Panda type polarization maintaining optical fiber preform cleaning device and method

Abstract

The invention provides a panda type polarization maintaining optical fiber preform cleaning device and method, and belongs to the technical field of optical fiber preparation. The panda type polarization maintaining optical fiber preform cleaning device comprises a cleaning chamber and a cleaning system. A cleaning opening is formed in the cleaning chamber; the bottom of the preform is fixed at the cleaning opening; the cleaning system is connected with the cleaning port; and the cleaning system is used for filling cleaning liquid into the cleaning hole from the bottom of the preform through the cleaning opening. According to the panda type polarization maintaining optical fiber preform cleaning device and the cleaning system provided by the invention, the cleaning liquid is filled into the inner hole of the preform through the cleaning opening in the bottom of the preform, and the cleaning liquid overflows from the top after the inner hole of the preform is filled with the cleaning liquid, so that the inner hole of the preform is filled with the cleaning liquid, and the inner hole of the preform is fully cleaned.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber preparation, and more specifically, relates to a panda-type polarization-maintaining optical fiber preform cleaning device and method. Background Art

[0002] Panda-type polarization-maintaining optical fiber plays an important role in laser processing, optical sensing, optical communications and other fields. At present, the rod insertion method is the most widely used in the preparation of panda-type polarization-maintaining optical fiber preforms, that is, two holes are symmetrically punched near the core and cladding on the single-mode preform, and then the pre-polished boron rods are inserted into the holes to form the final optical fiber preform. In order to ensure the final optical performance and strength of the optical fiber, before the polished boron rods are inserted into the inner hole of the single-mode preform, both need to be thoroughly cleaned to remove metals and impurities introduced during the processing. The existing quartz and glass cleaning technology is mainly aimed at cylindrical, tubular shapes with smooth surfaces, and is carried out in a tube cleaning machine, which is not suitable for cleaning the inner hole of single-mode preforms. Summary of the invention

[0003] The object of the present invention is to provide a panda-type polarization-maintaining optical fiber preform cleaning device, aiming to solve the problem of incomplete cleaning of the inner hole of the existing optical fiber.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a panda-type polarization-maintaining optical fiber preform cleaning device and method.

[0005] In a first aspect, the present invention provides a panda-type polarization-maintaining optical fiber preform cleaning device, comprising:

[0006] A cleaning chamber is provided with a cleaning port inside; the bottom of the preform rod to be cleaned is fixed at the cleaning port; and

[0007] A cleaning system is connected to the cleaning port; the cleaning system fills cleaning liquid into the inner hole of the preform rod from the bottom of the preform rod through the cleaning port.

[0008] In a possible implementation, two cleaning ports are provided, the distance between the two cleaning ports is equal to the distance between the two inner holes on the preform rod, and the preform rod is fixed at the cleaning ports.

[0009] In a possible implementation, the cleaning system includes:

[0010] a storage chamber for storing cleaning fluid; and

[0011] A liquid supply pipeline connects the storage chamber and the cleaning port, and is used to fill the inner hole of the preform rod with the cleaning liquid in the storage chamber through the cleaning port.

[0012] In a possible implementation, a discharge port is provided at the bottom of the cleaning chamber; the cleaning chamber is higher than the storage chamber, and the cleaning system further includes a discharge pipe; the discharge pipe connects the discharge port and the storage chamber, and is used to recover the cleaning liquid in the cleaning chamber into the storage chamber.

[0013] In a possible implementation, the cleaning system further includes:

[0014] a motor, disposed inside the storage chamber and connected to the liquid supply pipe, so as to fill the inner hole of the preform rod with the cleaning liquid in the storage chamber through the liquid supply pipe and the cleaning port; and

[0015] A flow valve is arranged on the liquid supply pipeline and is used to control the flow inside the liquid supply pipeline.

