Small bridge type drag chain with S-shaped inner side

Abstract

The utility model discloses a small bridge type drag chain with an S-shaped inner side, which belongs to the technical field of drag chains and comprises a plurality of chain link main bodies, a first connector and a second connector, and the adjacent chain link main bodies are rotationally connected and can drive the drag chain to bend in the upper direction and the lower direction. The chain link body comprises the two chain plates, the upper middle portions and the lower middle portions of the chain plates are connected through the first cross beam and the second cross beam, the second cross beam and the chain plates on the two sides are of an integrated structure, the first cross beam is detachably connected with the chain plates on the two sides, cables, oil pipes, air pipes, water pipes and the like can be rapidly installed or maintained without threading, and the maintenance process is greatly simplified. The inner cavity of the drag chain is separated through the partition plate between the first cross beam and the second cross beam, the cable is helped to keep a stable movement track in the stretching or bending process of the drag chain, transverse swinging of the cable is reduced, and the abrasion and fatigue fracture risks caused by disordered movement are reduced. The utility model has the advantages of compact structure and small volume, is suitable for small equipment with limited space, and has high rigidity to meet the basic load requirement.

Description

Technical Field

[0001] This utility model belongs to the field of cable chain technology, and specifically relates to a small inner-opening S-shaped bridge cable chain. Background Technology

[0002] Cable chains are commonly used in mechanical equipment to protect various pipelines such as cables, oil pipes, and air pipes, and can meet the different motion requirements of the equipment. Currently, existing cable chains have a relatively bulky structure and large size, making loading, unloading, and maintenance cumbersome and unsuitable for applications with limited space. At the same time, the cables inside the cable chain are arranged in a disordered manner, which can lead to mutual wear and fatigue breakage of the cables during long-term operation. Utility Model Content

[0003] To solve the above problems, this utility model provides a small, internally open S-shaped bridge cable chain.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A small, internally open S-shaped bridge cable chain includes several chain link bodies and connectors 1 and 2 at both ends. The chain link bodies are sequentially rotatably connected end to end and are used to drive the cable chain to bend in both upward and downward directions. Connectors 1 and 2 are rotatably connected to the chain link bodies at both ends of the cable chain. Each chain link body includes two opposing and parallel chain plates. The middle parts of the upper and lower long sides of the two chain plates are connected by crossbeam 1 and crossbeam 2, respectively. The two ends of crossbeam 1 are detachably connected to the chain plates. Crossbeam 2 is an integral structure with the two chain plates. A movable partition is provided between crossbeam 1 and crossbeam 2 to divide the inner cavity of the cable chain into multiple cavities. The two ends of the partition are detachably connected to crossbeam 1 and crossbeam 2, respectively.

[0006] Furthermore, one end of the crossbeam is rotatably connected to a fixed shaft in the middle of the edge of one side chain plate, and the other end of the crossbeam is engaged with the middle of the edge of the other side chain plate.

[0007] Furthermore, each of the two chain plates has a mounting groove in the middle of its edge. The fixed shaft is located in the mounting groove in the middle of one chain plate, and there is a gap between the fixed shaft and the bottom of the mounting groove. One end of the crossbeam has a sleeve that mates with the fixed shaft. The sleeve is a semi-enclosed structure with a notch, and the notch of the sleeve faces outward. The solid part of the sleeve is placed in the gap between the fixed shaft and the mounting groove. The bottom of the mounting groove in the middle of the other chain plate has a protrusion, and the other end of the crossbeam has a claw that mates with the protrusion. The outer surfaces of the sleeve and the claw are both flat and flush with the outer surface of the chain plate.

[0008] Furthermore, the protruding tongue is located in the middle of the mounting groove. The protruding tongue is an irregular structure with protrusions on both sides at the upper end. The inner side of the upper end of the protruding tongue is an arc surface, and the outer side is a clamping head that cooperates with the clamping claw. The clamping head is a right-angled trapezoidal structure, and its top is a downward-sloping guide surface. The inner root of the clamping claw is an inner arc surface that cooperates with the arc surface of the protruding tongue. The end of the clamping claw is provided with a barb for cooperating with the clamping head on the outer side of the protruding tongue.

[0009] Furthermore, both sides of the root of the sleeve and the claw are provided with protruding eaves, one side of which is fitted with the inner wall of the chain plate, and the other side is rounded to the two sides of the crossbeam.

