Non-metallic conveyor chain with improved durability and sludge removal facility comprising said non-metallic conveyor chain

Abstract

The aim of the invention is to improve the chain link structure of a non-metallic conveyor chain and to increase the shear strength of said chain used in a sludge removal facility, thereby improving the durability of said non-metallic conveyor chain. To this end, the present invention provides, as a conveyor chain for a sludge collector, a non-metallic conveyor chain having improved durability, the conveyor chain comprising a plurality of unit chains and chain pins, the unit chains being connected to each other by means of the chain pins, in which each of the unit chains is provided with a cylinder on one side thereof and a yoke on the other side thereof, the cylinder of the unit chain is formed on an outer surface thereof with a chain pocket having a groove structure, and the yoke of the unit chain is formed on an inner surface thereof with a chain boss protruding so as to correspond to the chain pocket of the unit chain to which the chain boss is to be joined.

Description

Technical Field

[0001] The present invention relates to a non-metal conveyor chain and a sludge removal facility including the non-metal conveyor chain, and more particularly, to a technology for improving the durability of the non-metal conveyor chain applied to the sludge removal facility by improving the chain link structure of the non-metal conveyor chain. Background Art

[0002] Various organic and inorganic substances exist in raw water introduced into sewage treatment plants and wastewater treatment plants, and are introduced into the treatment plants together with various floating solids to carry out the sewage treatment process.

[0003] In a typical sewage treatment process, sand and floating solids contained in the influent sewage are removed in the influent tank, and then sequentially subjected to gravity sedimentation in the primary sedimentation tank, biodegradation in the bioreactor where organic matter is decomposed by microorganisms, and the supernatant water that has passed through the bioreactor is re-precipitated in the secondary sedimentation tank to remove floating solids. The supernatant water is then sent to the final total phosphorus treatment facility for further clarification and finally discharged after sterilization.

[0004] In such a treatment process, a first sedimentation tank corresponding to a primary sedimentation tank and a second sedimentation tank corresponding to a final sedimentation tank are provided with a scum skimmer for removing scum and a sludge collector for removing settled sludge.

[0005] refer to Figure 1 The sedimentation tank 1 is usually provided with a sludge collector 5 for scraping off the sludge on the bottom and sending the sludge to the hopper H for sludge discharge, and a scum skimmer device 2 for skimming floating materials such as scum and plastic materials on the sewage and discharging the floating materials through a trough T.

[0006] In addition, an upper layer clean water discharge passage 120 is disposed at the rear of the installation area of ​​the scum skimmer device 2 to discharge the upper layer clean water passing through the scum skimmer device 2 to the outside of the sedimentation tank 1 .

[0007] Here, the sludge collector 5 includes: a collector drive motor 51, a head shaft 52 arranged to rotate in response to transmitting a driving force when driving the collector drive motor 51, and an idle shaft 53, a winding shaft 54 ​​and an angle shaft 55 arranged in sequence to rotate in association with the rotation of the head shaft 52, a main chain 56 around which these shafts are wound to transmit the rotational force to the idle shaft 53, the winding shaft 54 ​​and the angle shaft 55 when the head shaft 52 rotates, and a plurality of scrapers 57 arranged on the main chain 56 in the length direction of the main chain 56.

[0008] In the operation of the sludge collector 5, when the driving force of the collector driving motor 51 is transmitted to the head shaft 52 through the chain of the head shaft for driving the sprocket wound around the axis of the head shaft 52 coupled to the axis of the head shaft 52 to rotate the head shaft 52, the main chain 56 wound around the head shaft 52, the idle shaft 53, the winding shaft 54 ​​and the angle shaft 55 rotates these shafts while moving along a predetermined track.

[0009] When the main chain 56 rotates in this manner, the scrapers 57 arranged at regular intervals on the main chain 56 scrape the sludge from the bottom of the sedimentation tank 1 while pushing the scum and floating solids toward the skimmer on the water surface. Then, the sludge scraped from the bottom of the sedimentation tank 1 by the scrapers 57 falls into the hopper H and is then discharged, while the scum and floating solids pushed to one side of the scum skimmer on the water surface by the scrapers 57 are sent to the trough placed on the beach board by the removal action through the rotation of the scum skimmer of the scum skimmer device 2 and are then discharged.

[0010] Then, after passing through the scum skimmer device 2, the upper layer of clean water is discharged to the outside of the sedimentation tank 1 through the weir 120 constituting a drainage path.

[0011] That is, the sludge collector consists of two rows of chains wound in the form of an endless track in the length direction of the sedimentation tank, wherein scrapers are attached to the chains so as to be arranged at regular intervals in the width direction of the sedimentation tank, and when the chains provided in the form of an endless track are driven by sprockets through the transmission of power, the sludge settled on the bottom by gravity sedimentation is transferred to a hopper by the scrapers attached to the chains at regular intervals.

