JP2020175363A - Sludge scraping device - Google Patents

Abstract

To provide a sludge scraping device that enables a sludge scraper to move backward so that sludge on a haunch can be sufficiently scraped.SOLUTION: A sludge scraping device comprises machine bodies in lengthy shapes configured to be able to move back and forth by placing wheels on a guide trajectory such as a guide rail 7, on a bottom wall of a rectangular sedimentation basin comprising a rear side end wall 3 having a haunch 8 at a lower end thereof, where the machine bodies comprise mounting bases arranged at front and rear places and machine body-main bodies in lengthy shapes that connect the mounting bases to one another. On the mounting bases are supported sludge scrapers 53 that can rotate forward and backward through scraper axes 50 and axial levers are protrudingly provided at outer peripheries of the scraper axes. Front ends of rear interlocking links 89 whose rear ends are connected to lower tips of rear axial levers 90 protruded from rear-side scraper axes are connected to rear parts of forward/backward movement switch interlocking materials through lower protruding piece 64 of the forward/backward movement switch interlocking materials, and the other ends of conductive bar materials 66 wound around tail-side wheels 88 are connected to the protruding pieces so that the ends are parallel to the rear interlocking links.SELECTED DRAWING: Figure 12

Description

The present invention relates to a sludge scraping device.

The rectangular sedimentation pond has the short side of the rectangle as the front and rear end walls and the long side as the left and right side walls facing each other in the width direction, and also has a bottom wall, and sludge is provided on the front end wall side, which is the sludge approaching direction of the bottom wall. It has a three-dimensional skeleton structure with pits. The front end wall corresponding to the upper part of the pit of the sedimentation basin is regarded as the upstream side, and an inflow culvert for introducing sewage guided from the outside of the sedimentation basin is provided on the upper side, and the outlet of the inflow basin into the pond While rectifying sewage through the rectifying holes of the porous rectifying wall (plate) provided in a transverse manner, the sludge is sent into the sedimentation basin in a very slow flow and slowly flows downstream as it is to promote sedimentation on the bottom wall. The sludge is settled in the water. The sludge that has settled on the bottom wall is scraped up to the sludge pit by a sludge scraping device, collected, and discharged to the outside of the pit.
There are various sludge scraping devices, and Patent Document 1 is shown here as an example.

JP 2017-148791

The sludge scraping device disclosed in Patent Document 1 is provided with a guide rail fixed so as to pass through the center of the pond width at the bottom of the pond, and the guide rail is moved forward and backward via a pair of front and rear wheels. Equipped with an aircraft. This machine is equipped with a body with a long round pipe, and a front mount is installed at the front end of the body and a rear mount is installed at the rear end, and a pair of left and right bearings are fixed to each. , These are equipped with sludge scrapers in the front and rear via a scraper shaft. Then, for example, the sludge scraper is set to a vertical sludge scraping posture after retreating by a link chain drive system, is advanced together with the aircraft, and is made to drop sludge into the pit by scraping sludge toward the front pit. When the sludge scraper advances and finishes scraping, the sludge scraper is put into a lifting state without scraping back, and while maintaining that state, it returns to the original position behind.
However, the drive means in Patent Document 1 has a drive source with a drive wheel, a head-side wheel, and a tail-side wheel as a rotary drive system, and a conductive strip is wound around them, and a connecting rod is formed between the ends thereof. It is connected. Then, at the rear of the device, a rear mounting base is connected to the rear of the round pipe-shaped body (main body), a pair of left and right bearings are provided on the rear mounting base, and a sludge scraper is mounted by supporting the scraper shaft via these bearings. Further, a rear lever (lever around the rear shaft) is projected so as to descend forward around the scraper shaft, and the rear end of the connecting rod (advance / retreat switching interlocking material) is connected.
In such a structure, the sludge scraper is returned to the haunch while being lifted, and the sludge scraper swings on the haunch by switching the connecting rod (advance / retreat switching interlocking material) in the forward direction so as to scrape off the haunch. By scraping the accumulated sludge downward and forward, the sludge is scraped toward the pit side without leaving any sludge, which leads to improvement in water quality. For that purpose, it is necessary to return the sludge scraper to full, but in the conventional method, even if the tail side wheel is placed as far back as possible on the haunch side, the end of the connecting rod (advance / retreat switching interlocking material) However, it was not possible to retract beyond the peripheral point of the tail wheel, so the sludge scraper could only retract to the front with sufficient margin.

