JP2018179300A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device in which a ring is hardly released even if sloshing occurs, and countermeasures are applied to suppress increase in manufacturing costs and increase in load for a driving device caused by increase in weight of a chain.SOLUTION: A chain 8 is disposed between a pair of link plates 81 opposed to each other at an interval, and includes a barrel portion 82 connecting the pair of link plates 81, a boss portion 83 projecting to a side opposite to the side of the pair of link plates 81 opposed to each other, and a stay 86 disposed in a circumferential direction of the chain 8 at an interval to the boss portion 83, and having an extension portion extended to an opposite side from the pair of link plates 81. A sprocket 5 has an engagement tooth 521 projecting to a radiating direction of the sprocket 5 at a central part in a thickness direction of the sprocket 5 ane engaged with the barrel portion 82, and an inhibitor tooth 531 projecting to the radiating direction while avoiding the barrel portion 82 and the extension portion at an outer side in the thickness direction with respect to the link plate 81, in a state that the engagement tooth 521 is engaged with the barrel portion 82.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a power transmission device including a chain in which a pair of link plates facing each other at intervals are connected in a circumferential direction and a rotating wheel around which the chain is wound.

  A power transmission device is known that includes a chain and a rotating wheel around which the chain is wound, and transmits power applied to the rotating wheel. This power transmission device is used, for example, in a sludge collector. The sludge collector is provided in a sedimentation basin where sludge contained in received water is deposited in the bottom of the pond, and sludge deposited in the bottom of the pond is scraped by a flight plate to which power is transmitted from the power transmission device . The chain is wound around a plurality of rotating wheels such as driven sprockets and driven sheaves, and travels on an orbit connecting the rotating wheels. That is, the chain provided in the sludge collector travels on a circumferential track in which a scraping track extending along the bottom of the sedimentation tank and a water surface track extending to the water surface are connected. As the chain travels along the orbit, the flight plate provided on the chain scrapes sludge deposited on the bottom of the sedimentation tank when traveling on the bottom of the pond, and scum floats on the water surface when traveling on the water surface Ru.

  By the way, when an earthquake occurs, sloshing occurs in which water near the water surface in the sedimentation tank is greatly ruffled by shaking due to the earthquake. When this sloshing occurs, particularly the water surface track portion shakes a lot and the force of the swing is transmitted to the chain wound around the rotating wheel located on the water surface side, so that the portion of the chain wound around the rotating wheel is the rotating wheel You may miss your wheel. For this reason, there has been proposed a power transmission device designed to prevent the chain from coming off the rotating wheel when sloshing occurs (see, for example, Patent Document 1). The chain of the power transmission device described in Patent Document 1 includes a link member and a connection pin, and the link member is connected in the circumferential direction by the connection pin. The link member is one in which a pair of link plates facing each other are connected by a barrel portion. The link plate is provided with a projecting plate portion extending in parallel with the radial direction of the rotating wheel. As a result, sloshing occurs, and even if the portion of the chain wound around the rotating wheel swings, the chain may be disengaged from the rotating wheel by bringing the protruding plate portion into contact with the rotating wheel. I'm trying to suppress.

JP, 2013-194794, A

  However, since the power transmission device described in Patent Document 1 is provided with the protruding plate portion on the link plate of the chain, compared to a power transmission device provided with a chain having a conventional structure without the protruding plate portion, While the manufacturing cost increases, the weight on the chain also increases the load on the drive. These problems increase as the number of link plates increases, and particularly when the number of link plates is large and the perimeter length is long, the manufacturing cost of the power transmission device is significantly increased. A significant increase in the load on the drive is inevitable.

  In view of the above circumstances, it is an object of the present invention to provide a power transmission device in which it is difficult to disengage from the wheel even if sloshing occurs, and a device for suppressing an increase in load on a drive device due to an increase in manufacturing cost and an increase in chain weight. To aim.

A power transmission device according to the present invention which solves the above object is a power transmission device having a rotating wheel and a chain partially wound around the rotating wheel,
The chain is
An engaged portion which is provided between a pair of link plates facing each other at intervals and which connects the pair of link plates;
A boss portion projecting on the side opposite to the side where the pair of link plates face each other;
And a stay which is disposed at an interval from the boss portion in the circumferential direction of the chain and has an extension portion extending from the pair of link plates to the opposite side,
The rotating wheel is
An engagement tooth which protrudes in the radial direction of the rotating wheel at a central portion in the thickness direction of the rotating wheel and engages with the engaged portion;
In the state in which the engagement tooth is engaged with the engaged portion, the radially outer side with respect to the link plate has the stop tooth protruding in the radial direction, avoiding the boss and the extension. It is characterized by

  Here, the stop teeth may protrude in the radial direction more than the engagement teeth.