[0012] A so-called chain-scraper type sludge collector in which sludge is transferred by a scraper attached to a chain is provided with a conveyor chain as a means for moving the scraper.

[0013] Since the size of the sedimentation tank is not standardized for each sedimentation capacity, the width of the sedimentation tank varies from 16m to 2m, and the length varies from 15m to 120m. Therefore, the height of the scraper varies from 150mm to 360mm and has various lengths matching the width of the sedimentation tank.

[0014] In addition, conveyor chains made of cast iron or stainless steel are generally used in the past. However, considering the total length of the chain depending on the sedimentation capacity, too much power is required to drive the chain, and when the entire chain is formed of metal, the maintenance of the conveyor chain is inconvenient due to the high load (e.g., 19 tons). Therefore, in recent years, in order to solve these problems, non-metallic conveyor chains made of composite materials or high-strength engineering plastics are being applied.

[0015] On the other hand, a two-row chain scraper type sludge collector having two rows of chains is most commonly used in small sedimentation tanks. In this type of sludge collector, scrapers are assembled to two rows of chains spaced apart from each other so as to collect sludge while moving with the chains.

[0016] Therefore, although small sedimentation tanks do not suffer major problems in chain-scraper type operation, large sedimentation tanks with a width ranging from 7m to 15m and a length ranging from 20m to 120m may be frequently damaged in chain-scraper type operation due to frequent breakage of the chain and sagging of the scraper. Therefore, various attempts have been made to solve such problems.

[0017] For example, in an attempt to prevent damage due to sagging of the scraper, the applicant's Korean Patent No. 10-2169694 (title: Chain-flight type sludge collector with reinforced flights) discloses a technology that solves this problem by reinforcing the scraper.

[0018] In other words, Korean Patent No. 10-2169694 discloses a technology capable of effectively preventing a blade from being bent, deformed, or broken depending on the amount of sagging at the center of the blade due to the sludge load when the blade moves when collecting sludge.

[0019] On the other hand, among the main components of the sludge collector 5, namely, the drive unit, sprocket, conveyor chain and scraper, the conveyor chain requires high strength and durability according to the specifications of the sedimentation tank, and considering the maintenance and assembly of the chain, the yoke and the cylinder are usually moved and assembled in the horizontal direction when connecting the chain links.

[0020] In other words, Figure 2A and Figure 2B As shown, a typical conveyor chain includes a yoke, a cylinder and a chain pin. In addition, a conveyor chain consisting of linked unit chains has accessories (see Figure 4 ) for installing scrapers at regular intervals.

[0021] In addition, when connecting the chain links, the cylinder 101 of one chain and the yoke 102 of the other chain of the two unit chains to be connected to each other are arranged to face each other (see Figure 2A ).

[0022] Then, Figure 2A The state shown is that the cylinder 101 is placed inside the yoke 102, and the steel sleeve integrated chain pin 11 is inserted into the yoke and the cylinder to connect the two unit chains 10 (see Figure 2B ).

[0023] However, a conveyor chain having a typical chain link structure is placed in a sedimentation tank and subjected to tensile force, and the tensile force applied to the chain acts as a shear load on the chain pin 11, which has no structure capable of dispersing the shear load concentrated thereon and thus bears the entire shear load.

[0024] Therefore, there are the following problems in the related art: Figure 3A The chain pin may break, or Figure 3B and Figure 3C , the yoke 102 or barrel 101 near the chain pin may break due to stress concentration thereon.

[0025] Since the breakage of the chain or chain pin caused by the chain link structure of such a typical conveyor chain requires not only cost losses due to the maintenance of the conveyor chain, but also social and economic losses due to the treatment failure of raw water in the sedimentation tank, it is necessary to develop a technology that can solve this problem. Summary of the invention

[0026]

Technical issues

[0027] The present invention has been made to solve the above-mentioned problems, and an object thereof is to improve the durability of a non-metal conveyor chain applied to a sludge removal facility by increasing the shear strength of the non-metal conveyor chain by improving the chain link structure of the non-metal conveyor chain.

[0028] In other words, the object of the present invention is to provide a non-metallic conveyor chain and a sludge removal plant comprising the same, wherein the non-metallic conveyor chain has improved durability by increasing its shear resistance by allowing the shear loads borne by the chain pins due to the tensile loads applied to the chain in the sedimentation tank to be distributed to the barrel and yoke of the chain surrounding the chain pins.

