Sleeve assembly, optical transmission system and processing method

Abstract

The invention belongs to the technical field of optical transmission, and particularly relates to a sleeve assembly, an optical transmission system and a machining method. The sleeve assembly comprises a first sleeve which comprises a carbon fiber inner cylinder and a metal outer cylinder, and the metal outer cylinder is arranged outside the carbon fiber inner cylinder in a sleeving mode; the second sleeve comprises a metal inner cylinder and a carbon fiber outer cylinder, the metal outer cylinder is sleeved with the metal inner cylinder, and the metal inner cylinder is sleeved with the carbon fiber outer cylinder; wherein the metal inner cylinder is in clearance fit with the metal outer cylinder. According to the sleeve assembly, the optical transmission system and the processing method, the overall weight is reduced, and use is convenient.

Description

Technical Field

[0001] This application belongs to the field of optical transmission technology, specifically relating to a sleeve assembly, an optical transmission system, and a processing method. Background Technology

[0002] Currently, a key component in a certain domestic optical transmission system is the light transmission sleeve, which is generally a movable joint type of inner and outer sleeve.

[0003] In related technologies, light-transmitting sleeves are usually made of alloy steel. In order to ensure the strength of the light-transmitting sleeve, alloy steel is generally used for preparation. However, alloy steel has a large specific gravity, which makes the overall weight of the light-transmitting sleeve extremely large, affecting its use. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a sleeve assembly, an optical transmission system, and a processing method, aiming to at least partially solve the technical problem of the extremely large overall weight of the light-transmitting sleeve, which affects its use.

[0005] The technical solution of this invention is as follows: A sleeve assembly includes: a first sleeve comprising a carbon fiber inner sleeve and a metal outer sleeve, the metal outer sleeve being fitted over the carbon fiber inner sleeve; and a second sleeve comprising a metal inner sleeve and a carbon fiber outer sleeve, the metal inner sleeve being fitted over the metal outer sleeve, and the carbon fiber outer sleeve being fitted over the metal inner sleeve; wherein the metal inner sleeve and the metal outer sleeve are clearance-fitted.

[0006] In some implementations, the dimensional tolerance of the outer metal cylinder is no greater than 0.005 mm, and the form and position tolerance of the outer metal cylinder is no greater than 0.004 mm.

[0007] In some implementations, the dimensional tolerance of the metal inner cylinder is no greater than 0.005 mm, and the form and position tolerance of the metal inner cylinder is no greater than 0.004 mm.

[0008] In some implementations, the fitting clearance between the inner metal cylinder and the outer metal cylinder is no greater than 0.004 mm.

[0009] Based on the same inventive concept, this application also provides an optical transmission system, including the aforementioned sleeve assembly.

[0010] Based on the same inventive concept, this application also provides a method for processing a sleeve assembly. The method includes: fitting a carbon fiber outer cylinder onto a metal inner cylinder; clamping the carbon fiber outer cylinder using a first clamping fixture, and mounting the first clamping fixture on a lathe to perform finish turning on the inner wall of the metal inner cylinder; mounting the first clamping fixture on a grinding machine to perform rough grinding, semi-finish grinding, and finish grinding on the inner wall of the metal inner cylinder; obtaining the dimensional tolerances and form and position tolerances of the metal inner cylinder; repeating the above steps to obtain a plurality of second sleeves; fitting the metal outer cylinder onto the carbon fiber inner cylinder; clamping the outer cylinder using a second clamping fixture... A carbon fiber inner cylinder is formed, and the second clamping fixture is installed on a lathe to finish-machine the outer wall of the metal outer cylinder; the second clamping fixture is installed on a grinding machine, and the outer wall of the metal outer cylinder is rough-ground, semi-finish-ground, and finish-ground according to the dimensional tolerances and geometric tolerances of the metal inner cylinder; the dimensional tolerances and geometric tolerances of the metal outer cylinder are obtained; the above steps are repeated to obtain a plurality of first sleeves; according to the dimensional tolerances and geometric tolerances of the metal inner cylinder and the metal outer cylinder, a plurality of second sleeves and a plurality of first sleeves are selected and matched so that the metal inner cylinder is fitted onto the corresponding metal outer cylinder.

