Wear-resistant chain

Abstract

The abrasion-resistant chain is formed by connecting a plurality of chain link units in series, one end, provided with an end piece, of a pin shaft is provided with an oil injection hole channel, the oil injection hole channel is arranged in the axial direction of the pin shaft, one end, away from the end piece, of the oil injection hole channel is provided with an oil outlet channel communicated with the oil injection hole channel, and the oil outlet channel is arranged in the direction perpendicular to the axial direction of the pin shaft. The two ends of the oil outlet channel penetrate to the outer wall of the pin shaft. A plugging assembly is arranged at the end, close to the end piece, of the oil injection hole channel and comprises a clamping piece, a pressing piece and a spring. A through hole is formed in the center of the clamping piece, the clamping piece is arranged on the inner wall of the oil injection hole channel, and a clamping groove is formed in the bottom of the through hole; the pressing piece comprises a pressing part, a middle plate and a first connecting part arranged between the pressing part and the middle plate, and a sealing block is arranged below the middle plate; the pressing piece is rotationally arranged in the oil injection hole channel, the middle plate is slidably located in the through hole, the spring is located between the pressing part and the clamping piece, and the sealing block abuts against the side wall of the clamping groove.

Description

Technical Field

[0001] The utility model relates to the technical field of chains, in particular to a wear-resistant chain. Background Art

[0002] Chain is a very common transmission component. The existing chain is basically composed of chain units connected in series, and the chain unit is composed of two inner link plates, two outer link plates, a sleeve, a pin, etc., wherein the two inner link plates are arranged opposite to each other and fixed together by a sleeve, the two inner link plates are located between the two outer link plates, the two outer link plates are fixed together by a pin, and the sleeve is sleeved on the pin.

[0003] In actual applications, the chain is easily worn. For example, the top and bottom of the chain plate are easily worn and corroded in shallow groove track scraper conveying. In addition, during the transmission process, the chain is easily worn over time due to the friction between the sleeve and the pin, which in turn affects the service life of the chain. Utility Model Content

[0004] The main purpose of the utility model is to provide a wear-resistant chain to solve the problem that the chain plates, sleeves and pins in the chain are easily worn.

[0005] To solve the above technical problems, the utility model is implemented as follows: a wear-resistant chain, which is formed by connecting a plurality of groups of chain link units in series, each group of chain link units includes a pin shaft, a sleeve, two outer chain plates arranged opposite to each other, and two inner chain plates arranged opposite to each other, the two inner chain plates are located between the two outer chain plates, the sleeve is arranged between the two inner chain plates, the pin shaft is arranged between the two outer chain plates, the sleeve is sleeved outside the pin shaft, one end of the pin shaft is clamped with the outer chain plate on the corresponding side through an end plate, and the other end thereof is provided with a latch;

[0006] An oil injection channel is provided at one end of the pin shaft end piece, and the oil injection channel is provided along the axial direction of the pin shaft. An oil outlet channel is provided at one end of the oil injection channel away from the end piece and connected thereto, and the oil outlet channel is provided in a direction perpendicular to the axial direction of the pin shaft, and both ends of the oil outlet channel respectively penetrate the outer wall of the pin shaft;

[0007] The oil injection channel is provided with a plugging assembly at one end close to the end piece, and the plugging assembly includes a clamping piece, a pressing piece and a spring; the clamping piece is in an annular shape, and a circular through hole is provided at the center thereof; the clamping piece is arranged on the inner wall of the oil injection channel along the axial direction of the pin shaft, and a clamping groove with a trapezoidal cross section is provided at the bottom of the through hole; the pressing piece includes a pressing part, a middle plate arranged below the pressing part, and a first connecting part arranged between the pressing part and the middle plate and used to connect the two, the middle plate is circular, and the A sealing block is provided at the bottom; the pressing piece is rotatably arranged in the oil filling channel, the pressing part is located at one end of the oil filling channel close to the end plate, and a flow space is provided between the outer wall of the pressing part and the inner wall of the oil filling channel; the middle plate is slidably located in the through hole, and the outer wall of the middle plate is in contact with the inner wall surface of the through hole; the spring is located between the pressing part and the clamping piece, and the two ends of the spring are respectively abutted against the pressing part and the clamping piece; the cross-section of the sealing block is trapezoidal, and the sealing block abuts against the side wall of the clamping groove.

