CN108362515B - Slicing improvement method based on crosslinked cable slicer - Google Patents
Slicing improvement method based on crosslinked cable slicer Download PDFInfo
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- CN108362515B CN108362515B CN201810084036.0A CN201810084036A CN108362515B CN 108362515 B CN108362515 B CN 108362515B CN 201810084036 A CN201810084036 A CN 201810084036A CN 108362515 B CN108362515 B CN 108362515B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000006872 improvement Effects 0.000 title claims abstract description 7
- 229920003020 cross-linked polyethylene Polymers 0.000 claims abstract description 22
- 239000004703 cross-linked polyethylene Substances 0.000 claims abstract description 22
- 238000005520 cutting process Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims description 5
- 238000009413 insulation Methods 0.000 abstract description 5
- 230000032683 aging Effects 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000282994 Cervidae Species 0.000 description 1
- 241000052343 Dares Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
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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
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/06—Devices for withdrawing samples in the solid state, e.g. by cutting providing a thin slice, e.g. microtome
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a slicing improvement method based on a cross-linked cable slicer, which comprises the following steps: selecting a cross-linked polyethylene cable to be sliced, and stably fixing the cross-linked polyethylene cable on a slicing machine; firstly, slicing one side of the cable, and then converting a certain angle to enable the cable insulation layer to be in a trapezoidal shape; and slicing the top end of the trapezoidal insulating layer of the cable according to a slicer measuring scale. The method of the invention avoids the problem that the blade is warped due to overlarge stress in the cutting process or the cable is arched due to loose clamping so as to reduce the precision by reducing the contact length of the blade of the slicer and the crosslinked polyethylene insulating layer, and the method also effectively reduces the damage of the sample to the blade.
Description
Technical Field
The invention relates to the technical field of experimental sampling of crosslinked polyethylene cables, in particular to a slicing improvement method based on a crosslinked cable slicer.
Background
The crosslinked polyethylene (XLPE) has excellent electrical performance, good thermal performance and mechanical performance, and can be widely applied to medium and low voltage power transmission engineering and high voltage and ultrahigh voltage power transmission systems. At present, the insulation performance of the related cable which reaches the designed service life is detected to be good, the related parameters still reach the standard requirements and can still continue to operate, but due to the lack of related theoretical argument and a large amount of experimental research, a power grid operation department still dares not to allow the cable to operate for a longer time. For cables which have been operated for a long time, related physicochemical experiments are carried out in order to know the aging degree of the cables, aging analysis is based on comparison of aging characteristic quantities, the most effective characteristic quantity is the physicochemical quantity of the cable insulation layer, and for the microscopic or submicroscopic characteristic quantities, the analysis can be carried out only by slicing the cables. In addition, the accelerated aging test is also one of the important ways for analyzing the insulating material, and the slicing step of the sample cannot be separated from the electrical aging and the thermal aging of the sample.
For most of physical and chemical experiments and accelerated aging tests, certain requirements are imposed on the thickness of a sample, for example, the thickness of the sample is definite for the space charge measurement of crosslinked polyethylene and the accelerated electrical aging test; for Differential Scanning Calorimetry (DSC) among thermal analysis methods, the thinner the sample thickness, the more accurate the peak temperature value can be obtained. Therefore, how to obtain a more accurate thickness of the crosslinked polyethylene sample is crucial to the influence of later experiments.
For the existing slicer, the principle and the operation are simple, but the precision is far from meeting the requirement. Cables of 110kV and above class have two major problems due to the large cross-sectional area and the thick insulation thickness, as per the original slicing method: 1. thicker samples cannot be obtained, otherwise the blade will break. 2. Thinner samples cannot be obtained because the blade will be lifted by the wide insulating layer and no sample can be cut. The method is most reasonable by comprehensively considering factors such as the experiment cost of replacing the equipment, the experiment precision and the like, and finally obtaining the sample with more accurate precision by slightly changing the original slicing method of the slicing machine.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a slicing improvement method based on a cross-linked cable slicer, which can improve the thickness precision of a cross-linked polyethylene sample and reduce errors brought by the sample in later experiments.
