Chain for shallow slot sorting machine

Abstract

The utility model discloses a chain for a shallow slot sorting machine, which is characterized in that a circular hole and a sleeve insertion hole are respectively arranged at two ends of each inner chain plate, and a pair of mutually opposite inner chain plates are separately arranged in a way that the circular hole of one inner chain plate corresponds to the sleeve insertion hole of the other inner chain plate; the two sleeves are arranged between the pair of inner chain plates in the mode that the two ends are opposite, and the insertion part of one sleeve is inserted into the sleeve insertion hole of one of the pair of inner chain plates. The end face of the second end of the sleeve makes contact with the inner surface of the other inner chain plate in the pair of inner chain plates, and an inner hole of the sleeve is aligned with a circular hole of the other inner chain plate. The pair of outer chain plates are separately arranged on the outer sides of the pair of inner chain plates in the width direction; and the fixing pins penetrate through the outer chain plates, the inner chain plates and the sleeves to fixedly connect the inner chain links with the outer chain links. By the adoption of the chain, the machining process can be reduced, and the production cost of the chain can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mine processing equipment technical field more specifically, it relates to a shallow groove sorting machine chain. BACKGROUND

[0002] At present, the mechanical equipment for washing coal in mine, all adopts shallow groove sorting machine chain. CN205896041U patent document discloses a shallow groove sorting machine chain and the connecting shaft on the chain, and the chain is composed of chain connecting plate, sleeve and wear-resistant layer. Two straight edge oval link holes are symmetrically arranged on the chain connecting plate, the interval of the two straight edges of the link hole is equal to the inner diameter of the sleeve, and the interval of the two symmetric arcs is equal to the outer diameter of the sleeve. Two arc-shaped positioning sheets are symmetrically arranged at the two ends of the sleeve, the arc-shaped positioning sheet and the sleeve body form a connecting groove, the arc-shaped positioning sheet and the oval arc surface of the straight edge oval link hole are matched and docked, and the connecting groove is connected with the straight edge of the straight edge oval link hole.

[0003] CN218023659U patent document discloses a wear-resistant shallow groove chain, which comprises a shaft pin, a threaded pin, an outer sheet, an inner sheet, a sleeve arranged between the two groups of inner sheets, and S-shaped wear-resistant welding rods welded on the upper and lower surfaces of the outer sheet and the inner sheet. The two ends of the sleeve are provided with butt joints, and the structure of the sleeve is the same as that of the sleeve disclosed in CN205896041U patent document.

[0004] The chain with the above-mentioned sleeve structure needs to use a milling machine processing technology to process the two ends of the sleeve and the straight edge oval hole of the chain connecting plate. This additional milling machine processing technology brings certain complexity to the production of the chain, and thus increases the processing cost. SUMMARY

[0005] The utility model provides a shallow groove sorting machine chain, which can appropriately reduce the milling machine processing technology and thus reduce the cost of the chain.

[0006] To achieve the above-mentioned purpose, the utility model takes the technical scheme that:

[0007] A shallow groove sorting machine chain, comprising a plurality of inner chain links and a plurality of outer chain links, which are connected in series in an alternating manner along the length direction, the inner chain link comprises a pair of inner chain plates opposite to each other, and the outer chain link comprises a pair of outer chain plates opposite to each other. The chain further comprises a circular hole and a sleeve insertion hole respectively formed at both ends of each inner chain plate, and the pair of inner chain plates are arranged in a width direction in a manner that the circular hole of one inner chain plate corresponds to the sleeve insertion hole of the other inner chain plate.

[0008] The chain further comprises a plurality of sleeves, each of which has a first end and a second end opposite to the first end and different in shape. The first end of the sleeve is formed with an insertion portion, and two sleeves are arranged between the pair of inner link plates in a manner that the insertion portion of one sleeve is inserted into the sleeve insertion hole of one of the pair of inner link plates, and the second end of the sleeve is in contact with the inner surface of the other inner link plate of the pair of inner link plates, and the inner hole of the sleeve is aligned with the circular hole of the other inner link plate.

[0009] Each outer link plate is provided with two pin insertion holes at both ends, and the pair of outer link plates are arranged outside the pair of inner link plates of the inner link in a width direction. The chain further comprises a plurality of fixing pins, each of which passes through the pin insertion hole of the outer link plate, the circular hole or the sleeve insertion hole of the inner link plate, and the inner hole of the sleeve to fixedly connect the inner link and the outer link.

