Light inward-opening bridge type drag chain

Abstract

The utility model discloses a light inward-opening bridge type drag chain, which belongs to the technical field of drag chains, and comprises a plurality of chain link main bodies as well as joints I and joints II at the two ends of the chain link main bodies, the chain link main bodies are rotationally connected end to end through connecting structures, and the bending angle of the drag chain is limited through limiting structures; the middles of the long edges of the chain plates on the two sides of the chain link body are connected through the first cross beam and the second cross beam respectively, the first cross beam on the outer side and the chain plates on the two sides are of an integrated structure, the second cross beam on the inner side is detachably connected, various internal pipelines can be rapidly installed or maintained without threading, and the maintenance process is greatly simplified. The adjacent chain plates are rotationally connected through the connecting structures, bending of the drag chain is facilitated, the first connector and the second connector are rotationally or fixedly connected with the chain link bodies at the two ends of the drag chain respectively, and application is flexible and convenient. The utility model has the advantages of compact structure and small volume, can be suitable for small equipment with limited space, and can keep high rigidity to meet the basic load requirement by adopting the injection molding of engineering plastics.

Description

Technical Field

[0001] This utility model belongs to the field of cable chain technology, and specifically relates to a lightweight internally open bridge type cable chain. Background Technology

[0002] Cable chains are components used to secure cables, wires, pneumatic hoses, and hydraulic lines to facilitate their rotation and movement. They are commonly used in mechanical equipment to protect various pipelines such as cables, oil pipes, and air pipes, and can meet the different movement requirements of the equipment. Currently, existing cable chains have a relatively bulky structure and large size, making the assembly and maintenance of various cables cumbersome and inconvenient, and unsuitable for applications with limited space. Utility Model Content

[0003] To address the above problems, this utility model provides a lightweight internally open bridge cable chain.

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

[0005] A lightweight, internally bridging cable chain includes several main chain links and connectors at both ends. The main chain links are rotatably connected end-to-end via a connecting structure to enable unidirectional bending of the cable chain. Connectors 1 and 2 are rotatably or fixedly connected to the main chain links at both ends of the cable chain. Each main chain link includes two relatively parallel chain plates and crossbeams 1 and 2 at the middle of its upper and lower sides. Crossbeam 1 is located on the outer side of the bent cable chain, and its two ends are fixedly connected to the chain plates on both sides as an integral structure. Crossbeam 2 is located on the inner side of the bent cable chain, and its two ends are detachably connected to the chain plates on both sides. The connecting plates of connectors 1 and 2 are connected to the chain plates at both ends of the cable chain via a connecting structure. Adjacent chain plates cooperate through a limiting structure, which limits the bending angle of the cable chain.

[0006] Furthermore, the edges of both ends of the chain plate and the connecting plates of joint one and joint two are all arc-shaped. The connecting structure includes a rotating shaft and a positioning hole that rotates with it. The rotating shaft is located on the outside of the connecting plate of one end of the chain plate and joint one, and is located at the center of the arc-shaped edge. 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 joint two.

[0007] Furthermore, the limiting structure includes a limiting block one and a limiting groove one and a limiting block two and a limiting groove two that cooperate with it; the rotating shaft is located in the middle of the recessed platform on the outer side of the chain plate end; a recessed groove is provided on the inner wall of the chain plate on the inner side of the positioning hole; the limiting block one is located in the middle of the side wall of the recessed platform and is located in the middle of the chain plate; the limiting groove one is located at the edge of the recessed groove on the inner side of the adjacent chain plate end and is an arc-shaped groove concentric with the positioning hole; the limiting block two is located on the side wall of the recessed groove and is located in the middle of the chain plate; the limiting groove two is located at the edge of the recessed platform on the outer side of the adjacent chain plate end and is an arc-shaped groove concentric with the rotating shaft;

[0008] The first limiting block can slide in an arc within the first limiting groove, and the second limiting block can slide in an arc within the second limiting groove; the first limiting groove and the second limiting groove have the same arc and their corresponding central angles are both less than 90°, which are used to limit the bending angle of the cable chain.

