Dry-type RIP sleeve core winding paper stress test method based on optical fiber

Abstract

The invention relates to a dry-type RIP sleeve core winding paper stress test method based on an optical fiber. The method is characterized by comprising the following steps: S1, arranging the optical fiber; s2, connecting optical fibers; s3, leading out the optical fiber; s4, circulation of the core; an optical fiber is wound in winding paper of a core, and circulation production is carried out along with the whole core with the winding paper through an optical fiber layer structure; in this way, the core can be detected at any time in each process, and unqualified cores are prevented from flowing in the production process. In this way, on one hand, defective products can be picked out at any time, defective products are reduced, and the qualified rate of products is increased; on the other hand, defective products can be found in the production process as soon as possible, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of stress testing, and in particular to a dry RIP sleeve core winding paper stress testing method based on optical fiber. Background Art

[0002] After the core of epoxy resin impregnated paper dry-type casing is manufactured, it needs to go through processes such as drying, pouring, and curing. The axial shrinkage stress of the cured product is relatively large, and it is easy to cause the casing core to crack under the action of external forces such as subsequent core turning, assembly, and core pulling rods. In order to monitor the stress of the winding paper on the casing in real time during the production process and avoid testing after the core is produced, this delayed detection method cannot be detected at all during the product production process, resulting in increased production costs for the enterprise. Therefore, a winding paper stress test is needed, which can realize stress detection of the winding paper of the core in each process to avoid the problem of defective products circulating in the production process. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a dry RIP sleeve core winding paper stress testing method based on optical fiber, which can solve the problem that the stress generated by the traditional dry RIP sleeve core winding paper during the circulation process cannot be detected.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a dry RIP casing core winding paper stress test method based on optical fiber, and its innovation lies in: the specific test method is as follows: S1: Arrangement of optical fibers: the outer winding paper of the core is divided into several layers, and the winding paper of each layer is separated by a reversing optical fiber group, the circumferential optical fiber group includes a first circumferential optical fiber layer, a second circumferential optical fiber layer and a third circumferential optical fiber layer, and each circumferential optical fiber layer is provided with two circumferential optical fiber units; a plurality of winding paper layers are wound around the outer side of each circumferential optical fiber layer, and an axial optical fiber group is distributed along the axial direction of the core; the axial optical fiber group includes a first axial optical fiber layer, a second axial optical fiber layer and a third axial optical fiber layer, and each axial optical fiber layer has four axial optical fiber units evenly distributed along the circumference of the core; 2×3 circumferential optical fiber units and 4×3 axial optical fiber units are arranged on one core; S2: Fiber optic connection: S2.1: One of the optical fiber units in the first annular optical fiber layer is fusion-connected with the first optical fiber unit in the first axial optical fiber layer; another optical fiber unit in the first annular optical fiber layer is fusion-connected with the second optical fiber unit in the first axial optical fiber layer; the remaining third optical fiber unit in the first axial optical fiber layer is fusion-connected with the fourth optical fiber unit; S2.2: The fusion splicing method of the second circumferential optical fiber layer and the second longitudinal optical fiber layer is the same as S2.1; S2.3: One of the optical fiber units of the third annular optical fiber layer is fusion-connected with the first optical fiber unit and the second optical fiber unit in the third axial optical fiber layer; another optical fiber unit of the third annular optical fiber layer is fusion-connected with the third optical fiber unit and the fourth optical fiber unit in the third axial optical fiber layer; S3: Optical fiber lead-out: The optical fiber is led out from the core in three layers and connected to the demodulator respectively; S4: Core circulation: After the core is wound with optical fiber, it is hoisted and circulated in the workshop and sent into the vacuum tank. The core is then lifted out and checked with a red light pen to see if it is broken. A comprehensive inspection is conducted throughout the entire process of optical fiber laying and workshop circulation. If no optical fiber breakage or signal abnormality is found after inspection with a red light pen, it is considered as a composite process for the production and processing of the core.

[0005] Furthermore, in the S1 optical fiber layout, the bending radius of the pipeline needs to be increased in design at the vertical corners of the core; the bending radius position of the optical fiber is fixed with paper tape to avoid displacement while protecting the light; it is only fixed at the beginning and end of each circle, and it is ensured that these two positions are on the same axis to reduce the number of fixed points, and the optical fiber can be adjusted more smoothly during the layout process.

