straight pendant

Abstract

The application relates to a straight pendant, a hanger and a method for connecting and fixing two adjacent transverse force bearing cables; the hanger is provided with connecting arms on both sides, the hanger is provided with a positioning plate extending along the direction away from the gravity direction, a clamping arm is rotatably installed at the end of the connecting arm away from the positioning plate and located on the side of the connecting arm away from the gravity direction; the two side outer walls of the positioning plate towards the clamping arm are provided with first arc-shaped parts, and the side outer wall of the clamping arm towards the positioning plate is provided with a second arc-shaped part; the distance between the two first arc-shaped parts in the horizontal direction gradually decreases along the gravity direction; the second arc-shaped part gradually shrinks away from the positioning plate along the direction away from the connecting arm. The advantages and positive effects of the boltless straight pendant of the soft cross span of the electrified railway contact network are remarkable, the bolt connection structure is omitted, the problems of traditional bolts, such as vibration loosening, corrosion failure and the like, are fundamentally avoided, the risk of pantograph and catenary failure is greatly reduced, and the stability and safety of the operation of the contact network are improved.

Description

Technical Field

[0001] This application relates to the field of power engineering technology, and in particular to a straight drop wire. Background Technology

[0002] In the overhead contact system of electrified railways, the flexible cross-span straight dropper is a key component for suspending the contact wire and ensuring stable current collection by the pantograph. Traditional straight droppers mostly use bolted connections, which have obvious defects in long-term operation: train vibration can easily cause bolts to loosen, leading to abnormal contact wire height and increasing the risk of pantograph-catenary failure; bolts are prone to corrosion in complex environments, weakening connection strength and shortening service life; and installation requires strict control of tightening torque, and maintenance requires regular inspections, consuming a lot of manpower. As railways develop towards high speed and heavy load, traditional bolted structures can no longer meet performance requirements. Developing boltless straight droppers has become an inevitable trend to improve the reliability of the overhead contact system and adapt to the needs of railway modernization.

[0003] In related technologies, bolts are used to fix the straight droppers. However, traditional bolted droppers have a series of problems, such as bolt loosening, bolt rusting, and difficulty in installation and maintenance. Traditional overhead contact line clamps for the straight droppers are tightened with bolts, but the overhead contact line vibrates due to locomotive operation, causing the bolted clamps to loosen easily, which can lead to overhead contact line failures. Utility Model Content

[0004] Therefore, it is necessary to address a series of problems existing in the current traditional bolted connection of droppers, such as bolt loosening, bolt rusting, and difficulty in installation and maintenance. In addition, the traditional contact wire clamps for the soft cross-section straight droppers are clamped by bolts, but the contact wire can easily loosen due to the vibration generated by the locomotive running, which in turn leads to contact wire failure. Therefore, a straight dropper is needed.

[0005] According to one aspect of this application, a straight dropper is provided for a flexible cross-span of a railway contact network, comprising: two transverse load-bearing cables; a hanger for connecting and fixing the two adjacent transverse load-bearing cables; wherein, connecting arms are provided on both sides of the hanger, and a positioning plate extending along the direction away from gravity is provided on the hanger; a clamping arm is rotatably mounted on the end of the connecting arm away from the positioning plate and is located on the side of the connecting arm away from gravity; the positioning plate is located between the two clamping arms, and the transverse load-bearing cables are located between the clamping arms and the connecting arms; a first arcuate portion is provided on the outer wall of the positioning plate facing the clamping arms on both sides, and a second arcuate portion is provided on the outer wall of the clamping arms facing the positioning plate on one side; the horizontal distance between the first arcuate portions on both sides gradually decreases along the direction of gravity; the second arcuate portion protrudes in a direction away from the center of the clamping arm.

[0006] In one embodiment, a first clamping groove is formed on the outer wall of the connecting arm on the side opposite to the direction of gravity, and a second clamping groove is formed on the outer wall of the clamping arm on the side facing the first clamping groove, and the transverse load-bearing cable is located between the groove wall of the first clamping groove and the groove wall of the second clamping groove.

[0007] In one embodiment, both the inner walls of the first clamping groove and the second clamping groove are provided with protrusions.

[0008] In one embodiment, a swing shaft is provided at the end of the connecting arm away from the positioning plate, and a swing seat is provided on the clamping arm. The clamping arm is rotatably mounted on the swing shaft via the swing seat.

[0009] In one embodiment, the straight suspension cable includes a positioning block, and the second arc-shaped portion has a telescopic cavity.

