Pickling Tank and Pickling Method for Finished Optical Fiber Rod

Abstract

Optical fiber finished product rod pickling pool and pickling method, which relate to the technical field of pickling, and improve the pickling efficiency of optical fiber finished product rods with less acid solution consumption. It includes a pickling pool main body, an acid solution adding pipe and a recovery pool. It is characterized in that an annular pickling tank is arranged inside the upper surface of the pickling pool main body. The pickling tank includes two parallel straight sections and an arc section located between the ends of the two straight sections. A pair of shelf plates for supporting the optical fiber finished product rod are arranged inside the straight section of the pickling tank; an acid solution adding pipe for adding acid solution into the pickling tank is arranged on the pickling pool main body. The acid solution adding pipe is communicated with an acid solution tank. The recovery pool is located at the bottom of the pickling pool main body. An electric control valve is arranged between the pickling tank and the recovery pool. After the electric control valve is opened, the acid solution in the pickling tank flows into the recovery pool. The present invention improves the pickling efficiency with less acid solution consumption by dynamically pickling the optical fiber finished product rod.

Description

Technical Field

[0001] The present invention relates to the technical field of pickling, and more specifically, to a pickling tank for optical fiber finished rods and a pickling method. Background Art

[0002] Optical fiber preforms are raw materials for drawing optical fibers. After preparing a porous body through the VAD process, the porous body is sintered to obtain an optical fiber preform. The surface of the optical fiber preform contains impurities, and it needs to be pickled to remove the impurities to obtain an optical fiber finished rod. The optical fiber finished rod is placed in a drawing furnace and processed through a drawing process to obtain an optical fiber. As Figure 1 shown, it is the structure of the existing pickling tank 1 for optical fiber finished rods. A bracket 11 is placed inside the pickling tank 1. When pickling the optical fiber finished rod 2, the two ends of the optical fiber finished rod 2 are placed on the bracket 11, and then acid solution 3 is added into the pickling tank 1, and left standing for a period of time to achieve pickling of the optical fiber finished rod. After pickling is completed, the acid solution in the pickling tank 1 is pumped out for recycling. The pickling tank with the above structure has a simple structure and is convenient to operate, but has the following two defects: on the one hand, the amount of acid solution added should ensure that the optical fiber finished rod is immersed in the acid solution, so the amount of acid solution used is relatively large; on the other hand, the optical fiber finished rod 2 is statically placed in the pickling tank, and the pickling process is relatively long. Summary of the Invention

[0003] The purpose of the present invention is to provide a pickling tank for optical fiber finished rods and a pickling method, so as to improve the pickling efficiency of optical fiber finished rods with less acid solution usage.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a pickling tank for optical fiber finished rods, including a pickling tank main body, an acid solution adding pipe, and a recovery tank. The upper surface of the pickling tank main body has an annular pickling groove. The pickling groove includes two parallel straight segments and an arc segment located between the ends of the two straight segments. A pair of support plates for supporting the optical fiber finished rod are provided in the straight segments of the pickling groove. The pickling tank main body is provided with an acid solution adding pipe for adding acid solution into the pickling groove. The acid solution adding pipe is communicated with an acid solution tank. The recovery tank is located at the bottom of the pickling tank main body. An electric control valve is provided between the pickling groove and the recovery tank. After the electric control valve is opened, the acid solution in the pickling groove flows into the recovery tank.

[0005] Further, the top of the pickling tank main body has a rectangular enclosing plate. The upper surface of the enclosing plate is higher than the upper surface of the pickling tank main body, and the top of the enclosing plate has a top cover.

[0006] Further, the top of the pickling tank main body has at least one partition plate. The partition plate divides the top of the pickling tank main body into multiple pickling areas, and each pickling area has a pickling groove.

[0007] Further, the support plate is a rectangular plate. The top of the support plate has a groove, and the support plate also has several through holes.

[0008] Further, the bottom of the straight section of the pickling tank is of a conical structure, and the lower end of the bottom of the straight section is connected to the bottom of the arc section.

