Non-metallic conveyor chain with improved durability and sludge removal equipment equipped with the same

Abstract

The present invention provides a non-metallic conveyor chain having improved durability by improving the chain link structure of the non-metallic conveyor chain and increasing the shear strength of the chain applied to sludge removal equipment.To this end, the present invention provides a conveyor chain for a sludge collector including a plurality of unit chains and chain pins for linking the unit chains to each other, the unit chains each having a barrel portion on one side and a yoke portion on the other side, a chain pocket having a recessed groove structure on the outer side of the barrel portion of the unit chain, and a protruding chain boss on the inner side of the yoke portion of the unit chain to correspond to the chain pocket of the linked unit chain.

Description

[Technical field]

[0001] The present invention relates to a non-metallic conveyor chain and a sludge removal equipment equipped with the same, and more particularly to a technology for improving the chain link structure of a non-metallic conveyor chain to improve the durability of the chain applied to the sludge removal equipment. [Background technology]

[0002] In sewage and wastewater treatment plants, various organic and inorganic substances are present in the raw water flowing into the treatment plant, and these, together with various suspended solids, are then subjected to a sewage treatment process.

[0003] In the normal sewage treatment process, sand and suspended solids contained in the inflowing sewage are removed in the inlet, then the sewage is separated by gravity in the primary settling tank, then passed through a biological reactor where microorganisms are used to decompose organic matter, and the supernatant water from the biological reactor is again allowed to settle in the secondary settling tank to remove suspended solids. The supernatant water then goes through a final total phosphorus facility where it is treated again to be purified, and finally goes through a sterilization process before being discharged.

[0004] During this treatment process, the primary sedimentation basin, which is the first settling basin, and the final sedimentation basin, which is the second settling basin, are equipped with sludge collectors to remove settled sludge, as well as scum skimmers to remove scum.

[0005] Referring to Figure 1, a settling basin 1 is generally equipped with a sludge collector 5 that scrapes up the sludge that has sunk to the bottom and sends it to a hopper H for discharging the sludge, and a scum skimmer device 2 that scoops up floating matter such as scum and vinyl that floats on the wastewater and discharges it through a trough T.

[0006] A supernatant water discharge channel 120 is provided behind the installation area of ​​the scum skimmer device 2 so that the supernatant water after passing through the scum skimmer 2 can be discharged to the outside of the settling basin 1 .

[0007] Here, the sludge collector 5 includes a collector driving motor 51, a head shaft 52 installed to rotate by receiving a driving force when the collector driving motor 51 is driven, an idle shaft 53 installed in sequence to rotate in conjunction with the rotation of the head shaft 52, a take-up shaft 54, a corner shaft 55, a main chain 56 wound around these shafts to transmit a rotational force to the idle shaft 53, the take-up shaft 54, and the corner shaft 55 when the head shaft 52 rotates, and a plurality of flights 57 arranged on the main chain 56 along its length.

[0008] The operating process of the sludge collector 5 will be described as follows: the driving force of the collector drive motor 51 is transmitted to the head shaft 52 via a head shaft drive chain wound around a sprocket connected to the head shaft 52, and when the head shaft 52 rotates, the main chain 56 wound around the head shaft 52, the idle shaft 53, the take-up shaft 54 ​​and the corner shaft 55 rotates along a predetermined orbit while rotating these shafts.

[0009] In this way, when the main chain 56 rotates, the flights 57 installed at regular intervals on the main chain 56 scrape up sludge at the bottom of the settling basin 1 and push the scum and floating matter toward the skimmer on the water surface. The sludge scraped up by the flights 57 at the bottom of the settling basin 1 falls into the hopper H and is discharged, and at the water surface, the scum and floating matter pushed by the flights 57 toward the side where the scum skimmer is installed is sent to the trough provided on the beach plate by the removal action caused by the rotation of the scum skimmer of the scum skimmer device 2 and discharged to the outside.

[0010] The supernatant water after passing through the scum skimmer device 2 is discharged outside the settling basin 1 via a weir 120 that constitutes a drainage channel.

[0011] In other words, in the sludge collector, a chain is wound in an endless track format in two rows installed along the length of the settling basin, and flights are attached at regular intervals across the width of the settling basin.When the endless track chain is driven by a sprout while receiving power, the flights attached to the chain at regular intervals transport the sludge that has settled by gravity to a hopper.

[0012] In a sludge collector of a so-called chain flight type, which is a type in which sludge is transported by flights attached to the chain, a conveyor chain is applied as a means for moving the flights.

[0013] Sedimentation basins are not standardized by treatment capacity, so their widths are variously selected from 16m to 2m, and their lengths are variously selected from 15m to 120m. As a result, the height of the flights is variously selected within the range of 150mm to 360mm, and their lengths are variously selected according to the width of the sedimentation basin.