[0011] In some embodiments, the first clamping fixture includes: a first connecting portion located at the end of the carbon fiber outer cylinder and detachably connected to the carbon fiber outer cylinder; and a second connecting portion located at the end of the first connecting portion away from the carbon fiber outer cylinder.

[0012] In some embodiments, the second clamping fixture includes an insert portion embedded in the carbon fiber inner cylinder; a third connecting portion connected to the insert portion and located at the end of the carbon fiber inner cylinder, the third connecting portion being detachably connected to the carbon fiber inner cylinder; and a fourth connecting portion located at the end of the third connecting portion away from the carbon fiber inner cylinder.

[0013] In some implementations, obtaining the dimensional tolerances and geometrical tolerances of the metal inner cylinder includes: inspecting the metal inner cylinder using an inside micrometer to obtain a first dimensional tolerance and a first geometrical tolerance; inspecting the metal inner cylinder using a three-jaw inside micrometer to obtain a second dimensional tolerance and a second geometrical tolerance; inspecting the metal inner cylinder using an air flotation meter to obtain a third dimensional tolerance and a third geometrical tolerance; taking the average of the first dimensional tolerance, the second dimensional tolerance, and the third dimensional tolerance to obtain the accurate dimensional tolerance of the metal inner cylinder; and taking the first geometrical tolerance and the second... The mean of the form and position tolerances and the third form and position tolerance is used to obtain the accurate form and position tolerances of the inner metal cylinder; obtaining the dimensional tolerances and form and position tolerances of the outer metal cylinder includes: inspecting the outer metal cylinder with an outside diameter lever micrometer to obtain the fourth dimensional tolerance and the fourth form and position tolerance of the outer metal cylinder; inspecting the outer metal cylinder with a coordinate measuring machine to obtain the fifth dimensional tolerance and the fifth form and position tolerance of the outer metal cylinder; taking the mean of the fourth dimensional tolerance and the fifth dimensional tolerance to obtain the accurate dimensional tolerance of the outer metal cylinder; taking the mean of the third form and position tolerance and the fourth form and position tolerance to obtain the accurate form and position tolerances of the outer metal cylinder.

[0014] In some embodiments, the processing method of the sleeve assembly further includes: after precision turning the inner wall of the inner metal cylinder, performing an aging treatment; after rough grinding the inner wall of the inner metal cylinder, performing an aging treatment; after finishing the inner wall of the inner metal cylinder, performing an aging treatment; after precision turning the outer wall of the outer metal cylinder, performing an aging treatment; after rough grinding the outer wall of the outer metal cylinder, performing an aging treatment; and after semi-precision grinding the outer wall of the outer metal cylinder, performing an aging treatment.

[0015] The beneficial effects of the present invention include at least the following: Since the first sleeve comprises a carbon fiber inner cylinder and a metal outer cylinder, with the metal outer cylinder fitted over the carbon fiber inner cylinder, the high strength and low density characteristics of carbon fiber material are fully utilized. While ensuring the structural strength of the first sleeve, its weight is significantly reduced. Since the second sleeve comprises a metal inner cylinder and a carbon fiber outer cylinder, with the carbon fiber outer cylinder fitted over the metal inner cylinder, the application of the carbon fiber outer cylinder reduces the weight of the second sleeve while ensuring its strength. Since the metal inner cylinder is fitted over the metal outer cylinder, the fit between the metal inner cylinder and the metal outer cylinder allows for relative sliding between them. Because the material of the metal inner cylinder fitted over the metal outer cylinder is metal, good rigidity and wear resistance are ensured, guaranteeing the service life of the sleeve assembly.

[0016] This application uses a carbon fiber inner cylinder and a carbon fiber outer cylinder, which successfully reduces the overall weight while meeting the requirements of structural strength and performance. This makes the sleeve assembly easier and more convenient to operate, handle and install, thus improving the user experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 These are schematic diagrams of the sleeve assembly in some embodiments; Figure 2 for Figure 1 A schematic diagram of the structure of the first sleeve of the middle sleeve assembly; Figure 3 for Figure 1 A schematic diagram of the structure of the second sleeve of the middle sleeve assembly; Figure 4 for Figure 1 A schematic diagram of the clamping of the first sleeve of the middle sleeve assembly; Figure 5 for Figure 1 A schematic diagram of the clamping of the second sleeve of the middle sleeve assembly.

