Sectional type chemical corrosion control process and device for optical fiber capillary tube

Abstract

The invention relates to the technical field of optical fiber corrosion devices, in particular to an optical fiber capillary sectional type chemical corrosion control process and device. Comprising the following steps that SS1, preparation and feeding are conducted in advance, specifically, an optical fiber tube to be corroded is fixed to the bottom ends of mandrels of five clamping systems through rapid clamps, a cleaning tank is filled with 99.5% ethyl alcohol cleaning liquid, an ultrasonic cleaning unit is started, the power is 300 W, the frequency is 40 kHz, 50% hydrofluoric acid is injected into a pre-corrosion tank, the temperature is controlled to 43 DEG C through an electric heating jacket, and the ultrasonic cleaning unit is started; 60% hydrofluoric acid is injected into the fine corrosion tank, the temperature is controlled to be 45 DEG C through an electric heating jacket, 45% hydrofluoric acid is injected into the transition corrosion tank, the temperature is controlled to be 44 DEG C through the electric heating jacket, the electric heating jacket of the drying cylinder and the hot air drying device are started, the temperature is controlled to be 60 DEG C, and the air speed is 0.5 m / s. The method has the beneficial effects that the problem that in the prior art, a single tank and a single parameter cannot meet the requirements of three stages of pre-corrosion softening, main corrosion reducing and post-corrosion transition is solved through a pre-corrosion, main corrosion and post-corrosion segmented gradient process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber corrosion device, in particular to a segmented chemical corrosion control process and device for optical fiber capillary. BACKGROUND

[0002] In the field of preparation of optical fiber laser and optical fiber passive devices, the diameter precision of optical fiber capillary and the smoothness of the corrosion transition section directly determine the optical performance of the device. If there is a step mutation or diameter fluctuation in the transition section, it will cause additional loss when the optical signal is transmitted, and even cause interface reflection interference, so it is necessary to accurately control the optical fiber diameter and the transition section shape through the chemical corrosion process. In the prior art, a patent document with publication number CN111153609A discloses an optical fiber corrosion device. The above-mentioned corrosion device adopts a single-stage single-parameter corrosion mode, that is, the entire corrosion process is completed by only one corrosion tank, a fixed concentration of hydrofluoric acid, a single temperature interval and a single dynamic parameter. It cannot provide a gradient corrosion environment according to the differentiated process requirements of the three core stages of pre-corrosion softening, main corrosion diameter reduction and post-corrosion transition of optical fiber corrosion, ultimately resulting in two key defects. The first is that the transition section has pseudo-smoothness, which cannot meet the stress-free mutation requirements of high-precision devices. The second is that the transition section length consistency is poor in batch production, which restricts industrial application. Based on this, the present application provides a segmented chemical corrosion control process and device for optical fiber capillary to solve the problems raised in the background art. SUMMARY

[0003] The present application provides a segmented chemical corrosion control process and device for optical fiber capillary to solve the problems of the prior art that the existing device cannot effectively solve the mutation area in the optical fiber corrosion process and the pseudo-smoothness of the transition section.

[0004] The technical solution of the present application to solve the above technical problems is as follows: a segmented chemical corrosion control process for optical fiber capillary, comprising the following steps: SS1, prepare and load in advance, fix the optical fiber tube to be corroded on the bottom end of the five clamping systems through the quick clamp respectively, fill the cleaning tank with 99.5% ethanol cleaning solution and start the ultrasonic cleaning unit, the power is 300W and the frequency is 40kHz, inject 50% hydrofluoric acid into the pre-corrosion tank and control the temperature to 43℃ through the electric heating jacket, inject 60% hydrofluoric acid into the precision corrosion tank and control the temperature to 45℃ through the electric heating jacket, inject 45% hydrofluoric acid into the transition corrosion tank and control the temperature to 44℃ through the electric heating jacket, start the electric heating jacket of the drying cylinder and the hot air drying device to control the temperature to 60℃, and the wind speed is 0.5m / s; SS2, pretreatment, the optical fiber tube is transported to the top of the cleaning tank, the optical fiber tube is completely immersed in the cleaning liquid by the axial pushing cylinder, the rotation mechanism is started to drive the mandrel to rotate at 10 rpm, the radial vibration frame is vibrated radially at 5 mu amplitude, and the optical fiber tube is cleaned for 5 minutes in this state; After cleaning, the optical fiber tube is naturally dried, and the initial outer diameter data of the optical fiber tube is collected by the laser outer diameter measuring instrument on the outlet side of the cleaning tank and fed back to the central control unit. SS3, pre-etching, the optical fiber tube is transported to the top of the pre-etching tank, the rotation mechanism is started to make the pre-etching tank and the stirring paddle rotate in opposite directions, the stirring paddle rotates at 150 rpm, the optical fiber tube is immersed to a depth of 6 mm by the axial pushing cylinder, the mandrel is driven to rotate at 10 rpm, and the radial vibration frame is vibrated at an amplitude of 5 mu; the dynamic parameters are maintained for 4 minutes of continuous etching; During etching, the axial pushing cylinder drives the axial moving plate to complete the downward 20 mu and upward 25 mu action every 1 minute, and the optical fiber tube is taken out after etching; SS4, main etching treatment, the optical fiber tube is transported to the top of the precision etching tank, the rotation mechanism is started to make the precision etching tank and the stirring paddle rotate in opposite directions at 150 rpm, the initial immersion depth of the optical fiber tube is controlled by the axial pushing cylinder, the mandrel is driven to rotate at 22 rpm, and the radial vibration frame is vibrated at an amplitude of 25 mu; the state is maintained for 6 minutes of etching; During etching, the axial moving plate completes the downward 60 mu and upward 52 mu action every 0.6 minute, and the optical fiber tube is taken out after etching; SS5, transition etching treatment, the optical fiber tube is transported to the top of the transition etching tank, the rotation mechanism is started to make the transition etching tank and the stirring paddle rotate in opposite directions at 150 rpm, the initial immersion depth of the optical fiber tube is controlled by the axial pushing cylinder, the mandrel is driven to rotate at 15 rpm, and the radial vibration frame is vibrated at an amplitude of 18 mu; the state is maintained for 5 minutes of etching; During etching, the axial moving plate completes the downward 15 mu and upward 18 mu action every 0.8 minute, and the optical fiber tube is taken out after etching; SS6, post-treatment, the optical fiber tube is transported to the top of the drying cylinder, the rotation of the mandrel and the vibration of the radial vibration frame are turned off, the optical fiber is made to enter the drying cylinder by the axial pushing cylinder, the residual liquid on the surface of the optical fiber tube is scraped off by the fixed scraper at the top of the drying cylinder, and the state is maintained for 5 minutes of drying; After drying, the length and diameter error of the optical fiber transition section are detected by the laser outer diameter measuring instrument, and the single etching process is completed.