[0029]

Technical Solution

[0030] According to one aspect of the present invention, there is provided a non-metallic conveying chain with improved durability for a sludge collector, the non-metallic conveying chain comprising a plurality of unit chains and chain pins, the unit chains being connected to each other by the chain pins, wherein each of the unit chains is provided with a barrel on one side thereof and a yoke on the other side thereof, the barrel of the unit chain being provided with a chain pocket having a groove structure on its outer surface, and the yoke of the unit chain being provided with a chain boss on its inner surface, the chain boss protruding so as to correspond to the chain pocket of the unit chain to which the chain boss is to be connected.

[0031] The chain pocket may include a protective rim spaced apart from the pin hole of the barrel and formed in a predetermined area along a circumference of the pin hole, and an opening serving as a passage through which the chain boss is inserted into the chain pocket to be placed in the chain pocket.

[0032] An entrance width of the opening may be greater than or equal to an outer diameter of the chain boss.

[0033] The chain pocket may further include a guide having a flat surface that guides the chain boss inserted into the chain pocket through the opening to move from a side of an entrance of the opening to an inner surface of a side of the protection rim, the guide constituting the chain pocket together with the protection rim.

[0034] An inner surface of the chain pocket may be formed to have a gradient in a depth direction of the chain pocket such that the chain pocket has a diameter that increases with depth into the chain pocket.

[0035] According to another aspect of the present invention, a non-metallic conveying chain with improved durability for a sludge collector is provided, the non-metallic conveying chain comprising a plurality of unit chains and chain pins, the unit chains being connected to each other by the chain pins, wherein each of the unit chains is provided with a barrel on one side thereof and a yoke on the other side thereof, the barrel of the unit chain being provided with a chain recess on its outer surface, and the yoke of the unit chain being provided with a chain recess on its inner surface, the chain recess being recessed to correspond to the chain boss of the unit chain to which the chain recess is to be connected.

[0036] A maximum width between chain bosses formed at opposite sides on the outer surface of the barrel may be greater than an inner width of the yoke into which the barrel is inserted.

[0037] A front region of the chain boss in the insertion direction of the barrel may be gradually lowered in a forward direction so as to facilitate insertion of the barrel into the yoke when assembling the barrel and the yoke.

[0038] The chain pin may include a steel reinforced plastic (SRP) chain pin made of SRP.

[0039] According to another aspect of the present invention, there is provided a sludge removal facility, comprising: a sedimentation tank into which raw water is introduced; and a sludge collector configured to scrape sludge from the bottom of the sedimentation tank and discharge the sludge from the sedimentation tank, wherein the sludge collector is provided with a non-metallic conveyor chain according to any one of claims 1 to 8 to convey scum pushed by the operation of a scraper constituting the sludge collector from the water surface of the sedimentation tank to a trough for discharge.

[0040]

Beneficial effects

[0041] The present invention can improve the durability of non-metallic conveyor chains by increasing the shear resistance of the non-metallic conveyor chain by allowing the shear loads borne by the chain pins due to the tensile loads applied to the chain in the settling tank to be distributed to the barrel and yoke of the chain surrounding the chain pins.

[0042] That is, according to the present invention, the chain pockets on the outer surface of the barrel engage with the chain bosses on the inner surface of the yoke to reduce shear stress together with the chain pins, thereby increasing the life of the non-metallic conveyor chain by improving its durability.

[0043] In addition, according to the present invention, by applying high-strength steel reinforced plastic (SRP) technology to chain pins constituting a chain link structure, wherein each chain pin is inserted into a stainless steel tube, compared with the existing chain link structure, maintenance costs and operating costs can be reduced by significantly increasing the durability and tensile strength of the conveyor chain, and microplastic elution can be reduced by protecting the conveyor chain from wear caused by sand and sludge.

[0044] As described above, the present invention improves the durability and life of the non-metallic conveyor chain by improving the chain link structure of the non-metallic conveyor chain, thereby not only reducing the cost losses of replacement and maintenance due to chain breakage occurring in typical conveyor chains, but also promoting economic improvements in the operation of sludge removal facilities by preventing social and economic losses due to treatment failure of raw water in sedimentation tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a partially cutaway perspective view of an example of a sludge removal facility.

[0046] Figure 2A and Figure 2B This is a partial cutaway plan view illustrating the assembly process of a typical conveyor chain link.

[0047] Figure 2A Show the state before assembly.

[0048] Figure 2B Show the assembled state.

[0049] FIG. 3A to FIG. 3C It is a reference view for explaining the problems of the chain link structure of the existing non-metallic conveyor chain.

[0050] Figure 4 is a perspective view of a link structure of a conveyor chain according to a first embodiment of the present invention.

[0051] Figure 5 yes Figure 4 An exploded perspective view of portion A of FIG.

[0052] Figure 6 yes Figure 4 A cross-sectional view of portion 'A' of FIG. 1 showing a chain boss formed in a yoke and inserted into a chain pocket formed in a barrel of a conveyor chain.

