight shoe 18 functions as a wear allowance for the first flight shoe 18. Although not clearly shown in FIG. 3, the second flight shoe 19 also protrudes by a height T above the upper surface of the flight 3, similarly to the first flight shoe 18. Further, both the first flight shoe 18 and the second flight shoe 19 have a width of W2 in the pond width direction (longitudinal direction of the flight 3). As shown in FIG. 1, the flight 3 travels on the water surface track, travels on the intermediate guide rail 9 b, and is turned back by the driven sprocket wheel 4 c provided on the tail shaft 13. During this time, the first flight shoe 18 contacts and slides against the intermediate guide rail 9b. The flight 3 after being turned back by the driven sprocket wheel 4c travels on the bottom guide rail 9c to the head shaft 14 side, that is, the sludge pit P1 side in the direction indicated by the arrow F1, and the bottom surface of the sedimentation basin 8 is caused by gravity settling. The sludge that settles on is raked into the sludge pit P1. During this time, the second flight shoe 19 abuts on the bottom guide rail 9c and slides. Corresponding to the interval in the pond width direction of the two bottom guide rails 9c is smaller than the interval in the pond width direction of the two upper guide rails 9a and the intermediate guide rail 9b, as shown in FIG. The second flight shoe 19 is provided on the inner side along the pond width direction with the flight attachment 23 interposed therebetween than the first flight shoe 18.

A second guide member 16 erected on the bottom side of the flight 3 at the tip of the bracket 10a in the pond width direction, that is, the tip opposite to the end fixed to the sedimentation basin side wall 8c; (2) A guide member constituted by a first guide member 15 that protrudes or extends from the upper end (tip portion on the flight 3 side) of the guide member 16 toward the center portion of the settling basin 8 in the pond width direction (horizontal direction). Prepare. In FIG. 3, the depth direction of the guide member constituted by the first guide member 15 and the second guide member 16, that is, the length parallel to the sedimentation basin side wall 8c will be described later. As shown in FIG. 3, the guide member has a substantially L shape with a transverse section inverted up and down.
On the other hand, among the link members which are a plurality of chain segments constituting the endless chain 2 which will be described in detail later, the link member is below the connecting pin 22 for connecting the link member to the link member on the sedimentation basin side wall 8c side. A plate-type attachment 17 projecting or extending toward the sedimentation basin side wall 8c in the pond width direction (direction parallel to the longitudinal direction of the flight 3).
As shown in FIG. 3, the first guide member 15 and the plate type attachment 17 constituting the guide member have an interval L1 in the vertical direction and an overlapping width W0 in the pond width direction (direction parallel to the longitudinal direction of the flight 3). Have. Further, the tip of the plate-type attachment 17 in the pond width direction and on the settling basin side wall 8c side (the tip facing the second guide member 16 when the flight 3 travels on the water surface track) constitutes a guide member. The second guide member 16 has a gap G2 in the pond width direction. On the other hand, the tip of the first guide member 15 in the pond width direction and the center of the settling basin 8 (the tip facing the link member when the flight 3 travels on the water surface track), and the settling basin of the link member The side surface on the side wall 8c side has a gap G2. FIG. 3 shows an example in which the distal end portion of the first guide member 15 is positioned on an extension line of the central axis of the connecting pin 22 that fastens the opposing link member. When the distance between the side surface of the link member provided with the plate-type attachment 17 and the second guide member 16 is G1, the following relationship is satisfied.
G1 = W0 + 2 × G2
Further, the bottom surface of the flight 3 and the first guide member 15 are separated from each other with a gap G3 in the vertical direction, and the first guide member 15 and the plate-type attachment 17 have a gap L1 in the vertical direction as described above. Therefore, when the flight 3 normally travels on the water surface track, the first guide member 15 and the plate attachment 17 do not contact or interfere with each other. Further, the first guide member 15 and the flight 3 do not contact or interfere with each other.

