Pre-termination of indoor and outdoor lead-in flat cable and processing method thereof

Abstract

The invention discloses a pre-termination of an indoor and outdoor lead-in flat cable and a processing method thereof, the pre-termination of the indoor and outdoor lead-in flat cable comprises a flat cable body, two ends of the flat cable body are respectively and fixedly provided with an A-end flat multi-core splitter and a B-end flat multi-core splitter, the pre-termination flat cable technology is adopted, the technical cost required by construction welding is effectively reduced, and the construction efficiency is improved. On-site labor cost burdens are reduced for customers, the overall application cost is further reduced, in addition, due to the pre-terminating design, the labor cost is greatly reduced, the construction efficiency is greatly improved, the convenience of taking and using is achieved, rapid project promotion is ensured, and therefore the market competitiveness of products is enhanced on the efficiency level; compared with an on-site welding flat cable, the pre-terminating scheme has the advantages that the reliability of an interface position is obviously improved, the problems of limitation of straight pulling and side pulling and interface protection in on-site welding are solved, the bottleneck is thoroughly eliminated, and a new benchmark is established for the product reliability.

Description

Technical Field

[0001] The invention relates to the technical field of flat cables, in particular to a pre-termination of an indoor and outdoor introduced flat cable and a processing method thereof. Background Art

[0002] Flat cables are flat in shape. Compared with round cables, they take up less space with the same cross-sectional area. Especially in narrow spaces or where tight wiring is required, flat cables can better adapt to space constraints and avoid the crowding and confusion that may occur with round cables. In addition, the layout of flat cables is more reasonable and delicate, and the size is small. It can solve the bending problem of the use environment without causing kinks. The flat shape of flat cables makes it easier to install and fix. Flat cables can be firmly installed on the surface or internal structure of the equipment by pasting, clamping or screwing, while round cables need to be fixed with special cable clamps or pipes, and the installation process is relatively complicated. In addition, flat cables are lighter in weight, easier to carry and install, and reduce the labor during installation. Dynamic strength. Although the flat cable is relatively flat in appearance, it still has a certain degree of flexibility and can be bent and twisted to a certain extent. This flexibility allows the flat cable to adapt to different installation angles and shape requirements, providing more possibilities for the design and layout of the equipment. In contrast, the bending radius of the round cable is larger, which may be limited in some occasions that require frequent bending. The flat shape of the flat cable increases its contact area with the air, which is conducive to heat dissipation. In some high-power equipment, the heat dissipation performance of the cable is crucial. The flat cable can better dissipate the heat generated inside the cable, reduce the temperature of the cable, and improve the reliability and service life of the cable. The heat dissipation performance of the round cable is relatively poor, and additional heat dissipation measures may need to be taken in high-power applications.

[0003] Comparative document, application number 202011481307.X, the present invention discloses a copper cable pre-terminated connector, which relates to the field of pre-terminated copper cables in network data center computer rooms and industrial equipment connections, and includes a plug, a housing, a locking sleeve, a circuit board, and a clamping firmware. The present invention can solve the displacement problem of the termination node caused by material stress degradation that may occur during the use of the existing data copper cable pre-terminated connector after termination, increase the copper cable pre-terminated connector and the data copper cable's ability to resist lateral pulling and torsion, and optimize the signal insertion loss and return loss through the channel and the incoming line path;

[0004] The comparative document, application number 202410611567.6, discloses a branch connector technology field of a photoelectric hybrid cable, and discloses a photoelectric hybrid cable branch connector, comprising a hybrid cable access device and a plurality of branch connectors, the hybrid cable access device branches out a plurality of branches, the branches are connected to the branch connectors, the hybrid cable access device comprises an access shell and a photoelectric hybrid cable, the photoelectric hybrid cable is accessed from the tail of the access shell, the head of the access shell is connected with a cap, a plurality of outlet holes are penetrated through the cap, a plurality of branches pass through different outlet holes, a sealing cavity is provided in the cap, each outlet hole is coaxially provided with a hollow column, a rubber sealing column is coaxially provided in the hollow column, a pressure plate is movably provided in the sealing cavity, a hollow pressure ring is provided at the position of the pressure plate corresponding to the outlet hole, the hollow pressure ring is used to move into the hollow column to extrude the rubber sealing column, so that the rubber sealing column is deformed to fit the outer wall of the branch line to form a high-strength sealing surface, and the lead-out branch line position of the photoelectric hybrid cable is sealed without affecting the detachability of the branch connector.