The present invention is to solve the above problem, and when the rear sludge scraper returns, the sludge settled on the haunch can always be retracted to a sufficient extent to scrape off the sludge on the haunch. It is an object of the present invention to provide a sludge scraping device that can be scraped off by a sludge scraper and can be scraped into a pit to help improve water quality.

In order to achieve the above object, the invention according to claim 1 is for a rectangular sedimentation pond including front and rear end walls having a haunch at the lower end on the rear side, left and right side walls, and a bottom wall with sludge pits. It is equipped with a long aircraft that can move forward and backward with wheels on a guide track such as a guide rail set at a position along the center of the width of the pond on the bottom wall, and this aircraft is at least front and rear. It is equipped with a mounting base deployed at a location and a long body that connects the mounting bases to each other, and each mounting base supports a sludge scraper in a state where it can rotate back and forth via a scraper shaft, and the scraper shaft. A lever around the axis is projected on the outer circumference of the shaft, and the drive means for rotating the sludge scraper up and down and moving the aircraft forward and backward has a drive source on the pond and wheels on the head side and tail side as a rotation drive system. However, one end of the conductive strip material such as the link chain hung on the rotary drive system is interlocked with the front end of the advancing / retreating switching interlocking material that advances and retreats along the main body of the machine, and the other end is interlocked with the rear part of the advancing / retreating switching interlocking material. In the sludge scraping device, the front end of the rear interlocking link is advanced and retreated at the rear part of the advancing / retreating switching interlocking material by connecting the rear end to the lower tip of the lever around the rear shaft projecting from the scraper shaft on the rear side. It is connected via a projecting piece from the switching interlocking material, and the other end of the conductive strip material hung around the tail side wheel is connected to the projecting piece side so as to be in a parallel relationship with the rear interlocking link. It is characterized by being. The above configuration is also applicable to a sludge scraping device of a two-water channel one-drive system.

As described above, the invention according to claim 1 is on the bottom wall of a rectangular sedimentation pond including front and rear end walls having a haunch at the lower end on the rear side, left and right side walls, and a bottom wall with sludge pits. It is equipped with a long aircraft that can move forward and backward by attaching wheels to a guide track such as a guide rail set at a position along the center of the pond width, and this aircraft is installed at least in the front and rear locations. It is equipped with a base and a long body that connects the mounting bases to each other. Each mounting base supports a sludge scraper that can rotate back and forth via a scraper shaft, and the outer circumference of the scraper shaft A drive means in which a lever around the shaft is projected to rotate the sludge scraper up and down and to move the aircraft forward and backward has a drive source on the pond and wheels on the head side and tail side as a rotation drive system. Conductive strips such as link chains hung on the system are sludge scraping, one end of which is interlocked with the front end of the advancing / retreating switching interlocking material that advances and retreats along the main body of the aircraft, and the other end of which is interlocked with the rear of the advancing / retreating switching interlocking material. In the device, at the rear part of the advance / retreat switching interlocking material, the front end of the rear interlocking link connecting the rear end to the lower tip of the rear shaft peripheral lever projecting from the scraper shaft on the rear side is from the advancing / retreating switching interlocking material. It is characterized in that it is connected via a projecting piece, and the other end of the conductive strip material hung around the tail side wheel is connected to the projecting piece side so as to be in a parallel relationship with the rear interlocking link. Therefore, when the rear sludge scraper returns, it is possible to retract to a point sufficient to scrape off the sludge on the haunch, so that the sludge that has settled on the haunch is always scraped off by the sludge scraper and goes to the pit. It is possible to provide a sludge scraping device that can scrape and help improve the water quality.