In the state shown in FIG. 3, even if the endless chain 2 is lifted upward by water surface swinging due to sloshing, the plate-type attachment 17 abuts on the first guide member 15, and further upwards Lifting is suppressed (regulated). This prevents the endless chain 2 from being removed from the drive sprocket wheel 4a in the water surface track.
Even if the endless chain 2 moves to the settling basin side wall 8c side due to the water surface swinging due to sloshing, the tip of the plate type attachment 17 on the settling basin side wall 8c side is connected to the second guide member 16. Abutting and further movement of the endless chain 2 in the pond width direction is suppressed (restricted). Thereby, it is suitably prevented that the drive sprocket wheel 4a of the endless chain 2 in the water surface track is detached.
When the endless chain 2 is lifted and moved in the direction of the settling basin side wall 8c due to sloshing, that is, the endless chain 2 is moved toward the settling basin side wall 8c while being inclined with respect to the pond width direction. Even if it is a case, the front-end | tip part of the plate-type attachment 17 will contact | abut with the 1st guide member 15 or the 2nd guide member 16 which comprises a guide member with an angle. Thereby, the further movement of the endless chain 2 is suppressed (restricted), and the falling off from the drive sprocket wheel 4a is prevented.

  As shown in FIG. 3, on the contact surface of the first flight shoe 18 with the upper guide rail 9a, a protrusion that protrudes toward the bracket 10a at the end on the sedimentation basin side wall 8c side along the pond width direction. It has. The protrusions of the first flight shoe 18 are supposed to be provided to the center of the settling basin 8 along the pond width direction while the flight 3 is traveling on the upper guide rail 9a, that is, on the right side in FIG. This is to prevent the first flight shoe 18 from coming off the upper guide rail 9a even when the flight 3 is moved. When the width in the pond width direction between the end surface of the upper guide rail 9a on the side of the sedimentation basin side wall 8c along the pond width direction and the protruding portion is W1. The gap G2 is preferably smaller than the width W1 in the pond width direction.

Next, the cooperation of the plate-type attachment 17 and the guide member constituted by the first guide member 15 and the second guide member 16 can achieve the function of preventing the endless chain 2 from being removed, as shown in FIG. The possible ranges of the intervals L1, G2, G3 and the overlap width W0 shown will be described. Note that the gap G3 between the bottom surface of the flight 3 and the first guide member 15 shown in FIG.
This contributes to an increase in the likelihood of dimensional accuracy when the guide member composed of the first guide member 15 and the second guide member 16 is installed, and is important in realizing the ease of installation work of the guide member. Is the value.
FIG. 4 shows a side view of the drive sprocket wheel 4a around which the endless chain 2 is wound, and FIG. 5 shows a positional relationship between the guide member and the plate-type attachment attached to the link member. As shown in FIG. 4, the endless chain 2 is configured by fastening a plurality of link members 20 that are chain segments with connecting pins 22. For this reason, two connection pin insertion holes 21 through which the connection pins 22 can be inserted are provided in the vicinity of both ends in the longitudinal direction of each link member 20. In addition, although the connection pin 22 which fastens between the adjacent link members 20 is fixed with a nut, T pin, etc., illustration is abbreviate | omitted in FIG. 3 thru | or FIG.

  The outer diameter OD of the drive sprocket wheel 4a shown in FIG. 4 is 600 mm, for example, the tooth height H is 25 mm, and the width W3 of the link member 20 is 30 mm as an example. As shown in FIG. 4, the two link members 20 arranged opposite to each other in the depth direction are fastened by a connecting pin 22, and the connecting pin engages with teeth provided on the outer periphery of the drive sprocket wheel 4a. As shown in FIG. 1 or FIG. 2, the endless chain 2 formed by fastening the plurality of link members 20 adjacent to each other in the longitudinal direction by the connecting pins 22 when the drive sprocket wheel 4 a is rotationally driven in this state. Then, it is driven around in the sedimentation basin 8.