The purpose of the invention is realized by the following technical scheme: a slicing improvement method based on a cross-linked cable slicer comprises the following steps:
1. selecting a cross-linked polyethylene cable to be sliced, and horizontally fixing the cross-linked polyethylene cable at a slicer;
2. adjusting a slicer to rotate a lifting scale hand wheel, controlling the blade to just contact the outer semi-conducting layer, then dragging out the cable to a position where the blade cannot contact, adjusting the slicer to rotate the lifting scale to enable the blade to move downwards, and slicing; firstly, slicing the crosslinked polyethylene cable on one side to reach the inner layer of the insulating layer;
3. rotating the crosslinked polyethylene cable by a certain angle, continuously cutting the cable according to the method in the step 2, and obtaining a trapezoid-like shape with two sides cut into straight lines, an upper short arc and a lower long arc from the perspective of the cross section of the cable;
4. the upper edge of the trapezoid is placed in parallel with the blade, after the trapezoid is fixed, the rotary lifting scale hand wheel is adjusted to accurately cut the cable, and a required sample is obtained.
Preferably, in step 2, the thickness of each slice should not exceed 2 mm.
Preferably, step 2 specifically comprises: adjust the rotatory lift scale hand wheel of slicer earlier, make the blade just contact the surface of the outer semi-conducting layer of cable, drag the cable far to the unable contact position of blade, adjust 5 big check of the rotatory lift scale hand wheel of slicer and make the blade move down 1mm, then the cutting is carried out to the rotatory start button, after having cut the sample once, remember the reading of scale hand wheel this moment, upward move the blade slightly and take out the in-process with the cable and damage the blade, then rotatory lift scale hand wheel 5 big check on the reading basis of writing down, make the blade down 1mm again, repeat this process until cutting the insulating layer inlayer.
Preferably, in step 3, the accuracy of the width and thickness of the slice is determined by adjusting the length of the upper side of the trapezoid, and the accuracy is higher as the length is shorter.
Further, the length of the upper side length of the trapezoid-like shape is adjusted by controlling the angle of the rotating cable, and the length of the upper side length of the trapezoid-like shape is shorter as the rotating angle is smaller.
Further, a minimum angle threshold for rotating the cable is determined according to experimental requirements.
Preferably, the cable is repeatedly cut according to the desired sample thickness in step 4.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the method solves the problem that the blade of the slicing machine is warped due to overlarge stress in the cutting process or the cable is not clamped tightly so as to reduce the precision by reducing the contact length of the blade and the crosslinked polyethylene insulating layer; the thickness precision of the sample is greatly improved on the premise of not replacing the original cross-linked polyethylene slicer, and the sample as thin as possible can be obtained.
2. The method reduces the contact area between the blade and the insulating layer, effectively reduces the damage of the sample to the blade and protects the blade.
Drawings
FIG. 1 is a schematic diagram of an example method cut.
FIG. 2 is a ladder diagram of an insulating layer after dicing according to an embodiment of the method.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
According to the experimental requirements: a 0.4mm sample of the desired cable was obtained close to the inner insulation. The range of the experimental slicer is 5 grids which are 1mm, and a slice of 0.4mm can be obtained by adjusting 2 grids.
1. Selecting a 110kV crosslinked polyethylene cable which runs for 15 years on a Japanese Sumitomo deer repair wire coil as a slicing object, cutting the cable, and removing an outer sheath to obtain a structure of a three-layer extrusion molding part with a conductor of about 15cm in length.
2. Fix tightly on the crosslinked polyethylene slicer with foretell cable, adjust the rotatory lift scale hand wheel of slicer earlier, make the blade just contact the surface of the outer semi-conducting layer of cable, the manual cable of dragging away to the unable contact position of blade, adjust the big check of the rotatory lift scale hand wheel of slicer 5 and make the blade down move about 1mm, then rotatory start button cuts, after having cut the sample once, remember the reading of scale hand wheel this moment, upward move the blade slightly so that the cable takes out the in-process and damage the blade, then rotatory lift scale hand wheel 5 big check on the reading basis of writing down, make the blade down 1mm again, repeat this process until cutting the insulating layer inlayer.
