A sealed structure chain

Abstract

A sealed chain structure, relating to the field of chain sealing technology, includes a chain body composed of alternating inner and outer links. Each inner link comprises two opposing inner chain plates, with a sleeve connecting the opposing inner chain plate connection holes. Each outer link comprises two opposing outer chain plates, with a pin connecting the opposing outer chain plate connection holes. The pin's two ends are respectively interference-fitted with the outer chain plate connection holes. The sleeve's two ends are interference-fitted with the inner chain plate connection holes and extend beyond the outer side of the inner chain plates. The pin passes through an adjacent sleeve and has a clearance fit with the sleeve. A sealing ring structure connects the inner and outer chain plates, surrounding the outer wall of the sleeve extending beyond the inner chain plates. The sealing ring structure forms three seals at its contact points with the outer surface of the inner chain plates and one seal at its contact points with the inner surface of the outer chain plates. This invention can significantly improve the sealing and lubrication effects of the chain hinge pair, extending its service life.

Description

Technical Field

[0001] This invention relates to the field of chain sealing technology, specifically to a sealing structure chain. Background Technology

[0002] In certain special environments with high levels of dust or particulate matter, such as steel mills, mines, coal mines, and ports, the wear resistance and sealing performance of chains are critical. Failure to meet these requirements can severely impact the normal operation of equipment. For instance, mining machinery chains are widely used in mining equipment, and most of the chains used are conveyor chains designed and manufactured using traditional structures and processes. Dust and particulate matter can easily enter the hinges, causing rapid wear and ultimately chain failure. Utility Model Content

[0003] This invention discloses a sealing structure chain that improves the strength and service life of the sealing ring, enhances the lubrication and sealing effect of the hinge, reduces hinge wear, and extends the service life of the chain.

[0004] To achieve the above objectives, the technical solution of this invention is as follows:

[0005] A sealed chain structure includes a chain body composed of alternating inner and outer links. Each inner link includes two opposing inner chain plates, with a sleeve connecting the opposing inner chain plate connection holes. Each outer link includes two opposing outer chain plates, with a pin connecting the opposing outer chain plate connection holes. The pin's two ends are respectively press-fitted with the outer chain plate connection holes. The sleeve's two ends are press-fitted with the inner chain plate connection holes and extend beyond the outer side of the inner chain plates. The pin passes through an adjacent sleeve and has a clearance fit with the sleeve. A sealing ring structure connects the inner and outer chain plates. The sealing ring structure surrounds the outer wall of the sleeve extending beyond the inner chain plate. The sealing ring structure forms three seals at its contact points with the outer surface of the inner chain plate and one seal at its contact points with the inner surface of the outer chain plate.

[0006] Preferably, the sealing ring structure includes a sealing material and a metal skeleton disposed inside the sealing material. The sealing material has a central hole, the inner wall of which covers the outer wall of the sleeve and is interference-fitted with the outer wall of the sleeve without relative rotation. The end of the sealing material facing the outer chain plate is in sealing contact with the inner surface of the outer chain plate, allowing the contact surface between the outer chain plate and the sealing ring structure to rotate relative to each other. The metal skeleton is an annular plate structure, which is coaxially embedded in the sealing material.

[0007] Preferably, the end of the sealing material that contacts the outer chain plate has a frustum-shaped structure, and the lower edge of the frustum-shaped structure extends outward in the same direction to form an extension; the bottom of the sealing material is provided with a first sealing ring, a second sealing ring, and a third sealing ring in sequence from the inside to the outside, and the first sealing ring, the second sealing ring, and the third sealing ring are used to achieve three seals on the outer surface of the inner chain plate and can rotate relative to the outer surface of the inner chain plate.

[0008] Preferably, the outer surface of the inner chain plate is coaxially provided with an annular groove around the sleeve, and the bottom end of the third sealing ring is in sealing contact with the bottom of the annular groove; the bottom of the second sealing ring is in sealing contact with the outer surface of the inner chain plate where the inner side of the annular groove is located; the bottom of the first sealing ring is in sealing contact with the outer surface of the inner chain plate near the sleeve, and the inner wall of the first sealing ring is part of the inner wall of the central hole.