As shown in the right view of FIG. 5, the plate-type attachment 17 is provided at a substantially central portion in the longitudinal direction of the link member 20 and below the connecting pin 22. As shown in the left diagram of FIG. 5, it is desirable to set the vertical distance L1 between the plate-type attachment 17 and the first guide member 15 to, for example, 15 mm to 20 mm. Further, a gap G2 between the second guide member 16 and the tip end portion of the plate-type attachment 17 facing the second guide member 16 is set to 20 mm, for example. Here, the reason why the distance L1 is set within the range of 15 mm to 20 mm is that the tooth height H of the drive sprocket wheel 4a is 25 mm. That is, when the distance L1 is set to the lower limit value of 15 mm, the distal end portion of the first guide member 15 is positioned substantially on the extension line of the central axis of the connecting pin 22 facing each other. On the other hand, the tooth height H of the drive sprocket wheel 4a, that is, the height from the groove part to which the connecting pin 22 engages to the tooth surface tip part is 25 mm. Therefore, even if the link member 20 constituting the endless chain 2 is lifted upward due to sloshing, the endless chain 2 falls within the range of the tooth height H25 mm, and the endless chain 2 is removed from the drive sprocket wheel 4a. Can be prevented.
On the other hand, when the distance L1 is set to the upper limit value of 20 mm, if the position where the plate-type attachment 17 is provided remains on the lower surface of the link member 20 as shown in the right view of FIG. , It is located 5 mm above the central axis of the opposing connecting pin 22. In this state, even if the link member 20 constituting the endless chain 2 is lifted upward by sloshing, the plate-type attachment 17 is brought into contact with the first guide member 15, and the link member 20 is lifted upward therefrom. To prevent. At this time, the link member 20, that is, the endless chain 2 is not removed from the tooth surface tip of the drive sprocket wheel 4 a having a tooth height of H25 mm. When the distance L1 is set to an upper limit of 20 mm, the tip end portion of the first guide member 15 is arranged so as to be positioned on the extension line of the central axis of the connecting pin 22 facing the plate L, and the plate type attachment 17 is connected to the link member 20. It is good also as a structure distribute | arranged to the position lowered 5 mm below from the lower surface of this. Also in this case, in addition to preventing the endless chain 2 from being removed from the drive sprocket wheel 4a of the link member 20, it is possible to ensure the same distance G3 as when the distance L1 is set to the lower limit value of 15 mm. It becomes possible. That is, the distance G3 between the bottom surface of the flight 3 and the first guide member 15 shown in FIG. 3 can be maintained (the likelihood of the installation dimensional accuracy is maintained), and from the first guide member 15 and the second guide member 16 The ease of installation work of the configured guide member can be maintained.

  As described above, the distance L1 between the first guide member 15 and the plate-type attachment 17 in the vertical direction is set to a range of 3 / 5H ≦ L1 ≦ 4 / 5H with the tooth height H of the drive sprocket wheel 4a as a reference. Further, it becomes possible to prevent the endless chain 2 from being removed by sloshing and to facilitate the installation work of the guide member.

  Further, when the interval G2 is set to 20 mm, for example, the interval G1 shown in FIG. 3, that is, the interval between the side surface of the link member 20 provided with the plate attachment 17 and the second guide member 16 is set to 70 mm, for example. Is done. Therefore, the overlapping width W0 of the first guide member 15 and the plate-type attachment 17 in the pond width direction is 30 mm. Further, if the width W1 in the pond width direction shown in FIG. 3 is set to 27 mm, for example, the link member 20 constituting the endless chain 2 extends along the pond width direction by sloshing as described in FIG. Even if it moves to the sedimentation basin side wall 8c side, the movement amount is suppressed (restricted) to 20 mm. Therefore, the upper guide rail 9 a does not come off from the first flight shoe 18 provided in the flight 3, and the upper guide rail 9 a does not directly contact the bottom surface of the flight 3.

The endless chain 2 formed by fastening two opposing link members 20 shown in FIG. 4 and FIG. 5 and link members 20 adjacent to each other in the longitudinal direction by a connection pin 22 through a connection pin insertion hole 21. The chain pitch, which is the distance between the centers of the connecting pin insertion holes 21 provided in the vicinity of both ends in the longitudinal direction of the link member 20, is generally 150 mm. And the several flight 3 attached so that the endless chain 2 stretched | stretched in parallel with the drive sprocket wheel 4a and the driven sprocket wheels 4b-4d shown in FIG. 1 or FIG. 2 may be arranged at intervals of 3 m. The Therefore, the flight 3 is attached to every 20 link members 20.
FIG. 6 shows a state in which the flight 3 is attached to the endless chain 2 via the flight attachment 23. As shown in FIG. 6, the link members 20 connected in the longitudinal direction are arranged so that one of the two link members 20 adjacent to each other is arranged on the inside and the other is arranged on the outside so as to sandwich it from the outside. Fastened by a pin 22. Here, among the link members 20, the link member 20 disposed on the inner side is referred to as an inner link member, and the link member 20 disposed on the outer side is referred to as an outer link member. The endless chain 2 is configured by alternately arranging these inner link members and outer link members in the longitudinal direction. In FIG. 6, the white arrow indicates the moving direction of the endless chain. In the example shown in FIG. 6, a state is shown in which the flight attachment 23 is fastened to the rear side of the outer link member provided on the lower surface of the link member 20 via one inner link member.

