CN113358453B - Preparation device and method of sample for cable sheath appearance measurement and testing method - Google Patents
Preparation device and method of sample for cable sheath appearance measurement and testing method Download PDFInfo
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- CN113358453B CN113358453B CN202110685054.6A CN202110685054A CN113358453B CN 113358453 B CN113358453 B CN 113358453B CN 202110685054 A CN202110685054 A CN 202110685054A CN 113358453 B CN113358453 B CN 113358453B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/364—Embedding or analogous mounting of samples using resins, epoxy
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Abstract
The invention discloses a preparation device, a preparation method and a test method of a sample for measuring the appearance of a cable sheath. The device comprises: an outer sheath holder, and a resin container provided with one or more of the outer sheath holders. The sample preparation method comprises the following steps: (1) embedding and fixing; (2) and (4) slicing the sample. The testing method comprises the steps of imaging a smooth and flat section of a sample for measuring the appearance of the cable sheath, and analyzing the image containing the cross section of the sheath sample to obtain the appearance parameter of the cable sheath. According to the sample preparation method provided by the invention, the sample is embedded, so that the serious deformation of the outer sheath sample of the core-removing cable during cutting processing is avoided, and the measurement of the thickness and the overall dimension of the sheath is carried out on the basis of not damaging the original appearance of the sample.
Description
Technical Field
The invention belongs to the technical field of cable sheath structure dimension testing, and particularly relates to a preparation device, a preparation method and a testing method of a sample for cable sheath appearance measurement.
Background
Due to the wide variety of cable products, products with different uses and sheathing materials, the texture has great difference in hardness. For testing of cable sheath thickness and outer dimensions, the conventional method is to perform the test according to section 8 of GB/T2951.11-2008 by manually cutting a thin sheet in the axial direction with a sharp blade or the like. For a sample with a softer material, the original state of the sample is destroyed in the cutting process, so that a large error exists in a test result, and the thickness and the overall dimension of the sample cannot be truly and accurately tested. In addition, if a vernier caliper is used for testing, the clamping force of a tester is different from person to person, so that the result deviation is caused; if a microscope or a projector is used for testing, the boundary of the sample cut by the direct blade in the projection state is difficult to select, and the deviation of the result is brought.
Especially for the type of sheath embedded with the support member, the sheath may be severely deformed due to the large external force applied to cut the support member, and the size of the cut may not accurately reflect the external size of the sheath.
Disclosure of Invention
Aiming at the defects or the improvement requirements in the prior art, the invention provides a preparation device, a preparation method and a test method of a sample for measuring the appearance of a cable sheath, and aims to avoid sheath deformation caused by cutting of a sheath sample through embedding and fixing, so that the sheath sample with good machining performance is obtained, the appearance size of an outer sheath is accurately reflected, and the technical problem that the cut size cannot accurately reflect the appearance size of the outer sheath in a natural state due to deformation of the outer sheath sample in cutting in the prior art is solved.
To achieve the above object, according to one aspect of the present invention, there is provided a sample preparation apparatus for measuring a profile of a cable sheath, comprising: an outer sheath clamp and a resin container, wherein the resin container is provided with one or more outer sheath clamps;
the outer sheath clamping piece is a coiling reed, the side edge of the outer sheath clamping piece is coiled to form the bottom surface of the outer sheath clamping piece, the bottom surface in the resin container is horizontal, and the bottom surface of the outer sheath clamping piece is supported; the outer sheath clamping piece reed is perpendicular to the bottom surface of the outer sheath clamping piece, and the center of the reed is clamped and fixed with the lower part of the sheath sample of the cable removing core in an elastic deformation self-adaptive mode, so that the sheath sample of the cable removing core is vertically located in the resin container.
Preferably, the height of the reed of the preparation device of the sample for measuring the appearance of the cable sheath is 1/3-1/2 of the sheath sample height of the cable removing core.
Preferably, in the apparatus for preparing the sample for measuring the outer shape of the cable sheath, the resin container is an insert mold and is made of a silicone rubber material or a polyoxymethylene resin material.
Preferably, the resin container of the apparatus for preparing a sample for measuring the outer shape of a cable sheath has a circular or square shape.