[0005] On the basis of the above technical solutions, the application can also be improved as follows.

[0006] As a preferred technical solution of the present invention, the fiber capillary segmented chemical corrosion control device includes a frame, on which a rotating cleaning tank, a pre-corrosion tank, a fine corrosion tank and a transition corrosion tank are sequentially rotatably connected in a counterclockwise direction. Each of the cleaning tank, the pre-corrosion tank, the fine corrosion tank and the transition corrosion tank is provided with a stirring paddle that rotates in the opposite direction to the same axis. A drying cylinder is fixed on the frame. It also includes an intermittently rotating slewing frame, on which five clamping systems are mounted; The clamping system includes a radial vibrating frame slidably connected to a rotary frame, a spring installed between the radial vibrating frame and the rotary frame, a follower roller and a rotating sleeve rotatably connected to the radial vibrating frame, a synchronous shaft and three coaxially arranged camshafts rotatably connected to the rotary frame, a first synchronous belt drivingly connecting the three camshafts to the synchronous shaft, an elastic transmission belt drivingly connecting the synchronous shaft to the rotating sleeve, an eccentric cam installed on each of the three camshafts, the wheel surfaces of the three eccentric cams contacting the follower rollers, and the transmission strokes of the three eccentric cams to the follower rollers being different, an axial push cylinder installed on the rotary frame, an axial shift plate connected to the output end of the axial push cylinder, a mandrel rotatably connected to the axial shift plate, the mandrel rotating synchronously with the rotating sleeve, and a quick clamp for clamping the optical fiber tube at the bottom end of the mandrel; It also includes a rotating mechanism, which drives the spindle to rotate at different speeds at the positions corresponding to the pre-corrosion tank, fine corrosion tank and transition corrosion tank, drives the spindle to rotate at the same speed at the positions corresponding to the cleaning tank and pre-corrosion tank, drives the radial vibrator to vibrate horizontally at different vibration strokes at the positions corresponding to the pre-corrosion tank, fine corrosion tank and transition corrosion tank, and drives the radial vibrator to vibrate at the same vibration stroke at the positions corresponding to the cleaning tank and pre-corrosion tank. It also includes an online detection system for measuring the outer diameter of fiber optic tubes.

[0007] As a preferred technical solution of the present invention, a rotary motor is installed on the frame, and indexing gear rings are installed on both the output shaft of the rotary motor and the rotary frame. The two indexing gear rings mesh with each other, and a central control unit is installed on the end face of the frame.

[0008] As a preferred technical solution of the present invention, a driven wheel is fixedly installed on the follower roller at the position corresponding to the three eccentric cams. The wheel surfaces of the three driven wheels are in rolling contact with the wheel surfaces of the three eccentric cams respectively. Each of the three eccentric cams is provided with a base wheel part and an eccentric protrusion. The three base wheel parts have the same radius and are installed in the same phase on the camshaft. The radii of the three eccentric protrusions decrease sequentially from top to bottom and are installed in the same phase on the camshaft.

[0009] As a preferred technical solution of the present invention, the elastic transmission belt is made of rubber and provides elastic compensation for the vibration stroke of the radial vibrator. The vibration direction of the radial vibrator is perpendicular to the axis of the spindle. A square synchronous section is fixedly provided on the spindle. A square synchronous groove is provided inside the sleeve. The square synchronous groove is slidably connected to the square synchronous section. The cross-sections of the square synchronous groove and the square synchronous section are both regular hexagons.

[0010] As a preferred technical solution of the present invention, the cleaning tank, pre-corrosion tank, fine corrosion tank, transition corrosion tank and drying cylinder are all fitted with electric heating jackets, and the electric heating jackets integrate temperature sensors. The data terminals of the temperature sensors are connected to the central control unit. The bottom of the cleaning tank integrates an ultrasonic cleaning unit, and the bottom of the drying cylinder integrates a hot air drying device. Floating scrapers are slidably connected inside the cleaning tank, pre-corrosion tank, fine corrosion tank and transition corrosion tank. A fixed scraper is fixedly installed on the top of the drying cylinder. Both the floating scraper and the fixed scraper are provided with arrayed holes, and both the floating scraper and the fixed scraper are provided with fiber optic scraper sleeves, the fiber optic scraper sleeves being lined with hydrofluoric acid resistant silicone.

[0011] As a preferred embodiment of the present invention, the rotating mechanism includes a servo motor mounted on a frame and a forward rotating cylinder and a steering shaft rotatably connected to the frame. A reverse rotating shaft is rotatably connected to the forward rotating cylinder. A second synchronous belt is driven to the output shaft of the servo motor. The second synchronous belt is driven to the reverse rotating shaft. A spur gear ring is mounted on the forward rotating cylinder, and a reverse gear ring is mounted on the reverse rotating shaft. Each stirring paddle is equipped with a lower gear that meshes with the spur gear ring. The cleaning tank, pre-corrosion tank, fine corrosion tank, and transition corrosion tank are all equipped with upper gears that mesh with the reverse gear ring. Driven bevel gears are mounted on both the forward rotating cylinder and the reverse rotating shaft. A steering bevel gear is mounted on the steering shaft. Both driven bevel gears are driven to the steering bevel gear. The two driven bevel gears are respectively located on both sides of the steering bevel gear.

[0012] As a preferred embodiment of the present invention, the clamping system further includes three rotating gears with different radii, which are respectively fixedly connected to three camshafts.

[0013] As a preferred embodiment of the present invention, the rotating mechanism further includes a driving gear ring mounted on the counter-rotating shaft. Driven shafts are rotatably connected to the frame at positions corresponding to the cleaning tank, pre-corrosion tank, fine corrosion tank, and transition corrosion tank. Each driven shaft is equipped with a driven gear meshing with the driving gear ring. Each camshaft is equipped with a constant-speed gear, and each constant-speed gear meshes with a corresponding rotating gear. The transmission ratio of the driven shafts to the camshafts on the cleaning tank and pre-corrosion tank is 1:1, the transmission ratio of the driven shafts to the camshafts on the fine corrosion tank is 2.2:1, and the transmission ratio of the driven shafts to the camshafts on the transition corrosion tank is 1.5:1.