[0010] In an optional embodiment, the sleeve insertion hole comprises a straight-edged oval hole, and the insertion portion comprises two opposite stepped grooves on the outer surface of the first end of the sleeve, wherein when the insertion portion is inserted into the straight-edged oval hole, the groove wall of the stepped groove is connected with the straight edge of the straight-edged oval hole.

[0011] In an optional embodiment, the axis of the fixing pin is coaxial with the axis of the inner hole of the sleeve and the axis of the circular hole of the inner link plate.

[0012] In an optional embodiment, the pair of outer link plates comprises a first outer link plate and a second outer link plate, and each outer link plate provided with two pin insertion holes at both ends comprises the first outer link plate provided with two first pin insertion holes and the second outer link plate provided with two second pin insertion holes, wherein the diameter of the first pin insertion hole is slightly smaller than the diameter of the second pin insertion hole.

[0013] In an optional embodiment, the plurality of outer links comprises a first outer link and a second outer link which are mutually reversed,

[0014] The first outer link plate in the first outer link and the second outer link plate in the second outer link are in the same horizontal plane, and the second outer link plate in the first outer link and the first outer link plate in the second outer link are in the same horizontal plane; wherein the plurality of outer links are arranged in a manner that every two or three first outer links are provided with one second outer link.

[0015] In an optional embodiment, the fixing pin comprises a connecting pin and a threaded long shaft pin, wherein the first outer link is fixedly connected with the inner link through the fixing pin, and the second outer link is fixedly connected with the inner link through the threaded long shaft pin.

[0016] In an optional embodiment, the connecting pin includes a top portion and a pin body, the diameter of the top portion being slightly larger than the diameter of the pin body. The connecting pin passes from bottom to top through a second pin insertion hole of the second outer link plate of the first outer link, a circular hole or sleeve insertion hole of one of the pair of inner link plates, the inner hole of the sleeve, a sleeve insertion hole or circular hole of the other of the pair of inner link plates, and a first pin insertion hole of the first outer link plate of the first outer link; wherein the top portion is at least partially inserted into the second pin insertion hole of the second outer link plate.

[0017] In an optional embodiment, the threaded long shaft pin includes a threaded portion, a pin shank, and an intermediate portion located between the threaded portion and the pin shank. The intermediate portion has a cylindrical body with a boss on the body, and the diameter of the cylindrical body is slightly larger than the diameter of the pin shank.

[0018] The threaded long shaft pin passes from top to bottom through the second pin insertion hole of the second outer link plate of the second outer link, the circular hole or sleeve insertion hole of one of the pair of inner link plates, the inner hole of the sleeve, the sleeve insertion hole or circular hole of the other of the pair of inner link plates, and the first pin insertion hole of the first outer link plate of the second outer link.

[0019] Wherein, at least a portion of the column body in the middle section is inserted into the second pin insertion hole of the second outer link plate of the second outer link.

[0020] In an optional embodiment, the side surface of the inner chain plate is formed with a wear-resistant portion in a metallurgical manner, and the wear-resistant portion is disposed on the side surface next to the circular hole and the sleeve insertion hole of the inner chain plate.

[0021] In an optional embodiment, the wear-resistant part includes at least one wear-resistant point or vertical wear-resistant rib protruding from the side surface, and the material of the wear-resistant part is a hard alloy that is harder than the material of the inner chain plate.

[0022] In an optional embodiment, the side surface of the outer chain plate is also formed with a wear-resistant portion in a metallurgical manner. The wear-resistant portion is disposed on the side surface next to the pin insertion hole of the outer chain plate and includes at least one wear-resistant point or vertical wear-resistant rib protruding from the side surface.

[0023] The chain employing this invention has a sleeve with a specific-shaped insertion part only at the first end, eliminating the need for an insertion part at the second end. This saves material on the sleeve and reduces the processing steps required for the second end, thus increasing production speed and significantly reducing chain production costs. Furthermore, the process of forming a circular hole on the inner chain plate is less complex than that of forming the sleeve insertion hole. Attached Figure Description

[0024] Figure 1This is a chain for a shallow trench sorting machine according to an embodiment of the present utility model.

