JP2012207742A - Chain structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain structure which can easily perform the installation of a chain-tooth jump-out prevention mechanism and position adjustment, and can improve its durability.SOLUTION: The chain structure 40 comprises: a sprocket 4 having pins 10 at it circumference; a chain 12 which is wound to the external periphery of the sprocket 4 and has recesses 14 engaged with the pins 10; and the tooth jump-out prevention mechanism 44 which prevents the recesses 14 from coming off from the pins 10 engaged with the recesses. The tooth jump-out prevention mechanism 44 is arranged outside the chain 12 in the radial direction of the sprocket 4 and has only one tooth jump-out prevention member 44a which is arranged so as to be parallel with the width direction of the chain 12 and in the vicinity of the chain 12.

Description

  The present invention relates to a chain structure having a function for preventing tooth skipping of a chain, for example, used in a sludge scraper.

  As a conventional chain structure, there was a chain structure 2 for a sludge scraper having a drive sprocket 4, a chain 12, and an attachment 20, as shown in FIGS.

  As shown in FIG. 4, the drive sprocket 4 of the conventional chain structure 2 includes a pair of disc-shaped side plate portions 5 and 6 disposed so as to face each other in the axial direction, and the axial direction thereof. Both end surfaces of the side plate portions 5 and 6 are fixed to the surfaces of the side plate portions 5 and 6 facing each other, and the external dimensions thereof are smaller than the external dimensions of the pair of side plate portions 5 and 6, and have a low columnar shape. It has a main body 8.

  As shown in FIG. 4, a round bar-like chain engaging member 10 (pin) is attached to the drive sprocket 4 so that both end portions in the axial direction are spanned between the side plate portions 5 and 6. It was. As shown in FIG. 5, a plurality of chain engaging members 10 are attached to each other on the circumference in the vicinity of the outer peripheries of the side plate portions 5 and 6 of the drive sprocket 4 so as to be separated from each other by a predetermined pitch interval in the circumferential direction. It was.

  Such a drive sprocket 4 has a chain engaging member 10 engaged with an engaging recess 14 formed in a semicircular recess in a segment 16 of the chain 12 as shown in FIG. It was driven by a driving device such as a motor (not shown) through a rotating shaft 18 that was fitted in the hole 4a and prohibited from rotating relative to each other by the key 15, and rotated in the clockwise direction in the figure. .

  When the drive sprocket 4 is rotated, the chain 12 in which the engagement recess 14 of the segment 16 is engaged with the chain engagement member 10 of the drive sprocket 4 causes each of the segments 16 to move in the traveling direction (FIG. 5). The chain structure 2 is driven so as to rotate in the right direction (in the right traveling direction) so that the entire chain 12 moves along the length direction. Therefore, the chain structure 2 constitutes a so-called notch type chain structure. It was.

  As shown in FIG. 4, the attachment 20 of the chain structure 2 for a conventional sludge scraper has a lower end portion 20 a at the center in the width direction (left-right direction in the figure) of the outer surface 16 a of the segment 16 of the chain 12. It was supposed to be fixed. A plurality of the attachments 20 are arranged at regular intervals in the length direction of the chain 12.

  As shown in FIGS. 4 and 5, the lower end 20a of the attachment 20 is larger in the width direction than the length dimension in the width direction (left and right direction in FIG. 4) of the upper end 20b formed in a plate shape. The length dimension has become small, and the lower end part 20a of this attachment 20 was bent and formed in the L shape.

  Further, one attachment member 20c is provided at each of the four corners on the right side in FIG. 5 on the side opposite to the direction in which the lower end 20a of the upper end 20b of the attachment 20 is bent in an L shape. It was provided.

  Then, the conventional chain structure 2 for the sludge scraping machine has another drive similar to the drive sprocket 4, the chain 12, the attachment 20, etc. as described above at positions separated from each other in the direction perpendicular to the paper surface in FIG. 5. The sprocket 4, the chain 12, the attachment 20, and the like are arranged so as to face each other.

