Adjustable optical fiber pre-tightening device

Abstract

An adjustable optical fiber pre-tightening device disclosed by the present invention comprises a bottom plate, the top of the bottom plate is provided with a mounting assembly, the top of the mounting assembly is provided with a pre-tightening assembly, the top of the pre-tightening assembly is provided with an optical fiber fixing assembly, and the left and right sides of a movable block are fixedly provided with fixing plates. And the second screw rods are inserted into the corresponding fixing plates. The invention relates to the technical field of optical fiber communication. According to the adjustable optical fiber pre-tightening device, the arc-shaped grooves of the bottom block and the movable block vertically correspond to each other and are symmetrical, a first rotary knob is rotated to drive a first screw rod to rotate, the movable block can stably move downwards along a second screw rod, an optical fiber is tightly clamped between the two arc-shaped grooves, and anti-skid grooves in the arc-shaped grooves further enhance friction force; compared with a traditional simple clamp or adhesive tape fixing mode, the optical fiber pre-tightening device can effectively prevent the optical fiber from deviating or loosening in the pre-tightening process, the stability and reliability of optical fiber fixing are remarkably improved, and the stability of signal transmission is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber communication, in particular to an adjustable optical fiber pre-tightening device. Background Art

[0002] In recent years, the advancement of fiber-optic communications toward ultra-high speeds and ultra-large capacity, coupled with the widespread application of fiber-optic sensing in extreme environment monitoring, has placed higher demands on the stability and repeatability of the fiber manufacturing process. While some improved fixtures have emerged, such as those using spring-loaded or pneumatically actuated fixtures, these still present challenges such as complex structures, limited adjustment ranges, and the inability to monitor preload in real time. Furthermore, under complex operating conditions (such as high temperature, high humidity, or dynamic loads), the reliability of traditional fixtures is further reduced, making them difficult to meet the demands of high-precision manufacturing.

[0003] Therefore, there is an urgent need to develop an optical fiber fixing device with a compact structure, adjustable preload and real-time feedback function to solve the problems of poor optical fiber fixing stability, inaccurate preload control, and low installation and maintenance efficiency in the existing technology, thereby improving the optical fiber manufacturing quality and process controllability, and providing technical support for the large-scale production of high-performance optical fibers. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides an adjustable optical fiber pre-tightening device to solve the above problems.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an adjustable optical fiber pre-tightening device comprises a bottom plate, the top of the bottom plate is provided with a mounting assembly, the top of the mounting assembly is provided with a pre-tightening assembly, the top of the pre-tightening assembly is provided with an optical fiber fixing assembly, the optical fiber fixing assembly comprises a bottom block and a movable block, the top of the bottom block and the bottom of the movable block are both provided with an arc groove, the outer side of the bottom block is fixedly installed with a bracket, the top of the bracket is screwed through by a first screw, the bottom of the first screw is rotatably connected to the top of the movable block, the movable block is located above the corresponding bottom block, and two sides of the bottom of the bracket are fixedly installed with a second screw on both sides of the bottom block, the left and right sides of the movable block are fixedly installed with a fixing plate, the second screw is inserted into the corresponding fixing plate, the outer side of the second screw is screwed with a nut, the nut is fitted above the fixing plate, and the top of the bottom plate is fixedly installed with a controller.

[0006] Preferably, a first knob is fixedly mounted on the top of the first screw rod, a fiber rod is fixedly mounted on the top of the movable block, and the top of the fiber rod is movable and passes through the interior of the bracket.

[0007] Preferably, the arc groove inside the bottom block and the arc groove inside the movable block correspond to each other in upper and lower positions, the upper and lower arc grooves are symmetrical to each other, and anti-slip grooves are provided inside the arc grooves.

[0008] Preferably: the pre-tightening assembly includes a top plate, a slide groove is provided inside the top plate, a slider is slidably connected inside the slide groove, a pull block is fixedly installed on the top of the slider, the bottom block is slidably connected to the top of the corresponding top plate, and a tension sensor is fixedly installed between the pull block and the corresponding bottom block.

[0009] Preferably, vertical plates are fixedly installed on both the front and rear sides of the bottom of the top plate, a third screw is rotatably connected between the two vertical plates, and the third screw is threadedly connected and passes through the interior of the corresponding slider.

[0010] Preferably, a motor is fixedly mounted on the back of the back vertical plate, an output end of the motor movably passes through the interior of the vertical plate and is fixedly connected to the third screw, and the controller is electrically connected to the tension sensor and the motor.

