Novel optical cable strain clamp with self-locking structure

Abstract

This invention relates to the field of optical cable tension fittings, and discloses a novel optical cable tension fitting with a self-locking structure, comprising: a basic clamping assembly, with an installation rod fixedly welded between two clamping plates, and inclined plates fixedly welded to the adjacent sides of the two clamping plates; a first locking assembly, with an insert plate slidably connected inside the upper clamping plate, an annular plate fixedly welded to the top of the insert plate, and a slot opened inside the lower clamping plate, the inside of the slot movably fitting against the outside of the insert plate, and the annular rod movably sleeved on the outside of the insert plate; a three-stage locking structure is adopted, consisting of initial clamping with wedge-shaped inclined plates, locking with the insert plate and the annular rod, and tightening with bolts and nuts, with the clamping force increasing step by step, which can firmly fix the wire rope; combined with the triple anti-loosening design of limit pin anti-loosening, L-shaped rod limiting, and limit groove self-locking, it effectively prevents the nuts from loosening and the wire rope from slipping due to vibration, wind, and other factors, resulting in high fixing reliability and long service life.

Description

Technical Field

[0001] This invention relates to the field of optical cable tension fittings, specifically a novel optical cable tension fitting with a self-locking structure. Background Technology

[0002] Tension fittings are an important component of overhead optical cable lines. They are used to fix the optical cable to tension towers, withstand the tension of the optical cable, protect the optical cable from damage, and ensure the safe and stable operation of the line. With the rapid development of communication technology, the coverage of overhead optical cable lines is becoming wider and wider, which puts forward increasingly higher requirements for the reliability and safety of tension fittings.

[0003] Existing optical cable tension fittings have many obvious technical defects: most of them use a single bolt clamping structure with limited clamping force. Under long-term vibration and wind, the nuts are prone to loosening, causing the optical cable to slip or even fall off, posing a serious safety hazard. Although some devices have added anti-loosening washers, the anti-loosening effect is limited and still cannot completely solve the loosening problem.

[0004] Most devices lack an effective self-locking structure, requiring additional wire binding or welding for fixation, making installation cumbersome, labor-intensive, and high-risk due to high-altitude operations. The clamping structure of most devices is poorly designed, easily damaging the outer sheath of the optical cable and affecting its service life. Furthermore, they have poor versatility, with each device only suitable for specific specifications of optical cables, resulting in high operating costs.

[0005] In addition, the existing equipment is inconvenient to maintain. When it becomes loose or damaged, a large number of parts need to be disassembled, which takes a long time and affects the normal operation of the line. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a novel optical cable tension fitting with a self-locking structure to solve the problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A novel optical cable tension fitting with a self-locking structure includes: The basic clamping assembly has an installation rod fixedly welded between two clamping plates, and an inclined plate fixedly welded to the side of the two clamping plates that are close to each other. The first locking assembly has an insert plate slidably connected inside the upper clamping plate, and an annular plate is fixedly welded to the top of the insert plate. The lower clamping plate has a slot inside, and the inside of the slot is movably fitted with the outside of the insert plate. The annular rod is movably sleeved on the outside of the insert plate. The second locking assembly has a U-shaped rod inserted movably inside the annular rod. Two discs and two connecting rings are fixedly welded to the outside of the U-shaped rod. Limiting rods are slidably connected inside the two discs. L-shaped rods are fixedly welded to the outside of the two limiting rods. Pressure plates are fixedly welded to the outside of the two limiting rods. The system includes a self-locking limit assembly, with two bolts passing through the connecting ring and the two clamping plates respectively. Nuts are threaded onto the outer sides of both bolts, and limit pins are passed through the inner sides of both bolts. Limit grooves are formed on the outer sides of both connecting rings.

[0008] Furthermore, the two clamping plates are arranged parallel to each other, the inclined plate extends along the length of the clamping plate, the surface of the inclined plate forms an acute angle with the surface of the clamping plate, and the two inclined plates are arranged opposite each other.

[0009] Furthermore, the axis of the insert plate is perpendicular to the top surface of the clamping plate, the bottom surface of the annular plate can be movably fitted with the top surface of the clamping plate above, the bottom end of the insert plate can extend into the interior of the slot, and the outer surface of the insert plate is clearance-fitted with the inner wall of the slot.

