Small drag chain with open bridge on outer side

Abstract

The utility model discloses a small outer side open bridge type drag chain, which belongs to the technical field of drag chains, and comprises a plurality of chain link main bodies, joints I and joints II at two ends, and the adjacent chain link main bodies are rotationally connected with each other and are rotationally connected with the joints I and the joints II; the chain link main body comprises two chain plates, the upper and lower middle parts of the chain plates are connected through a cross beam I and a cross beam II, the cross beam II corresponding to the inner side of the bent drag chain is integrated with the chain plates, the cross beam I corresponding to the outer side is detachably connected, cables, oil pipes, air pipes, water pipes and the like can be quickly mounted or maintained without threading, and the maintenance process is greatly simplified; the inner cavity of the drag chain is separated through the movable partition plates, the cable is helped to keep a stable movement track in the stretching or bending process of the drag chain, transverse swing of the cable is reduced, and the abrasion and fatigue fracture risks caused by disordered movement are reduced. The three-phase asynchronous motor is compact in structure, small in size, suitable for small equipment with limited space, high in overall rigidity and capable of meeting 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 externally open bridge type 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, and are cumbersome to install, disassemble, and maintain, making them unsuitable for applications with limited space. Moreover, the disordered arrangement of cables inside the cable chain can lead to mutual wear and fatigue breakage of the cables during long-term movement. Utility Model Content

[0003] To address the above problems, this utility model provides a small, externally open-bridge cable chain.

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

[0005] A small, externally open-bridge 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. 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 part of the long side of the two chain plates is connected by crossbeam 1 and crossbeam 2, respectively. The outer side of the curved cable chain corresponds to crossbeam 1, and the inner side corresponds to crossbeam 2. Crossbeam 2 is an integral structure with the two chain plates. One end of crossbeam 1 is rotatably connected to one chain plate, and the other end is snapped to the other chain plate. Multiple movable partitions are provided between crossbeam 1 and crossbeam 2. The two ends of the partitions are snapped to crossbeam 1 and crossbeam 2, respectively, to divide the inner cavity of the cable chain into multiple cavities.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] 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 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.

[0010] Furthermore, the snap-fit ​​structure includes a protrusion and a corresponding slot. The protrusion is located in the middle of the inner side of the C-shaped buckle, and the slot is located on both sides of the first and second crossbeams. The slots are arranged in a row on both sides of the first and second crossbeams.

[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 is provided with a fan-shaped limiting groove, and the limiting groove is close to the inner side of the drag chain bend. A limiting block is radially provided on the arc-shaped side wall of the recessed platform. The limiting block is located in the middle of the side wall of the recessed platform. The side wall of the limiting groove near the middle of the chain plate end can be flush with the edge of the limiting block facing the outer side of the drag chain bend.

[0014] A groove is provided on the inner wall of the chain plate inside the positioning hole. A fan-shaped limiting groove 2 is provided on the inner side of the end edge of the groove, and the limiting groove 2 is close to the inner side of the cable chain bend. The limiting groove 2 cooperates with the limiting block 1 at the end of the adjacent chain plate. A limiting block 2 that can cooperate with the limiting groove 1 is provided radially on the side wall of the groove. The limiting block 2 is located in the middle of the side wall of the groove. The side wall of the limiting groove 2 near the middle of the end of the chain plate can be flush with the edge of the limiting block 1 facing the outer side of the cable chain bend. The limiting groove 1 and the limiting groove 2 have the same curvature and their corresponding central angles are both 90°, which are used to limit the bending angle of the cable chain.

[0015] 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.

[0016] 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.

[0017] Furthermore, the main body of the chain link, joint one, and joint two are all injection molded from engineering plastics.

[0018] 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.

[0019] The technological advancements achieved by this invention compared to existing technologies are as follows:

[0020] In this invention, the long sides of the chain plates on both sides of the main chain link are connected by crossbeam one and crossbeam two, respectively. The inner crossbeam two is an integral structure with the two side chain plates, while the outer crossbeam one is detachable. 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 partitions between crossbeam one and crossbeam two divide the inner cavity of the chain, ensuring a stable movement trajectory for the cable during extension, contraction, or bending, reducing lateral swaying and minimizing the risk of wear and fatigue fracture caused by disordered cable movement. This invention features a compact structure and small size, making it suitable for small equipment with limited space. Furthermore, the use of engineering plastic injection molding improves overall rigidity to meet basic load requirements. Attached Figure Description

[0021] 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.