[0014] Conveyor chains have traditionally been made mainly from cast iron or stainless steel, but when considering the overall length of the chain depending on the capacity of the sedimentation basin, if the entire chain is made of metal, excessive power is required to drive the chain under heavy loads (e.g. 19 tons) and various problems arise, such as inconvenience in maintenance and repair. To solve these problems, there has been a trend in recent years toward non-metallic conveyor chains made from composite materials or high-strength engineering plastics.

[0015] Meanwhile, in the chain flight type sludge collectors currently used in small settling basins, the two-row chain flight type is the most commonly used type, which has two rows of chains. This type of two-row chain flight type is configured so that flights are assembled to two rows of chains spaced apart from each other and move to collect sludge.

[0016] While this is not so much of a problem in small sedimentation basins, in large sedimentation basins that are 7m to 15m wide and 20m to 120m long, frequent chain breakage and damage due to sagging flights can occur when using the chain flight method, and various solutions have been proposed to address this issue.

[0017] For example, as one of the various methods for improving damage caused by flight sagging, the applicant's prior Korean Patent No. 10-2169694 (title of invention: Sludge collector using chain flight method with reinforced flights) presents a technology for reinforcing the flights.

[0018] That is, Korean Patent No. 10-2169694 proposes a technology that can effectively prevent warping, deformation, or damage of flights caused by the amount of sagging that occurs at the center of the flight due to the load of sludge when the flight moves while collecting sludge.

[0019] Meanwhile, among the main components of the sludge collector 5, namely the drive unit, sprockets, conveyor chain and flights, the conveyor chain is a product that requires high strength and durability due to the standards of the sedimentation basin, and taking into consideration the maintenance and assembly of the chain, it is basically assembled by connecting the chain links, with the yoke part and barrel part moving horizontally.

[0020] That is, as shown in Figures 2a and 2b, the existing transfer chain includes a yoke, a barrel, and a chain pin. The conveyor chain, which is formed by linking each unit chain together, is provided with attachments (see Figure 4) for setting flights at regular intervals.

[0021] When the chain links are connected, the barrel portion 101 of one of the two unit chains to be connected and the yoke portion 102 of the other of the two unit chains are disposed to face each other (see FIG. 2a).

[0022] Then, after positioning the barrel portion 101 inside the yoke portion 102 as in FIG. 2a, insert the steel sleeve integrated chain pin 11 so that it penetrates through the yoke portion and the barrel portion, connecting the two unit chains 10 (see FIG. 2b).

[0023] However, such a conveyor chain having the conventional chain link structure is subjected to a tensile force while being installed in a sedimentation basin. The tensile force applied to the chain acts as a shear load on the chain pin 11. However, the conventional structure was unable to distribute the shear load concentrated on the chain pin 11, so the chain pin 11 bears the entire load.

[0024] As a result, there was a problem in the past that the chain pin would break, as can be seen in the reference diagram of Figure 3a, or that stress would concentrate on the yoke portion 102 or barrel portion 101 adjacent to the chain pin, causing the corresponding portions to break, as can be seen in the reference diagrams of Figures 3b and 3c.

[0025] The breakage of the chain or chain pin caused by the chain link structure of the existing conveyor chain not only results in cost loss due to the maintenance and repair of the conveyor chain, but also leads to social and economic losses due to the inability to properly treat the raw water in the sedimentation basin. Therefore, technological development is required to solve this problem. Summary of the Invention [Problem to be solved by the invention]

[0026] The present invention has been made to solve the above-mentioned problems, and has an object to improve the durability of non-metallic conveyor chains by improving the chain link structure of non-metallic conveyor chains and increasing the shear strength of chains used in sludge removal equipment.

[0027] That is, the present invention aims to provide a non-metallic conveyor chain and sludge removal equipment having the same, which can improve the durability of the chain by increasing the shear resistance of the non-metallic conveyor chain by having the barrel part and yoke part of the chain covering the chain pin bear the shear load that was previously fully borne by the chain pin due to the tensile load applied to the chain in a settling basin. [Means for solving the problem]

[0028] In order to achieve the above object, the present invention provides a conveyor chain for a sludge collector, comprising a plurality of unit chains and chain pins for linking these unit chains to each other; the unit chains are provided with a barrel portion on one side and a yoke portion on the other side, the barrel portion of the unit chains is provided with a chain pocket having a recessed groove structure on the outside, and the yoke portion of the unit chains is provided with a protruding chain boss on the inside so as to correspond to the chain pocket of the linked unit chain. This non-metallic conveyor chain has improved durability.