[0005] However, the above-mentioned comparative documents still have the following shortcomings:

[0006] In the above document, the branch connector seals the lead-out branch position of the optoelectronic hybrid cable without affecting the detachability of the branch connector. The copper cable pre-terminated connector optimizes the insertion loss and return loss of the signal through the channel and the incoming line path. However, there is still a problem of adhesion between the central unit cable and the PE sheath, which affects the normal use of the flat cable. Summary of the invention

[0007] The object of the present invention is to provide a pre-termination of an indoor and outdoor flat cable and a processing method thereof, so as to solve the problem in the above document proposed in the above background technology that a branch connector seals the lead-out branch line position of an optoelectronic hybrid cable without affecting the detachability of the branch connector, and the copper cable pre-termination connector optimizes the insertion loss and return loss of the signal through the channel and the incoming line path. However, there is still a problem of adhesion between the central unit cable and the PE sheath, which affects the normal use of the flat cable.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pre-end for introducing a flat cable indoors and outdoors, comprising a flat cable body, wherein an A-end flat multi-core splitter and a B-end flat multi-core splitter are respectively fixedly installed at both ends of the flat cable body, and one side of the A-end flat multi-core splitter and one side of the B-end flat multi-core splitter are fixedly connected with a plurality of branch lines, one side of the plurality of branch lines are fixedly connected with a connection assembly, one side of the plurality of connection assemblies are fixedly installed with a joint assembly, and the joint assembly comprises a stress cone and a flange, one end of the flange is connected to one end of the stress cone, and the other end of the flange is connected with a heat shrinkable sealing tube.

[0009] As a preferred technical solution of the present invention, several of the connecting components include a first connecting line, a retainer and a second connecting line, one end of the retainer is connected to one end of the first connecting line, the other end of the retainer is connected to one end of the second connecting line, and a plurality of grooves are provided on the surface of the retainer.

[0010] As a preferred technical solution of the present invention, one end of the first connecting line away from the retainer is connected to the branch line, and one end of the second connecting line away from the retainer is connected to the connector assembly.

[0011] As a preferred technical solution of the present invention, a bracelet contact is installed on the side of the stress cone away from the flange, a cone clamp is fixedly installed on one side of the bracelet contact, and a sealing cover is clamped and installed on the surface of the cone clamp.

[0012] As a preferred technical solution of the present invention, a cable is installed on the side of the heat shrinkable sealing tube away from the flange, and one end of the cable away from the heat shrinkable sealing tube is connected to the connecting assembly.

[0013] The present invention provides a method for pre-terminating an indoor and outdoor flat cable, comprising the following steps:

[0014] Step 1: Wire cutting: Prepare the corresponding wire cutting tools. Before stripping the wires, carefully observe the structure of the flat cable and identify the various parts of the cable, especially the insulation layer and the conductor. Through careful observation, better determine the stripping position to avoid damage to the wires inside the cable and perform wire stripping.

[0015] Step 2: Make branches: Select an insulating sleeve of appropriate size and insert it into the exposed conductor, ensuring that the insulating sleeve fully covers the conductor and fits tightly with the conductor. To improve the connection quality of the crimping connector, appropriately reduce the lead-out distance, strip a length of the cable conductor under the insulating sleeve, and trim the conductor with a wire stripper. According to the flat cable and the selected crimping connector model, use a screwdriver of appropriate size or a special tool for crimping, ensuring that the screwdriver is tightened evenly to achieve a good electrical connection;

[0016] Step 3: Fiber introduction: insert multiple optical fibers into a loose tube made of high modulus plastic filled with water-blocking composite, place reinforcements evenly outside the loose tube, and place two FRPs in parallel on both sides;

[0017] Step 4: Thread the loose parts: Thread the various loose parts onto the optical fiber in advance, in the following order: rubber sheath, heat shrink tube, support tube, spring, and pay attention to whether the direction is correct;

[0018] Step 5: Peel off the outer sheath: Use aramid scissors to cut the length of the optical cable as needed, and then simply coil it;