[0010] Furthermore, the annular rod is a closed annular structure, the open end of the U-shaped rod is inserted into the interior of the annular rod, the axis of the U-shaped rod is perpendicular to the axis of the annular rod, and the outer surface of the U-shaped rod is clearance-fitted with the inner wall of the annular rod.

[0011] Furthermore, the two discs are symmetrically arranged along the axis of the U-shaped rod, and a radially extending guide hole is provided inside the disc. The outer surface of the limiting rod is clearance-fitted with the inner wall of the guide hole, and the limiting rod can reciprocate linearly along the length direction of the guide hole.

[0012] Furthermore, the two L-shaped rods are arranged opposite each other, and the ends of the L-shaped rods can be movably fitted together. The surface of the pressure plate is perpendicular to the axis of the limiting rod, and the pressure plate is located between the disc and the connecting ring.

[0013] Furthermore, the axis of the bolt is perpendicular to the side of the clamping plate, the bolt passes through the two clamping plates and the connecting ring in sequence, the bolt has a through hole in its radial direction, the limiting pin passes through the through hole, and the outer surface of the limiting pin is clearance-fitted with the inner wall of the through hole.

[0014] Furthermore, the limiting groove is an arc-shaped groove structure, the limiting groove extends circumferentially along the connecting ring, and the inner wall of the limiting groove can movably fit against the outer surface of the limiting rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This new type of optical cable tension fitting features a self-locking structure and a three-stage locking and anti-loosening structure, ensuring a firm fixation and strong vibration resistance. It employs a three-stage locking structure: initial clamping with a wedge-shaped inclined plate, locking with an insert plate and ring rod, and final tightening with bolts and nuts. The clamping force increases progressively, firmly securing the wire rope. Combined with a triple anti-loosening design featuring a limit pin, L-shaped rod limiting, and self-locking limit groove, it effectively prevents nut loosening and wire rope slippage caused by vibration, wind, and other factors, resulting in high fixation reliability and a long service life.

[0016] 2. This new type of optical cable tension fitting features a self-locking structure. The integrated self-locking design allows for easy operation without the need for additional tools. The limiting rod and limiting groove work together to form an automatic locking structure. When tightening the nut, the limiting rod automatically engages with the limiting groove, achieving self-locking without the need for additional locking components. The L-shaped rod moves synchronously with the limiting rod, automatically forming a second line of defense. The entire installation process can be completed with just a wrench, making operation simple and convenient, significantly reducing high-altitude work time and improving construction efficiency.

[0017] 3. This new type of optical cable tension fitting features a self-locking structure, wedge-shaped clamping, and anti-slip design. It provides strong clamping force without damaging the optical cable. The wedge-shaped clamping space is formed by relatively arranged inclined plates. The greater the tension on the wire rope, the greater the clamping force of the inclined plates on the wire rope, achieving a tightening effect as it is pulled. The surface of the inclined plates is smooth and burr-free, so it will not damage the outer sheath of the optical cable. The arc design of the limiting groove increases the contact area with the limiting rod, disperses the clamping force, and avoids component damage caused by local stress concentration.

[0018] 4. This new type of optical cable tension fitting with a self-locking structure features a modular design, strong versatility, and convenient maintenance. The overall modular design allows for independent molding of each component, making connection simple. It can replace the corresponding size ring rod and U-shaped rod according to different specifications of optical cable wire rope, making it widely adaptable. Wear parts such as bolts, nuts, and limit pins are easy to replace, resulting in low maintenance costs. The device has a compact structure, is lightweight, and is easy to transport and carry at high altitudes. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a side view of the structure of the present invention.

[0021] Figure 3 This is a three-dimensional schematic diagram of the U-shaped rod and related structures of the present invention.

[0022] Figure 4 This is a schematic diagram of the clamping structure of the present invention.

[0023] Figure 5 This is a three-dimensional schematic diagram of the clamping plate and related structures of the present invention.

[0024] Figure 6 This is a schematic diagram of the fixing component of the present invention.

[0025] Figure 7 This is a three-dimensional schematic diagram of the bolt and related structures of the present invention.