A cross-sectional view showing an embodiment of the present invention corresponding to the line I-I of FIG. FIG. 1 is a sectional view taken along line II-II of FIG. The laying state diagram of the guide rail. Explanatory view of arrow view decomposition from the IV direction of FIG. FIG. 2 is an enlarged sectional view taken along line VV of FIG. FIG. 5 is a sectional view taken along line VI-VI of FIG. FIG. 2 is a sectional view taken along line VII-VII of FIG. A cross-sectional view showing the state of the rear part of the device when moving forward. FIG. 8 is a sectional view taken along line IX-IX of FIG. A cross-sectional view showing the state of the rear part of the device during the return process. FIG. 10 is a sectional view taken along line XI-XI of FIG. A cross-sectional view showing the state of the rear part of the device at the end of return. FIG. 12 is a sectional view taken along line XIII-XIII of FIG. The cross-sectional view which shows the comparative example at the time of returning. FIG. 14 is a cross-sectional view taken along the line XV-XV of FIG. The cross-sectional view which shows the comparative example at the time of return termination. FIG. 16 is a sectional view taken along line XVII-XVII of FIG. Enlarged cross-sectional view of the drive unit. The vertical sectional view of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 9. FIGS. 1 to 9 show a state in a forward squeezing (developing) state.
1 in these figures is a rectangular sedimentation basin, the left side of the figures in FIGS. 1 and 2 is the upstream side and the right side is the downstream side, 2 is the front end wall, 3 is the rear end wall, and these end walls 2 and 3 Corresponds to the short side of the rectangle when viewed from above, and the long side of the rectangle corresponds to the left and right side walls 4 facing in the pond width direction. A rectifying plate (wall) with a rectifying hole (not shown) is provided on the upper part of the front end wall 2, and sewage introduced into the inflow culvert (not shown) on the left side of the rectifying plate (not shown) is passed through a large number of rectifying holes at a very slow speed. It is designed to be introduced into the sedimentation basin 1.
Reference numeral 5 denotes a bottom wall (the bottom of the pond), and a sludge pit 6 is recessed on the sludge scraping direction side, which is the front end wall 2 side thereof. A suction pump for the collected sludge is provided in the pit 6.

A guide rail (guide track) 7 is laid on the bottom wall 5 in the settling basin 1 so as to be concentric with the central line between the widths of the basin. As shown in FIG. 3, the guide rail 7 has an angle-shaped long (around 4 m) main body portion composed of a horizontal plate portion 7a and a vertical plate portion 7b, and a lip that projects horizontally shortly at the upper end thereof. It is made of a SUS angle material with a lip having a single portion 7c. The plurality of guide rails 7 are arranged symmetrically with respect to the center line of the pond width so that the lip pieces 7c face each other with a pair of left and right guide rails 7, and the rear end is a tail side haunch portion on the rear end wall 3 side. The front ends are arranged in series so as to come to the front of the sludge pit 6 and to be connected to the front and back so as to be on the sludge pit 6. The guide rails 7 ... Are not integrally connected by a plurality of bottom strips connecting the left and right, but are completely independent on the left and right, that is, as shown in FIG. 5, they are in series for a long time. In addition, while forming a plurality of head-hidden portions 7d ... Which are symmetrically arranged and have a round concave shape and holes, a plurality of concave holes 5a ... Are formed at corresponding positions on the bottom wall 5 side to form the anchor bolt 9. By fixing to the chemical insert 10, the guide rails 7 ... Are arranged and fixed on the bottom wall 5 at intervals of about 400 mm. Reference numeral 11 denotes a scum removing device installed on the surface of the pond.

Reference numeral 13 denotes a SUS machine body, which has two front and rear body bodies 14, 14 and a front mounting base 15, an intermediate mounting base 16, and a rear mounting base 17.
The machine body 14 may be a round pipe, but in consideration of the fact that sludge tends to collect on the upper peripheral surface of the round pipe, in this embodiment, as shown in FIG. 4, a long quadrangle made of SUS is used. The basic rule is that one vertex (ridge angle) is directly above. In particular, the airframe body 14 has side bodies 20 and 20 made of a pair of left and right angle members, and is divided into left and right parts, and is provided with projecting pieces 21 that also serve as reinforcement above and below the side bodies 20 and 20. ing. The left and right projecting pieces 21 and 21 are integrally arranged so as to face each other over the entire length of the side body 20 with a slight gap, but they are connected via a joining spacer 22 ... Except for a part in the front-rear direction between them. ing. On the upper side, the front and rear two front and rear switching upper protrusions 59 and 59, which will be described later, advance and retreat.
On the lower side, the front and rear forward / backward switching lower protrusions 64 and 64, which will be described later, are the front and rear, respectively.
Corresponds to this. All of the upper and lower sides except for them are in a state of being joined by the joining spacer 22 ... With the fastener 23, but in particular, the lower projecting pieces 64 and 64 move forward and backward.
There is also. This is so that sludge that has entered through the gap between the ranges where the upper projecting piece 59 advances and retreats can be removed from the place where the joint spacer 22 is not present.

