JP2019219058A - Wheel for chain transmission device - Google Patents

Abstract

[Problem] The present invention relates to a wheel for a chain transmission device, and aims to provide a new structure that does not require a chain guard without compromising the advantages of a notched chain. [Solution] The chain has a bottom opening between a pair of plate-like parts 38 of the link, and can be driven by engaging sprocket teeth from the bottom opening of the link 16, and has notches 50 on the bottom of the link to enable engagement with a drive pin 62. The wheel has drive pins 62 arranged at equal intervals in the circumferential direction between a pair of drive pin support plates 57, 58 and at the same pitch as the chain pitch. In addition, a sprocket disk 60 is arranged between the drive pin support plates 57, 58, and has teeth 60A with the same pitch as the chain pitch on the outer periphery side of the drive pins 62, and the teeth 60A are engaged with the barrel 44 of the chain, and the drive pins 62 are engaged with the notches 50 of the chain. [Selected Figure] Figure 8

Description

  The present invention relates to a wheel for a chain transmission, and is particularly suitable for use in a sewage treatment facility such as a sludge scraper.

  In a sewerage treatment facility such as a sedimentation tank, a scraping member is stretched at a predetermined interval between a pair of parallel endless chains as a sludge scraping device, and the chain is driven to be located along the lower surface of the treatment tank. The scraping member is moved toward the sludge pit along the bottom of the processing tank, and the sludge deposited on the bottom of the processing tank can be scraped to the sludge pit. Although there is a normal sprocket engagement type as a chain (Patent Document 1), a so-called notch chain is often used recently in view of installation examples in municipal sewage facilities (Patent Document 2). The notch chain is similar to a normal sprocket chain in that a series of links are endlessly connected by connecting pins, but a notch is formed on the bottom of the link, and the drive wheel is between a pair of disks instead of the sprocket. The one provided with the drive pins equally spaced in the circumferential direction is used. The notch chain transmits power by engaging the connecting pin with the notch in the driving portion, but has a structure in which the inner peripheral abdominal surface of the link abuts on the surface of the driven wheel (sheave) in the driven portion. It is said that there is an advantage that the service life of the chain is extended as compared with the case where a normal sprocket is used because the sprocket is dispersed. On the other hand, the engagement between the drive pin and the notch in the notch chain is shallower than that of a normal sprocket, so that the notch is not detached from the drive pin at a portion of the drive wheel (so-called tooth skipping). A chain guard is installed along the outer circumference.

JP-A-11-290846 JP 2006-326483 A

  In order to prevent tooth skipping, the notch chain requires a chain guard around the outer periphery of the drive wheel. However, when used in a sewage treatment system such as a sedimentation basin, foreign matter is entangled in the drive wheel facing part (gap) of the chain guard. There were concerns. Also, the chain guard requires a mounting bracket, which complicates the structure of this part. In addition, depending on the structure of the sedimentation basin, the mounting structure is complicated, and in extreme cases, it may even be difficult.

  The present invention has been made in view of the problems of the related art, and has as its object to provide a novel structure that does not require a chain guard without deteriorating the advantages of the notch chain.

According to the present invention, it is a wheel for a chain transmission device used for a sewage treatment system,
A sprocket circle which rotates together with the rotating shaft, is arranged at the same pitch as the link pitch of the chain, and has teeth on its outer periphery which can be engaged with a barrel connecting between a pair of plate-like portions constituting each link of the chain. Board and
A drive pin arranged to be engageable in the circumferential direction of the sprocket disk at the same pitch as the pitch of the notch formed on the lower surface of the pair of plate-like portions constituting each link of the chain ;
Rotating with the rotating shaft, the toothed portion is positioned on both sides of the sprocket disk so as to sandwich each of the pair of plate-shaped portions of the chain with the sprocket disk in the engaged state with the barrel or the notch of the drive pin, And an annular plate arranged so as to overlap with the plate-like portion of the chain,
Ri formed comprises a drive pin chain drive wheel which is located radially inward of the convex outer surface of the teeth adjacent are provided.

  ADVANTAGE OF THE INVENTION According to this invention, the wheel for chain transmission devices is provided with the drive pin and the tooth | gear part of the pitch according to the chain pitch, and can perform reliable power transmission by using the notch part and the drive pin on the drive side in a chain. In addition, a chain guard is not required, and a sheave wheel can be used on the driven side in addition to a normal sprocket, so that the advantage of the notch chain is not lost.