[0016] In one possible implementation,

[0017] The cleaning system (2) further comprises:

[0018] A detection unit, used to detect the length of the inner hole of the preform rod and output the information of the length of the inner hole of the preform rod; and

[0019] The controller is connected to the detection unit for communication, receives and controls the motor (23) and the flow valve (24) to operate according to the preform rod inner hole length information, so as to adjust the flow in the liquid supply pipeline (22).

[0020] In a possible implementation, a slot for fixing the preform rod is provided at the bottom of the cleaning chamber, and the cleaning port is arranged in the slot.

[0021] In a second aspect, the present invention provides a method for cleaning a panda-type polarization-maintaining optical fiber preform, comprising the following steps:

[0022] Fixing the preform rod to a designated position;

[0023] Filling the bottom of the preform with a cleaning liquid to flush the inner hole of the preform; and

[0024] The length information of the inner hole of the preform rod is obtained, and the flow rate of the cleaning liquid is adjusted according to the length information of the inner hole of the preform rod.

[0025] In a possible implementation, adjusting the flow rate of the cleaning liquid according to the preform inner hole length information includes:

[0026] The preform inner hole length information is compared with the length threshold, and the corresponding cleaning liquid flow rate is selected according to the comparison result.

[0027] In a possible implementation, the cleaning fluid flow rate is 1m3 / h-4m 3 / h.

[0028] The beneficial effect of the panda-type polarization-maintaining optical fiber preform cleaning device provided by the present invention is that: compared with the prior art, the cleaning system of the panda-type polarization-maintaining optical fiber preform cleaning device of the present invention fills the cleaning liquid into the inner hole of the preform through the cleaning port at the bottom of the preform, and after the cleaning liquid fills the inner hole of the preform, it overflows from the top, so that the inner hole of the preform is filled with the cleaning liquid, and the inner hole of the preform is fully cleaned.

[0029] The beneficial effect of the panda-type polarization-maintaining optical fiber preform cleaning method provided by the present invention is that: compared with the prior art, the panda-type polarization-maintaining optical fiber preform cleaning method of the present invention can adjust the flow rate of the cleaning liquid during the cleaning process according to the length of the inner hole of the preform, thereby ensuring that the cleaning liquid in the inner hole of the preform has sufficient flow rate and flow velocity to flush the inner wall of the inner hole of the preform, thereby fully cleaning the inner hole of the preform. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0031] Figure 1 A schematic structural diagram of a panda-type polarization-maintaining optical fiber preform cleaning device provided in an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the main steps of a method for cleaning a panda-type polarization-maintaining optical fiber preform provided in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Cleaning chamber; 11. Cleaning port; 12. Discharge port; 2. Cleaning system; 21. Storage chamber; 22. Liquid supply pipeline; 23. Motor; 24. Flow valve; 25. Discharge pipeline. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] Reference Figure 1 and Figure 2 Now, the panda-type polarization-maintaining optical fiber preform cleaning device and method provided by the present invention are described.

[0037] Reference Figure 1 In a first aspect, this embodiment provides a panda-type polarization-maintaining optical fiber preform cleaning device.

[0038] Example 1

[0039] The panda-type polarization-maintaining optical fiber preform cleaning device comprises a cleaning chamber 1 and a cleaning system 2 connected to the cleaning chamber 1. A cleaning port 11 is provided at the bottom of the cleaning chamber 1, the bottom of the preform is fixed at the cleaning port 11, and the cleaning port 11 is communicated with the inner hole of the preform. The cleaning system 2 is connected to the cleaning port 11, and the cleaning system 2 delivers the cleaning liquid into the inner hole of the preform through the cleaning port 11. The cleaning liquid enters the inner hole of the preform from the bottom of the preform, and when the inner hole is filled with the cleaning liquid, the cleaning liquid overflows from the top of the preform, thereby fully cleaning the inner wall of the inner hole of the preform.