A quadrangular end plate 25 is provided at each of the front and rear ends of the side body 20 so that the side body 20 can be detachably attached to an end mounting frame described later via a fastener 26. The hole through which the fastener 26 of the end mounting frame is passed is a large hole in which the bolt can be moved and adjusted.
Inside each of the front and rear body 14, a square cylinder-shaped advance / retreat switching interlocking member 28, which is slightly smaller than the body 14, is provided so as to be concentric with the body 14 so as to be able to move forward and backward.

The front mounting base 15 and the intermediate mounting base 16 have the same structure, and the rear mounting base 17 has the same structure as the mounting bases 15 and 16 except for a part (direction of the mounting base main body), so that they all have the same structure. If there is, it will be described below.
The front mounting base 15 has a pair of left and right end mounting frames 30. The end mounting frame 30 has a groove-shaped frame shape having an outer side vertical plate portion 31 and front and rear vertical plate portions 32, 32 integrally, and a scraper shaft passes through the upper portion of the side vertical plate portion 31. A U-shaped groove 33 is provided, and a bottom receiving plate 34 is horizontally fixed in a transverse manner in the upper portion of the vertical plate portion 31 on the same side surface. Downward steady rest members 35, 35 are fixed to the left and right ends of the bottom receiving plate 34.
The end mounting frame 30 may have a groove opening facing outward as shown in the upper right column of FIG. 4, or may have a square tubular shape as shown in the lower column thereof. In these cases, the mounting base body 37, which will be described later, is not inserted into the groove and fixed, but is fixed to the inner surface of the end mounting frame 30.

Reference numeral 37 denotes a mounting base body, and the main body 37 is an angle type having a top plate 38 and an elevation plate 39 so that the left and right ends thereof are below the bottom receiving plates 34 of the mounting frames 30 and 30 at both ends. It is fixed. The lower portion 39a between the left and right sides of the elevation plate 39 extends widely downward, and the end plate 25 is attached to that portion. The bottom receiving plate 34 may be omitted, and the upper surface plate 38 of the mounting base body 37 may be replaced with the bottom receiving plate 34.

Reference numeral 41 denotes a fixing lid, which is made of a flat groove type material and is fixed to the upper end of the end mounting frame 30 by a fastener 42 such as a tap screw. A pair of upper steady rest members 43 are also fixed to the left and right sides of the fixing lid 41. Reference numeral 45 denotes a wheel, which is rotatably mounted via the axle 46 in the lower portion of the end mounting frame 30 at a position corresponding to the lower side of the scraper shaft.

50 is a scraper shaft made of SUS made of one round pipe, which is slightly shorter than the width of the pond, and is divided into upper and lower parts so that it matches the left and right bottom bearing plates 34 and 34 at the two central points. The resin block bearing 51 of the above is equipped. The bearing 51 is made considerably shorter and more compact than the bolted type shown in Patent Publication 1 because it does not have a bolted structure. The number of bearings 51 is 4 on the left and 2 on the front, 4 on the rear, at least 4 in the middle, 8 or 12 if there are many scrapers in the middle, and so on. As the number of special resins becomes very large, making the special resin smaller and more compact as described above leads to a great cost reduction. The front-rear length is about 20 to 30 mm longer than the diameter (65 mm) of the scraper shaft 50, for example, 105 to 125 mm.

The bearing 51 is fitted between the bottom steady rest members 35 and 35 of the bottom receiving plate 34, and the fitted bearing 51 is pressed from above by the attachment of the fixed lid 41 to prevent the upward runout. The position is regulated between the materials 43 and 43 so as to prevent left-right runout, front-back runout, and up-down runout. The internal height of the upper surface of the bottom receiving plate 34 and the upper end of the end mounting frame 30 is basically the same as the height of the bearing 51, or the bearing 51 is set to be slightly higher.

A pair of left and right anti-slip rings 52 that regulate the left-right movement of the bearing 51 are fixed by welding around the scraper shaft 50. A sludge scraper 53 is provided at the lower part of the scraper shaft 50, and an auxiliary scraper 54 is provided at the upper part, and a partition plate 55 is provided. An axial lever 57 is projected at an intermediate position corresponding to the left and right bearings 51 of the scraper shaft 50, and the interlocking link 58 having a front end connected to the lever 57 connects the rear end to the advance / retreat switching upper protrusion 59. Has been done.