According to another aspect of the present invention, there is provided a method for preparing a sample for measuring the profile of a cable jacket, comprising the steps of:
(1) embedding and fixing: vertically inserting the sheath sample with the cable core removed into epoxy resin, and obtaining a sheath sample embedded by the epoxy resin after the epoxy resin is completely cured;
(2) slicing a sample: and (3) cutting the sheath sample embedded by the epoxy resin obtained in the step (1) into slices along the cross section of the sheath, polishing the cut surfaces to be smooth and flat, and obtaining the sample slices as the sample for measuring the appearance of the cable sheath.
Preferably, in the preparation method of the sample for measuring the appearance of the cable sheath, the epoxy resin is bisphenol a epoxy resin, the viscosity of the epoxy resin is preferably 200-1200 mPa · s by adding an accelerator, the normal-temperature curing time is 0.5-4 hours, the light transmittance after curing is more than or equal to 50%, and the shore hardness is not less than 60 HD.
Preferably, in the preparation method of the sample for measuring the appearance of the cable sheath, the embedding and fixing are carried out in the step (1) under the vacuum negative pressure condition, the vacuum degree is not less than 800mbar, and the vacuum maintaining time is about 1-2 min.
Preferably, the thickness of the sample slice of the preparation method of the sample for measuring the appearance of the cable sheath is 1-5 mm.
Preferably, the preparation method of the sample for measuring the appearance of the cable sheath is prepared by adopting the preparation device of the sample for measuring the appearance of the cable sheath provided by the invention;
wherein, the step (1) is specifically as follows: fixing a sheath sample of a cable removing core in the center of a reed of a preparation device of the sample for measuring the appearance of the cable sheath, so that the upper part of the sheath sample without clamping the cable removing core is kept in a natural state, filling resin in a resin container, vertically inserting the sheath sample of the cable removing core into epoxy resin, and obtaining a sheath sample embedded by the epoxy resin after the epoxy resin is completely cured;
the step (2) is specifically as follows: and (3) cutting the sheath sample embedded by the epoxy resin obtained in the step (1) into slices parallel to the bottom surface of the outer sheath clamping piece along the reed position, polishing the cutting surface to be smooth and flat, and obtaining the sample slices as the sample for measuring the appearance of the cable sheath.
According to another aspect of the present invention, there is provided a cable sheath profile measuring method, comprising the steps of:
imaging the smooth and flat section of the sample for measuring the appearance of the cable sheath prepared by the method provided by the invention to obtain an image containing the cross section of the sheath sample; preferably, a projector or a microscope is adopted to image the smooth and flat section of the sample for measuring the appearance of the cable sheath;
and analyzing the image containing the sheath sample cross section to obtain the cable sheath appearance parameter. In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
according to the sample preparation method provided by the invention, the sample is embedded, so that the serious deformation of the outer sheath sample of the core-removing cable during cutting processing is avoided, and the measurement of the thickness and the overall dimension of the sheath is carried out on the basis of not damaging the original appearance of the sample. For special-shaped samples (such as oval, triangular, flat, zigzag and the like), samples which are easy to deform when being cut and have soft texture and samples which contain reinforcing cores in sheaths, the method well solves the problem that the measurement of the thickness and the external dimension of the sheaths is difficult.
According to the preferable scheme, the epoxy resin with good optical performance and machining performance is adopted for embedding, the vacuum glue pouring is adopted in a matched mode, bubbles in the solvent are effectively removed, the boundary of the prepared sample is clear, the test result is real and reliable, and the prepared sample is easy to observe.
According to the preferable scheme, a plurality of samples are placed in the die, and the size of the samples is measured by adopting image analysis, so that standardized sample preparation and batch automatic measurement can be realized.
The sample preparation device for cable sheath appearance measurement can ensure that the aerial posture of a core-removing outer sheath sample in an epoxy resin-embedded sheath sample is vertical, further ensure that the section is the cross section of the core-removing outer sheath sample when the sample is cut and processed, avoid the outer sheath dimension measurement error caused by the deflection of the section, improve the measurement precision and ensure the measurement standardization.