[0029] In this case, the chain pocket includes a save rim that is spaced apart from the pinhole of the barrel portion and formed in a predetermined area around the pinhole, and an opening that serves as a passage for inserting and positioning the chain boss in the chain pocket.

[0030] It is preferable that the width of the entrance of the opening is at least equal to or greater than the outer diameter of the chain boss.

[0031] A guide is further provided having a surface that guides the movement of a chain boss inserted into the chain pocket through the opening, from one side of the entrance of the opening to the inner surface of one side of the save rim, and the guide forms the chain pocket together with the save rim.

[0032] The inner surface of the chain pocket may be formed in a gradient such that the diameter increases as the pocket goes deeper in the depth direction of the pocket.

[0033] Meanwhile, in order to achieve the above object, according to another aspect of the present invention, there is provided a conveyor chain for a sludge collector including a plurality of unit chains and chain pins for linking the unit chains to each other; the unit chains are provided with a barrel portion on one side and a yoke portion on the other side, a chain boss is provided on the outside of the barrel portion of the unit chain, and a chain pocket recessed to correspond to the chain boss of the linked unit chain is provided on the inside of the yoke portion of the unit chain, thereby providing an improved durability non-metallic conveyor chain.

[0034] At this time, the maximum width formed by both side chain bosses formed on the outer side of the barrel portion is larger than the inner width of the yoke portion into which the barrel portion is inserted.

[0035] The front region of the chain boss in the insertion direction of the barrel portion is formed in a shape that becomes lower toward the front so that the barrel portion can be easily inserted into the inside of the yoke portion when the barrel portion and the yoke portion are assembled.

[0036] On the other hand, the chain pin is characterized in that it is an SRP chain pin made of steel reinforced plastic (SRP).

[0037] Meanwhile, according to yet another aspect of the present invention for achieving the above-mentioned object, there is provided a sludge removal equipment comprising a sedimentation basin into which raw water flows, and a sludge collector configured to scrape up sludge at the bottom of the sedimentation basin and discharge it outside the sedimentation basin, the sludge collector comprising a non-metallic conveyor chain configured as claimed in any one of claims 1 to 8, for sending scum pushed out by the action of flights constituting the sludge collector on the water surface of the sedimentation basin to a trough for discharge. Effect of the Invention

[0038] The effect of the present invention is that the shear load that was previously borne entirely by the chain pin due to the tensile load applied to the chain in the settling basin is now borne by both the barrel and yoke parts of the chain that cover the chain pin, thereby increasing the shear resistance of the non-metallic conveyor chain and improving the durability of the chain.

[0039] That is, according to the present invention, the outer chain pocket of the barrel portion and the inner chain boss of the yoke portion engage with each other to reduce shear stress together with the chain pin, thereby improving the durability of the non-metallic conveyor chain and thereby increasing the service life of the chain.

[0040] In addition, according to the present invention, high-strength steel reinforced plastic (SRP) technology is applied to the chain pin, which is an element that constitutes the chain link structure, and a chain pin that is inserted into a stainless steel pipe is used, which significantly increases the durability and tensile strength of the chain compared to the existing chain link structure, reduces maintenance costs and operation and maintenance costs, protects against wear caused by sand and sludge, and reduces the elution of fine plastic.

[0041] As described above, the present invention improves the chain link structure of a non-metallic conveyor chain and increases the durability and service life of the non-metallic conveyor chain, thereby not only reducing the cost loss caused by replacement and maintenance repair due to chain breakage caused by existing conveyor chains, but also preventing social and economic losses caused by the inability to properly treat raw water in a settling basin, thereby contributing to improving the economic efficiency of the operation of sludge removal equipment. [Brief description of the drawings]

[0042] [Figure 1] FIG. 1 is a partially cutaway perspective view showing an example of a sludge removal facility.

[0043]

[0044] [Figure 2a] 1 is a partially cutaway plan view showing a link assembly process of a conventional conveyor chain;

[0045] [Figure 2b] 1 is a partially cutaway plan view showing a link assembly process of an existing conveyor chain, and FIG.

[0046] [Figure 3a] FIG. 1 is a reference diagram showing problems caused by the chain link structure of an existing non-metallic conveyor chain. [Figure 3b] FIG. 1 is a reference diagram showing problems caused by the chain link structure of an existing non-metallic conveyor chain. [Figure 3c] FIG. 1 is a reference diagram showing problems caused by the chain link structure of an existing non-metallic conveyor chain.

[0047] [Figure 4] 1 is a perspective view showing a link structure of a conveyor chain according to a first embodiment of the present invention;

[0048] [Diagram 5] FIG. 5 is an exploded perspective view of a main part shown in relation to part "A" in FIG. 4.