[0026] In the diagram: 1. Clamping plate; 2. Mounting rod; 3. Inclined plate; 4. Insert plate; 5. Ring plate; 6. Slot; 7. Ring rod; 8. U-shaped rod; 9. Disc; 10. Connecting ring; 11. Limiting rod; 12. L-shaped rod; 13. Pressure plate; 14. Bolt; 15. Nut; 16. Limiting pin; 17. Limiting groove. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0028] Please refer to the following: Figure 1-7 , A novel optical cable tension fitting with a self-locking structure includes: The basic clamping assembly has an installation rod 2 fixedly welded between two clamping plates 1, and an inclined plate 3 fixedly welded to the side of the two clamping plates 1 that are close to each other. The first locking assembly has an insert plate 4 slidably connected inside the upper clamping plate 1, an annular plate 5 fixedly welded to the top of the insert plate 4, a slot 6 opened inside the lower clamping plate 1, the inside of the slot 6 movably fits against the outside of the insert plate 4, and the annular rod 7 is movably sleeved on the outside of the insert plate 4. The second locking assembly has a U-shaped rod 8 inserted movably inside the ring rod 7. Two discs 9 and two connecting rings 10 are fixedly welded to the outside of the U-shaped rod 8. Limiting rods 11 are slidably connected inside the two discs 9. L-shaped rods 12 are fixedly welded to the outside of the two limiting rods 11. Pressure plates 13 are fixedly welded to the outside of the two limiting rods 11. And a limit self-locking assembly, with two bolts 14 respectively passing through between the connecting ring 10 and the two clamping plates 1, and nuts 15 threadedly connected to the outer side of each of the two bolts 14, and limit pins 16 passing through the inner side of each of the two bolts 14, and limit grooves 17 opened on the outer side of each of the two connecting rings 10. Specifically, the basic clamping assembly consists of two parallel clamping plates 1 that are rigidly welded together with the mounting rod 2 to form the main frame of the device; the inner surfaces of the two clamping plates 1 that are opposite to each other are rigidly welded together with the inclined plate 3 to form a fixed angle with the plate surface of the clamping plate 1. First locking assembly: The interior of the upper clamping plate 1 is slidably fitted with the insert plate 4, allowing the insert plate 4 to reciprocate linearly along its own axis; the top surface of the insert plate 4 is rigidly welded to the annular plate 5 without relative displacement, and the annular plate 5 can limit the maximum downward sliding stroke of the insert plate 4; the interior of the lower clamping plate 1 has a slot 6, the inner wall of the slot 6 is clearance fitted with the outer surface of the insert plate 4, allowing the insert plate 4 to be inserted into the slot 6; the annular rod 7 is a closed annular structure, its internal cavity is movably fitted with the outer surface of the insert plate 4, and the annular rod 7 can rotate around the axis of the insert plate 4; The second locking assembly: The internal cavity of the ring rod 7 and the open end of the U-shaped rod 8 form a movable insertion fit, and the U-shaped rod 8 can be inserted into or withdrawn from the ring rod 7 along its own axis; The outer surface of the U-shaped rod 8 forms a rigid weld fit with the two discs 9 and the two connecting rings 10 respectively without relative displacement; The interior of the two discs 9 forms a sliding fit with the limiting rod 11, and the limiting rod 11 can make linear reciprocating motion along the radial direction of the disc 9; The outer surface of the two limiting rods 11 forms a rigid weld fit with the L-shaped rod 12 and the pressure plate 13 respectively without relative displacement, and the L-shaped rod 12 and the pressure plate 13 can move synchronously with the limiting rod 11; Limiting self-locking assembly: Two bolts 14 pass through the interior of the two clamping plates 1 and the connecting ring 10 respectively, and the axis of the bolts 14 is perpendicular to the side of the clamping plate 1; the outer surface of each bolt 14 is threadedly connected to the nut 15, and the nut 15 can rotate and move along the axis of the bolt 14 to clamp the clamping plate 1 and the connecting ring 10; each bolt 14 has a through hole in its radial interior, and the inner wall of the through hole is clearance-fitted with the outer surface of the limiting pin 16, and the limiting pin 16 can be inserted into or withdrawn from the through hole; the outer surface of the two connecting rings 10 is provided with an arc-shaped limiting groove 17, and the inner wall of the limiting groove 17 can be movably fitted with the outer surface of the limiting rod 11; In the embodiment: the two clamping plates 1 are arranged parallel to each other, the inclined plate 3 extends along the length direction of the clamping plate 1, the plate surface of the inclined plate 3 forms an acute angle with the plate surface of the clamping plate 1, and the two inclined plates 3 are arranged opposite to each other. Specifically, the two clamping plates 1 are arranged parallel to each other to ensure that the clamping force is evenly distributed; the inclined plate 3 extends along the length of the clamping plate 1, and its surface forms an acute angle with the surface of the clamping plate 1; the two inclined plates 3 are arranged opposite to each other to form a wedge-shaped clamping space. In the embodiment: the axis of the insert plate 4 is perpendicular to the top surface of the clamping plate 1, the bottom surface of the annular plate 