[0053] Figure 72 is an exploded perspective view of a link structure of a conveyor chain according to a second embodiment of the present invention.

[0054] Figure 8 According to the second embodiment of the present invention, Figure 7 Cross-sectional view of the link structure of a conveyor chain.

[0055] Fig. 9 4 is an exploded perspective view of a link structure of a conveyor chain according to a third embodiment of the present invention.

[0056] Fig.10 According to the third embodiment of the present invention Fig. 9 A cross-sectional view of the link structure of a conveyor chain is shown in FIG.

[0057] Fig.11 yes Fig. 9 A plan view of the tube shown in FIG.

[0058] Fig.12 Yes Description Fig. 9 A view of the range of guide slopes in the chain bosses of the drum shown in FIG.

[0059] Fig.13 4 is an exploded perspective view of a link structure of a conveyor chain according to a fourth embodiment of the present invention.

[0060] Fig.14 is a perspective view of a chain pin made of steel reinforced plastic (SRP) as another embodiment of a chain pin according to the present invention.

[0061] Fig.15 yes Fig.14 Exploded perspective view of. DETAILED DESCRIPTION

[0062] [Best Mode]

[0063] The objects, features and advantages of the present invention will be understood through the detailed description of the embodiments with reference to the accompanying drawings.

[0064] However, it should be understood that the present invention is not limited to the following embodiments and can be embodied in many different ways, and these embodiments are provided to make the disclosure of the present invention complete and to enable those skilled in the art to fully understand the scope of the present invention.

[0065] Therefore, it should be understood that the embodiments described herein and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all technical concepts of the present invention, and that various equivalents and modifications that can replace these embodiments may exist when the present invention is submitted.

[0066] [Example 1]

[0067] First, refer to Figures 4 to 6 A first embodiment of the present invention is described.

[0068] Figure 4 is a perspective view of a connecting rod structure of a conveyor chain according to a first embodiment of the present invention, Figure 5 yes Figure 4 an exploded perspective view of a portion A of Figure 6 yes Figure 4 A cross-sectional view of a portion 'A' of FIG. 1 showing a chain boss formed on a yoke and inserted into a chain pocket formed on a cylinder of a conveyor chain.

[0069] In the following, reference Figures 4 to 6 , the link structure of the conveyor chain of the first embodiment of the present invention will be described.

[0070] According to the first embodiment, the conveyor chain for the sludge collector includes a plurality of unit chains 10 and chain pins 11 inserted into pin holes 101 a , 102 a to mediate a link group between the unit chains 10 .

[0071] The unit chain 10 is provided with a cylinder 101 on one side thereof and a yoke 102 on the other side thereof, wherein each of the cylinders 101 of the unit chain 10 is formed with a chain pocket CP having a groove structure on its outer surface, and each of the yokes 102 of the unit chain 10 is formed with a chain boss CB on its inner surface, the chain boss CB protruding so as to correspond to the chain pocket CP of the unit chain 10 to which the chain boss is to be connected.

[0072] Here, each of the chain pockets CP includes a protective rim SR that is spaced apart from the pin hole 101a of the cylinder 101 and formed in a predetermined area along the circumference of the pin hole 101a, an opening CPO that serves as a passage through which the chain boss CB is inserted into the chain pocket CP to be placed in the chain pocket CP, and a guide member CPG having a plane of an inner surface that guides the chain boss CB inserted into the chain pocket CP through the opening CPO to move from one side of the entrance of the opening CPO to one side of the protective rim SR.

[0073] That is, the guide CPG includes a vertical surface, thereby constituting a chain pocket CP together with the protective rim SR and the opening CPO.

[0074] In addition, the entrance width of the opening CPO is greater than or equal to the outer diameter of the chain boss CB.

[0075] By virtue of this structure, the non-metal conveyor chain according to the first embodiment of the present invention has the following effects.

[0076] In the link structure of the conveyor chain according to this embodiment, the shear load applied to the chain in the sedimentation tank is borne by the chain pin 11 together with the cylinder 101 and the yoke 102 surrounding the chain pin 11, thereby improving the durability of the non-metallic conveyor chain by increasing its shear resistance.

[0077] That is, in a typical conveyor chain link structure, a tensile load applied to the chain in a settling tank is borne only by the chain pin 11 and causes breakage of the yoke 102, the barrel 101, or the chain pin 11, thereby providing unsatisfactory durability.

[0078] However, according to this embodiment, the shear load applied to the chain in the settling tank is borne together by the cylinder 101 and yoke 102 of the chain surrounding the chain pin 11, thereby improving the durability of the conveyor chain by increasing the shear resistance of the non-metal conveyor chain.