[0008] As a further technical solution, the top and bottom sides of the inner link plate and the top and bottom sides of the outer link plate are welded with long strips of wear-resistant layers along their length direction, and the thickness of the wear-resistant layers is 2 mm.

[0009] As a further technical solution, the wear-resistant layer is made of high chromium alloy.

[0010] As a further technical solution, two end grooves are provided at both ends of the sleeve, and the two end grooves at each end of the sleeve are symmetrically arranged on both sides of the outer wall of the corresponding end of the sleeve, and a connecting portion is formed at the end of the sleeve; corresponding connecting holes are provided on the inner link plate, and the connecting holes are interference fit with the connecting portion, and the end grooves abut against the inner wall of the inner link plate.

[0011] As a further technical solution, the oil injection channel includes an oil injection hole and an axial channel connected to the oil injection hole, the oil injection hole is arranged at one end close to the end plate, the axial channel extends from the end of the oil injection hole away from the end plate to the middle position of the pin shaft, and is connected to the oil outlet channel; the diameter of the axial channel gradually decreases from the end close to the oil injection hole to the end close to the oil outlet channel; the sealing assembly is arranged in the oil injection hole.

[0012] As a further technical solution, a threaded portion is provided on the inner wall of the oil filling hole, and a thread is correspondingly provided on the outer wall of the clamping member, and the clamping member and the oil filling hole are threadedly connected.

[0013] As a further technical solution, a gasket is provided above the clamping part, and an annular groove is provided on the outer periphery of the bottom of the gasket, and an annular sealing ring is provided in the annular groove; the gasket is located on the upper surface of the clamping part and is fixedly connected to the clamping part by bolts, the bottom of the sealing ring abuts against the upper surface of the clamping part, and the outer wall of the sealing ring abuts against the inner wall of the oil filling hole.

[0014] As a further technical solution, an oil inlet pipe is provided on the pressing portion along the axial direction of the pin shaft, one end of the oil inlet pipe passes through the pressing portion, and the other end thereof extends to above the middle plate; the end of the oil inlet pipe close to the middle plate is the oil outlet end, the oil outlet end is inclined, and the end face of the oil outlet end contacts the inner wall of the through hole.

[0015] The beneficial effects of the utility model are:

[0016] 1. The present application sets wear-resistant strips on the top and bottom sides of the inner link plate and the top and bottom sides of the outer link plate, and sets electroplating chrome on the surface of the pin shaft to enhance the hardness of the pin shaft, which can greatly improve the overall wear resistance of the chain and increase its service life.

[0017] 2. The utility model sets an oil filling hole in the pin shaft, which can conveniently inject lubricating oil into the gap between the pin shaft and the sleeve, reduce the friction between the sleeve and the pin shaft, further reduce the wear speed of the chain, and increase the service life of the chain. In addition, a sealing device is set in the oil filling hole, and the oil filling hole can provide a certain oil storage function, without manual frequent oil filling; in addition, the diameter of the axial channel is set to gradually become smaller, which can extend the use time of the lubricating oil filled each time, extend the lubrication effect, and avoid waste of lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the chain of the utility model;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the chain of the utility model from another angle;

[0021] Figure 3 It is a disassembly schematic diagram of the inner chain plate, sleeve and pin of the chain of the utility model;

[0022] Figure 4 It is a cross-sectional view of the plugging component inside the pin shaft in the utility model;

[0023] Figure 5 for Figure 4 A magnified view of middle;

[0024] Figure 6 is a cross-sectional view of the plugging assembly in the pin shaft in an open state;

[0025] Figure 7 for Figure 6 Enlarged view of middle B;

[0026] Figure 8 This is a disassembled diagram of the pin and sealing assembly.