[0019] Step 6: Glue injection: Use auxiliary tools to evenly mix Part A and Part B of 353nd glue in a ratio of 10:1, and inject the glue after minimizing bubbles;

[0020] Step 7: Curing: Put the ferrule with the optical fiber into the curing oven and bake it until the 353nd glue is completely cured and removed;

[0021] Step 8. Crimping: Use a screwdriver or special tool of appropriate size to crimp the flat cable and the type of crimping connector you choose. Make sure to tighten the screwdriver evenly to achieve a good electrical connection;

[0022] Step 9, grinding: Grind the end face of the ferrule on a grinder. The general process is 9u, 3u, 1u, 0.05u;

[0023] Step 10: End face inspection: Use an end inspection instrument with a magnification of 400 times to check the grinding effect of the ferrule end face. End faces with black spots or large scratches are considered unqualified and need to be re-grinded;

[0024] Step 11, 3D interference detection: The product is subjected to the analysis of the interferometer and interference fringes. The interferometer and the analysis of interference fringes evaluate the spherical radius and fiber height of the end face of the optical fiber connector. First, the shape of the connector end face must be measured. The interferometer has the advantages of high measurement, fast speed and low cost. It is an effective means to measure the surface shape. After the light emitted by the light source is reflected by the semi-transparent mirror to the Mirow interference objective lens, the light is focused on the end face of the optical fiber connector to be tested. After the end face is reflected, the light reflected by the reflective surface of the Mirow interference objective lens passes through the semi-transparent mirror together with the light, and the image is formed on the CCD camera. At this time, the interference fringes can be observed on the CCD camera. The image measured by the CCD camera is transmitted to the computer through the image card for analysis and processing. We get the measurement results we need. The PZT (piezoelectric ceramic assembly) controlled by the computer through the control card and the control loop is used to move the Mirow interference objective lens to produce phase shift. The Fourier transform method 2, 3, 4 can be used to analyze the interference fringes, and the phase shift method 5, 6 can also be used. The Fourier transform method has the advantages of simplicity, speed and low cost, but it is relatively low and is generally used for simple measuring instruments. For the measurement of the end face shape of the optical fiber connector, the phase shift method with higher resolution is generally used. It must be pointed out that phase connection is a relatively complex process. Choosing different phase connection algorithms will result in different calculation speeds and stability.

[0025] Step 12: Polarity test: Use the desktop MPO / MTP single-mode and multi-mode patch cord polarity tester to test the polarity of the product;

[0026] Step 13: Assemble: Assemble the ground ferrule and parts into a connector, and crimp the tail sleeve using crimping pliers or a crimping machine;

[0027] Step 14: Finished product testing: Use the insertion loss tester to measure the main data of the optical fiber head, and the quality inspection personnel will conduct random inspections on qualified products after the test to control the quality;

[0028] Step 15: Packaging: Final packaging of qualified products.

[0029] As a preferred technical solution of the present invention, the wire cutting tools in step 1 specifically include wire strippers or wire stripping knives, wire stripping shears and other auxiliary tools. Make sure these tools are clean, sharp, and in good working condition. The wire cutting and stripping in step 1 specifically involves gently stripping the outer skin. Use wire strippers or wire stripping knives to gently strip the outer skin of the cable, keep your hands stable, use moderate force, and avoid cutting the internal wires. If more delicate operations are required, use a wallpaper knife to make scratches of a certain depth in the opposite direction of the head at the center of both sides of the flat cable, and then use a wallpaper knife to cut longitudinally along the gap between the insulations of the two cores to separate the insulation from the insulation. Finally, use pliers to clamp the outer skin head and use it to separate it from the insulation layer, and cut the separated outer sheath with a blade to keep it neat and beautiful.

[0030] As a preferred technical solution of the present invention, the debonding in step seven is specifically to cut off the excess optical fiber exposed in the front, install the optical fiber head on a grinding fixture, polish it with debonding sandpaper, and remove the glue on the ferrule head.