[0019] In the attached image: First sleeve 10, carbon fiber inner cylinder 11, metal outer cylinder 12, connecting seat 13; Second sleeve 20, metal inner cylinder 21, carbon fiber outer cylinder 22; First clamping fixture 30, first connecting part 31, second connecting part 32; The second clamping fixture 40 has an insert part 41, a third connecting part 42, and a fourth connecting part 43. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0024] Specific technical solutions will now be described in detail with reference to the accompanying drawings, which are not necessarily drawn to scale. Similar or identical reference numerals may be used to designate the same or similar parts in different figures. The use of similar or identical reference numerals in different figures does not mean that all figures including similar or identical reference numerals constitute a single or the same embodiment. The accompanying drawings illustrate the various embodiments discussed in this application in a generalized, illustrative, and not restrictive manner.

[0025] Combination Figure 1 , Figure 2 and Figure 3 The sleeve assembly of this application includes a first sleeve 10 and a second sleeve 20. The first sleeve 10 includes a carbon fiber inner sleeve 11 and a metal outer sleeve 12, with the metal outer sleeve 12 fitted over the carbon fiber inner sleeve 11. The second sleeve 20 includes a metal inner sleeve 21 and a carbon fiber outer sleeve 22, with the metal inner sleeve 21 fitted over the metal outer sleeve 12 and the carbon fiber outer sleeve 22 fitted over the metal inner sleeve 21. The metal inner sleeve 21 and the metal outer sleeve 12 are fitted with a clearance fit.

[0026] Since the first sleeve 10 includes a carbon fiber inner cylinder 11 and a metal outer cylinder 12, with the metal outer cylinder 12 fitted over the carbon fiber inner cylinder 11, the high strength and low density characteristics of carbon fiber material are fully utilized. While ensuring the structural strength of the first sleeve 10, the weight of the first sleeve 10 is significantly reduced. Since the second sleeve 20 includes a metal inner cylinder 21 and a carbon fiber outer cylinder 22, with the carbon fiber outer cylinder 22 fitted over the metal inner cylinder 21, the application of the carbon fiber outer cylinder 22 reduces the weight of the second sleeve 20 while ensuring its strength. Since the metal inner cylinder 21 is fitted over the metal outer cylinder 12, the cooperation between the metal inner cylinder 21 and the metal outer cylinder 12 allows for relative sliding between them. Since the material of the metal inner cylinder 21 fitted over the metal outer cylinder 12 is metal, good rigidity and wear resistance are ensured, thus guaranteeing the service life of the sleeve assembly.

[0027] This application uses a carbon fiber inner cylinder 11 and a carbon fiber outer cylinder 22, which successfully reduces the overall weight while meeting the requirements of structural strength and performance. This makes the sleeve assembly easier and more convenient to operate, handle and install, thus improving the user experience.

[0028] In some embodiments, the outer metal cylinder 12 and the inner metal cylinder 21 may be made of bearing steel.

[0029] In some embodiments, the dimensional tolerance of the metal outer cylinder 12 is no greater than 0.005 mm, and the form and position tolerance of the metal outer cylinder 12 is no greater than 0.004 mm, so as to ensure that the metal outer cylinder 12 can meet the requirements.

[0030] In some embodiments, the dimensional tolerance of the inner metal cylinder 21 is no greater than 0.005 mm, and the form and position tolerance of the inner metal cylinder 21 is no greater than 0.004 mm, so as to ensure that the outer metal cylinder 12 can meet the requirements.

[0031] In some embodiments, the fitting gap between the inner metal cylinder 21 and the outer metal cylinder 12 is no greater than 0.004 mm, so that the inner metal cylinder 21 and the outer metal cylinder 12 can move and rotate flexibly and smoothly in the axial direction, while there is no shaking between the inner metal cylinder 21 and the outer metal cylinder 12, so as to meet the requirements of the technical specifications for flexible and smooth movement of the inner metal cylinder 21 and the outer metal cylinder 12 and the fitting accuracy meeting the requirements of the application.