[0027] Description of Reference Numerals

[0028] 1. Inner link plate; 10. Connecting hole; 2. Outer link plate; 3. Pin; 30. Oil injection channel; 300. Oil injection hole; 301. Axial channel; 31. Oil outlet channel; 32. Threaded portion; 4. Sleeve; 40. End groove; 41. Connecting portion; 5. Blocking assembly; 50. Connecting piece; 500. Through hole; 501. Slot; 51. Pressing piece; 510. Pressing portion; 511. Middle plate; 512. First connecting portion; 513. Sealing block; 514. Second connecting portion; 515. Bottom plate; 517. Oil inlet pipe; 518. Oil outlet end; 52. Spring; 53. Gasket; 54. Sealing ring; 55. Ring groove; 6. Wear-resistant layer; 7. End piece; 8. Pin. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0030] like Figure 1-Figure 6 As shown, the utility model proposes a wear-resistant chain, which is composed of a plurality of chain link units connected in series, each of which includes a pin shaft 3, a sleeve 4, two outer link plates 2 arranged opposite to each other, and two inner link plates 1 arranged opposite to each other, the two inner link plates 1 are located between the two outer link plates 2, the sleeve 4 is arranged between the two inner link plates 1, the pin shaft 3 is arranged between the two outer link plates 2, the sleeve 4 is sleeved outside the pin shaft 3, one end of the pin shaft 3 is clamped with the outer link plate 2 on the corresponding side through the end plate 7, and the other end thereof is provided with a latch 8. There is a very small gap between the pin shaft 3 and the sleeve 4. The above contents are all prior art.

[0031] Based on the existing inner link plate 1 and outer link plate 2, the present application has a long strip of wear-resistant layer 6 welded on the top and bottom sides of the inner link plate 1 and the top and bottom sides of the outer link plate 2 along their length direction, wherein the wear-resistant layer 6 has a thickness of 2 mm and a width of 10 mm; Figure 1-Figure 3 As shown, the wear-resistant layer 6 is made of high chromium alloy; thereby, the wear resistance of the chain plate can be increased. In addition, in the present application, a layer of electroplated chrome is provided on the outer surface of the pin shaft 3, thereby making the pin shaft 3 brighter, harder, and more lubricated, making it more wear-resistant and extending its service life.

[0032] In addition, if Figure 3As shown, in the present application, two slots 501 are provided at both ends of the sleeve 4, wherein the two slots 501 at each end of the sleeve 4 are symmetrically arranged on both sides of the outer wall of the sleeve 4 at the end, and a connecting portion 41 is formed at the end of the sleeve 4. A connecting hole 10 is correspondingly provided on the inner link plate 1, and the connecting hole 10 has the same shape as the connecting portion 41. The connecting portion 41 is inserted into the connecting hole 10 and has an interference fit with the connecting hole 10; and the side wall of the slot 501 abuts against the inner wall of the inner link plate 1, thereby abutting against the inner link plate 1 on the side of the inner link plate 1 away from the outer link plate 2; it can prevent the sleeve 4 from being worn after the chain is used for a long time, and the interference fit between the inner link plate 1 and the end of the sleeve 4 is loosened, so that the inner link plate 1 slides on the sleeve 4 and other unstable situations occur; and the setting of the slot 501 increases the tensile strength and elongation between the sleeve 4 and the pin 3.

[0033] In addition, in order to reduce the wear rate of the chain, the present application provides an oil injection channel 30 on the pin 3. Figure 4-Figure 8 As shown, one end of the pin shaft 3 where the end piece 7 is provided is provided with an oil injection channel 30, and the oil injection channel 30 is provided along the axial direction of the pin shaft 3, and the end of the oil injection channel 30 close to the end piece 7 extends to the end piece 7, that is, it penetrates to the end of the end piece 7; and the end of the oil injection channel 30 away from the end piece 7 is provided with an oil outlet channel 31 connected thereto, and the oil outlet channel 31 is provided in a direction perpendicular to the axial direction of the pin shaft 3, and the two ends of the oil outlet channel 31 respectively penetrate to the outer wall of the pin shaft 3, that is, the oil outlet channel 31 can be connected to the gap between the sleeve 4 and the pin shaft 3. The oil injection channel 30 is provided at the end of the pin shaft 3 where the end piece 7 is provided, which can avoid affecting the setting of the latch 8. In addition, Figure 4As shown, the oil injection channel 30 in the present application includes an oil injection hole 300 and an axial channel 301 connected to the oil injection hole 300. The oil injection hole 300 is arranged at one end close to the end plate 7 and arranged along the axial direction of the pin shaft 3; and the axial channel 301 is also arranged along the axial direction of the pin shaft 3, and the axial channel 301 extends from the end of the oil injection hole 300 away from the end plate 7 to the middle position of the pin shaft 3, and is connected to the oil outlet channel 31. The diameter of the axial channel 301 gradually decreases from the end close to the oil injection hole 300 to the end close to the oil outlet channel 31. In the present application, lubricating oil can be poured into the oil injection hole 300, and the lubricating oil flows into the oil outlet channel 31 along the axial channel 301, and finally flows into the gap between the sleeve 4 and the pin shaft 3, thereby lubricating the sleeve 4 and the pin shaft 3 and reducing the wear rate between the two. The diameter of the axial channel 301 gradually decreases, which can reduce the flow rate of the lubricating oil and make it slowly flow into the gap between the sleeve 4 and the pin shaft 3. Among them, the lubricating oil only plays a role of lubrication. As long as there is a layer of lubricating oil on the outer wall of the pin 3 or the inner wall of the sleeve 4, a good lubricating effect can be achieved. The oil filling hole 300 in the chain itself can assume a certain oil storage function. The setting of the gradually decreasing diameter of the axial channel 301 can make the lubricating oil poured into the oil filling hole 300 slowly flow into the gap, thereby extending the use time of the lubricating oil filled each time and the lubricating effect. It is prevented that the filled lubricating oil quickly flows into the gap between the sleeve 4 and the pin 3, resulting in excessive lubrication between the sleeve 4 and the pin 3, causing waste of lubricating oil. In addition, an oil storage material, such as a sponge, etc., can be set in the oil filling hole 300 of the chain itself, so that the excess lubricating oil can be stored. The lubricating oil stored in the oil storage material can supplement the lubricating oil in the gap between the sleeve 4 and the pin 3, so that there is no need to manually inject lubricating oil into the chain frequently.