[0014] As a preferred technical solution of the present invention, the online detection system includes four laser outer diameter measuring instruments installed on the frame. The four laser outer diameter measuring instruments correspond to the outlet side of the cleaning tank, the pre-corrosion tank, the fine corrosion tank, and the transition corrosion tank. The data output terminals of the four laser outer diameter measuring instruments are all connected to the central control unit.

[0015] The beneficial effects of this invention are: 1. Addressing the problem that existing single-tank, single-parameter technologies cannot meet the requirements of the three stages of pre-corrosion softening, main corrosion diameter reduction, and post-corrosion transition, this invention achieves a precise breakthrough through a segmented gradient process of pre-corrosion, main corrosion, and post-corrosion. The pre-corrosion tank uses 50% hydrofluoric acid at 43°C with a mandrel speed of 10 rpm and an amplitude of 5 μm to achieve gentle softening of the fiber surface. The fine corrosion tank uses 60% hydrofluoric acid at 45°C with a speed of 22 rpm and an amplitude of 25 μm for efficient and uniform diameter reduction. The transition corrosion tank uses 45% hydrofluoric acid at 44°C with a speed of 15 rpm and an amplitude of 18 μm to achieve a smooth transition. The gradient connection of parameters in the three stages eliminates the pseudo-smoothness defect in the transition section, forming a fundamental difference from the existing single-stage fixed-parameter process, and meeting the requirements of stress-free abrupt changes for high-precision devices.

[0016] 2. This invention enhances the uniformity of the corrosion interface through multi-component dynamic collaboration. During operation, the tank and the stirring paddle rotate in opposite directions, the spindle rotation is linked with the radial vibration frame, and the axial push cylinder moves in a regular manner. The reverse rotation of the tank and the paddle eliminates the low-concentration boundary layer on the surface of the optical fiber tube, avoiding local corrosion rate differences. The rotation of the spindle and the radial vibration frame work together to transform the corrosion interface from a fixed static surface into a dynamic expansion surface. The axial push cylinder moves in stages with differentiated actions, further lengthening the transition section. This multi-component linkage and collaboration solves the problem of step-like abrupt changes in the interface caused by unidirectional stirring or stillness in the prior art, ensuring that the corrosion changes continuously and gradually along the axial direction.

[0017] 3. In this invention, batch consistency is improved by linking online detection with a central control closed loop. Data is collected in real time by laser outer diameter measuring instruments at the outlets of the cleaning tank and each corrosion tank, and fed back to the central control unit. Parameters such as the temperature of the heating jacket and the spindle speed are dynamically adjusted to form a detection, feedback, and adjustment closed loop. Compared with the lag of manual timed sampling in the prior art, this linkage system reduces the consistency deviation of the transition section length in batch production, effectively solving the problem of poor consistency in industrial applications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a segmented chemical corrosion control device for fiber optic capillary tubes. Figure 2 for Figure 1 A magnified schematic diagram of the local structure at point A; Figure 3 This is a structural diagram of the driven shaft and the central control unit; Figure 4 This is a schematic diagram of the active gear ring and the laser outer diameter measuring instrument. Figure 5 A schematic diagram of the rotating gear and spring; Figure 6 for Figure 5 A magnified schematic diagram of the local structure at point B; Figure 7 for Figure 5 A schematic diagram of the cross-sectional structure; Figure 8 This is a schematic diagram of the exploded structure of the decomposition tank and the agitator. Figure 9 A schematic diagram of the driven gear and the constant speed gear; Figure 10 This is a schematic diagram of the floating scraper structure.

[0019] The attached diagram lists the components represented by each number as follows: 1. Fiber optic tube; 2. Cleaning tank; 3. Pre-corrosion tank; 4. Fine corrosion tank; 5. Transition corrosion tank; 6. Frame; 7. Agitator; 8. Drying cylinder; 9. Rotary frame; 10. Radial vibrating frame; 11. Spring; 12. Follower roller; 13. Rotating sleeve; 14. Synchronous shaft; 15. Camshaft; 16. Elastic transmission belt; 17. Eccentric cam; 18. Axial push cylinder; 19. Axial shift plate; 20. Mandrel; 21. Quick clamp; 22. Rotary motor; 23. Indexing gear ring; 24. 25. Central control unit; 26. Heating jacket; 27. Temperature sensor; 28. Floating scraper; 29. ​​Fixed scraper; 30. Fiber optic scraper sleeve; 31. Slot; 32. Servo motor; 33. Forward rotating cylinder; 34. Steering shaft; 35. Reverse rotating shaft; 36. Reverse gear ring; 37. Forward gear ring; 38. Lower gear; 39. Upper gear; 40. Rotary gear; 41. Driven gear ring; 42. Driven shaft; 43. Constant speed gear; 44. Laser outer diameter measuring instrument. Detailed Implementation