[0032] Based on the same inventive concept, this application also proposes an optical transmission system that uses a sleeve assembly. The specific structure of the sleeve assembly is as described in the above embodiments. Since the sleeve assembly adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0033] Combination Figure 4 and Figure 5 Based on the same inventive concept, in order to solve the dimensional deviation problem in the production of the first sleeve 10 and the second sleeve 20, this application also provides a method for processing a sleeve assembly. The method for processing the sleeve assembly includes: Step S1: Fit the carbon fiber outer cylinder 22 onto the outside of the metal inner cylinder 21.

[0034] After the carbon fiber outer cylinder 22 is fitted onto the metal inner cylinder 21, the carbon fiber outer cylinder 22 and the metal inner cylinder 21 can be connected by adhesive bonding.

[0035] Step S2: The carbon fiber outer cylinder 22 is clamped by the first clamping fixture 30 and the first clamping fixture 30 is installed on the lathe to perform precision machining on the inner wall of the metal inner cylinder 21.

[0036] Step S3: Install the first clamping fixture 30 on the grinding machine to perform rough grinding, semi-fine grinding and fine grinding on the inner wall of the metal inner cylinder 21, so as to ensure that the dimensional tolerance and form and position tolerance of the metal inner cylinder 21 meet the requirements, and to ensure that the fit clearance between the metal inner cylinder 21 and the metal outer cylinder 12 meets the assembly requirements.

[0037] After the inner wall of the inner metal cylinder 21 is precision machined, the inner and outer metal shell parts are left with a 0.2mm allowance for the rough grinding process, a 0.1mm allowance for the semi-fine grinding process, and a 0.03mm allowance for the fine grinding process.

[0038] Step S4: Obtain the dimensional tolerances and geometric tolerances of the inner metal cylinder 21.

[0039] Step S5: Repeat the above steps to obtain multiple second sleeves 20.

[0040] Step S6: Fit the metal outer cylinder 12 onto the carbon fiber inner cylinder 11.

[0041] After the metal outer cylinder 12 is fitted over the carbon fiber inner cylinder 11, the metal outer cylinder 12 and the carbon fiber inner cylinder 11 can be connected by adhesive bonding.

[0042] Step S7: The carbon fiber inner cylinder 11 is clamped by the second clamping fixture 40 and the second clamping fixture 40 is installed on the lathe to perform precision machining on the outer wall of the metal outer cylinder 12.

[0043] Step S8: Install the second clamping fixture 40 on the grinding machine, and perform rough grinding, semi-finish grinding and finish grinding on the outer wall of the metal outer cylinder 12 according to the dimensional tolerance and form and position tolerance of the metal inner cylinder 21, so as to ensure that the dimensional tolerance and form and position tolerance of the metal outer cylinder 12 meet the requirements, and to ensure that the fit clearance between the metal inner cylinder 21 and the metal outer cylinder 12 meets the assembly requirements.

[0044] After the inner wall of the outer metal cylinder 12 is precision machined, the inner and outer metal shell parts are left with a 0.2mm allowance for the rough grinding process, a 0.1mm allowance for the semi-fine grinding process, and a 0.03mm allowance for the fine grinding process.

[0045] Step S9: Obtain the dimensional tolerances and geometric tolerances of the metal outer cylinder 12.

[0046] Step S10: Repeat the above steps to obtain a plurality of first sleeves 10.

[0047] Step S11: Based on the dimensional tolerances and geometric tolerances of the inner metal cylinder 21 and the outer metal cylinder 12, select and match multiple second sleeves 20 and multiple first sleeves 10 so that the inner metal cylinder 21 is fitted onto the matching outer metal cylinder 12.

[0048] Based on the dimensional and geometric tolerances of the inner metal cylinder 21 and the outer metal cylinder 12, multiple second sleeves 20 and multiple first sleeves 10 are analyzed, paired, processed, and matched to achieve the optimal fit clearance. In other words, metal inner cylinders 21 and outer metal cylinders 12 with similar dimensions are matched and tested to find the optimal fit clearance between the inner metal cylinder 21 and the outer metal cylinder 12.