[0049] [Figure 6] FIG. 5 is a cross-sectional view of a main portion shown in relation to part "A" in FIG. 4, illustrating a state in which a chain boss formed in a yoke portion has been inserted into a chain pocket formed in a barrel portion of the conveyor chain.

[0050] [Figure 7] FIG. 11 is an exploded perspective view of a main portion showing a link structure of a conveyor chain according to a second embodiment of the present invention.

[0051] [Figure 8] 8 is a cross-sectional view showing a link structure of a conveyor chain according to a second embodiment of the present invention in relation to FIG. 7.

[0052] [Figure 9] FIG. 11 is an exploded perspective view of a main portion showing a link structure of a conveyor chain according to a third embodiment of the present invention.

[0053] [Figure 10] FIG. 10 is a cross-sectional view showing a link structure of a conveyor chain according to a third embodiment of the present invention in relation to FIG. 9.

[0054] [Figure 11] FIG. 10 is a plan view of the barrel portion of FIG.

[0055] [Figure 12] 10 is a diagram for explaining a range in which a guide inclined surface is formed in the chain boss of the barrel portion in FIG. 9. FIG.

[0056] [Figure 13] FIG. 11 is an exploded perspective view of a main portion showing a link structure of a conveyor chain according to a fourth embodiment of the present invention.

[0057] [Figure 14]FIG. 11 is a perspective view of a chain pin to which steel reinforced plastic (SRP) is applied, as another embodiment of the chain pin applied to the present invention.

[0058] [Figure 15] FIG. 15 is an exploded perspective view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0059] The objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments thereof, taken in conjunction with the accompanying drawings.

[0060] However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and the embodiments are provided in order to fully disclose the present invention and to fully convey the scope of the invention to those skilled in the art.

[0061] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and therefore, at the time of filing this application, there may be various equivalents and modifications that can replace them. EXAMPLES

[0062]

[0063] [Example 1]

[0064] First, a first embodiment of the present invention will be described with reference to FIGS.

[0065] FIG. 4 is a perspective view showing a link structure of a conveyor chain according to a first embodiment of the present invention, FIG. 5 is an exploded perspective view of a main portion shown in association with part "A" of FIG. 4, and FIG. 6 is a cross-sectional view of a main portion shown in association with part "A" of FIG. 4, showing the state after insertion of a chain boss formed in a yoke portion into a chain pocket formed in a barrel portion of the conveyor chain has been completed.

[0066] Hereinafter, a link structure of a conveyor chain according to a first embodiment of the present invention will be described with reference to FIGS.

[0067] According to the first embodiment of the present invention, the conveyor chain for a sludge collector includes a plurality of unit chains 10 and chain pins 11 that are inserted into pinholes 101a and 102a to link the unit chains 10 to each other.

[0068] At this time, a barrel portion 101 is provided on one side of the unit chain 10, and a yoke portion 102 is provided on the other side. A chain pocket CP having a recessed groove shape is provided on the outer side of the barrel portion 101 of the unit chain 10, and a chain boss CB, which is a protruding portion, is provided on the inner side of the yoke portion 102 of the unit chain 10 so as to correspond to the chain pocket CP of another unit chain 10 to be linked thereto.

[0069] Meanwhile, the chain pocket CP includes a save rim SR that is spaced from the pin hole 101a of the barrel portion 101 and formed in a predetermined area along the periphery of the pin hole 101a, an opening CPO that serves as a passage for inserting the chain boss CB into the chain pocket CP and positioning it therein, and a guide CPG having a surface that guides the movement of the chain boss CB inserted into the chain pocket CP through the opening CPO from one side of the entrance of the opening CPO to the inner surface of one side of the save rim SR.

[0070] That is, the guide CPG has a vertical surface, and thus constitutes a chain pocket CP together with the save rim SR and the opening CPO.

[0071] The width of the opening CPO at its entrance is at least as large as the outer diameter of the chain boss CB.

[0072] The operation and effect of the non-metallic conveyor chain according to the first embodiment of the present invention configured as above will be described below.

[0073] According to the link structure of the conveyor chain of this embodiment, the shear load acting on the chain in the sedimentation basin is received by both the chain pin 11 and the barrel portion 101 and yoke portion 102 covering the chain pin 11, thereby increasing the shear resistance of the non-metallic conveyor chain and thereby improving the durability of the chain.

[0074] In other words, in the existing conveyor chain link structure, when a tensile load is applied to the chain in the settling basin, only the chain pin 11 can fully withstand the shear load, which can cause the yoke portion 102, barrel portion 101, or chain pin 11 to break, resulting in a problem of insufficient durability.