3. And (3) loosening the fixation of the cable, rotating the cable to a certain angle, then tightly fixing the cable, and repeating the step (2) to obtain the cable with a trapezoid-like shape from the perspective of the cable section, as shown in fig. 2. The length of the upper side of the trapezoid determines the accuracy of the thickness, and the shorter the length, the higher the accuracy, the smaller the angle of the rotating cable, the higher the accuracy, but when the angle of the rotation is too small, the width of the obtained sample is too narrow, and the angle of the rotating cable is determined according to the requirements of the experiment.
4. Loosening the fixation of cable once more, place trapezoidal higher authority and blade parallel, fixed back, adjust rotatory lift scale hand wheel and cut the cable earlier, treat to cut the part that is close to inside, begin accurate cutting, rotatory lift scale hand wheel 2 big check on the basis of the last reading of noting, start the slicer and cut, just obtain theoretically for 0.4 mm's section, the reading of scale hand wheel this moment is noted, drag the cable apart to the unable contact position of blade after upwards moving the blade slightly, adjust the rotatory lift scale hand wheel 2 big check of slicer on the basis of last reading and make the blade move down about 0.4mm, continue to cut, repeat this process and obtain many samples.
The trapezoidal cross-linked polyethylene layer is sliced according to the required thickness, so that the contact length between the blade and the insulating layer is effectively reduced, the blade cannot be warped or the sample cannot be arched due to loose clamping, the precision of the slice thickness is improved, and in addition, the repeated cutting caused by the sample cannot be cut due to the fact that the slice thickness is not too thin in the slicing process, so that the damage to the blade is reduced.
5. If the slice is still too thick, the rotation angle of step 3 is reduced on the basis of the cable. Thus, the upper edge length of the trapezoidal shape of the insulating layer is reduced, and the stress of the blade is reduced in the cutting process, so that a thinner sample can be obtained.
6. The samples obtained above are measured one by a vernier caliper, and the samples meeting the specification are selected.
1) The angle of the conversion cable is determined according to the width and the accuracy of the required sample; 2) the thickness of the cut is determined by the contact length of the blade and the insulating layer and the precision of the slicer.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. A slicing improvement method based on a cross-linked cable slicer is characterized by comprising the following steps:
s1, selecting a cross-linked polyethylene cable to be sliced, and horizontally fixing the cross-linked polyethylene cable at a slicer;
s2, adjusting the slicer to rotate a lifting scale hand wheel, controlling the blade to just contact the outer semi-conducting layer, then dragging out the cable to a position where the blade cannot contact, adjusting the slicer to rotate the lifting scale to enable the blade to move downwards, and slicing; firstly, slicing the crosslinked polyethylene cable on one side to reach the inner layer of the insulating layer;
s3, rotating the cross-linked polyethylene cable by a certain angle, continuing to cut the cable according to the method of the step S2, and obtaining a trapezoid-like shape with two sides cut into straight lines, an upper short arc and a lower long arc from the perspective of the cross section of the cable;
s4, placing the upper edge of the trapezoid in parallel with the blade, fixing the upper edge, adjusting the rotary lifting scale hand wheel to accurately cut the cable, and obtaining the required sample.
2. The improved slicing method based on a crosslinked cable slicer as claimed in claim 1, wherein in step S2, the thickness of each slice should not exceed 2 mm.
3. The method for improving slicing of a crosslinked cable slicer according to claim 1, wherein the step S2 is specifically as follows: adjust the rotatory lift scale hand wheel of slicer earlier, make the blade just contact the surface of the outer semi-conducting layer of cable, drag the cable far to the unable contact position of blade, adjust 5 big check of the rotatory lift scale hand wheel of slicer and make the blade move down 1mm, then the cutting is carried out to the rotatory start button, after having cut the sample once, remember the reading of scale hand wheel this moment, upward move the blade slightly and take out the in-process with the cable and damage the blade, then rotatory lift scale hand wheel 5 big check on the reading basis of writing down, make the blade down 1mm again, repeat this process until cutting the insulating layer inlayer.