[0009] The sidewalls of the first and second limiting grooves near the middle of the chain plate end are parallel to the center line connecting the rotating shaft and the positioning hole. The other sidewalls of the first and second limiting grooves are both set towards the inner side of the drag chain bend.

[0010] Furthermore, the outer edge of the connecting plate end of the connector one is provided with a slot one, which can cooperate with the limiting block two on the inner side of the adjacent chain plate; the inner edge of the connecting plate end of the connector two is provided with a slot two, which can cooperate with the limiting block one on the outer side of the adjacent chain plate.

[0011] Furthermore, the outer edge of the connecting plate of the connector has two slots, and the included angle between the two slots is 90°; or, the slot is an arc-shaped groove with an angle range of -53° to 90°.

[0012] Furthermore, the connector 2 has two slots on the inner edge of the connecting plate, and the included angle of the two slots is 90°; or, the slot 2 is an arc-shaped groove with an angle range of -53° to 90°.

[0013] 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.

[0014] Furthermore, one end of the second crossbeam is rotatably connected to the middle of the edge of one side chain plate via a fixed shaft, and the other end of the second crossbeam is connected to the middle of the edge of the other side chain plate via a snap-fit ​​structure.

[0015] 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 has 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 has a protrusion. The other end of the crossbeam has a claw that cooperates with the protrusion.

[0016] Furthermore, the tongue is located in the middle of the mounting groove. The tongue is an irregularly shaped structure with protrusions on both sides at the upper end. The inner side of the upper end of the tongue is an arc surface, and the outer side is a locking head that cooperates with the locking claw. The locking head is a right-angled trapezoidal structure, and its top is a downward-sloping guide surface. The inner root of the locking claw is an inner arc surface that cooperates with the arc surface of the tongue. The end of the locking claw is provided with a barb for cooperating with the locking head on the outer side of the tongue. Both sides of the root of the sleeve and the locking 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.

[0017] Furthermore, the main body of the chain link, joint one and joint two are all injection molded from engineering plastics, and the inner cavity of the main body of the chain link is 45mm high and 50mm wide; the main body of crossbeam one and crossbeam two are both I-shaped structures with U-shaped grooves on both sides.

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

[0019] In this invention, the long sides of the chain plates on both sides of the main body of the chain link are connected by crossbeam one and crossbeam two, respectively. Crossbeam one on the outer side is an integral structure with the chain plates on both sides, while crossbeam two on the inner side 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. Adjacent chain plates are rotatably connected via a connecting structure, facilitating unidirectional bending of the cable chain, and the bending angle is limited by a limiting structure. Simultaneously, connector one and connector two are rotatably or fixedly connected to the main body of the chain links at both ends, offering flexible and convenient application. This invention 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 1An external view of a lightweight internally opened bridge-type cable chain provided for an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the link body in an embodiment of the present invention;

[0024] Figure 3 for Figure 2 View A in the middle;

[0025] Figure 4 This is a schematic diagram of the structure of the second crossbeam in this embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional schematic diagram of the engagement between the claw and the tongue of the second crossbeam in this embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of the second beam in this embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of connector one in Embodiment 1 of this utility model;

[0029] Figure 8 This is a schematic diagram of the structure of connector one in embodiment 2 of this utility model;

[0030] Figure 9 This is a schematic diagram of the structure of connector one in embodiment 3 of this utility model;

[0031] Figure 10 This is a schematic diagram of the structure of connector one in embodiment 4 of this utility model;

[0032] Figure 11 This is a schematic diagram of the structure of connector two in embodiment 5 of this utility model;

[0033] Figure 12 This is a schematic diagram of the structure of connector two in embodiment 6 of this utility model;

[0034] Figure 13 This is a schematic diagram of the structure of connector two in embodiment 7 of this utility model;

[0035] Figure 14 This is a schematic diagram of the structure of connector two in embodiment 8 of this utility model;