[0025] Figure 2 This is a schematic diagram of the installation of a pair of inner chain plates and sleeves according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the sleeve according to an embodiment of the present utility model.

[0027] Figure 4 This is a structural schematic diagram of an outer chain plate according to an embodiment of the present utility model.

[0028] Figure 5 This is a schematic diagram of the connecting pin according to an embodiment of the present utility model.

[0029] Figure 6 This is a structural schematic diagram of a threaded long shaft pin according to an embodiment of the present utility model.

[0030] Figure 7 This is a schematic diagram of the installation of a pair of inner chain plates and sleeves according to another embodiment of the present utility model.

[0031] Figure label:

[0032] 10-Chain; 12-Inner link; 13-First inner link plate; 14-Second inner link plate; 15-Circular hole; 16-Sleeve insertion hole;

[0033] 18-Outer link; 19-First outer link plate; 20-Second outer link plate; 21-First pin insertion hole; 22-Second pin insertion hole; 30-Sleeve; 32-Insertion part; 34-Inner hole; 40-Connecting pin; 42-Top part; 43-Pin body; 44-Pin hole; 50-Threaded long shaft pin; 52-Threaded part; 54-Middle part; 56-Pin rod; 60-Wear-resistant part. Detailed Implementation

[0034] The technical solutions of the embodiments will now be clearly and completely described with reference to the accompanying drawings of this application. Those skilled in the art will understand that the embodiments described in the specification are only a part of the embodiments of this utility model invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort are within the scope of protection of this utility model.

[0035] In the description of this patent specification, the orientations or positional relationships indicated by terms such as "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "longitudinal," "transverse," "center," "vertical," "horizontal," "length," "width," "thickness," "clockwise," and "counterclockwise" are based on the accompanying drawings. These orientations and positional relationships are merely for the convenience of describing the embodiments involved in the technical innovation of this utility model and should not be construed as limiting the scope of protection of the claims. Furthermore, those skilled in the art will understand that the terms "first" and "second" used in this specification to describe various components are only for distinguishing one component from another and have no sequential meaning; the corresponding components should not be limited by these terms.

[0036] The chain of this invention is used in a shallow trench sorting machine. The chain 10 has multiple inner links 12 and multiple outer links 18. As shown, the length direction of the chain is defined as the X direction, and the width direction is defined as the Y direction, with the length direction X and width direction Y being orthogonal. The inner links 12 and outer links 18 are connected in series in an alternating manner along the length direction (X direction). Each inner link 12 includes a pair of inner links, which are arranged along... Figure 1 The outer links 18 are arranged opposite each other and separated in the width direction (Y direction). Each outer link 18 includes a pair of outer links, which are also arranged along... Figure 1 The portions shown are opposite each other in the width direction (Y direction) and arranged to sandwich the portions of the first pair of inner chain plates and the second pair of inner chain plates from the outside. Both the inner and outer chain plates are roughly rectangular plates with rounded corners at both ends.

[0037] In this application specification, each inner link 12 includes a pair of inner link plates comprising a first inner link plate 13 and a second inner link plate 14, and each outer link 18 includes a pair of outer link plates comprising a first outer link plate 19 and a second outer link plate 20. The first inner link plates 13 and 14 in each inner link 12 are arranged parallel to each other and spaced apart by a first distance, and the first outer link plates 19 and 20 in each outer link 18 are arranged parallel to each other and spaced apart by a second distance. The first outer link plates 19 and 20 are abutted against the first inner link plates 13 and 14 from their outer sides. The pair of outer link plates are arranged along the width direction outside two adjacent inner link sections, and at least sandwich portions of the preceding pair of inner link plates and portions of the following pair of inner link plates.