[0009] Preferably, the outer edge of the metal skeleton extends beyond the outer side of the sealing material to form an outer ring of the metal skeleton, and the diameter of the outer ring of the metal skeleton is larger than the diameter of the third sealing ring.

[0010] Preferably, both ends of the outer chain plate are bent toward the inner chain plate to form a bending structure.

[0011] Preferably, the pin has an oil passage extending radially through its outer surface, and an oil injection hole is provided axially. The oil injection hole communicates with the oil passage, and an oil injection device is installed at the outer port of the oil injection hole.

[0012] Preferably, the oil injection device is an oil cup; the thickness A at the bottom of the second sealing ring is less than the thickness B at the bottom of the third sealing ring, the thickness B is less than the thickness C at the bottom of the first sealing ring, and the thickness C is less than the width of the contact surface between the sealing material and the outer chain plate.

[0013] This novel sealed chain structure has the following beneficial effects:

[0014] 1. The outer chain plate is designed with a bent structure along the length of the chain to prevent large particles of dust and impurities from entering the gap between the inner and outer chain plates, thereby reducing wear on the sealing ring and increasing its service life.

[0015] 2. By increasing the contact area between the outer chain plate and the sealing ring, designing a triple sealing structure between the inner chain plate and the sealing ring, and using an interference fit design between the sleeve and the sealing ring, dust is completely prevented from entering the hinge through the gap between the inner and outer chain plates, achieving the purpose of sealing and wear resistance.

[0016] 3. An oil injection device is provided through the pin shaft, which injects lubricating grease into the hinge space through the oil passage to achieve wear resistance.

[0017] In summary, this new design significantly improves the sealing effect of the sleeve-pin hinge pair, preventing dust and particulate matter from entering the hinge pair and avoiding wear caused by dust and particulate matter. In addition, it also significantly improves the lubrication effect between the pin and sleeve, enhancing wear resistance. Through these features, the service life of the chain is extended. It can meet the needs of harsh working conditions and can replace chains using existing conventional processes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this novel invention;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 This is a cross-sectional view of the sealing ring structure;

[0021] Figure 4 This is a top view of the sealing ring structure;

[0022] Figure 5 This is a bottom view of the sealing ring structure.

[0023] Reference numerals: 1. Outer chain plate; 11. Bending structure; 2. Inner chain plate; 21. Annular groove; 3. Sleeve; 31. Sleeve portion protruding from inner chain plate; 4. Pin; 41. Oil passage; 5. Sealing ring structure; 51. Sealing material; 52. Metal skeleton; 53. Contact surface with outer chain plate; 531. Extension; 54. Third sealing ring; 55. Second sealing ring; 56. First sealing ring; 57. Outer ring of metal skeleton; 58. Center hole; 6. Oil injection device. Detailed Implementation

[0024] The following is a detailed description of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this invention.

[0026] This novel sealed chain structure, such as Figure 1 , 2As shown in Figure 3, the chain body comprises several inner and outer links connected alternately. Each inner link includes two opposing inner chain plates 2, with a sleeve 3 connecting the opposing inner chain plate connecting holes of the two inner chain plates 2. Each outer link includes two opposing outer chain plates 1, with a pin 4 connecting the opposing outer chain plate connecting holes of the two outer chain plates 1. Both ends of the pin 4 are press-fitted with the connecting holes of the outer chain plates. Both ends of the sleeve 3 are press-fitted with the connecting holes of the inner chain plates 2 and extend out of the inner chain plates 2. On the outer side (reducing the gap between the sleeve 3 and the outer chain plate 1, optimizing the shear stress of the pin 4, and improving the tensile strength of the chain), the pin 4 passes through the adjacent sleeve 3 and is clearance-fitted with the sleeve 3. A sealing ring structure 5 connects the inner chain plate 2 and the outer chain plate 1. The sealing ring structure 5 surrounds and extends outward from the outer wall of the sleeve 3 outside the inner chain plate 2. The sealing ring structure 5 forms three seals at the contact point with the outer surface of the inner chain plate 2 and one seal at the contact point with the inner surface of the outer chain plate 1. Because particles or dust can enter the hinge pair formed by the pin and sleeve, it will cause rapid wear on the pin or sleeve, especially in heavily polluted mining environments. This will lead to rapid failure of the hinge pair and greatly reduce the service life of the chain. This new invention effectively avoids the above problems through the above-mentioned design.

