JP4850225B2 - Chain power transmission device and sludge scraper - Google Patents

Description

  The present invention relates to a technical field of a chain power transmission device that transmits a driving force of a power source such as a motor by a chain and a sprocket, and a technical field of a sludge scraper using the chain power transmission device.

  Conventionally, in sewage treatment plants and water treatment plants, inflow water mixed with mud and earth is once introduced into a settling tank, and in this settling tank, mud and earth and sand in the inflow water are precipitated and separated from water. . The precipitated sludge is collected in a sludge pit provided on one side of the sedimentation tank bottom by a sludge scraper installed at the bottom of the sedimentation tank, and then discharged to the outside of the sedimentation tank for processing.

  As such a conventional sludge scraper, a chain flight type sludge scraper is known (see, for example, Patent Document 1). This chain flight type sludge scraper is provided with a chain power transmission device. This chain power transmission device is composed of a drive sprocket, a driven sprocket, and a chain that is constituted by a number of links connected endlessly and is spanned between the drive sprocket and the driven sprocket. In that case, a sprocket using a large number of rollers is used for the driving sprocket and the driven sprocket. The endless chain link is engaged with each roller of the drive sprocket and driven sprocket, so that power is transmitted from the drive sprocket to the endless chain, and the endless chain rotates while rotating the driven sprocket. . A flight (scratching member) is attached to the link of the chain. And a flight rotates with rotation of an endless chain, and the sludge settled in the sedimentation tank is scraped up to a sludge pit by a flight.

By the way, in the chain power transmission device of such a chain flight type sludge scraper, the chain link may come off from the roller and the tooth jump may occur when the flight is overloaded when the sludge is scraped. is there. Therefore, in the chain flight type sludge scraper described in Patent Document 1, a chain guide for preventing tooth skipping of the chain is provided in the vicinity of the drive sprocket or the driven sprocket. The chain guide has a chain pressing member provided with a link, and the chain pressing member is attached to a base provided on the side wall of the settling tank. The chain pressing member is biased by a spring, so that the tip of the chain pressing member presses the flight and chain link against the sprocket. Thereby, tooth skipping of the link is prevented and power transmission can be performed more reliably.
Japanese Patent Laid-Open No. 2005-138023.

  However, the chain power transmission device described in Patent Document 1 has a problem that it is difficult to accurately position the chain pressing member with respect to the sprocket because the chain pressing member is provided on the side wall of the settling tank.

  In the chain flight type sludge scraper, the chain pressing member of the chain power transmission device presses the flight against the sprocket. For this reason, the chain pressing member must be provided on the opposite side of the flight from the flight in the flight height direction, and the chain flight type sludge scraper becomes larger by that amount. In particular, if the height of the flight is increased in order to increase the amount of sludge scraped by the flight, the chain flight sludge scraper becomes even larger.

The present invention has been made in view of such circumstances, and its purpose is to more effectively position the chain pressing member with respect to the sprocket while effectively preventing the tooth skipping of the link and performing power transmission more reliably. It is to provide a chain power transmission device that can be performed with high accuracy.
Another object of the present invention is to provide a sludge scraping machine that can be formed as compact and compact as possible while preventing the tooth skipping of the link by the chain pressing member and performing power transmission more reliably. .

To solve the problems described above, the chain power transmission device of the present invention is rotatably together provided arranged at equal intervals over the entire circumference on its center of rotation and the same circumference a plurality of sprockets side engagement Chain power that includes at least a sprocket having a portion and an endless chain that removably engages with a part of the plurality of sprocket side engaging portions, and power is transmitted between the sprocket and the chain. In the transmission device, the chain is formed such that a plurality of links are connected to each other so as to be rotatable relative to each other and endlessly, and the links can be engaged with and disengaged from the sprocket side engaging portion. among the links, a link at least one link supporting member is detachably fixed, the chain is engaged with the sprocket-side engagement portion Region comprises a pair of chains holding member to prevent the disengagement from said sprocket-side engagement portion that, the pair of chains holding member to said sprocket, together with the sprocket is rotatable relative, detachably to the link It is characterized by being supported so as to be opposed to each other with a certain gap in the axial direction of the rotation shaft of the sprocket so that the support member fixed to can be passed .

