JP4435244B2 - Chain tooth skip prevention device in sludge scraping machine. - Google Patents

Description

  The present invention relates to a chain flight type sludge scraper provided in a settling tank of a sewage treatment plant, a water purification plant, an industrial wastewater treatment plant or the like, and when the chain moving the flight is subjected to a large tension, The present invention relates to a device for preventing chain skipping.

  In sewage treatment plants, water treatment plants, and industrial wastewater treatment plants, treated water from which dust is removed is put into a settling tank using a screen, and the precipitated sludge is removed by a flight (scraper). FIG. 3 is a schematic diagram illustrating an example of a chain flight type sludge scraper.

  In the settling tank 1, a pair of driving sprockets 3 and a plurality of driven sprockets 2 are provided. Two endless annular chains 4 are wound around these sprockets, and a plurality of flights 5 are attached over the two chains 4 at a predetermined interval.

  The pair of drive sprockets 3 are fixed to a drive shaft 3b. When the drive shaft 3b is rotated by a drive device (not shown), the two drive sprockets 3 rotate clockwise (clockwise) in the figure. The chain 4 wound around this rotates in the direction of arrow a.

  With the circumferential rotation of the chain 4, the flight 5 attached to the chain 4 also rotates in the same direction, scoops the bottom surface of the sedimentation tank 1, and the accumulated sludge enters the sludge pit formed on one side of the tank. Rake.

  FIG. 4 shows a cross section of the drive sprocket 3 and the chain 4 wound around the drive sprocket 3. The drive sprocket 3 of this example has a structure in which two disks are opposed in parallel and connected by a large number of pins, as will be described in detail later with reference to FIG. FIG. 4 shows one disk and a cross section of 10 pins. The above pins act as teeth in the gear.

  The chain 4 has a notch 4a for each frame, and the pin 3a engages with the notch 4a. When the drive shaft 3b is driven to rotate and the drive sprocket 3 is rotated in the direction of the circular arc arrow b, the chain 4 is moved around in the directions of arrows a and a.

  If a large resistance is applied to the circumferential rotation of the chain 4 for some reason, a large tension T is generated in the chain 4. When the drive sprocket 3 tries to circulate the chain 4 with a large force, a component force in the direction to lift the chain acts on the engagement portion between the notch 4a and the pin 3a as shown by an imaginary line in FIG. , So-called tooth skipping occurs.

As a technique for preventing tooth skipping, a “sludge scraper chain tooth skip prevention device” described in Patent Document 1 is known. The basic principle is schematically shown in FIG.
Two disks 3d mounted on the drive shaft 3b and facing each other in parallel are connected by a pin 3a to form a drive sprocket 3. The pin 3a engages with a notch 4a of the chain 4 to transmit a rotational force. To do. A flight 5 is attached to the chain 4.

When the chain 4 receives a large tension in the direction perpendicular to the paper surface, the chain 4 tends to float away from the pin 3a.
The tooth skip prevention device of the known invention is provided with a chain guide 7 for suppressing the lifting of the chain 4. Although the chain guide of FIG. 5 is illustrated in a simplified manner, an actual apparatus is provided with a roller for preventing friction and a spring means for reducing impact.
JP 2004-28218 A

The chain tooth skip prevention device of the sludge scraper according to the known invention shown in FIG. 5 can effectively prevent tooth skip in the chain flight type sludge scraper.
However, it is difficult to support the chain guide 7 firmly. The reason is that two chains 4 are wound around a large number of sprockets provided in the sedimentation tank 1 (see FIG. 3), and a large number of flights 5 are attached to the chains and rotate. Therefore, the marginal space for providing the chain guide support structure is narrow. In addition, a considerable amount of force is required to hold the chain with the chain guide so that the chain does not rise. If the support structure of the chain guide is weak, sufficient durability and reliability cannot be obtained.

  The present invention has been made in view of the circumstances described above. The purpose of the present invention is to strengthen a chain guide for preventing tooth skipping in a chain flight type sludge scraper with a simple and lightweight structure. It is to provide supporting technology.

