Submarine optical cable repeated bending experiment clamping device
By designing the repeated bending experimental clamping device of submarine optical cable with arc-shaped grooves and articulated structures, the problems of poor adaptability and unstable fixation of U-shaped clamps are solved, and efficient and safe fixation of test cables is achieved, and the accuracy of experimental results is improved. and test efficiency.
Patent Information
- Application Number
- CN202420371159.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-28
AI Technical Summary
In the repeated bending experiments of existing submarine optical cables, the U-shaped fixture has poor adaptability, unstable fixing, insufficient friction, complicated operation and unsightly appearance, resulting in loose test cables, inaccurate fiber attenuation, and low testing efficiency.
Design a submarine optical cable repeated bending experiment clamping device composed of clamping module and pressing module. The clamping module adopts small arc grooves and large arc groove structures, and firmly fixes through articulation and fastening structures. The clamping module is The material is 40Cr, the pressing module is No. 45 steel, and the anti-slip convex and limit steps are designed to prevent retraction and displacement.
It improves the fixing safety of the test cable and the accuracy of the experimental results, simplifies the operation process, improves the testing efficiency, and improves the aesthetics and adaptability of the experimental equipment.
Smart Images
Figure CN222144702U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a submarine optical cable repeated bending test clamping device, belonging to the technical field of submarine optical cable test equipment. Background Art
[0002] During the transportation, laying and use of submarine optical cables, they may be repeatedly bent. In order to ensure the integrity of the sheath and the fiber attenuation does not exceed the specified value during the repeated bending process, it is necessary to conduct repeated bending tests on the designed and produced submarine optical cables. Figure 1 As shown:
[0003] The test cable 1 is fixed on the swing arm 2 of the repeated bending test equipment. An outward force F is applied to the test cable fixing point 3 below to tighten the test cable. The equipment circulates around the swing axis 4. The test cable 1 swings from the vertical position to the right extreme position, then swings to the left extreme position, and then returns to the initial vertical position, which constitutes one cycle. Unless otherwise specified in the detailed specifications, the bending rate should be about 2s per cycle, and the fiber attenuation changes should be monitored during the test.
[0004] In the experiment, the test cable needs to be fixed on the swing arm at the fixed position. Figure 1 The "test cable fixing point" shown in the figure adopts a U-shaped clamp (such as Figure 2 ) for fixing, one end of the U-shaped clamp is fixed on the swing arm, when in use, unscrew the nuts at both ends and place the test cable between the two half clamps, and often use iron wire to tie the test cable to the swing arm to strengthen the fixing effect and prevent the test cable from loosening during the experiment. However, the above solution has the following shortcomings:
[0005] 1. Safety: The adaptability of the U-shaped clamp is relatively poor. The size of the U-shaped clamp is standard, while the outer diameter of the test cable is not fixed, so it needs to be fixed with iron wire. Even so, there may be a situation where the iron wire is not tied firmly enough, so that the test cable is loose and thrown out during the experiment, which poses a great safety hazard.
[0006] 2. Effectiveness: The U-shaped clamp is too narrow, and the contact area with the test cable is small, resulting in insufficient friction. Therefore, the test cable will retract during the experiment, which will affect the attenuation of the optical fiber and the experimental results.
[0007] 3. Convenience: During the test process, each time the sample is changed, the Haversian fixture needs to be completely disassembled and a new sample cable needs to be reinstalled. When switching to test cables of different specifications, the entire test fixture needs to be replaced. In addition, the wire binding and disassembly need to be repeated, which makes the operation cumbersome and the test efficiency low.
[0008] 4. Aesthetics: Wire binding will make the experimental equipment very messy and the appearance is not very beautiful. Utility Model Content
[0009] The utility model aims to provide a submarine optical cable repeated bending test clamping device to solve the problem of the test cable being loose and thrown out during the experiment and ensure the safety of the experiment.