[0075] However, according to this embodiment, the shear load applied to the chain installed in the sedimentation basin is received by both the barrel portion 101 and the yoke portion 102 of the chain covering the chain pin 11, thereby increasing the shear resistance of the non-metallic conveyor chain and thereby improving the durability of the conveyor chain.

[0076] That is, according to the present invention, the chain pocket CP on the outside of the barrel portion 101 and the chain boss CB on the inside of the yoke portion 102 engage with each other, thereby reducing shear stress together with the chain pin 11. As a result, the durability of the non-metallic conveyor chain is improved, thereby providing the effect of increasing the service life of the chain and related equipment.

[0077]

[0078] [Example 2]

[0079] A second embodiment of the present invention will now be described with reference to FIGS.

[0080] FIG. 7 is an exploded perspective view of a main portion showing a link structure of a conveyor chain according to a second embodiment of the present invention, and FIG. 8 is a cross-sectional view showing the link structure of a conveyor chain according to the second embodiment of the present invention in relation to FIG. 7.

[0081] 7 and 8, the basic structure of the conveyor chain according to the second embodiment of the present invention is the same as that of the first embodiment, except that a gradient is formed on the meshing surfaces of the chain pocket CP and the chain boss CB.

[0082] That is, the conveyor chain for a sludge collector according to this embodiment also includes a plurality of unit chains 10 and chain pins 11 that are inserted into pinholes 101a, 102a to link these unit chains 10 together.

[0083] In this case, a barrel portion 101 is provided on one side of the unit chain 10, and a yoke portion 102 is provided on the other side. A chain pocket CP having a recessed groove structure is provided on the outer side of the barrel portion 101 of the unit chain 10, and a protruding chain boss CB is provided on the inner side of the yoke portion 102 of the unit chain 10 so as to correspond to the chain pocket CP of the unit chain 10 to be linked thereto.

[0084] The chain pocket CP includes a save rim SR that is spaced from the pin hole 101a of the barrel portion 101 and formed in a predetermined area around the pin hole 101a, an opening CPO that serves as a passageway for inserting the chain boss CB into the chain pocket CP and positioning it therein, and a guide CPG having a surface that guides the movement of the chain boss CB inserted into the chain pocket CP through the opening CPO from one side of the entrance of the opening CPO to the inner surface of one side of the save rim SR.

[0085] In this embodiment, the guide CPG, together with the save rim SR and the opening CPO, constitutes the chain pocket CP, and the guide surface of the guide CPG and the inner surface of the save rim SR are configured to have a gradient, so that the diameter of the inner surface of the chain pocket CP increases overall in the depth direction of the pocket as it goes from the outside of the pocket to the inside of the pocket.

[0086] That is, the inner surface of the save rim SR constituting the chain pocket CP and the guide surface of the guide CPG have a gradient such that the diameter of the pocket increases as it goes deeper inside in the depth direction of the chain pocket CP.

[0087] According to the second embodiment of the present invention configured as described above, in order to facilitate the assembly of the chain boss CB of the yoke portion 102, which is inserted through the opening CPO, which is an area of ​​the chain pocket CP where the save rim SR is not formed, a guide CPG having a sloped guide surface is provided on one side of the chain pocket CP.

[0088] Meanwhile, the inner surface of the save rim SR and the inner surface of the guide CPG are inclined so that the chain pocket CP becomes wider as it approaches the bottom of the chain pocket CP, and the outer surface of the chain boss CB is also inclined in a corresponding mold-fitting structure.

[0089] In the configuration of this embodiment, the mutually corresponding joining surfaces of the chain boss CB and the chain pocket CP have a gradient, so that the phenomenon of the yoke portion widening can be more effectively prevented.

[0090] In other words, the locking portion CPH is configured by the gradient formed in the chain boss CB and the chain pocket CP, which more effectively prevents the phenomenon in which the chain pin 11 warps and the yoke portion spreads when the chain is subjected to a tensile load.

[0091] More specifically, when the chain pin 11 tries to bend due to the tensile load acting on the conveyor chain, the yoke portion 102 conventionally easily spreads along the axial direction of the chain pin 11. However, according to this embodiment, the chain boss CB and the chain pocket CP have respective gradients formed therein to form the locking portion CPH, which interferes with the axial movement of the chain pin 11 and prevents the yoke portion 102 from spreading.

[0092] Therefore, even if the conveyor chain is subjected to a tensile load and a force acts to warp the chain pin 11, the phenomenon in which the yoke portion 102 spreads is effectively prevented, thereby making it possible to more effectively prevent the chain from breaking.

[0093]

[0094] [Example 3]

[0095] Hereinafter, a third embodiment of the present invention will be described with reference to FIGS.