[0034] In addition, in this application, Figure 4 As shown, a plugging assembly 5 is provided at one end of the oil injection hole 300 close to the end piece 7, and the plugging assembly 5 includes a clamping member 50, a pressing member 51 and a spring 52. The plugging assembly 5 is arranged in the oil injection hole 300 in the oil injection channel 30.

[0035] like Figure 4 and Figure 8 As shown, the clamping member 50 is in a circular shape, with a circular through hole 500 at its center. The clamping member 50 is arranged on the inner wall of the oil injection channel 30 along the axial direction of the pin shaft 3. In this embodiment, the clamping member 50 is arranged on the inner wall of the oil injection hole 300 in the oil injection channel 30; wherein a threaded portion 32 is arranged at a corresponding position of the inner wall of the oil injection hole 300, and a thread is correspondingly arranged on the outer wall of the clamping member 50, and the clamping member 50 and the oil injection hole 300 are threadedly connected. In addition, a groove 501 with a trapezoidal cross section is arranged at the bottom of the through hole 500, and the groove 501 is located below the through hole 500 and is arranged inside the clamping member 50, and the center of the groove 501 is connected to the through hole 500.

[0036] In addition, the pressing member 51 includes a pressing portion 510, a middle plate 511 disposed below the pressing portion 510, and a first connecting portion 512 disposed between the pressing portion 510 and the middle plate 511 and used to connect the two; wherein the pressing portion 510, the first connecting portion 512 and the middle plate 511 are integrally formed. In the present application, a bottom plate 515 is disposed below the middle plate 511, a second connecting portion 514 is disposed between the middle plate 511 and the bottom plate 515 for connecting the two, and the middle plate 511, the bottom plate 515, and the second connecting portion 514 are also integrally formed. The middle plate 511 is circular, and a sealing block 513 is disposed below the middle plate 511, and the sealing block 513 can be clamped between the middle plate 511 and the bottom plate 515; wherein the cross section of the sealing block 513 is trapezoidal, the area of ​​the bottom plate 515 is smaller than the area of ​​the bottom of the sealing block 513, and the bottom plate 515 is located at the center of the sealing block 513.

[0037] In the present application, the pressing member 51 is rotatably disposed in the oil injection channel 30 (i.e., rotatably disposed in the oil injection hole 300), wherein the pressing portion 510 is located at one end of the oil injection channel 30 close to the end piece 7 (i.e., located at one end of the oil injection hole 300 close to the end piece 7), and a flow space is provided between the outer wall of the pressing portion 510 and the inner wall of the oil injection channel 30, i.e., the cross-sectional area of ​​the pressing portion 510 is smaller than the cross-sectional area of ​​the oil injection hole 300, and there is a certain gap between the outer wall of the pressing portion 510 and the inner wall of the oil injection hole 30, and they do not abut against each other. The middle plate 511 is slidably disposed in the through hole 500, and the outer wall of the middle plate 511 is in contact with the inner wall surface of the through hole 500; the spring 52 is located between the pressing portion 510 and the clamping member 50, and the two ends of the spring 52 abut against the bottom of the pressing portion 510 and the top of the clamping member 50 respectively; the sealing block 513 abuts against the side wall of the card slot 501.