[0049] In some embodiments, since the inner wall of the metal inner cylinder 21 is difficult to process, the size of the inner wall of the metal inner cylinder 21 is difficult to control. Therefore, the inner wall of the metal inner cylinder 21 is processed first, and then the outer wall of the metal outer cylinder 12 is processed so that the metal outer cylinder 12 can fit the metal inner cylinder 21.

[0050] In related technologies, bearing steel undergoes quenching heat treatment at HRC50-55 degrees Celsius. During processing, it is prone to vibration and deformation, and the clamping deformation during processing is relatively large. It is difficult to control the clamping force and clamping deformation, which affects the processing quality.

[0051] Combination Figure 4 In some embodiments, to reduce clamping deformation, the first clamping fixture 30 includes a first connecting portion 31 and a second connecting portion 32. The first connecting portion 31 is located at the end of the carbon fiber outer cylinder 22 and is detachably connected to the carbon fiber outer cylinder 22. By connecting to the end of the carbon fiber outer cylinder 22, no radial force is applied to the metal inner cylinder 21, ensuring the cylindricity of the metal inner cylinder 21, reducing clamping deformation, and ensuring that the dimensional tolerances and form and position tolerances of the metal inner cylinder 21 meet the requirements. The second connecting portion 32 is located at the end of the first connecting portion away from the carbon fiber outer cylinder 22 to achieve connection with a lathe or grinding machine.

[0052] Combination Figure 5In some embodiments, to reduce clamping deformation, the second clamping fixture 40 includes an insert portion 41, a third connecting portion 42, and a fourth connecting portion 43. The insert portion 41 is embedded inside the carbon fiber inner cylinder 11 to achieve radial positioning. The third connecting portion 42 is connected to the insert portion 41 and is located at the end of the carbon fiber inner cylinder 11. The third connecting portion 42 is detachably connected to the carbon fiber inner cylinder 11. By connecting to the end of the carbon fiber inner cylinder 11, no radial force is applied to the metal outer cylinder 12, ensuring the cylindricity of the metal outer cylinder 12, reducing clamping deformation, and ensuring that the dimensional tolerances and form and position tolerances of the metal outer cylinder 12 meet the requirements. The fourth connecting portion 43 is located at the end of the third connecting portion 42 away from the carbon fiber inner cylinder 11 to achieve connection with a lathe or grinding machine.

[0053] In some embodiments, to avoid the embedding part 41 interfering with the processing of the metal outer cylinder 12, the carbon fiber outer cylinder 11 has a connecting seat 13 connected to the third connecting part 42, and the thickness of the embedding part 41 is less than or equal to the thickness of the connecting seat 13, so as to reduce clamping deformation.

[0054] In some embodiments, the projection of the embedded part 41 on the carbon fiber outer cylinder 11 along the radial direction of the carbon fiber outer cylinder 11 does not overlap with the projection of the metal outer cylinder 12 on the carbon fiber outer cylinder 11, so as to reduce clamping deformation.

[0055] In some embodiments, obtaining the dimensional tolerances and geometric tolerances of the metal inner cylinder 21 includes: Step S41: The metal inner cylinder 21 is inspected using an inner micrometer to obtain the first dimensional tolerance and the first geometric tolerance of the metal inner cylinder 21.

[0056] Step S42: The metal inner cylinder 21 is inspected using a three-jaw inside micrometer to obtain the second dimensional tolerance and the second form and position tolerance of the metal inner cylinder 21.

[0057] Step S43: The metal inner cylinder 21 is inspected using an air flotation meter to obtain the third dimensional tolerance and the third geometric tolerance of the metal inner cylinder 21.

[0058] Step S44: Take the average of the first dimensional tolerance, the second dimensional tolerance, and the third dimensional tolerance to obtain the accurate dimensional tolerance of the metal inner cylinder 21.

[0059] Step S45: Take the average of the first form and position tolerance, the second form and position tolerance and the third form and position tolerance to obtain the accurate form and position tolerance of the metal inner cylinder 21.