[0038] like Figure 2As shown, each inner link plate 13 or 14 has a circular hole 15 and a sleeve insertion hole 16 formed at both ends along its length, wherein the sleeve insertion hole and the circular hole penetrate the inner link plate along its thickness. The first inner link plate 13 and the second inner link plate 14 are opposite each other and arranged along the width direction such that the circular hole of the first inner link plate 13 faces the sleeve insertion hole of the second inner link plate 14, and the sleeve insertion hole of the first inner link plate 13 faces the circular hole of the second inner link plate 14. The chain 10 also includes a plurality of cylindrical sleeves 30. (As shown...) Figure 2 and Figure 3 As shown, each sleeve 30 includes a first end and a second end opposite to the first end and of a different shape. The first end of the sleeve 30 is formed with an insertion portion 32 adapted to the sleeve insertion hole 16, which can be inserted into the sleeve insertion hole of the inner link plate for engagement with the inner link plate. The sleeve has an inner hole 34 extending through both ends. During assembly, two sleeves 30 are assembled between a pair of inner link plates to form an inner link 12. The insertion portions 32 of the two sleeves 30 are arranged in opposite directions between the pair of inner link plates. The insertion portion 32 of each sleeve 30 is inserted into the sleeve insertion hole 16 of one inner link plate. In one embodiment, the top end face of the insertion portion 32 of the sleeve 30 is flush with the outer surface of the inner link plate. The second end face of the sleeve 30 contacts the inner surface of the other inner link plate, and the inner hole 34 of the sleeve 30 is aligned with the circular hole 15 of the other inner link plate.

[0039] In an optional embodiment of this application, the sleeve insertion hole 16 is preferably a straight-edged elliptical hole. The insertion portion is formed by creating two opposing stepped grooves on the outer surface of the first end of the sleeve 30. When the insertion portion is inserted into the straight-edged elliptical hole, the groove wall of the stepped groove connects with the straight edge of the straight-edged elliptical hole. In an optional embodiment, the inner diameter of the sleeve's inner bore can be less than or equal to the distance between the two straight edges of the straight-edged elliptical hole, and the distance between the two symmetrical arcs can be approximately equal to the outer diameter of the sleeve.

[0040] One pair of outer link 18 has two pin insertion holes formed at both ends along its length on one of its outer link plates. For example... Figure 4 As shown, the first outer chain plate 19 has first pin insertion holes 21 formed at both ends along its length. The second outer chain plate 20 has second pin insertion holes 22 formed at both ends along its length. The diameter of the first pin insertion hole 21 is slightly smaller than the diameter of the second pin insertion hole 22. In one embodiment, the diameter of the first pin insertion hole 21 is about 0.5 mm smaller than the diameter of the second pin insertion hole 22.

[0041] like Figure 5 and Figure 6 As shown, the chain 10 also includes a cylindrical connecting pin 40, which includes a top portion 42 and a pin body 43. The outer diameter of the pin body 43 is slightly smaller than the outer diameter of the top portion 42. A transverse through pin hole 44 is formed at the end of the pin body 43 away from the top portion 42.

[0042] The chain 10 also includes a threaded long shaft pin 50, which includes a threaded portion 52, a middle portion 54, and a pin 56. The middle portion is located between the threaded portion 52 and the pin 56. The middle portion 54 has a cylindrical body with a circular boss on it. The outer diameter of the cylindrical body is slightly larger than the outer diameter of the pin 56.

[0043] In an optional embodiment, the outer link 18 includes two types: a first outer link and a second outer link. The difference between the first and second outer link is that the first and second outer link plates are reversed, such that the outer link plate with the smaller diameter first pin insertion hole 21 in the first outer link is arranged above, and the outer link plate with the smaller diameter first pin insertion hole 21 in the second outer link is arranged below. Specifically, the first outer link plate in the first outer link and the second outer link plate in the second outer link are on the same horizontal plane, and the second outer link plate in the first outer link and the first outer link plate in the second outer link are on the same horizontal plane.

[0044] The chain can be arranged such that a second outer link is set every two first outer link links, or that a second outer link is set every three first outer link links.

[0045] During assembly, the first outer link is fixedly connected to the inner link 12 via a connecting pin 40. The first outer link is arranged such that the first outer link plate 19 is located above the second outer link plate 20 (along the broadband direction Y). The connecting pin 40 passes from bottom to top through the second pin insertion hole 22 of the second outer link plate 20 of the first outer link, the circular hole 15 or sleeve insertion hole 16 of one of the pair of inner link plates, the inner hole 34 of the sleeve 30, the sleeve insertion hole 16 or circular hole 15 of the other of the pair of inner link plates, and the first pin insertion hole 21 of the first outer link plate 19 of the first outer link. The tip 42 of the connecting pin is at least partially inserted into the second pin insertion hole 22 of the second outer link plate 20. At this time, the axis of the connecting pin 40 is coaxial with the axis of the inner hole of the sleeve 30 and the axis of the circular hole 15 of the inner link plate. A rivet is installed in the pin hole 44 on the pin body 43 away from the tip 42, thereby fixing the pin to the inner and outer links and preventing it from falling off.