[0009] Further, the electric control valve is located in the arc section of the pickling tank.

[0010] Further, the acid liquid adding pipe is located at the top of the main body of the pickling tank between the two straight sections of the pickling tank, and the outlet of the acid liquid adding pipe faces the middle of the straight section of the pickling tank.

[0011] Further, the acid liquid adding pipe has two outlets and is horizontally arranged. A support pipe is fixed in the middle of the acid liquid adding pipe. A connecting hose is provided at the lower end of the support pipe. A pump is provided between the connecting hose and the recovery tank. The support pipe is rotatably connected to the main body of the pickling tank. A rotating mechanism for driving the support pipe to rotate in the horizontal plane is provided on the main body of the pickling tank. Under the action of the rotating mechanism, the outlet of the acid liquid adding pipe faces the pickling tank or moves away from above the pickling tank.

[0012] Further, the rotating mechanism includes a worm gear fixedly connected to the support pipe, a motor located on the main body of the pickling tank, and a worm fixed at the output end of the motor. The worm meshes with the worm gear.

[0013] Further, one end of the connecting hose connected to the lower end of the support pipe is spiral.

[0014] The present invention also provides a pickling method for an optical fiber finished rod, including the following steps:

[0015] (1) Place the optical fiber finished rod in the straight section of the pickling tank;

[0016] (2) Add acid liquid into the pickling tank until the acid liquid submerges the optical fiber finished rod;

[0017] (3) Every once in a while, open the electric control valve to transfer a small part of the acid liquid in the pickling tank to the recovery tank;

[0018] (4) Add the acid liquid transferred to the recovery tank in step (3) into the middle of the straight section of the pickling tank through the acid liquid adding pipe;

[0019] (5) After pickling, transfer all the acid liquid in the pickling tank to the recovery tank.

[0020] The beneficial effects of the present invention are as follows: The present invention is provided with a plurality of annular pickling tanks on the pickling tank main body, and the finished optical fiber rods are placed in the pickling tanks. The volume of the pickling tanks is smaller than the volume of the entire pickling tank, so the amount of acid solution used is small. The finished optical fiber rods are pickled in the annular pickling tanks. The acid solution in the pickling tanks is transferred out through the electric control valve and then added back into the pickling tanks, causing the flow of the acid solution in the pickling tanks, thereby realizing dynamic pickling and improving the pickling efficiency. Description of the Drawings

[0021] Figure 1 It is a top view structure diagram of a pickling tank in the prior art;

[0022] Figure 2 It is a top view of the pickling tank of the present invention;

[0023] Figure 3 It is Figure 2 the A-A cross-sectional view in

[0024] Figure 4 It is Figure 2 the B-B cross-sectional view in

[0025] Figure 5 It is a front view of the support plate;

[0026] Figure 6 It is a schematic diagram of the use state of the present invention;

[0027] Figure 7 It is a schematic diagram of the internal structure of the recovery tank;

[0028] Figure 8 It is a main view assembly drawing of the acid solution adding pipe and the rotating mechanism;

[0029] Figure 9 It is a schematic diagram of the pipeline connection of the pickling tank, the acid solution tank and the recovery tank;

[0030] Figure 10 It is a schematic diagram after the acid solution adding pipe rotates 90 degrees;

[0031] Figure 11 It is a schematic diagram of the installation of the support plate on the bottom of the pickling tank;

[0032] In the figure: 1 pickling tank, 11 bracket, 2 optical fiber preform, 3 acid solution, 4 pickling tank main body, 41 enclosing plate, 42 partition plate, 43 pickling tank, 44 tank bottom, 5 electric control valve, 6 support pipe, 61 acid solution adding pipe, 62 connecting hose, 63 bearing, 64 worm gear, 65 pipe sleeve, 66 worm, 67 rotating motor, 7 support plate, 71 through hole, 72 groove, 8 recovery tank, 81 support plate. Embodiment

[0033] As Figure 1As shown in the figure, it is the structure of the pickling tank 1 in the prior art. The pickling tank 1 has a rectangular pickling chamber. A pair of brackets 11 are placed in the pickling chamber of the pickling tank 1. The two ends of the optical fiber preform 2 are placed on the brackets 11. Acid solution 3 is added into the pickling tank 1, and after standing for a period of time, the pickling of the optical fiber preform is completed.