[0040] Compared with the prior art, the panda-type polarization-maintaining optical fiber preform cleaning device provided by the present invention allows water to enter the bottom of the inner hole of the preform, and when the inner hole of the preform is filled with cleaning liquid, the cleaning liquid overflows from the top of the inner hole of the preform. In this process, the cleaning liquid continuously flushes the inner wall of the inner hole of the preform, thereby fully cleaning the inner hole of the preform, flushing away the metal and impurities on the inner wall of the inner hole of the preform, and thus fully flushing the inner hole of the preform.

[0041] Optionally, there are two cleaning ports 11, the two cleaning ports 11 correspond to the two inner holes of the preform, the spacing between the two cleaning ports 11 is equal to the spacing between the two inner holes of the preform, and the diameter of the cleaning port 11 is equal to the aperture of the inner hole of the preform. The cleaning port 11 is arranged at the bottom of the cleaning chamber 1 and protrudes upward, the cleaning port 11 is hollow, and the outer side shape of the cleaning port 11 is adapted to the shape of the inner hole of the preform. When the preform is fixed, the cleaning port 11 is inserted into the inner hole of the preform, and the outer side wall of the cleaning port 11 is tightly fitted with the inner side wall of the preform. When the cleaning system 2 supplies cleaning liquid to the inner hole of the preform through the cleaning port 11, the cleaning liquid rises along the inner hole of the preform and cannot seep out from the gap between the flushing port and the inner wall of the inner hole of the preform. When the inner hole of the preform is filled with cleaning liquid, the cleaning liquid overflows from the top of the inner hole of the preform.

[0042] Optionally, the cleaning system 2 includes a storage chamber 21 for storing cleaning liquid and a liquid supply pipe 22. One end of the liquid supply pipe 22 is connected to the cleaning port 11, and the other end is connected to the storage chamber 21. The liquid supply pipe 22 is used to supply the cleaning liquid in the storage chamber 21 to the cleaning port 11, so as to clean the inner hole of the preform.

[0043] Optionally, the cleaning chamber 1 is arranged higher than the storage chamber 21, and a discharge port 12 is arranged at the bottom of the cleaning chamber 1. The cleaning system 2 further includes a discharge pipe 25. One end of the discharge pipe 25 is connected to the discharge port 12 at the bottom of the cleaning chamber 1, and the other end is arranged in the storage chamber 21. After the cleaning liquid overflows from the top of the inner hole of the preform, it falls into the cleaning chamber 1, and then is recovered from the discharge port 12 through the discharge pipe 25 to the storage chamber 21, so as to be supplied to the cleaning chamber 1 for cleaning.

[0044] Optionally, the cleaning system 2 further comprises a motor 23 disposed in the storage chamber 21 and a flow valve 24 disposed on the liquid supply pipe 22. The motor 23 is connected to the liquid supply pipe 22. The motor 23 is used to provide power for the liquid supply pipe 22 to supply cleaning liquid to the flushing port. The flow valve 24 is used to control the flow of the cleaning liquid in the liquid supply pipe 22.

[0045] Optionally, the flow rate of the cleaning liquid in the liquid supply pipe 22 is 1m 3 / h-4m 3 / h.

[0046] Optionally, a slot for fixing the preform is provided at the bottom of the cleaning chamber 1, and the cleaning port 11 is arranged in the slot. When fixing the preform during the cleaning process, the preform is vertically inserted into the slot for clamping and fixing, and the cleaning port 11 is inserted into the inner hole of the preform.

[0047] Example 2

[0048] The present embodiment provides a cleaning device for a panda-type polarization-maintaining optical fiber preform, which includes a cleaning chamber 1 and a cleaning system 2 connected to the cleaning chamber 1. A cleaning port 11 is provided at the bottom of the cleaning chamber 1, and the bottom of the preform is fixed at the cleaning port 11, and the cleaning port 11 is communicated with the inner hole of the preform. The cleaning system 2 is connected to the cleaning port 11, and the cleaning system 2 delivers a cleaning liquid into the inner hole of the preform through the cleaning port 11. The cleaning liquid enters the inner hole of the preform from the bottom of the preform, and when the inner hole is filled with the cleaning liquid, the cleaning liquid overflows from the top of the preform, thereby fully cleaning the inner wall of the inner hole of the preform.