[0010] Part of the positioning block is located inside the telescopic cavity, and part of the positioning block is located between the first arc-shaped portion and the second arc-shaped portion. The clamping arm is fixed to the first arc-shaped portion by the positioning block.

[0011] In one embodiment, the telescopic cavity includes a telescopic inner cavity and a telescopic outer cavity. The telescopic outer cavity is located near the opening of the telescopic cavity. A fixed boss is provided on the inner wall of the telescopic outer cavity, and the fixed boss protrudes from the side wall of the telescopic inner cavity. A sliding arm is fixedly provided on the outer wall of the positioning block facing the bottom wall of the telescopic inner cavity. The sliding arm is movably disposed within the telescopic cavity. A limiting boss is provided on the outer wall of the sliding arm facing the bottom wall of the telescopic inner cavity.

[0012] In one embodiment, the straight suspension string includes a return spring, one end of which is connected to the bottom wall of the telescopic inner cavity, and the other end of which is connected to the limiting boss.

[0013] In one embodiment, a first locking tooth is provided on the outer wall of the first arc-shaped portion, and a second locking tooth is provided on the outer wall of the positioning block.

[0014] In one embodiment, the hanger is further provided with a sling ring, and the sling ring is located on the side of the hanger facing the direction of gravity.

[0015] In one embodiment, a handle is also provided on the outer wall of the positioning block.

[0016] This application has the following beneficial effects:

[0017] Compared with existing technologies, this device offers significant advantages and positive effects for electrified railway catenary systems, featuring a boltless, straight dropper cable with a flexible cross-span. This structure eliminates bolted connections, fundamentally avoiding problems such as loosening due to vibration and corrosion, thus greatly reducing the risk of pantograph-catenary failure and improving the stability and safety of the catenary operation. Furthermore, this device eliminates the need for controlled tightening torque during installation, employing simplified interlocking and snap-fit ​​methods for rapid assembly, reducing human error and eliminating the need for regular bolt tightness checks, significantly lowering installation and maintenance costs.

[0018] The structural design of this device is better suited to the dynamic operating environment of high-speed and heavy-haul railways, which can reduce component wear, extend service life, and some components can be produced using common molds, further improving economic efficiency and providing strong support for the efficient and reliable operation of electrified railway catenary. Attached Figure Description

[0019] Figure 1 The overall three-dimensional structure of an embodiment of this application Figure 1 .

[0020] Figure 2 The overall three-dimensional structure of an embodiment of this application Figure 2 .

[0021] Figure 3 This is a cross-sectional view of the clamping arm in one embodiment of this application.

[0022] Figure 4 This is an embodiment of the present application. Figure 3 Enlarged view of the structure at point A in the middle.

[0023] Figure 5 This is an exploded view of an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Lateral load-bearing cable; 2. Hanger; 3. Connecting arm; 4. First clamping groove; 5. Lifting cable ring; 6. Clamping arm; 7. Swing shaft; 8. Swing seat; 9. Second clamping groove; 10. Protrusion; 11. Positioning plate; 12. First arc-shaped part; 13. Second arc-shaped part; 14. Telescopic cavity; 1401. Telescopic inner cavity; 1402. Telescopic outer cavity; 1403. Fixed boss; 15. Positioning block; 16. Sliding arm; 17. Return spring; 18. Limiting boss; 19. Second locking tooth; 20. First locking tooth. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] See Figure 1 -Appendix Figure 5 , Figure 1 A schematic diagram of the overall structure of a straight drop cable according to an embodiment of this application is shown. This cable is used for a flexible cross-span of a railway contact network and includes two transverse load-bearing cables 1 and a hanger 2 for connecting and fixing two adjacent transverse load-bearing cables 1. Each side of the hanger 2 has a connecting arm 3. A positioning plate 11 extending away from the direction of gravity is provided on the hanger 2. A clamping arm 6 is rotatably mounted on the end of the connecting arm 3 away from the positioning plate 11, located on the side of the connecting arm 3 away from the direction of gravity. The positioning plate 11 is located between the two clamping arms 6, and the transverse load-bearing cables are located between the clamping arms 6 and the connecting arm 3. First arc-shaped portions 12 are provided on the outer walls of the positioning plate 11 facing the clamping arms 6 on both sides, and second arc-shaped portions 13 are provided on the outer wall of the clamping arms 6 facing the positioning plate 11 on one side. The horizontal distance between the two first arc-shaped portions 12 gradually decreases along the direction of gravity. The second arc-shaped portions 13 protrude in a direction away from the center of the clamping arms 6.