[0020] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0021] The present invention provides the following preferred embodiments of a segmented chemical etching control process for optical fiber capillaries, comprising the following steps: SS1. Pre-treatment and loading: Fix the fiber optic tube 1 to be etched to the bottom of the mandrel 20 of the five clamping systems using quick clamps 21. Fill the cleaning tank 2 with 99.5% ethanol cleaning solution and start the ultrasonic cleaning unit with a power of 300W and a frequency of 40kHz. Inject 50% hydrofluoric acid into the pre-corrosion tank 3 and control the temperature to 43°C through the electric heating jacket 25. Inject 60% hydrofluoric acid into the fine corrosion tank 4 and control the temperature to 45°C through the electric heating jacket 25. Inject 45% hydrofluoric acid into the transition corrosion tank 5 and control the temperature to 44°C through the electric heating jacket 25. Start the electric heating jacket 25 and hot air drying device of the drying cylinder 8 to control the temperature at 60°C and the wind speed at 0.5m / s. SS2, Pretreatment: Transfer the fiber tube 1 to the top of the cleaning tank 2, and use the axial pushing cylinder 18 to make the fiber tube 1 completely immersed in the cleaning solution. Start the rotation mechanism to drive the spindle 20 to rotate at 10 rpm and the radial vibrator 10 to vibrate radially with an amplitude of 5 μm. Maintain this state for cleaning for 5 min. After cleaning, the fiber optic tube 1 is removed and air-dried naturally. Then, the initial outer diameter data of the fiber optic tube 1 is collected by the laser outer diameter measuring instrument 44 on the outlet side of the cleaning tank 2 and fed back to the central control unit 24. In a preferred embodiment, natural air drying is carried out at 25°C and 40% relative humidity for 2 minutes. SS3, Pre-corrosion: Transfer the fiber optic tube 1 to the top of the pre-corrosion tank 3, start the rotation mechanism to make the pre-corrosion tank 3 and the stirring paddle 7 rotate in opposite directions. The stirring paddle 7 rotates at 150 rpm. The immersion depth of the fiber optic tube 1 is controlled by the axial push cylinder 18 to 6 mm. Drive the spindle 20 to rotate at 10 rpm and the radial vibrator 10 to vibrate at an amplitude of 5 μm. Maintain this dynamic parameter for continuous corrosion for 4 min. During the corrosion process, the axial push cylinder 18 drives the axial moving plate 19 to complete a downward movement of 20μm and an upward movement of 25μm every 1 minute, and the fiber optic tube 1 is removed after corrosion. SS4, main corrosion treatment: transfer the fiber optic tube 1 to the top of the fine corrosion tank 4, start the rotation mechanism to make the fine corrosion tank 4 rotate in the opposite direction of the stirring paddle 7 at 150 rpm, control the initial immersion depth of the fiber optic tube 1 to 15 mm through the axial push cylinder 18, drive the mandrel 20 to rotate at 22 rpm and the radial vibrator 10 to vibrate at an amplitude of 25 μm, maintain this state for corrosion for 6 min. During the corrosion process, the axial moving plate 19 completes a downward movement of 60 μm and an upward movement of 52 μm every 0.6 min, and is removed from the fiber optic tube 1 after corrosion. SS5, Transitional corrosion treatment: Transfer the fiber optic tube 1 to the top of the transitional corrosion tank 5, start the rotation mechanism to make the transitional corrosion tank 5 and the stirring paddle 7 rotate in opposite directions at 150 rpm, control the initial immersion depth of the fiber optic tube 1 to 10 mm by the axial push cylinder 18, drive the mandrel 20 to rotate at 15 rpm and the radial vibrator 10 to vibrate at an amplitude of 18 μm, maintain this state for corrosion for 5 min. During the corrosion process, the axial moving plate 19 completes a downward movement of 15μm and an upward movement of 18μm every 0.8min, and is removed from the fiber optic tube 1 after corrosion. SS6. Post-processing: Transfer the fiber tube 1 to the top of the drying cylinder 8, turn off the rotation of the spindle 20 and the vibration drive of the radial vibrator 10, and use the axial push cylinder 18 to make the fiber enter the drying cylinder 8. Use the fixed scraper 28 at the top of the drying cylinder 8 to scrape off the residual liquid on the surface of the fiber tube 1 and keep it in this state for 5 minutes to dry. After drying, the length and diameter error of the fiber transition section are detected by a laser outer diameter measuring instrument 44 to complete a single etching process.