  According to the present invention, it is possible to provide a power transmission device in which it is difficult to derail even if sloshing occurs, and a device for suppressing an increase in load on a drive device due to an increase in manufacturing cost and an increase in chain weight.

It is a top view which shows an example which installed the sludge collector provided with the power transmission device which is one Embodiment of this invention in the sedimentation basin. It is the figure which showed typically the AA cross section of FIG. (A) is the figure which looked at a part of chain shown in FIG. 2 from the upper direction, (b) is the figure which looked at a part of chain shown to (a) from the side. (A) is the figure which looked at the sprocket shown in FIG. 2 from the pond width direction, (b) is BB sectional drawing of the sprocket shown to (a). (A) is a perspective view which shows typically a mode that a part of chain was wound on the drive sprocket shown in FIG. 2, (b) is the schematic diagram which looked at (a) from upper direction. It is CC sectional drawing of FIG.5 (b). It is a figure which shows the aspect corresponding to FIG. 6 in the 1st modification of this embodiment. (A) is a figure which shows the aspect corresponding to FIG.5 (b) in the 2nd modification of this embodiment, (b) is DD sectional drawing of (a). It is sectional drawing which shows the aspect which has arrange | positioned the sludge collector provided with the power transmission device which is 2nd Embodiment of this invention on the accumulation groove of a sedimentation basin.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1: is a top view which shows an example which installed the sludge collector provided with the power transmission device which is one Embodiment of this invention in the sedimentation basin. Moreover, FIG. 2 is the figure which showed typically the AA cross section of FIG. In addition, in FIG. 1, the sludge collector 3 shown in FIG. 2 is abbreviate | omitted.

  The sedimentation basin 1 shown in FIG. 1 is a rectangular pond extending in a predetermined direction (left to right in FIG. 1), and from one end side (left in FIG. 1) in the extending direction, sewage such as sewage or rain water The sludge contained in the received and received sewage is deposited on the pond bottom 1 d and drained from the other end side (right side in FIG. 1). Hereinafter, the left direction in FIG. 1 may be referred to as an upstream direction, and the right direction in FIG. 1 may be referred to as a downstream direction. Moreover, the up-down direction in FIG. 1 may be called the pond width direction.

  As shown in FIG. 1, the sedimentation basin 1 is a pond having a substantially rectangular shape in a plan view surrounded by a pair of side walls 1a provided on both sides in the pond width direction, an upstream wall 1b and a downstream wall 1c. .

  As shown in FIG. 2, the settling basin 1 is provided with a scum removing device 10, a sludge collector 3, a drainage weir 41, and a sludge pit 42. The drainage weir 41 is provided on the downstream side of the sedimentation tank 1, and the sludge pit 42 is provided on the upstream side of the sedimentation tank 1.

  The sludge collector 3 is provided at each end of the sedimentation basin 1 in the width direction of the sedimentation basin 1, and a pair of chains 8 traveling in the sedimentation basin 1 and a plurality of flight plates 9 bridged between the pair of chains 8. Is equipped. The chain 8 is an annular one forming a circular track in which a track along the pond bottom 1 d and a track along the water surface W are connected. The flight plate 9 is attached to the annular chain 8 at equal intervals in the circumferential direction over the entire circumference. In FIG. 2, the chain 8 is shown by the above-mentioned orbit. A detailed description of the chain 8 will be described later. Hereinafter, the direction in which the chain 8 travels clockwise in the circumferential direction (the direction indicated by the arrow in FIG. 2) may be referred to as the circumferential direction.

  Sprockets 5 and 6 as an example of the rotating wheel according to the present invention are disposed near the upstream end and the downstream end of the track along the water surface W, and these sprockets 5 and 6 have the water surface according to the present invention. It corresponds to an example of a side rotation wheel. In addition, the sheave wheels 71 and 72 are disposed near the downstream end and the upstream end of the track along the pond bottom 1 d. The sheave wheels 71 and 72 are located below the sprockets 5 and 6, and correspond to an example of the lower rotating wheel in the present invention. The sprockets 5 and 6 and the sheave wheels 71 and 72 are disposed inside the orbit, and a part of the chain 8 is wound around. Further, the sprockets 5 and 6 and the sheave wheels 71 and 72 are provided at both ends in the lateral direction of the pond. The portions of the chain 8 wound around the sprockets 5 and 6 are engaged with the sprockets 5 and 6. Note that, instead of the sprocket 6, a sheave wheel may be disposed, and instead of the sheave wheels 71 and 72, a sprocket may be disposed.