[0049] Compared with the prior art, the panda-type polarization-maintaining optical fiber preform cleaning device provided by the present invention allows water to enter the bottom of the inner hole of the preform, and when the inner hole of the preform is filled with cleaning liquid, the cleaning liquid overflows from the top of the inner hole of the preform. In this process, the cleaning liquid continuously flushes the inner wall of the inner hole of the preform, thereby fully cleaning the inner hole of the preform, flushing away the metal and impurities on the inner wall of the inner hole of the preform, and thus fully flushing the inner hole of the preform.

[0050] Optionally, there are two cleaning ports 11, the two cleaning ports 11 correspond to the two inner holes of the preform, the spacing between the two cleaning ports 11 is equal to the spacing between the two inner holes of the preform, and the diameter of the cleaning port 11 is equal to the aperture of the inner hole of the preform. The cleaning port 11 is arranged at the bottom of the cleaning chamber 1 and protrudes upward, the cleaning port 11 is hollow, and the outer side shape of the cleaning port 11 is adapted to the shape of the inner hole of the preform. When the preform is fixed, the cleaning port 11 is inserted into the inner hole of the preform, and the outer side wall of the cleaning port 11 is tightly fitted with the inner side wall of the preform. When the cleaning system 2 supplies cleaning liquid to the inner hole of the preform through the cleaning port 11, the cleaning liquid rises along the inner hole of the preform and cannot seep out from the gap between the flushing port and the inner wall of the inner hole of the preform. When the inner hole of the preform is filled with cleaning liquid, the cleaning liquid overflows from the top of the inner hole of the preform.

[0051] Optionally, the cleaning system 2 includes a storage chamber 21 for storing cleaning liquid and a liquid supply pipe 22. One end of the liquid supply pipe 22 is connected to the cleaning port 11, and the other end is connected to the storage chamber 21. The liquid supply pipe 22 is used to supply the cleaning liquid in the storage chamber 21 to the cleaning port 11, so as to clean the inner hole of the preform.

[0052] Optionally, the cleaning chamber 1 is arranged higher than the storage chamber 21, and a discharge port 12 is arranged at the bottom of the cleaning chamber 1. The cleaning system 2 further includes a discharge pipe 25. One end of the discharge pipe 25 is connected to the discharge port 12 at the bottom of the cleaning chamber 1, and the other end is arranged in the storage chamber 21. After the cleaning liquid overflows from the top of the inner hole of the preform, it falls into the cleaning chamber 1, and then is recovered from the discharge port 12 through the discharge pipe 25 to the storage chamber 21, so as to be supplied to the cleaning chamber 1 for cleaning.

[0053] Optionally, the cleaning system 2 further comprises a motor 23 disposed in the storage chamber 21 and a flow valve 24 disposed on the liquid supply pipe 22. The motor 23 is connected to the liquid supply pipe 22. The motor 23 is used to provide power for the liquid supply pipe 22 to supply cleaning liquid to the flushing port. The flow valve 24 is used to control the flow of the cleaning liquid in the liquid supply pipe 22.

[0054] Optionally, the flow rate of the cleaning liquid in the liquid supply pipe 22 is 1m 3 / h-4m 3 / h.

[0055] Optionally, a slot for fixing the preform is provided at the bottom of the cleaning chamber 1, and the cleaning port 11 is arranged in the slot. When fixing the preform during the cleaning process, the preform is vertically inserted into the slot for clamping and fixing, and the cleaning port 11 is inserted into the inner hole of the preform.

[0056] In a preferred embodiment, the panda-type polarization-maintaining optical fiber preform cleaning device provided in this embodiment further includes a detection unit for detecting the length of the inner hole of the preform and a controller connected in communication with the flow valve 24. The flow valve 24 is connected in communication with the controller, and can provide real-time feedback on the flow information in the liquid supply pipeline 22. The detection unit is connected in communication with the controller, and sends the detected information on the length of the inner hole of the preform to the controller. After receiving the information on the length of the preform, the controller controls the operation of the motor 23 and the flow valve 24 according to the information and the flow information in the liquid supply pipeline 22, so as to adjust the flow in the liquid supply pipeline 22.