Moreover, the chain power transmission device of the present invention is characterized in that the chain pressing member is supported by a rotating boss portion of the sprocket.
Furthermore, the chain power transmission device of the present invention has a disc-like or substantially disc-like sprocket main body capable of rotating the sprocket, and the sprocket side engaging portion is provided at the outer peripheral edge of the sprocket main body. It is a chain engaging roller.

Furthermore, chain power transmission device of the present invention, arcuate chain the chain presser member, before Symbol chain is prevented from disengagement from said sprocket-side engagement portion is a region for engaging the sprocket-side engagement portion It is characterized by having a pressing member, and a chain retainer member side boss portion supported in rotation the boss portion of the front Symbol sprocket.

Furthermore, chain power transmission device of the present invention, that the pre-Symbol chain presser member, to prevent the disengagement from the links before kissing sprocket-side engagement portion and the sprocket-side engagement portion in the region which engages the It is a feature.

On the other hand, the sludge scraper of the present invention includes at least a chain power transmission device including a sprocket and an endless chain that can be engaged with the sprocket, and a predetermined number of scraping members provided on the chain, The chain power transmission device is a chain power transmission device of the present invention, wherein the scraping member is attached to the link with a predetermined gap between the link and the scraping member is the pair of scraping members. When located in the region of the chain pressing member, at least a part of the pair of chain pressing portions is positioned in the predetermined gap between the scraping member and the link . .

The chain power transmission device according to the present invention configured as described above includes a pair of chain pressing members that prevent the chain from being detached from the sprocket side engaging portion in a region where the chain is engaged with the sprocket side engaging portion. together, the sprockets these chains pressing member, the sprocket is supported so as to be relatively rotatable. Therefore, the pair of chain pressing members can be positioned with higher accuracy with respect to the sprocket side engaging portion of the sprocket from which the chain can be removed from the diameter. As a result, even when a high load is applied to the chain , the chain pressing member effectively removes the chain from the sprocket side engaging portion in the region where the chain is engaged with the sprocket side engaging portion, that is, the chain jumps effectively. Thus, the chain pressing member can be positioned with respect to the sprocket with higher accuracy while the power is transmitted more reliably. In addition, a pair of chain pressing members are connected to the sprocket endlessly to each other so that a support member detachably fixed to at least one of the plurality of links constituting the chain can pass therethrough. It supports so that it may oppose with a certain clearance gap in the axial direction of a rotating shaft.

  Further, according to the sludge scraping machine equipped with the chain power transmission device of the present invention, the chain pressing member can be positioned with high accuracy with respect to the sprocket side engaging portion of the sprocket. When the flight) is located in the region of the chain pressing member, the chain pressing portion can be accurately positioned in the gap between the chain and the scraping member (flight), and this gap can be further reduced. . Therefore, the chain pressing member can be made smaller than the chain pressing member provided on the outer peripheral side of the scraping member (flight) as in the prior art. This realizes a sludge scraping machine that can be made more compact and compact while preventing chain skipping by the chain pressing member even when a heavy load is applied to the chain and performing power transmission more reliably. be able to.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a front view schematically showing an example of an embodiment of a sludge scraper using the chain power transmission device of the present invention, and FIG. 2 is a plan view excluding some components of FIG. FIG. 3 is a diagram excluding some components when viewed from the III direction in FIG. 1.