  A drive shaft 55 is non-rotatably fixed to a central portion of the sprocket 5, and the sprocket 5 is also rotated by rotation of the drive shaft 55 by a motor (not shown). That is, the sprocket 5 is a drive wheel for transmitting the driving force of a motor (not shown) and causing the chain 8 to travel. In the following description, the sprocket 5 may be referred to as a drive sprocket 5. The drive sprocket 5 shown in FIG. 2 is rotationally driven clockwise, and the chain 8 also travels clockwise. On the other hand, the sprocket 6 and the sheave wheels 71 and 72 are driven wheels that rotate as the chain 8 travels. Fixed shafts 65, 75, and 75 pass through the driven sprocket 6 and the central portions of the driven sheaves 71, 72, respectively. The sprocket 6 and the sheave wheels 71, 72 are all rotatable with respect to their fixed shafts 65, 75, 75, and the respective shafts 65, 75, 75 are fixedly arranged non-rotatably around the shafts. In the following description, the sprocket 6 may be referred to as a driven sprocket 6. A detailed description of the structure of the sprockets 5 and 6 will be described later.

  As the drive shaft 55 rotates, the drive sprocket 5 rotates and the chain 8 travels. When the chain 8 travels, the flight plate 9 travels along the track along the pond bottom 1 d from the downstream side to the upstream side, and the sludge deposited in the pond bottom 1 d is scraped by the flight plate 9 into the upstream sludge pit 42 Be The power transmission device 31 of the present embodiment includes the drive sprocket 5 and the chain 8, and also includes the driven sprocket 6 and the sheave wheels 71 and 72. The sludge scraped into the sludge pit 42 is discharged to the outside of the sedimentation tank 1 by a sludge pump (not shown).

  The scum removing device 10 includes a weir 11, a trough 12, and a scum pit 16 (see FIG. 1). The trough 12 is fixed at a predetermined height position from the pond bottom 1 d. The trough 12 extends across the sedimentation basin 1 in the pond width direction to a scum pit 16 (see FIG. 1) provided outside the sedimentation basin 1. A predetermined water level higher than the upper edge of the upstream wall 121 extending in the pond width direction of the trough 12 shown in FIG. 2 is the lowest water level of the sedimentation basin 1. The crucible 11 is connected to the trough 12 by the connecting member 13 so as to be rotatable about the lower end with respect to the trough 12. The weir 11 is for holding and swallowing scum that floats on the water surface, and it is between the wedging state where the upper end is located above the water surface W and the sunk state where the upper stage is submerged in water It changes state. The weir 11 shown in FIG. 2 is in the blocking state. When the upper end of the wedge 11 in the blocking state is pushed down by a drive mechanism (not shown), the wedge 11 pivots with the lower end as a rotation center, and is in a depressed state. The weir 11 prevents the water in the sedimentation tank 1 from flowing into the trough 12 in the stagnation state, whereas the water in the sedimentation tank 1 flows into the trough 12 in the stagnation state.

  A scum floats on the water surface W of the sedimentation basin 1. When the chain 8 travels, the flight plate 9 travels along a track along the water surface W from the upstream side to the downstream side, and the scum floating on the water surface W of the sedimentation tank 1 is transferred by the flight plate 9 toward the weir 11 Be done. Here too, the driving force of the motor (not shown) is transmitted to the flight plate 9 by the drive sprocket 5 and the chain 8. The scum flows into the trough 12 over the upper end of the weir 11 together with the water in the sedimentation basin 1 when the weir enters the state after a certain time has passed. The bottom of the trough 12 slopes downward toward the scum pit 16 outside the sedimentation basin 1, and the scum mixed water mixed with scum passes through the trough 12 to reach the scum pit 16 shown in FIG. 1. The scum pit 16 is provided with a pump 161. The pump 161 pumps up scum mixed water accumulated in the scum pit 16. The water in the sedimentation basin 1 flows under the trough 12 from the drainage weir 41 to a drainage channel (not shown) and is drained to the outside of the sedimentation basin 1.

  Subsequently, an example of the chain will be described.

  Fig.3 (a) is the figure which looked at a part of chain shown in FIG. 2 from the upper direction, and the figure (b) is the figure which looked at a part of chain shown in the same figure (a) from the side. is there. In FIG. 3, the direction from left to right in the figure is the circumferential direction, and the chain 8 travels from left to right in the figure. Further, in FIG. 3A, the vertical direction of the drawing is the pond width direction, and in FIG. 3B, the direction orthogonal to the paper surface is the pond width direction.

  The chain 8 has a link member 80 and a connection pin 85, and is formed by connecting the link member 80 in the circumferential direction by the connection pin 85. The link member 80 is made of, for example, synthetic resin, and the connection pin 85 is made of, for example, synthetic resin or metal. The link member 80 is formed by connecting a pair of link plates 81 facing each other at intervals in the pond width direction by the barrel portion 82. The barrel portion 82 is provided on the upstream side of the pair of link plates 81 facing each other in the circumferential direction. Further, on the downstream side of each of the pair of link plates 81 in the circumferential direction, a boss 83 projecting outward in the pond width direction is provided. The link member 80 has a first insertion hole 81a penetrating the pair of link plates 81 and the barrel portion 82 in the pond width direction, and a second insertion hole penetrating the pair of link plates 81 and the boss portion 83 in the pond width direction. It has 81b.