[0010] Furthermore, the partition consists of several partitions arranged parallel to the two side chain plates. Each partition includes a vertical plate and support platforms at both ends. The support platforms at both ends are respectively attached to the inner surfaces of the first and second crossbeams. Each end of the support platform is provided with a C-shaped buckle that cooperates with the first and second crossbeams. The inner center of the C-shaped buckle is provided with a protrusion. Both sides of the first and second crossbeams are provided with several slots for cooperating with the protrusions.

[0011] Furthermore, the chain plates of several chain links are rotatably engaged through a connecting structure. The first and second joints are rotatably engaged with the chain plates at both ends of the drag chain through a connecting structure. The connecting structure includes a rotating shaft and a positioning hole that rotatably engages with it. The edges of both ends of the chain plate and the edges of the connecting plates of the first and second joints are all arc-shaped.

[0012] The rotating shaft is located at the center of the arc-shaped edge of one end of the chain plate and the connecting plate of the first joint; the positioning hole is located at the center of the arc-shaped edge of the connecting plate of the other end of the chain plate and the connecting plate of the second joint.

[0013] The pivot is located in the middle of the recessed platform on the outer side of the chain plate end. The outer edge of the recessed platform has a fan-shaped limiting groove, with its upper and lower ends extending to the upper and lower sides of the centerline of the chain plate end, respectively. A limiting block is radially provided on the arc-shaped sidewall of the recessed platform, located in the middle of the sidewall. A recessed groove is provided on the inner wall of the chain plate inside the positioning hole. A fan-shaped limiting groove is provided on the inner side of the end edge of the recessed groove, with its upper and lower ends extending to the chain plate end, respectively. On the upper and lower sides of the center line, the second limiting groove cooperates with the first limiting block at the end of the adjacent chain plate; the side wall of the sink is radially provided with a second limiting block that can cooperate with the first limiting groove, the second limiting block is located in the middle of the side wall of the sink, and the side wall of the second limiting groove near the middle of the end of the chain plate is flush with the edge of the first limiting block towards the outer side of the drag chain; the first limiting groove and the second limiting groove have the same curvature and their corresponding central angles are both 90°, which are used to limit the angle of the drag chain bending to the upper and lower sides.

[0014] The connecting plate of the first connector has two slots at a 90° angle at its end edge. The slots can cooperate with the limiting block and are located on the outside of the connecting plate. The two slots face the inside of the cable chain bend. The connecting plate of the second connector has two slots at a 90° angle at its end edge. The slots can cooperate with the limiting block and are located on the inside of the connecting plate. The two slots face the inside of the cable chain bend.

[0015] Furthermore, both the middle plates of connector one and connector two are provided with a row of comb teeth at their ends, with adjacent comb teeth arranged side by side and parallel to the connecting plates on both sides.

[0016] Furthermore, the main body of the chain link, joint one, and joint two are all injection molded from engineering plastics.

[0017] Furthermore, the intermediate plates and partitions of the first and second connectors are provided with weight reduction holes, and the weight reduction holes on the partitions are located on the inner side of the cable chain bend; the outer side of the middle part of the chain plate is provided with a weight reduction groove.

[0018] The technological advancements achieved by this invention compared to existing technologies are as follows:

[0019] The main body of this utility model consists of chain links that rotate sequentially from end to end, driving the cable chain to bend in both upward and downward directions. The middle sections of the long sides of the two side chain plates are connected by crossbeam one and crossbeam two, respectively. Crossbeam two is an integral structure with the two side chain plates, while crossbeam one is detachably connected to the two side chain plates. This allows for quick installation or maintenance of cables, oil pipes, air pipes, water pipes, etc., without the need for threading, greatly simplifying the maintenance process. Multiple movable partitions divide the inner cavity of the cable chain, ensuring a stable movement trajectory for the cables during extension, contraction, or bending, reducing lateral swaying of the cables and lowering the risk of wear and fatigue fracture caused by disordered movement. This utility model has a compact structure and small size, making it suitable for small equipment with limited space. Furthermore, it is injection molded from engineering plastics, maintaining high rigidity to meet basic load requirements. Attached Figure Description

[0020] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0021] In the attached diagram:

[0022] Figure 1 An external view of a small, internally open S-shaped bridge cable chain provided for an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the chain link body without the crossbeam in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the crossbeam in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram showing the engagement between the claw and the tongue at one end of the crossbeam in an embodiment of this utility model.