The flight 3 is fixed to the flight attachment 23 via a filler block 24 that is a connecting material.
Further, instead of the above-described method of attaching the flight attachment 23, for example, the following attachment method may be used. It is good also as a structure which attaches the flight attachment 23 from the outer side to the outer link member fastened with the two inner link members adjacently arrange | positioned adjacently by the connection pin 22 from the outer side. In this case, a connection pin for fastening the flight attachment 23 is a connection pin that extends at least as much as the thickness of the flight attachment 23 with respect to the length of the normal connection pin 22. However, in this case, the horizontal width of the endless chain 2 in the portion where the flight attachment 23 is attached is increased by twice the thickness of the flight attachment compared to the above-described configuration. There is an advantage that it becomes easy to attach 3 to a desired position.

FIG. 7 is a diagram illustrating a top view and a side view of the endless chain 23 to which the plate-type attachment 17 is attached and a positional relationship with the guide member (first guide member 15). As shown in the upper part of FIG. 7, for example, the plate-type attachment 17 is provided on the link member 20 at a pitch four times the chain pitch. That is, the plate type attachment 17 is provided on the outer link member for every four link members 20. The width W4 along the longitudinal direction of the link member 20 of the plate type attachment 17 is shorter than the length between the insides of the two connecting pin insertion holes 21 provided in the vicinity of both ends of the link member 20 in the longitudinal direction. Note that the pitch of the plate attachments 17 is not limited to the above, and the plate attachments may be appropriately arranged at a desired pitch.
In the example shown in the middle part of FIG. 7, the plate-type attachment 17 is provided so as to be located further below the lower surface of the link member 20. Here, the plate-type attachment 17 is formed, for example, by forming a single plate made of stainless steel into a substantially L-shaped longitudinal section by pressing or bending. In addition, although it is desirable to bend and form one plate by press work or a bending process, it is not restricted to this. For example, one of the two stainless steel plates (hereinafter referred to as the first plate) is arranged along the side surface of the link member 20 so that the lower end thereof is located below the lower surface of the link member 20, and the other A plate (hereinafter referred to as a second plate) may be joined to the lower end of the first plate by welding or the like so that the second plate is substantially perpendicular to the first plate. As shown in FIG. 4 or FIG. 5, when the plate-type attachment 17 is provided on the lower surface of the link member 20, a single stainless plate may be joined to the lower surface of the link member 20 by welding or the like. good. Alternatively, one stainless steel plate is cut out to obtain a flat plate in which the contours of the link member 20 and the plate attachment 17 are continuous, and then the plate attachment 17 is formed at the bottom of the link member 20 by pressing or bending. May be formed to be substantially vertical. The plate attachment 17 is not limited to a metal material such as stainless steel, and may be made of, for example, a synthetic resin. In this case, the plate attachment 17 may be formed by injection molding or the like.

  The first guide member 15 indicated by a dotted line in the lower part of FIG. 7 is arranged so as to cover the two plate-type attachments 17 and is installed by the second guide member 16 at the front end (FIG. 3) of the bracket 10a in the pond width direction. The length of the first guide member 15 is not limited to the length covering the two plate attachments 17. That is, it is sufficient if the length covers the plurality of plate-type attachments 17. Further, the guide member constituted by the first guide member 15 and the second guide member 16 is substantially L-shaped in longitudinal section by pressing or bending a stainless steel plate, for example, in the same manner as the plate-type attachment 17 described above. Formed into a shape. Further, the two plates may be connected by welding or may be formed of a synthetic resin.