  In the present invention, a chain flight type sludge scraper is applied, and a guide plate that presses down the outer surface of the chain that floats when the tooth jumps on the outer surface of the chain is supported by the drive shaft of the drive sprocket. The guide plate may be directly supported by the drive shaft, but it may be attached via a bracket so that the position can be adjusted. This can be realized with a structure in which a bearing is attached to the bracket and the drive shaft is passed therethrough. However, since the bracket rotates around the drive shaft as it is, the bracket is connected to the beam of the sedimentation tank to prevent rotation. As a result, the chain guide can be firmly supported, and a structure that tends to be brittle due to the cantilever support structure can be supported by a solid support means such as a drive shaft support.

Therefore, the chain tooth skip prevention device of the sludge scraper according to the present invention is a chain flight type in which a flight is attached to an endless annular chain wound around a driving sprocket and a driven sprocket disposed in a settling tank. In the chain tooth skip prevention device installed in the sludge scraping machine, the flange is disposed in the chain winding angle region of the outer peripheral portion of the drive sprocket, and is connected to the flange portion facing the outer peripheral surface of the chain and the drive shaft of the drive sprocket. A guide plate having an L-shaped vertical mounting substrate, and a bracket that passes through the drive shaft and is supported by a beam member of the settling tank and fixes the mounting substrate of the guide plate. This is a characteristic configuration.

Said guide plate is attached to the bracket via a position adjusting means in the radial direction of the drive sprocket, in such a manner that the permit clearance adjustment of the chain and the guide plate, In addition, the guide on the flange of the plate, the drive sprocket A pressing plate that is movable in the axial direction may be provided , and the covering allowance with the chain may be adjusted.

More specifically, in the sludge scraper according to the present invention, the chain tooth skip prevention device has a flight attached to an endless annular chain wound around a driving sprocket and a driven sprocket disposed in a settling tank. In a chain tooth skip prevention device installed in a chain flight type sludge scraper, the flange portion disposed in the chain winding angle region of the outer peripheral portion of the drive sprocket and facing the outer peripheral surface of the chain and the drive A guide plate having an L-shaped mounting substrate perpendicular to the drive shaft of the sprocket is arranged on both sides of the drive sprocket, and the flight mounting jig passes between the tip portions of the flange portions of both guide plates. The mounting plate of the guide plate is fixed, and the drive shaft is a through shaft. A bracket while lifting becomes supported by the beam member of the sedimentation tank, comprising to have a tooth skipping prevention function comprise, is characterized by.

  According to the present invention, the radial force of the drive sprocket accompanying the spring-up of the chain piece when the chain received by the guide plate is in a tooth skipping state is firmly supported by the drive shaft via the bearing means. In the present invention, the bracket with the guide plate is attached to the “beam member of the sedimentation tank”. As a result, the support member can be prevented from rotating around the drive shaft. Since the bearing means is provided on the support member on which the guide plate is mounted and the bearing means is fitted to the drive shaft, the "force in the radial direction of the drive sprocket" received by the guide plate is applied to the drive shaft via the bearing means. It is supported firmly. In this way, the guide plate can be firmly supported by using the drive shaft of the drive sprocket, which is a sturdy member inherently provided in the chain flight type sludge scraper. A small, lightweight, low-cost member is sufficient to be newly installed for application.

  Furthermore, in the configuration of the present invention, the position of the chain guide plate can be adjusted both in the sprocket radial direction and in the axial direction, so that it is easy to cope with working conditions, particularly sludge conditions.

  Hereinafter, specific embodiments of a chain tooth skip prevention device for a sludge scraper according to the present invention will be described in detail with reference to the drawings. The following embodiment is merely one aspect of the present invention, and is not limited to the embodiment as long as the technical idea is shared, and various modifications can be made.

  FIG. 1 is a perspective view of a main part schematically illustrating one embodiment of the present invention. A drive sprocket 3 having two disks 3d facing each other in parallel and coupled by a large number of pins 3a is attached to a drive shaft 3b. The drive shaft 3b is connected to a pair of drive shaft bearings 3c (one is not shown). It is supported firmly on both sides. A chain 4 (drawn in phantom lines) is wound around the drive sprocket 3 and a device 8 for preventing tooth skipping is provided.

  The tooth skip prevention device 8 according to the embodiment includes a guide plate 9 that holds the chain 4 and a guide support bifurcated bracket 10 that is a support member of the guide plate.