[0079] That is, according to the present invention, the chain pockets CP on the outer surface of the barrel 101 engage with the chain bosses CB on the inner surface of the yoke 102 to reduce shear stress together with the chain pin 11, thereby improving the life of the non-metallic conveyor chain and other facilities including the non-metallic conveyor chain by improving the durability of the non-metallic conveyor chain.

[0080] [Example 2]

[0081] Next, refer to Figure 7 and Figure 8 , a second embodiment of the present invention will be described.

[0082] Figure 7 is an exploded perspective view of a connecting rod structure of a conveyor chain according to a second embodiment of the present invention, and Figure 8 According to the second embodiment of the present invention Figure 7 A cross-sectional view of the link structure of a conveyor chain is shown in FIG.

[0083] refer to Figure 7 and Figure 8 The basic structure of the conveyor chain according to the second embodiment is the same as the basic structure of the conveyor chain according to the first embodiment, except that a gradient is formed on the matching surfaces of the chain pockets CP and the chain bosses CB.

[0084] That is, the conveyor chain for a sludge collector according to this embodiment further includes a plurality of unit chains 10 and chain pins 11 inserted into the pin holes 101 a , 102 a to mediate a link group between the unit chains 10 .

[0085] Here, the unit chain 10 is provided with a cylinder 101 on one side thereof and a yoke 102 on the other side thereof, wherein each of the cylinders 101 of the unit chain 10 is formed with a chain pocket CP having a groove structure on its outer surface, and each of the yokes 102 of the unit chain 10 is formed with a chain boss CB on its inner surface, the chain boss CB protruding so as to correspond to the chain pocket CP of the unit chain 10 to which the chain boss is to be connected.

[0086] In addition, each of the chain pockets CP includes a protective rim SR that is spaced apart from the pin hole 101a of the cylinder 101 and formed in a predetermined area along the circumference of the pin hole 101a, an opening CPO that serves as a passage through which the chain boss CB is inserted into the chain pocket CP to be placed in the chain pocket CP, and a guide member CPG having a plane of an inner surface that guides the chain boss CB inserted into the chain pocket CP through the opening CPO to move from one side of the entrance of the opening CPO to one side of the protective rim SR.

[0087] Here, the guide CPG according to this embodiment together with the protective rim SR and the opening CPO constitutes a chain pocket CP, wherein the guide surface of the guide CPG and the inner surface of the protective rim SR are configured to have a gradient. Therefore, the inner surface of the chain pocket CP generally has a diameter that gradually increases from the outer side of the pocket to the inner side of the pocket in the depth direction of the pocket.

[0088] In other words, the inner surface of the protection rim SR constituting the chain pocket CP and the guide surface of the guide CPG form a gradient in the depth direction of the chain pocket CP so that the chain pocket CP has a diameter that increases with the depth into the chain pocket CP.

[0089] According to the second embodiment having such a structure, the chain pocket CP is provided on one side thereof with a guide CPG including a guide surface having a gradient for efficiently assembling the chain boss CB of the yoke 102, which is inserted through the opening CPO corresponding to the area where the chain pocket CP is not formed.

[0090] On the other hand, the inner surface of the protection rim SR and the inner surface of the guide CPG have a gradient so that the chain pocket CP has an area gradually increasing toward the bottom surface of the chain pocket CP, and the outer surface of the chain boss CB has a gradient corresponding thereto.

[0091] In the structure of this embodiment, the matching surface of the chain boss CB or the chain recess CP has a gradient, thereby preventing the yoke from spreading.

[0092] That is, the gradient formed in the chain boss CB and the chain pocket CP constitutes the hook CPH, thereby more effectively preventing the conventional phenomenon of bending the chain pin 11 and allowing the yoke to expand when the chain is subjected to a tensile load.

[0093] More specifically, in the related art, when the chain pin 11 tends to bend due to the tensile load applied by a typical conveyor chain, the yoke 102 may be easily expanded in the axial direction of the chain pin 11. However, according to this embodiment, each of the chain boss CB and the chain pocket CP has a gradient forming a hook CPH, and serves to prevent the yoke 102 from expanding due to interference with the axial movement of the chain pin 11.

[0094] Therefore, even when the conveyor chain is subjected to a tensile load that forces the chain pins 11 to bend, the yoke 102 can be effectively prevented from unfolding, thereby further preventing the chain from breaking.

[0095] [Example 3]

[0096] Next, refer to Figures 9 to 12 , a third embodiment of the present invention will be described.

[0097] Fig. 9 is an exploded perspective view of a connecting rod structure of a conveyor chain according to a third embodiment of the present invention, Fig.10 According to the third embodiment of the present invention Fig. 9 A cross-sectional view of the link structure of the conveyor chain is shown in Fig.11 yes Fig. 9 The plan view of the cylinder shown in Fig.12 Yes Description Fig. 9 A view of the range of guide slopes in the chain bosses of the drum shown in FIG.