  Since the pair of drive sprockets 4 are fastened to the same rotary shaft 18, they rotate in synchronization with each other via the rotary shaft 18, and are wound around these drive sprockets 4. The pair of chains 12 hung were also moved in synchronization with each other.

  The pair of attachments 20 are configured to integrally fix plate-like flights (not shown) spanned between the respective upper end portions 20a via the respective attachment members 20c.

  For this reason, a flight (not shown) in which both end portions are fixed to the upper end portions 20a of the pair of attachments 20 moves in a direction orthogonal to its own length along with the movement of the pair of chains 12 in the length direction. With this operation, in a sedimentation tank such as a sewage treatment plant or a water purification plant, sedimented sludge or the like is raked to one side (see, for example, Patent Document 1).

  Since the sprocket 4, the chain 12, and the flight of the conventional chain structure 2 are used in water, they are generally formed of a synthetic resin material that is lightweight and excellent in corrosion resistance.

  However, when the sprocket 4, the chain 12, and the flight formed of the synthetic resin material are disposed in the water, the members are lightweight, so that buoyancy is generated and the chain 12 is easily floated. Since the engaging recess 14 is merely engaged with the chain engaging member 10 of the drive sprocket 4, there is a possibility that the engagement is disengaged (tooth skipping).

  For this reason, as shown in FIG. 4, the conventional chain structure 2 includes a pair of tooth skipping prevention mechanisms 22 fixed at positions away from the sprocket 4 on both sides in the width direction of the sprocket 4 (left and right in the figure). 24 is provided (for example, refer to Patent Document 2).

  As shown in FIG. 6B, the tooth skipping prevention mechanism 22 is formed in a quadrangular prism shape having a length in the vertical direction in the figure, and two through holes 22c spaced apart from each other are formed at the lower end portion thereof. The attached attachment member 22a and the tooth skip prevention structure 22b attached to the side surface of the upper end portion of the attachment member 22a are integrally formed.

  As shown in FIGS. 6A to 6C, the tooth skipping prevention structure 22b of the tooth skipping prevention mechanism 22 is formed in a plate shape having an arcuate portion, and the side surface of the upper end portion of the attachment member 22a is formed on one surface thereof. Is attached to the side plate portion 22e and the side plate portion 22e is bent along the arc portion of the side plate portion 22e so that one end side in the width direction of the inner arc surface (the left-right direction in FIG. 6B) is the side plate portion 22e. The curved top plate portion 22f (tooth skip prevention member) fixed on the arc surface is configured integrally.

  For this reason, the tooth skip prevention structure 22b of the tooth skip prevention mechanism 22 has a portion other than the portion fixed to the side plate portion 22e in the width direction of the arc surface inside the curved top plate portion 22f, as shown in FIG. 6B. An arc-shaped tooth skip prevention surface 22d is formed in the portion.

  The tooth skipping prevention surface 22d of the curved top plate portion 22f of the tooth skipping prevention mechanism 22 has an outer surface 16a of the segment 16 when the chain 12 moves normally without tooth skipping as shown in FIG. It was formed in the same shape as the locus drawn by the both ends, and was arranged at a position close to the shape of the locus.

  As shown in FIGS. 4 and 5, a fixing member 26 is disposed below the sprocket 4 of the chain structure 2, with one end in the length direction fixed to the wall of a sludge settling tank (not shown). It was. The fixing member 26 has a length in the direction parallel to the axial direction of the sprocket 4 and has a U-shaped cross section so that a plurality of through holes 26a spaced apart from each other are formed. It was.

  As shown in FIG. 5, the tooth skipping prevention mechanism 22 of the chain structure 2 is in a state in which the lower surface of the attachment member 22 a is in contact with the surface opposite to the side of the fixing member 26 that is open in the U shape. Then, the bolt 28 is inserted through the through hole 22c and the through hole 26a, and the nut 30 is fastened to the tip of the bolt 28, whereby the lower end portion of the mounting member 22a is integrally fixed to the fixing member 26. Has been supported.