[0038] In addition, if Figure 4 and Figure 8 As shown, in the present application, a gasket 53 is provided above the clamping member 50, and an annular groove 55 is provided at the outer periphery of the bottom of the gasket 53, and an annular sealing ring 54 is provided in the annular groove 55; the gasket 53 is located on the upper surface of the clamping member 50 and is fixedly connected to the clamping member 50 by bolts, the bottom of the sealing ring 54 abuts against the upper surface of the clamping member 50, and the outer wall of the sealing ring 54 abuts against the inner wall of the oil injection hole 300. Thus, it can be further ensured that the connection between the clamping member 50 and the oil injection hole 300 is blocked by the sealing ring 54, and the sealing performance of the oil injection hole 300 is ensured.

[0039] In the present application, the plugging assembly 5 is used to plug the end of the oil filling hole 300 to prevent the lubricating oil poured into the oil filling hole 300 from flowing out. When filling the oil, the pressing part 510 is first pushed along the axial direction of the pin shaft 3 and in a direction away from the end piece 7, the pressing part 510 compresses the spring 52, and the pressing member 51 moves as a whole in a direction away from the end piece 7. Figure 6 and Figure 7 As shown, at this time, the middle plate 511 leaves the through hole 500 and moves into the slot 501, and the sealing block 513 also moves a distance and no longer abuts against the inner wall of the slot 501. Figure 7 As shown, at this time, a channel is generated between the sealing block 513 and the middle plate 511 and the card slot 501, and then the lubricating oil can flow into the oil filling hole 300 along the channel toward the opening of the oil filling hole 300.

[0040] In addition, if Figure 4 As shown, in the present application, an oil inlet pipe 517 is provided on the pressing portion 510 along the axial direction of the pin shaft 3, one end of the oil inlet pipe 517 passes through the pressing portion 510, and the other end thereof extends to above the middle plate 511; one end of the oil inlet pipe 517 close to the middle plate 511 is an oil outlet end 518, the oil outlet end 518 is inclined, and the end face of the oil outlet end 518 contacts the inner wall of the through hole 500.

[0041] In order to facilitate oil filling, the present application is provided with an oil inlet pipe 517; when filling oil, the port of the oiler or the oil bottle can be inserted into the end of the oil inlet pipe 517 located at one end of the pressing part 510, and then the pressing part 510 is pushed along the axial direction of the pin shaft 3 and in a direction away from the end piece 7, the pressing part 510 compresses the spring 52, and the pressing member 51 moves as a whole in a direction away from the end piece 7, as shown in FIG. Figure 6 and Figure 7 As shown, at this time, as described above, a channel is generated between the sealing block 513 and the middle plate 511 and the card slot 501, and the oil outlet end 518 of the oil inlet pipe 517 also moves into the card slot 501. At this time, the oiler or oil bottle can be used to start oiling, and the lubricating oil flows along the oil outlet end 518 of the oil inlet pipe 517 and into the oil filling hole 300 through the channel between the sealing block 513 and the card slot 501. After the filling is completed, the pressure on the pressing part 510 is removed. At this time, the pressing part 510 returns to its original position under the elastic force of the spring 52, and the entire pressing member 51 also returns to its original position with the pressing part 510, as shown in FIG. Figure 4 and Figure 5 As shown, the sealing block 513 abuts against the inner wall of the slot 501 again to complete the sealing of the oil filling hole 300. The sealing block 513 can be made of a material with a certain degree of softness or elasticity, such as rubber, etc., so as to achieve a better sealing effect.

[0042] The plugging assembly 5 in the present application can facilitate people to perform oil filling operations, and the oil filling can be completed without disassembling the plugging assembly 5. In addition, in order to reduce the process difficulty when manufacturing the pin shaft 3, the present application can only open the oil filling channel 30 and the oil outlet channel 31 on the pin shaft 3 when manufacturing the pin shaft 3, and cut a threaded portion 32 at the corresponding position of the oil filling hole 300 (for later assembly with the clamping member 50). The clamping member 50 with a more special shape and the plugging assembly 5 are both produced separately and assembled later, thereby reducing the production and cutting difficulty of the pin shaft 3.

