JPH0970502A - Guide rail for sludge scraper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide rail for a sludge scraper which is capable of surely maintaining a detaining function in correspondence to the creep deformation in transverse direction of a secondary rail and the expansion and shrinkage in the longitudinal direction of this rail and is consequently improved in the scraping efficiency of sludge by stably guiding a flight plate even if a temp. change arises. SOLUTION: A projecting part 2b for engagement projectingly disposed on the rear surface of the secondary rail 2 made of a synthetic resin is fitted into an engaging groove 1a disposed in the longitudinal direction of the upper surface of a primary rail 1 made of the synthetic resin, by which the guide rail detained with the secondary rail 2 movably in the longitudinal direction of the primary rail 1 is constituted. As a result, the flight plate is stably guided without the occurrence of waving, dislodgment, etc., even if the elongation and contraction or creep deformation by the temp. change occur at the secondary rail 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge attracting machine for attracting sludge accumulated in a sedimentation basin of a sewage treatment plant or a water purification plant to a predetermined location, and particularly a sludge attractor for guiding a flight board for attracting sludge. Regarding machine rails.

[0002]

2. Description of the Related Art A chain flight type (link belt type) sludge attractor is generally widely used as a sludge attractor for attracting sludge deposited in a sedimentation basin such as a sewage treatment plant.
In these sludge attractors, a flight plate (F) is attached to two endless chains (C) that circulate up and down in a sedimentation pond (P), as schematically shown in (a) of Fig. 4. By installing the flight plates (F) at approximately equal intervals and circulating the flight plates (F) together with the endless chain (C), the sludge accumulated at the bottom of the sedimentation basin (P) is continuously scraped to the sludge pool (P1). It is said that. In addition, the flight board (F) that draws in the sludge is a shoe (F) attached to both ends as shown in (b) which is a sectional view taken along the line AA in (a).
1) is a pair of guide rails laid at the bottom of the sedimentation pond (P)
The running is stabilized by being slidably contacted and guided by (L).

By the way, in these sludge scrapers,
Usually, the guide rail and the shoe of the flight plate, etc. were made of a metal material such as carbon steel or cast iron, so the mutual frictional resistance is large and the abrasion due to sliding friction easily occurs, and moreover, it contains a lot of mud, sand, etc. Due to the presence of sludge, there is a problem that wear is further promoted, corrosion due to dirty water is added, and the guide rails and shoes are damaged.
If the guide rails or shoes of the flight board are worn out, the sedimentation basin must be emptied and the guide rails and shoes must be repaired or replaced, which requires a great deal of labor and days, and sewage treatment is delayed. It will be.

Therefore, various attempts have been made to reduce such problems. For example, a synthetic resin plate with excellent surface smoothness is secured to the sliding contact surface of the guide rail and flight plate with bolts, etc. to suppress mutual frictional resistance and wear to a low level and prevent corrosion. 967
No.), and as shown in (a) and (b) of FIG. 3, the upper surface of the guide rail (L), which is the sliding contact surface, is made of synthetic resin with a U-shaped cross section. The guide rail (removable rail (R) or cover (C) is removably attached and locked to suppress wear due to sliding, prevent corrosion, and facilitate replacement during wear (actual flat 2 -45107, 2-57108, JP-A-2-191510, etc.), and while the guide rail (L ') is made entirely of synthetic resin to increase durability, as shown in (c), this guide rail (L') A plurality of notches (L2) are formed on both sides of (L '), and one end of the holding plate (B) fixed to the pond bottom is fitted and fixed in each notch (L2), and the notches (L2) For example, the length of L2) and the width of the holding plate (B) are set so as to have a gap in the length direction of the guide rail (L ') to absorb the expansion and contraction.

[0005]

However, in a conventional guide rail in which a synthetic resin replacement rail or a cover is attached and locked to a rail main body made of metal such as steel, the wear caused by sliding can be suppressed to a low level. Although the advantages of being able to prevent corrosion and being easy to replace at the time of abrasion can be obtained, the following problems are caused because the linear expansion coefficient of synthetic resin is larger than that of metal materials. That is, when there is a large temperature change after installation, due to the difference in the amount of expansion and contraction with the rail body, the fixed or locked replacement rail or cover is wavy, and if it becomes severe, for example, fixing means such as bolts. There is a risk that the area around the fixed part will be damaged if it is fixed with, and the area around the locking part will be damaged if it is locked with locking claws so as not to move in the longitudinal direction, and will eventually fall off the rail body. There is. Further, as shown in (b) of FIG. 3, the side surface portion (C1) is made relatively thin, and the side surface portion (C1) is
If the cover (C) with the bent portion (C2) at the lower end is expanded to the outside of the bent portion (C2) and fitted to the head of the rail body (L1), expansion in the longitudinal direction Although it can handle contraction,
Due to the large creep deformation as a characteristic of synthetic resin,
Only by sandwiching by the bent parts (C2) on both sides, the reliable locking effect cannot be maintained for a long period of time, and the creeping function deteriorates due to creep deformation in the width direction, causing rattling, and finally falling off from the rail body. There is a risk of doing it. Here, as shown in (a) of FIG. 3, in a replacement rail (R) having a U-shaped cross section, for example, the locking claws (R1) at both lower ends of the replacement rail (R1) are If it engages deeply with (L1) and is attached to the rail body (L1) so as to be movable in the longitudinal direction, the locking function can be maintained in response to creep deformation in the width direction and expansion / contraction in the longitudinal direction. However, in the replacement rail having such a cross-sectional shape, the volume ratio of the locking portion to the sliding portion that performs the original function becomes large, and the manufacturing cost thereof becomes unnecessarily high.