[0010] The technical solution of the utility model is as follows: a submarine optical cable repeated bending test clamping device, which is characterized by being composed of two major parts: a clamping module and a pressing module, wherein:
[0011] The clamping module comprises a half structure consisting of an upper clamping module and a lower clamping module, wherein the contact surfaces of the upper clamping module and the lower clamping module are respectively provided with small arc grooves; when the upper and lower clamping modules are closely matched, the two small arc grooves form a cavity for clamping and fixing the test cable;
[0012] The clamping module comprises a half structure consisting of an upper clamping module and a lower clamping module, wherein the contact surfaces of the upper clamping module and the lower clamping module are respectively provided with large arc grooves; when the upper and lower clamping modules are tightly fitted, the two large arc grooves form a cavity for clamping and fixing the entire clamping module; one side of the upper and lower clamping modules realizes relative rotation through a hinge structure, and the other side realizes clamping and fixing through a fastening structure.
[0013] In the above scheme, the clamping module is composed of two half blocks to form a quasi-cylindrical body. The outer diameter of the middle section is consistent with the inner diameter of the large arc groove of the clamping module. Multiple sets of clamping modules can be customized according to the size of commonly used test cables (in order to match test cables with different outer diameters, different clamping modules have different sizes of small arc grooves, but the same outer diameter). During the experiment, only the clamping module needs to be replaced. The material of the clamping module can be 40Cr, which is easy to process and not easy to rust while ensuring strength. The clamping module is composed of an upper and lower clamping module composed of two half blocks. The lower clamping module is welded to the repeated bending test device. The upper clamping module can be flipped through the hinged structure to facilitate the placement of the clamping module. The clamping module and the test cable can be fixed through the fastening structure to ensure that the test cable will not loosen and fall out.
[0014] Furthermore, the upper clamping module and the lower clamping module are respectively provided with a plurality of anti-slip ridges in their small arc grooves.
[0015] During the experiment, the fixed and stretched test cable often becomes loose after several bending cycles, and the retraction of the test cable will affect the test results. Therefore, anti-slip ridges are designed on the inner side of the clamping module.
[0016] Furthermore, the upper clamping module is provided with radial fixing protrusions on both sides of the small arc groove; the lower clamping module is provided with radial fixing grooves on both sides of the small arc groove; when the upper and lower clamping modules are tightly fitted, the radial fixing protrusions are located in the corresponding radial fixing grooves, and the dimensions ensure that the two are fully embedded, preventing the contact surfaces of the upper and lower clamping modules from being misaligned or displaced in the radial direction, and avoiding the situation where the test cable and the clamping module are not tightly fitted.
[0017] Furthermore, both ends of the upper clamping module and the lower clamping module are provided with limiting steps, which cooperate with the end face of the pressing module to prevent the clamping module from being displaced along the axial direction of the test cable in the pressing module. After the clamping module is installed in the pressing module, the limiting steps can ensure that the clamping module is fixed in the pressing module, avoiding the displacement or even falling out of the clamping module when the test cable is subjected to force.
[0018] Furthermore, the hinge structure includes: an upper connecting ring, two lower connecting rings, a first fixing bolt, and two first fixing nuts. An upper connecting ring is fixed to the upper pressing module, and two lower connecting rings are fixed to the lower pressing module. The upper connecting ring is located between the two lower connecting rings. The first fixing bolt passes through the three connecting rings in sequence. The two first fixing nuts are respectively screwed with the two ends of the first fixing bolt to form a tubular connecting hinge. The upper and lower pressing modules are connected by the tubular connecting hinge on the left side, which is firm and easy to maintain.
[0019] Further, the fastening structure includes: a pressing connecting rod, a fastening nut, a second fixing bolt, and a second fixing nut; the upper pressing module and the lower pressing module are respectively provided with corresponding upper through-grooves and lower through-grooves, and the corresponding upper and lower through-grooves form a complete through-grooves, and a pressing connecting rod is placed in a complete through-grooves;
[0020] The lower pressing module is provided with a through hole at the position of the lower through slot, and the through hole is perpendicular to the lower through slot; the head of the pressing connecting rod is provided with a through hole, and the pressing connecting rod is located in the corresponding upper and lower through slots;
[0021] The second fixing bolt passes through the through hole and the through hole of the compression connecting rod head in sequence, and both ends of the second fixing bolt are tightened by the second fixing nut respectively, so that all the compression connecting rod heads are locked together;
[0022] All the pressing connecting rods respectively pass through the upper and lower pressing modules, and the tails of all the pressing connecting rods pass through the upper through slots and are respectively locked by fastening nuts, and the fastening nuts are tightly attached to the top of the upper pressing module.