As shown in FIGS. 1 to 3, the sludge scraper 1 of this example includes a chain power transmission device 3 provided on a frame body 2. The chain power transmission device 3 is stretched over a pair of drive sprockets 4, 5, two pairs of driven sprockets 6, 7, 8, 9, one drive sprocket 4 and one pair of driven sprockets 6, 8. An endless chain 10 and an endless chain 11 spanned over the other drive sprocket 5 and one pair of driven sprockets 6 and 9. The pair of drive sprockets 4 and 5 rotate in synchronization with each other, the pair of driven sprockets 6 and 8 rotate in synchronization with each other, and the other pair of driven sprockets 7 and 9 rotate in synchronization with each other. Is

  The drive sprockets 4, 5 and the driven sprockets 6, 7, 8, 9 all have the same configuration. Therefore, only one drive sprocket 4 will be described, and description of the other sprockets 5, 6, 7, 8, and 9 will be omitted.

4A and 4B show the drive sprocket, where FIG. 4A is a front view, FIG. 4B is a sectional view taken along line IVB-IVB in FIG. 4A, and FIG. 4C is a partially enlarged sectional view of FIG.
As shown in FIGS. 4A to 4C, the drive sprocket 4 includes a sprocket body 12 formed in a substantially disc shape with plastic, and a concentric circle at the outer peripheral edge of the sprocket body 12 with the center of rotation of the sprocket body 12. A predetermined number (21 in the illustrated example) of chain engagement rollers 13 (corresponding to the sprocket side engagement portion of the present invention) are disposed on the top at equal intervals (fixed pitch).

The sprocket body 12 has a pair of annular roller support flanges 12a and 12b protruding outward in the radial direction at a predetermined interval. These roller support flanges 12a and 12b are integrally formed with the sprocket body 12 as a single member. Sleeves 14 and 15 having flanges are fitted into the through holes of the pair of roller support flanges 12a and 12b, respectively. A support bolt 16 extends through the sleeves 14 and 15 and is fixed between the roller support flanges 12 a and 12 b and fixed by a nut 17. In that case, washers 18 and 19 are interposed between the head 16 a of the support bolt 16 and the sleeve 14 and between the nut 17 and the sleeve 15, respectively. The support bolt 16 is connected to the sprocket body 12.
As many as the chain engaging rollers 13 are arranged at equal intervals (constant pitch) on a concentric circle with the rotation center. Then, the chain engaging rollers 13 are respectively positioned between the pair of roller support flanges 12a and 12b and are supported on the support bolts 16 so as not to rotate or to rotate.

Each chain engaging roller 13 is made of plastic, and has a pipe portion 13a and flanges 13b and 13c formed at both ends thereof. The length of the pipe portion 13a is set to be slightly longer than the maximum width of the link 20 of the chain 10 shown in FIGS. 5 (a) to 5 (c) described later. Further, the opposing surfaces of both flanges 13b and 13c are formed in a tapered shape inclined with respect to the direction orthogonal to the axial direction so that the thickness of the flanges 13b and 13c decreases from the inner periphery to the outer periphery. ing. Thereby, while the inner peripheral part of the opposing surface of both flanges 13b and 13c is made to suppress meandering of the chain 10 engaged with the pipe part 13a, the outer peripheral part of the opposing surface of both flanges 13b and 13c is Link 2
Friction with zero is not so much generated.

Note that the flange 13b, 13c of the chain engaging roller 13 can be omitted, and the pipe portion 13a can be formed over substantially the entire distance between the pair of roller support flanges 12a, 12b. With this configuration, the width of the link 20 can be increased to almost the entire distance between the pair of roller support flanges 12a and 12b. As a result, the contact portion between the chain engaging roller 13 and the link 20 can be further increased, and the frictional force between the chain engaging roller 13 and the link 20 is reduced. As a result, each wear amount of the chain engaging roller 13 and the link 20 is reduced.

FIG. 5 shows a part of the chain, (a) is a plan view, (b) is a front view, (c) is a front view of the links constituting the chain, and (d) is a link connecting member for connecting the links. It is an exploded view.
As shown in FIGS. 1 and 5 (a) and 5 (b), the chain 10 is constituted by connecting a plurality of links 20 in a link connection member 21 so as to be relatively rotatable and endlessly. Each link 20 has the same configuration, and is formed in a Y shape in plan view having a bifurcated portion 20a on one end side. In the two links 20 and 20 adjacent to each other, the other end 20b of the other link 20 is fitted to the bifurcated portion 20a of the one link 20 so as to be relatively rotatable and detachable.