[0057] The detection unit may be a distance sensor disposed at the top of the cleaning chamber 1. The distance sensor is disposed just above the physical part of the preform. Since the inner hole of the preform is a through hole, the length of the inner hole of the preform can be obtained by determining the length of the preform. After detecting the distance between the top of the preform and the top of the cleaning chamber 1, the length of the preform can be obtained by subtracting the distance between the top of the preform and the top of the cleaning chamber 1 from the height of the cleaning chamber 1, thereby obtaining the information on the length of the inner hole of the preform.

[0058] After receiving the preform inner hole length information, the controller compares the information with the length threshold and determines the flow rate in the liquid supply pipeline 22. The length threshold includes a first length threshold and a second length threshold. If the preform inner hole length information is lower than the first length threshold, the first flow rate instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the first flow rate. If the preform inner hole length information is higher than the first length threshold and lower than the second flow rate threshold, the second flow rate instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the second flow rate. If the preform inner hole length information is higher than the second length threshold, the third flow rate instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the third flow rate.

[0059] In a preferred embodiment, the panda-type polarization-maintaining optical fiber preform cleaning device provided in this embodiment further includes a detection unit for detecting the length of the inner hole of the preform and a controller connected in communication with the flow valve 24. The flow valve 24 is connected in communication with the controller, and can provide real-time feedback on the flow information in the liquid supply pipeline 22. The detection unit is connected in communication with the controller, and sends the detected information on the length of the inner hole of the preform to the controller. After receiving the information on the length of the preform, the controller controls the operation of the motor 23 and the flow valve 24 according to the information and the flow information in the liquid supply pipeline 22, so as to adjust the flow in the liquid supply pipeline 22.

[0060] After receiving the preform inner hole length information, the controller compares the information with the length threshold and determines the flow rate in the liquid supply pipeline 22. The length threshold includes a first length threshold, a second length threshold and a third length threshold. If the preform inner hole length information is lower than the first length threshold, the first flow rate instruction is output, the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the first flow rate. If the preform inner hole length information is higher than the first length threshold and lower than the second flow rate threshold, the second flow rate instruction is output, the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the second flow rate. If the preform inner hole length information is higher than the second length threshold and lower than the third length threshold, the third flow rate instruction is output, the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the third flow rate. If the preform inner hole length information is higher than the third length threshold, the fourth flow rate instruction is output, the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the fourth flow rate.

[0061] In a preferred embodiment, the panda-type polarization-maintaining optical fiber preform cleaning device provided in this embodiment further includes a detection unit for detecting the length of the inner hole of the preform and a controller connected in communication with the flow valve 24. The flow valve 24 is connected in communication with the controller, and can provide real-time feedback on the flow information in the liquid supply pipeline 22. The detection unit is connected in communication with the controller, and sends the detected information on the length of the inner hole of the preform to the controller. After receiving the information on the length of the preform, the controller controls the operation of the motor 23 and the flow valve 24 according to the information and the flow information in the liquid supply pipeline 22, so as to adjust the flow in the liquid supply pipeline 22.

[0062] After receiving the preform inner hole length information, the controller compares the information with the length threshold and determines the flow rate in the liquid supply pipeline 22. The length threshold includes a first length threshold, a second length threshold and a third length threshold. If the preform inner hole length information is lower than the first length threshold, the first flow rate instruction is output, the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the first flow rate. If the preform inner hole length information is higher than the first length threshold and lower than the second flow rate threshold, the second flow rate instruction is output, the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the second flow rate. If the preform inner hole length information is higher than the second length threshold and lower than the third length threshold, the third flow rate instruction is output, the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the third flow rate. If the preform inner hole length information is higher than the third length threshold, the fourth flow rate instruction is output, the motor 23 and the flow valve 24 are adjusted to work, so that the flow rate in the liquid supply pipeline 22 is stabilized at the fourth flow rate.