[0043] The above description is only a preferred embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A wear-resistant chain, which is formed by connecting a plurality of chain link units in series, wherein each chain link unit comprises a pin shaft, a sleeve, two outer link plates arranged opposite to each other, and two inner link plates arranged opposite to each other, wherein the two inner link plates are located between the two outer link plates, the sleeve is arranged between the two inner link plates, the pin shaft is arranged between the two outer link plates, the sleeve is sleeved outside the pin shaft, one end of the pin shaft is clamped with the outer link plate on the corresponding side through an end plate, and the other end thereof is provided with a latch; characterized in that: An oil injection channel is provided at one end of the pin shaft end piece, and the oil injection channel is provided along the axial direction of the pin shaft. An oil outlet channel is provided at one end of the oil injection channel away from the end piece and connected thereto, and the oil outlet channel is provided in a direction perpendicular to the axial direction of the pin shaft, and both ends of the oil outlet channel respectively penetrate the outer wall of the pin shaft; The oil injection channel is provided with a plugging assembly at one end close to the end piece, and the plugging assembly includes a clamping piece, a pressing piece and a spring; the clamping piece is in an annular shape, and a circular through hole is provided at the center thereof; the clamping piece is arranged on the inner wall of the oil injection channel along the axial direction of the pin shaft, and a clamping groove with a trapezoidal cross section is provided at the bottom of the through hole; the pressing piece includes a pressing part, a middle plate arranged below the pressing part, and a first connecting part arranged between the pressing part and the middle plate and used to connect the two, the middle plate is circular, and the A sealing block is provided at the bottom; the pressing piece is rotatably arranged in the oil filling channel, the pressing part is located at one end of the oil filling channel close to the end plate, and a flow space is provided between the outer wall of the pressing part and the inner wall of the oil filling channel; the middle plate is slidably located in the through hole, and the outer wall of the middle plate is in contact with the inner wall surface of the through hole; the spring is located between the pressing part and the clamping piece, and the two ends of the spring are respectively abutted against the pressing part and the clamping piece; the cross-section of the sealing block is trapezoidal, and the sealing block abuts against the side wall of the clamping groove.

2. A wear-resistant chain according to claim 1, characterized in that: The top and bottom sides of the inner link plate and the top and bottom sides of the outer link plate are welded with long strips of wear-resistant layers along their length direction, and the thickness of the wear-resistant layers is 2 mm.

3. A wear-resistant chain according to claim 2, characterized in that: The material of the wear-resistant layer is high chromium alloy.

4. A wear-resistant chain according to claim 1, characterized in that: Two end grooves are provided at both ends of the sleeve, and the two end grooves at each end of the sleeve are symmetrically arranged on both sides of the outer wall of the corresponding end of the sleeve, and a connecting part is formed at the end of the sleeve; the inner link plate is correspondingly provided with connecting holes, the connecting holes are interference fit with the connecting part, and the end grooves are in contact with the inner wall of the inner link plate.

5. A wear-resistant chain according to claim 1, characterized in that: The oil injection channel includes an oil injection hole and an axial channel connected to the oil injection hole, the oil injection hole is arranged at one end close to the end plate, the axial channel extends from the end of the oil injection hole away from the end plate to the middle position of the pin shaft, and is connected to the oil outlet channel; the diameter of the axial channel gradually decreases from the end close to the oil injection hole to the end close to the oil outlet channel; the sealing assembly is arranged in the oil injection hole.

6. A wear-resistant chain according to claim 5, characterized in that: A threaded portion is provided on the inner wall of the oil filling hole, and a threaded portion is correspondingly provided on the outer wall of the clamping piece, and the clamping piece and the oil filling hole are threadedly connected.

7. A wear-resistant chain according to claim 6, characterized in that: A gasket is provided above the clamping part, and an annular groove is provided on the outer periphery of the bottom of the gasket, and an annular sealing ring is provided in the annular groove; the gasket is located on the upper surface of the clamping part and is fixedly connected to the clamping part by bolts, the bottom of the sealing ring abuts against the upper surface of the clamping part, and the outer wall of the sealing ring abuts against the inner wall of the oil filling hole.

8. The wear-resistant chain according to claim 1, characterized in that: An oil inlet pipe is provided on the pressing portion along the axial direction of the pin shaft, one end of the oil inlet pipe passes through the pressing portion, and the other end thereof extends to above the middle plate; the end of the oil inlet pipe close to the middle plate is the oil outlet end, the oil outlet end is inclined, and the end face of the oil outlet end contacts the inner wall of the through hole.

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