[0023] In the above scheme, three through grooves of equal width are opened on the right side of the upper and lower clamping modules for installing three clamping links of the same size. At the same time, the lower clamping module is opened with a through hole for inserting the second fixing bolt therein and locking it with the second fixing nut. The clamping link is locked by the fastening nut at the upper clamping module. The clamping link is a key component to ensure that the test cable is firmly installed after the clamping module is installed into the clamping module. The clamping force between the upper and lower clamping modules is adjusted by adjusting the tightness of the fastening nut. All components of the clamping module, the fastening structure, and the hinged structure are made of 45# steel and are blackened. They are strong enough and not easy to rust.
[0024] Furthermore, the head of the compression connecting rod is a flat structure matching the lower through groove, and its outer end surface is an arc surface.
[0025] In the above scheme, considering the convenience of use and structural reliability, the structure of the clamping link does not need to be too complicated. When in use, it is only necessary to loosen the fastening nut upwards. Since the head of the clamping link is fixed by the second fixing bolt, it only needs to rotate around the second fixing bolt as the center of the circle. Therefore, the bottom (head) of the clamping link needs to be designed as an arc surface. However, to ensure that the force on the clamping link is large enough, the flat head of the clamping link needs to be designed to be thick enough so that the flat head can be designed to be tangent to the inner wall of the through groove of the clamping module.
[0026] When the utility model is used, the clamping module that matches the size of the test cable is prepared in advance: first, loosen the fastening nut until it does not hinder the movement of the clamping link, and then turn the clamping link outward from the through groove on the side; then open the upper clamping module, put in the lower clamping module, and put the test cable into the small arc groove of the lower clamping module; then put the upper clamping module in and match it with the lower clamping module to ensure that the radial fixing groove and the radial fixing protrusion are fully matched; finally, cover the upper clamping module, push back the clamping link, and tighten the fastening nut. Install the clamping device at the other end of the test cable in the above steps, the only difference is that when installing the second clamping device, it is necessary to ensure that the test cable is in a straight state.
[0027] Compared with the prior art, the utility model has the following beneficial effects:
[0028] 1. Safety: The size of the small arc groove of the clamping module can be customized, which is more compatible with the test cable. Therefore, the test cable will not be loosened and thrown out during the experiment due to poor adaptability, which greatly enhances the safety of the experiment.
[0029] 2. Effectiveness: The clamping device has a large axial dimension (along the axial direction of the coastal cable), a larger contact area with the test cable, and uses a unique anti-slip edge design, which more effectively prevents the test cable from retracting during the experiment, ensuring that the test results will not be affected by this situation.
[0030] 3. Convenience: When facing test cables of various specifications, this clamping device only needs to replace the clamping module according to the size of the test cable, and only needs to tighten the three fastening nuts to achieve the tightening effect. The operation is simple and more convenient, and the test efficiency is greatly improved.
[0031] 4. Aesthetics: The lower pressing module of the clamping device is welded to the repeated bending test device, and the fixing method is more standardized and safe. The appearance is more consistent with the test equipment and more beautiful.
[0032] The utility model replaces the U-shaped clamp in previous tests. When the clamping device of the utility model is used to perform repeated bending tests on submarine optical cables, more manpower and time are not required, the test efficiency is improved, the cost is saved, the safety is increased, and the accuracy of the test results is also guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is a schematic diagram of the experimental process in the background technology;
[0034] Figure 2 The U-shaped clamp in the background technology;
[0035] Figure 3 It is a structural schematic diagram of the clamping device of the utility model;
[0036] Figure 4 It is a structural schematic diagram of the clamping module in the utility model;
[0037] Figure 5 It is a structural schematic diagram of the lower clamping module in the utility model;
[0038] Figure 6 for Figure 5 A partial enlarged view of the middle and lower clamping module at the small arc groove;
[0039] Figure 7 This is a schematic diagram of the structure of the compression module in the utility model;
[0040] Figure 8 It is a cross-sectional schematic diagram of the clamping device of the utility model;
[0041] Fig. 9 This is a state diagram of the clamping device of the utility model fixing the test cable;
[0042] Fig.10 It is a cross-sectional view of the anti-slip ridge in the utility model;
[0043] In the figure: test cable 1, swing arm 2, test cable fixing point 3, swing shaft 4, clamping module 5, upper clamping module 5-1, lower clamping module 5-2, small arc groove 5-3, anti-slip ridge 5-4, inclined surface 5-4-1, long side 5-4-2, radial fixing protrusion 5-5, radial fixing groove 5-6, limiting step 5-7, pressing module 6, upper pressing module 6-1, lower pressing module 6-2, upper connecting ring 6-3, lower connecting ring 6-4, first fixing bolt 6-5, first fixing nut 6-6, pressing connecting rod 6-7, tightening nut 6-8, second fixing bolt 6-9, second fixing nut 6-10, through groove 6-11, through hole 6-12, through hole 6-13, large arc groove 6-14. DETAILED DESCRIPTION
[0044] like Figure 3 As shown, a submarine optical cable repeated bending test clamping device is composed of a clamping module 5 and a pressing module 6.