FIG. 1 is a sectional view of each part of a chain using a wheel according to the present invention before connection of adjacent links. FIG. 2 is a front view of a connecting pin, which is a component of the chain of FIG. 1, and is a view taken along the line II-II of FIG. FIG. 3 is a front view of a locking ring which is a component of the chain of FIG. 1, and is a view taken along the line III-III in FIG. FIG. 4 is a front view of a lock piece, which is a component of the chain of FIG. 1, and is a view taken along the line IV-IV of FIG. FIG. 5 is a sectional view of the assembled state of the chain of FIG. FIG. 6 is a side view of a link (plate-like portion) which is a component of the chain of FIG. 1 and is a view taken along the line VI-VI of FIG. FIG. 7 is a front view of the wheel 6 of the present invention in an engaged state with the chain of FIGS. 1 to 6, and is a view taken along the line VII-VII of FIG. FIG. 8 is a cross-sectional view of the wheel of FIG. 7, and is a view taken along an arrow line VIII-VIII of FIG. FIG. 9 is a diagram showing the engagement state of the wheel of the present invention with the drive pin and the tooth portion in the chain, and is a diagram viewed from the IX direction in FIG.

  FIG. 1 shows a chain used in the chain transmission of the present invention in a state where adjacent links are disassembled. All parts of the chain are molded products of synthetic resin, and the connecting pin 10, the locking ring 12, and the lock piece 14 are basic components. The connection pin 10 includes a shaft 18, a head 20 at one end of the shaft 18, and a reduced diameter portion 22 at the other end of the shaft 18. The head 20 has a two-sided width as shown in FIG. A pair of locking projections 24 extending in the radial direction until the outer diameter of the shaft portion 18 is flush with the outer diameter of the shaft portion 18 are formed on the reduced diameter portion 22 of the connecting pin at positions opposite in diameter (see FIG. 5). Each locking projection 24 extends from the end face of the connecting pin 10 along the axis, but terminates at some distance from the shaft 18.

  As shown in FIG. 3, the locking ring 12 has a pair of insertion grooves 29 diametrically opposed to each other and extending in the entire axial length on the inner periphery thereof, and a bottomed locking groove formed at an intermediate position between the grooves 29. 30. The grooves 29, 30 have a width that allows the locking projection 24 of the connecting pin 10 to be freely inserted in the axial direction without substantial play. The insertion groove 29 extends the entire length in the axial direction, but the locking groove 30 terminates halfway in the axial direction from the outer surface of the locking ring 12 (FIG. 1).

  As shown in FIG. 4, the lock piece 14 is formed by cutting off a ring whose inner diameter R is somewhat larger than the outer diameter of the reduced diameter portion 22 of the connecting pin 10 at a portion 14A of about 30 degrees in the circumferential direction. Therefore, the lock piece 14 exhibits the forked portion 32 when viewed from the front. Since the cutout portion 14A has a central angle of about 30 degrees, the connection pin 10 is mounted on the reduced-diameter portion 22 by elastically deforming the forked portion 32. After the mounting, the forked portion 32 is elastically deformed. And the distal end of the forked portion 32 becomes a protruding portion radially inward with respect to the outer diameter of the connecting pin (outer diameter of the reduced diameter portion 22), and the engagement state with the reduced diameter portion 22 is reduced by its elasticity. To maintain. Further, the distal end 32A of the forked portion 32 is tapered as shown in FIG. 1, so that the operation of inserting the lock piece 14 is smooth. The lock piece 14 is provided with an overhang portion 34 on the outer periphery at a position opposite to the cutout portion 14A in diameter, and the overhang portion 34 protrudes in the radial direction. However, the outer surface side slightly protrudes outward in the axial direction, and an engagement hole 36 with the punching tool is formed in the axially protruding portion.