[0022] The fiber capillary segmented chemical corrosion control device includes a frame 6 and an intermittently rotating rotary frame 9, on which five clamping systems are installed. Five clamping systems are arranged at equal intervals along the 9 circumferences of the rotary frame, with an included angle of 72° between adjacent clamping systems to ensure synchronous docking of different processes. A rotary motor 22 is mounted on the frame 6. Both the output shaft of the rotary motor 22 and the rotary frame 9 are equipped with indexing gear rings 23. The two indexing gear rings 23 mesh with each other. A central control unit 24 is mounted on the end face of the frame 6. The rotary motor 22 drives the rotary frame 9 to rotate intermittently through two meshing indexing gear rings 23, so that the five clamping systems on the rotary frame 9 can be precisely connected to the cleaning tank 2, pre-corrosion tank 3, fine corrosion tank 4, transition corrosion tank 5 and drying cylinder 8 in sequence, without the need for manual transfer of fiber optic tube 1. The central control unit 24 receives sensor data from each process in real time and sends control commands to the rotating mechanism, axial push cylinder 18, and electric heating jacket 25 simultaneously to achieve full-process parameter linkage. This structure avoids the offset of the fiber optic tube 1 caused by manual handling, ensuring that the fiber optic tube 1 is always in the center of the tank axis during each corrosion process, and the corrosion interface will not change unilaterally due to eccentricity. At the same time, the PID adjustment and parameter linkage of the central control unit 24 ensures that the consistency deviation of the transition section length of the fiber optic tube 1 in mass production is ≤30μm, and transforms the abrupt change zone into a smooth transition section. The frame 6 is connected in a counterclockwise direction to a rotating cleaning tank 2, a pre-corrosion tank 3, a fine corrosion tank 4, and a transition corrosion tank 5. Each of the cleaning tank 2, the pre-corrosion tank 3, the fine corrosion tank 4, and the transition corrosion tank 5 is equipped with a stirring paddle 7 that rotates in the opposite direction to the frame 6. A drying cylinder 8 is fixed on the frame 6. The agitator 7 is made of corrosion-resistant polytetrafluoroethylene, and the agitator 7 has five blades; The rotating mechanism drives the cleaning tank 2, the pre-corrosion tank 3, etc. to rotate clockwise, and at the same time drives the stirring paddle 7 inside the tank to rotate counterclockwise through gear transmission. The stirring paddle 7 is made of polytetrafluoroethylene material that is resistant to hydrofluoric acid corrosion and can be immersed for a long time without corrosion failure. The counter-rotation of the tank and the agitator 7 can enhance solvent convection, eliminate the low-concentration boundary layer near the surface of the fiber optic tube 1, and avoid the local corrosion rate difference caused by static or unidirectional stirring. A uniform concentration environment causes the corrosion interface to spread uniformly along the axial direction of the fiber optic tube 1, rather than being fixed at a certain point and forming a step-like abrupt change. The polytetrafluoroethylene material can also avoid solvent pollution caused by corrosion and leaching of traditional metal agitators, ensuring stable hydrofluoric acid corrosion activity and providing a uniform environment for gradient corrosion of pre-corrosion, main corrosion and transition corrosion, helping to form a continuous and gradual transition section. Electric heating jackets 25 are fitted on the cleaning tank 2, pre-corrosion tank 3, fine corrosion tank 4, transition corrosion tank 5 and drying cylinder 8. Temperature sensors 26 are integrated inside the electric heating jackets 25. The data terminal of the temperature sensor 26 is connected to the central control unit 24. Each tank is equipped with a corrosion-resistant drain valve at the bottom. The waste liquid is discharged into a special waste liquid treatment device for hydrofluoric acid through a polytetrafluoroethylene pipeline. After treatment, the pH value is adjusted to 6 to 8 before being discharged. The central control unit 24 has a built-in PID temperature control algorithm; The electric heating jacket 25, which is fitted around each tank and the drying cylinder 8, provides a heating source. The internally integrated temperature sensor 26 collects the solvent temperature in real time. After the data is transmitted to the central control unit 24, the built-in PID algorithm dynamically adjusts the heating power of the electric heating jacket 25 according to the set temperature and the actual temperature deviation to achieve closed-loop temperature control. This scheme strictly controls the temperature fluctuation of each corrosion process within ±0.1℃, ensuring a stable hydrofluoric acid corrosion rate and avoiding sudden changes in corrosion rate caused by rapid temperature rises and falls. By stabilizing the rate, the diameter change becomes gradual, eliminating the rate-induced cause of step-like abrupt changes; The bottom of the cleaning tank 2 is integrated with an ultrasonic cleaning unit, and the bottom of the drying cylinder 8 is integrated with a hot air drying device. Floating scrapers 27 are slidably connected inside the cleaning tank 2, the pre-corrosion tank 3, the fine corrosion tank 4 and the transition corrosion tank 5. The inner walls of the cleaning tank 2, pre-corrosion tank 3, fine corrosion tank 4 and transition corrosion tank 5 are all provided with two guide grooves, and two symmetrically arranged guide blocks that are slidably connected to the guide grooves are installed on the floating scraper 27. Transitional corrosion tank 5 corresponds to the transitional corrosion process; The top of the drying cylinder 8 is fixedly equipped with a fixed scraper 28. Both the floating scraper 27 and the fixed scraper 28 are provided with arrayed holes 30, and both the floating scraper 27 and the fixed scraper 28 are provided with fiber optic scraper sleeves 29, with the fiber optic scraper sleeves 29 lined with hydrofluoric acid resistant silicone. The clamping system includes a radial vibrating frame 10 slidably connected to the rotary frame 9, a spring 11 installed between the radial vibrating frame 10 and the rotary frame 9, a follower roller 12 and a rotating sleeve 13 rotatably connected to the radial vibrating frame 10, and a synchronous shaft 14 and three coaxially arranged camshafts 15 rotatably connected to the rotary frame 9 via a deep groove ball bearing, with a first synchronous belt drivingly connecting the three camshafts 15 and the synchronous shaft 14. The axes of the three camshafts 15 are on the same straight line; A flexible transmission belt 16 is used to connect the synchronous shaft 14 and the rotating sleeve 13. The elastic transmission belt 16 is made of nitrile rubber and provides elastic compensation for the vibration stroke of the radial vibrator 10. The two ends of the elastic transmission belt 16 are respectively sleeved on the driven pulley of the synchronous shaft 14 and the driving pulley of the swivel sleeve 13. The elastic deformation of the elastic transmission belt 16 provides adaptive compensation for the maximum vibration stroke of the radial vibrator 10 ± 25 μm. Each of the three camshafts 15 is equipped with an eccentric cam 17. The wheel surfaces of the three eccentric cams 17 are in contact with the follower roller 12, and the transmission stroke of the three eccentric cams 17 to the follower roller 12 is different. A driven wheel is fixedly installed on the follower roller 12 at the position corresponding to the three eccentric cams 17. The wheel surfaces of the three driven wheels are in rolling contact with the wheel surfaces of the three eccentric cams 17 respectively. Each of the three eccentric cams 17 is provided with a base wheel part and an eccentric protrusion. The three base wheel parts have the same radius and are installed in the same phase on the camshaft 15. The radii of the three eccentric protrusions decrease sequentially from top to bottom and are installed in the same phase on the camshaft 15. In a preferred embodiment, the drive strokes of the three eccentric cams 17 from top to bottom are 25mm, 18mm and 5mm, respectively; The clamping system also includes three rotating gears 39 with different radii, which are respectively fixedly connected to three camshafts 15; An axial push cylinder 18 is installed on the rotary frame 9. An axial shift plate 19 is connected to the output end of the axial push cylinder 18. A spindle 20 is rotatably connected to the axial shift plate 19. The spindle 20 rotates synchronously with the rotating sleeve 13. A quick clamp 21 for holding the optical fiber tube 1 is provided at the bottom end of the spindle 20. The optical fiber tube 1 to be etched is a quartz optical fiber capillary with an initial outer diameter of 280 μm. The clamping force of the quick clamp 21 is controlled by adjusting the bolt. The inner side of the quick clamp 21 is lined with a polytetrafluoroethylene gasket to avoid damaging the surface of the optical fiber tube 1. The camshaft 15 on the rotary frame 9 drives three eccentric cams 17 to rotate. The cam wheel surface pushes the follower roller 12 to make the radial vibrating frame 10 move radially in a direction perpendicular to the axis of the spindle 20. The spring 11 between the radial vibrating frame 10 and the rotary frame 9 provides the restoring force, forming reciprocating vibration. Synchronous shaft 14 drives camshaft 15 to rotate via first synchronous belt. At the same time, elastic transmission belt 16 made of nitrile rubber transmits rotational torque to sleeve 13, which in turn drives spindle 20 to rotate. Elastic transmission belt 16 can adaptively deform and compensate for the ±25μm maximum vibration stroke of radial vibrator 10. The difference in the eccentric convex radius of the three eccentric cams 17 enables the differentiated vibration parameters required for each corrosion process; The pre-corrosion process uses a small amplitude of 5μm to avoid excessive disturbance to the initial corrosion interface, the fine corrosion process uses a large amplitude of 25μm to lengthen the corrosion interface, and the transition corrosion process uses a medium amplitude of 18μm to optimize the smoothness of the transition. The combined effect of rotation and radial vibration transforms the corrosion interface from a fixed static surface into a dynamic expansion surface, elongating the abrupt change zone. The elastic transmission belt 16 solves the problem of jamming during vibration in traditional rigid transmission, ensuring that the spindle 20 rotates in sync with the vibration and avoiding corrosion interface shift caused by transmission instability. The quick clamp 21 at the bottom of the mandrel 20 changes the clamping gap by adjusting the bolts to adapt to optical fiber tubes 1 with different cladding diameters. The polytetrafluoroethylene gasket on the inside of the quick clamp 21 is in direct contact with the surface of the optical fiber tube 1. The clamping force is adjusted by the bolts to ensure that the optical fiber tube 1 is stable and does not damage the surface.