[0034] As Figures 2 to 11 shown in the figure, the pickling tank of the present invention includes a pickling tank main body 1, a shelf plate 7, an acid solution adding pipe 61 and a recovery tank 8. The present invention will be described in detail below with reference to the accompanying drawings.

[0035] As Figures 2 to 11 shown in the figure, the pickling tank for the finished optical fiber rod includes a pickling tank main body 4, an acid solution adding pipe 61 and a recovery tank 8. An annular pickling groove 43 is provided inside the upper surface of the pickling tank main body 4. The pickling groove 43 includes two parallel straight sections and an arc section located between the ends of the two straight sections. A pair of shelf plates 7 for supporting the finished optical fiber rod are provided in the straight section of the pickling groove 43. An acid solution adding pipe 61 for adding acid solution into the pickling groove is provided on the pickling tank main body 4. The acid solution adding pipe 61 is communicated with an acid solution tank. The recovery tank 8 is located at the bottom of the pickling tank main body 4. An electric control valve 5 is provided between the pickling groove 43 and the recovery tank 8. After the electric control valve 5 is opened, the acid solution in the pickling groove 43 flows into the recovery tank 8. The setting of the recovery tank 8 is used for receiving the acid solution flowing out of the pickling groove 43 on the one hand, and as the support base of the pickling tank main body 4 on the other hand. During use, the finished optical fiber rod 2 is placed in the straight section of the pickling groove 43, so that the two ends of the finished optical fiber rod 2 are placed on the shelf plates 7. As Figure 9 shown in the figure, the acid solution in the acid solution tank is added into the pickling groove 43 through a pump until the acid solution submerges the finished optical fiber rod 2 and then pickling is carried out. Every once in a while, the acid solution in the pickling groove 43 is disturbed to make the acid solution flow, and the flow amplitude can be large or small. After the acid solution flows, the acid solution can be stirred, so that the acid solution that has not contacted the finished optical fiber rod 2 approaches the finished optical fiber rod 2 or even contacts the finished optical fiber rod 2, and the acid solution that has pickled the finished optical fiber rod 2 moves away from the finished optical fiber rod 2. On the one hand, the pickling groove 43 has a relatively small volume compared with the whole pickling tank main body 4, which can reduce the amount of acid solution used; on the other hand, through the setting of the annular pickling groove 43, the acid solution in the pickling groove 43 can flow, so as to realize the dynamic pickling of the finished optical fiber rod 2, effectively utilize the acid solution and reduce the waste liquid that has undergone pickling around the finished optical fiber rod 2. Placing the finished optical fiber rods 2 with equal or slightly different outer diameters in the same pickling groove 43 can also reduce the relative amount of acid solution used.

[0036] As Figure 2 、 Figure 3 shown in the figure, the top of the pickling tank main body 4 has a rectangular surrounding plate 41. The upper surface of the surrounding plate 41 is higher than the upper surface of the pickling tank main body 4. The top of the surrounding plate 41 is used to set a top cover to cover the pickling groove 43 on the upper surface of the pickling tank main body 4.

[0037] As Figure 3 shown, at least one partition plate 42 is provided at the top of the pickling tank main body 4. The partition plate 42 divides the top of the pickling tank main body 4 into multiple pickling areas, and each pickling area is provided with a pickling tank 43.

[0038] As Figures 3 to 5 shown, the rack plate 7 is a rectangular plate. A groove 72 is provided at the top of the rack plate 7, and a plurality of through holes 71 are also provided on the rack plate 7. The arrangement of the through holes 71 facilitates the acid solution to pass through the rack plate. The bottom of the groove 72 is arc-shaped. The arrangement of the groove 72 is used to limit the finished optical fiber rod 2 to prevent the finished optical fiber rod 2 from rolling radially.