[0011] Preferably, the mounting assembly includes a mounting plate, which is fixedly mounted on the bottom of the corresponding vertical plate, a combination block is fixedly mounted on the top of the base plate, a mounting groove is provided at the bottom of the mounting plate, and the combination block is inserted into the corresponding mounting groove.

[0012] Preferably, the left and right sides of the combination block are both slidably connected with a clamping block, the left and right inner walls of the installation slot are both provided with clamping teeth, the clamping blocks are inserted into the corresponding clamping teeth, and the outer wall of the clamping block fits with the inner wall of the clamping teeth.

[0013] Preferably: an internal cavity is opened inside the combination block, and a fourth screw is rotatably connected between the front and rear inner walls of the internal cavity. The threads on both sides of the center of the fourth screw have different rotation directions, and the outer sides of the threads of different rotation directions of the fourth screw are screwed with adjustment blocks, and the adjustment block is slidably connected inside the internal cavity. A connecting rod is hinged between the adjustment block and the corresponding card block.

[0014] Preferably, the internal rotation of the assembly block is connected to a rotating rod, the back of the rotating rod is located outside the assembly block, the back of the rotating rod is fixedly mounted with a second knob, and the front of the rotating rod is fixedly mounted on the back of the corresponding fourth screw. Beneficial effects

[0015] The present invention provides an adjustable optical fiber pre-tightening device. Compared with the prior art, it has the following advantages: 1. This adjustable optical fiber pre-tightening device has symmetrically aligned arc grooves on the bottom block and the movable block. By turning the first knob to rotate the first screw, the movable block can be smoothly moved downward along the second screw, tightly clamping the optical fiber between the two arc grooves. The anti-slip grooves in the arc grooves further enhance friction. Compared with traditional simple clamps or tape fixation methods, this can effectively prevent the optical fiber from shifting or loosening during the pre-tightening process, significantly improving the stability and reliability of optical fiber fixation.

[0016] 2. This adjustable optical fiber pre-tightening device drives the third screw through a motor to drive the slider to slide in the slide groove. The tension sensor is used to monitor the tension in real time and transmit the data to the controller. The controller accurately controls the forward and reverse rotation and speed of the motor according to the preset values ​​to achieve precise adjustment of the pre-tightening force. Compared with the traditional method of manually adjusting the pre-tightening force based on human experience, this device can avoid the problem of excessive or insufficient pre-tightening force caused by human factors. It not only improves the accuracy of pre-tightening force adjustment, but also greatly improves work efficiency and reduces optical fiber damage caused by improper pre-tightening force.

[0017] 3. The adjustable optical fiber pre-tightening device adopts an installation structure in which a card block and a card tooth cooperate with each other. When installing, you only need to align the installation slot of the mounting plate with the combination block and turn the second knob to drive the rotating rod and the fourth screw to rotate, so that the adjustment block pushes the card block into the card tooth through the connecting rod to complete the secure installation; when disassembling, turn the second knob in the opposite direction, and the card block will exit the card tooth, so that the mounting plate and the combination block can be easily separated. Compared with traditional devices with complex structures and cumbersome installation and disassembly, this device simplifies the installation and disassembly process, saves time and labor costs, and facilitates the rapid deployment, maintenance and upgrade of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a three-dimensional diagram of the external structure of the present invention; Figure 2 It is a three-dimensional diagram of the back structure of the present invention; Figure 3 This is a three-dimensional diagram of the overall structure of the optical fiber fixing assembly of the present invention; Figure 4 This is a perspective view of the pre-tightening assembly structure of the present invention; Figure 5 This is a perspective view of the side structure of the pre-tightening assembly of the present invention; Figure 6The present invention Figure 5 A magnified view of the structure at center A; Figure 7 This is a perspective view of the overall structure of the mounting assembly of the present invention; Figure 8 This is a perspective view of the disassembled structure of the installation assembly of the present invention; Figure 9 It is a three-dimensional diagram of the internal cross-sectional structure of the combination block of the present invention.