  In the present embodiment, the case where the guide member constituted by the first guide member 15 and the second guide member 16 is installed at the tip of the bracket 10a supporting the upper guide rail 9a in the pond width direction has been described as an example. However, it is not limited to this. For example, in addition to the guide member installed at the tip of the bracket 10a, the bracket 10b that supports the intermediate guide rail 9b may be installed at the tip of the bracket 10b in the pond width direction.

According to the present embodiment, it is possible to realize a sludge scraping machine that can prevent the endless chain from being removed from the sprocket wheel due to sloshing and that can facilitate the guide member installation work.
Specifically, a guide member supported on the side wall of the settling basin and disposed below the bottom surface of the flight 3 is disposed to face the guide member at a predetermined interval in the vertical direction and the pond width direction, toward the settling pond side wall. Since the extending or projecting plate is arranged below the connecting pin 22 of the endless chain 2, it is possible to improve the likelihood of dimensional accuracy when installing the guide member. That is, the guide member can be easily installed.

  FIG. 8 is a diagram showing a top view and a side view of an endless chain to which a plate-type attachment used in the sludge scraping machine of Embodiment 2 according to another embodiment of the present invention is attached, and an arrangement relationship with a guide member. is there. In the first embodiment, the first guide member 15 is arranged to cover the plurality of plate-type attachments 17. The present embodiment is different from the first embodiment in that the first guide member 15 is arranged so as to cover only one plate-type attachment 17. Other configurations are the same as those of the first embodiment described with reference to FIGS. 1 to 6, and the description overlapping with the first embodiment is omitted below.

As shown in the lower part of FIG. 8, the sludge scraping machine of the present embodiment covers the first guide member 15 with one plate-type attachment 17, and another link provided with the plate-type attachment 17 positioned behind the first guide member 15. It has a length that covers the front link member 20 that is fastened to the member 20 by the connecting pin 22. In other words, the first guide member 15 has a length that is four times the chain pitch, and is installed by the second guide member 16 at the tip of the bracket 10a in the pond width direction (FIG. 3).
Note that the length of the first guide member 15 may be changed from 4 times to 3.5 times the chain pitch. Even in this case, the first guide member 15 can always cover one plate-type attachment 17 provided on the link member 20 of the endless chain 2 moving on the water surface track, and the drive sprocket of the endless chain 2 by sloshing It is possible to prevent wheel removal from the wheel 4a.

  In the present embodiment, the case where the guide member constituted by the first guide member 15 and the second guide member 16 is installed at the tip of the bracket 10a supporting the upper guide rail 9a in the pond width direction has been described as an example. However, it is not limited to this. For example, in addition to the guide member installed at the tip of the bracket 10a, the bracket 10b that supports the intermediate guide rail 9b may be installed at the tip of the bracket 10b in the pond width direction.

  According to the present embodiment, since the length of the guide member can be reduced in addition to the effects of the first embodiment, the component material cost of the guide member can be reduced as compared with the first embodiment.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. Further, it is possible to add, delete, and replace the configurations of other embodiments with respect to a part of the configurations of the embodiments.

DESCRIPTION OF SYMBOLS 1 ... Sludge scraper 2 ... Endless chain 3 ... Flight 4a ... Drive sprocket wheel 4b, 4c, 4d ... Drive sprocket wheel 5 ... Drive device 6 ... Scum skimmer 7 ... Overflow trough 8 ... Sedimentation basin 8a ... Sedimentation basin upstream wall 8b ... sedimentation basin downstream wall 8c ... sedimentation basin side wall 9a ... upper guide rail 9b ... intermediate guide rail 9c ... bottom guide rails 10a, 10b ... bracket 11 ... drive shaft 12 ... intermediate shaft 13 ... tail shaft 14 ... head shaft 15 ... first Guide member 16 ... Second guide member 17 ... Plate type attachment 18 ... First flight shoe 19 ... Second flight shoe 20 ... Link member 21 ... Connection pin insertion hole 22 ... Connection pin 23 ... Flight attachment 24 ... Filler block

Claims (11)