[0026] Figure 5 This is a schematic diagram showing the fit between the chain link body and the partition in an embodiment of this utility model;

[0027] Figure 6 This is a schematic diagram of the partition structure in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of connector one in an embodiment of this utility model;

[0029] Figure 8 This is a schematic diagram of the structure of connector two in an embodiment of this utility model;

[0030] In the picture:

[0031] 1-Chain link body; 11-Chain plate; 12-Crossbeam 1; 13-Crossbeam 2; 2-Joint 1; 3-Joint 2; 4-Partition plate; 41-Upright plate; 42-Support platform; 43-C-shaped buckle; 44-Protrusion; 5-Fixed shaft; 6-Mounting groove; 7-Sleeve; 8-Protruding tongue; 9-Claw; 10-Claw head;

[0032] 14-Barb; 15-Edge; 16-Slot; 17-Shaft; 18-Positioning Hole; 19-Sunk; 20-Limiting Slot 1; 21-Limiting Block 1; 22-Sunk; 23-Limiting Block 2; 24-Limiting Block 2; 25-Slot 1; 26-Slot 2; 27-Weight Reduction Hole; 28-Weight Reduction Slot; 29-Comb Teeth. Detailed Implementation

[0033] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this utility model will be described below with reference to the accompanying drawings.

[0034] like Figure 1 , 5As shown, a small, internally open S-shaped bridge cable chain includes several chain link bodies 1 and connectors 2 and 3 at both ends. The chain link bodies 1 are rotatably connected end to end and are used to drive the cable chain to bend in both upward and downward directions. Connectors 2 and 3 are rotatably connected to the chain link bodies 1 at both ends of the cable chain. Each chain link body 1 includes two opposing and parallel chain plates 11. The middle parts of the upper and lower edges of the long sides of the chain plates 11 are connected by crossbeams 12 and 13, respectively. The two ends of crossbeam 12 are detachably connected to the chain plates 11. The crossbeam 13 is an integral structure with the chain plates 11. A movable partition 4 is provided between the crossbeams 12 and 13 to divide the inner cavity of the cable chain into multiple cavities. The two ends of the partition 4 are detachably connected to the crossbeams 1 and 2, respectively. This cable chain is compact and suitable for small equipment in space-constrained environments. The integrated structure of the crossbeam and chain plate enhances overall rigidity to meet basic load requirements. The inner crossbeam is removable, allowing for quick installation and wiring without the need for threading. It also facilitates the maintenance of cables, oil pipes, air pipes, water pipes, etc., greatly simplifying the maintenance process. The partitions divide the inner cavity of the cable chain, allowing for orderly placement of internal cables and maintaining a stable movement trajectory during cable extension, contraction, or bending, reducing lateral swaying of cables and lowering the risk of cable wear.

[0035] In specific embodiments of this utility model, such as Figure 2 and Figure 3 As shown, one end of the crossbeam 12 is rotatably connected to a fixed shaft 5 at the center of the edge of one side chain plate 11, and the other end of the crossbeam 12 is engaged with the center of the edge of the other side chain plate 11. Each side chain plate 11 has a mounting groove 6 at its center. The fixed shaft 5 is located within the mounting groove 6 in the center of one side chain plate 11, with a gap between the fixed shaft 5 and the bottom of the mounting groove 6. One end of the crossbeam 12 has a sleeve 7 that engages with the fixed shaft 5. The sleeve 7 is a semi-enclosed structure with a notch on its side wall, the notch facing outwards, and the solid part of the sleeve 7 placed within the gap between the fixed shaft 5 and the mounting groove 6. The bottom of the mounting groove 6 at the center of the edge of the other side chain plate 11 has a protruding tongue 8, and the other end of the crossbeam 12 has a claw 9 that engages with the protruding tongue 8. During installation, the sleeve at one end of the crossbeam is hooked onto the fixed shaft, and the claw at the other end is pressed onto the protruding tongue; conversely, this allows for quick disassembly of the crossbeam 12. Meanwhile, the outer surfaces of the sleeve 7 and the claw 9 are both flat and flush with the outer surface of the chain plate 11, ensuring that the drag chain has a neat and beautiful appearance.

[0036] As a preferred structure, such as Figure 2 , 4As shown, the protruding tongue 8 is located in the middle of the mounting groove 6. The protruding tongue 8 is an irregularly shaped structure with protrusions on both sides at the upper end. The inner side of the upper end of the protruding tongue 8 is an arc surface, and the outer side is a clamping head 10 that cooperates with the clamping claw 9. The clamping head 10 is a right-angled trapezoidal structure, and its top is a downward-sloping guide slope. The inner root of the clamping claw 9 is an inner arc surface that cooperates with the arc surface of the protruding tongue 8. The end of the clamping claw 9 is provided with a barb 14 for cooperating with the clamping head 10 on the outer side of the protruding tongue 8. The above structure allows the barb at the end of the clamping claw to hook the clamping head when the clamping claw and the protruding tongue are engaged, ensuring the stability of the crossbeam during the operation of the cable chain.