[0023] The vibration direction of the radial vibrator 10 is perpendicular to the axis of the spindle 20. A square synchronous section is fixedly installed on the spindle 20. A square synchronous groove is opened inside the sleeve 13. The square synchronous groove is slidably connected to the square synchronous section. The cross-sections of the square synchronous groove and the square synchronous section are both regular hexagonal. When the spindle 20 moves up and down along the axial direction with the axial moving plate 19, the regular hexagonal square synchronous section on its surface slides in the regular hexagonal square groove of the sleeve 13. At the same time, the rotational torque is transmitted through the surface contact of the hexagonal structure, ensuring that the spindle 20 always rotates synchronously with the sleeve 13 during the axial displacement process. It also includes a rotating mechanism, which drives the spindle 20 to rotate at different speeds at positions corresponding to the pre-corrosion tank 3, the fine corrosion tank 4 and the transition corrosion tank 5, drives the spindle 20 to rotate at the same speed at positions corresponding to the cleaning tank 2 and the pre-corrosion tank 3, drives the radial vibrator 10 to vibrate horizontally at positions corresponding to the pre-corrosion tank 3, the fine corrosion tank 4 and the transition corrosion tank 5 with different vibration strokes, and drives the radial vibrator 10 to vibrate at positions corresponding to the cleaning tank 2 and the pre-corrosion tank 3 with the same vibration stroke. The rotating mechanism includes a servo motor 31 mounted on a frame 6 and a forward rotating cylinder 32 and a steering shaft 33 rotatably connected to the frame 6. A reverse rotating shaft 34 is rotatably connected to the forward rotating cylinder 32. A second synchronous belt is driven to the output shaft of the servo motor 31. The second synchronous belt is driven to the reverse rotating shaft 34. A spur gear ring 36 is mounted on the forward rotating cylinder 32. A reverse gear ring 35 is mounted on the reverse rotating shaft 34. Each stirring paddle 7 is equipped with a lower gear 37 that meshes with the spur gear ring 36. An upper gear 38 that meshes with the reverse gear ring 35 is mounted on the cleaning tank 2, the pre-corrosion tank 3, the fine corrosion tank 4, and the transition corrosion tank 5. Driven bevel gears are mounted on the forward rotating cylinder 32 and the reverse rotating shaft 34. A steering bevel gear is mounted on the steering shaft 33. Both driven bevel gears are driven to the steering bevel gear. The two driven bevel gears are respectively located on both sides of the steering bevel gear. The servo motor 31 drives the anti-rotation shaft 34 to rotate via the second synchronous belt, and the anti-rotation gear ring 35 on the anti-rotation shaft 34 drives each tank to rotate clockwise. At the same time, the driven bevel gear on the counter-rotating shaft 34 drives the driven bevel gear on the rotating shaft 33 to rotate, causing the rotating cylinder 32 to rotate counterclockwise. The spur gear ring 36 on the rotating cylinder 32 drives the stirring paddle 7 in each tank to rotate counterclockwise, thus realizing the tank rotating in the forward direction and the paddle rotating in the reverse direction. A single servo motor 31 can drive all tanks and the stirring paddle 7 to rotate in opposite directions, ensuring that all tanks rotate at the same speed and the stirring paddle 7 rotate at the same speed. A uniform corrosion environment avoids abrupt changes in batches caused by differences in corrosion rates between different tanks, reduces the length deviation of the transition section of the same batch of fiber optic tubes, ensures that the corrosion interface is always in a uniform dynamic environment, and eliminates the sudden changes caused by the fixed interface and multi-motor errors of the existing device. The rotating mechanism also includes a drive gear ring 40 mounted on the counter-rotating shaft 34, and driven shafts 41 rotatably connected to the frame 6 at positions corresponding to the cleaning tank 2, pre-corrosion tank 3, fine corrosion tank 4, and transition corrosion tank 5. Each driven shaft 41 is equipped with a driven gear 42 that meshes with the drive gear ring 40. Each camshaft 15 is equipped with a constant speed gear 43, and each constant speed gear 43 meshes with a rotating gear 39 at a corresponding position. The transmission ratio of the driven shafts 41 to the camshafts 15 on the cleaning tank 2 and pre-corrosion tank 3 is 1:1, the transmission ratio of the driven shafts 41 to the camshafts 15 on the fine corrosion tank 4 is 2.2:1, and the transmission ratio of the driven shafts 41 to the camshafts 15 on the transition corrosion tank 5 is 1.5:1. The driving gear ring 40 on the counter-rotating shaft 34 drives the driven shaft 41 of each process to rotate. The driven shaft 41 meshes with the rotating gear 39 on the camshaft 15 through the constant speed gear 43. By using different transmission ratios, the rotation speed of the same driving gear ring 40 is converted into the differentiated rotation speed of the camshaft 15, thereby enabling the spindle 20 to obtain the required rotation speed of each process. Differentiated transmission ratios enable gradient speed corrosion. In the pre-corrosion process, low speed and small amplitude slowly soften the cladding to form a slow corrosion initiation point, avoiding the sudden change of the initial interface caused by high speed. In the fine corrosion process, high speed and large amplitude quickly and uniformly reduce the diameter, lengthening the corrosion interface. In the transition corrosion process, medium speed and medium amplitude finely adjust the diameter, so that the transition section smoothly transitions from the fast corrosion value to the target value. This gradient rotation speed and amplitude matching gradually lengthens the abrupt change zone, solving the problem that a single rotation speed cannot adapt to multi-stage corrosion. It also includes an online detection system for measuring the outer diameter of the fiber optic tube 1.

[0024] The online inspection system includes four laser outer diameter measuring instruments 44 installed on the frame 6. The four laser outer diameter measuring instruments 44 correspond to the outlet side of the cleaning tank 2, the pre-corrosion tank 3, the fine corrosion tank 4, and the transition corrosion tank 5. The data output terminals of the four laser outer diameter measuring instruments 44 are all connected to the central control unit 24.