[0033] During operation, the device first places the hanger 2 between two adjacent transverse support cables 1, with the transverse support cables 1 positioned above the connecting arm 3. The transverse support cables 1 are then placed in the first clamping groove 4 on the connecting arm 3, and the clamping arms 6 on both sides are swung towards the center. At this time, the positioning blocks 15 at the ends of the clamping arms 6 also move towards the positioning plate 11. Simultaneously, the positioning blocks 15, under the action of the first locking teeth 20, repeatedly push the sliding arm 16 to slide inside the telescopic cavity 14. When the clamping arms 6 are tightly connected to the transverse support cables 1, the transverse support cables 1 fall precisely into the second clamping groove 9, and the positioning blocks 15 also form a stable engagement state through the second locking teeth 19 and the first locking teeth 20 on the positioning plate 11.

[0034] See Figure 1 -Appendix Figure 2 A first clamping groove 4 is provided on the outer wall of the connecting arm 3 on the side away from the direction of gravity, and a second clamping groove 9 is provided on the outer wall of the clamping arm 6 on the side facing the first clamping groove 4. The transverse load-bearing cable 1 is located between the groove wall of the first clamping groove 4 and the groove wall of the second clamping groove 9.

[0035] In some embodiments, to facilitate the fixing of the transverse load-bearing cable 1, the first clamping groove 4 and the second clamping groove 9 together form a cavity for accommodating the transverse load-bearing cable 1. To ensure stable clamping, the diameter of the cavity shared by the first clamping groove 4 and the second clamping groove 9 is smaller than the diameter of the transverse load-bearing cable 1.

[0036] In some embodiments, the clamping arms 6 symmetrically arranged on both sides of the surface of the hanger 2 can form a stable connection between the two and the transverse load-bearing cable 1, providing stable conditions for the connection of the wire harness.

[0037] In some embodiments, the hanger 2 provided on one side of the transverse load-bearing cable 1 enables the cable to be connected to the hanger 2 and performs a lifting function. The connecting arm 3 and the clamping arm 6 can quickly connect to the transverse load-bearing cable 1, and fix the two through the action of the positioning block 15 and the positioning plate 11, which can provide a stable reinforcement.

[0038] See appendix Figure 3 -Appendix Figure 5 Both the first clamping groove 4 and the second clamping groove 9 have protrusions 10 on their inner walls.

[0039] In some embodiments, the first clamping groove 4 and the second clamping groove 9 enable the transverse load-bearing cable 1 to be stably accommodated between the connecting arm 3 and the clamping arm 6. In order to further improve the stability and friction during fixing and prevent the transverse load-bearing cable 1 from accidentally loosening and slipping, protrusions 10 are provided on the inner walls of the first clamping groove 4 and the second clamping groove 9.

[0040] See Figure 2and attached Figure 5 The end of the connecting arm 3 away from the positioning plate 11 is provided with a swing shaft 7, and the clamping arm 6 is provided with a swing seat 8. The clamping arm 6 is rotatably mounted on the swing shaft 7 through the swing seat 8.

[0041] In some embodiments, in order to swing the clamping arm 6 and thereby quickly fix the transverse load-bearing cable 1, a structure of a swing seat 8 and a swing shaft 7 that cooperate with each other is designed, and the clamping arm 6 can swing relative to the swing shaft 7.

[0042] See appendix Figure 3 -Appendix Figure 5 The straight suspension cable includes a positioning block 15. A telescopic cavity 14 is provided on the second arc-shaped part 13. Part of the positioning block 15 is located in the telescopic cavity 14, and part of the positioning block 15 is located between the first arc-shaped part 12 and the second arc-shaped part 13. The clamping arm 6 is fixed to the first arc-shaped part 12 through the positioning block 15.

[0043] In some embodiments, since the clamping arm 6 swings toward the positioning plate 11, the arcs of the first arc portion 12 and the second arc portion 13 have the same direction and there is a certain interval between them. Therefore, when the clamping arm 6 swings, the area above the first arc portion 12 will not interfere with the swing of the clamping arm 6.