[0063] Reference Figure 2In a second aspect, the present embodiment provides a method for cleaning a panda-type polarization-maintaining optical fiber preform, which is applied to the panda-type polarization-maintaining optical fiber preform cleaning device as described in the first aspect.

[0064] A method for cleaning a panda-type polarization-maintaining optical fiber preform comprises the following steps:

[0065] S1. Fix the preform rod to a designated position so that one end of the preform rod is higher than the other end.

[0066] S2. Fill the bottom of the preform with cleaning liquid to rinse the inner hole of the preform.

[0067] S3. Obtain the inner hole length information of the preform rod, and adjust the flow rate of the cleaning liquid according to the inner hole length information of the preform rod.

[0068] Optionally, in step S3, adjusting the flow rate of the cleaning liquid according to the inner hole length information of the preform rod includes:

[0069] The preform inner hole length information is compared with the length threshold, and the corresponding cleaning liquid flow rate is selected according to the comparison result.

[0070] Optionally, the cleaning liquid flow rate in step S3 is 1m 3 / h-4m 3 / h.

[0071] In a preferred embodiment, the panda-type polarization-maintaining optical fiber preform cleaning method provided in this embodiment is applied to the panda-type polarization-maintaining optical fiber preform cleaning device as described in the first aspect, and the method comprises the following steps:

[0072] S1. Fix the preform rod to a designated position so that one end of the preform rod is higher than the other end.

[0073] S2. Fill the bottom of the preform with cleaning liquid to rinse the inner hole of the preform.

[0074] S3. Obtain the inner hole length information of the preform rod, and adjust the flow rate of the cleaning liquid according to the inner hole length information of the preform rod.

[0075] In step S3, the length information of the inner hole of the preform is obtained by the detection unit. The detection unit may be a distance sensor disposed at the top of the cleaning chamber 1. The distance sensor is disposed just above the solid part of the preform. Since the inner hole of the preform is a through hole, the length of the inner hole of the preform can be obtained by determining the length of the preform. After detecting the distance between the top of the preform and the top of the cleaning chamber 1, the length of the preform can be obtained by subtracting the distance between the top of the preform and the top of the cleaning chamber 1 from the height of the cleaning chamber 1, thereby obtaining the length information of the inner hole of the preform.

[0076] The length threshold includes a first length threshold and a second length threshold. If the preform inner hole length information is lower than the first length threshold, a first flow instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow in the liquid supply pipeline 22 is stabilized at the first flow. If the preform inner hole length information is higher than the first length threshold and lower than the second flow threshold, a second flow instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow in the liquid supply pipeline 22 is stabilized at the second flow. If the preform inner hole length information is higher than the second length threshold, a third flow instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow in the liquid supply pipeline 22 is stabilized at the third flow.

[0077] In a preferred embodiment, the length threshold includes a first length threshold, a second length threshold and a third length threshold. If the preform inner hole length information is lower than the first length threshold, a first flow instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow in the liquid supply pipe 22 is stabilized at the first flow. If the preform inner hole length information is higher than the first length threshold and lower than the second flow threshold, a second flow instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow in the liquid supply pipe 22 is stabilized at the second flow. If the preform inner hole length information is higher than the second length threshold and lower than the third length threshold, a third flow instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow in the liquid supply pipe 22 is stabilized at the third flow. If the preform inner hole length information is higher than the third length threshold, a fourth flow instruction is output, and the motor 23 and the flow valve 24 are adjusted to work, so that the flow in the liquid supply pipe 22 is stabilized at the fourth flow.