[0031] As a preferred technical solution of the present invention, the main data in step fourteen are specifically such as insertion loss and return loss. The insertion loss of single mode should be less than or equal to 0.3dB, and the return loss should be greater than or equal to 50dB.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The use of pre-terminated flat cable technology effectively reduces the technician cost required for construction welding, reduces the on-site labor cost burden for customers, and thus reduces the overall application cost. In addition, the pre-terminated design not only greatly reduces labor costs, but also greatly improves construction efficiency, realizes the convenience of ready-to-use, ensures the rapid advancement of the project, and thus enhances the market competitiveness of the product at the efficiency level;

[0034] 2. Compared with flat cables spliced ​​on site, the pre-terminated solution significantly improves the reliability of the interface position, solves the problem of limited straight-pull and side-pull and interface protection during on-site splicing, completely eliminates this bottleneck, and sets a new benchmark for product reliability;

[0035] 3. The accuracy and tightness of the flat cable pre-terminated optical cable products can realize rapid wiring at the project site; the flat cable pre-terminated corresponding to each channel docking loss ≤ 0.3dB, ensuring that the connection process has a mutual replacement effect; the product branch tension structure design, each corresponding branch of the entire branch line can withstand 70N of tension, which improves the reliability of the product; meet the original requirements of the pre-termination of the connector for the introduction of flat cables indoors and outdoors, and solve the bottleneck problem of the closed tension of the flat cable branch pre-termination. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a side view of the present invention;

[0037] Figure 2 is a side view of the connection assembly of the present invention;

[0038] Figure 3 is a side view of the connector assembly of the present invention;

[0039] Figure 4 It is a flow chart of the present invention.

[0040] In the figure: 1. Flat cable body; 2. Flat multi-core splitter at end A; 3. Flat multi-core splitter at end B; 4. Branch line; 5. Connection assembly; 51. First connection line; 52. Retainer; 53. Second connection line; 54. Groove; 6. Connector assembly; 61. Sealing cover; 62. Conical card; 63. Chain contact; 64. Stress cone; 65. Flange; 66. Cable; 67. Heat shrinkable sealing tube. DETAILED DESCRIPTION

[0041] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figure 1-4 The present invention provides a pre-termination for introducing a flat cable indoors and outdoors, comprising a flat cable body 1, wherein an A-end flat multi-core splitter 2 and a B-end flat multi-core splitter 3 are fixedly installed at both ends of the flat cable body 1, a plurality of branch lines 4 are fixedly connected to one side of the A-end flat multi-core splitter 2 and one side of the B-end flat multi-core splitter 3, a plurality of branch lines 4 are fixedly connected to one side of a connection assembly 5, a plurality of connection assemblies 5 are fixedly installed to one side of a joint assembly 6, the joint assembly 6 comprises a stress cone 64 and a flange 65, one end of the flange 65 is connected to one end of the stress cone 64, and the other end of the flange 65 is connected to a heat shrinkable sealing tube 67.

[0043] Several connecting components 5 each include a first connecting line 51, a retainer 52 and a second connecting line 53, one end of the retainer 52 is connected to one end of the first connecting line 51, and the other end of the retainer 52 is connected to one end of the second connecting line 53, and a plurality of grooves 54 are provided on the surface of the retainer 52.

[0044] One end of the first connection line 51 away from the retainer 52 is connected to the branch line 4 , and one end of the second connection line 53 away from the retainer 52 is connected to the connector assembly 6 .

[0045] A bracelet contact 63 is installed on the side of the stress cone 64 away from the flange 65 , a cone clamp 62 is fixedly installed on one side of the bracelet contact 63 , and a sealing cover 61 is mounted on the surface of the cone clamp 62 .

[0046] A cable 66 is installed on a side of the heat shrinkable sealing tube 67 away from the flange 65 , and one end of the cable 66 away from the heat shrinkable sealing tube 67 is connected to the connecting component 5 .

[0047] The present invention provides a method for pre-terminating an indoor and outdoor flat cable, comprising the following steps:

[0048] Step 1: Wire cutting: Prepare the corresponding wire cutting tools. Before stripping the wires, carefully observe the structure of the flat cable and identify the various parts of the cable, especially the insulation layer and the conductor. Through careful observation, better determine the stripping position to avoid damage to the wires inside the cable and perform wire stripping.