[0096] FIG. 9 is an exploded perspective view of essential parts showing the link structure of a conveyor chain according to the third embodiment of the present invention, FIG. 10 is a cross-sectional view showing the link structure of a conveyor chain according to the third embodiment of the present invention in relation to FIG. 9, FIG. 11 is a plan view of the barrel portion of FIG. 9, and FIG. 12 is a diagram for explaining the range of formation of the guide inclined surface in the chain boss of the barrel portion of FIG. 9.

[0097] 9 to 12, the conveyor chain for a sludge collector according to the third embodiment of the present invention comprises a plurality of unit chains 10 and chain pins 11 that mediate between the unit chains 10 to link them to each other.

[0098] At this time, a barrel portion 101 is provided on one side of the unit chain 10, and a yoke portion 102 is provided on the other side of the unit chain 10. A chain boss CB' is provided on the outside of the barrel portion 101 of the unit chain 10, and a chain pocket CP' is provided on the inside of the yoke portion 102 of the unit chain 10, which is recessed to correspond to the chain boss CB' of the linked unit chain 10.

[0099] The maximum width of the chain bosses CB' on both sides, which is defined as the distance between the outer surfaces of the chain bosses CB' on both sides formed on the outside of the barrel portion 101, is greater than the inner width of the yoke portion 102 into which the barrel portion 101 is inserted (i.e., the distance between the inner surfaces of the yoke portion on both sides).

[0100] The front portion CB'-F region of the chain boss CB' in the insertion direction of the barrel portion 101 becomes lower toward the front so that the barrel portion 101 can be easily inserted into the inside of the yoke portion 102 when the barrel portion 101 and the yoke portion 102 are assembled.

[0101] The following describes the effects of the third embodiment of the present invention having such structural features.

[0102] In the conveyor chain according to this embodiment, the maximum width of the chain bosses CB' on both sides formed on the outside of the barrel portion 101 is greater than the inner width of the yoke portion 102 into which the barrel portion 101 is inserted. Instead, the front portion CB'-F of the chain boss CB' in the insertion direction of the barrel portion 101 becomes lower as it approaches the front end. Therefore, when the barrel portion 101 and the yoke portion 102 are assembled, the barrel portion 101 can be easily inserted into the inside of the yoke portion 102.

[0103] In other words, since the front side of the front portion CB'-F area is low, at the initial stage of assembly, the barrel portion 101 can easily enter between the inner widths of the yoke portion 102, and thereafter, the maximum width of the chain bosses CB' on both sides formed on the outside of the barrel portion 101 is formed larger than the inner width of the yoke portion 102 into which the barrel portion 101 is inserted, so that the entry of the barrel portion 101 causes the chain boss CB' of the barrel portion 101 to interfere with the yoke portion 102.

[0104] At this time, the yoke portion 102, which has a structure that can be elastically deformed due to interference with the chain boss CB' of the barrel portion 101, spreads out on both sides, and as the barrel portion 101 continues to advance and the chain boss CB' of the barrel portion 101 reaches a position where it is aligned with the chain pocket CP' of the yoke portion 102, the yoke portion 102 contracts inward due to its elastic restoring force, so that the chain boss CB' of the barrel portion 101 is accurately inserted into the chain pocket CP' of the yoke portion 102.

[0105] In the case of the third embodiment configured as above, it is not necessary to form the opening CPO or the guide CPG that are separately provided in the first or second embodiment.

[0106] When the conveyor chain of this embodiment is assembled, the elasticity of the yoke portion 102 causes the chain boss CB' of the barrel portion 101 to be inserted into the chain pocket CP' of the yoke portion 102, and when a tensile load is applied to the conveyor chain, the inner wall of the chain pocket CP' engages with the protruding portion at the rear of the chain boss CB'.

[0107] Due to this locking phenomenon, shear stress is also applied to the chain boss CB' of the barrel portion 101, which increases the tensile load that the conveyor chain in this embodiment can withstand compared to conventional chains, thereby improving the durability and extending the service life of the conveyor chain.

[0108]

[0109] [Example 4]

[0110] Hereinafter, the fourth embodiment of the present invention will be described with reference to FIG.

[0111] In the first to third embodiments described above, it can be seen that the strength with which the chain can withstand breakage is increased by the chain bosses CB, CB' which engage with the inner walls of the chain pockets CP, CP'. In addition, the fourth embodiment of the present invention improves the structure of the barrel portion of the unit chain 10 from the existing integrated type to a separated type structure, and the structure of this embodiment is applicable to all of the unit chain structures of the present invention related to the first to third embodiments described above.

[0112] More specifically, the fourth embodiment of the present invention is characterized in that in the barrel portion 101, which is an element constituting a unit chain, the connecting part connecting the left and right sides of the barrel portion is configured in the form of a roller having a separately separated structure.