[0044] See appendix Figure 3 -Appendix Figure 4 The telescopic cavity 14 includes a telescopic inner cavity 1401 and a telescopic outer cavity 1402. The telescopic outer cavity 1402 is located near the opening of the telescopic cavity 14. A fixed boss 1403 is provided on the inner wall of the telescopic outer cavity 1402, and the fixed boss 1403 protrudes from the side wall of the telescopic inner cavity 1401. A sliding arm 16 is fixedly provided on the outer wall of the positioning block 15 facing the bottom wall of the telescopic inner cavity 1401. The sliding arm 16 is movably disposed in the telescopic cavity 14. A limiting boss 18 is provided on the outer wall of the sliding arm 16 facing the bottom wall of the telescopic inner cavity 1401.

[0045] In some embodiments, the connection between the sliding arm 16 and the positioning block 15 makes the movement of the positioning block 15 more stable. This design allows the positioning block 15 and the positioning plate 11 to form an effective engagement, thereby fixing the clamping arm 6.

[0046] When the sliding arm 16 reciprocates along the telescopic cavity 14, a fixed boss 1403 structure is designed to limit its movement and prevent it from accidentally falling off. The telescopic outer cavity 1402 is connected to the outside and its inner diameter is smaller than that of the telescopic inner cavity 1401, so the fixed boss 1403 faces the bottom wall of the telescopic inner cavity 1401.

[0047] See appendix Figure 3 -Appendix Figure 5The straight suspension cable includes a return spring 17, one end of which is connected to the bottom wall of the telescopic inner cavity 1401, and the other end of which is connected to the limiting boss 18.

[0048] In some embodiments, the telescopic cavity 14 formed on the surface of the clamping arm 6 allows the sliding arm 16 to slide in the telescopic cavity 14 when the clamping arm 6 swings inward, and also provides a stable space for the extension and retraction of the return spring 17.

[0049] When the positioning block 15 and the positioning plate 11 form a stable engagement, the return spring 17 will push the positioning block 15 outward, so that the positioning plate 11 and the positioning block 15 can maintain a stable connection.

[0050] When disassembly or assembly is required, the return spring 17 can also provide space and elasticity for the positioning block 15 to retract inward. When the transverse load-bearing cable 1 needs to be disassembled, the positioning block 15 is first pulled inward and moved towards the telescopic cavity 14. After the second locking tooth 19 on the positioning block 15 disengages from the first locking tooth 20 on the positioning plate 11, the positioning block 15 automatically returns to its original position under the action of the return spring 17.

[0051] See appendix Figure 1 and attached Figure 4 The outer wall of the first arc-shaped part 12 is provided with a first locking tooth 20, and the outer wall of the positioning block 15 is provided with a second locking tooth 19.

[0052] In some embodiments, the outer walls on both sides of the positioning plate 11 are arc-shaped, and the first locking teeth 20 are arranged at equal intervals along the first arc-shaped portion 12, and the second locking teeth 19 are arranged at equal intervals along the second arc-shaped portion 13. The structural shapes of the first locking teeth 20 and the second locking teeth 19 are matched, thereby further improving the meshing and locking effect.

[0053] In some embodiments, while the clamping arm 6 drives the positioning block 15 to swing relative to the connecting arm 3, the positioning block 15 moves along the first arc-shaped portion 12 on both sides of the positioning plate 11, so that the positioning block 15 can stably connect with the positioning plate 11 and the first locking tooth 20 and complete the locking operation.

[0054] In some embodiments, during the swinging process, in order to ensure that the positioning block 15 rotates with the swinging of the clamping arm 6 and engages more and more tightly with the first arcuate portions 12 on both sides of the positioning plate 11, the first arcuate portions 12 on both sides extend toward the connecting arm 3. That is, the distance of the first arcuate portions 12 in the horizontal direction gradually decreases along the direction of gravity.

[0055] See appendix Figure 1 -Appendix Figure 2 and attached Figure 5The hanger 2 is also equipped with a sling ring 5, and the sling ring 5 is located on the side of the hanger 2 facing the direction of gravity.

[0056] In some embodiments, the integrally formed sling ring 5 and the hanger 2 can make the whole more stable, and during operation, in order to avoid the positioning plate 11 interfering with the sling ring 5, the sling ring 5 is located below the positioning plate 11.

[0057] In some embodiments, the sling ring 5 is used to install and secure other related devices and equipment.

[0058] See appendix Figure 2 -Appendix Figure 3 A handle is also provided on the outer wall of the positioning block 15.

[0059] In some embodiments, when the transverse support cable 1 is connected and fixed, the clamping arm 6 is swung toward the hanger 2. At this time, the positioning block 15 at the end of the clamping arm 6 also moves toward the positioning plate 11. Simultaneously, the positioning block 15, under the action of the first locking tooth 20, repeatedly pushes the sliding arm 16 to slide inside the telescopic cavity 14. When the clamping arm 6 is tightly connected to the transverse support cable 1, the positioning block 15 also forms a stable engagement state through the second locking tooth 19 and the first locking tooth 20 on the positioning plate 11.