[0049] Step 2: Make branches: Select an insulating sleeve of appropriate size and insert it into the exposed conductor, ensuring that the insulating sleeve fully covers the conductor and fits tightly with the conductor. To improve the connection quality of the crimping connector, appropriately reduce the lead-out distance, strip a length of the cable conductor under the insulating sleeve, and trim the conductor with a wire stripper. According to the flat cable and the selected crimping connector model, use a screwdriver of appropriate size or a special tool for crimping, ensuring that the screwdriver is tightened evenly to achieve a good electrical connection;

[0050] Step 3: Fiber introduction: insert multiple optical fibers into a loose tube made of high modulus plastic filled with water-blocking composite, place reinforcements evenly outside the loose tube, and place two FRPs in parallel on both sides;

[0051] Step 4: Thread the loose parts: Thread the various loose parts onto the optical fiber in advance, in the following order: rubber sheath, heat shrink tube, support tube, spring, and pay attention to whether the direction is correct;

[0052] Step 5: Peel off the outer sheath: Use aramid scissors to cut the length of the optical cable as needed, and then simply coil it;

[0053] Step 6: Glue injection: Use auxiliary tools to evenly mix Part A and Part B of 353nd glue in a ratio of 10:1, and inject the glue after minimizing bubbles;

[0054] Step 7: Curing: Put the ferrule with the optical fiber into the curing oven and bake it until the 353nd glue is completely cured and removed;

[0055] Step 8. Crimping: Use a screwdriver or special tool of appropriate size to crimp the flat cable and the type of crimping connector you choose. Make sure to tighten the screwdriver evenly to achieve a good electrical connection;

[0056] Step 9, grinding: Grind the end face of the ferrule on a grinder. The general process is 9u, 3u, 1u, 0.05u;

[0057] Step 10: End face inspection: Use an end inspection instrument with a magnification of 400 times to check the grinding effect of the ferrule end face. End faces with black spots or large scratches are considered unqualified and need to be re-grinded;

[0058] Step 11, 3D interference detection: Interferometer and interference fringes analysis of the product, interferometer and interference fringes analysis to evaluate the spherical radius and fiber height of the fiber connector end face, first of all, the shape of the connector end face must be measured. Interferometer has the advantages of high measurement, fast speed and low cost, and is an effective means of measuring surface shape. After the light emitted by the light source is reflected by the semi-transparent mirror to the Mirow interference objective lens, the light is focused on the end face of the fiber connector to be tested, and after reflection from the end face, the light reflected by the reflective surface of the Mirow interference objective lens passes through the semi-transparent mirror together, and is imaged on the CCD camera. At this time, interference fringes can be observed on the CCD camera, and the image measured by the CCD camera is transmitted to the computer through the image card for analysis and processing. We get the measurement results we need. The PZT (piezoelectric ceramic assembly) controlled by the computer through the control card and the control loop is used to move the Mirow interference objective lens to produce phase shift. The Fourier transform method 2, 3, 4 can be used to analyze the interference fringes, and the phase shift method 5, 6 can also be used. The Fourier transform method has the advantages of simplicity, speed and low cost, but it is relatively low and is generally used for simple measuring instruments. For the measurement of the end face shape of the optical fiber connector, the phase shift method with higher resolution is generally used. It must be pointed out that phase connection is a relatively complex process. Choosing different phase connection algorithms will result in different calculation speeds and stability.

[0059] Step 12: Polarity test: Use the desktop MPO / MTP single-mode and multi-mode patch cord polarity tester to test the polarity of the product;

[0060] Step 13: Assemble: Assemble the ground ferrule and parts into a connector, and crimp the tail sleeve using crimping pliers or a crimping machine;

[0061] Step 14: Finished product testing: Use the insertion loss tester to measure the main data of the optical fiber head, and the quality inspection personnel will conduct random inspections on qualified products after the test to control the quality;

[0062] Step 15: Packaging: Final packaging of qualified products.

[0063] The wire cutting tools in step 1 include wire strippers or wire stripping knives, wire stripping shears and other auxiliary tools. Make sure these tools are clean, sharp and in good working condition. The wire stripping in step 1 is to gently strip the outer skin. Use wire strippers or wire stripping knives to gently strip the outer skin of the cable, keep your hands stable, use moderate force, and avoid cutting the internal wires. If more delicate operations are required, use wallpaper knives to make a certain depth of scratches in the opposite direction of the head at the center of both sides of the flat cable, and then use wallpaper knives to cut longitudinally along the gap between the insulation of the two cores to separate the insulation from the insulation. Finally, use pliers to clamp the outer skin head, use it to separate it from the insulation layer, and cut off the separated outer sheath with a blade to keep it neat and beautiful.