[0036] In the picture:

[0037] 1-Chain link body; 11-Chain plate; 12-Crossbeam 1; 13-Crossbeam 2; 131-Sleeve; 132-Claw; 2-Joint 1; 3-Joint 2; 4-Shaft; 5-Positioning hole; 6-Limit block 1; 7-Limit groove 1; 8-Limit block 2; 9-Limit groove 2; 10-Sunk; 14-Sunk groove; 15-Claw groove 1; 16-Claw groove 2; 17-Comb teeth; 18-Fixed shaft; 19-Mounting groove; 20-Protruding tongue; 21-Claw head; 22-Barb; 23-Eaves. Detailed Implementation

[0038] 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.

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, a lightweight internally bridging 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 through a connecting structure to enable unidirectional bending of the cable chain. Connectors 2 and 3 are rotatably or fixedly connected to the chain link bodies 1 at both ends of the cable chain. Each chain link body 1 includes two relatively parallel chain plates 11 and crossbeams 12 and 13 at the middle of its upper and lower sides. The crossbeam 12 is located on the outer side of the bent cable chain, and its two ends are fixedly connected to the chain plates 11 on both sides as an integral structure. The crossbeam 13 is located on the inner side of the bent cable chain, and its two ends are detachably connected to the chain plates 11 on both sides. The connecting plates of connectors 2 and 3 are connected to the chain plates 11 at both ends of the cable chain through a connecting structure. Adjacent chain plates 11 are engaged by a limiting structure, which is used to limit the bending angle of the cable chain. The outer crossbeam of the cable chain, when bent, is integrated with the chain plate, which improves rigidity to meet the load requirements of the foundation. The inner, detachable crossbeam allows for quick installation and wiring, while also facilitating the maintenance of cables, oil pipes, air pipes, water pipes, etc., greatly simplifying the maintenance process. This cable chain has a compact structure and small size, making it suitable for use in small equipment where space is limited.

[0040] In specific embodiments of this utility model, such as Figure 2 , 7As shown in Figure -14, the edges of both ends of the chain plate 11 and the connecting plates of joint 1 and joint 2 are all arc-shaped. The connecting structure includes a rotating shaft 4 and a positioning hole 5 that rotatably engages with it. The rotating shaft 4 is located on the outside of the connecting plate of one end of the chain plate 11 and joint 2, and at the center of the arc-shaped edge. The positioning hole 5 is located at the center of the arc-shaped edge of the connecting plate of the other end of the chain plate 11 and joint 2. This structure allows for relative rotation of adjacent chain links and adjustment of the installation position of the chain link body relative to joint 1 and joint 2.

[0041] As a preferred structure, such as Figure 2 , 3 As shown, the limiting structure includes a limiting block 6 and a limiting groove 7 and a limiting block 8 and a limiting groove 9 that cooperate with it; the rotating shaft 4 is located in the middle of the recessed platform 10 on the outer side of the end of the chain plate 11; a recessed groove 14 is provided on the inner wall of the chain plate 11 on the inner side of the positioning hole 5; the limiting block 6 is located in the middle of the side wall of the recessed platform 10 and is located in the middle of the chain plate 11; the limiting groove 7 is located on the edge of the recessed groove 14 on the inner side of the end of the adjacent chain plate 11 and is an arc-shaped groove concentric with the positioning hole 5; the limiting block 8 is located on the side wall of the recessed groove 14 and is located in the middle of the chain plate 11; the limiting groove 9 is located on the edge of the recessed platform 10 on the outer side of the end of the adjacent chain plate 11 and is an arc-shaped groove concentric with the rotating shaft 4. During assembly, the chain link body is positioned so that the countersunk groove at the end of the chain plate faces the countersunk platform at the end of the adjacent chain plate, and the positioning hole is fitted onto the corresponding rotating shaft. Limiting block one is placed in limiting groove one, and limiting block two is placed in limiting groove two, allowing adjacent chain plates to rotate within a defined angle. This ensures that the outer surface of the cable chain is roughly flush, resulting in a neat and aesthetically pleasing appearance; and that the inner wall surfaces of adjacent chain plates are flush after mating to avoid interference with pipelines.