Drawings
FIG. 1 is a schematic structural diagram of an outer sheath clamping member of a sample preparation device for measuring the appearance of a cable sheath provided by the invention;
fig. 2 is an image photograph of a sample for measuring the profile of a cable sheath prepared according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a preparation method of a sample for measuring the appearance of a cable sheath, which comprises the following steps:
(1) embedding and fixing: vertically inserting the sheath sample with the cable core removed into epoxy resin, and obtaining a sheath sample embedded by the epoxy resin after the epoxy resin is completely cured;
the epoxy resin is preferably bisphenol A epoxy resin, the viscosity of the epoxy resin is preferably 200-1200 mPa & s by adding an accelerator, the normal-temperature curing time is 0.5-4 hours, the light transmittance after curing is more than or equal to 50%, and the Shore hardness is not less than 60 HD. The accelerator is an organic solvent such as polybutadiene peroxide, and changes the viscosity and the curing time of the resin;
in order to realize batch measurement, the prepared sample for measuring the appearance of the cable sheath needs to have good imaging performance so as to realize machine vision detection. The imaging effect is affected by the light transmittance and the machining performance of the cured resin, and if the light transmittance is low or the machining performance is poor and an optical flat surface is difficult to obtain, a sample which can be used for machine vision image analysis cannot be obtained. The hardness and light transmittance of the epoxy resin are critical to subsequent testing.
According to the invention, bisphenol A epoxy resin is selected as an embedding agent, the filling performance is good through testing, and the bisphenol A epoxy resin can be well filled in various embedding agent selections no matter natural infiltration or vacuum negative pressure embedding is adopted; meanwhile, the curing time is short, the heat generated in the curing process is less, and the natural state of the sample cannot be influenced; the sheath sample obtained after curing has certain optical transparency and enough hardness, is convenient to grind and can be easily processed into an optical flat surface.
Embedding and fixing are preferably carried out under the vacuum negative pressure condition; in order to eliminate bubbles generated in the mixing and glue pouring processes, avoid influencing the observation and measurement effects after curing, and improve the optical performance of the sample slice, the embedding and fixing process in the step (1) of the mixing process of adding an accelerant into the epoxy resin is preferably carried out, and the vacuum degree is not less than 800 mbar; maintaining the vacuum for about 1-2 min.
(2) Slicing a sample: cutting the sheath sample embedded by the epoxy resin obtained in the step (1) into slices along the cross section of the sheath, and polishing the cut surfaces to be smooth and flat to obtain sample slices serving as samples for measuring the appearance of the cable sheath; the thickness of the sample slice is 1-5 mm.
According to the preparation method of the sample for measuring the appearance of the cable sheath, the prepared sample for measuring the appearance of the cable sheath is embedded and fixed by the proper epoxy resin, so that the natural state of the sheath is maintained and the sheath is not deformed, and the real size of the sheath can be accurately reflected even if the sheath is subjected to subsequent cutting and grinding. Particularly, the epoxy resin with good optical performance is selected and embedded under the condition of vacuum negative pressure, so that the problems of poor imaging effect or difficulty in adapting to an automatic image analysis algorithm caused by a large amount of bubbles are solved, and the obtained sample for measuring the appearance of the cable sheath can be directly used for imaging measurement, particularly microscopic imaging measurement, so that the accurate, automatic and high-flux outer sheath appearance measurement can be realized.
The invention provides a cable sheath appearance measuring method based on the method, which comprises the following steps:
imaging a smooth and flat section of a sample for measuring the appearance of the cable sheath prepared by the method provided by the invention to obtain an image containing the cross section of the sheath sample; the smooth and flat cut surface of the cable sheath profile measurement sample is preferably imaged using a projector or microscope.
And analyzing the image containing the sheath sample cross section to obtain the cable sheath appearance parameter.
In the invention, the premise of ensuring the measurement accuracy is to ensure that the cross section of the sample is accurately obtained, and the aerial posture of the outer sheath sample in the epoxy resin embedded sheath sample and the angle of the outer sheath sample relative to the epoxy resin embedded sheath sample during cutting are controlled, so that the precision of the measurement result is crucial.
In order to ensure the vertical state of a sheath sample embedded in epoxy resin and the vertical state of the sheath sample, the invention provides a preparation device of a sample for measuring the appearance of a cable sheath, which comprises the following components: an outer sheath clamp and a resin container, wherein the resin container is provided with one or more outer sheath clamps;
the outer sheath clamping piece is a coiling reed, the side edge of the outer sheath clamping piece is coiled to form the bottom surface of the outer sheath clamping piece, the bottom surface in the resin container is horizontal, and the bottom surface of the outer sheath clamping piece is supported; the outer sheath clamping piece reed is perpendicular to the bottom surface of the outer sheath clamping piece, and the center of the reed is clamped and fixed with the lower part of the sheath sample of the cable removing core in a self-adaptive mode through elastic deformation, so that the sheath sample of the cable removing core is vertically arranged in the resin container; the reed height is 1/3 to 1/2 of the sheath sample height of the cable-removal core.