[0098] Reference now Figures 9 to 12 The conveying chain for a sludge collector according to the third embodiment includes a plurality of unit chains 10 and chain pins 11 , each of which mediates a link group between the unit chains 10 .

[0099] The unit chain 10 is provided with a cylinder 101 on one side thereof and a yoke 102 on the other side thereof, wherein each of the cylinders 101 of the unit chain 10 is formed with a chain boss CB' on its outer surface, and each of the yokes 102 of the unit chain 10 is formed with a chain pocket CP' on its inner surface, the chain pocket CP' being recessed to correspond to the chain boss CB' of the unit chain 10 to which the chain pocket is to be connected.

[0100] In addition, the maximum width between the chain bosses CB' formed at opposite sides on the outer surface of the barrel 101 is greater than the inner width of the yoke 102 into which the barrel 101 is inserted (ie, the distance between opposite inner surfaces of the yoke).

[0101] In addition, a front region CB′-F of the chain boss CB′ in the insertion direction of the barrel 101 may be gradually lowered in the forward direction so as to facilitate insertion of the barrel 101 into the yoke 102 when assembling the barrel 101 and the yoke 102 .

[0102] Hereinafter, advantageous effects of the third embodiment having this structure will be described.

[0103] In the conveyor chain according to this embodiment, the maximum width between the chain bosses CB' formed at opposite sides on the outer surface of the barrel 101 is greater than the inner width of the yoke 102 into which the barrel 101 is inserted. Here, since the front area CB'-F of the chain boss CB' in the insertion direction of the barrel 101 gradually decreases toward its front end, when the barrel 101 and the yoke 102 are assembled, the barrel 101 can be easily inserted into the yoke 102.

[0104] That is, since the front side of the front zone CB'-F is lower, the barrel 101 can be easily inserted into the yoke 102 at the beginning of assembly, and since the maximum width between the chain bosses CB' formed at the opposite sides on the outer surface of the barrel 101 is larger than the inner width of the yoke 102 into which the barrel 101 is inserted, the chain bosses CB' of the barrel 101 will interfere with the yoke 102 during the insertion of the barrel 101.

[0105] Here, the yoke 102 with an elastically deformable structure expands to both sides by interfering with the chain boss CB' of the barrel 101, and when the chain boss CB' of the barrel 101 reaches the position where the chain boss CB' of the barrel 101 engages with the chain recess CP' of the yoke 102, the yoke 102 is elastically forced inward, whereby the chain boss CB' of the barrel 101 is fully inserted into the chain recess CP' of the yoke 102.

[0106] In the third embodiment having such a structure, there is no need to form a separate opening (CPO) or a guide (CPG) as provided in the first or second embodiment.

[0107] In the conveying chain according to this embodiment, when assembled, the chain boss CB' of the cylinder 101 is inserted into the chain pocket CP' of the yoke 102 through the elasticity of the yoke 102, and when a tensile load is applied to the conveying chain, the inner wall of each chain pocket CP' is clamped by the protrusion formed at the rear end of the chain boss CB'.

[0108] Furthermore, due to this seizure phenomenon, shear stress is also applied to the chain boss CB' of the drum 101, and thus the conveyor chain according to this embodiment can withstand an increased tensile load compared to a typical chain, thereby improving the durability and life of the conveyor chain.

[0109] [Example 4]

[0110] In the following, reference Fig.13 A fourth embodiment of the present invention is described.

[0111] In the first to third embodiments described above, it can be seen that the breaking strength of the chain is increased by the engagement of the chain boss CB or CB' with the inner wall of the chain pocket CP or CP'. In addition, the fourth embodiment of the present invention modifies the structure of the barrel of the unit chain 10 from the typical integral type to a detachable type, and the structure according to the fourth embodiment can be applied to the structure of the unit chain of the first to third embodiments described above.

[0112] More specifically, according to the fourth embodiment, the drum 101 as an element constituting the unit chain is characterized in that a connecting portion connecting the left and right sides of the drum is configured in the form of a separable roller.

[0113] With this structure, the fourth embodiment according to the present invention has the following effects.

[0114] According to this embodiment, in the unit chain 10, the connecting portion that integrally connects the left and right sides of the cylinder 101 has a detachable roller structure, so that when the chain is assembled, the separated roller-shaped connecting portion 1011 can be assembled to and supported on the support member 1012 protruding from the left and right inner surfaces of the cylinder.