[0042] During the bending process of the cable chain, the first limiting block 6 can slide in an arc within the first limiting groove 7, and the second limiting block 8 can slide in an arc within the second limiting groove 9; the first limiting groove 7 and the second limiting groove 9 have the same curvature, and their corresponding central angles are both less than 90°, which are used to limit the bending angle of the cable chain; the sidewalls of the first limiting groove 7 and the second limiting groove 9 near the middle of the end of the chain plate 11 are parallel to the center line connecting the pivot 4 and the positioning hole 5, and the other sidewalls of the first limiting groove 7 and the second limiting groove 9 are both set towards the inner side of the cable chain bending.

[0043] In actual manufacturing, the first limiting block 6 is rectangular, and the second limiting block 8 is U-shaped, which can save manufacturing materials and reduce the weight of the chain plate.

[0044] In specific design, such as Figure 7-14As shown, the outer edge of the connecting plate end of connector 12 is provided with a slot 15, which can cooperate with the limiting block 2 8 on the inner side of the adjacent chain plate 11; the inner edge of the connecting plate end of connector 23 is provided with a slot 2 16, which can cooperate with the limiting block 6 on the outer side of the adjacent chain plate 11. Connector 1 and connector 2 respectively use slot 1 and slot 2 to restrict the installation position, and different specifications of connectors can be made for different installation position requirements, making them flexible and convenient to use. At the same time, the connecting plate end of connector 1 is also provided with a circular countersunk platform, and the inner side of the connecting plate end of connector 2 is provided with a circular countersunk groove, which facilitates cooperation with the end of the adjacent chain plate.

[0045] like Figure 7 , 8 In embodiments 1 and 2 shown, the connector 2 has two slots 15 on the outer edge of its connecting plate, and the included angle between the two slots 15 is 90°, which allows the connector to be fixed in two mutually perpendicular positions. Figure 9 In the illustrated embodiment 3, the slot 15 is an arc-shaped groove with an angle range of 0 to 90°, and the connector 1 can rotate within the range of 0 to 90°. Figure 10 In Embodiment 4, the slot 15 is an arc-shaped groove with an angle range of -53° to 90°, allowing the connector to rotate within this range. In Embodiments 2-4, the end of the middle plate of the connector has a row of comb teeth 17, with adjacent comb teeth 17 arranged side-by-side and parallel to the connecting plates on both sides. These comb teeth help to limit the movement of various pipelines, preventing mutual wear caused by disordered pipeline arrangement during cable chain operation.

[0046] like Figure 11 , 12 In embodiments 5 and 6, the inner edge of the connecting plate of the second connector 3 has two slots 16, and the included angle between the two slots 16 is 90°, which enables the second connector to be fixed in two mutually perpendicular positions. Figure 13 In the illustrated embodiment 7, the second slot 16 is an arc-shaped groove with an angle range of 0 to 90°, allowing the second connector to rotate within this range. Figure 14 In Embodiment 8, the second slot 16 is an arc-shaped groove with an angle range of -53° to 90°, allowing the second connector to rotate within this range. In Embodiments 6-8, the end of the middle plate of the second connector 3 is provided with a row of comb teeth 17, with adjacent comb teeth 17 arranged side-by-side and parallel to the connecting plates on both sides. These comb teeth can limit the movement of various pipelines, preventing mutual wear caused by disordered pipeline arrangement during cable chain operation.