  As shown in FIG. 1, each link 16 includes a pair of plate-shaped portions 38, each of which has a narrowed portion 38-1 and a widened portion 38-2, and the pair of plate-shaped portions 38 has a narrowed portion. The portion 38-1 and the expanding portion 38-2 are arranged so as to face each other, and the connecting pin insertion holes 40 and 42 which are aligned with each other are formed. A barrel 44 (cylindrical portion) is integrally formed between the constricted portions 38-1 of the pair of plate portions 38 so as to be aligned with the connection pin insertion hole 40. A gap S is formed between the pair of plate-shaped portions 38 and extends from the barrel to the opposing enlarged portion 38-2, and the narrowed portion 38-1 of the link 16 adjacent to the gap S is inserted as shown in FIG. The connection pin insertion holes 40 and 42 are aligned between the adjacent links 16. Then, the connection pin 10 is inserted into the pin insertion holes 42, 40 on one side, the barrel 44, and the pin insertion holes 40, 42 on the opposite side from the reduced diameter portion 22 via the spacer 46, and the head 20 of the connection pin 10 Is in contact with the side surface of the outer plate-shaped portion 38 facing thereto, and the tip of the connecting pin 10 projects from the side surface of the opposite plate-shaped portion 38.

  The other spacer 48 is inserted into the tip of the connection pin 10 protruding from the side surface of the plate-shaped portion 38, and then the locking ring 12 is inserted. At this time, by aligning the insertion groove 29 of the locking ring 12 with the locking projection 24, the locking ring 12 can be inserted until it is completely removed from the locking projection 24 of the connecting pin 10. Then, by turning the locking ring 12 by 90 degrees with respect to the connecting pin 10 and moving the locking ring 12 on the connecting pin 10 so as to be pulled outward in the axial direction, the locking projection 24 of the connecting pin 10 is moved. The locking ring 12 can be engaged with the locking groove 30 having the bottom. Then, the lock piece 14 is radially moved so that the forked portion 32 straddles the reduced diameter portion 22 of the connecting pin 10 and the tapered tip 32A of the forked portion 32 is located between the spacer 48 and the locking ring 12. Attached from the outside. By appropriately setting the thickness of the forked portion 32 with respect to the gap between the link 38 and the opposing surface of the spacer 48, the lock piece 14 can be smoothly mounted on the gap. Therefore, the engagement state between the locking projection 24 and the locking groove 30 can be maintained. When the lock piece 14 is mounted, the distal end of the forked portion 32 first comes into contact with the reduced diameter portion 22 of the connecting pin 10 in the cutout portion 14A, but the lock piece 14 is hit with a tool such as a plastic hammer at the overhang portion 34 thereof. Thus, the forked portion 32 is expanded against its elasticity, the forked portion 32 is passed through the connecting pin 10, and the forked portion 32 returns to its original state by the elasticity. The insertion of the lock piece 14 simultaneously displaces the locking ring 12 to the outside in the axial direction by the thickness of the locking piece 14, which is caused by the locking projection 24 of the connecting pin 10 and the locking groove 30 having the bottom of the locking ring 12. (Do not loosen in the axial direction). Therefore, when the lock piece 14 is mounted, the engagement between the locking projection 24 and the locking groove 30 is firmly maintained. When the fork portion 32 returns to its original position due to elasticity, the lock piece 14 is engaged with the reduced-diameter portion 22 of the connecting pin 10 over the entire circumference except for the 30-degree notch 14A. Does not come off, and the adjacent link 16 is maintained in a connected state by the connecting pin 10. FIG. 5 shows a state in which the connection of the adjacent link 16 has been completed by the connection pin 10.

  As can be seen from FIGS. 1 and 5, in the state where one link 16 is connected to the adjacent link 16 by the connecting pin 10, a gap S is formed between a pair of plate-shaped portions 38 of the one link 16, In this embodiment, S is opened vertically, and the tooth portion of the wheel driving the chain is located in the gap S as described later. The gap S may have a closed upper surface as long as the teeth can be engaged between the plate-shaped portions 38 in view of the function of engaging the teeth with the wheel described later. FIG. 6 is a side view of one of the links 16, and the bottom surface of the plate portion 38 has a notch 50 between the connecting pin insertion hole 42 and the barrel 44, and the notch 50 is used to drive the chain drive wheel of the present invention. It is a pin engaging portion. The notch 50 has a substantially inverted V-groove shape with a relatively steep front surface and a loose rear surface, and the bottom surface 38A of the plate-shaped portion 38 before and after the notch 50 has a somewhat concave surface. In the case where the driven wheel in the chain transmission system is a sheave wheel, when the chain is wound around the peripheral surface of the sheave wheel, the bottom surface 38A of the plate portion 38 of the adjacent link smoothly follows the peripheral surface shape of the sheave wheel. It has a very concave shape.