[0027] In this embodiment, as Figure 2 , 3 As shown, the sealing ring structure 5 includes a sealing material 51 and a metal skeleton 52 disposed inside the sealing material 51. The sealing material 51 has a central hole 58. The inner wall of the central hole 58 covers the outer wall of the sleeve 3 and is interference-fitted with the outer wall of the sleeve 3 without relative rotation, so as to achieve a seal between the sealing material and the outer wall of the sleeve, completely preventing dust or particulate matter from entering the hinge pair through the gap between the central hole and the sleeve. The end of the sealing material 51 facing the outer link plate 1 is in sealing contact with the inner surface of the outer link plate, allowing the contact surface between the outer link plate 1 and the sealing ring structure 5 to rotate relative to each other. The metal skeleton 52 is an annular plate structure, which is coaxially embedded in the sealing material 51. The sealing material is selected from commercially available products such as rubber and engineering plastics.

[0028] In this embodiment, as Figure 2 , 3As shown in Figures 4 and 5, the end of the sealing material 51 that contacts the outer chain plate has a frustum-shaped structure to prevent dust or particles from entering the pin sleeve hinge pair along the inner surface of the outer chain plate. The lower edge of the frustum-shaped structure extends outward in the same direction to form an extension 531. The function of the frustum-shaped structure and the extension is to guide dust or particles away from the pin sleeve hinge pair and discharge them out of the chain. The bottom of the sealing material 51 is provided with a first sealing ring 56, a second sealing ring 55, and a third sealing ring 54 coaxially from the inside to the outside. The first sealing ring, the second sealing ring, and the third sealing ring are used to achieve three seals on the outer surface of the inner chain plate and can rotate relative to the outer surface of the inner chain plate to prevent dust or particles from entering the pin sleeve hinge pair along the surface of the inner chain plate.

[0029] In this embodiment, as Figure 2 As shown, the outer surface of the inner chain plate 2 is coaxially provided with an annular groove 21 around the sleeve. The bottom end of the third sealing ring 54 is in sealing contact with the bottom of the annular groove 21. The third sealing ring is used to block dust or particles that settle in the annular groove. The bottom of the second sealing ring 55 is in sealing contact with the outer surface of the inner chain plate 2 where the inner side of the annular groove 21 is located, further improving the sealing effect. The bottom of the first sealing ring 56 is in sealing contact with the outer surface of the inner chain plate near the sleeve 3. The inner wall of the first sealing ring 56 is part of the inner wall of the central hole, thus achieving both sealing of the inner chain plate surface and sealing of the outer wall of the sleeve.

[0030] In this embodiment, as Figure 3 , 4 As shown in Figure 5, the outer edge of the metal skeleton extends beyond the outer side of the sealing material and forms a metal skeleton outer ring 57. The diameter of the metal skeleton outer ring 57 is larger than the diameter of the third sealing ring 54. The function of the metal skeleton is, on the one hand, to shape the sealing material, and on the other hand, the metal skeleton outer ring can guide the dust or particles to settle away from the sleeve. The settled dust or particles are easier to discharge from the chain by gravity. Finally, the metal skeleton outer ring can block large particles and reduce the wear of large particles on the sealing material.

[0031] In this embodiment, as Figure 1 , 2 As shown, the two ends of the outer chain plate 1 are bent toward the inner chain plate 2 to form a bending structure 11, which can minimize the gap between the inner and outer chain plates and reduce the amount of dust or particulate matter intrusion.

[0032] In this embodiment, as Figure 1 , 2 As shown, the pin 4 is provided with an oil passage 41 that penetrates the outer surface of the pin in the radial direction, and the pin 4 is provided with an oil injection hole (e.g., ...) in the axial direction. Figure 2As shown in the figure (not marked), the oil injection hole is connected to the oil passage 41 to introduce lubricating oil into the gap between the pin and the sleeve, thereby improving the wear resistance of the pin-sleeve hinge pair and extending the service life of the chain; an oil injection device 6 is installed at the outer port of the oil injection hole to continuously supply lubricating oil into the oil injection hole.