[0037] In the specific production process, such as Figure 3 As shown, both sides of the root of the sleeve 7 and the claw 9 are provided with protruding eaves 15. One side of the eaves 15 is in contact with the inner wall of the chain plate 11, and the other side is rounded to the two sides of the crossbeam 12. The crossbeam 12 can increase the mating surface with the chain plate by means of the eaves, thereby improving the overall strength.

[0038] like Figure 5 , 6 As shown, the partition 4 consists of several plates arranged parallel to the two side chain plates 11. Each partition 4 includes a vertical plate 41 and support platforms 42 at both ends. The support platforms 42 at both ends are respectively attached to the inner surfaces of the first crossbeam 12 and the second crossbeam 13. Each end of the support platform 42 is provided with a C-shaped buckle 43 that cooperates with the first crossbeam 12 and the second crossbeam 13. The inner center of the C-shaped buckle 43 is provided with a protrusion 44. The two sides of the first crossbeam 12 and the second crossbeam 13 are provided with several slots 16 for cooperating with the protrusions 44. In actual manufacturing, the outer edges of the slots are all rounded. The drag chain, which is injection molded from engineering plastic, can move the protrusions between multiple slots when the partition is moved left and right due to the elasticity of the engineering plastic. After the partition position is adjusted, the C-shaped buckle, with the cooperation of the inner protrusion and the slot, can reliably fix the partition between the upper and lower crossbeams.

[0039] In specific embodiments of this utility model, such as Figure 2 , 7 As shown in Figure 8, the chain plates 11 of several chain links 1 are rotatably engaged with each other through a connecting structure. The first connector 2 and the second connector 3 are rotatably engaged with the chain plates 11 at both ends of the drag chain through the connecting structure. The connecting structure includes a rotating shaft 17 and a positioning hole 18 that rotatably engages with it. The edges of both ends of the chain plate 11 and the edges of the connecting plates of the first connector 2 and the second connector 3 are all arc-shaped. The rotating shaft 17 is located on the outside of the connecting plate of the first connector 2 at one end of the chain plate 11 and at the center of the arc-shaped edge. The positioning hole 18 is located at the center of the arc-shaped edge of the connecting plate of the second connector 3 at the other end of the chain plate 11.

[0040] like Figure 2As shown, the rotating shaft 17 is located in the middle of the recessed platform 19 on the outer side of the end of the chain plate 11. The outer edge of the recessed platform 19 is provided with a fan-shaped limiting groove 20, and the upper and lower ends of the limiting groove 20 extend to the upper and lower sides of the center line of the end of the chain plate, respectively. A limiting block 21 is radially provided on the arc-shaped side wall of the recessed platform 19, and the limiting block 21 is located in the middle of the side wall of the recessed platform 19. A recessed groove 22 is provided on the inner wall of the chain plate 11 on the inner side of the positioning hole 18, and a fan-shaped limiting groove is provided on the inner side of the end edge of the recessed groove 22. The second positioning groove 23 extends to the upper and lower ends of the chain plate end centerline, respectively. The second positioning groove 23 cooperates with the first positioning block 21 at the end of the adjacent chain plate 11. The side wall of the recessed groove 22 is radially provided with a second positioning block 24 that can cooperate with the first positioning groove 20. The second positioning block 24 is located in the middle of the side wall of the recessed groove 22. The first positioning groove 20 and the second positioning groove 23 have the same curvature and their corresponding central angles are both 90°, which are used to limit the angle of bending of the drag chain to the upper and lower sides. When assembling several chain links, the recessed groove at the end of the chain plate faces the recessed platform at the end of the adjacent chain plate, so that the positioning hole is fitted on the corresponding rotating shaft, the first positioning block is placed in the second positioning groove, and the second positioning block is placed in the first positioning groove.

[0041] In the specific manufacturing process, the inner wall surfaces of the two side chain plates 11 of the adjacent chain link body 1 are flush, and the outer surfaces of the two side chain plates 11 are basically consistent with the outer surfaces of the two ends of the crossbeam 12. At the same time, the outer side of the end of the chain plate with the groove protrudes slightly from the other surfaces, and the protrusion is fan-shaped, which can improve the strength of the end of the chain plate.