[0064] The glue removal in step seven specifically involves cutting off the excess optical fiber exposed in the front, installing the optical fiber head on the grinding fixture, and polishing it with glue-removing sandpaper to remove the glue on the ferrule head.

[0065] The main data in step 14 are specifically such as insertion loss and return loss. The insertion loss of single mode should be less than or equal to 0.3dB, and the return loss should be greater than or equal to 50dB.

[0066] In the present invention, the material selection and structural design of the new flat splitter are carried out. The flat end of the optical cable, the round cable end and the splitter need to be closely matched to maintain good waterproof performance. In terms of optical cable, the reasonable matching ratio of the core and the sleeve is adjusted, the extrusion temperature and speed of the sheath are controlled, the wall thickness and outer diameter of the optical cable sheath are accurately controlled, and the core drawing tube design solves the problem of adhesion between the central unit cable and the PE sheath. The technical indicators of this project are as follows:

[0067] Technical Parameters Performance Indicators Insertion loss(dB) Max: 0.3 Return loss(dB) Min: 60 Tensile index (N) Min:>68N

[0068] Prepare the corresponding wire cutting tools. Before stripping the wire, carefully observe the structure of the flat cable and identify the various parts of the cable, especially the insulation layer and the conductor. Through careful observation, better determine the stripping position to avoid damage to the wire inside the cable and perform wire stripping. Select the appropriate size of insulating sleeve and insert it into the exposed conductor to ensure that the insulating sleeve fully covers the conductor and fits tightly with the conductor. In order to improve the connection quality of the crimped terminal, appropriately reduce the lead-out distance, strip a length of the cable conductor under the insulating sleeve, and use wire strippers to trim the conductor according to the flat cable. Flat cable and the selected crimping connector model, use a screwdriver of appropriate size or special tools for crimping, and ensure that the screwdriver is tightened evenly to achieve a good electrical connection; put multiple optical fibers into a loose tube made of high modulus plastic filled with water-blocking composite, place reinforcements evenly outside the loose tube, and place two FRPs in parallel on both sides; put various loose parts on the optical fiber in advance, in the order of rubber sheath, heat shrink tube, support tube, spring, and pay attention to whether the direction is correct; use aramid scissors to cut the length of the optical cable as needed, and then simply coil it; use auxiliary tools to evenly mix Part A and Part B of 353nd glue in a ratio of 10:1, and inject glue after minimizing bubbles; put the ferrule with the optical fiber into the curing oven for baking until the 353nd glue is completely cured and the glue is removed; according to the flat cable and the selected crimping connector model, use a screwdriver of appropriate size or special tools for crimping. Make sure to tighten the screwdriver evenly to achieve a good electrical connection; grind the ferrule end face on the grinder, the general process is 9u, 3u, 1u, 0.05u; use the end inspection instrument with a magnification of 400 times to check the grinding effect of the ferrule end face, the end face with black spots or large scratches is considered unqualified and needs to be re-grinded; perform interferometer and interference fringes analysis on the product, the interferometer and interference fringes analysis evaluate the spherical radius and fiber height of the fiber connector end face, and first the shape of the connector end face must be measured. The interferometer has the advantages of high measurement, fast speed and low cost. It is an effective means to measure the surface shape. After the light emitted by the light source is reflected by the semi-mirror to the Mirow interference objective lens, the light is focused on the end face of the optical fiber connector to be tested. After the end face is reflected, the light reflected by the reflective surface of the Mirow interference objective lens passes through the semi-mirror together with the light reflected by the reflective surface of the Mirow interference objective lens, and the image is formed on the CCD camera. At this time, the interference fringes can be observed on the CCD camera. The image measured by the CCD camera is transmitted to the computer for analysis and processing via the image card.We get the measurement results we need. The PZT (piezoelectric ceramic assembly) controlled by the computer through the control card and the control loop is used to move the Miro interference objective lens to produce phase shift. The Fourier transform method 2, 3, 4 can be used to analyze the interference fringes, and the phase shift method 5, 6 can also be used. The Fourier transform method has the advantages of simplicity, speed and low cost, but it is relatively low and is generally used in simple measuring instruments. For the measurement of the end face shape of the optical fiber connector, the phase shift method with higher resolution is generally used. It must be pointed out that phase connection is a relatively complex process. Choosing different phase connection algorithms will have different calculation speeds and stability. The desktop MPO / MTP single-mode multimode jumper polarity detector performs polarity tests on products; the polished ferrules and loose parts are assembled into connectors, and the tail sleeves are crimped by crimping pliers or crimping machines; the main data of the optical fiber head is measured by the insertion-return loss tester, and the quality inspectors conduct random inspections on qualified products after the test to control the quality; the qualified products are finally packaged.