[0078] In a preferred embodiment, in step S3, the flow rate of the cleaning liquid is adjusted according to the inner hole length information of the preform rod. Specifically, if the inner hole length information of the preform rod is less than 200 mm, the flow rate of the cleaning liquid is controlled to be 1 m 3 / h; if the preform length is higher than 200mm and lower than 300mm, the cleaning liquid flow rate is controlled to 2m 3 / h; if the length of the preform is higher than 300mm and lower than 400mm, the cleaning liquid flow rate is controlled to 3m3 / h; if the length of the preform is higher than 400mm and lower than 500mm, the cleaning liquid flow rate is controlled to 4m 3 / h.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A panda-type polarization-maintaining optical fiber preform cleaning device, characterized in that: include: A cleaning chamber (1) having a cleaning port (11) disposed therein; The bottom of the preform rod to be cleaned is fixed to the cleaning port (11); and A cleaning system (2) is connected to the cleaning port (11); the cleaning system (2) fills the cleaning liquid into the inner hole of the preform rod from the bottom of the preform rod through the cleaning port (11).

2. The panda-type polarization-maintaining optical fiber preform cleaning device according to claim 1, characterized in that: Two cleaning ports (11) are provided, the distance between the two cleaning ports (11) is equal to the distance between the two inner holes on the preform rod, and the preform rod is fixed at the cleaning ports (11).

3. The panda-type polarization-maintaining optical fiber preform cleaning device according to claim 1, characterized in that: The cleaning system (2) comprises: A storage chamber (21) for storing cleaning liquid; and A liquid supply pipe (22) connects the storage chamber (21) and the cleaning port (11) and is used to fill the inner hole of the preform rod with the cleaning liquid in the storage chamber (21) through the cleaning port (11).

4. The panda-type polarization-maintaining optical fiber preform cleaning device according to claim 3, characterized in that: The bottom of the cleaning chamber (1) is provided with a discharge port (12); the cleaning chamber (1) is higher than the storage chamber (21); the cleaning system (2) further comprises a discharge pipe (25); the discharge pipe (25) connects the discharge port (12) and the storage chamber (21) and is used to recover the cleaning liquid in the cleaning chamber (1) to the storage chamber (21).

5. The panda-type polarization-maintaining optical fiber preform cleaning device according to claim 3, characterized in that: The cleaning system (2) further comprises: a motor (23) disposed inside the storage chamber (21) and connected to the liquid supply pipe (22) so as to fill the inner hole of the preform rod with the cleaning liquid in the storage chamber (21) through the liquid supply pipe (22) and the cleaning port (11); and A flow valve (24) is arranged on the liquid supply pipeline (22) and is used to control the flow inside the liquid supply pipeline (22).

6. The panda-type polarization-maintaining optical fiber preform cleaning device according to claim 5, characterized in that: The cleaning system (2) further comprises: A detection unit, used to detect the length of the inner hole of the preform rod and output the information of the length of the inner hole of the preform rod; and The controller is connected to the detection unit for communication, receives and controls the motor (23) and the flow valve (24) to operate according to the preform rod inner hole length information, so as to adjust the flow in the liquid supply pipeline (22).

7. The panda-type polarization-maintaining optical fiber preform cleaning device according to claim 1, characterized in that: The bottom of the cleaning chamber (1) is provided with a slot for fixing the preform rod, and the cleaning port (11) is arranged in the slot.

8. A method for cleaning a panda-type polarization-maintaining optical fiber preform, characterized in that: The following steps are involved: Fixing the preform rod to a designated position; Filling the bottom of the preform with a cleaning liquid to flush the inner hole of the preform; and The length information of the inner hole of the preform rod is obtained, and the flow rate of the cleaning liquid is adjusted according to the length information of the inner hole of the preform rod.

9. The method for cleaning the panda-type polarization-maintaining optical fiber preform according to claim 8, characterized in that: Adjusting the flow rate of the cleaning liquid according to the inner hole length information of the preform rod includes: The preform inner hole length information is compared with the length threshold, and the corresponding cleaning liquid flow rate is selected according to the comparison result.

10. The method for cleaning the panda-type polarization-maintaining optical fiber preform according to claim 8, characterized in that: The cleaning liquid flow rate is 1m 3 / h-4m 3 / h.

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