[0042] As a preferred structure, such as Figure 7 , 8 As shown, the connecting plate end edge of connector 2 has two 90° included grooves 25. These grooves 25 engage with limiting block 24 and are located on the outer side of the connecting plate, with both grooves 25 facing the inner side of the cable chain bend. The connecting plate end edge of connector 3 has two 90° included grooves 26. These grooves 26 engage with limiting block 21 and are located on the inner side of the connecting plate, with both grooves 26 facing the inner side of the cable chain bend. The design of two grooves on each end connector improves versatility and adapts to cable chain installations at different angles. When assembling the two end connectors, press the end with the positioning hole onto the shaft of the adjacent chain plate, and then fit the positioning hole on the other end of the cable chain onto the shaft of connector 1. This quickly completes the connector assembly.

[0043] To further optimize the above structure, the intermediate plates of both connector 2 and connector 3 are provided with a row of comb teeth 29, with adjacent comb teeth 29 arranged side by side and parallel to the connecting plates on both sides. The comb tooth structure can limit the movement of cables and pipelines, ensuring that cables and various pipelines maintain a stable movement trajectory during the bending process of the cable chain, reducing the lateral sway of cables and pipelines, and reducing the risk of wear and fatigue fracture caused by disordered movement.

[0044] In the manufacturing of the cable chain, the chain link body 1, connector 1 2, and connector 2 3 are all injection molded from engineering plastics. The chain plate and crossbeam 2 are integrally injection molded, while crossbeam 1, partition plate, connector 1, and connector 2 are integrally injection molded. This process facilitates mass production. In the specific design, the intermediate plates of connector 1 2 and connector 2 3, as well as the partition plate 4, are provided with weight-reducing holes 27. The weight-reducing holes 27 on the partition plate 4 are located near the inner side of the cable chain bend; the outer side of the middle of the chain plate 11 is provided with a weight-reducing groove 28, which can reduce material consumption and reduce the overall weight.

[0045] In summary, this utility model has the advantages of simple and compact structure, convenient and quick loading, unloading and maintenance. Its small size makes it suitable for small equipment in space-constrained environments. The chain plate, crossbeam two, crossbeam one, partition plate, connector one, and connector two are all integrally injection molded from engineering plastics, facilitating mass production while improving rigidity to meet basic load requirements. The cable chain can be bent in both upward and downward directions, expanding its application range. Crossbeam one is detachable, enabling rapid cable chain installation and wiring, and facilitating the maintenance of cables, oil pipes, air pipes, water pipes, etc., greatly simplifying the maintenance process. Simultaneously, the comb-tooth structure on both ends of the connector and its internal partitions can limit cable movement, preventing lateral swaying during cable chain operation, thereby reducing cable wear and extending service life.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A small, internally open S-shaped bridge cable chain, characterized in that: The cable chain includes several main chain links and connectors 1 and 2 at both ends. The main chain links are rotatably connected end to end and are used to drive the cable chain to bend in both upward and downward directions. Connectors 1 and 2 are rotatably connected to the main chain links at both ends of the cable chain. Each main chain link includes two opposing and parallel chain plates. The middle parts of the upper and lower long sides of the two chain plates are connected by crossbeam 1 and crossbeam 2, respectively. The two ends of crossbeam 1 are detachably connected to the chain plates. Crossbeam 2 is an integral structure with the two chain plates. A movable partition is provided between crossbeam 1 and crossbeam 2 to divide the inner cavity of the cable chain into multiple cavities. The two ends of the partition are detachably connected to crossbeam 1 and crossbeam 2, respectively.

2. A small, internally open S-shaped bridge cable chain according to claim 1, characterized in that: One end of the crossbeam is rotatably connected to a fixed shaft in the middle of the edge of one side chain plate, and the other end of the crossbeam is engaged with the middle of the edge of the other side chain plate.

3. A small, internally open S-shaped bridge cable chain according to claim 2, characterized in that: Both sides of the chain plate have a mounting groove in the middle of the edge. The fixed shaft is set in the mounting groove in the middle of one side of the chain plate, and there is a gap between the fixed shaft and the bottom of the mounting groove. One end of the crossbeam is provided with a sleeve that cooperates with the fixed shaft. The sleeve is a semi-enclosed structure with a notch. The notch of the sleeve faces outward. The solid part of the sleeve is placed in the gap between the fixed shaft and the mounting groove. The bottom of the mounting groove in the middle of the edge of the other side of the chain plate is provided with a tongue. The other end of the crossbeam is provided with a claw that cooperates with the tongue.