[0045] like Figure 4 As shown, the clamping module 5 comprises an upper clamping module 5-1 and a lower clamping module 5-2. The contact surfaces of the upper clamping module and the lower clamping module are respectively provided with small arc grooves 5-3. The two small arc grooves form a cavity for clamping and fixing the test cable.
[0046] like Figure 5 As shown, a plurality of anti-skid ridges 5-4 are evenly arranged in the small arc grooves of the upper clamping module and the lower clamping module, and the anti-skid ridges are arranged along the circumference of the small arc grooves.
[0047] In one embodiment of the present invention, in order to more effectively avoid the influence of the test cable retraction on the test results, the anti-slip ridge is structurally designed, and its cross section is designed to be trapezoidal, forming a "one-way anti-retraction structure". Figure 6 As shown in the figure, when the test cable is straightened by force F, it will generate a rebound force F1. The direction of F1 is fixed. Therefore, if Fig.10 As shown, the anti-skid ridge is designed to be a structure with a right-angled trapezoidal cross-section. The surface where the right-angled trapezoidal waist is located is the inclined surface 5-4-1, and the direction of the inclined surface is opposite to the direction of F. After the test cable is placed in the compression module, the contact surfaces of the upper and lower clamping modules are compressed, and the inclined surface of the anti-skid ridge will be slightly embedded in the surface of the test cable. At this time, the trapezoidal cross-section design has little effect on the tensioning force of F, because the inclined surface decomposes F, and the anti-skid ridge will only produce very small resistance, that is, the inclined surface reduces the resistance of the test cable in the direction of F, but when F is cancelled, the rebound force will be blocked by the surface where the long side 5-4-2 of the trapezoid is located, that is, because the anti-skid ridge is slightly embedded in the surface of the test cable, the retraction of the test cable is effectively prevented.
[0048] In one embodiment of the present invention, Figure 4As shown, the upper clamping module is provided with radial fixing protrusions 5-5 on both sides of the small arc groove, and the lower clamping module is provided with radial fixing grooves 5-6 on both sides of the small arc groove; when the upper and lower clamping modules are tightly fitted, the radial fixing protrusions are located in the corresponding radial fixing grooves to prevent the contact surfaces of the upper and lower clamping modules from being misaligned in the radial direction.
[0049] In one embodiment of the present invention, Figure 4 As shown, both ends of the upper clamping module and the lower clamping module are provided with limiting steps 5-7 respectively, and the limiting steps cooperate with the end surface of the pressing module to prevent the clamping module from axially displacing along the test cable in the pressing module.
[0050] The clamping module 6 includes an upper clamping module 6-1 and a lower clamping module 6-2. The contact surfaces of the upper clamping module and the lower clamping module are respectively provided with large arc grooves 6-14. The two large arc grooves form a cavity for clamping and fixing the entire clamping module. One side of the upper clamping module and the lower clamping module is achieved by a hinge structure to achieve relative rotation, and the other side is achieved by a fastening structure to achieve clamping and fixing.
[0051] like Figure 7 As shown, the hinge structure includes: an upper connecting ring 6-3, two lower connecting rings 6-4, a first fixing bolt 6-5, and two first fixing nuts 6-6. An upper connecting ring is fixedly connected to the upper pressing module, and two lower connecting rings are fixedly connected to the lower pressing module. The upper connecting ring is located between the two lower connecting rings. The first fixing bolt passes through the three connecting rings in sequence. The two first fixing nuts are respectively screw-locked with the two ends of the first fixing bolt to realize the flipping and closing of the upper pressing module.