  The guide plate 9 receives a force that suppresses the lifting of the chain when the chain tension increases and the tooth jumps. This force acts as a force in the sprocket radial direction. Therefore, the bearing means for penetrating the drive shaft 3b to support the lifting force of the chain by the drive sprocket 3 and the guide plate 9 are free to rotate around the drive shaft. The beam member for preventing the above is configured as follows.

A guide bearing bifurcated bracket 10 which is a support member is provided with a sliding bearing 11 as a bearing means, and a drive shaft 3b is inserted therein.
In order to hold down the chain 4 so as not to cause tooth jump on the drive sprocket 3, it is necessary to apply a force toward the drive sprocket 3 against the force of separating the guide plate 9 from the drive sprocket 3. This force is represented by an arrow P, and its action line passes through the drive shaft 3b. For this reason, when the guide plate 9 receives a force in the direction of lifting from the chain 4 (counter arrow P), a force for pulling back the guide plate in the direction of arrow P against this is supported by the drive shaft 3b.

  However, the force by which the guide plate 9 is rotated in the rotation direction of the drive sprocket 3 (arc arrow b) must be supported separately from the above. Therefore, an anti-rotation material 12 is provided as a beam member. The anti-rotation material 12 is fixedly mounted in a transverse manner with respect to a sedimentation tank (not shown).

  Details of the embodiment shown in FIG. 1 will be described below with reference to FIG. The guide plate 9 is composed of plate members 9 a and 9 a having a pair of L-shaped cross sections disposed on both sides of the drive sprocket 3, and the front end flange portion 9 b of the plate member 9 a extends to the outer peripheral surface of the chain 4. At the same time, a passage clearance for the flight attachment jig is provided at the center to provide a tooth skip prevention function.

  FIG. 2A is a single perspective view of the L-shaped plate member 9a of the guide plate 9, and a reference line X indicates the center line of the drive shaft. The L-shaped plate member 9a is formed in an L shape by integrally connecting an outer flange portion 9b and a mounting substrate 9c. The mounting substrate 9c is surface-joined and fixed to the above-mentioned bifurcated bracket 10 so as to be integrated with the bracket 10, and the flange portion 9b is disposed so as to partially face the outer peripheral surface of the chain 4.

  The mounting substrate 9c has a plate shape perpendicular to the drive shaft center line X. However, even if it is not plate-like in appearance, any member that is functionally equivalent to plate-like is within the technical scope of the present invention.

  The flange portion 9b is provided with a plurality of axially elongated holes 9d parallel to the drive shaft center line X, and the mounting substrate 9c is provided with a plurality of radially elongated holes 9e in the radial direction of the drive shaft. Yes. However, the plurality of radial slots 9e are not exactly in the radial direction but are parallel to each other. The meaning will be described next. If a plurality of radial lines are written on the plate surface of the mounting substrate 9c, the plurality of lines are radial and not parallel. The plurality of long holes in the radial direction are generally a plurality of long holes parallel in the radial direction. The significance of being parallel is clarified by the effects described below.

FIG. 2B is a cross-sectional view illustrating a half portion on one side in a state where the above-described guide plate 9 is attached to the guide support bifurcated bracket 10.
A chain 4 is wound around a drive sprocket 3 fixed to the drive shaft 3b via a key K, and a sliding bearing 11 of a guide support bifurcated bracket 10 is fitted to the drive shaft 3b.

  As described above, the L-shaped plate member 9a of the guide plate 9 has an L-shape in which the flange portion 9b and the mounting board 9c are integrally connected, and the mounting board 9c has a long slot 9e in the radial direction. Is provided.

The mounting substrate 9c and the guide support bifurcated bracket 10 are fastened and fixed by bolts and nuts 13 inserted through the radial elongated holes 9e.
As is apparent from this structure, when the bolt nut 13 is loosened, the mounting position of the guide plate 9 with respect to the guide support bifurcated bracket 10 can be adjusted in the vertical direction in the figure. By this position adjustment, the distance between the flange portion 9b and the chain 4 can be increased or decreased.

  Similarly, a holding plate 9f is attached so that the attachment position can be adjusted in the axial direction of the drive shaft by a bolt and nut 13 inserted through an axially long hole 9d provided in the flange portion 9b.