  The connecting pin 85 has a shaft portion 851 extending in the pond width direction, and a head portion 852 provided on one end side of the shaft portion 851 and larger than the diameters of the first insertion hole 81a and the second insertion hole 81b. . The shaft portion 851 is passed through the first insertion hole 81 a of the link member 80 and the second insertion hole 81 b of another link member 80 connected to the link member 80. The head 852 of the connecting pin 85 abuts on one of the bosses 83, and the other end portion of the shaft 851 protrudes outward from the other boss 83. A locking ring 853 and a locking prevention pin 854 are disposed at a portion of the shaft portion 851 that protrudes from the boss portion 83. The locking ring 853 locks the end of the shaft 851 at the other end. The retaining pin 854 is a horseshoe having a diameter substantially the same as the diameter of the shaft 851, is disposed between the boss 83 and the locking ring 853, and regulates the position of the connecting pin 85 in the extending direction. doing. Further, the locking pin 854 also functions as a locking pin that restricts the connection pin 85 from rotating relative to the link member 80. The locking ring 853, the locking pin 854, and the head 852 are alternately provided in the circumferential direction of the chain 8. In FIG. 3, the link member connected to the downstream side in the circumferential direction with respect to the right link member 80 is omitted, and the shaft portion 851 of the connection pin 85 is passed through the second insertion hole 81 b of the link plate 81. It shows. Further, with respect to the left link member 80, the link member and the connection pin connected on the upstream side in the circumferential direction are omitted. In the link member 80, the boss 83 may be omitted, and the head portion 852 of the connection pin 85 may be in direct contact with the link plate 81, and the retaining pin 854 may be engaged with the link plate 81. It may be arranged between the ring 853 and the ring 853. The link member 80 may not have the barrel portion 82, and the pair of opposing link plates 81 may be connected by a portion or member other than the barrel portion 82.

  A stay 86 is provided at the link member 80 shown at the center. As shown in FIG. 3 (b), the flight plate 9 is attached to the stay 86 via an attaching member 87. In FIG. 3A, in order to clearly show the link member 80, the flight plate is omitted and the stay 86 is shown in a simplified manner.

  Then, the sprocket as an example of the rotating wheel of this invention is demonstrated.

  Fig.4 (a) is the figure which looked at the sprocket shown in FIG. 2 from the pond width direction, and the figure (b) is BB sectional drawing of the sprocket shown to the figure (a). In FIG. 4A, the direction orthogonal to the paper surface is the pond width direction, and the clockwise direction indicated by the arrow is the circulation direction. In FIG. 4B, the lateral direction of the figure is the pond width direction. Further, in the sprocket shown in FIG. 4, the pond width direction is the thickness direction. In the present embodiment, the drive sprocket 5 and the driven sprocket 6 shown in FIG. 2 have substantially the same structure, and the drive sprocket 5 will be described as an example here.

  As shown in FIGS. 4A and 4B, the drive sprocket 5 includes a boss 51, and a central flange 52 radially extending from a central portion in the thickness direction at an outer peripheral portion of the boss 51; A pair of outer flanges 53 disposed on both sides in the thickness direction at the outer peripheral portion of the central flange 52 is provided. In the following description, only the both sides or one side where the pair of outer flanges 53 are disposed with respect to the central flange 52 may be referred to as the outer side.

  The bosses 51 are formed by joining a pair of boss forming members 51a and 51b in the thickness direction. The boss 51 has a boss hole 511 penetrating in the thickness direction. The boss hole 511 has a key groove 511a. The drive sprocket 55 is fixed to the drive shaft 55 by inserting the drive shaft 55 shown in FIG. 1 into the boss hole 511 and inserting a key (not shown) into the key groove 511a. When the pair of boss forming members 51a and 51b are joined, a groove 512 extending along the circumferential direction is formed on the outer peripheral portion of the joining surface of the pair of boss forming members 51a and 51b. The central flange 52 is in the form of a disk having a circular opening at the central portion, and the end on the inner peripheral side is fitted into the groove 512 of the boss 51. The pair of boss forming members 51a and 51b and the central flange 52 are fixed by a fastening member 513 including a bolt and a nut. The central flange 52 has a plurality of radially projecting engaging teeth 521 on its outer peripheral portion. The plurality of engagement teeth 521 are arranged circumferentially at an outer peripheral portion of the central flange 52 at intervals. The engagement teeth 521 have rising portions 5211 on both sides in the circumferential direction, which determine the teeth of the engagement teeth 521.