[0022] In the attached diagram:

[0023] Figure 1 An external view of a small externally open-bridge cable chain provided for an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the chain link body without the crossbeam in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the crossbeam in an embodiment of this utility model;

[0026] 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.

[0027] 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;

[0028] Figure 6 This is a schematic diagram of the partition structure in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of connector one in an embodiment of this utility model;

[0030] Figure 8 This is a schematic diagram of the structure of connector two in an embodiment of this utility model;

[0031] In the picture:

[0032] 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;

[0033] 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

[0034] 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.

[0035] like Figure 1 , 5 As shown, this utility model embodiment provides a small externally open-bridge cable chain. The cable chain includes several chain link bodies 12 and connectors 2 and 3 at both ends. The chain link bodies 1 are connected end to end in a rotatable manner, which can drive the cable chain to bend in one direction. The connectors 2 and 3 are respectively rotatably connected to the chain link bodies 1 at both ends of the cable chain. The chain link body 1 includes two opposing and parallel chain plates 11. The middle part of the long side of the two chain plates 11 is connected by crossbeams 12 and 13 respectively. The curved cable chain has a crossbeam 12 on the outer side and a crossbeam 2 13 on the inner side. The crossbeam 2 13 is an integral structure with the two side chain plates 11. One end of the crossbeam 12 is rotatably connected to one side chain plate 11, and the other end is snap-fitted to the other side chain plate 11. Multiple movable partitions 4 are provided between the crossbeam 12 and the crossbeam 2 13. The two ends of the partitions 4 are snap-fitted to the crossbeam 12 and the crossbeam 2 13 respectively, which are used to divide the inner cavity of the cable chain into multiple cavities. This cable chain has a compact structure and small size, making it suitable for small equipment with limited space. The outer crossbeam 1 can be disassembled after the cable chain is bent, allowing for quick installation and wiring without threading, while also facilitating the maintenance of cables and various pipelines, simplifying the maintenance process. The partitions divide the inner cavity of the cable chain, allowing the internal cables to be arranged in an orderly manner and maintaining a stable movement trajectory during the extension or bending of the cable chain, reducing the lateral swing of the cables and lowering the risk of cable wear.

[0036] In specific embodiments of this utility model, such as Figure 2 and Figure 3 As shown, each of the two side chain plates 11 has a mounting groove 6 in the middle of its edge. The fixed shaft 5 is located in the mounting groove 6 in the middle of one side chain plate 11, and there is 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 mates with the fixed shaft 5. The sleeve 7 is a semi-enclosed structure with a notch on its side wall, and the notch of the sleeve 7 faces outward. The solid part of the sleeve 7 is placed in the gap between the fixed shaft 5 and the mounting groove 6. The bottom of the mounting groove 6 in the middle 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 mates with the protruding tongue 8. During installation, the sleeve at one end of the crossbeam is hooked onto the fixed shaft, and then the claw at the other end is pressed and locked onto the protruding tongue. Conversely, the crossbeam 12 can be quickly disassembled. At the same time, the outer surfaces of the sleeve 7 and the claw 9 are both flat and flush with the outer surfaces of the chain plate 11, ensuring a neat and beautiful appearance of the cable chain.

[0037] 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.

[0038] 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.

[0039] In a specific embodiment of this utility model, there are two partitions 4, such as... Figure 5 , 6 As shown, the 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 snap-fit ​​structure includes a protrusion 44 and a corresponding slot 16. The protrusion 44 is located in the middle of the inner side of the C-shaped buckle 43, and the slot 16 is located on both sides of the first crossbeam 12 and the second crossbeam 13. Several slots 16 are arranged in a row on both sides of the first crossbeam 12 and the second crossbeam 13. In actual manufacturing, the outer edges of the slots are all rounded. The drag chain, which is injection molded from engineering plastic, can move between multiple slots when the partition is moved left and right due to the elasticity of the engineering plastic. After the position of the partition is adjusted, the partition can be reliably fixed between the upper and lower crossbeams by means of the cooperation between the protrusion and the slot.

[0040] 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.