As shown in FIG. 5C, the through-hole 20c is formed on the bifurcated portion 20a side and the other end portion 20b side of each link 20 in a direction perpendicular to the longitudinal direction of the link 20 (that is, the width direction of the link 20). , 20d are provided. Further, the fork 20a side and the other end 2 of each link 20
On the 0b side, the chain engaging rollers 1 of the sprockets 4, 5, 6, 7, 8, 9 are respectively provided.
A pair of first and second engaging portions 20e and 20f that are detachably engaged with the three pipe portions 13a are provided. Further, the first and second engaging portions 20 e and 20 f are formed by one concave portion, and the concave portion is configured as a roller accommodating portion for accommodating the chain engaging roller 13. Of course, the pair of first and second engaging portions 20e and 20f can be provided separately and independently.

As shown in FIG. 5D, each link connecting member 21 has a connecting pin 21a, a washer 21b, and a retaining ring (spring washer) 21c. The connecting pin 21a has a head portion 21a ₁ on _one end side and a reduced diameter portion 21a ₂ on the other end side. Then, as shown in FIG. 5A described above, the other end 20b of the other link 20 adjacent to the link 20 is fitted into the bifurcated portion 20a of the one link 20, and The through hole 20c and the through hole 20d of the other link 20 are aligned. In this state, the connecting pin 21a is passed through the through holes 20c and 20d from one side of the bifurcated portion 20a, and the reduced diameter portion 21 thereof.
A part of a ₂ protrudes from the other side of the bifurcated portion 20a. With fitting the washer 21b in the reduced diameter portion 21a ₂ that this protruding to allow fit and remove the stop ring 21c on the engaging groove 21a ₃ formed in the reduced diameter portion 21a _2. Thus, the two links 20, 20 adjacent to each other are connected to the link connecting member 21 so as to be relatively rotatable and detachable. Similarly, the other links 20 are sequentially connected by the link connecting member 21 to form the endless chain 10. The other chains 11 are formed in the same manner.

FIG. 6 is a partial view for explaining the engagement between the drive sprocket and the chain.
As shown in FIG. 6, the chain 10 is partially wound around the outer peripheral side of the drive sprocket 4. The other chain 11 is also partially wound around the outer peripheral side of the other drive sprocket 5 in the same manner. As shown in FIGS. 1 and 2, the drive sprockets 4 and 5 are connected to a motor 22 on which a frame body 2 as a power source is installed by a drive sprocket drive power transmission device 23. That is, the drive sprocket drive power transmission device 23 includes a gear-like drive sprocket 23 a attached to the rotation shaft 22 a of the motor 22 and the rotation shaft 2 of the drive sprockets 4 and 5.
4 has a gear-like driven sprocket 23b attached to the drive shaft 4, and an endless chain 23c spanned over the drive sprocket 23a and the driven sprocket 23b.

  When the drive sprocket 23a is rotationally driven by the motor 22, the rotation of the drive sprocket 23a is transmitted to the driven sprocket 23b via the chain 23c, and the driven sprocket 23b is rotated. Since the rotation shaft 24 rotates by the rotation of the driven sprocket 23b, the drive sprockets 4 and 5 rotate. Thereby, a pair of chains 10 and 11 rotate synchronously.

When the drive sprocket 4 is rotated counterclockwise as indicated by an arrow α in Figure 1, the first engagement chains engaging roller 13 of the sprocket 4 is engaged with the first engagement portion 20e of the one link 20 The joint part 20e is pressed. As a result, the chains 10 and 11 start to rotate in the same direction as the sprocket 4. Subsequently, the rotation of the drive sprocket 4 causes the other chain engagement roller 13 to engage with the first engagement portion 20e of the link 20 adjacent to the link 20, and similarly press the first engagement portion 20e. To do. In this way, the other chain engaging rollers 13 are sequentially engaged with the first engaging portions 20 e of the links 20 that reach the sprocket 4 by the rotation of the sprocket 4. Thus, the chains 10 and 11 are continuously rotated by the rotation of the sprocket 4.