  At this time, as shown in FIG. 4, the tooth skipping prevention mechanism 22 of the chain structure 2 has its mounting member 22a erected on the left side of the sprocket 4 so that the curved top plate portion 22f of the tooth skipping prevention structure 22b The figure of the width direction of the outer side surface 16a of the chain 12 extends outside the outer side surface 16a at both ends of the segment 16 of the chain 12 and extends from the left end side in the width direction of the chain 12 to the right end side. Only the middle left end portion is arranged so that the tooth skipping prevention surface 22d covers the contactless portion.

  Further, the tooth skip prevention mechanism 24 shown in FIGS. 7A to 7C is formed so as to be symmetrical (mirrored) with the tooth skip prevention mechanism 22 shown in FIGS. 6A to 6C. It was.

  That is, as shown in FIGS. 7A to 7C, the tooth skipping prevention mechanism 24 includes the attachment member 22a of the tooth skipping prevention mechanism 22 shown in FIGS. 6A to 6C, the tooth skipping prevention structure 22b, The mounting member 24a, the tooth skip prevention structure 24b, the through hole 24c, the tooth skip prevention surface 24d, and the side plate portion 24e, which have symmetrical shapes corresponding to the through hole 22c, the tooth skip prevention surface 22d, the side plate portion 22e, and the curved top plate portion 22f, respectively. And a curved top plate portion 24f.

  As shown in FIG. 5, the tooth skipping prevention mechanism 24 of the chain structure 2 is integrally fixed to the fixing member 26 at the lower end of the attachment member 24 a in the same manner as the attachment member 22 a of the tooth skipping prevention mechanism 22. It was supposed to be.

  At this time, as shown in FIG. 4, the tooth skipping prevention mechanism 24 of the chain structure 2 has its mounting member 24a standing on the right side of the sprocket 4, and the curved top plate portion 24f of the tooth skipping prevention structure 24b is The outer end 16a of the chain 12 extends from the right end in the width direction of the chain 12 to the left end in the width direction of the chain 12, and the right end of the outer surface 16a of the chain 12 in the width direction. The tooth skip prevention surface 24d is arranged so as to cover only the portion in a non-contact manner.

  For this reason, in the conventional sludge scraper chain structure 2, when the engagement recess 14 of the chain 12 is disengaged from the chain engagement member 10 of the drive sprocket 4 and the chain 12 attempts to float, the segment 16 of the chain 12 In order to prevent the teeth 12 from coming into contact with the tooth jump prevention surfaces 22d and 24d of the curved top plates 22f and 24f, which cover both ends in the width direction of the outer side surface 16a, to prevent the chain 12 from floating, it is possible to prevent tooth jumps from occurring. I was able to do it.

Japanese Patent No. 3969210 Japanese Patent No. 4245186

  However, the chain structure 2 for the conventional sludge scraper is a separate member, and the curved top plate portions 22f and 24f of the tooth skip prevention mechanisms 22 and 24 respectively fixed to the fixing member 26 are respectively Since the tooth skip prevention surfaces 22d and 24d cover both ends of the chain 12 in the width direction extending from the respective ends of the chain 12 in the width direction toward the center, the following problems are caused. was there.

  That is, the height position of the tooth skip prevention surface 22d of the tooth skip prevention mechanism 22 and the height position of the tooth skip prevention surface 24d of the tooth skip prevention mechanism 24 are arranged at the same position as shown in FIG. However, when the height positions of the chains 12 are shifted, the chain 12 moves in a state where one end side in the width direction of the chain 12 is lifted upward. There is a problem that the chain 12 or the attachment 20 may interfere with the tooth skipping prevention mechanism 22 or 24 to break each component, or the chain structure itself may be damaged.