The advance / retreat switching upper projecting piece 59 is projected from the upper ridge angle portion of the advancing / retreating switching interlocking member 28. The advancing / retreating switching interlocking member 28 is a single piece and is provided with a slidable resin liner 62 on the outer peripheral side thereof, and is slidably mounted in the machine body 14 under the switching stroke S. In FIGS. 1 to 7, the advance / retreat switching interlocking member 28 is adapted so that the tip of the advancing / retreating switching interlocking member 28 hits the front end (end plate 25) of the front body 14 for advancing to give a forward force to the airframe. One of the machine body 14 is connected between the front mounting base 15 and the intermediate mounting base 16, and the next one is also connected between the intermediate mounting base 16 and the rear mounting base 17. The end plates 25 and 25 are connected to the elevation plate 39 of the intermediate mounting base 16 from the front and rear, and the advancing / retreating switching interlocking member 28 is passed through the plate surface freely (not shown). Is open. The mounting base body 37 of the rear mounting base 17 is provided so that the elevation plate 39 is on the front side, unlike that of other mounting bases. This is to prevent the lever 57 around the axis at the center between the widths of the rear pond, which will be described later, from interfering with the lifting and rotating at the time of return.

A forward / backward switching lower protrusion 64 is projected at a position corresponding to the lower part of the upper protrusion 59 at the front portion of the advance / retreat switching interlocking member 28, and a front conduction anchor 65 is attached to the lower end thereof. Although the upper projecting piece 59 and the lower projecting piece 64 are made of SUS, resin plates may be laminated on both the left and right sides so as to be slippery with respect to the machine body 14. One end of a conductive strip 66 such as a link chain or a wire rope is connected to the front conductive anchor 65.
The conductive strip 66 is guided to the upper drive unit 75 via the left wheel 70 of the pair of left and right head side wheels 70 and 71 arranged on the receiving plate 68 passed to the tip of the guide rail 7. In FIG. 2, the head-side wheels 70 and 71 are actually provided on the tip of the guide rail 7, but in the drawing, the action part of the reversing switching mechanism described later is shown at the same place and the display is duplicated. It is displayed by shifting it to the left to avoid it. In FIG. 1, the wheels 70 and 71 are actual position displays.

The drive unit (main part of the drive means) 75 is also shown in FIGS. 18 and 19, and the rectangular frame-shaped drive base 78 is cushioned by the cushioning material 79 on the pond wall 76 via the mortar base 77. Fix and prepare as you do. A pair of bridge plates 80 are fixed in the drive base 78 on the left and right sides of the pond, and the height of the receiving plate 81 can be changed by the height adjusting bolt 82 via the cushioning material 79. It is installed. A drive source 83, which is a motor with a speed reducer, is mounted on the plate 81 in a height-adjustable state via a bottom plate thereof.

85 is a drive shaft, 86 is a drive wheel, and the conductive strip 66 via the one 70 on the left side of the head side wheel is hung around the drive wheel 86 from the front side of FIGS. 2 and 19, and is rotated to the other side. The conductive strip 66 is turned to the tail side wheel 88 of FIG. 1 via the one 71 on the right side of the head side wheel, and then connected to the rear interlocking link 89 as shown in FIGS. 8 and 9. Here, the rear end of the rear interlocking link 89 is connected to the end portion of the conductive strip 66 and also to the lower end of the lever 90 around the rear axle.

The reason why the rear axle lever 90 is connected in parallel to the rear end of the rear interlocking link 89 in addition to the end of the conductive strip 66 is as follows.
14 and 15 show a state before the return (slightly before the end), and FIGS. 16 and 17 show a conventional comparative example showing the state at the end of the return. Conventionally, a roller 121 is used to drive the advancing / retreating switching interlocking member 122 back and forth on the body 120 of a round pipe, and one end of the conductive strip 123 is at the left end and the other end of the conductive strip 123 is at the right end (not shown). Part) is connected. In this case, the advancing / retreating switching interlocking member 122 has a rear end front portion coupled to an axial lever 125 around the scraper shaft 124, and the rear end of the advancing / retreating switching interlocking member 122 is further extended rearward to the rear end. The conductive strip 123 is connected.