As shown in FIGS. 1, 3, 7, and 8, a predetermined number of flights (scratching members) 25 are arranged around the entire circumference of each chain 10, 11 on a part of the link 20 of each chain 10, 11. It is attached at equal intervals along. Specifically, an L-shaped plate-like attachment 27 having a support base 26 is detachably fixed to the links 20 of the chains 10 and 11. Then, the flight 2 is attached to each L-shaped plate-like attachment 27 of the link 20 of each chain 10, 11.
5 is detachably mounted. In that case, a predetermined small gap g ₁ is formed between each link base end face 25a, 27a of each flight 25 and each attachment 27 and each flight 20 and each attachment 27 side facing face 20a by each support base 26. ing.
Then, as shown in FIG. 1, the flight 25 is rotated along with the rotation of the endless chains 10 and 11.
The sludge that has settled in the sedimentation tank 34 is scraped to the sludge pit by the flight 25.

As shown in FIG. 8, a pair of chain pressing members 28 and 29 are supported on the rotating boss portion 4a of the drive sprocket 4 so as to be rotatable relative to the rotating boss portion 4a. As shown in FIGS. 9A to 9C, the chain pressing members 28 and 29 are formed symmetrically with respect to the straight line β in FIG. 9C, but have the same configuration.

  The chain presser member 28 will be described. The chain presser member 28 includes an annular support disc 28a and an annular ring extending in the direction perpendicular to the support disc 28a on the outer peripheral edge of the support disc 28a. A flange-shaped pressing plate 28b, a predetermined number of ribs 28c that reinforce the fixation between the supporting disc 28a and the pressing plate 28b, and an inner peripheral edge of the supporting disc 28a that extends in a direction perpendicular to the supporting disc 28a. It has a cylindrical boss portion 28d and a predetermined number of ribs 28e that reinforce the fixing of the support disk 28a and the cylindrical boss portion 28d.

As shown in FIGS. 9A and 9B, a trapezoidal arc-shaped chain pressing portion 28b ₁ is provided on a part of the pressing plate 28b so as to protrude on the side opposite to the support disk 28a. The chain pressing portion 28 b ₁ is disposed in a region where at least the first engaging portion 20 e of the link 20 is engaged with the chain engaging roller 13. In that case, the chain presser portion 28b ₁ in this example is extended from the uppermost position a chain presser member 28 to move Direction opposite direction of the chain 10. Of course, the chain pressing portion 28b ₁ can be provided at a position other than the illustrated position, but it is desirable to provide it at the illustrated position. As shown in FIG. 9 (a), the circumferential length γ of the chain pressing portion 28b ₁ can be set to an appropriate length, but the chain 10 can more reliably prevent tooth skipping. In order to obtain the above, it is desirable to set it to be equal to or longer than the length of one link 20 (one pitch of the chain). The inclined end of the chain pressing portion 28b _{1 on} the link entry side is a guide end 28b ₂ for guiding the support base 26.

Similarly to the chain pressing member 28, the other chain pressing member 29 is also provided with an annular support disk 29a and an outer periphery of the support disk 29a extending in a direction perpendicular to the support disk 29a and the guide end 29b _2. An annular flange-shaped presser plate 29b having a predetermined number of ribs 29c for reinforcing the fixation between the support disc 29a and the presser plate 29b, and an inner periphery of the support disc 29a in a direction perpendicular to the support disc 29a. It has an extended cylindrical boss portion 29d, and a predetermined number of ribs 29e that reinforce the fixing of the support disc 29a and the cylindrical boss portion 29d.