  In order to prevent such a problem, the height position of the tooth skipping prevention surface 22d of the tooth skipping prevention mechanism 22 and the height position of the tooth skipping prevention surface 24d of the tooth skipping prevention mechanism 24 need to be the same. In order to make the height positions the same, the bolts 28 and the nuts 30 that fasten the lower ends of the mounting members 24a and 26a and the fixing member 26 are loosened, and the tooth skip prevention mechanisms 22 and 24 are After adjusting the position up and down, it was necessary to repeat a series of operations of fastening the nut 30 to the tip of the bolt 28 again until the height positions of the bolts 28 become the same.

  For this reason, the position adjustment work for making the height position of the tooth skipping prevention surface 22d of the tooth skipping prevention mechanism 22 the same as the height position of the tooth skipping prevention surface 24d of the tooth skipping prevention mechanism 24 requires a great amount of labor and time. There was a problem that it was expensive.

Therefore, in view of the above problems, the present invention
An object of the present invention is to provide a chain structure capable of easily attaching and adjusting the position of the chain tooth skip prevention mechanism and improving the durability thereof.

In order to solve the above problems, the chain structure according to the present invention is
A sprocket having a pin on the circumference, a chain having a recess wound around the outer periphery of the sprocket and engaged with the pin, and a tooth skip prevention mechanism for preventing the recess from being disengaged from the pin In the provided chain structure,
The tooth skip prevention mechanism is arranged outside the chain in the radial direction of the sprocket, and has only one tooth skip prevention member disposed in parallel to the width direction of the chain and close to the chain. It is characterized by this.

Moreover, the chain structure according to the present invention includes:
The tooth skip prevention member has a base end fixed at a position away from the outer side in the width direction of the sprocket, and a tip extending from the base end in the width direction of the chain has at least a center position of the width of the chain. It is characterized by being formed to extend to a position beyond it.

Moreover, the chain structure according to the present invention includes:
A flight mounting attachment is provided at a position in the width direction of the chain that is offset toward the end of the tooth skip prevention member on the front end side.

According to such a chain structure of the present invention,
A sprocket having a pin on the circumference, a chain having a recess wound around the outer periphery of the sprocket and engaged with the pin, and a tooth skip prevention mechanism for preventing the recess from being disengaged from the pin In the provided chain structure,
The tooth skip prevention mechanism is arranged outside the chain in the radial direction of the sprocket, and has only one tooth skip prevention member disposed in parallel to the width direction of the chain and close to the chain. By
The chain tooth skip prevention mechanism can be easily attached and adjusted in position, and the durability of the chain structure can be improved.

It is a front view which shows the chain structure 40 for sludge scraping machines which concerns on one embodiment of this invention. In the chain structure 40 shown in FIG. 1, a side view showing a state in which the attachment 20 comes to a portion where the tooth skip prevention mechanism 44 covers the chain 12. FIG. 3A is a left side view, FIG. 3B is a front view, and FIG. 3C is a right side view of the tooth skip prevention mechanism 44 shown in FIG. It is a front view which shows the chain structure 2 for the conventional sludge scraping machine. In the chain structure 2 shown in FIG. 4, a pair of tooth skip prevention mechanisms 22, 24 are side views showing a state in which the attachment 20 comes to a portion covering the chain 12. FIG. 6A is a left side view, FIG. 6B is a front view, and FIG. 6C is a right side view of the tooth skip prevention mechanism 22 shown in FIG. FIG. 7A is a left side view, FIG. 7B is a front view, and FIG. 7C is a right side view of the tooth skip prevention mechanism 24 shown in FIG. 4.

  Hereinafter, the form for implementing the chain structure concerning the present invention is concretely explained based on a drawing.

  FIGS. 1 to 3 are views referred to for explaining a chain structure 40 for a sludge scraper according to an embodiment of the present invention. In the chain structure 40 shown in these drawings, the same parts as those of the conventional chain structure 2 will be described with the same reference numerals, and redundant description of the same structure as the conventional one will be omitted except for a part. To do.