In such a structure, the sludge scraper 126 is returned onto the haunch 127 while being lifted, and the sludge scraper 126 swings so as to scrape off the haunch 127 by switching the advancing / retreating switching interlocking member 122 in the forward direction. By scraping down the sludge accumulated on the top in the forward and downward directions, the sludge is scraped toward the pit side without leaving any sludge, which leads to improvement in water quality. For that purpose, it is necessary to return the sludge scraper 126 to the full position as shown at the right end in FIG. 17, but in the conventional method, assuming that the tail side wheel 128 is arranged as far back as possible on the haunch 127 side. However, as shown in FIG. 16, the end of the advance / retreat switching interlocking member 122 cannot be retracted to the point where it exceeds the peripheral point a of the tail side wheel 128. Therefore, the sludge scraper 126 reaches the front b of FIG. However, I was able to retreat with sufficient margin.

Therefore, in the present embodiment, FIGS. 8 to 13 (FIGS. 8 and 9 are in the forward direction, FIGS. 10 and 11 are in the middle of the return, and FIGS. 12 and 13 are in the end of the return (before the transition to the scraping posture)). As described above, in addition to the end portion of the conductive strip 66, the rear shaft peripheral lever 90 was connected to the rear end of the rear interlocking link 89 in a parallel relationship. Then, as shown in FIG. 12 (at the end of return), the rear interlocking link 89 connected to the advance / retreat switching lower projectile 64 at the end of return pushes the lever 90 around the rear axle to the full extent to fill the sludge scraper 53 to the top of the haunch portion 8. Even if it is brought to, the end of the conductive strip 66 does not move to a position slightly behind the rear end (right end in the figure) of the rear interlocking link 89, and the peripheral position of the tail side wheel 88. There is a margin length c close to the point, and as a result, the sludge scraper 53 can swing down on the haunch portion 8 in the scraping direction with sufficient margin, always scraping off the sludge on the haunch portion 8. You will be able to shift to a sludge posture. Reference numeral 91 denotes a strip guide for guiding the conductive strip 66 that moves back and forth between the head side wheel 71 and the tail side wheel 88, and is composed of an angle-shaped main body, bolts, chemical anchors, and the like. Reference numeral 92 denotes a floating prevention roller, which comes into contact with the guide rail 7 via a bracket 93 attached to the end mounting frame 30 to prevent lifting.

On the other hand, on the drive unit 75 side, as shown in FIGS. 2, 18, and 19, a through port 95 is opened in the pond upper wall 76, and the upper portion of the conductive strip 66 is passed through the through port 95. However, the transmission material 97, which is a part of the reversing switching mechanism 96, is passed through the through port 95 in the same manner. In this embodiment, since there is a transfer plate 80 where the transmission material 97 passes, an insertion hole 80a is formed in the transfer plate 80 so that the transfer member 80 can pass through the transfer plate 80. The transmission material 97 is made of a wire rope, a link chain, or the like, and is hung on a conversion wheel 99 rotatably provided in a space sealed by a drive unit cover 98. A response roller 101 having a weight function is provided at one lower end of the transmission material 97 via an elevating rod 100, and can move up and down along a roller guide 102 with an elongated hole erected on a receiving plate 68. It is set to. The roller guide 102 is lifted at the scraping end by advancing the working member 103, which is a tip wedge-shaped actuator projecting horizontally from the mounting base body 37 on the front mounting base 15 side. ..

On the other hand, in the portion of the transmission material 97 beyond the conversion wheel 99, a vertically long elevating and lowering reaction material 105 with a long hole is provided with a weight function, and the elevating and lowering reaction material 105 projects from the receiving plate 81. Along with 106, the guide roller 107 can easily guide the vehicle up and down. 109 is a switch actuator projecting from the elevating reaction member 105, 110 is a reversing detection switch, 111 is a switch mounting bar, 111 is a reversing auxiliary switch, and the drive source 83 is reversing and responding by acting on the reversing detection switch 110. Then, the conductive strip 66, which had a traction action in the scraping direction X, is switched to a traction action in the return direction Y. The roller guide 102 is lifted by retracting the working member 103 and lowering the response roller 101, but the inverted state of the drive source 83 is maintained by a holding circuit (not shown). In the past, a working member was provided at the outer end of the scraper shaft to form a reversing switching mechanism installed so as to face the side wall of the pond, so that the reversing switching was unstable. On the other hand, as in the present embodiment, the working member 103 is installed at a position near the center of the width of the machine where malfunction is unlikely to occur, and the reversing switching mechanism 96 is also installed at a position corresponding to the operating member 103 to operate. Therefore, the reversal response became unstable in some cases and caused a malfunction. It should be noted that a drive source is not configured on the downstream side of the sedimentation basin, but a similar reversal switching mechanism is configured.