[0006] Furthermore, to verify that the optical fiber is broken at the end of the core: first, the optical fiber is placed loosely, and then the loose optical fiber is wound and scratches other angle areas of the end, causing the optical fiber to be obliquely tightened and break. The optimized verification method is: cut a small hole in the paper layer at the end of the core, stuff the optical fiber into this small hole, and smoothly transition to the front winding tube without being too tight or loose, so that the optical fiber can bypass the sharp corners of the end and avoid being directly subjected to stress concentration at the sharp corners.

[0007] Furthermore, verify the winding of the thick optical fiber: maintain the degree of contact between the optical fiber and the paper; avoid the mistaken belief that the thick optical fiber has a strong tensile strength during the optical fiber laying process, which leads to excessive tension during the laying process, especially shear force, causing invisible damage to the inside of the optical fiber or even breakage.

[0008] The advantages of the present invention are: 1) In the present invention, the optical fiber is wound in the winding paper of the core, and the optical fiber layer structure follows the entire core with the winding paper for circulation production; this ensures that the core can be inspected at any time in each process to prevent unqualified cores from circulating in the production process; on the one hand, this method can pick out defective products at any time, reduce the generation of defective products, and improve the qualified rate of products; on the other hand, it can also find defective products as soon as possible in the production process to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0010] Figure 1 This is a fiber layout diagram of a fiber-based dry RIP sleeve core winding paper stress test according to the present invention. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0012] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0013] like Figure 1 A dry RIP sleeve core winding paper stress test method based on optical fiber is shown, and the specific test method is as follows: S1: Arrangement of optical fibers: the outer winding paper of the core is divided into several layers, and the winding paper of each layer is separated by a reversing optical fiber group. The circumferential optical fiber group includes a first circumferential optical fiber layer, a second circumferential optical fiber layer and a third circumferential optical fiber layer, and each circumferential optical fiber layer is provided with two circumferential optical fiber units; a plurality of winding paper layers are wound around the outer side of each circumferential optical fiber layer, and an axial optical fiber group is distributed along the axial direction of the core; the axial optical fiber group includes a first axial optical fiber layer, a second axial optical fiber layer and a third axial optical fiber layer, and each axial optical fiber layer has four axial optical fiber units evenly distributed along the circumference of the core; 2×3 circumferential optical fiber units and 4×3 axial optical fiber units are arranged on one core; S2: Fiber optic connection: S2.1: One of the optical fiber units in the first annular optical fiber layer is fusion-connected with the first optical fiber unit in the first axial optical fiber layer; another optical fiber unit in the first annular optical fiber layer is fusion-connected with the second optical fiber unit in the first axial optical fiber layer; the remaining third optical fiber unit in the first axial optical fiber layer is fusion-connected with the fourth optical fiber unit; S2.2: The fusion splicing method of the second circumferential optical fiber layer and the second longitudinal optical fiber layer is the same as S2.1; S2.3: One of the optical fiber units of the third annular optical fiber layer is fusion-connected with the first optical fiber unit and the second optical fiber unit in the third axial optical fiber layer; another optical fiber unit of the third annular optical fiber layer is fusion-connected with the third optical fiber unit and the fourth optical fiber unit in the third axial optical fiber layer; S3: Optical fiber lead-out: The optical fiber is led out from the core in three layers and connected to the demodulator respectively; S4: Core circulation: After the core is wound with optical fiber, it is hoisted and circulated in the workshop and sent into the vacuum tank. The core is then lifted out and checked with a red light pen to see if it is broken. A comprehensive inspection is conducted throughout the entire process of optical fiber laying and workshop circulation. If no optical fiber breakage or signal abnormality is found after inspection with a red light pen, it is considered as a composite process for the production and processing of the core.

[0014] In the S1 optical fiber layout, the bending radius of the pipeline needs to be increased at the vertical corners of the core; the bending radius position of the optical fiber is fixed with paper tape to avoid displacement while protecting the light; it is only fixed at the beginning and end of each circle, and it is ensured that these two positions are on the same axis to reduce the number of fixed points, so that the optical fiber can be adjusted more smoothly during the layout process.

[0015] Verify that the optical fiber is broken at the end of the core: first, place the optical fiber loosely, and then wind the optical fiber loosely and scratch other angle areas at the end, causing the optical fiber to be obliquely tightened and break. The optimized way to verify is: cut a small hole in the paper layer at the end of the core, stuff the optical fiber into this small hole, and smoothly transition to the front winding tube without being too tight or loose, so that the optical fiber can bypass the sharp corners of the end and avoid being directly subjected to stress concentration at the sharp corners.