  7 to 9 show a chain transmission wheel 52 according to the present invention, which is used on the drive side in the chain transmission. The chain transmission wheel or assembly 52 sequentially or simultaneously performs transmission by the teeth of the conventional sprocket chain transmission and transmission by the drive pins of the notch chain transmission. That is, in the chain transmission wheel 52, as shown in FIG. 8, a disk-shaped support body 54 has a rotation shaft 56 inserted into a central hub portion 54-1 thereof, and the support body 54 and the rotation shaft 56 are keyed. Are fixed by appropriate means. On both sides of the support body 54, annular drive pin support plates 57, 58 are arranged concentrically with the rotation shaft 56. An annular sprocket disk 60 is positioned adjacent to the support body 54, and the sprocket disk 60 has teeth (sprocket) 60A arranged on the outer circumference at equal pitches in the circumferential direction at a pitch equal to the link pitch of the chain. . The drive pins 62 are arranged at equal intervals in the circumferential direction at a pitch equal to the link pitch of the chain on the inner side of the tooth portion 60A. Is provided with a reduced screw portion 62-1. The screw portion 62-1 protrudes outward from the shaft on both sides from openings formed in the drive pin support plates 57, 58. The bolt 66 has a spacer 64 interposed between the drive pin support plate 58 and the sprocket disk 60 and a spacer 63 interposed between the support body 54 and the drive pin support plate 57, respectively. 58, a sprocket disk 60, a support main body 54 and a drive pin support plate 57 are inserted in this order, and a nut 68 is screwed into an end of a bolt 66 protruding from the drive pin support plate 57. In addition, a nut 70 is screwed and fastened to a screw portion 62-1 protruding from the drive pin support plates 57, 58, and is used as a wheel that can be used on the drive side in a chain transmission including the chain of FIGS. Assembled.

  The wheel of the present invention can be used as a driving wheel in a chain transmission system composed of the chains of FIGS. 1 to 6, and when the chain goes around the wheel in the rotation direction a of the wheel in FIG. The tooth portion 60A of 60 enters the gap S between the pair of plate-like portions 38 of the link 16 forming the chain, and the tooth portion 60A has its front edge 60A-1 in the rotation direction engaged with the barrel 44 (see also FIG. 9). ). Then, in addition to the engagement of the tooth portion 60A with the barrel 44, the drive pin 62 is engaged with the notch 50 on the bottom surface of the pair of plate portions 38 in the link 16 forming the chain. Since the engagement between the tooth portion 60A and the barrel 44 and the engagement between the drive pin 62 and the notch 50 occur sequentially or simultaneously to transmit power from the wheel to the chain, it is necessary when only the notch is used. Although the installation of the chain guard is unnecessary, reliable power can be provided.

  On the driven side in the chain transmission system, a normal sprocket or sheave wheel may be used. In the case of a normal sprocket, the teeth on the outer periphery of the sprocket enter the gap S between the pair of plate-like portions 38 of the link 16 constituting the chain and engage with the barrel 44. In the case of a sheave wheel, when the chain goes around the sheave wheel, the concatenation of the concave surfaces of the bottom surfaces 38A of the pair of plate-shaped portions 38 constituting the link of the chain contacts the outer periphery of the sheave wheel so as to follow this. A smooth movement of the chain is obtained.

10 connecting pin 16 link 38 plate-shaped part
40, 42 ... connecting pin insertion hole 38 ... plate-shaped portion 38A ... link bottom surface 44 ... barrel 50 ... notch 52 ... chain transmission wheel 54 ... support body 56 ... rotating shaft
57, 58: drive pin support plate 60: sprocket disk 60A: tooth portion 62: drive pin

Claims (1)

A chain transmission wheel used for a sewage treatment system,
A sprocket circle which rotates together with the rotating shaft, is arranged at the same pitch as the link pitch of the chain, and has teeth on its outer periphery which can be engaged with a barrel connecting between a pair of plate-like portions constituting each link of the chain. Board and
A drive pin arranged to be engageable in the circumferential direction of the sprocket disk at the same pitch as the pitch of the notch formed on the lower surface of the pair of plate-like portions constituting each link of the chain ;
Rotating with the rotating shaft, the toothed portion is positioned on both sides of the sprocket disk so as to sandwich each of the pair of plate-shaped portions of the chain with the sprocket disk in the engaged state with the barrel or the notch of the drive pin, And an annular plate arranged so as to overlap with the plate-like portion of the chain,
Ri formed comprises a drive pin chain drive wheel which is located radially inward of the convex outer surface of the teeth close.

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