[0020] In the figure: 1. Base plate; 2. Fiber optic fixing assembly; 21. Bottom block; 22. Movable block; 23. Bracket; 24. First screw; 25. First knob; 26. Fiber rod; 27. Second screw; 28. Fixing plate; 29. ​​Nut; 210. Arc groove; 3. Pre-tightening assembly; 31. Top plate; 32. Slide groove; 33. Slider; 34. Pull block; 35. Tension sensor; 36. Vertical plate; 37. Motor; 38. Third screw; 4. Mounting assembly; 41. Mounting plate; 42. Combination block; 43. Rotating rod; 44. Second knob; 45. Mounting groove; 46. Block; 47. Gear; 48. Internal cavity; 49. Fourth screw; 410. Adjustment block; 411. Connecting rod; 5. Controller. DETAILED DESCRIPTION

[0021] It should be noted that in the description of the embodiments of the present application, the terms "front, rear", "left, right", "up, down", etc. indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present application. The terms "install", "connect", and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] The present application will be further described in detail below through the accompanying drawings and examples.

[0023] Reference Figures 1 to 9, the embodiment of the present application provides an adjustable optical fiber pre-tightening device, including a base plate 1, a mounting assembly 4 is provided on the top of the base plate 1, a pre-tightening assembly 3 is provided on the top of the mounting assembly 4, an optical fiber fixing assembly 2 is provided on the top of the pre-tightening assembly 3, the optical fiber fixing assembly 2 includes a bottom block 21 and a movable block 22, the top of the bottom block 21 and the bottom of the movable block 22 are both provided with an arc groove 210, a bracket 23 is fixedly installed on the outer side of the bottom block 21, a first screw 24 is screwed through the top of the bracket 23, the bottom of the first screw 24 is rotatably connected to the top of the movable block 22, the movable block 22 is located above the corresponding bottom block 21, and second screws 27 are fixedly installed on both sides of the bottom of the bracket 23 and on both sides of the bottom block 21, and a fixed plate 28 is fixedly installed on the left and right sides of the movable block 22, the second screw 27 is inserted into the corresponding fixed plate 28, and a nut 29 is screwed on the outer side of the second screw 27, and the nut 29 is fitted on the top of the fixed plate 28, and a controller 5 is fixedly installed on the top of the base plate 1. A first knob 25 is fixedly mounted on the top of the first screw rod 24, and a fiber rod 26 is fixedly mounted on the top of the movable block 22. The top of the fiber rod 26 movably extends through the interior of the bracket 23. The arcuate groove 210 in the bottom block 21 and the arcuate groove 210 in the movable block 22 correspond to each other in vertical position. The upper and lower arcuate grooves 210 are symmetrical to each other, and anti-slip grooves are provided inside the arcuate grooves 210.

[0024] In this embodiment, the optical fiber is first placed in the arc groove 210 at the top of the bottom block 21. Since the arc groove 210 inside the bottom block 21 and the arc groove 210 inside the movable block 22 correspond to each other and are symmetrical, the first knob 25 is turned, and the first knob 25 drives the first screw 24 to rotate. Since the first screw 24 is screwed through the bracket 23 and its bottom is rotatably connected to the top of the movable block 22, the rotation of the first screw 24 causes the movable block 22 to move downward along the second screw 27 until the arc groove at the bottom of the movable block 22 is The groove 210 and the arc groove 210 on the top of the bottom block 21 clamp the optical fiber. The anti-slip groove inside the arc groove 210 can increase the friction between the optical fiber and prevent the optical fiber from sliding, ensuring that the optical fiber is firmly fixed. At the same time, the fiber rod 26 on the top of the movable block 22 moves through the inside of the bracket 23 when the movable block 22 moves, playing a certain guiding role, ensuring that the movable block 22 moves smoothly. When the movable block 22 moves to the appropriate position, tighten the nut 29 to make it fit above the fixed plate 28, further fixing the movable block 22 to prevent it from loosening.

[0025] Reference Figures 1 to 9In one aspect of this embodiment, the preload assembly 3 includes a top plate 31, with a slide groove 32 defined within the top plate 31. A slider 33 is slidably connected within the slide groove 32. A pull block 34 is fixedly mounted on the top of the slider 33. The bottom block 21 is slidably connected to the top of the corresponding top plate 31. A tension sensor 35 is fixedly mounted between the pull block 34 and the corresponding bottom block 21. Vertical plates 36 are fixedly mounted on both the front and rear sides of the bottom of the top plate 31. A third screw 38 is rotatably connected between the two vertical plates 36, and the third screw 38 is threadedly connected and extends through the interior of the corresponding slider 33. A motor 37 is fixedly mounted on the back of the back vertical plate 36. The output end of the motor 37 movably extends through the interior of the vertical plate 36 and is fixedly connected to the third screw 38. The controller 5 is electrically connected to the tension sensor 35 and the motor 37.