[0025] Four laser outer diameter measuring instruments 44 are respectively installed on the outlet side of cleaning tank 2, pre-corrosion tank 3, fine corrosion tank 4, and transition corrosion tank 5 to collect the diameter data of fiber optic tube 1 in real time; The four laser outer diameter measuring instruments 44 have a detection accuracy of ±0.001mm and a sampling frequency of 10Hz. The detection data is transmitted to the central control unit 24 in real time via RS485 bus. After the laser outer diameter measuring instrument 44 transmits the data to the central control unit 24, if the diameter deviation exceeds ±2μm, the system immediately adjusts the lifting amount or rotation speed. Online detection avoids the lag of manual timed sampling in existing devices; The measurement at the outlet of cleaning tank 2 provides an initial diameter reference for subsequent corrosion, ensuring the accuracy of corrosion amount in each process, avoiding abrupt changes caused by excessive or insufficient corrosion, and ultimately ensuring that the transition section length and smoothness of each fiber tube 1 meet the standards. In a preferred embodiment, the target value after pre-corrosion of the 280μm fiber optic tube 1 is 260μm, the target value after main corrosion is 215μm, and the target value after transition corrosion is 210μm.

[0026] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A segmented chemical corrosion control process for fiber optic capillaries, characterized in that, Includes the following steps: SS1. Pre-processing and loading: Fix the fiber optic tube (1) to be etched to the bottom of the spindle (20) of the five clamping systems respectively using quick clamps (21). Fill the cleaning tank (2) with 99.5% ethanol cleaning solution and start the ultrasonic cleaning unit with a power of 300W and a frequency of 40kHz. Inject 50% hydrofluoric acid into the pre-corrosion tank (3) and control the temperature to 43°C through the electric heating jacket (25). Inject 60% hydrofluoric acid into the fine corrosion tank (4) and control the temperature to 45°C through the electric heating jacket (25). Inject 45% hydrofluoric acid into the transition corrosion tank (5) and control the temperature to 44°C through the electric heating jacket (25). Start the electric heating jacket (25) of the drying cylinder (8) and the hot air drying device to control the temperature to 60°C and the wind speed to 0.5m / s. SS2, Pretreatment: Transfer the fiber tube (1) to the top of the cleaning tank (2), and use the axial push cylinder (18) to make the fiber tube (1) completely immersed in the cleaning solution. Start the rotation mechanism to drive the spindle (20) to rotate at 10 rpm and the radial vibrator (10) to vibrate radially with an amplitude of 5 μm. Maintain this state for cleaning for 5 min. After cleaning, the fiber optic tube (1) is removed and air-dried. Then, the initial outer diameter data of the fiber optic tube (1) is collected by the laser outer diameter measuring instrument (44) on the outlet side of the cleaning tank (2) and fed back to the central control unit (24). SS3, Pre-corrosion: Transfer the fiber tube (1) to the top of the pre-corrosion tank (3), start the rotation mechanism to make the pre-corrosion tank (3) and the stirring paddle (7) rotate in opposite directions. The stirring paddle (7) rotates at 150 rpm. The fiber tube (1) is immersed to a depth of 6 mm by the axial push cylinder (18). The drive spindle (20) rotates at 10 rpm and the radial vibrator (10) vibrates at an amplitude of 5 μm. Maintain this dynamic parameter for continuous corrosion for 4 min. During the corrosion process, the axial push cylinder (18) drives the axial moving plate (19) to complete a downward 20μm and upward 25μm movement every 1min, and then removes the optical fiber tube (1) after corrosion. SS4, main corrosion treatment: transfer the fiber tube (1) to the top of the fine corrosion tank (4), start the rotation mechanism to make the fine corrosion tank (4) and the stirring paddle (7) rotate in opposite directions at 150 rpm, control the initial immersion depth of the fiber tube (1) to 15 mm by the axial push cylinder (18), drive the mandrel (20) to rotate at 22 rpm and the radial vibrator (10) to vibrate at an amplitude of 25 μm, maintain this state for corrosion for 6 min; During the corrosion process, the axial moving plate (19) completes a downward movement of 60 μm and an upward movement of 52 μm every 0.6 min, and is removed from the optical fiber tube (1) after corrosion. SS5, Transitional corrosion treatment: Transfer the fiber tube (1) to the top of the transition corrosion tank (5), start the rotation mechanism to make the transition corrosion tank (5) and the stirring paddle (7) rotate in opposite directions at 150 rpm, control the initial immersion depth of the fiber tube (1) to 10 mm by the axial push cylinder (18), drive the mandrel (20) to rotate at 15 rpm and the radial vibrator (10) to vibrate at an amplitude of 18 μm, and maintain this state for corrosion for 5 min; During the corrosion process, the axially moving plate (19) completes a downward movement of 15 μm and an upward movement of 18 μm every 0.8 min, and is removed from the optical fiber tube (1) after corrosion. SS6. Post-processing: Transfer the fiber tube (1) to the top of the drying cylinder (8), turn off the rotation of the spindle (20) and the vibration drive of the radial vibrator (10), and use the axial push cylinder (18) to make the fiber enter the drying cylinder (8). Use the fixed scraper (28) at the top of the drying cylinder (8) to scrape off the residual liquid on the surface of the fiber tube (1) and keep it in this state for 5 minutes to dry. After drying, the length and diameter error of the fiber transition section are detected by a laser outer diameter measuring instrument (44) to complete a single corrosion process.

2. A segmented chemical corrosion control device for fiber optic capillary tubes, characterized in that, The fiber capillary segmented chemical corrosion control process described in claim 1 includes a frame (6), on which a rotating cleaning tank (2), a pre-corrosion tank (3), a fine corrosion tank (4) and a transition corrosion tank (5) are sequentially connected in a counterclockwise direction. Each of the cleaning tank (2), the pre-corrosion tank (3), the fine corrosion tank (4) and the transition corrosion tank (5) is provided with a stirring paddle (7) that rotates in the opposite direction to the paddle. A drying cylinder (8) is fixed on the frame (6). It also includes an intermittently rotating slewing frame (9) on which five clamping systems are mounted; The clamping system includes a radial vibrating frame (10) slidably connected to a rotary frame (9), a spring (11) installed between the radial vibrating frame (10) and the rotary frame (9), a follower roller (12) and a rotating sleeve (13) rotatably connected to the radial vibrating frame (10), a synchronous shaft (14) and three coaxially arranged camshafts (15) rotatably connected to the rotary frame (9), each of the three camshafts (15) being driven by a first synchronous belt to the synchronous shaft (14), and an elastic transmission belt (16) drivingly connecting the synchronous shaft (14) and the rotating sleeve (13). Eccentric cams (17) are installed on the camshaft (15). The wheel surfaces of the three eccentric cams (17) are in contact with the follower roller (12). The transmission stroke of the three eccentric cams (17) to the follower roller (12) is different. An axial push cylinder (18) is installed on the rotary frame (9). An axial shift plate (19) is connected to the output end of the axial push cylinder (18). A spindle (20) is rotatably connected to the axial shift plate (19). The spindle (20) rotates synchronously with the sleeve (13). A quick clamp (21) for clamping the optical fiber tube (1) is provided at the bottom end of the spindle (20). It also includes a rotating mechanism, which drives the spindle (20) to rotate at different speeds at the positions corresponding to the pre-corrosion tank (3), the fine corrosion tank (4) and the transition corrosion tank (5), drives the spindle (20) to rotate at the same speed at the positions corresponding to the cleaning tank (2) and the pre-corrosion tank (3), drives the radial vibrator (10) to vibrate horizontally at different vibration strokes at the positions corresponding to the pre-corrosion tank (3), the fine corrosion tank (4) and the transition corrosion tank (5), and drives the radial vibrator (10) to vibrate at the same vibration stroke at the positions corresponding to the cleaning tank (2) and the pre-corrosion tank (3); It also includes an online detection system for measuring the outer diameter of the fiber optic tube (1).