4. The method of claim 1, wherein in step S3, the accuracy of the width and thickness of the slice is determined by adjusting the length of the upper side of the trapezoid-like shape, with shorter length and higher accuracy.
5. The improved slicing method based on a cross-linked cable slicer as claimed in claim 4, wherein the length of the upper side length of the trapezoid-like shape is adjusted by controlling the angle of the rotating cable, and the smaller the rotating angle, the shorter the length of the upper side length of the trapezoid-like shape.
6. The method of claim 1 wherein the cable is repeatedly cut according to the desired specimen thickness in step S4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810084036.0A CN108362515B (en) | 2018-01-29 | 2018-01-29 | Slicing improvement method based on crosslinked cable slicer |
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| CN201810084036.0A CN108362515B (en) | 2018-01-29 | 2018-01-29 | Slicing improvement method based on crosslinked cable slicer |
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| CN108362515A CN108362515A (en) | 2018-08-03 |
| CN108362515B true CN108362515B (en) | 2020-01-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112140196B (en) * | 2020-08-11 | 2021-09-21 | 华南理工大学 | Improved slicing method for slicing by using cross-linked cable slicer |
| CN112809754A (en) * | 2020-12-30 | 2021-05-18 | 广东电网有限责任公司电力科学研究院 | Slicing device for cable accessories |
| CN112959398B (en) * | 2021-02-25 | 2022-05-17 | 广东电网有限责任公司电力科学研究院 | Slicing device and slicing method for cable accessory silicon rubber prefabricated part |
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| DE19911163C1 (en) * | 1999-03-12 | 2000-07-20 | Leica Microsystems | Microtome; has control circuit to control drive motor of drive for operating knife or object motion, according to rotation signals of hand wheel, so that cutting is prevented in case of fault |
| CN201611338U (en) * | 2009-11-05 | 2010-10-20 | 广州岭南电缆有限公司 | Device for detecting insulating layer of crosslinked cable |
| CN202471447U (en) * | 2012-02-29 | 2012-10-03 | 广州岭南电缆股份有限公司 | Quick switching device for cable slicing |
| CN103273503A (en) * | 2013-06-09 | 2013-09-04 | 江苏东南电缆有限公司 | Cable slicing device |
| CN105529655A (en) * | 2016-01-29 | 2016-04-27 | 国网山东省电力公司青岛供电公司 | Cable insulating layer cutting knife, clamping device and sampling assembly |
| CN205989354U (en) * | 2016-06-12 | 2017-03-01 | 国家电网公司 | A kind of microsection manufacture device of power distribution network cable cross-linking polyethylene layer |
| CN206678020U (en) * | 2017-03-29 | 2017-11-28 | 河南检亿科技有限公司 | A kind of electric crosslinked cable cuts open, slicer |
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2018
- 2018-01-29 CN CN201810084036.0A patent/CN108362515B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19911163C1 (en) * | 1999-03-12 | 2000-07-20 | Leica Microsystems | Microtome; has control circuit to control drive motor of drive for operating knife or object motion, according to rotation signals of hand wheel, so that cutting is prevented in case of fault |
| CN201611338U (en) * | 2009-11-05 | 2010-10-20 | 广州岭南电缆有限公司 | Device for detecting insulating layer of crosslinked cable |
| CN202471447U (en) * | 2012-02-29 | 2012-10-03 | 广州岭南电缆股份有限公司 | Quick switching device for cable slicing |
| CN103273503A (en) * | 2013-06-09 | 2013-09-04 | 江苏东南电缆有限公司 | Cable slicing device |
| CN105529655A (en) * | 2016-01-29 | 2016-04-27 | 国网山东省电力公司青岛供电公司 | Cable insulating layer cutting knife, clamping device and sampling assembly |
| CN205989354U (en) * | 2016-06-12 | 2017-03-01 | 国家电网公司 | A kind of microsection manufacture device of power distribution network cable cross-linking polyethylene layer |
| CN206678020U (en) * | 2017-03-29 | 2017-11-28 | 河南检亿科技有限公司 | A kind of electric crosslinked cable cuts open, slicer |
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