5 can be movably fitted with the top surface of the upper clamping plate 1, the bottom end of the insert plate 4 can extend into the interior of the slot 6, and the outer surface of the insert plate 4 is clearance-fitted with the inner wall of the slot 6. Specifically, the axis of the insert plate 4 is perpendicular to the top surface of the clamping plate 1; the bottom surface of the annular plate 5 can be movably fitted with the top surface of the upper clamping plate 1, limiting the extreme position of the insert plate 4 sliding downward; the bottom end of the insert plate 4 can extend into the slot 6 of the lower clamping plate 1, and the outer surface of the insert plate 4 and the inner wall of the slot 6 form a precise clearance fit, which limits all displacement of the insert plate 4 in the horizontal direction. In the embodiment: the ring rod 7 is a closed ring structure, the open end of the U-shaped rod 8 is inserted into the interior of the ring rod 7, the axis of the U-shaped rod 8 is perpendicular to the axis of the ring rod 7, and the outer surface of the U-shaped rod 8 is clearance-fitted with the inner wall of the ring rod 7. Specifically, the ring rod 7 is a closed circular ring structure; the open end of the U-shaped rod 8 is inserted into the internal cavity of the ring rod 7, and the axis of the U-shaped rod 8 is perpendicular to the axis of the ring rod 7; the outer surface of the U-shaped rod 8 forms a clearance fit with the inner wall of the ring rod 7, and the U-shaped rod 8 can move relative to the ring rod 7 along its own axis. In the embodiment: two discs 9 are arranged symmetrically along the axis of the U-shaped rod 8. The discs 9 have radially extending guide holes inside. The outer surface of the limiting rod 11 is clearance-fitted with the inner wall of the guide hole. The limiting rod 11 can reciprocate linearly along the length of the guide hole. Specifically, the two discs 9 are symmetrically arranged along the axis of the U-shaped rod 8; each disc 9 has a radially extending guide hole inside; the outer surface of the limiting rod 11 forms a precision clearance fit with the inner wall of the guide hole, which restricts all displacement of the limiting rod 11 in the direction perpendicular to the length of the guide hole, and only allows the limiting rod 11 to make linear reciprocating motion along the length of the guide hole. In the embodiment: two L-shaped rods 12 are arranged opposite each other, the ends of the L-shaped rods 12 can be movably fitted together, the plate surface of the pressure plate 13 is perpendicular to the axis of the limiting rod 11, and the pressure plate 13 is located between the disc 9 and the connecting ring 10. Specifically, two L-shaped rods 12 are arranged opposite each other, and their ends can move and fit together to form a closed limiting structure; the surface of the pressure plate 13 is perpendicular to the axis of the limiting rod 11; the pressure plate 13 is located between the disc 9 and the connecting ring 10, and can transmit clamping force to the limiting rod 11. In the embodiment: the axis of bolt 14 is perpendicular to the side of clamping plate 1. Bolt 14 passes through two clamping plates 1 and connecting ring 10 in sequence. Bolt 14 has a through hole in its radial direction. Limiting pin 16 passes through the through hole. The outer surface of limiting pin 16 is clearance-fitted with the inner wall of the through hole. Specifically, the axis of bolt 14 is perpendicular to the side of clamping plate 1; bolt 14 passes through the interior of two clamping plates 1 and connecting ring 10 in sequence, connecting the three together; a through hole is provided in the radial direction of bolt 14; a limiting pin 16 passes through the through hole, and its outer surface forms a clearance fit with the inner wall of the through hole, and the limiting pin 16 can limit the loosening displacement of nut 15 along the axis of bolt 14. In the embodiment: the limiting groove 17 is an arc-shaped groove structure, the limiting groove 17 extends along the circumference of the connecting ring 10, and the inner wall of the limiting groove 17 can be movably fitted with the outer surface of the limiting rod 11. Specifically, the limiting groove 17 is an arc-shaped groove structure extending circumferentially along the connecting ring 10; the inner wall of the limiting groove 17 can form a movable fit with the outer surface of the limiting rod 11, limiting the outward displacement of the limiting rod 11 along the radial direction of the connecting ring 10. Working principle: Step 1: Pre-operation preparation and component inspection: Place the device on a flat working surface and conduct a comprehensive inspection: check whether the welded joints of the two clamping plates 1 and the mounting rod 2 are firm and free from cracks or deformation; check whether the insert plate 4 can slide freely within the upper clamping plate 1 without jamming; check whether the ring rod 7 and the U-shaped rod 8 are intact and free from cracks or deformation; check whether the limiting rod 11 can slide freely within the disc 9 and whether the L-shaped rod 12 can fit properly; check whether the bolts 14, nuts 15 and limiting pins 16 are properly matched and intact, and whether the threads are stripped; after confirming that all components are in good condition, prepare the optical cable steel wire rope to be fixed. Step 2: Installation and initial fixation of the first locking component: Pull the limiting pin 16 on the left bolt 14 out of the through hole, rotate the left nut 15 and remove it from the