[0052] like Figure 7 As shown, the fastening structure includes: a clamping link 6-7, a fastening nut 6-8, a second fixing bolt 6-9, and a second fixing nut 6-10; the upper clamping module and the lower clamping module are respectively provided with three groups of corresponding upper through grooves and lower through grooves, and the corresponding upper and lower through grooves form a complete through groove 6-11, and a complete through groove is used to place a clamping link; the lower clamping module is provided with a through hole 6-12 at the position of the lower through groove, and the through hole is perpendicular to the lower through groove; the head of the clamping link is provided with a through hole 6-13, and the second fixing bolt passes through the through hole and the through hole of the head of the clamping link in turn, and the two ends of the second fixing bolt are respectively tightened by the second fixing nut to lock all the heads of the clamping links together; the tails of all the clamping links pass through the upper through groove and are respectively locked by the fastening nuts, and the fastening nuts are tightly attached to the top of the upper clamping module.
[0053] In one embodiment of the utility model, the head of the pressing connecting rod is a flat structure matching the lower through groove, and its outer end surface is an arc surface.
[0054] In one embodiment of the present invention, the clamping module may be made of 40Cr, and all components of the pressing module, the fastening structure, and the hinged structure may be made of No. 45 steel.
Claims
1. A clamping device for repeated bending test of submarine optical cable, characterized in that: include: The clamping module comprises a half structure consisting of an upper clamping module and a lower clamping module; the contact surfaces of the upper clamping module and the lower clamping module are respectively provided with small arc grooves for fixing the test cable; The clamping module comprises a half structure consisting of an upper clamping module and a lower clamping module; the contact surfaces of the upper clamping module and the lower clamping module are respectively provided with large arc grooves for fixing the clamping module; one side of the upper clamping module and the lower clamping module realizes relative rotation through a hinge structure, and the other side realizes clamping and fixing through a fastening structure.
2. The submarine optical cable repeated bending test clamping device according to claim 1 is characterized in that: The upper clamping module and the lower clamping module are respectively provided with a plurality of anti-slip ridges in their small arc grooves.
3. The submarine optical cable repeated bending test clamping device according to claim 1 is characterized in that: The upper clamping module is provided with radial fixing protrusions on both sides of the small arc groove; the lower clamping module is provided with radial fixing grooves on both sides of the small arc groove; the radial fixing protrusions are located in the corresponding radial fixing grooves to prevent radial displacement of the upper and lower clamping modules.
4. A submarine optical cable repeated bending test clamping device according to claim 1 or 3, characterized in that: Both ends of the upper clamping module and the lower clamping module are respectively provided with limiting steps, and the limiting steps cooperate with the end surface of the pressing module to prevent the clamping module from axial displacement in the pressing module.
5. The submarine optical cable repeated bending test clamping device according to claim 1 is characterized in that: The hinge structure comprises: An upper connecting ring, fixedly connected to the upper pressing module; Two lower connecting rings are fixedly connected to the lower pressing module, and the upper connecting ring is located between the two lower connecting rings; A first fixing bolt passes through the three connecting rings in sequence; The two first fixing nuts are respectively thread-locked with the two ends of the first fixing bolt to form a tubular connecting hinge.
6. A submarine optical cable repeated bending test clamping device according to claim 1 or 5, characterized in that: The fastening structure comprises: a pressing connecting rod and a fastening nut; the pressing connecting rod passes through the upper and lower pressing modules and is locked by the fastening nut.
7. The submarine optical cable repeated bending test clamping device according to claim 6 is characterized in that: The fastening structure further includes a second fixing bolt and a second fixing nut; the upper pressing module and the lower pressing module are respectively provided with corresponding upper through grooves and lower through grooves; The lower pressing module is provided with a through hole at the position of the lower through slot, and the through hole is perpendicular to the lower through slot; the head of the pressing connecting rod is provided with a through hole, and the pressing connecting rod is located in the corresponding upper and lower through slots; The second fixing bolt passes through the through hole and the through hole of the clamping connecting rod head in sequence, and both ends of the second fixing bolt are tightened by second fixing nuts respectively; the tail of the clamping connecting rod passes through the upper through groove and is locked by the tightening nut.
8. The submarine optical cable repeated bending test clamping device according to claim 7 is characterized in that: The head of the pressing connecting rod is a flat structure matching the lower through groove, and its outer end surface is an arc surface.