1 to 7 show when the three sludge scrapers 53 ... in the front and rear are in a vertically lowered posture and the wheels 45 ... are advanced on the guide rail 7 and the forward end is about 2 m in front of the pit 6. It shows the state of. The conductive strip 66 pulls the front conductive anchor 65 forward by being pulled in the X direction by the drive unit 75, whereby the advance / retreat switching interlocking member 28 is advanced and applied to the end plate 25 to give a forward force. The sludge scraper 53 is brought into a vertical scraping state from the projecting piece 59 via the interlocking link 58 and the shaft circumference lever 57. The sludge scraper 53 in the middle is also brought into a vertical scraping state via the upper projecting piece 59, the interlocking link 58, and the shaft rotation lever 57. The sludge scraper 53 at the rear is brought into a scraping state as shown in FIG. 2 via the lower projectile piece 64, the rear interlocking link 89, and the lever 90 around the rear axle. The advance / retreat stroke of the aircraft is set to be slightly longer with respect to the front-rear distance between the three sludge scrapers 53 ... By setting such a setting, for example, the sludge scraper 53 at the rear is scraped by advancing (scratching). Since the sludge position is set to be slightly before the position when the intermediate sludge scraper 53 is lifted and returned to the state of being scraped, the sludge afterwards is moved by the advancement and retreat of the plurality of sludge scrapers 53. The whole cycle is repeated by scraping forward one after another and finally scraping into the sludge pit 6 by the sludge scraper 53 at the front.

When the working member 103 advances and the drive source 83 is reversely driven by the reaction of the reverse switching mechanism 96, the conductive strip 66 is driven in the Y direction opposite to X, and as a result, the rear sludge scraper 53 is rearward. The shaft circumference lever 90 is pulled backward to raise it, and the advance / retreat switching interlocking member 28 is pulled backward, and the middle and front upper projecting pieces 59 are pulled backward to cause sludge scrapers in the middle and front. As 53 and 53 rise forward, the advance / retreat switching interlocking member 28 hits the end plate 25 in front of the rear mounting base main body 37, so that the machine body 13 is pulled back and returned.

1 ... Sedimentation pond 2 ... Front end wall 3 ... Rear end wall 4 ... Side wall 5 ... Bottom wall 6 ... Sludge pit 7 ... Guide rail 13 ... Aircraft 14 ... Aircraft body 15 ... Front mounting base 16 ... Intermediate mounting base 17 ... Rear Mounting base 30 ... End mounting frame 31 ... Side vertical plate part 32 ... Vertical plate part 37 ... Mounting base body 45 ... Wheels 46 ... Axle 50 ... Scraper shaft 53 ... Sludge scraper 57 ... Shaft circumference lever 66 ... Conducting strip 75 ... Drive Part 83 ... Drive source 90 ... Rear axle lever 96 ... Reverse switching mechanism.

Claims (1)

A guide rail or the like set at a position along the center of the width of the bottom wall of a rectangular sedimentation pond having front and rear end walls having haunches at the lower end on the rear side, left and right side walls, and a bottom wall with sludge pits. It is equipped with a long-shaped aircraft that can move forward and backward with wheels attached to the guide track, and this aircraft is a long-shaped aircraft that connects the mounting bases deployed at least in the front and rear locations and the mounting bases to each other. It is equipped with a main body, and a sludge scraper is supported on each mounting base so that it can rotate back and forth via a scraper shaft. A lever around the shaft is projected on the outer circumference of the scraper shaft to rotate the sludge scraper up and down. The drive means for switching and moving the aircraft back and forth has a drive source on the pond and wheels on the head side and tail side as a rotation drive system, and the conductive strips such as the link chain hung on these rotation drive systems are A sludge scraping device in which one end is interlocked with the front end of the advancing / retreating switching interlocking material that advances and retreats along the main body of the machine and the other end is interlocked with the rear portion of the advancing / retreating switching interlocking material. , The front end of the rear interlocking link is connected via the projecting piece from the advancing / retreating switching interlocking material, and the rear end is connected to the lower tip of the lever around the rear shaft projecting from the scraper shaft on the rear side. Is a sludge scraping device characterized in that the other end of the conductive strip material hung around the tail side wheel is connected so as to be in a parallel relationship with the rear interlocking link.