[0041] like Figure 2 As shown, the pivot 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 limiting groove 20 is close to the inner side of the drag chain bend. A limiting block 21 is radially provided on the arc-shaped side wall of the recessed platform 19. The limiting block 21 is located in the middle of the side wall of the recessed platform 19. The side wall of the limiting groove 20 near the middle of the end of the chain plate 11 can be flush with the edge of the limiting block 21 facing the outer side of the drag chain bend. A recessed groove 22 is provided on the inner wall of the chain plate 11 inside the positioning hole 18. The inner side of the end edge of the recessed groove 22 is provided with a fan-shaped groove. The limiting groove 23 is located near the inner side of the drag chain bend, and it engages with the limiting block 21 at the end of the adjacent chain plate 11. The side wall of the recessed groove 22 is radially provided with a limiting block 24 that engages with the limiting groove 20. The limiting block 24 is located in the middle of the side wall of the recessed groove 22. The side wall of the limiting groove 23 near the middle of the end of the chain plate 11 is flush with the edge of the limiting block 21 facing the outer side of the drag chain bend. The limiting grooves 20 and 23 have the same curvature and their corresponding central angles are both 90°, used to limit the bending angle of the drag chain. During assembly, the recessed grooves at the ends of the chain plates face the recessed platforms at the ends of the adjacent chain plates, so that the positioning holes are fitted onto the corresponding rotating shafts. The limiting block 1 is placed in the limiting groove 2, and the limiting block 2 is placed in the limiting groove 1.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In summary, this utility model has the advantages of simple and compact structure, convenient and quick loading, unloading and maintenance. It is small in size and can be applied to small equipment with limited space. The chain plate, crossbeam 2, crossbeam 1, partition plate, connector 1 and connector 2 are all integrally injection molded using engineering plastics, which facilitates mass production and improves rigidity to meet the basic load requirements. The inner crossbeam 1 can be disassembled after the cable chain is bent, and can be quickly installed in the cable chain for wiring without threading. It also facilitates the maintenance of cables, oil pipes, air pipes, water pipes, etc., greatly simplifying the maintenance process. At the same time, the comb tooth structure on both ends of the connector and the internal partition plate can limit the cable, prevent the cable from swinging laterally during the operation of the cable chain, thereby reducing cable wear and improving service life.

[0047] 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, externally open-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 one direction. 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 part of the long side of the two chain plates is connected by crossbeam 1 and crossbeam 2, respectively. The outer side of the bent cable chain corresponds to crossbeam 1, and the inner side corresponds to crossbeam 2. Crossbeam 2 and the two chain plates are an integral structure. One end of crossbeam 1 is rotatably connected to one chain plate, and the other end is snapped to the other chain plate. Multiple movable partitions are provided between crossbeam 1 and crossbeam 2. The two ends of the partitions are snapped to crossbeam 1 and crossbeam 2, respectively, to divide the inner cavity of the cable chain into multiple cavities.

2. A small externally open-bridge cable chain according to claim 1, 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.

3. A small externally open-bridge cable chain according to claim 2, 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.

4. A small externally open-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.

5. A small externally bridging cable chain according to claim 1, characterized in that: The partition consists of several plates 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.

6. A small externally open-bridge cable chain according to claim 1, characterized in that: The snap-fit ​​structure includes a protrusion and a corresponding slot. The protrusion is located in the middle of the inner side of the C-shaped buckle, and the slot is located on both sides of the first and second crossbeams. The slots are arranged in a row on both sides of the first and second crossbeams.

7. A small externally open-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 is provided with a fan-shaped limiting groove, and the limiting groove is close to the inner side of the drag chain bend. A limiting block is radially provided on the arc-shaped side wall of the recessed platform. The limiting block is located in the middle of the side wall of the recessed platform. The side wall of the limiting groove near the middle of the chain plate end can be flush with the edge of the limiting block facing the outer side of the drag chain bend. A groove is provided on the inner wall of the chain plate inside the positioning hole. A fan-shaped limiting groove 2 is provided on the inner side of the end edge of the groove, and the limiting groove 2 is close to the inner side of the cable chain bend. The limiting groove 2 cooperates with the limiting block 1 at the end of the adjacent chain plate. A limiting block 2 that can cooperate with the limiting groove 1 is provided radially on the side wall of the groove. The limiting block 2 is located in the middle of the side wall of the groove. The side wall of the limiting groove 2 near the middle of the end of the chain plate can be flush with the edge of the limiting block 1 facing the outer side of the cable chain bend. The limiting groove 1 and the limiting groove 2 have the same curvature and their corresponding central angles are both 90°, which are used to limit the bending angle of the cable chain. 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 externally bridging 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 externally bridging 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 externally open-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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