[0046] The second outer link is fixedly connected to the inner link via the threaded long shaft pin 50. The second outer link is arranged such that the second outer link plate 20 is located above the first outer link plate 19 (along the wide Y direction). The threaded long shaft pin 50 passes from top to bottom through the second pin insertion hole 22 of the second outer link plate 20 of the second outer link, the circular hole 15 or sleeve insertion hole 16 of one of the pair of inner link plates, the inner hole 34 of the sleeve 30, the sleeve insertion hole 16 or circular hole 15 of the other of the pair of inner link plates, and the first pin insertion hole 21 of the first outer link plate 19 of the second outer link. At least part of the post of the intermediate portion 54 is inserted into the second pin insertion hole 22 of the second outer link plate 20 of the second outer link. A scraper can be mounted on the threaded portion using a nut. After the chain is installed on the shallow trough sorter, the scraper is mounted on the threaded portion of the threaded long shaft pin, and when the chain is driven, the scraper can move forward with the chain.

[0047] like Figure 7 As shown, in a further optional embodiment, the side surfaces of the first and second inner chain plates 13 and 14 are metallurgically bonded with wear-resistant portions 60, which are disposed on the side surfaces adjacent to the circular holes 15 and sleeve insertion holes 16 of the inner chain plates.

[0048] The wear-resistant part includes vertical wear-resistant ribs that protrude a certain height from the side surface. Figure 7 The diagram shows two spaced-apart vertical wear-resistant ribs. The wear-resistant portion is made of a hard alloy harder than the inner chain plate material. In other embodiments, the wear-resistant portion 60 can be formed into a wear-resistant point by metallurgical bonding. This wear-resistant point also protrudes from the side surface of the inner chain plate. In this embodiment of the invention, the wear-resistant portion 60 is preferably located on the side surface defined by the inner diameter line of the sleeve 30 perpendicular to the chain length direction X. Thus, each inner chain plate has two wear-resistant portions on one side surface and four wear-resistant portions on both sides.

[0049] In an optional embodiment, the side surface of the outer chain plate is also metallurgically bonded with a wear-resistant portion, which is disposed on the side surface next to the pin insertion hole of the outer chain plate. The wear-resistant portion includes wear-resistant points or vertical wear-resistant ribs protruding from the side surface. In this embodiment of the invention, the wear-resistant portion 60 of the outer chain plate is preferably disposed at a position on the side surface defined by the diameter line direction of the pin insertion hole perpendicular to the chain length direction X. Thus, each outer chain plate has two wear-resistant portions on one side surface and four wear-resistant portions on both side surfaces.

[0050] The chain provided in this embodiment of the invention saves material on the bushing and reduces the need for specific processing on one end of the bushing, thus increasing production speed and significantly reducing chain production costs. The wear-resistant portion enhances the chain's wear resistance and reduces the occurrence of chain breakage.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A chain for a shallow trench sorting machine, comprising a plurality of inner links (12) and a plurality of outer links (18) connected in series in an alternating manner along its length, wherein the inner links include a pair of opposing inner links (13, 14), and the outer links include a pair of opposing outer links (19, 20), characterized in that, The chain also includes: Each inner chain plate has a circular hole (15) and a sleeve insertion hole (16) at both ends. The pair of inner chain plates are arranged separately in the width direction such that the circular hole (15) of one inner chain plate corresponds to the sleeve insertion hole (16) of the other inner chain plate. Multiple sleeves (30) have a first end and a second end opposite to the first end and different in shape. The first end of the sleeve is formed with an insertion part (32). Two sleeves (30) are arranged between a pair of inner chain plates (13, 14) with opposite ends. The insertion part (32) of one sleeve (30) is inserted into the sleeve insertion hole (16) of one of the pair of inner chain plates. The end face of the second end of the sleeve contacts the inner surface of the other inner chain plate and the inner hole of the sleeve is aligned with the circular hole (15) of the other inner chain plate. Each outer link plate has two pin insertion holes (21, 22) at both ends, and the pair of outer link plates (19, 20) are arranged separately along the width direction outside the pair of inner link plates (13, 14) of the inner link; and, Multiple fixing pins, each of which passes through a pin insertion hole in the outer link plate, a circular hole or sleeve insertion hole in the inner link plate, and the inner hole of the sleeve, to fix the inner link and the outer link in place.