[0033] In this embodiment, as Figure 1 , 2 As shown in Figure 3, the oil injection device 6 is an oil cup, and a commercially available product is selected; the thickness A at the bottom of the second sealing ring 55 is less than the thickness B at the bottom of the third sealing ring 54, the thickness B is less than the thickness C at the bottom of the first sealing ring 56, and the thickness C is less than the width of the contact surface 53 between the sealing material and the outer chain plate.

Claims

1. A sealed structure chain, comprising a chain body connected by alternately arranged inner links and outer links, the inner link comprising two oppositely arranged inner link plates, and a sleeve connected between the opposite inner link plate connecting holes of the two inner link plates, the outer link comprising two oppositely arranged outer link plates, and a pin shaft connected between the opposite outer link plate connecting holes of the two outer link plates, the pin shaft being in interference fit with the outer link plate connecting holes at both ends, characterized in that: The two ends of the sleeve are interference-fitted with the connecting holes of the inner chain plate and extend out of the outer side of the inner chain plate. The pin passes through the adjacent sleeve and is clearance-fitted with the sleeve. A sealing ring structure is connected between the inner chain plate and the outer chain plate. The sealing ring structure surrounds the outer wall of the sleeve that extends out of the inner chain plate. The sealing ring structure forms three seals with the contact part with the outer surface of the inner chain plate and forms one seal with the contact part with the inner surface of the outer chain plate. ​ 2. A sealing structure chain as described in claim 1, characterized in that: the sealing ring structure includes a sealing material and a metal skeleton disposed inside the sealing material; the sealing material has a central hole; the inner wall of the central hole covers the outer wall of the sleeve and is interference-fitted with the outer wall of the sleeve without relative rotation; one end of the sealing material facing the outer chain plate is in sealing contact with the inner surface of the outer chain plate, allowing the contact surface between the outer chain plate and the sealing ring structure to rotate relative to each other; the metal skeleton is an annular plate structure, and the annular plate structure is coaxially embedded in the sealing material.

3. A chain of the type defined in claim 2, characterized in that: The sealing material has a frustum-shaped structure at one end that contacts the outer chain plate, and the lower edge of the frustum-shaped structure extends outward in the same direction to form an extension. The bottom of the sealing material is provided with a first sealing ring, a second sealing ring, and a third sealing ring in sequence from the inside to the outside. The first sealing ring, the second sealing ring, and the third sealing ring are used to achieve three seals on the outer surface of the inner chain plate and can rotate relative to the outer surface of the inner chain plate.

4. A chain of the type defined in claim 3, characterized in that: The outer surface of the inner chain plate is coaxially provided with an annular groove around the sleeve, and the bottom end of the third sealing ring is in sealing contact with the bottom of the annular groove; the bottom of the second sealing ring is in sealing contact with the outer surface of the inner chain plate where the inner side of the annular groove is located; the bottom of the first sealing ring is in sealing contact with the outer surface of the inner chain plate near the sleeve, and the inner wall of the first sealing ring is part of the inner wall of the central hole.

5. A sealing structure chain as described in claim 4, characterized in that: the outer edge of the metal skeleton extends beyond the outer side of the sealing material and forms an outer ring of the metal skeleton, the diameter of the outer ring of the metal skeleton being larger than the diameter of the third sealing ring.

6. A chain of the type defined in claim 5, characterized in that: The two ends of the outer chain plate are bent toward the inner chain plate to form a bending structure.

7. A sealing structure chain as described in claim 6, characterized in that: the pin shaft is provided with an oil passage penetrating the outer surface of the pin shaft in the radial direction, the pin shaft is provided with an oil injection hole in the axial direction, the oil injection hole is connected to the oil passage, and an oil injection device is installed at the outer port of the oil injection hole.

8. A sealing structure chain as described in claim 7, characterized in that: the oil injection device is an oil cup; the thickness A at the bottom of the second sealing ring is less than the thickness B at the bottom of the third sealing ring, the thickness B is less than the thickness C at the bottom of the first sealing ring, and the thickness C is less than the width of the contact surface between the sealing material and the outer chain plate.

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