  The outer flange 53 has a donut disk shape thinner than the central flange 52, and the outer periphery is substantially the same size as the outer periphery of the central flange 52. The outer flange 53 is fixed to the outer side of the outer peripheral portion of the central flange 52 by a fastening member 532 via a spacer 54. The outer peripheral side portion of the central flange 52 and the outer peripheral side portion of the outer flange 53 are opposed to each other by an amount corresponding to the thickness of the spacer 54 in the thickness direction.

  The outer flange 53 has a plurality of radially projecting stop teeth 531 at its outer peripheral portion. Similar to the engagement teeth 521 of the central flange 52, the plurality of stop teeth 531 are circumferentially arranged on the outer peripheral portion of the outer flange 53 at intervals. In addition, the blocking teeth 531 have rising portions 5311 for determining the teeth of the blocking teeth 531 on both sides in the circumferential direction. The stop teeth 531 have a circumferential length shorter than the circumferential length of the engagement teeth 521. In addition, the height of the gear teeth of the stop teeth 531 is substantially the same as the height of the gear teeth of the engagement teeth 521. The outer flange 53 is fixed to the central flange 52 in a state in which the rising portion 5311 on the upstream side of the stopping tooth 531 is aligned with the rising portion 5211 on the upstream side of the engaging tooth 521 in the pond width direction There is. Because of these, when viewed from the pond width direction as shown in FIG. 4 (a), a part of the engagement tooth 521 on the downstream side in the circumferential direction is visible, and the other part of the engagement tooth 521 is restrained. Hiding in the teeth 531. That is, the engagement teeth 521 are longer in the circumferential direction than the stop teeth 531, in other words, the engagement teeth 521 protrude in the circumferential direction more than the stop teeth 531. Note that the engagement teeth 521 may be longer on the opposite side to the circumferential direction than the stop teeth 531, in other words, the engagement teeth 521 project on the opposite side to the circumferential direction from the stop teeth 531. It may be Furthermore, the length in the circumferential direction of the stop teeth 531 may be extended in the circumferential direction, and the stop teeth 531 and the engagement teeth 521 may coincide with each other when viewed from the pond width direction.

  The outer flange 53 may be provided only on one side of the center flange 52. Further, the drive sprocket 5 may be integrally configured with the boss 51 and the central flange 52, or may be integrally configured with the boss 51, the central flange 52, and the outer flange 53. Furthermore, the drive sprocket 5 may be entirely made of, for example, the same material made of synthetic resin or metal, and the boss 51 is made of metal, and the central flange 52 and the outer flange 53 are made of synthetic resin. For example, the material may be made different for each member.

  Then, an example of a power transmission device of the present invention provided with a rotating wheel and a chain will be described. As described above, the power transmission device 31 as an example of the present invention includes the chain 8, the sprockets 5, 6 and the sheave wheels 71, 71 shown in FIG. The drive sprocket 5 and the driven sprocket 6 are parts in which a part of the chain 8 is similarly wound. Here, a state in which a part of the chain 8 is wound around the drive sprocket 5 will be described as an example.

  Fig.5 (a) is a perspective view which shows typically a mode that a part of chain was wound around the drive sprocket shown in FIG. 2, FIG.5 (b) looks the same figure (a) from upper direction. FIG. In addition, in the figure (a), in order to simplify drawing, a flight board and a stay are abbreviate | omitted and only one part of the chain 8 is simplified and shown. Further, in FIG. 6B, the drive sprocket 5 shows only the engagement teeth 521 and the stop teeth 531, and the flight plate is omitted in order to make it easy to understand the engagement state of the drive sprocket 5 and the chain 8. Is shown in a simplified manner. In the figure (b), the vertical direction is the pond width direction. Moreover, in the figure (a), the direction shown by the arrow is the circumferential direction, and in the figure (b), the direction from the left to the right is the circumferential direction.

  As shown in FIG. 5 (a) and FIG. 5 (b), the link member 80 of the portion of the chain 8 wound around the drive sprocket 5 has the engagement teeth 521 and the stop teeth 531, 531 of the drive sprocket 5. The link plates 81 are respectively inserted between them. When the drive shaft (not shown) rotates, the sprocket 5 rotates, and the rising portion 5211 on the downstream side in the circumferential direction of the engagement tooth 521 engages with the barrel portion 82. That is, in the power transmission device 31 of the present embodiment, the barrel portion 82 of the chain 8 corresponds to the engaged portion in the present invention. In a state in which the engagement teeth 521 are engaged with the barrel portion 82, the stop teeth 531 are located outside the link plate 81 in the thickness direction. The engagement tooth 521 on the right side shown in FIG. 5B is released from the engagement and is separated from the barrel portion 82. When the engagement teeth 521 engage with the barrel portion 82, the power of the drive sprocket 5 is transmitted to the chain 8, and the chain 8 travels in the circumferential direction. When the chain 8 travels, the rising portion on the upstream side in the circumferential direction of the engagement teeth of the driven sprocket 6 engages with the barrel portion 82 of the chain 8, and the driven sprocket 6 rotates. The sheaves 71 and 72 also rotate as the chain 8 travels. Further, when the chain 8 travels, a flight plate (not shown) travels in the circumferential direction together with the chain 8 here, and sludge deposited on the pond bottom portion 1d and scum floating on the water surface W are scraped. Note that the length in the circumferential direction of the stop teeth 531 is extended in the circumferential direction, and when viewed from the pond width direction, a mode is adopted in which the stop teeth 531 and the engagement teeth 521 coincide with each other. In the engaged state, the stop tooth 531 may be engaged with the boss 83.