On the other hand, in the case of a guide rail in which the entire guide rail is made of synthetic resin, the above-mentioned problems can be avoided, but since the guide rail is fixed, the wear allowance of the guide rail is the upper surface thereof. Since there is only a part from the top to the top of the holding plate, it is necessary to increase the total thickness in order to set the wear allowance sufficiently, but it is technically difficult to manufacture thick and long synthetic resin. Is relatively difficult and the manufacturing cost is high. Further, in order to absorb the expansion and contraction in the longitudinal direction by the length of the cutout portion, it is necessary to take an appropriate span between the cutout portions, and in a relatively long guide rail, the number of holding plates is increased. Fixing becomes complicated. Further, in order to fix the guide rails by a large number of holding plates so that they can be freely expanded and contracted, it is necessary to enhance the finishing accuracy of the civil engineering work for mounting the guide rails, the holding plate mounting accuracy, etc. Becomes complicated.

The present invention is intended to solve the above-mentioned problems of the prior art, and is constructed by mounting a secondary rail made of synthetic resin on a primary rail made of steel or the like that can be easily fixed to a sedimentation basin. As workability and wear resistance / corrosion resistance are improved, the locking function can be reliably maintained in response to creep deformation in the width direction of the secondary rail and expansion / contraction in the longitudinal direction, resulting in temperature changes. It is an object of the present invention to provide a guide rail for a sludge scraper that can guide the flight plate stably and improve the sludge scraping efficiency.

[0008]

In order to achieve the above object, the present invention has the following constitution. That is, the guide rail for a sludge scraper according to the present invention is a guide rail for a sludge scraper, which guides the travel by slidingly contacting a flight plate that circulates in a sedimentation basin and draws in sludge. A primary rail fixed to the pond and a secondary rail made of synthetic resin mounted on the upper surface of the primary rail and slidingly contacting the flight plate are provided, and the primary rail is made of a synthetic resin material of the secondary rail. Is also made of a material having a low coefficient of linear expansion, and a longitudinal engaging groove is provided on the upper surface thereof, while 2
It is characterized in that the secondary rail is engaged with the engaging groove of the primary rail so as to be fitted in the engaging groove of the secondary rail so as to be movably locked in the longitudinal direction of the primary rail.

Further, the engaging groove of the primary rail is formed in a modified cross-sectional shape in which the inner bottom portion has a larger diameter than the upper end edge portion of the opening, while the engaging protrusion of the secondary rail has a base end portion. It may be formed to have a modified cross-sectional shape in which the diameter of the front end portion is expanded and fitted into the engagement groove of the primary rail, and the shape may be continuously or intermittently provided in the longitudinal direction. Also, the above primary rail is
It may be made of a steel material, or may be made of an extrusion molded body of a fiber reinforced resin.

In the sludge scraper guide rail of the present invention, the engaging protrusion of the secondary rail moves in the longitudinal direction within the engaging groove of the primary rail, so that the primary rail and the secondary rail due to temperature change are By absorbing the difference in the amount of expansion and contraction of the secondary rails in the longitudinal direction, it is possible to prevent the secondary rails made of synthetic resin having a large linear expansion coefficient from corrugating, and the mutual locking portions are
By arranging between the upper surface of the secondary rail and the lower surface of the secondary rail, the locking function can be maintained even if creep deformation occurs in the secondary rail in the width direction, and therefore, even when the temperature changes, the secondary rail wavy. It is possible to stably guide the flight plate for a long period of time without causing any dropout or the like. Further, as a result, the primary rail is made of a steel material or the like having a linear expansion coefficient lower than that of the synthetic resin material of the secondary rail and easily fixed to the sedimentation basin, thereby facilitating its construction. be able to.