  In the conventional chain structure 2, as shown in FIG. 4, the lower end portion 20 a of the attachment 20 is fixed to the center portion in the width direction (left-right direction in the drawing) of the outer surface 16 a of the segment 16 of the chain 12. In contrast, in the chain structure 40 according to the present embodiment, as shown in FIG. 1, the lower end portion 20 a of the attachment 20 extends from the central portion in the width direction of the segment 16 of the chain 12 to the segment 16. It is fixed to the right end of the width direction.

  In the conventional chain structure 2, as shown in FIG. 4, attachment of the tooth skip prevention mechanisms 22, 24 having curved top plates 22 f, 24 f that cover both ends in the width direction of the chain 12. The members 22a and 24a are arranged on both outer sides in the width direction of the chain 12, whereas the chain structure 40 according to the present embodiment has a width of the chain 12 as shown in FIG. Mounting member of the tooth skipping prevention mechanism 44 having a curved top plate portion 44f (tooth skipping prevention member) that extends from the outside of the left end in the direction of the drawing and covers the range beyond the center line C in the width direction of the chain 12 44a is arranged only outside the left end of the chain 12 in the width direction in the figure.

  Then, the tooth skip prevention mechanism 44 in the present embodiment, as shown in FIGS. 3 (a) to 3 (c), has a tooth skip prevention surface 44d inside the curved top plate portion 44f of the tooth skip prevention structure 44b. The length dimension in the width direction is the tooth skipping inside the curved top plate portion 22f of the tooth skipping prevention structure 22b of the tooth skipping prevention mechanism 22 in the conventional chain structure 2 shown in FIGS. 6 (a) to (c). To prevent tooth skipping in the conventional chain structure 2 except that the length W of the prevention surface 22d in the width direction is larger than the length W by L as shown in FIG. It has the same shape as the mechanism 22.

  That is, as shown in FIG. 1, the chain structure 40 according to the present embodiment includes an attachment member 22 a and a tooth skip prevention structure 22 b of the conventional tooth skip prevention mechanism 22 shown in FIGS. The tooth skipping prevention mechanism 44 having the same shape and having the attachment member 44a and the tooth skipping prevention structure 44b shown in FIGS. 3A to 3C is used.

  As shown in FIG. 2, the tooth skipping prevention mechanism 44 of the chain structure 40 has a fixing member 26 whose lower end portion of the mounting member 44 a is the same as the lower end portion of the mounting member 22 a of the conventional tooth skipping prevention mechanism 22. It is designed to be fixed to the unit.

  At this time, as shown in FIG. 1, the tooth skipping prevention mechanism 44 of the chain structure 40 has its mounting member 44a standing on the left side of the sprocket 4, and the curved top plate portion 44f of the tooth skipping prevention structure 44b is The chain 12 extends above the outer side surface 16a of the segment 16 from the left end side in the width direction of the chain 12 to a position beyond the center line C in the width direction of the chain 12 on the right end side. Thus, the tooth skip prevention surface 44d is arranged so as to cover the range beyond the center line C in the width direction of the chain 12 in a non-contact manner.

  For this reason, in the chain structure 40 according to the present embodiment, when the engagement recess 14 of the segment 16 of the chain 12 is disengaged from the chain engagement member 10 of the drive sprocket 4 and the chain 12 is lifted, Since both ends of the outer side surface 16a come into contact with the tooth skip prevention surface 44d of the curved top plate portion 44f to prevent the chain 12 from being lifted, it is possible to prevent tooth skipping from occurring.

  Further, as shown in FIG. 1, the chain structure 40 according to the present embodiment is such that the curved top plate portion 44 f of the tooth skip prevention structure 44 b of the tooth skip prevention mechanism 44 is on the left end side in the width direction of the chain 12. Extending from the outside of the chain 12 to reach a position beyond the center line C in the width direction of the chain 12 and from the left end side in the width direction of the chain 12 to the range beyond the center line C in the width direction in a non-contact manner Since it covers, the front-end | tip part of the curved-surface top-plate part 44f of the tooth-jump prevention mechanism 44 can suppress the center part of the width direction of the chain 12 which is going to float up.