[0047] In specific embodiments of this utility model, such as Figure 3 , 5As shown in Figure 6, one end of the second crossbeam 13 is rotatably connected to the middle edge of one side chain plate 11 via a fixed shaft 18, and the other end of the second crossbeam 13 is connected to the middle edge of the other side chain plate 11 via a snap-fit ​​structure; both sides of the chain plate 11 have mounting grooves 19 in the middle of their edges, and the fixed shaft 18 is located in the mounting groove 19 in the middle of one side chain plate 11, with a gap between the fixed shaft 18 and the bottom of the mounting groove 19; one end of the second crossbeam 13 is provided with a sleeve that mates with the fixed shaft 18. 131, the sleeve 131 is a semi-enclosed structure with a notch, the notch of the sleeve 131 facing outwards, and the solid part of the sleeve 131 is placed in the gap between the fixed shaft 18 and the mounting groove 19; the bottom of the mounting groove 19 in the middle of the edge of the other side chain plate 11 is provided with a protruding tongue 20, and the other end of the crossbeam 13 is provided with a claw 132 that cooperates with the protruding tongue 20; the outer surfaces of the claws 132 are all flat and flush with the outer surfaces of the chain plate 11, which makes the drag chain look neat and beautiful. During installation, the sleeve at the end of the crossbeam 13 is hooked onto the fixed shaft, and then the claw at the other end is pressed and locked onto the protruding tongue; the reverse operation can realize the quick disassembly of the crossbeam 13.

[0048] In specific design, such as Figure 5 As shown, the tongue 20 is located in the middle of the mounting groove 19. The tongue 20 is an irregular structure with protrusions on both sides at the upper end. The inner side of the upper end of the tongue 20 is an arc surface, and the outer side is a locking head 21 that cooperates with the locking claw 132. The locking head 21 is a right-angled trapezoidal structure, and its top is a downward-sloping guide surface. The inner root of the locking claw 132 is an inner arc surface that cooperates with the arc surface of the tongue 20. The end of the locking claw 132 is provided with a barb 22 for cooperating with the locking head 21 on the outer side of the tongue 20. The sleeve 131 and the locking claw 132 are provided with protruding edge 23 on both sides of the root. One side of the edge 23 is in contact with the inner wall of the chain plate 11, and the other side is in a rounded transition with the two sides of the crossbeam 13. The edge can increase the mating surface between the crossbeam and the chain plate and improve the overall strength. When installing the second crossbeam, press the claw to engage it with the tongue, so that the barb at the end of the claw hooks the head, ensuring that the second crossbeam is securely assembled and preventing it from detaching from the tongue due to vibration during the operation of the cable chain.

[0049] In the manufacturing process of the cable chain, the main body 1 of the chain link, joint 2, and joint 3 are all injection molded from engineering plastics, a process that facilitates mass production. The main bodies of crossbeams 12 and 13 are both I-shaped structures with U-shaped grooves on both sides. This structure saves material during manufacturing while increasing rigidity to meet the load requirements of the foundation. The inner cavity of the main body 1 of the chain link has a height of 45mm and a width of 50mm. Cable chains with these dimensions are compact, occupy little space, and are suitable for use in space-constrained machinery.

[0050] 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 lightweight internally opened bridge-type cable chain, characterized in that: The cable chain comprises several main chain links and connectors 1 and 2 at both ends. The main chain links are rotatably connected end-to-end via a connecting structure to enable unidirectional bending of the cable chain. Connectors 1 and 2 are rotatably or fixedly connected to the main chain links at both ends of the cable chain, respectively. Each main chain link includes two relatively parallel chain plates and crossbeams 1 and 2 at the middle of its upper and lower sides. Crossbeam 1 is located on the outer side of the bent cable chain, and its two ends are fixedly connected to the chain plates on both sides as an integral structure. Crossbeam 2 is located on the inner side of the bent cable chain, and its two ends are detachably connected to the chain plates on both sides. The connecting plates of connectors 1 and 2 are connected to the chain plates at both ends of the cable chain via a connecting structure. Adjacent chain plates cooperate through a limiting structure, which is used to limit the bending angle of the cable chain.

2. The lightweight internally opened bridge-type cable chain according to claim 1, characterized in that: The edges of both ends of the chain plate and the edges of the connecting plates of joint one and joint two are all arc-shaped. The connecting structure includes a rotating shaft and a positioning hole that rotates with it. The rotating shaft is located on the outside of the connecting plate of one end of the chain plate and joint one, and is located at the center of the arc-shaped edge. 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 joint two.