[0026] In this embodiment, the pre-tightening assembly 3 is used to achieve precise adjustment of the pre-tightening force of the optical fiber. The motor 37 is started, and the output end of the motor 37 drives the third screw 38 to rotate. Since the third screw 38 is threadedly connected to the interior of the slider 33, and the slider 33 is slidably connected to the slide groove 32 inside the top plate 31, the rotation of the third screw 38 will cause the slider 33 to slide in the slide groove 32. A tension sensor 35 is installed between the pull block 34 at the top of the slider 33 and the bottom block 21. When the slider 33 slides, the pull block 34 and the tension sensor 35 will apply tension to the bottom block 21, thereby generating a pre-tightening force on the optical fiber fixed between the bottom block 21 and the movable block 22. The tension sensor 35 monitors the magnitude of the tension in real time and transmits the data to the controller 5. The controller 5 controls the forward and reverse rotation and speed of the motor 37 according to the preset pre-tightening force value to achieve precise adjustment of the pre-tightening force. When the required pre-tightening force is reached, the motor 37 stops working and the pre-tightening of the optical fiber is completed.

[0027] Reference Figures 1 to 9In one aspect of this embodiment, the mounting assembly 4 includes a mounting plate 41, which is fixedly mounted to the bottom of the corresponding vertical plate 36. A combination block 42 is fixedly mounted to the top of the base plate 1. The bottom of the mounting plate 41 defines a mounting slot 45, into which the combination block 42 is inserted. Clamping blocks 46 are slidably connected to the left and right interiors of the combination block 42. Clamping teeth 47 are defined on the left and right inner walls of the mounting slot 45. The clamping blocks 46 are inserted into the corresponding clamping teeth 47, with the outer walls of the clamping blocks 46 and the inner walls of the clamping teeth 47 abutting each other. The combination block 42 defines an internal cavity 48. A fourth screw 49 is rotatably connected between the front and rear inner walls of the internal cavity 48. The threads on either side of the center of the fourth screw 49 have different rotation directions. Adjustment blocks 410 are threadedly connected to the outer sides of the threads of the different rotation directions of the fourth screw 49. The adjustment blocks 410 are slidably connected to the interior of the internal cavity 48. A connecting rod 411 is hingedly connected between the adjustment blocks 410 and the corresponding clamping blocks 46. The assembly block 42 is internally rotatably connected to a rotating rod 43 , the back of which is located outside the assembly block 42 , a second knob 44 is fixedly mounted on the back of the rotating rod 43 , and the front of the rotating rod 43 is fixedly mounted on the back of the corresponding fourth screw 49 .

[0028] When the second knob 44 is turned, the second knob 44 drives the rotating rod 43 to rotate, and the rotating rod 43 drives the fourth screw 49 to rotate. Since the threads on both sides of the center of the fourth screw 49 have different rotation directions, the adjustment blocks 410 on the outer sides of the threads with different rotation directions will slide in opposite directions in the internal cavity 48, and push the clamping block 46 to move to both sides through the connecting rod 411, so that the clamping block 46 is inserted into the teeth 47 on the left and right inner walls of the mounting groove 45. The outer wall of the clamping block 46 fits with the inner wall of the teeth 47, thereby firmly connecting the mounting plate 41 and the assembly block 42, completing the installation of the device. When disassembling, the second knob 44 is turned in the opposite direction to make the clamping block 46 withdraw from the teeth 47, and the mounting plate 41 and the assembly block 42 can be separated, so that the device can be disassembled conveniently and quickly.

[0029] This device uses a bolt preload sensor model LCZ-208D to detect preload. This sensor operates based on strain measurement, with a strain gauge as its core component. When the optical fiber is preloaded—that is, when slider 33 applies tension to bottom block 21 via pull block 34 and tension sensor 35—the tension on bottom block 21 is transmitted to the sensor connection, causing a slight deformation of the strain gauge within the sensor. According to Hooke's law, the strain on the strain gauge is proportional to the force applied to it, and this deformation causes a change in the gauge's resistance. Controller 5 uses Siemens S7-200SMART series PLC (model: SR20). The controller 5 has a variety of communication interfaces and can be easily connected to the RS485 signal output by the LCZ-208D sensor after signal conversion to achieve stable data reception.