[0039] As Figure 11 shown, the bottom 44 of the straight section of the pickling tank 43 is a conical structure, and the lower end of the bottom 44 of the straight section is connected to the bottom of the arc section. The bottom of the straight section of the pickling tank 43 is a conical structure with both ends low and the middle high, which is beneficial to the acid solution flowing towards the position where the electric control valve is located under the action of gravity when the electric control valve is opened, and then emptying the acid solution in the pickling tank when pickling is completed. As Figure 2 shown, the electric control valve 5 is located in the arc section of the pickling tank 43, and the bottom of the arc section is the lowest point of the bottom of the pickling tank. As Figure 9 shown, in this way, the acid solution flows towards the arc section of the pickling tank 43 under the action of gravity, and then flows into the recovery tank through the electric control valve 5.

[0040] As Figure 2 、 Figure 6 shown, the acid solution adding pipe 61 is located at the top of the pickling tank main body 4 between the two straight sections of the pickling tank 43, and the outlet of the acid solution adding pipe 61 faces the middle of the straight section of the pickling tank 43. The point where the acid solution is discharged from the pickling tank 43 is located in the arc section, while the point where the acid solution is added to the pickling tank 43 is located in the middle of the straight section. In this way, it is easy to cause the flow of the acid solution in the pickling tank 43, and then facilitate the stirring of the acid solution to realize dynamic pickling.

[0041] As Figure 2 、 Figure 6 shown, the acid solution adding pipe 61 has two outlets and is horizontally arranged. As Figure 8As shown, a support pipe 6 is fixed in the middle of the acid liquid adding pipe 61, such that the support pipe 6 and the acid liquid adding pipe 61 form a "T" - shaped structure. The lower end of the support pipe 6 has a connecting hose 62, and there is a pump between the connecting hose 62 and the recovery tank 8. The support pipe 6 is rotatably connected to the pickling tank main body 4 through a bearing 63. There is a rotating mechanism on the pickling tank main body 4 for driving the support pipe 6 to rotate in the horizontal plane. Under the action of the rotating mechanism, the outlet of the acid liquid adding pipe 61 faces the pickling tank 43 or moves away from above the pickling tank 43. The rotating mechanism includes a worm gear 64 fixedly connected to the support pipe 6, a motor 67 located on the pickling tank main body 4, and a worm 66 fixed to the output end of the motor 67. The worm 66 meshes with the worm gear 64. To facilitate the assembly of the worm gear 64 and the support pipe 6, a sleeve 65 is provided on the outer wall of the support pipe 6. The inner wall of the sleeve 65 is fixedly connected to the support pipe 6, and the outer wall of the sleeve 65 is fixedly connected to the worm gear 64. As Figure 6 shown, before adding acid liquid, the acid liquid adding pipe 61 is parallel to the straight section of the pickling tank. As Figure 10 shown, when adding acid liquid, the motor drives the support pipe 6 to rotate 90 degrees. At this time, the outlet of the acid liquid adding pipe 61 faces the pickling tank 43 and is located above the pickling tank 43, and the acid liquid is added to the middle of the straight section of the pickling tank 43. After the acid liquid addition is completed, the motor 67 drives the acid liquid adding pipe 61 to reset. One end of the connecting hose 42 connected to the lower end of the support pipe 6 is spiral to meet the rotation requirement when the support pipe 6 rotates.

[0042] To ensure the structural strength of the recovery tank 8, as Figure 7 shown, multiple support plates 81 are arranged in the recovery tank 8 to ensure the structural strength of the recovery tank 8 and the supporting strength for the pickling tank main body 4.