3. A lightweight internally opened bridge-type cable chain according to claim 2, characterized in that: The limiting structure includes a limiting block 1 and a corresponding limiting groove 1, a limiting block 2 and a corresponding limiting groove 2; the rotating shaft is located in the middle of the recessed platform on the outer side of the chain plate end; a recessed groove is provided on the inner wall of the chain plate on the inner side of the positioning hole; the limiting block 1 is located in the middle of the side wall of the recessed platform and is in the middle position of the chain plate; the limiting groove 1 is located at the edge of the recessed groove on the inner side of the adjacent chain plate end and is an arc-shaped groove concentric with the positioning hole; the limiting block 2 is located on the side wall of the recessed groove and is in the middle position of the chain plate; the limiting groove 2 is located at the edge of the recessed platform on the outer side of the adjacent chain plate end and is an arc-shaped groove concentric with the rotating shaft; The first limiting block can slide in an arc within the first limiting groove, and the second limiting block can slide in an arc within the second limiting groove; the first limiting groove and the second limiting groove have the same arc and their corresponding central angles are both less than 90°, which are used to limit the bending angle of the cable chain. The sidewalls of the first and second limiting grooves near the middle of the chain plate end are parallel to the center line connecting the rotating shaft and the positioning hole. The other sidewalls of the first and second limiting grooves are both set towards the inner side of the drag chain bend.

4. A lightweight internally opened bridge-type cable chain according to claim 3, characterized in that: The outer edge of the connecting plate end of the first connector is provided with a slot 1, which can cooperate with the limiting block 2 on the inner side of the adjacent chain plate; the inner edge of the connecting plate end of the second connector is provided with a slot 2, which can cooperate with the limiting block 1 on the outer side of the adjacent chain plate.

5. A lightweight internally opened bridge-type cable chain according to claim 4, characterized in that: The connector has two slots on the outer edge of the connecting plate, and the included angle between the two slots is 90°; or, the slot is an arc-shaped groove with an angle range of -53° to 90°.

6. A lightweight internally opened bridge-type cable chain according to claim 4, characterized in that: The connector 2 has two slots on the inner edge of the connecting plate, and the included angle of the two slots is 90°; or, the slot 2 is an arc-shaped groove with an angle range of -53° to 90°.

7. A lightweight internally opened bridge-type cable chain according to claim 4, 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.

8. A lightweight internally opened bridge-type cable chain according to claim 1, characterized in that: One end of the second crossbeam is rotatably connected to the middle of the edge of one side chain plate via a fixed shaft, and the other end of the second crossbeam is connected to the middle of the edge of the other side chain plate via a snap-fit ​​structure. 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 has 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 has a protrusion. The other end of the crossbeam has a claw that cooperates with the protrusion.

9. A lightweight internally opened bridge-type cable chain according to claim 8, characterized in that: The tongue is located in the middle of the mounting groove. The tongue is an irregularly shaped structure with protrusions on both sides at the upper end. The inner side of the upper end of the tongue is an arc surface, and the outer side is a locking head that cooperates with the locking claw. The locking head is a right-angled trapezoidal structure, and its top is a downward-sloping guide surface. The inner root of the locking claw is an inner arc surface that cooperates with the arc surface of the tongue. The end of the locking claw is provided with a barb for cooperating with the locking head on the outer side of the tongue. Both sides of the root of the sleeve and the locking claw are provided with protruding edges. One side of the edge 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.

10. A lightweight internally opened bridge-type cable chain according to any one of claims 1-9, characterized in that: The main body of the chain link, joint one and joint two are all made of engineering plastic injection molding, and the inner cavity of the main body of the chain link is 45mm high and 50mm wide; the main body of crossbeam one and crossbeam two are both I-shaped structures with U-shaped grooves on both sides.

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