Then, as shown in FIGS. 9A to 9C, the pair of chain pressing members 28, 29
Are connected by the connecting member 30 so that the chain pressing portions 28b ₁ and 29b ₁ face each other with a certain gap g ₂ . As shown in FIG. 8, the size of the gap g ₂ is such that the support base 26 can pass through the gap g ₂ and the link 20 moves toward the holding plates 28b and 29b in the direction away from the chain engaging roller 13. In this case, the link 20 is set to a size capable of preventing contact with the chain pressing portions 28b ₁ and 29b ₁ and coming off from the chain engaging roller 13, that is, tooth skipping.

As shown in FIGS. 7 and 8, a pair of chain pressing members 28, 29 connected to each other.
These boss portions 28d and 29d are fitted and supported rotatably on the rotating boss portion 4a of the drive sprocket 4, respectively. These boss portions 28d and 29d are respectively connected to the rotating shaft 24.
Are positioned in the axial direction by the collars 31 and 32 fixed to each other. In this case, the pair of chain pressing members 28 and 29 are fixed to the inner wall of the sedimentation tank 34, for example, via the rotation prevention bracket 33 so as not to rotate together with the drive sprocket 4 when the drive sprocket 4 rotates.

In this state where the pair of chain pressing members 28 and 29 are rotatably fitted and supported on the rotating boss portion 4a, when the flight 27 is positioned in the region of the chain pressing members 28 and 29, both chain pressing portions 28b ₁ 29b ₁ is positioned in the gap g ₁ and the support base 26 passes through the gap g ₂ .

On the other hand, although not shown, the pair of chain pressing members 28,
A pair of chain pressing members similar to 29 are provided in the same manner as the one driving sprocket 4, and the pair of chain pressing members prevent tooth skipping of the other chain 11 with respect to the driving sprocket 5.

According to the chain power transmission device 3 of this example configured as described above, the pair of chain pressing members (28, 29) (the chain pressing member on the side of the driving sprocket 5 has no reference numeral, so parentheses are attached to both driving sprockets. 4 and 5 represent chain pressing members) and are supported by the rotating boss portions 4a and 5a of the drive sprockets 4 and 5 so as to be relatively rotatable. Therefore, the pair of chain pressing members (28, 29) can be positioned with higher accuracy with respect to the chain engaging rollers 13 of the drive sprockets 4, 5. That is, even if a high load is applied to the chains 10 and 11, the chain pressing members (28, 29) effectively prevent tooth skipping of the link 20 and perform power transmission more reliably, while also ensuring power transmission. The chain pressing member can be positioned with higher accuracy.

In addition, according to the sludge scraper 1 including the chain power transmission device 3 of this example, the pair of chain pressing members (28, 29) are more tightly coupled to the chain engaging rollers 13 of the drive sprockets 4, 5. Since the positioning can be performed with high accuracy, when the flight 27 is positioned in the region of the chain pressing member (28, 29), the two chain pressing portions (28b ₁ , 29b ₁ ) are separated by the gap between the link 20 and the flight 27. g ₁ can be positioned accurately,
This gap g ₁ can be further reduced. Therefore, the chain pressing member (28, 29) can be formed in a smaller size as compared with the chain pressing member provided on the outer peripheral side of the flight as in the prior art. In other words, even when a heavy load is applied to the chains 10 and 11, the chain pressing members (28, 29) prevent the teeth of the link 20 from being skipped and perform power transmission more reliably, and can be made more compact and compact. The possible sludge scraping machine 1 can be realized.

  The chain power transmission device and the sludge scraper of the present invention are not limited to the above-described examples, and various design changes can be made within the scope of the matters described in the claims.

The chain power transmission device according to the present invention can be suitably used for a chain power transmission device that transmits the driving force of a power source such as a motor by a chain and a sprocket.
Moreover, the sludge scraping machine which concerns on this invention can be utilized suitably for a sludge scraping machine provided with a chain power transmission device.