4. A small, internally open S-shaped bridge cable chain according to claim 3, characterized in that: The protruding tongue is located in the middle of the mounting groove. The protruding tongue is an irregular structure with protrusions on both sides at the upper end. The inner side of the upper end of the protruding tongue is an arc surface, and the outer side is a clamping head that cooperates with the clamping claw. The clamping head is a right-angled trapezoidal structure, and its top is a downward-sloping guide surface. The inner root of the clamping claw is an inner arc surface that cooperates with the arc surface of the protruding tongue. The end of the clamping claw is provided with a barb for cooperating with the clamping head on the outer side of the protruding tongue.

5. A small, internally open S-shaped bridge cable chain according to claim 3, characterized in that: Both sides of the root of the sleeve and the claw are provided with protruding eaves. One side of the eaves is in contact with the inner wall of the chain plate, and the other side is in a rounded transition with the two sides of the crossbeam.

6. A small, internally open S-shaped bridge cable chain according to claim 1, characterized in that: The partition consists of several partitions arranged parallel to the two side chain plates. Each partition includes a vertical plate and support platforms at both ends. The support platforms at both ends are respectively attached to the inner surfaces of crossbeam one and crossbeam two. Each end of the support platform is provided with a C-shaped buckle that cooperates with crossbeam one and crossbeam two. The inner center of the C-shaped buckle is provided with a protrusion. Both sides of crossbeam one and crossbeam two are provided with several slots for cooperating with the protrusion.

7. A small, internally open S-shaped bridge cable chain according to claim 1, characterized in that: The chain plates of several chain links are rotatably engaged through a connecting structure. The first and second joints are rotatably engaged with the chain plates at both ends of the drag chain through a connecting structure. The connecting structure includes a rotating shaft and a positioning hole that rotatably engages with it. The edges of both ends of the chain plates and the edges of the connecting plates of the first and second joints are all arc-shaped. The rotating shaft is located at the center of the arc-shaped edge of one end of the chain plate and the connecting plate of the first joint; the positioning hole is located at the center of the arc-shaped edge of the connecting plate of the other end of the chain plate and the connecting plate of the second joint. The pivot is located in the middle of the recessed platform on the outer side of the chain plate end. The outer edge of the recessed platform has a fan-shaped limiting groove, with its upper and lower ends extending to the upper and lower sides of the centerline of the chain plate end, respectively. A limiting block is radially provided on the arc-shaped sidewall of the recessed platform, located in the middle of the sidewall. A recessed groove is provided on the inner wall of the chain plate inside the positioning hole. A fan-shaped limiting groove is provided on the inner side of the end edge of the recessed groove, with its upper and lower ends extending to the chain plate end, respectively. On the upper and lower sides of the center line, the second limiting groove cooperates with the first limiting block at the end of the adjacent chain plate; the side wall of the sink is radially provided with a second limiting block that can cooperate with the first limiting groove, the second limiting block is located in the middle of the side wall of the sink, and the side wall of the second limiting groove near the middle of the end of the chain plate is flush with the edge of the first limiting block towards the outer side of the drag chain; the first limiting groove and the second limiting groove have the same curvature and their corresponding central angles are both 90°, which are used to limit the angle of the drag chain bending to the upper and lower sides. The connecting plate of the first connector has two slots at a 90° angle at its end edge. The slots can cooperate with the limiting block and are located on the outside of the connecting plate. The two slots face the inside of the cable chain bend. The connecting plate of the second connector has two slots at a 90° angle at its end edge. The slots can cooperate with the limiting block and are located on the inside of the connecting plate. The two slots face the inside of the cable chain bend.

8. A small, internally open S-shaped bridge cable chain according to claim 1, characterized in that: Both the middle plates of connector one and connector two are provided with a row of comb teeth at their ends, with adjacent comb teeth arranged side by side and parallel to the connecting plates on both sides.

9. A small, internally open S-shaped bridge cable chain according to any one of claims 1-8, characterized in that: The main body of the chain link, joint one, and joint two are all made of engineering plastic injection molding.

10. A small, internally open S-shaped bridge cable chain according to claim 9, characterized in that: Weight reduction holes are provided on the intermediate plates and partitions of joint one and joint two. The weight reduction holes on the partition are located on the inner side of the drag chain bend. Weight reduction grooves are provided on the outer side of the middle part of the chain plate.

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