[0069] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pre-termination for indoor and outdoor introduction of a flat cable, comprising a flat cable body (1), characterized in that: The two ends of the flat cable body (1) are respectively fixedly mounted with an A-end flat multi-core splitter (2) and a B-end flat multi-core splitter (3); one side of the A-end flat multi-core splitter (2) and one side of the B-end flat multi-core splitter (3) are both fixedly connected with a plurality of branch lines (4); one side of the plurality of branch lines (4) are both fixedly connected with a connection assembly (5); one side of the plurality of connection assemblies (5) are both fixedly mounted with a joint assembly (6); the joint assembly (6) comprises a stress cone (64) and a flange (65); one end of the flange (65) is connected to one end of the stress cone (64); and the other end of the flange (65) is connected to a heat shrinkable sealing tube (67).

2. The pre-termination of an indoor and outdoor flat cable according to claim 1, characterized in that: Several of the connection components (5) include a first connection line (51), a retainer (52) and a second connection line (53); one end of the retainer (52) is connected to one end of the first connection line (51), and the other end of the retainer (52) is connected to one end of the second connection line (53); and a surface of the retainer (52) is provided with several grooves (54).

3. The pre-termination of an indoor and outdoor flat cable according to claim 2, characterized in that: One end of the first connecting line (51) away from the retainer (52) is connected to the branch line (4), and one end of the second connecting line (53) away from the retainer (52) is connected to the connector assembly (6).

4. The pre-termination of an indoor and outdoor flat cable according to claim 1, characterized in that: A watch chain contact (63) is installed on the side of the stress cone (64) away from the flange (65), a cone clamp (62) is fixedly installed on one side of the watch chain contact (63), and a sealing cover (61) is mounted on the surface of the cone clamp (62).

5. The pre-termination of an indoor and outdoor flat cable according to claim 1, characterized in that: A cable (66) is installed on the side of the heat shrinkable sealing tube (67) away from the flange (65), and one end of the cable (66) away from the heat shrinkable sealing tube (67) is connected to the connecting assembly (5).