It is a front view which shows typically an example of embodiment of the sludge scraper using the chain power transmission device of this invention. FIG. 2 is a plan view excluding some components of FIG. 1. It is a figure which removes and shows a part of component when it sees from the III direction in FIG. A drive sprocket is shown, (a) is a front view, (b) is a sectional view taken along line IVB-IVB in (a), and (c) is a partially enlarged sectional view of (b). The chain is partially shown, (a) is a plan view, (b) is a front view, (c) is a front view of the links constituting the chain, and (d) is an exploded view of a link connecting member for connecting the links. is there. It is a fragmentary figure explaining engagement with a sprocket and a chain. It is a figure which shows the mutual positional relationship of a link, a flight, and a chain pressing member. It is sectional drawing which follows the VIII-VIII line in FIG. The chain pressing member is shown, (a) is a front view, (b) is a plan view, and (c) is a sectional view taken along line IXC-IXC in (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sludge scraping machine, 2 ... Frame main body, 3 ... Chain power transmission device, 4, 5 ... Drive sprocket, 4a ... Rotary boss | hub part, 6, 7, 8, 9 ... Driven sprocket, 10, 11 ... Chain, 12 ... sprocket body, 13 ... chain engaging roller, 20 ... link, 20e ... first engaging portion, 20f ... second engaging portion, 21 ... link connecting member, 22 ... motor, 23 ... power transmission device for driving sprocket drive 25 ... Flight (scratching member), 26 ... Support base, 27 ... Attachment, 28, 29 ... Chain pressing member, 28a, 29a ... Support disk, 28b, 29b ...
Presser plate, 28b ₁ , 29b ₁ ... Chain presser 28d, 29d ... Cylindrical boss, g ₁ , g ₂
…gap

Claims (6)

A sprocket having a plurality of sprocket-side engagement portion disposed at equal intervals over the entire circumference with provided rotatably on the center of rotation and the same circumference, a portion of said plurality of sprocket-side engagement portion A chain power transmission device comprising at least an endless chain that engages and disengages, wherein power transmission is performed between the sprocket and the chain;
The chain is formed such that a plurality of links are connected to each other so as to be rotatable relative to each other and endlessly, and the links can be engaged with and disengaged from the sprocket side engaging portion.
Among the plurality of links, at least one link is a link to which the support member is detachably fixed,
A pair of chain pressing members for preventing the chain from being detached from the sprocket side engaging portion in a region where the chain is engaged with the sprocket side engaging portion;
The pair of chain pressing members are fixed in the axial direction of the rotation axis of the sprocket so that the sprocket can rotate relative to the sprocket and a support member detachably fixed to the link can pass. A chain power transmission device, wherein the chain power transmission device is supported so as to face each other with a gap .   The chain power transmission device according to claim 1, wherein the chain pressing member is supported by a rotating boss portion of the sprocket. The sprocket has a rotatable disc- shaped sprocket main body, and the sprocket side engaging portion is a chain engaging roller provided on an outer peripheral edge of the sprocket main body. The chain power transmission device described in 1. The chain presser member, before SL chain and an arc-shaped chain retainer member to prevent the disengagement from said sprocket-side engagement portion is a region for engaging the sprocket-side engagement portion, rotatable boss portion before Symbol sprocket The chain power transmission device according to any one of claims 1 to 3, further comprising a chain pressing member-side boss portion supported by the shaft. The chain presser member is any one of claims 1 to 4, characterized in that to prevent the disengagement from the links before kissing sprocket-side engagement portion and the sprocket-side engagement portion in the region which engages the The chain power transmission device described in 1. A chain power transmission device comprising a sprocket and an endless chain engageable with the sprocket, and at least a predetermined number of scraping members provided on the chain;
The chain power transmission device is a chain power transmission device according to claim 5,
The scraping member is attached to the link with a predetermined gap between the link and the link ,
When the scraping member is positioned in the region of the pair of chain pressing members, at least a part of the pair of chain pressing portions is positioned in the predetermined gap between the scraping member and the link. A sludge scraping machine characterized by

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