[0060] It can comprehensively and accurately evaluate the dimensional tolerances and geometric tolerances of the metal inner cylinder 21, so as to ensure that the dimensional tolerances and geometric tolerances of the obtained metal inner cylinder 21 are accurate.

[0061] The dimensional and geometric tolerances of the outer metal cylinder 12 are obtained as follows: Step S91: The metal outer cylinder 12 is inspected using an outside diameter lever micrometer to obtain the fourth dimensional tolerance and the fourth geometric tolerance of the metal outer cylinder 12.

[0062] Step S92: The metal outer cylinder 12 is inspected by a coordinate measuring machine to obtain the fifth dimensional tolerance and the fifth geometric tolerance of the metal outer cylinder 12.

[0063] Step S93: Take the average of the third dimensional tolerance and the fourth dimensional tolerance to obtain the accurate dimensional tolerance of the metal outer cylinder 12.

[0064] Step S94: Take the average of the third and fourth form and position tolerances to obtain the accurate form and position tolerances of the metal outer cylinder 12.

[0065] It can comprehensively and accurately evaluate the dimensional tolerances and geometric tolerances of the metal outer cylinder 12, so as to ensure that the dimensional tolerances and geometric tolerances of the obtained metal outer cylinder 12 are accurate.

[0066] When the inner metal cylinder 21 and the outer metal cylinder 12 are precision turned, rough ground and semi-precision ground, internal stress will exist. The internal stress will affect the dimensional tolerances and geometric tolerances of the inner metal cylinder 21 and the outer metal cylinder 12.

[0067] In some embodiments, the method for processing the sleeve assembly further includes, in order to relieve stress: After precision machining of the inner wall of the metal inner cylinder 21, an aging treatment is performed.

[0068] After rough grinding of the inner wall of the metal inner cylinder 21, aging treatment is carried out.

[0069] After the inner wall of the metal inner cylinder 21 is treated with aging.

[0070] After precision machining of the outer wall of the metal outer cylinder 12, aging treatment is carried out.

[0071] After rough grinding of the outer wall of the metal outer cylinder 12, aging treatment is carried out.

[0072] After semi-finish grinding of the outer wall of the metal outer cylinder 12, aging treatment is carried out.

[0073] The aging process is as follows: after each process is completed, the inner metal cylinder 21 and the outer metal cylinder 12 are placed for 24 hours of natural aging to fully release the internal stress of processing, and to ensure that the dimensional tolerances and form and position tolerances of the inner metal cylinder 21 and the outer metal cylinder 12 are minimized, so as to meet the design requirements.

[0074] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0075] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0077] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0078] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A sleeve assembly, characterized in that, include: The first sleeve includes a carbon fiber inner sleeve and a metal outer sleeve, wherein the metal outer sleeve is fitted over the carbon fiber inner sleeve; The second sleeve includes a metal inner cylinder and a carbon fiber outer cylinder, wherein the metal inner cylinder is sleeved outside the metal outer cylinder and the carbon fiber outer cylinder is sleeved outside the metal inner cylinder; The inner metal cylinder and the outer metal cylinder are fitted with a clearance.

2. The sleeve assembly according to claim 1, characterized in that, The dimensional tolerance of the outer metal cylinder is no greater than 0.005 mm, and the form and position tolerance of the outer metal cylinder is no greater than 0.004 mm.

3. The sleeve assembly according to claim 1, characterized in that, The dimensional tolerance of the metal inner cylinder is no greater than 0.005 mm, and the form and position tolerance of the metal inner cylinder is no greater than 0.004 mm.

4. The sleeve assembly according to any one of claims 1-3, characterized in that, The clearance between the inner metal cylinder and the outer metal cylinder is no greater than 0.004 mm.

5. An optical transmission system, characterized in that, Includes the sleeve assembly as described in any one of claims 1-4.