  Therefore, the curved top plate portion 44f of the tooth skip prevention mechanism 44 can prevent one side of the chain 12 in the width direction from floating upward.

  Further, in the chain structure 40 according to the present embodiment, the curved top plate portion 44f is provided beyond the center position in the width direction of the chain 12, so that the tip thereof does not interfere with the lower end portion 20a of the attachment 20. Therefore, the lower end 20a of the attachment 20 is provided not at the center position in the width direction of the chain 12 as in the conventional chain structure 2 but at the right end in FIG.

  In addition, the chain structure 40 according to the present embodiment does not need to be provided with a pair of tooth jump prevention mechanisms 22 and 24 unlike the conventional chain structure 2, and only one tooth jump prevention mechanism 44 may be provided. Therefore, the attachment can be easily performed, and the labor, time and cost for the attachment can be reduced.

  Further, the chain structure 40 according to the present embodiment does not need to be adjusted so that the height positions of the tooth skip prevention mechanisms 22 and 24 are the same as the conventional chain structure 2, and one tooth jump is not necessary. Since only the prevention mechanism 44 needs to be adjusted in position, the position can be adjusted easily, and labor, time, and cost related to the position adjustment can be reduced.

  Further, since the number of components may be small, it is possible to prevent the components from interfering with each other, so that the durability of each component, and thus the chain structure 40, can be improved.

  As described above, according to the chain structure 40 according to the present embodiment, the chain tooth skipping prevention mechanism 44 can be easily attached and adjusted in position, and the durability of the chain structure 40 can be improved. be able to.

  In the chain structure 40 according to the embodiment of the present invention, the lower end 20a of the attachment 20 is the end of the chain 12 in the width direction opposite to the end on the side where the attachment member 44a is disposed. However, the attachment member corresponding to the attachment member 44a in the above embodiment is replaced with the attachment member 44a in the above embodiment by using another tooth skip prevention mechanism symmetrical to the tooth skip prevention mechanism 44. The lower end 20a of the attachment 20 is disposed only at the end of the chain 12 in the width direction of the chain 12 where the mounting member 44a in the above-described embodiment is disposed. You may come to do.

2 Chain structure 4 Drive sprocket 4a Shaft hole 5, 6 Side plate part 8 Body part 10 Chain engaging member 12 Chain 14 Engaging recess 15 Key 16 Segment 16a Outer side face 18 Rotating shaft 20 Attachment 20a Lower end part 20b Upper end part 20c Mounting member 22 , 24 Tooth skip prevention mechanism 22a, 24a Mounting member 22b, 24b Tooth skip prevention structure 22c, 24c Through hole 22d, 24d Tooth skip prevention surface 22e, 24e Side plate portion 22f, 24f Curved top plate portion (tooth skip prevention member)
26 fixing member 26a through hole 28 bolt 30 nut 40 chain structure 42 attachment 44 tooth skip prevention mechanism 44a attachment member 44b tooth skip prevention structure 44c through hole 44d tooth skip prevention surface 44e side plate portion 44f curved top plate portion (tooth skip prevention member)
C Center line L, W Length dimension

Claims (3)

A sprocket having a pin on the circumference, a chain having a recess wound around the outer periphery of the sprocket and engaged with the pin, and a tooth skip prevention mechanism for preventing the recess from being disengaged from the pin In the provided chain structure,
The tooth skip prevention mechanism is arranged outside the chain in the radial direction of the sprocket, and has only one tooth skip prevention member disposed in parallel to the width direction of the chain and close to the chain. A chain structure characterized by that.   The tooth skip prevention member has a base end fixed at a position away from the outer side in the width direction of the sprocket, and a tip extending from the base end in the width direction of the chain has at least a center position of the width of the chain. The chain structure according to claim 1, wherein the chain structure is formed so as to extend to a position beyond it.   The chain structure according to claim 2, wherein a flight attachment is provided at a position in the width direction of the chain that is offset toward an end portion on a tip side of the tooth skipping prevention member.

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