Further, the engaging groove of the primary rail is formed in a modified cross-sectional shape in which the inner bottom portion has a diameter larger than that of the upper end edge portion of the opening, while the engaging protrusion portion of the secondary rail is forward of the base end portion. By expanding the diameter of the portion to form a modified cross-sectional shape that fits in the engagement groove of the primary rail, the engagement projection can be moved in the longitudinal direction within the engagement groove of the primary rail, and can still be removed. It can be locked so that it does not move. Further, the engagement with the primary rail can be achieved not by the both sides as in the above-mentioned prior art but by the engagement projections provided continuously or intermittently in the longitudinal direction on the lower surface of the secondary rail. The volume ratio of the part can be remarkably reduced, and even if the wear margin of the secondary rail is sufficiently secured and the service life is extended, the manufacturing cost can be kept low. Furthermore, since the primary rail is made of an extruded product of fiber reinforced resin, the engaging groove of the primary rail does not need to be machined, the manufacturing cost can be reduced, and its corrosion resistance can be improved. It can be improved to extend the service life.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a drawing showing the constitution of one embodiment of the guide rail of the present invention, wherein (a) is a perspective view showing the overall constitution, (b) is a perspective view showing the constitution of the primary rail, (c) is a perspective view showing the structure of the secondary rail.

The guide rail of this embodiment shown in FIG. 1 is a primary rail (1) made of a steel rail used for a light track, and a composite rail mounted on the upper surface of the primary rail (1). It is composed of a secondary rail (2) made of resin.

The primary rail (1) is provided with a longitudinal engaging groove (1a) at the center of its upper surface as shown in FIG. 2 (b), and the engaging groove (1a) is It is formed in a polygonal irregular cross-sectional shape in which the diameter is expanded from the upper edge portion in which the bottom portion is opened in parallel.

On the other hand, the secondary rail (2) is, as shown in FIG. 2 (c), formed into a flat plate with the main body (2a) having substantially the same width as the upper surface of the primary rail (1), and in the center of the lower surface. It is formed by extrusion molding in a long shape with a cross-sectional shape provided with an engaging protrusion (2b), and the engaging protrusion (2b) has a diameter increased from that of a base end portion in which the tips are formed in parallel. As an inverted trapezoid, it has an irregular cross-sectional shape that fits in the engagement groove (1a) of the primary rail (1). The secondary rail (2) is made of synthetic resin such as cast nylon, ultra high molecular weight polyethylene, polyacetal, etc., which has a small friction coefficient and is excellent in wear resistance.

The secondary rail (2) has an engaging projection (2b) projecting over the entire length in the longitudinal direction of the lower surface of the primary rail (1).
It is fitted into the engaging groove (1a) of FIG. 1 and is locked to the primary rail (1) to be integrally assembled as shown in FIG. Further, a clearance is provided between the engaging projection (2b) and the engaging groove (1a), and when an external force in the longitudinal direction that exerts bending deformation on the secondary rail (2) is applied, the engagement is generated. The collision portion (2b) is moved in the longitudinal direction within the engagement groove (1a) so that the deformation of the secondary rail (2) can be eliminated.

The guide rail of this embodiment has the structure shown in FIG.
Similar to the guide rail (L) shown in Fig. 2, it is laid in pairs at the bottom of the sedimentation pond (P), and its secondary rail (2) is the flight board.
Guide the run by sliding on the shoe (F1) of (F). Further, the primary rail (1) is fixed to the sedimentation pond (P) by a fixing means applied to general rail laying.

Here, in the guide rail of this embodiment, 2
Since the engaging protrusion of the secondary rail can move in the longitudinal direction in the engaging groove of the primary rail, the difference in expansion and contraction amount in the longitudinal direction of the primary rail and the secondary rail due to temperature change is absorbed, and the linear expansion coefficient It is possible to prevent corrugation from occurring on the large secondary rail made of synthetic resin. In addition, the engaging portion between the primary rail and the secondary rail is not a sandwiching lock from both sides as in the conventional case, but a deformed cross-section that is fitted to each other in the central portion of the facing surface and is difficult to be disengaged upward. Since it has a shape, the locking function can be maintained even if the secondary rail undergoes creep deformation in the width direction, so that even if the temperature changes, the secondary rail does not wrinkle or fall off, and the flight plate Can guide stably for a long period of time. Further, since the volume ratio of the engaging protrusion of the secondary rail is low due to its structure, the manufacturing cost can be kept low even if the wear allowance is sufficiently secured in order to extend the service life. Furthermore, if a sufficient expansion / contraction margin is secured at the end of the guide rail, it is not necessary to strictly predict the amount of expansion / contraction in the longitudinal direction of the secondary rail due to temperature changes. It is not necessary to arrange them in consideration of the distance between them, and it is possible to make the length longer, which reduces vibrations when guiding the flight plate and improves sludge scraping efficiency. Since the primary rail fixed to the sedimentation basin is made of steel having a relatively low coefficient of linear expansion, the number of fixing tools is small and the construction is simple.