[0115] Therefore, when the unit chain 10 according to this embodiment is applied to a sedimentation tank, since the roller-shaped connecting part 1011 is a detachable structure engaged with the chain and the sprocket, the roller-shaped connecting part 1011 can roll in an appropriate position in the event of interference with the sprocket, and the engaging position of the connecting part 1011 relative to the sprocket can be changed by this rolling action of the connecting part 1011.

[0116] This change in engagement position by rolling the connecting portion 1011 prevents side wear of the connecting portion 1011 when engaging the cylinder 101 and the sprocket, thereby alleviating the load on the chain.

[0117] Next, refer to Fig.14 and Fig.15 , another embodiment of a chain pin applicable to the present invention will be described.

[0118] Fig.14 is a perspective view of a chain pin made of steel reinforced plastic (SRP) as another embodiment of a chain pin according to the present invention, and Fig.15 yes Fig.14 Exploded perspective view of.

[0119] Referring to these drawings, in each of the first to fourth embodiments described above, the chain pin may be made of high-strength steel reinforced plastic (SRP).

[0120] That is, the chain pin 11' applying high-strength steel reinforced plastic (SRP) technology (hereinafter referred to as "SRP chain pin") refers to a chain pin in which the shaft portion of the chain pin is inserted into a stainless steel pipe and applied to the connecting portion to allow the unit chains 10 to be regularly connected to each other to form a line.

[0121] In a detailed configuration of the SRP chain pin 11 ′ according to the present invention, the SRP chain pin 11 ′ includes a plastic pin unit 170 formed of a plastic material and a steel sleeve 180 made of stainless steel and coupled to the plastic pin unit 170 .

[0122] The plastic pin unit 170 may be formed of, for example, an engineering plastic material and includes a shaft portion 171 , a jaw portion 172 coupled to one end of the shaft portion 171 , and a flange 173 formed at the other end of the shaft portion 171 and having a larger cross-sectional area than the shaft portion 171 .

[0123] The shaft portion 171 may be formed with a plurality of through holes (not shown). Since the plastic pin unit 170 is also formed of a plastic material that is significantly lighter than metal, the plurality of through holes formed in the shaft portion 171 further reduces the overall weight of the plastic pin unit 170 .

[0124] Although the plastic pin unit 170 may have lower strength and wear resistance than a pin unit whose entire shaft portion is made of steel, such disadvantages of the plastic pin unit 170 may be compensated by the steel sleeve 180 made of stainless steel.

[0125] The jaw portion 172 constitutes one end of the shaft portion 171. After the stainless steel sleeve 180 is press-fitted into the shaft portion 171, the jaw portion 172 may be coupled to the one end of the shaft portion 171. However, it should be understood that this coupling method does not limit the scope of the present invention.

[0126] This is because the SRP chain pin 11' can be molded in other ways. For example, the shaft portion 171 can be integrally formed with the steel sleeve 180 by insert-injection molding, wherein the steel sleeve 180 is inserted into a mold, thereby eliminating a separate assembly process of press-fitting the steel sleeve 180 into the shaft portion 171. Alternatively, the jaw portion 172 can also be injection molded onto one end of the shaft portion 171 at the same time as the shaft portion 171 is injection molded.

[0127] The jaw portion 172 may include a jaw recess 172a and a plurality of jaw wings 172b obliquely protruding from the circumferential surface of the jaw recess 172a. The plurality of jaw wings 172b may be caught by a peripheral rim formed at one side of a pin hole in the unit chain 10, thereby assembling the SRP chain pin 11' to the unit chain.

[0128] Additionally, a securing pin 172c may be disposed at a center point of the plurality of jaw wings 172b.

[0129] In addition, the flange 173 constitutes the other end of the shaft portion 171. Since the flange 173 has a larger cross-sectional area than the shaft portion 171, the flange 173 serves to prevent the plastic pin unit 170 from falling out of the pin hole formed in the unit chain 10.

[0130] On the other hand, the steel sleeve 180 is formed integrally with the shaft portion 171 of the plastic pin unit 170 by injection molding. In this embodiment, the steel sleeve 180 is applied to the insert-injection type steel sleeve integrated chain pin 11 by insert-injection molding in a mold, wherein the steel sleeve 180 is integrally molded to the outer wall of the shaft portion 171.

[0131] Here, a plurality of assembly holes 181 are formed in an externally preformed steel sleeve 180, and assembly protrusions 174 are formed on an outer wall of the shaft portion 171 to be coupled to the assembly holes 181. Therefore, the insertion-injection type SRP chain pin 11' prevents the pin unit 170 and the steel sleeve 180 from idling.

[0132] This insert-injection type SRP chain pin 11 ′ is used to prevent delamination due to repeated buckling loads applied to the non-metallic conveyor chain according to this embodiment. Of course, the external prefabricated steel sleeve 180 can also be integrally press-fitted into the shaft 171 of the plastic pin unit 170 .