[0030] During the optical fiber pre-tightening process, the LCZ-208D sensor monitors the tension in real time, and transmits the collected electrical signal to the Siemens S7-200 SMART SR20 controller 5 in the form of an RS485 signal after signal conditioning and conversion. The controller 5 is pre-programmed with a standard numerical range of optical fiber pre-tightening force. When the received sensor signal is processed and the reflected pre-tightening force value is lower than the lower limit of the preset range, the controller 5 quickly sends an electrical signal through its output port to start the motor 37. The output end of the motor 37 drives the third screw 38 to rotate, thereby causing the slider 33 to slide in the slide groove 32, increasing the tension on the bottom block 21 through the pull block 34 and the tension sensor 35, thereby improving the pre-tightening force of the optical fiber.

[0031] During this process, the sensor continuously monitors the changes in the preload force and continuously feeds back the real-time data to the controller 5. The controller 5 performs real-time analysis and processing on the feedback data. When the preload force reaches the preset standard range, the controller 5 again sends a control signal through the output port to control the motor 37 to stop working, thereby completing the precise adjustment of the preload force, ensuring that the optical fiber is always in a suitable preload state, and ensuring the stable operation of optical fiber communication or sensing.

[0032] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0033] Working principle: First, place the optical fiber in the arc groove 210 at the top of the bottom block 21. Since the arc groove 210 inside the bottom block 21 and the arc groove 210 inside the movable block 22 are located in a vertically corresponding and symmetrical manner, turn the first knob 25. The first knob 25 drives the first screw 24 to rotate. Since the first screw 24 is screwed through the bracket 23 and its bottom is rotatably connected to the top of the movable block 22, the rotation of the first screw 24 will cause the movable block 22 to move downward along the second screw 27 until the arc groove at the bottom of the movable block 22 is opened. 210 and the arc groove 210 on the top of the bottom block 21 clamp the optical fiber. The anti-slip groove inside the arc groove 210 can increase the friction between the optical fiber and prevent the optical fiber from sliding, ensuring that the optical fiber is firmly fixed. At the same time, the fiber rod 26 on the top of the movable block 22 moves through the inside of the bracket 23 when the movable block 22 moves, playing a certain guiding role, ensuring that the movable block 22 moves smoothly. When the movable block 22 moves to the appropriate position, tighten the nut 29 to make it fit above the fixed plate 28, further fixing the movable block 22 to prevent it from loosening.

[0034] The pre-tightening assembly 3 is used to achieve precise adjustment of the pre-tightening force of the optical fiber. The motor 37 is started, and the output end of the motor 37 drives the third screw 38 to rotate. Since the third screw 38 is threadedly connected to the inside of the slider 33, and the slider 33 is slidably connected to the slide groove 32 inside the top plate 31, the rotation of the third screw 38 will cause the slider 33 to slide in the slide groove 32. A tension sensor 35 is installed between the pull block 34 at the top of the slider 33 and the bottom block 21. When the slider 33 slides, a tension force is applied to the bottom block 21 through the pull block 34 and the tension sensor 35, thereby generating a pre-tightening force on the optical fiber fixed between the bottom block 21 and the movable block 22. The tension sensor 35 monitors the magnitude of the tension in real time and transmits the data to the controller 5. The controller 5 controls the forward and reverse rotation and speed of the motor 37 according to the preset pre-tightening force value to achieve precise adjustment of the pre-tightening force. When the required pre-tightening force is reached, the motor 37 stops working and the pre-tightening of the optical fiber is completed.

[0035] When the second knob 44 is turned, the second knob 44 drives the rotating rod 43 to rotate, and the rotating rod 43 drives the fourth screw 49 to rotate. Since the threads on both sides of the center of the fourth screw 49 have different rotation directions, the adjustment blocks 410 on the outer sides of the threads with different rotation directions will slide in opposite directions in the internal cavity 48, and push the card block 46 to move to both sides through the connecting rod 411, so that the card block 46 is inserted into the teeth 47 on the left and right inner walls of the mounting groove 45. The outer wall of the card block 46 fits into the inner wall of the teeth 47, thereby firmly connecting the mounting plate 41 and the assembly block 42, completing the installation of the device. When disassembling, the second knob 44 is turned in the opposite direction to make the card block 46 withdraw from the teeth 47, and the mounting plate 41 and the assembly block 42 can be separated, so that the device can be disassembled conveniently and quickly.