3. The segmented chemical corrosion control device for fiber optic capillaries according to claim 2, characterized in that, A rotary motor (22) is installed on the frame (6). A rotary gear ring (23) is installed on the output shaft of the rotary motor (22) and on the rotary frame (9). The two rotary gear rings (23) mesh with each other. A central control unit (24) is installed on the end face of the frame (6).

4. The segmented chemical corrosion control device for fiber optic capillary tubes according to claim 2, characterized in that, The follower roller (12) is fixedly equipped with driven wheels at the positions corresponding to the three eccentric cams (17). The wheel surfaces of the three driven wheels are in rolling contact with the wheel surfaces of the three eccentric cams (17). The three eccentric cams (17) are provided with a base wheel part and an eccentric protrusion. The three base wheel parts have the same radius and are installed in the same phase on the camshaft (15). The radii of the three eccentric protrusions decrease sequentially from top to bottom and are installed in the same phase on the camshaft (15).

5. The segmented chemical corrosion control device for fiber optic capillary tubes according to claim 2, characterized in that, The elastic transmission belt (16) is made of rubber and provides elastic compensation for the vibration stroke of the radial vibrator (10). The vibration direction of the radial vibrator (10) is perpendicular to the axis of the spindle (20). A square synchronous section is fixedly provided on the spindle (20). A square synchronous groove is provided inside the sleeve (13). The square synchronous groove is slidably connected to the square synchronous section. The cross-sections of the square synchronous groove and the square synchronous section are both regular hexagons.

6. The segmented chemical corrosion control device for fiber optic capillary tubes according to claim 2, characterized in that, The cleaning tank (2), pre-corrosion tank (3), fine corrosion tank (4), transition corrosion tank (5) and drying cylinder (8) are all fitted with electric heating jackets (25). The electric heating jackets (25) are integrated with temperature sensors (26). The data terminals of the temperature sensors (26) are connected to the central control unit (24). The bottom of the cleaning tank (2) is integrated with an ultrasonic cleaning unit. The bottom of the drying cylinder (8) is integrated with a hot air drying device. The cleaning tank (2), pre-corrosion tank (3), fine corrosion tank (4) and transition corrosion tank (5) are all slidably connected with floating scrapers (27). The top of the drying cylinder (8) is fixedly fitted with a fixed scraper (28). The floating scraper (27) and the fixed scraper (28) are both arrayed with slots (30). The floating scraper (27) and the fixed scraper (28) are both equipped with fiber optic scraper sleeves (29). The fiber optic scraper sleeves (29) are lined with hydrofluoric acid resistant silicone.

7. The segmented chemical corrosion control device for fiber optic capillary tubes according to claim 2, characterized in that, The rotating mechanism includes a servo motor (31) mounted on a frame (6) and a forward rotating cylinder (32) and a steering shaft (33) rotatably connected to the frame (6). A reverse rotating shaft (34) is rotatably connected to the forward rotating cylinder (32). A second synchronous belt is driven to the output shaft of the servo motor (31), and the second synchronous belt is driven to the reverse rotating shaft (34). A spur gear ring (36) is mounted on the forward rotating cylinder (32), and a reverse gear ring (35) is mounted on the reverse rotating shaft (34). Each stirring paddle... (7) Each of them is equipped with a lower gear (37) that meshes with the spur gear ring (36). The cleaning tank (2), pre-corrosion tank (3), fine corrosion tank (4) and transition corrosion tank (5) are each equipped with an upper gear (38) that meshes with the reverse gear ring (35). The spur cylinder (32) and the reverse shaft (34) are each equipped with a driven bevel gear. The steering shaft (33) is equipped with a steering bevel gear. Both driven bevel gears are connected to the steering bevel gear in a transmission. The two driven bevel gears are respectively located on both sides of the steering bevel gear.

8. The segmented chemical corrosion control device for fiber optic capillary tubes according to claim 7, characterized in that, The clamping system also includes three rotating gears (39) with different radii, which are fixedly connected to three camshafts (15).

9. The segmented chemical corrosion control device for fiber optic capillary tubes according to claim 8, characterized in that, The rotating mechanism also includes a drive gear ring (40) mounted on the counter-rotating shaft (34). A driven shaft (41) is rotatably connected to the frame (6) at the positions corresponding to the cleaning tank (2), pre-corrosion tank (3), fine corrosion tank (4) and transition corrosion tank (5). A driven gear (42) meshing with the drive gear ring (40) is mounted on each driven shaft (41). A fixed speed gear (43) is mounted on each camshaft (15). Each fixed speed gear (43) meshes with a rotating gear (39) at a corresponding position. The transmission ratio of the driven shaft (41) to the camshaft (15) on the cleaning tank (2) and pre-corrosion tank (3) is 1:

1. The transmission ratio of the driven shaft (41) to the camshaft (15) at the fine corrosion tank (4) is 2.2:

1. The transmission ratio of the driven shaft (41) to the camshaft (15) at the transition corrosion tank (5) is 1.5:

1.

10. The segmented chemical corrosion control device for fiber optic capillaries according to claim 3, characterized in that, The online detection system includes four laser outer diameter measuring instruments (44) installed on the frame (6). The four laser outer diameter measuring instruments (44) correspond to the outlet side of the cleaning tank (2), the pre-corrosion tank (3), the fine corrosion tank (4) and the transition corrosion tank (5). The data output terminals of the four laser outer diameter measuring instruments (44) are all connected to the central control unit (24).

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