6. A method for processing a sleeve assembly, characterized in that, Based on the sleeve assembly according to any one of claims 1-4, the method for processing the sleeve assembly includes: The carbon fiber outer cylinder is fitted over the metal inner cylinder; The carbon fiber outer cylinder is clamped by the first clamping fixture, and the first clamping fixture is installed on the lathe to perform precision machining on the inner wall of the metal inner cylinder. The first clamping fixture is installed on a grinding machine to perform rough grinding, semi-fine grinding and fine grinding on the inner wall of the metal inner cylinder; Obtain the dimensional tolerances and geometric tolerances of the metal inner cylinder; Repeat the above steps to obtain multiple second sleeves; The outer metal cylinder is fitted over the inner carbon fiber cylinder; The carbon fiber inner cylinder is clamped by a second clamping fixture, and the second clamping fixture is installed on a lathe to perform precision machining on the outer wall of the metal outer cylinder. The second clamping fixture is installed on the grinding machine, and the outer wall of the metal outer cylinder is rough ground, semi-finished ground and fine ground according to the dimensional tolerance and form and position tolerance of the metal inner cylinder; Obtain the dimensional tolerances and geometric tolerances of the metal outer cylinder; Repeat the above steps to obtain a plurality of the first sleeves; Based on the dimensional and geometrical tolerances of the inner metal cylinder and the outer metal cylinder, a plurality of second sleeves and a plurality of first sleeves are selected and matched so that the inner metal cylinder is fitted onto the outer metal cylinder of the corresponding type.

7. The method for processing the sleeve assembly according to claim 6, characterized in that, The first clamping fixture includes: The first connecting part is located at the end of the carbon fiber outer cylinder and is detachably connected to the carbon fiber outer cylinder; The second connecting part is located at the end of the first connecting part away from the carbon fiber outer cylinder.

8. The method for processing the sleeve assembly according to claim 6, characterized in that, The second clamping fixture includes: An embedding part is embedded inside the carbon fiber inner cylinder; The third connecting part is connected to the embedded part and is located at the end of the carbon fiber inner cylinder. The third connecting part is detachably connected to the carbon fiber inner cylinder. The fourth connecting part is located at the end of the third connecting part away from the carbon fiber inner cylinder.

9. The method for processing the sleeve assembly according to claim 6, characterized in that: Obtaining the dimensional tolerances and geometric tolerances of the metal inner cylinder includes: The metal inner cylinder is inspected using an inner micrometer to obtain the first dimensional tolerance and the first geometric tolerance of the metal inner cylinder; The metal inner cylinder is inspected using a three-jaw inside micrometer to obtain the second dimensional tolerance and the second form and position tolerance of the metal inner cylinder; The metal inner cylinder is inspected using an air flotation meter to obtain the third dimensional tolerance and the third form and position tolerance of the metal inner cylinder; The average of the first dimensional tolerance, the second dimensional tolerance, and the third dimensional tolerance is taken to obtain the accurate dimensional tolerance of the metal inner cylinder; The average of the first form and position tolerance, the second form and position tolerance, and the third form and position tolerance is taken to obtain the accurate form and position tolerance of the metal inner cylinder; Obtaining the dimensional tolerances and geometric tolerances of the metal outer cylinder includes: The metal outer cylinder is inspected using an outside-diameter lever micrometer to obtain the fourth dimensional tolerance and the fourth geometric tolerance of the metal outer cylinder; The metal outer cylinder is inspected using a coordinate measuring machine to obtain the fifth dimensional tolerance and the fifth geometric tolerance of the metal outer cylinder; The average of the fourth dimensional tolerance and the fifth dimensional tolerance is taken to obtain the accurate dimensional tolerance of the metal outer cylinder; The average of the third and fourth form and position tolerances is taken to obtain the accurate form and position tolerance of the metal outer cylinder.

10. The method for processing the sleeve assembly according to claim 6, characterized in that, The processing method of the sleeve assembly further includes: After precision machining of the inner wall of the metal inner cylinder, an aging treatment is performed. After rough grinding the inner wall of the metal inner cylinder, an aging treatment is performed. After the inner wall of the metal inner cylinder is cleaned, an aging treatment is performed. After precision machining of the outer wall of the metal outer cylinder, an aging treatment is performed. After rough grinding the outer wall of the metal outer cylinder, an aging treatment is performed. After semi-finish grinding of the outer wall of the metal outer cylinder, aging treatment is performed.

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