  FIG. 6 is a cross-sectional view taken along the line C-C in FIG. In FIG. 6, the left-right direction is the pond width direction, and the flight board 9 omitted in FIG. 5 (b) is shown.

  As shown in FIG. 6, a stay 86 is provided at the upper end of the pair of link plates 81. In addition, the flight plate 9 is fixed to the stay 86 via the mounting member 87 (see FIG. 3B). A triangular reinforcing portion 861 is provided at the connecting portion of the link plate 81 and the stay 86 from the upper end side portion of each link plate 81 to the outer side in the pond width direction of the stay 86. The reinforcing portion 861 improves the strength of the connection portion between the link plate 81 and the stay 86. The stop teeth 531 are set to a height at which the teeth do not contact the reinforcing portion 861. In the present embodiment, although the teeth of the engaging teeth 521 and the teeth of the stopping teeth 531 have the same height, no reinforcing portion is provided above the engaging teeth 521. Of the teeth may be higher than the teeth of the stop teeth 531. Furthermore, the stop teeth 531 may be provided only on one side outside the engagement tooth 521, or may be alternately provided on one side and the other side in the circumferential direction outside the engagement tooth 521. The engagement teeth 521 may be engaged with parts or members other than the barrel portion 82. For example, when the barrel portion 82 is omitted, the engagement teeth 521 may be engaged with the shaft portion 851 of the connection pin 85.

  In the present embodiment, the sprockets 5 and 6 (see FIG. 2), which are submerged in water and located on the water surface side, are outside of the link plate 81 in the thickness direction with the engagement teeth 521 engaged with the barrel 82. A stop tooth 531 is located at Therefore, when sloshing occurs and the chain 8 swings in the pond width direction, the link plate 81 contacts the stop teeth 531. As a result, the movement of the portion of the chain 8 wound around the sprockets 5 and 6 is stopped, making it difficult for the chain 8 to disengage from the sprockets 5 and 6. As described above, it is possible to make it difficult to derail by changing the structure of the sprockets 5 and 6 without providing the chain 8 with, for example, a protruding plate portion or the like for suppressing the derailment described in the background art. As a result, even if the chain 8 is long around the entire circumference, it is possible to suppress an increase in load on the drive device due to an increase in the manufacturing cost of the power transmission device 31 and an increase in the weight of the chain.

  Here, the stop teeth 531 may not be provided for either one of the drive sprocket 5 and the driven sprocket 6. However, the tension applied to the portion wound around the driven sprocket 6 is weaker than the tension applied to the portion wound around the drive sprocket 5 in the chain 8. Further, in the chain 8, the winding angle of the portion wound around the driven sprocket 6 is smaller than the winding angle of the portion wound around the drive sprocket 5. For these reasons, when sloshing occurs, the portion wound on the driven sprocket 6 is more likely to be released than the portion wound on the drive sprocket 5 in the chain 8. For this reason, it is preferable that the driven sprocket 6 on the water surface side has a stop tooth 531.

  Next, a modification of the present embodiment will be described. In the following description, constituent elements having the same names as the constituent element names described above will be described with the reference numerals used so far, and redundant description may be omitted.

  FIG. 7 is a diagram showing an aspect corresponding to FIG. 6 in the first modified example of the embodiment.

  As shown in FIG. 7, in the first modified example, the pond width direction both side portions on the lower end side of the stay 86 are cut out, and the tip side portion of the blocking tooth 531 is intruding into the cut out region. As a result, in the first modification, the teeth of the stop teeth 531 are higher than the teeth of the engagement teeth 521. For this reason, compared with the power transmission device 31 shown in FIGS. 3 to 6, the movement of the portion of the chain 8 wound around the sprockets 5 and 6 is further restrained, and the chain 8 is further derailed from the sprockets 5 and 6 It becomes difficult to do.

  Fig.8 (a) is a figure which shows the aspect corresponding to FIG.5 (b) in the 2nd modification of this embodiment. FIG. 8B is a cross-sectional view taken along the line D-D in FIG. 8A and is a view showing an aspect corresponding to FIG. 6 in the second modified example of the embodiment.