The reed is used as the outer sheath clamping piece and is a reed, the clamping force is small, and the sheath sample of the cable removing core is fixed in the center of the reed, so that the upper part of the sheath sample which is not clamped with the cable removing core is kept in a natural state; on the other hand, the reed has certain elasticity and can adapt to samples with different sizes. The sheath sample of the cable removing core is arranged in a fixed reed and vertically placed in a resin container for glue filling. And after solidification, cutting the reed into slices from the position of the reed parallel to the bottom surface of the reed, thereby ensuring that the section is the cross section of the sheath sample of the cable-removing core, further ensuring that the sample slices can correctly reflect the size of the cross section of the sheath sample of the cable-removing core, reserving the sample end for grinding, and finally obtaining the sample slices.
Preferably, the resin container is round or square, and can adopt an insert mold made of a silicon rubber material or a polyformaldehyde resin material.
Currently, no method for measuring the size of the jacket after curing using a solvent is known in the industry. The metallographic phase sample preparation after the solvent is solidified is seen in other industries, and the bubbles and the removal mode generated in the solvent preparation process are not considered. Therefore, the testing method of the invention makes up the defects in the testing and sample preparation processes, the cured sample has no bubbles, the prepared sample has clear boundary, and the method can realize standardized and batch measurement with real and reliable results.
The following are examples:
a preparation method of a sample for measuring the appearance of a cable sheath comprises the following steps:
(1) embedding and fixing: vertically inserting the sheath sample with the cable core removed into epoxy resin, and obtaining a sheath sample embedded by the epoxy resin after the epoxy resin is completely cured;
removing the sheath sample of the cable core: cutting a section of sample of about 100m from a sample cable, putting the sample into a cutting machine, and cutting a sample to be measured which is 20mm long and has two flat ends; and removing the cable core in the sample to be detected, only leaving the outer sheath, placing the sample with the removed cable core on sand paper, polishing the two ends of the sample to be detected smoothly, selecting 180# sand paper, cooling the end face in the polishing process by water to avoid heating, and obtaining the sheath sample with the removed cable core. The sample may be cut by a cutter or by an alternative tool.
Selecting a cylindrical soft plastic mould with the internal space size of phi 30mm by 20mm as a resin container, using a reed with the height of 7mm as an outer sheath clamping piece, and fixing a sheath sample of the cable removing core at the center of the reed so that the upper part of the sheath sample which is not clamped with the cable removing core is kept in a natural state; and vertically placing the reed of the sheath sample with the cable-removing core in a cylindrical silica gel embedding mold, and keeping the bottom surface of the reed tightly attached to the plastic mold.
Mixing fast epoxy resin (model: CM3) and polybutadiene peroxide curing agent at a ratio of 2.5:1, and stirring for 2 min; putting the mould and the prepared curing adhesive into a vacuum pump, and starting up the vacuum pump for vacuumizing; pouring the curing glue into a mold with a sample, immersing the sample, and closing the vacuum pump after air bubbles in the curing glue are exhausted; the prepared mold sample was left at normal temperature for about 2 hours to be completely cured, and then taken out.
(2) Slicing a sample: cutting the sheath sample embedded by the epoxy resin obtained in the step (1) into slices along the cross section of the sheath, and polishing the cut surfaces to be smooth and flat to obtain sample slices serving as samples for measuring the appearance of the cable sheath; the method comprises the following specific steps:
the bottom surface of the outer sheath clamping piece, namely the bottom surface of the sheath sample embedded by epoxy resin, is vertically arranged in the embedding container, so that the section can be better ensured to be the cross section of the sheath as long as the section is ensured to be parallel to the bottom surface of the sheath sample.
Placing the 10mm slices on a grinding machine, firstly selecting 180# abrasive paper for grinding, then selecting 1200# abrasive paper for grinding, and cooling by adding water in the grinding process until the surface of the sample is smooth, flat and transparent; the thickness of the sample after polishing was about 5mm, and a sample for measuring the outer shape of the cable sheath was obtained.