[0113] The effects of the fourth embodiment of the present invention thus configured will be described below.

[0114] According to this embodiment, in the unit chain 10, the connecting parts that connected the left and right sides of the barrel portion 101 as a single unit are separated to form a roller, and this separated roller-shaped connecting portion 1011 is assembled to and supported by support portions 1012 that are protrudingly formed on the left and right inner sides of the barrel portion when the chain is assembled.

[0115] Therefore, when the unit chain 10 of this embodiment is applied to a sedimentation basin, the roller-shaped connecting part 1011 has a separated structure in the meshing between the chain and the sprocket, so that when interference with the sprocket occurs, the roller-shaped connecting part 1011 can roll in its original position, and the rolling action of this connecting part 1011 can change the meshing position of the connecting part 1011 with the sprocket.

[0116] In this way, changing the meshing position by rolling the connecting portion 1011 can prevent uneven wear of the connecting portion 1011 caused by the meshing between the barrel portion 101 and the sprocket, and this configuration can provide the effect of reducing the load on the chain.

[0117] Hereinafter, another embodiment of the chain pin applied to the present invention will be described with reference to FIGS.

[0118] FIG. 14 is a perspective view of a chain pin to which steel reinforced plastic (SRP) is applied in another embodiment of the chain pin applied to the present invention, and FIG. 15 is an exploded perspective view of FIG.

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

[0120] That is, the chain pin 11' (hereinafter referred to as "SRP chain pin") which applies high-strength steel reinforced plastic (SRP) technology refers to a chain pin in which the shaft of the pin is inserted inside a stainless steel pipe, and is applied to a connecting part where each unit chain 10 is connected so that each unit chain 10 is regularly connected to form a line.

[0121] To explain the specific configuration of the SRP chain pin 11' of the present invention, the SRP chain pin 11' includes a plastic pin unit 170 made of a plastic material, and a steel sleeve 180 made of a stainless steel material that is coupled to the plastic pin unit 170.

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

[0123] A number of through holes (not shown) may be formed in the axial direction of the shaft 171. In this case, since the plastic pin unit 170 itself is made of plastic, it is much lighter than metal, and in addition, since a number of through holes are formed in the shaft 171, the overall weight can be further reduced.

[0124] However, the plastic pin unit 170 may be weaker in strength and wear resistance than when the entire shaft is made of steel material, but the steel sleeve 180 can compensate for this drawback.

[0125] Meanwhile, the jaw portion 172 forms one end of the shaft portion 171. After a stainless steel sleeve 180 is assembled to the shaft portion 171 by a press-fitting method, the jaw portion 172 may be coupled to one end of the shaft portion 171, but such an assembly method does not limit the scope of the present invention.

[0126] This is because the SRP chain pin 11' may be molded in other ways. For example, when the shaft portion 171 is injection molded, a steel sleeve 180 may be inserted into a mold and then insert-molded together with the shaft portion 171, thereby eliminating the need for a separate assembly process of pressing the steel sleeve 180 into the shaft portion 171. In yet another molding method, the jaw portion 172 may be injection molded onto one end of the shaft portion 171 at the same time that the shaft portion 171 is injection molded.

[0127] Meanwhile, the jaw portion 172 may include a jaw pocket 172a and a number of jaw wings 172b that protrude in an inclined manner from the periphery of the jaw pocket 172a. The number of jaw wings 172b may be engaged with a boundary step on one side of a pinhole formed in the unit chain 10, so that the SRP chain pin 11' may be assembled into the unit chain.

[0128] A fix pin 172c is provided at the center of the multiple jaw wings 172b.

[0129] The flange portion 173 forms the other end of the shaft portion 171. The flange portion 173 has a cross-sectional area larger than that of the shaft portion 171, so that the plastic pin unit 170 does not slip out of the pinhole formed in the unit chain 10.

[0130] Meanwhile, the steel sleeve 180 is molded when it is integrally injected onto the shaft portion 171 of the plastic pin unit 170. In this embodiment, the steel sleeve 180 is integrally insert-injected onto the outer wall of the shaft portion 171 inside a mold, and is applied to the steel sleeve integrated chain pin 11 of the integral molding insert injection method.

[0131] At this time, a number of assembly holes 181 are formed in the externally assembled steel sleeve 180, and assembly protrusions 174 are formed on the outer wall of the shaft 171 to be assembled into the assembly holes 181. Therefore, the pin unit 170 and the steel sleeve 180 do not spin freely in the insert injection type SRP chain pin 11'.

[0132] The SRP chain pin 11' of the insert injection method serves to prevent peeling caused by repeated buckling load acting on the non-metallic conveyor chain according to the present embodiment. Of course, deviating from this method, the externally assembled steel sleeve 180 can be press-fitted integrally onto the shaft 171 of the plastic pin unit 170 by a press-fit method.