6. A method for pre-termination of an indoor and outdoor flat cable according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Wire cutting: Prepare the corresponding wire cutting tools. Before stripping the wires, carefully observe the structure of the flat cable and identify the various parts of the cable, especially the insulation layer and the conductor. Through careful observation, better determine the stripping position to avoid damage to the wires inside the cable and perform wire stripping. Step 2: Make branches: Select an insulating sleeve of appropriate size and insert it into the exposed conductor, ensuring that the insulating sleeve fully covers the conductor and fits tightly with the conductor. To improve the connection quality of the crimping connector, appropriately reduce the lead-out distance, strip a length of the cable conductor under the insulating sleeve, and trim the conductor with a wire stripper. According to the flat cable and the selected crimping connector model, use a screwdriver of appropriate size or a special tool for crimping, ensuring that the screwdriver is tightened evenly to achieve a good electrical connection; Step 3: Fiber introduction: insert multiple optical fibers into a loose tube made of high modulus plastic filled with water-blocking composite, place reinforcements evenly outside the loose tube, and place two FRPs in parallel on both sides; Step 4: Thread the loose parts: Thread the various loose parts onto the optical fiber in advance, in the following order: rubber sheath, heat shrink tube, support tube, spring, and pay attention to whether the direction is correct; Step 5: Peel off the outer sheath: Use aramid scissors to cut the length of the optical cable as needed, and then simply coil it; Step 6: Glue injection: Use auxiliary tools to evenly mix Part A and Part B of 353nd glue in a ratio of 10:1, and inject the glue after minimizing bubbles; Step 7: Curing: Put the ferrule with the optical fiber into the curing oven and bake it until the 353nd glue is completely cured and removed; Step 8. Crimping: Use a screwdriver or special tool of appropriate size to crimp the flat cable and the selected crimping terminal model, making sure to tighten the screwdriver evenly to achieve a good electrical connection; Step 9, grinding: Grind the end face of the ferrule on a grinder. The general process is 9u, 3u, 1u, 0.05u; Step 10: End face inspection: Use an end inspection instrument with a magnification of 400 times to check the grinding effect of the ferrule end face. End faces with black spots or large scratches are considered unqualified and need to be re-grinded; Step 11, 3D interference detection: The product is subjected to interferometer and interference fringe analysis. The interferometer and interference fringe analysis evaluate the spherical radius and fiber height of the fiber connector end face. First, the shape of the connector end face must be measured. The interferometer has the advantages of high measurement, fast speed and low cost. It is an effective means to measure the surface shape. The light emitted by the light source is reflected by the semi-transparent mirror to the Mirow interference objective lens. The light is focused on the end face of the fiber connector to be tested. After being reflected by the end face, it passes through the semi-transparent mirror together with the light reflected by the reflective surface of the Mirow interference objective lens, and is imaged on the CCD camera. At this time, interference fringes can be observed on the CCD camera. The image measured by the CCD camera is The image card is sent to the computer for analysis and processing, and the measurement results we need are obtained. The PZT (piezoelectric ceramic component) controlled by the computer through the control card and the control loop is used to move the Miro interference objective lens to produce phase shift. The interference fringes can be analyzed by Fourier transform method 2, 3, 4, or phase shift method 5, 6. The Fourier transform method has the advantages of simplicity, speed and low cost, but it is relatively low and is generally used for simple measuring instruments. For the measurement of the end face shape of the optical fiber connector, the phase shift method with higher resolution is generally used. It must be pointed out that phase connection is a relatively complex process. Choosing different phase connection algorithms will result in different calculation speed and stability. Step 12: Polarity test: Use the desktop MPO / MTP single-mode and multi-mode patch cord polarity tester to test the polarity of the product; Step 13: Assemble: Assemble the ground ferrule and parts into a connector, and crimp the tail sleeve using crimping pliers or a crimping machine; Step 14: Finished product testing: Use the insertion loss tester to measure the main data of the optical fiber head, and the quality inspection personnel will conduct random inspections on qualified products after the test to control the quality; Step 15: Packaging: Final packaging of qualified products.

7. A method for pre-termination of indoor and outdoor flat cables according to claim 6, characterized in that: The wire cutting tools in step one specifically include wire strippers or wire stripping knives, wire stripping shears and other auxiliary tools. Make sure that these tools are clean, sharp and in good working condition. The wire cutting and stripping in step one specifically involves gently stripping the outer sheath. Use wire strippers or wire stripping knives to gently strip the outer sheath of the cable, keep your hands stable, use moderate force, and avoid cutting the internal wires. If more delicate operations are required, use a wallpaper knife to make scratches of a certain depth in the opposite direction of the head at the center position of both sides of the flat cable, and then use the wallpaper knife to cut longitudinally along the gap between the insulations of the two cores to separate the insulation from the insulation. Finally, use pliers to clamp the outer sheath head, use it to separate it from the insulation layer, and cut the separated outer sheath with a blade to keep it neat and beautiful.

8. A method for pre-termination of indoor and outdoor flat cables according to claim 6, characterized in that: The glue removal in step seven specifically includes cutting off the excess optical fiber exposed in the front, mounting the optical fiber head on a grinding fixture, and polishing it with glue-removing sandpaper to remove the glue on the ferrule head.

9. A method for pre-termination of indoor and outdoor flat cables according to claim 6, characterized in that: The main data in step fourteen are specifically such as insertion loss and return loss. The insertion loss of single mode should be less than or equal to 0.3dB, and the return loss should be greater than or equal to 50dB.

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