[0016] Verify the winding of the thick optical fiber: maintain the fit between the optical fiber and the paper; avoid the mistaken assumption that the thick optical fiber has a strong tensile strength during the optical fiber laying process, which may lead to excessive tension, especially shear force, during the laying process, causing invisible damage to the inside of the optical fiber or even breakage.

[0017] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements shall all fall within the scope of the present invention claimed for protection.

Claims

1. A method for testing stress of dry RIP casing core winding paper based on optical fiber, characterized in that: The specific test method is as follows: S1: Arrangement of optical fibers: the outer winding paper of the core is divided into several layers, and the winding paper of each layer is separated by a reversing optical fiber group, the circumferential optical fiber group includes a first circumferential optical fiber layer, a second circumferential optical fiber layer and a third circumferential optical fiber layer, and each circumferential optical fiber layer is provided with two circumferential optical fiber units; a plurality of winding paper layers are wound around the outer side of each circumferential optical fiber layer, and an axial optical fiber group is distributed along the axial direction of the core; the axial optical fiber group includes a first axial optical fiber layer, a second axial optical fiber layer and a third axial optical fiber layer, and each axial optical fiber layer has four axial optical fiber units evenly distributed along the circumference of the core; 2×3 circumferential optical fiber units and 4×3 axial optical fiber units are arranged on one core; S2: Fiber optic connection: S2.1: One of the optical fiber units in the first annular optical fiber layer is fusion-connected with the first optical fiber unit in the first axial optical fiber layer; another optical fiber unit in the first annular optical fiber layer is fusion-connected with the second optical fiber unit in the first axial optical fiber layer; the remaining third optical fiber unit in the first axial optical fiber layer is fusion-connected with the fourth optical fiber unit; S2.2: The fusion splicing method of the second circumferential optical fiber layer and the second longitudinal optical fiber layer is the same as S2.1; S2.3: One of the optical fiber units of the third annular optical fiber layer is fusion-connected with the first optical fiber unit and the second optical fiber unit in the third axial optical fiber layer; another optical fiber unit of the third annular optical fiber layer is fusion-connected with the third optical fiber unit and the fourth optical fiber unit in the third axial optical fiber layer; S3: Optical fiber lead-out: The optical fiber is led out from the core in three layers and connected to the demodulator respectively; S4: Core circulation: After the core is wound with optical fiber, it is hoisted and circulated in the workshop and sent into the vacuum tank. The core is then lifted out and checked with a red light pen to see if it is broken. A comprehensive inspection is conducted throughout the entire process of optical fiber laying and workshop circulation. If no optical fiber breakage or signal abnormality is found after inspection with a red light pen, it is considered as a composite process for the production and processing of the core.

2. The method for testing stress of dry RIP sleeve core winding paper based on optical fiber according to claim 1, characterized in that: In the S1 optical fiber layout, the bending radius of the pipeline needs to be increased at the vertical corner of the core; the bending radius position of the optical fiber is fixed with paper tape to avoid displacement while protecting the light; it is only fixed at the beginning and end of each circle, and it is ensured that these two positions are on the same axis to reduce the number of fixed points, and the optical fiber can be adjusted more smoothly during the layout process.

3. The method for testing stress of dry RIP sleeve core winding paper based on optical fiber according to claim 1, characterized in that: Verify that the optical fiber is broken at the end of the core: first, place the optical fiber loosely, and then wind the optical fiber loosely and scratch other angle areas at the end, causing the optical fiber to be obliquely tightened and break. The optimized way to verify is: cut a small hole in the paper layer at the end of the core, stuff the optical fiber into this small hole, and smoothly transition to the front winding tube without being too tight or loose, so that the optical fiber can bypass the sharp corners of the end and avoid being directly subjected to stress concentration at the sharp corners.

4. The method for testing stress of dry RIP sleeve core winding paper based on optical fiber according to claim 1, characterized in that: Verify the winding of the thick optical fiber: maintain the fit between the optical fiber and the paper; avoid the mistaken assumption that the thick optical fiber has a strong tensile strength during the optical fiber laying process, which may lead to excessive tension, especially shear force, during the laying process, causing invisible damage to the inside of the optical fiber or even breakage.

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