The cable sheath appearance measuring method comprises the following steps: the sample for measuring the appearance of the cable sheath is placed under a projector for imaging, as shown in figure 2, the thickness and the appearance size are measured, and automatic and batch analysis can also be carried out by adopting image analysis software.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. A preparation device of a sample for measuring the appearance of a cable sheath is characterized by comprising: an outer sheath clamp and a resin container, wherein the resin container is provided with one or more outer sheath clamps;
the outer sheath clamping piece is a coiling reed, the side edge of the outer sheath clamping piece is coiled to form the bottom surface of the outer sheath clamping piece, the bottom surface in the resin container is horizontal, and the bottom surface of the outer sheath clamping piece is supported; the outer sheath clamping piece reed is perpendicular to the bottom surface of the outer sheath clamping piece, and the center of the reed is clamped and fixed with the lower part of a sheath sample of the cable removing core in an elastic deformation self-adaptive mode, so that the sheath sample of the cable removing core is vertically located in the resin container.
2. The apparatus for preparing a sample for measuring the profile of a cable jacket according to claim 1, wherein the reed height is 1/3 to 1/2 of the jacket sample height of the cable-excluding core.
3. The apparatus for preparing a sample for measuring the outer shape of a cable sheath according to claim 1, wherein the resin container is an insert mold and is made of a silicone rubber material or a polyoxymethylene resin material.
4. The apparatus for preparing a sample for measuring the profile of a cable sheath according to claim 1, wherein the resin container has a circular or square shape.
5. A preparation method of a sample for measuring the appearance of a cable sheath is characterized by comprising the following steps:
(1) embedding and fixing: vertically inserting the sheath sample with the cable core removed into epoxy resin, and obtaining a sheath sample embedded by the epoxy resin after the epoxy resin is completely cured;
(2) slicing a sample: and (3) cutting the sheath sample embedded by the epoxy resin obtained in the step (1) into slices along the cross section of the sheath, polishing the cut surfaces to be smooth and flat, and obtaining the sample slices as the sample for measuring the appearance of the cable sheath.
6. The method for preparing a sample for measuring the outer shape of a cable sheath according to claim 5, wherein the epoxy resin is bisphenol A epoxy resin, and the viscosity is 200 to 1200 mPa-s, the curing time at normal temperature is 0.5 to 4 hours, the light transmittance after curing is 50% or more, and the Shore hardness is not less than 60HD by adding an accelerator.
7. The method for preparing the sample for measuring the appearance of the cable sheath according to claim 5, wherein the embedding and fixing are carried out in the step (1) under the vacuum negative pressure condition, the vacuum degree is not less than 800mbar, and the vacuum maintaining time is 1-2 min.
8. The method for preparing a sample for measuring the profile of a cable sheath according to claim 5, wherein the sample slice has a thickness of 1 to 5 mm.
9. The method for preparing a sample for measuring the outer shape of a cable sheath according to claim 5, characterized by preparing with the sample preparation apparatus for measuring the outer shape of a cable sheath according to any one of claims 1 to 4;
wherein, the step (1) is specifically as follows: fixing a sheath sample of a cable removing core in the center of a reed of a preparation device of the sample for measuring the appearance of the cable sheath, so that the upper part of the sheath sample without clamping the cable removing core is kept in a natural state, filling resin in a resin container, vertically inserting the sheath sample of the cable removing core into epoxy resin, and obtaining a sheath sample embedded by the epoxy resin after the epoxy resin is completely cured;
the step (2) is specifically as follows: and (3) cutting the sheath sample embedded by the epoxy resin obtained in the step (1) into slices parallel to the bottom surface of the outer sheath clamping piece along the reed position, polishing the cutting surface to be smooth and flat, and obtaining the sample slices as the sample for measuring the appearance of the cable sheath.
10. A cable sheath appearance measuring method is characterized by comprising the following steps:
imaging a smooth and flat cut surface of a sample for cable sheath profile measurement prepared according to the method of any one of claims 5 to 9, obtaining an image comprising a cross section of the sheath sample;
and analyzing the image containing the sheath sample cross section to obtain the cable sheath appearance parameter.
11. The cable jacket profile measuring method of claim 10, wherein said obtaining an image containing a cross-section of said jacket sample is:
and imaging the smooth and flat section of the sample for measuring the appearance of the cable sheath by adopting a projector or a microscope.
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Effective date of registration: 20220622 Address after: No.9, Guanggu Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430074 Patentee after: YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK Ltd. Patentee after: Sichuan Lefei Photoelectric Technology Co., Ltd Address before: No.9, Guanggu Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430074 Patentee before: YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK Ltd. |