2. The chain for the shallow trench sorting machine according to claim 1, characterized in that, The sleeve insertion hole (16) includes a straight-edged elliptical hole, and the insertion part includes two opposing stepped grooves on the outer surface of the first end of the sleeve, wherein when the insertion part is inserted into the straight-edged elliptical hole, the groove wall of the stepped groove is connected to the straight edge of the straight-edged elliptical hole; and / or, The axis of the fixing pin is coaxial with the axis of the inner hole of the sleeve and the axis of the circular hole of the inner chain plate.

3. The chain for a shallow trench sorting machine according to claim 1, characterized in that, The outer chain plate includes a first outer chain plate (19) and a second outer chain plate (20). Each outer chain plate has two pin insertion holes (21, 22) at both ends. The first outer chain plate (19) has two first pin insertion holes (21), and the second outer chain plate (20) has two second pin insertion holes (22). The diameter of the first pin insertion hole is slightly smaller than the diameter of the second pin insertion hole.

4. The chain for the shallow trench sorting machine according to claim 3, characterized in that, The plurality of external links include a first external link and a second external link with the links being reversed. The first external link in the first external link and the second external link in the second external link are on the same horizontal plane, and the second external link in the first external link and the first external link in the second external link are on the same horizontal plane. The plurality of external links are arranged such that a second external link is set every two or three first external links.

5. The chain for a shallow trench sorting machine according to claim 4, characterized in that, The fixing pin includes a connecting pin (40) and a threaded long shaft pin (50), wherein the first outer link is fixedly connected to the inner link through the connecting pin (40), and the second outer link is fixedly connected to the inner link through the threaded long shaft pin (50).

6. The chain for a shallow trench sorting machine according to claim 5, characterized in that, The connecting pin (40) includes a top end (42) and a pin body (43). The diameter of the top end (42) is slightly larger than the diameter of the pin body (43). The connecting pin (40) passes from bottom to top through the second pin insertion hole (22) of the second outer chain plate (20) of the first outer chain link, the circular hole (15) or sleeve insertion hole (16) of one of the pair of inner chain plates, the inner hole (34) of the sleeve (30), the sleeve insertion hole (16) or circular hole (15) of the other of the pair of inner chain plates, and the first pin insertion hole (21) of the first outer chain plate (19) of the first outer chain link. The top part (42) is at least partially inserted into the second pin insertion hole (22) of the second outer chain plate (20).

7. The chain for a shallow trench sorting machine according to claim 5, characterized in that, The threaded long shaft pin includes a threaded portion (52), a pin (56), and an intermediate portion (54) located between the threaded portion (52) and the pin (56). The intermediate portion (54) has a cylindrical body with a boss on the body. The diameter of the cylindrical body is slightly larger than the diameter of the pin (56). The threaded long shaft pin (50) passes from top to bottom through the second pin insertion hole (22) of the second outer link plate (20) of the second outer link, the circular hole (15) or sleeve insertion hole (16) of one of the pair of inner links, the inner hole (34) of the sleeve (30), the sleeve insertion hole (16) or circular hole (15) of the other of the pair of inner links, and the first pin insertion hole (21) of the first outer link plate (19) of the second outer link. The column of the middle part (54) is at least partially inserted into the second pin insertion hole (22) of the second outer link plate (20) of the second outer link.

8. The chain for a shallow trench sorting machine according to any one of claims 1 to 7, characterized in that, The side surface of the inner chain plate is formed with a wear-resistant part by metallurgical bonding, and the wear-resistant part is disposed on the side surface next to the circular hole and the sleeve insertion hole of the inner chain plate.

9. The chain for a shallow trench sorting machine according to claim 8, characterized in that, The wear-resistant part includes at least one wear-resistant point or vertical wear-resistant rib protruding from the side surface of the inner chain plate, and the material of the wear-resistant part is a hard alloy that is harder than the material of the inner chain plate.

10. The chain for a shallow trench sorting machine according to claim 9, characterized in that, The side surface of the outer chain plate is also formed with a wear-resistant part by metallurgical bonding. The wear-resistant part is provided on the side surface next to the pin insertion hole of the outer chain plate and includes at least one wear-resistant point or vertical wear-resistant rib protruding on the side surface.

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