[0043] The present invention also provides a pickling method for an optical fiber finished rod, including the following steps:

[0044] (1) Place the optical fiber finished rod in the straight section of the pickling tank;

[0045] (2) As Figure 9 shown, add the acid liquid in the acid liquid tank to the pickling tank until the acid liquid submerges the optical fiber finished rod;

[0046] (3) Every once in a while, open the electric control valve to transfer a small part of the acid liquid in the pickling tank to the recovery tank;

[0047] (4) Add the acid liquid transferred to the recovery tank in step (3) to the middle of the straight section of the pickling tank through the acid liquid adding pipe;

[0048] (5) After pickling is completed, transfer all the acid liquid in the pickling tank to the recovery tank.

[0049] The present invention provides a plurality of annular pickling tanks on the main body of the pickling tank. The finished optical fiber rods are placed in the pickling tanks. The volume of the pickling tanks is smaller than the volume of the entire pickling tank, so the amount of acid solution used is small. The finished optical fiber rods are pickled in the annular pickling tanks. The acid solution in the pickling tanks is transferred out through an electrically controlled valve and then added back into the pickling tanks, causing the flow of the acid solution in the pickling tanks, thereby realizing dynamic pickling and improving the pickling efficiency.

Claims

1. Optical fiber finished product rod pickling tank, comprising a pickling tank main body, an acid solution addition pipe, and a recovery tank, characterized in that, The upper surface of the pickling tank main body has an annular pickling tank, which includes two parallel straight sections and an arc section located between the ends of the two straight sections. A pair of support plates for supporting the finished optical fiber rod are provided in the straight section of the pickling tank; an acid liquid adding pipe for adding acid liquid into the pickling tank is provided on the pickling tank main body, and the acid liquid adding pipe is communicated with an acid liquid tank. The recovery tank is located at the bottom of the pickling tank main body. An electric control valve is provided between the pickling tank and the recovery tank. After the electric control valve is opened, the acid liquid in the pickling tank flows into the recovery tank; at least one partition plate is provided at the top of the pickling tank main body, and the partition plate divides the top of the pickling tank main body into multiple pickling areas, and each pickling area has a pickling tank; the support plate is a rectangular plate, and the top of the support plate has a groove, and a number of through holes are also provided on the support plate; the acid liquid adding pipe has two outlets and is horizontally arranged. A support pipe is fixed in the middle of the acid liquid adding pipe. A connecting hose is provided at the lower end of the support pipe. A pump is provided between the connecting hose and the recovery tank. The support pipe is rotatably connected to the pickling tank main body. A rotating mechanism for driving the support pipe to rotate in the horizontal plane is provided on the pickling tank main body. Under the action of the rotating mechanism, the outlet of the acid liquid adding pipe faces the pickling tank or moves away from above the pickling tank; the rotating mechanism includes a worm gear fixedly connected to the support pipe, a motor located on the pickling tank main body, and a worm fixed at the output end of the motor. The worm is meshed with the worm gear; the electric control valve is located in the arc section of the pickling tank; the acid liquid adding pipe is located at the top of the pickling tank main body between the two straight sections of the pickling tank, and the outlet of the acid liquid adding pipe faces the middle of the straight section of the pickling tank.

2. The pickling bath for the finished optical fiber rod according to claim 1, wherein The top of the pickling tank main body has a rectangular enclosing plate, and the upper surface of the enclosing plate is higher than the upper surface of the pickling tank main body. A top cover is provided on the top of the enclosing plate.

3. The pickling bath for the finished optical fiber rod according to claim 1, characterized in that, The bottom of the straight section of the pickling tank is a conical structure, and the lower end of the bottom of the straight section is connected to the bottom of the arc section.

4. The pickling method of the pickling tank for the finished optical fiber rod according to any one of claims 1 to 3, characterized in that It includes the following steps: (1) Place the finished optical fiber rod in the straight section of the pickling tank; (2) Add acid liquid into the pickling tank until the acid liquid covers the finished optical fiber rod; (3) Every once in a while, open the electric control valve to transfer a small part of the acid liquid in the pickling tank to the recovery tank; (4) Add the acid liquid transferred to the recovery tank in step (3) to the middle of the straight section of the pickling tank through the acid liquid adding pipe; (5) After pickling is completed, transfer all the acid liquid in the pickling tank to the recovery tank.

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