[0060] In some embodiments, when it is necessary to disassemble the hanger 2 and the transverse load cable 1, first pull the positioning block 15 outward by the handle (not shown). At this time, the sliding arm 16 slides toward the telescopic inner cavity 1401. Finally, the second locking tooth 19 on the positioning block 15 disengages from the first locking tooth 20 on the positioning plate 11, and then the clamping arm 6 is flipped over.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A straight drop wire for use in the flexible cross span of railway contact network, characterized in that, include: Multiple transverse load-bearing cables (1); Hanger (2) is used to connect and fix two adjacent transverse load-bearing cables (1); The hanger (2) is provided with connecting arms (3) on both sides. The hanger (2) is provided with a positioning plate (11) extending in the direction away from gravity. A clamping arm (6) is rotatably installed at the end of the connecting arm (3) away from the positioning plate (11). The clamping arm (6) is located on the side of the connecting arm (3) away from gravity. The positioning plate (11) is located between the two clamping arms (6). The transverse load-bearing cable is located between the clamping arm (6) and the connecting arm (3). The positioning plate (11) has a first arc-shaped part (12) on the outer wall of the clamping arm (6) on both sides, and a second arc-shaped part (13) is provided on the outer wall of the clamping arm (6) on the side facing the positioning plate (11). The horizontal distance between the first arc-shaped portions (12) on both sides gradually decreases along the direction of gravity; the second arc-shaped portion (13) protrudes in a direction away from the center of the clamping arm (6).

2. The straight suspension string according to claim 1, characterized in that, The connecting arm (3) has a first clamping groove (4) on the outer wall of the side away from the direction of gravity, and the clamping arm (6) has a second clamping groove (9) on the outer wall of the side facing the first clamping groove (4), and the transverse load-bearing cable (1) is located between the groove wall of the first clamping groove (4) and the groove wall of the second clamping groove (9).

3. The straight suspension string according to claim 2, characterized in that, Both the first clamping groove (4) and the second clamping groove (9) have protrusions (10) on their inner walls.

4. The straight suspension string according to any one of claims 1-3, characterized in that, The connecting arm (3) is provided with a swing shaft (7) at one end away from the positioning plate (11), and a swing seat (8) is provided on the clamping arm (6). The clamping arm (6) is rotatably mounted on the swing shaft (7) through the swing seat (8).

5. The straight suspension string according to any one of claims 1-3, characterized in that, The straight suspension cable includes a positioning block (15), and a telescopic cavity (14) is provided on the second arc-shaped part (13). Part of the positioning block (15) is located inside the telescopic cavity (14), and part of the positioning block (15) is located between the first arc-shaped part (12) and the second arc-shaped part (13). The clamping arm (6) is fixed to the first arc-shaped part (12) by the positioning block (15).

6. The straight suspension string according to claim 5, characterized in that, The telescopic cavity (14) includes a telescopic inner cavity (1401) and a telescopic outer cavity (1402). The telescopic outer cavity (1402) is located near the opening of the telescopic cavity (14). A fixed protrusion (1403) is provided on the inner wall of the telescopic outer cavity (1402), and the fixed protrusion (1403) protrudes from the side wall of the telescopic inner cavity (1401). A sliding arm (16) is fixedly provided on the outer wall of the positioning block (15) facing the bottom wall of the telescopic cavity (1401). The sliding arm (16) is movably disposed in the telescopic cavity (14). A limiting boss (18) is provided on the outer wall of the sliding arm (16) facing the bottom wall of the telescopic cavity (1401).

7. The straight suspension string according to claim 6, characterized in that, The straight suspension cable includes a return spring (17), one end of which is connected to the bottom wall of the telescopic inner cavity (1401), and the other end of which is connected to the limiting boss (18).

8. The straight suspension string according to claim 5, characterized in that, The outer wall of the first arc-shaped part (12) is provided with a first locking tooth (20), and the outer wall of the positioning block (15) is provided with a second locking tooth (19).

9. The straight suspension string according to any one of claims 1-3, characterized in that, The hanger (2) is also provided with a sling ring (5), and the sling ring (5) is located on the side of the hanger (2) facing the direction of gravity.

10. The straight suspension string according to claim 5, characterized in that, A handle is also provided on the outer wall of the positioning block (15).

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