[0036] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An adjustable optical fiber pre-tightening device, comprising a base plate (1), characterized in that: The top of the base plate (1) is provided with a mounting assembly (4), the top of the mounting assembly (4) is provided with a pre-tightening assembly (3), the top of the pre-tightening assembly (3) is provided with an optical fiber fixing assembly (2), the optical fiber fixing assembly (2) comprises a bottom block (21) and a movable block (22), the top of the bottom block (21) and the bottom of the movable block (22) are both provided with an arc groove (210), a bracket (23) is fixedly mounted on the outside of the bottom block (21), the top of the bracket (23) is screwed with a first screw rod (24), the bottom of the first screw rod (24) is rotated The movable block (22) is movably connected to the top of the movable block (22), and the movable block (22) is located above the corresponding bottom block (21). Second screw rods (27) are fixedly installed on both sides of the bottom of the bracket (23) and located on both sides of the bottom block (21). Fixed plates (28) are fixedly installed on the left and right sides of the movable block (22). The second screw rod (27) is inserted into the corresponding fixed plate (28). The outer side of the second screw rod (27) is screwed with a nut (29), and the nut (29) is fitted on the top of the fixed plate (28). A controller (5) is fixedly installed on the top of the bottom plate (1).

2. The adjustable optical fiber pre-tightening device according to claim 1, characterized in that: A first knob (25) is fixedly mounted on the top of the first screw rod (24), a fiber rod (26) is fixedly mounted on the top of the movable block (22), and the top of the fiber rod (26) is movable and penetrates the interior of the bracket (23).

3. The adjustable optical fiber pre-tightening device according to claim 2, characterized in that: The arc groove (210) inside the bottom block (21) and the arc groove (210) inside the movable block (22) correspond to each other in upper and lower positions, and the upper and lower arc grooves (210) are symmetrical to each other. Anti-slip grooves are provided inside the arc grooves (210).

4. The adjustable optical fiber pre-tightening device according to claim 1, characterized in that: The pre-tightening assembly (3) includes a top plate (31), a slide groove (32) is provided inside the top plate (31), a slider (33) is slidably connected inside the slide groove (32), a pull block (34) is fixedly installed on the top of the slider (33), the bottom block (21) is slidably connected to the top of the corresponding top plate (31), and a tension sensor (35) is fixedly installed between the pull block (34) and the corresponding bottom block (21).

5. The adjustable optical fiber pre-tightening device according to claim 4, characterized in that: Vertical plates (36) are fixedly mounted on both the front and rear sides of the bottom of the top plate (31), and a third screw rod (38) is rotatably connected between the two vertical plates (36). The third screw rod (38) is threadedly connected and passes through the interior of the corresponding slider (33).

6. The adjustable optical fiber pre-tightening device according to claim 5, characterized in that: A motor (37) is fixedly mounted on the back of the back vertical plate (36), and the output end of the motor (37) is movable through the interior of the vertical plate (36) and is fixedly connected to the third screw (38). The controller (5) is electrically connected to the tension sensor (35) and the motor (37).

7. The adjustable optical fiber pre-tightening device according to claim 1, characterized in that: The mounting assembly (4) comprises a mounting plate (41), the mounting plate (41) being fixedly mounted on the bottom of the corresponding vertical plate (36), a combination block (42) being fixedly mounted on the top of the bottom plate (1), a mounting groove (45) being provided at the bottom of the mounting plate (41), and the combination block (42) being plugged into the interior of the corresponding mounting groove (45).

8. The adjustable optical fiber pre-tightening device according to claim 7, characterized in that: The left and right sides of the combination block (42) are both slidably connected to the inside with a clamping block (46), and the left and right inner walls of the installation groove (45) are both provided with a clamping tooth (47). The clamping block (46) is inserted into the corresponding clamping tooth (47), and the outer wall of the clamping block (46) and the inner wall of the clamping tooth (47) are in contact with each other.

9. The adjustable optical fiber pre-tightening device according to claim 8, characterized in that: An internal cavity (48) is provided inside the combination block (42), and a fourth screw (49) is rotatably connected between the front and rear inner walls of the internal cavity (48). The threads on both sides of the center of the fourth screw (49) have different rotation directions. The outer sides of the threads of the fourth screw (49) with different rotation directions are all screwed with an adjustment block (410). The adjustment block (410) is slidably connected inside the internal cavity (48), and a connecting rod (411) is hinged between the adjustment block (410) and the corresponding clamping block (46).

10. The adjustable optical fiber pre-tightening device according to claim 9, characterized in that: The interior of the assembly block (42) is rotatably connected to a rotating rod (43), the back of the rotating rod (43) is located outside the assembly block (42), a second knob (44) is fixedly mounted on the back of the rotating rod (43), and the front of the rotating rod (43) is fixedly mounted on the back of the corresponding fourth screw rod (49).

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