  As shown in FIG. 8A, in the second modification, the length of the stop teeth 531 in the circumferential direction is shorter than that of the embodiment shown in FIGS. In the engaged state, the stop teeth 531 are located between the boss 83 of the link member 80 and the stay 86. Thus, the stop teeth 531 do not interfere with the stay 86. For this reason, even if the notch 86a as in the first modified example shown in FIG. 7 is not formed in the stay 86, as shown in FIG. It can be higher than the teeth.

  In the first modification and the second modification, the stop teeth 531 can set teeth within a range not contacting the flight plate 9, and the teeth of all the stop teeth 531 can be engaged with the engagement teeth 521. It does not have to be higher than the teeth. For example, high and low stopping teeth 531 may be provided in the circumferential direction of the sprockets 5 and 6 every other one or a plurality of teeth. It may be provided alternately on one side and the other side. Furthermore, in the sprockets 5 and 6 provided on each of the pond width direction both ends, the teeth of the stop teeth 531 on the other sprocket side (inside the pond width direction) of each are more than the teeth of the central engaging teeth 521 Alternatively, the teeth of the stop teeth 531 on the opposite side (outward in the pond width direction) of the respective other sprockets may be higher than the teeth of the central engagement teeth 521. Good.

  FIG. 9 is a cross-sectional view showing an aspect in which a sludge collector provided with a power transmission device according to a second embodiment of the present invention is disposed on the accumulation groove of the sedimentation basin. In FIG. 9, the front side in the drawing is the upstream side, and the rear side in the drawing is the downstream side. Moreover, in FIG. 9, a mode that the upstream part of the sedimentation basin 1 'in which the sludge pit 42 was provided was cut | disconnected in the pond width direction is shown.

  As shown in FIG. 9, a pair of accumulation grooves 421 connected to the sludge pit 42 is provided on both sides in the pond width direction of the sludge pit 42. Further, in the sedimentation basin 1 ′, the downstream side of the sludge pit 42 and the accumulation groove 421 is divided into four regions by three partition walls 1 e extending in the longitudinal direction. A pond bottom 1 d is formed in each of the four regions, and a sludge collector (not shown) is provided above the respective pond bottom 1 d. In addition, a sludge collector 3 'is disposed above each of the pair of accumulation grooves 421. The sludge collector 3 'has a pair of power transmission devices 31' provided at both ends of the accumulation groove 421 in the width direction (the direction orthogonal to the sheet in FIG. 9) of the chain 8 'of the power transmission device 31'. It has a plurality of flight boards 9 'bridged between them. A driving sprocket 5 'as an example of a rotating wheel according to the present invention is disposed on the water surface W side, and sheave wheels 71' and 72 'are disposed on the accumulation groove 421 outside the pond width direction and inside the pond width direction. It is done. The chain 8 'is an annular one forming a circumferential track in which a track along the accumulation groove 421 and a track wound around the drive sprocket 5' are connected.

  The sludge deposited on the pond bottom portion 1d is drawn to the accumulation groove 421 by the flight plate when a sludge collector chain (not shown) travels. The sludge scraped to the accumulation groove 421 is scraped into the sludge pit 42 by the flight plate 9 'when the chain 8' of the power transmission device 31 'travels. Also in the present embodiment, the drive sprocket 5 'submerged in water and positioned on the water surface side has the same configuration as the sprocket 5 shown in FIG. As a result, sloshing occurs, and even if the portion of the chain 8 'wound around the drive sprocket 5' swings in the pond width direction, the chain 8 'is not easily released. As described above, the number of the rotating wheels immersed in the water and positioned on the water surface may be one, or three or more.

  According to the rotating wheel and the power transmission device described above, it is difficult to disengage even when sloshing occurs, and it is possible to suppress an increase in load on the drive device due to an increase in manufacturing cost and an increase in the weight of the chain.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, in the present embodiment, the power transmission devices 31, 31 'are used for the sludge collectors 3, 3', but the present invention is not limited to this, and various devices that need to transmit power such as a drive shaft It can be applied to machines and the like.

The rotating wheel described so far is a rotating wheel in which a pair of link plates facing each other at intervals are connected in the circumferential direction and a chain including an engaged portion is wound between the pair of link plates,
An engagement tooth which protrudes in the radial direction of the rotating wheel at a central portion in the thickness direction of the rotating wheel and engages with the engaged portion;
By projecting in the radial direction on one end side in the thickness direction, the engagement teeth are positioned on the outer side in the thickness direction with respect to the link plate in a state of being engaged with the engaged portion. And a stop tooth arranged to overlap the link plate from the outer side,
A plurality of the engagement teeth and the stop teeth are provided in the circumferential direction,
Between the said stop teeth adjacent to the said circumferential direction, the said stop teeth are recessed by projecting in the said radial direction, It is characterized by the above-mentioned.