bolt 14, then pull the bolt 14 out between the two clamping plates 1; pull the annular plate 5 upward, causing the insert plate 4 to slide upward, so that the bottom end of the insert plate 4 is completely disengaged from the slot 6 of the lower clamping plate 1; remove the annular rod 7 from the insert plate 4; place the optical cable wire rope to be fixed inside the inclined plate 3 between the two clamping plates 1, so that the wire rope is tightly attached to the surface of the inclined plate 3; put the annular rod 7 back on the outside of the insert plate 4, and pull downward. Push the annular plate 5, causing the insert plate 4 to slide downwards, so that the bottom end of the insert plate 4 is inserted into the slot 6 of the lower clamping plate 1, and at the same time, the insert plate 4 penetrates the internal cavity of the annular rod 7; reinsert the left bolt 14 between the two clamping plates 1, so that it penetrates the interior of both the annular plate 5 and the annular rod 7; screw the left nut 15 onto the bolt 14, initially tightening it, so that the two clamping plates 1 clamp the wire rope, and the wire rope is clamped between the wedge-shaped inclined plates 3 under the action of tension; reinsert the limiting pin 16 into the radial through hole of the bolt 14 to complete the first stage of anti-loosening; Step 3: Installation and clamping of the second locking component: Remove the right-side bolt 14 and nut 15 from the connecting ring 10 and clamping plate 1; pull the two pressure plates 13 outward, causing the two limiting rods 11 to slide outward along the guide hole of the disc 9, and the two L-shaped rods 12 to separate accordingly; pass the end of the optical cable wire rope through the inside of the U-shaped rod 8, and adjust the position of the wire rope so that it is located between the two limiting rods 11; push the two pressure plates 13 inward, causing the two limiting rods 11 to slide inward, so that the two limiting rods 11 clamp the wire rope, and at the same time, the ends of the two L-shaped rods 12 fit together to form a closed second limiting defense line; pass the right-side bolt 14 through the inside of the two clamping plates 1 and the two connecting rings 10 in sequence, and screw the right-side nut 15 onto the bolt 14 and tighten it; during the tightening of the nut 15, push the pressure plate 13 to move inward, further causing the limiting rods 11 to clamp the wire rope, and the outer surface of the limiting rod 11 is inserted into the limiting groove 17 on the outside of the connecting ring 10 to achieve self-locking and complete the second-level clamping and fixing; Step 4: Overall tightening and self-locking verification: Tighten the nuts 15 on the left and right sides in sequence to ensure that the two clamping plates 1 and the connecting ring 10 are firmly clamped; check that all connections are secure and there is no looseness; pull the wire rope to verify that the wire rope is firmly fixed and there is no slippage; check that the L-shaped rod 12 fits tightly, that the limiting rod 11 is fully inserted into the limiting groove 17, and that the limiting pin 16 is installed in place; after confirming that all locking and self-locking structures are working properly, the device can be installed at the designated location of the optical cable line. Step 5: Disassembly and Maintenance When disassembling the device, first remove the limit pins 16 from the two bolts 14, unscrew the two nuts 15, and remove the two bolts 14; pull the pressure plate 13 outward to disengage the limit rod 11 from the limit groove 17 and release the wire rope; pull the annular plate 5 upward to disengage the insert plate 4 from the slot 6, remove the annular rod 7, and the wire rope can be taken out between the two clamping plates 1; regularly check whether the various parts of the device are worn, deformed, or corroded, and replace damaged parts in time; regularly tighten the nuts 15 to ensure sufficient clamping force; apply grease to the threaded parts to prevent rust.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel optical cable tension fitting with a self-locking structure, characterized in that, include: The basic clamping assembly has an installation rod (2) fixedly welded between two clamping plates (1), and an inclined plate (3) fixedly welded to the side of the two clamping plates (1) that are close to each other. The first locking assembly has an insert plate (4) slidably connected inside the upper clamping plate (1), and an annular plate (5) is fixedly welded to the top of the insert plate (4). The lower clamping plate (1) has a slot (6) inside, and the inside of the slot (6) is movably fitted to the outside of the insert plate (4). The annular rod (7) is movably sleeved on the outside of the insert plate (4). The second locking assembly has a U-shaped rod (8) inserted movably inside the annular rod (7). Two discs (9) and two connecting rings (10) are fixedly welded to the outside of the U-shaped rod (8). Limiting rods (11) are slidably connected inside the two discs (9). L-shaped rods (12) are fixedly welded to the outside of the two limiting rods (11). Pressure plates (13) are fixedly welded to the outside of the two limiting rods (11). And a self-locking limit assembly, two bolts (14) are respectively installed between the connecting ring (10) and the two clamps (1), the outer sides of the two bolts (14) are threaded with nuts (15), the inner sides of the two bolts (14) are provided with limit pins (16), and the outer sides of the two connecting rings (10) are provided with limit grooves (17).