In the above-mentioned embodiment, the secondary rail is formed by integrally forming the engaging projections on the lower surface by extrusion molding over the entire length in the longitudinal direction. As long as you can secure the engagement of
As shown in FIG. 2 (a), the engaging protrusions (2b ') may be provided intermittently in the longitudinal direction. Further, in this case, as shown in the same figure (b), the engaging protrusions (2b ')
It is also possible that the notch (2c) is provided on the tip end surface of the rail, and the engaging projection (2b ') is pushed into the engaging groove (1a) of the primary rail (1) from the opening to engage with it. This is a preferred embodiment because the next rail (2) can be easily mounted. Further, these engaging protrusions are not formed integrally with the main body portion (2a) of the secondary rail (2), but are made of the same kind or different kinds of synthetic resin that are separately formed. As shown in the figure (d), a square clip-shaped locking tool (3) fitted into the groove (2d) provided around the main body (2a) of the secondary rail (2). Alternatively, it may be a tack-like locking tool (4) which is fixed and planted in a fitting hole (2e) provided in the main body (2a) of the secondary rail (2).

Further, in the above embodiment, an example in which a rail for a light rail is used as the primary rail has been described. However, this primary rail has a lower linear expansion coefficient than the synthetic resin material and is fixed to the sedimentation basin. In addition to steel rails for light rails, various shapes of steel materials such as I-shaped steel and square materials, cast iron materials and the like can be applied as long as they are easy.

Further, the primary rail is extrusion-molded with a fiber reinforced resin to have a rail-shaped cross section as shown in FIG. 2 (e), and its upper surface has the same modified cross section as described above. By using a molded body provided with a shaped engaging groove, machining of the engaging groove (1a ') of the primary rail (1') becomes unnecessary, and the manufacturing cost can be reduced and Corrosion resistance can be improved to extend the service life.

[0022]

As described above, in the guide rail for a sludge attractor according to the present invention, a secondary rail made of synthetic resin is attached to a primary rail made of steel or the like that can be easily fixed to a sedimentation basin. As a result, the workability and wear / corrosion resistance are improved, and the locking function can be reliably maintained in response to creep deformation in the width direction of the secondary rail and expansion / contraction in the longitudinal direction. Even if the temperature changes, the flight plate can be guided stably to improve the sludge scraping efficiency, and the volume ratio of the engaging protrusion of the secondary rail that locks to the primary rail can be kept small. It is possible to obtain an excellent effect that the manufacturing cost can be reduced.

[Brief description of drawings]

1A and 1B are drawings showing a configuration of one embodiment of a guide rail of the present invention, wherein FIG. 1A is a perspective view showing the overall configuration, and FIG. 1B is a perspective view showing the configuration of a primary rail; c) The figure is a perspective view showing the structure of the secondary rail.

FIG. 2 is an explanatory diagram of a main part configuration in another embodiment of the guide rail of the present invention.

FIG. 3 is a view showing a configuration of a conventional guide rail.

FIG. 4 is a schematic view showing a configuration arrangement of a chain flight type sludge scraper.

[Explanation of symbols] (1) --Primary rail (1a)-Engagement groove (2) --Secondary rail (2a)-Main body (2b)-Engagement protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiko Taniguchi 1-3-18 Wakihamacho, Chuo-ku, Kobe-shi, Hyogo Kobe Steel Works, Ltd. Kobe Head Office

Claims (4)

[Claims] 1. A guide rail for a sludge scraper that slidably contacts a flight plate that circulates in a sedimentation basin and attracts sludge, and a primary rail fixed to the sedimentation basin, A secondary rail made of synthetic resin which is mounted on the upper surface of the primary rail and slidably contacts the flight plate, and the primary rail is made of a material having a linear expansion coefficient lower than that of the synthetic resin material of the secondary rail. , The upper surface of which is provided with a longitudinal engaging groove, while the engaging protrusion of the secondary rail protruding from the lower surface thereof is fitted into the engaging groove of the primary rail so that A guide rail for a sludge attractor characterized by being locked so that it can move in any direction. 2. The engaging groove of the primary rail is formed in a modified cross-sectional shape in which the inner bottom portion is wider than the upper end edge portion of the opening, while the engaging protrusion of the secondary rail is formed from the base end portion. The sludge scraper according to claim 1, wherein the slender scraper is formed so as to have a modified cross-sectional shape in which the tip portion is expanded in diameter and fits into the engagement groove of the primary rail, and is continuously or intermittently provided in the longitudinal direction. Guide rails. 3. The rail for a sludge attractor according to claim 1, wherein the primary rail is made of steel. 4. The sludge scraper rail according to claim 1 or 2, wherein the primary rail is formed of a fiber-reinforced resin extruded product.