[0133] By applying an SRP chain pin 11 ' having this configuration to improve durability compared to a typical chain pin, the durability and strength of the chain link structure can be greatly improved, thereby reducing maintenance costs and operating costs, while inhibiting microplastic elution by protecting the inner shaft portion from wear caused by sand and sludge due to the stainless steel pipe.

[0134] Furthermore, according to the present invention, when the link structure of the conveyor chain according to any one of Embodiments 1 to 4 is applied together with the SRP chain pin 11', the shear load borne only by the chain pin due to the tensile load on the chain in the sedimentation tank can be borne by the cylinder 101 and yoke 102 of the chain surrounding the SRP chain pin together with the highly reinforced SRP chain pin 11', whereby the non-metallic conveyor chain can have improved durability through the increase of its shear resistance, thereby ultimately improving the economic feasibility of the sludge removal facility through the reduction of its maintenance cost and the increase of its lifespan.

[0135]

Industrial Applicability

[0136] The present invention can improve the durability of a non-metal conveyor chain by increasing the shear strength of the non-metal conveyor chain by improving the chain link structure of the non-metal conveyor chain of a sedimentation tank of a sewage or wastewater treatment system applied to a sludge removal facility, thereby improving the operating efficiency by preventing the phenomenon of interfering with the operation of the sewage or wastewater treatment system due to the breakage of the conveyor chain, and is applicable not only to water treatment and contaminated water purification facilities but also to various facilities requiring conveyor chains. Therefore, the present invention has high industrial applicability.

Claims

1. A non-metallic conveyor chain with improved durability for a sludge collector, the non-metallic conveyor chain comprising: Multiple unit chains; and a chain pin by which the unit chains are connected to each other, wherein each of the unit chains is provided with a barrel on one side thereof and a yoke on the other side thereof, The cylinder of the unit chain is formed with a chain pocket having a groove structure on its outer surface, and The yoke of the unit chain is formed on an inner surface thereof with a chain boss which protrudes so as to correspond to the chain pocket of the unit chain to which the chain boss is to be coupled.

2. The non-metallic conveyor chain of claim 1, wherein the chain pockets comprise: a protective rim spaced apart from the pin hole of the barrel and formed in a predetermined area along the circumference of the pin hole; and An opening, the opening serving as a passage through which the chain boss is inserted into the chain pocket to be placed in the chain pocket.

3. The non-metallic conveyor chain according to claim 2, wherein an entrance width of the opening is greater than or equal to an outer diameter of the chain boss.

4. The non-metallic conveyor chain of claim 2, wherein the chain pockets further comprise: A guide member having a flat surface for guiding the chain boss inserted into the chain pocket through the opening to move from a side of an entrance of the opening to an inner surface of a side of the protection wheel rim, the guide member and the protection wheel rim together forming the chain pocket.

5. The non-metallic conveyor chain according to claim 3, wherein the inner surface of the chain pocket has a gradient in the depth direction of the chain pocket so that the chain pocket has a diameter that increases with the depth into the chain pocket.

6. A non-metallic conveyor chain with improved durability for a sludge collector, the non-metallic conveyor chain comprising a plurality of unit chains and chain pins, the unit chains being connected to each other by the chain pins, wherein each of the unit chains is provided with a barrel on one side thereof and a yoke on the other side thereof, The cylinder of the unit chain has a chain boss formed on its outer surface, and The yoke of the unit chain is formed on an inner surface thereof with a chain pocket recessed to correspond to the chain boss of the unit chain to which the chain pocket is to be coupled. 7 . The non-metal conveyor chain according to claim 6 , wherein a maximum width between chain bosses formed at opposite sides on the outer surface of the barrel is larger than an inner width of the yoke into which the barrel is inserted.

8. The non-metallic conveyor chain according to claim 7, wherein a front region of the chain boss in the insertion direction of the barrel is gradually lowered in a forward direction so as to facilitate insertion of the barrel into the yoke when assembling the barrel and the yoke.

9. The non-metal conveyor chain according to any one of claims 1 to 8, wherein a connecting portion connecting the left side and the right side of the drum has a separable roller structure.

10. The non-metallic conveyor chain of any one of claims 1 to 8, wherein the chain pins comprise steel reinforced plastic (SRP) chain pins made of SRP.

11. A sludge removal facility comprising: a sedimentation tank into which raw water is introduced; and a sludge collector configured to scrape sludge from the bottom of the sedimentation tank and discharge the sludge from the sedimentation tank, The sludge collector is provided with a non-metal conveyor chain according to any one of claims 1 to 8 to convey scum pushed by the operation of a scraper constituting the sludge collector from the water surface of the sedimentation tank to a tank for discharge.

Images