2. The novel optical cable tension fitting with a self-locking structure according to claim 1, characterized in that, The two clamping plates (1) are arranged parallel to each other, the inclined plate (3) extends along the length direction of the clamping plate (1), the plate surface of the inclined plate (3) forms an acute angle with the plate surface of the clamping plate (1), and the two inclined plates (3) are arranged opposite to each other.

3. The novel optical cable tension fitting with a self-locking structure according to claim 1, characterized in that, The axis of the insert plate (4) is perpendicular to the top surface of the clamping plate (1). The bottom surface of the annular plate (5) can be movably fitted with the top surface of the clamping plate (1). The bottom end of the insert plate (4) can extend into the interior of the slot (6). The outer surface of the insert plate (4) is in clearance fit with the inner wall of the slot (6).

4. A novel optical cable tension fitting with a self-locking structure according to claim 1, characterized in that, The ring rod (7) is a closed ring structure. The open end of the U-shaped rod (8) is inserted into the interior of the ring rod (7). The axis of the U-shaped rod (8) is perpendicular to the axis of the ring rod (7). The outer surface of the U-shaped rod (8) is in clearance fit with the inner wall of the ring rod (7).

5. A novel optical cable tension fitting with a self-locking structure according to claim 1, characterized in that, The two disks (9) are arranged symmetrically along the axis of the U-shaped rod (8). The disks (9) have radially extending guide holes inside. The outer surface of the limiting rod (11) is in clearance fit with the inner wall of the guide hole. The limiting rod (11) can reciprocate linearly along the length of the guide hole.

6. A novel optical cable tension fitting with a self-locking structure according to claim 1, characterized in that, The two L-shaped rods (12) are arranged opposite each other, and the ends of the L-shaped rods (12) can be movably fitted together. The surface of the pressure plate (13) is perpendicular to the axis of the limiting rod (11). The pressure plate (13) is located between the disc (9) and the connecting ring (10).

7. A novel optical cable tension fitting with a self-locking structure according to claim 1, characterized in that, The axis of the bolt (14) is perpendicular to the side of the clamp (1). The bolt (14) passes through the two clamps (1) and the connecting ring (10) in sequence. The bolt (14) has a through hole in its radial direction. The limiting pin (16) passes through the through hole. The outer surface of the limiting pin (16) is clearance-fitted with the inner wall of the through hole.

8. A novel optical cable tension fitting with a self-locking structure according to claim 1, characterized in that, The limiting groove (17) is an arc-shaped groove structure. The limiting groove (17) extends circumferentially along the connecting ring (10). The inner wall of the limiting groove (17) can be movably fitted with the outer surface of the limiting rod (11).

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