  Here, the stop teeth may be protruded at both end sides in the thickness direction. Furthermore, the plurality of engagement teeth may have the same or different shapes, and the plurality of stop teeth may have the same or different shapes.

  According to this rotating wheel, sloshing occurs, and when the chain swings, the link plate in the portion of the chain wound around the rotating wheel contacts the stop teeth. As a result, the movement of the portion of the chain wound around the rotating wheel is stopped, and the chain is less likely to disengage from the rotating wheel. In addition, as the chain, for example, a chain having a conventional structure not provided with a projecting plate portion or the like for suppressing derailing can be used. Even if the chain has a long circumference, the rotating ring and the chain can be used. It is possible to suppress an increase in the load on the drive device due to the increase in the manufacturing cost of the power transmission device and the increase in the weight of the chain.

  In addition, in this rotating wheel, the stop teeth may be higher in tooth height than in the engagement teeth.

  Here, the length of the circumferential direction of the stop tooth may be shorter than the length of the circumferential direction of the engagement tooth.

  If the teeth of the stop teeth are higher than the teeth of the engagement teeth, the movement of the portion of the chain wound on the rotating wheel is further stopped, and the chain is released from the rotating wheel It becomes even more difficult to leave the wheel.

The power transmission apparatus described so far is a power transmission apparatus having a water side rotation wheel immersed in water and located on the water surface side and a chain partially wound around the water surface side rotation wheel,
The chain connects a pair of link plates facing each other in the circumferential direction with an interval and has an engaged portion between the pair of link plates,
The water side rotating wheel is
An engagement tooth which protrudes in the radial direction of the water surface side rotating wheel at a central portion in the thickness direction of the water surface side rotating wheel and engages with the engaged portion;
By projecting in the radial direction on one end side in the thickness direction, the engagement teeth are positioned on the outer side of the link plate in the thickness direction in a state of being engaged with the engaged portion, with respect to the engagement teeth. And a stop tooth arranged to overlap the link plate from the outside in between,
A plurality of the engagement teeth and the stop teeth are provided in the circumferential direction,
Between the said stop teeth adjacent to the said circumferential direction, the said stop teeth are recessed by projecting in the said radial direction, It is characterized by the above-mentioned.

  Here, the number of the water surface side rotary wheels may be one or plural.

  According to this power transmission device, sloshing occurs, and when the chain swings, the link plate in the portion of the chain wound around the water-side rotary wheel contacts the stop teeth. As a result, the movement of the portion of the chain wound around the water surface side rotating wheel is stopped, and the chain is less likely to be released from the water surface side rotating wheel. In addition, it is not necessary to provide, for example, a projecting plate portion or the like for suppressing wheel removal in the chain, and even if the chain is long around the entire circumference, it is possible to increase the manufacturing cost and the weight of the chain Load increase can be suppressed.

Further, in the power transmission device, the power transmission device further includes a lower rotating wheel positioned below the water surface rotating wheel.
The chain may be partially wound around the lower rotary wheel.

  Even when the power transmission device is configured to include the lower rotary wheel, the chain can be made difficult to disengage from the rotary wheel when sloshing occurs by having the rotary wheel.

  The lower wheel may have the same configuration as the water surface wheel, but since the lower wheel is located below the water wheel, sloshing occurs. In addition, the portion of the chain wound around the lower rotary ring has less swinging motion than the portion wound around the water-side rotary ring. For this reason, a sprocket, a sheep car or the like which does not have the stop teeth may be used as the lower rotary wheel. This can further suppress the increase in manufacturing cost.

3,3 'sludge collector 31, 31' power transmission 5,5 ', 6 sprocket 521 engaging tooth 5211 rising portion 531 stopping tooth 8, 8' chain 80 link member 81 link plate 82 barrel portion 9, 9 'flight Plate W water surface

Claims (2)

In a power transmission device having a rotating wheel and a chain partially wound around the rotating wheel,
The chain is
An engaged portion which is provided between a pair of link plates facing each other at intervals and which connects the pair of link plates;
A boss portion projecting on the side opposite to the side where the pair of link plates face each other;
And a stay which is disposed at an interval from the boss portion in the circumferential direction of the chain and has an extension portion extending from the pair of link plates to the opposite side,
The rotating wheel is
An engagement tooth which protrudes in the radial direction of the rotating wheel at a central portion in the thickness direction of the rotating wheel and engages with the engaged portion;
In the state in which the engagement tooth is engaged with the engaged portion, the radially outer side with respect to the link plate has the stop tooth protruding in the radial direction, avoiding the boss and the extension. Power transmission device characterized by   The power transmission device according to claim 1, wherein the stop tooth protrudes in the radial direction more than the engagement tooth.

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