[0133] By applying the SRP chain pin 11' configured in this manner, the wear resistance is improved compared to the existing chain pin, thereby significantly increasing the durability and strength of the chain link structure, and the increased durability can reduce the maintenance costs and operation and maintenance costs. The stainless steel pipe protects the inner shaft from wear caused by sand and sludge, and reduces the elution of fine plastics.

[0134] Meanwhile, according to the present invention, when the SRP chain pin 11' and the conveyor chain link structures according to the above-mentioned embodiments 1 to 4 are applied, the shear load that the chain pin has been fully resistant to due to the tensile load applied to the chain in the sedimentation basin can be borne by the barrel portion 101 and the yoke portion 102 of the chain covering the SRP chain pin together with the SRP chain pin 11' reinforced with high strength, and as a result, the durability of the chain can be improved through the increase in the shear resistance of the non-metallic conveyor chain. This ultimately reduces the cost of maintaining and managing the sludge removal equipment and increases the service life, thereby improving the economy of the sludge removal equipment. [Industrial Applicability]

[0135] The present invention improves the chain link structure of a non-metallic conveyor chain applied to the settling basin of a sewage or wastewater treatment system, and enhances the shear strength of the chain applied to sludge removal equipment, thereby improving durability. As a result, it is possible to prevent a phenomenon that causes a short circuit in the conveyor chain, which hinders the operation of a sewage or wastewater treatment system, and improve operational efficiency. Since the present invention is applicable not only to water treatment and polluted water purification facilities, but also to various other facilities that require chain equipment, it is an invention with extremely high industrial applicability.

Claims

1. A conveyor chain for a sludge collector, comprising a plurality of unit chains and chain pins for linking the unit chains to each other, The unit chain has a barrel portion on one side and a yoke portion on the other side, A chain pocket having a concave groove structure is provided on the outside of the barrel portion of the unit chain, A protruding chain boss is provided on the inside of the yoke portion of the unit chain so as to correspond to the chain pocket of the linked unit chain, The chain pocket is a save rim formed in a predetermined area along the periphery of the pinhole and spaced from the pinhole of the barrel portion; an opening serving as a passageway for inserting the chain boss into and positioning it in the chain pocket; Furthermore, a guide having a surface for guiding movement of a chain boss inserted into the chain pocket through the opening is provided from one side of the entrance of the opening to the inner surface of one side of the save rim, The guide forms a chain pocket together with the save rim, A non-metallic conveyor chain with improved durability, characterized in that the chain pin is inserted through the yoke portions and the corresponding barrel portions of the two unit chains to be connected to each other, with the chain bosses of the unit chains linked to the chain pockets of the unit chains being coupled together, thereby connecting these two unit chains.

2. 2. The non-metallic conveyor chain with improved durability according to claim 1, wherein the width of the opening at the entrance is at least equal to or greater than the outer diameter of the chain boss.

3. 2. The non-metallic conveyor chain according to claim 1, wherein the inner surface of the chain pocket has a gradient shape such that the diameter increases as the pocket goes deeper in the depth direction.

4. A conveyor chain for a sludge collector, comprising a plurality of unit chains and chain pins for linking the unit chains to each other, The unit chain has a barrel portion on one side and a yoke portion on the other side, A chain boss is provided on the outside of the barrel portion of the unit chain, a chain pocket recessed to correspond to a chain boss of a linked unit chain is provided on the inside of the yoke portion of the unit chain; The maximum width formed by the chain bosses on both sides formed on the outer side of the barrel portion is greater than the inner width of the yoke portion into which the barrel portion is inserted, A non-metallic conveyor chain having improved durability, wherein a front region of the chain boss in an insertion direction of the barrel portion is formed to become lower toward the front so that the barrel portion can be easily inserted into the inside of the yoke portion when the barrel portion and the yoke portion are assembled.

5. 5. The non-metallic conveyor chain having improved durability according to claim 1, wherein the connecting parts connecting the left and right sides of the barrel portion are configured in the form of rollers having a separately separated structure.

6. 5. The non-metallic conveyor chain with improved durability according to claim 1, wherein the chain pins are steel reinforced plastic (SRP) chain pins made of SRP.

7. a settling basin into which raw water flows; a sludge collector configured to scrape up sludge at the bottom of the settling basin and discharge it outside the settling basin; The sludge collector comprises: A sludge removal facility comprising a non-metallic conveyor chain having a configuration according to any one of claims 1 to 4, for sending and discharging scum pushed out by the action of the flights constituting the sludge collector at the water surface of the sedimentation basin into a trough.

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