  In FIG. 2B, only one set of bolt nuts 13 and one radial slot 9e appear, but a plurality of sets of bolt nuts and a plurality of radial slots 9e If the state where the plurality of radial slots 9e are parallel to each other, it is understood that the position of the guide plate 9 cannot be adjusted up and down.

  According to the chain tooth skip prevention device of the sludge scraper configured as described above, when the tension acting on the chain 4 in the direction opposite to the driving direction is applied, the chain 4 piece of the chain 4 is wound around the driving sprocket 3. A force that causes the tip portion to spring up acts (see the imaginary line in FIG. 4), and tooth skipping tends to occur. However, the chain guide plate 9 restricts the jumping up, and tooth skipping is prevented. The force accompanying chain tooth jump at this time is supported by the drive shaft 3b of the drive sprocket 3 via the guide support bifurcated bracket 10. Since this acting force is not transmitted to the anti-rotation member 12 which is a beam member passing over the settling tank, the strength of the beam member itself may be small. Therefore, the chain guide for preventing tooth skipping in the chain flight type sludge scraper can be configured to be firmly supported by a simple and lightweight configuration.

It is a typical external appearance perspective view which shows one Embodiment of the tooth-splash prevention apparatus of the drive sprocket in the sludge scraper which concerns on this invention. The guide plate in the said embodiment is shown, (A) is an external appearance perspective view of an L-shaped plate member, (B) is sectional drawing of an assembly state. It is the schematic diagram which drew the outline | summary of the chain flight type sludge scraper used as the application object of this invention. It is a schematic diagram which shows the relationship between the drive sprocket and a chain in the said sludge scraper. It is typical sectional drawing for demonstrating the principle of the tooth skip prevention apparatus which concerns on a well-known invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ......... Settling tank, 2 ......... Drive sprocket, 3 ......... Drive sprocket, 3a ......... Pin, 3b ......... Drive shaft, 4 ......... Endless annular chain, 4a ......... Notch, 5 ......... Flight (scraping plate), 7 ......... Chain guide, 8 ......... Tooth skip prevention device, 9 ......... Guide plate, 9a ......... L-shaped part rate member, 9b ......... Flange part , 9c ......... Mounting substrate, 9d ......... Axis direction long hole, 9e ......... Radial direction long hole, 9f ......... Pressure plate, 10 ......... Guide support bifurcated bracket, 11 ......... Bearing Slidable bearings, 12... Anti-rotation material as beam members, 13 ...... Bolts and nuts.

Claims (4)

In the chain tooth skip prevention device installed in the chain flight type sludge scraping machine in which the flight is attached to the endless annular chain wound around the driving sprocket and the driven sprocket arranged in the settling tank,
A guide plate configured in an L shape with a flange portion disposed in a chain winding angle region of the outer peripheral portion of the drive sprocket and facing the outer peripheral surface of the chain and a mounting substrate perpendicular to the drive shaft of the drive sprocket;
A bracket that supports the drive shaft through the shaft and is supported by the beam member of the settling tank, and fixes the mounting substrate of the guide plate;
A device for preventing chain tooth skipping of a sludge scraper.   2. The sludge scraper chain according to claim 1, wherein the guide plate is attached to the bracket via a position adjusting means in a radial direction of the drive sprocket, and the gap between the chain and the guide plate can be adjusted. Tooth skip prevention device. The sludge according to claim 1 or 2, wherein the flange portion of the guide plate is provided with a pressing plate that is movable in the axial direction of the drive sprocket, and the covering allowance with the chain can be adjusted. Scratching machine chain tooth skip prevention device. In the chain tooth skip prevention device installed in the chain flight type sludge scraping machine in which the flight is attached to the endless annular chain wound around the driving sprocket and the driven sprocket arranged in the settling tank,
The drive sprocket includes a guide plate configured in an L shape with a flange portion disposed in a chain winding angle region of the outer peripheral portion of the drive sprocket and facing a chain outer peripheral surface and a mounting substrate perpendicular to the drive shaft of the drive sprocket. Are arranged on both sides of the guide plate and provided with a passing clearance of the flight mounting jig between the front end portions of the flange portions of both guide plates,
A bracket that is supported by the beam member of the settling tank while the mounting substrate of the guide plate is fixed, and the drive shaft is supported by a through shaft,
With a tooth skip prevention function,
An apparatus for preventing chain tooth skipping in a sludge scraper.

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