In the sludge scraper that drives around the endless chain of two strips with a plurality of flights attached by the drive installed at the top of the settling pond,
An upper guide rail that supports the vicinity of the end of the flight traveling on the water surface track from below;
A plurality of first brackets having one end fixed to the side wall of the settling basin, the other end extending toward the center of the settling basin, and supporting the upper guide rail from below;
The two endless chains include a plurality of link members fastened by connecting pins, and a plate projecting toward the side wall of the settling basin in a pond width direction below the connecting pins of the link members. Provided on the side surface of the link member at a predetermined interval along the longitudinal direction of the chain,
On the side wall side of the settling basin, there is a guide member extending to the center side of the settling basin in the pond width direction,
The guide member is located above the plate and below the bottom surface of the flight, and is arranged so as to overlap the plate at a predetermined interval , and a second guide member that stands up, and A first guide member extending from the upper end of the second guide member to the center side of the settling basin in the pond width direction, and the second guide member and the tip of the plate in the pond width direction are Arranged at predetermined intervals in the pond width direction,
A drive sprocket wheel disposed near the water surface track and provided on both ends of the drive shaft to which the rotational force of the drive device is transmitted;
The sludge scraper according to claim 1, wherein the vertical distance between the first guide member and the plate is set in a range of 3/5 to 4/5 times the tooth height of the drive sprocket wheel . In the sludge scraper according to claim 1,
A driven sprocket wheel provided on both ends of the intermediate shaft disposed near the water surface track and downstream of the drive shaft;
A driven sprocket wheel provided near the bottom surface of the settling basin and on both ends of the tail shaft disposed downstream of the intermediate shaft;
A driven sprocket wheel provided near the bottom surface of the settling basin and on both ends of the head shaft disposed on the upstream side of the drive shaft,

An intermediate guide rail that supports the vicinity of the end of the flight that travels between a driven sprocket wheel provided on both ends of the intermediate shaft and a driven sprocket wheel provided on both ends of the tail shaft from below;
One end fixed to the side wall of the sedimentation tank and the other end extends toward the center of the sedimentation basin, characterized Rukoto and a plurality of second bracket for supporting from below the intermediate guide rail sludge Scraper. In the sludge scraper according to claim 2,
The second brackets are spaced apart from each other at predetermined intervals on the side wall of the settling basin,
The sludge scraping machine , wherein the guide member is disposed at a tip end portion of the second bracket . In the sludge scraper according to any one of claims 1 to 3 ,
The first brackets are arranged on the side wall of the settling basin at predetermined intervals along the water surface trajectory,
The guide member, the sludge raking device, wherein Rukoto disposed on the tip portion of the first bracket. In the sludge scraper according to any one of claims 1 to 4 ,
The sludge scraping machine, wherein the plate is disposed near the lower surface of the link member . In the sludge scraper according to any one of claims 1 to 5 ,
The plate is
A first plate portion whose lower end is positioned below the lower surface of the link member along the side surface of the link member;
And a second plate portion disposed below the lower surface of the link member and projecting toward the side wall of the settling basin . In the sludge scraper according to claim 6,
The plate is formed of one plate by pressing or bending a vertical section substantially L-shaped, the sludge raking device, characterized in that forming the said first plate portion and a second plate portion. In the sludge scraper according to any one of claims 1 to 7 ,
Before Kiga id member is formed of one plate by pressing or bending a vertical section substantially L-shaped, the sludge raking device, characterized in that forming the said first guide member and second guide members. In the sludge scraper according to claim 8 ,
The first guide member is disposed along a side wall of the settling basin so as to cover the plurality of plates . In the sludge scraper according to claim 8 ,
The length along the side wall of the settling basin of the first guide member is the longitudinal direction of the endless chain, and is shorter than the interval between the link members provided with the plates,
The sludge scraping machine, wherein the first guide member is disposed so as to cover only one of the plates while the endless chain is traveling on a water surface track . In the sludge scraper according to any one of claims 8 to 10 ,
A tip portion of the first guide member that extends toward the center of the settling basin along the pond width direction is disposed at a predetermined interval from the link member that forms an endless chain that travels on a water surface track, and The sludge scraper according to claim 1, wherein a distal end portion of the first guide member is disposed in the vicinity of an extension line of a central axis of a connecting pin for fastening the link member.

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