CN112540027B - Inspection and test method for modified polypropylene plastic cable protection pipe - Google Patents
Inspection and test method for modified polypropylene plastic cable protection pipe Download PDFInfo
- Publication number
- CN112540027B CN112540027B CN202011362644.7A CN202011362644A CN112540027B CN 112540027 B CN112540027 B CN 112540027B CN 202011362644 A CN202011362644 A CN 202011362644A CN 112540027 B CN112540027 B CN 112540027B
- Authority
- CN
- China
- Prior art keywords
- test
- sample
- density
- solution
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for testing a modified polypropylene plastic cable protection pipe, which comprises the following steps: 1) Preparation of pretreatment before inspection; 2) Sampling the reasonable position of the modified polypropylene cable protection pipe; 3) Testing a detection reagent; 4) Testing the Vicat softening performance; 5) And (4) judging a test result: detecting the suspension of the upper limit solution of the reagent sample and the sinking of the lower limit solution of the sample, judging that the test part is qualified, otherwise, judging that the test part is unqualified; the Vicat softening test temperature is higher than 150 ℃, the Vicat softening test temperature is judged to be qualified, and otherwise, the Vicat softening test temperature is not qualified; and judging that the whole section of the inspection pipe is unqualified when an unqualified sample appears. According to the invention, through the field density testing method, the quality density characteristics of the related samples of the cable protection pipe can be accurately detected and evaluated, the use of preposed detection is realized, and the quality safety rate and the product parameter qualification rate of the product are improved.
Description
Technical Field
The invention belongs to the field of power distribution network construction and electric power material inspection, and particularly relates to an inspection and test method for a modified polypropylene plastic cable protection pipe.
Background
Industry background: the modified polypropylene (modified polypropylene plastic) plastic cable conduit, called modified polypropylene plastic power tube for short, is an improved power sheath tube material with excellent heat resistance, which is formed after processing by using modified polypropylene as a main material and adding necessary processing aids, is suitable for laying power cables and plays a role in guiding and protecting.
And (3) checking the background: the product percent of pass is generally lower, and the product hidden danger is serious, especially needs strict supervision, and the quality incident takes place occasionally, and the site acceptance link of cable protection pipe is how to avoid unqualified risk the very first time, reduces the goods and materials quality safety risk of user, and its importance shows gradually.
The inspection technology comprises the following steps: the conventional laboratory test comprises a density and Vicat softening temperature test and a data test and reduction recording process, the related test of the pipe and the laboratory temperature and humidity test environment are analyzed in detail, the key technology processing and the sample preparation also provide related requirements, and due to the limitation of the laboratory test, the time consumption is more in the test process and the sample preparation and transportation links, generally in 7-9 working days, the time is longer, the efficiency is low, and the urgent requirements of power grid construction project units are not met.
The detection process of the cable protection pipe at the present stage is relatively complicated and slow, and the main reasons are as follows:
firstly, measuring the mass of a standard sample by using a high-precision balance by using a mass weighing method to obtain a mass factor;
secondly, measuring the volume by a solution drainage method, and measuring the volume of drained liquid by using precision solution measuring equipment;
thirdly, cooling and shaping the sample, and controlling the test temperature and the sampling temperature to ensure the thermal stability of the sampled particles;
and fourthly, measuring the Vicat softening temperature, putting the sample after sampling and cooling into a test bench, and measuring the temperature characteristic.
The method is particularly remarkable in the process of processing the laboratory temperature and the test samples, which wastes time and labor, and because the samples directly influence the test results, the method is reliable and rapid in sampling and efficient and rapid in test.
Disclosure of Invention
The invention discloses a method for testing a modified polypropylene plastic cable protection pipe, which can be used for rapidly testing whether the physical density and Vicat softening temperature index of the modified polypropylene plastic cable protection pipe are qualified or not in the environments of project construction sites, distribution network power grid construction or storage material acceptance, and the like, so that the rapid inspection and warehouse entry and goods inspection of related materials of a power grid are realized, and the improvement of the overall quality of a product is promoted.
The invention specifically relates to a method for inspecting and testing a modified polypropylene plastic cable protection pipe, which comprises the following steps:
step (1): preparing before inspection, and collecting, processing and inspecting basic information according to different specifications of the test protection pipe and different field test environment temperatures;
step (2): sampling reasonable positions of the modified polypropylene cable protection pipe: selecting different sampling quantities and sampling positions according to different specifications and types of the pipes, and putting the sampled samples into normal temperature or cooling pure water for cooling for 30 minutes;
and (3): testing of testing reagents: selecting a density comprehensive test reagent according to the physical density characteristic of the modified polypropylene cable protection pipe, wherein the resolution of the reagent is 0.90g/cm of the lower limit of the density solution 3 And an upper limit of 0.94g/cm 3 (ii) a The deviation of the test reagent is 0.1g/cm 3 Within, comprehensively processing the deviation of the test reagent and the monitoring error of the density equipment, controlling the error within 3 percent, and normally applying the test reagent, otherwise, replacing the reagent;
and (4): vicat softening performance test: preparing a Vicat test sample with a proper size and specification by sampling drilling equipment, adopting a circular cylinder with the diameter of 10cm and the thickness of the pipe body wall, and cooling the sampled sample and then carrying out a Vicat softening performance test;
and (5): and (4) judging a test result: detecting the suspension of the upper limit solution of the reagent sample and the bottom of the lower limit solution of the sample, judging that the test part is qualified, otherwise, judging that the test part is unqualified; the Vicat softening test temperature is higher than 150 ℃, the Vicat softening test temperature is judged to be qualified, and otherwise, the Vicat softening test temperature is not qualified; and judging that the whole section of the inspection pipe is unqualified when an unqualified sample appears.
Further, the sampling in the step (2) is specifically as follows:
(1) The inner diameter of the modified polypropylene plastic pipe is 100 mm-200 mm, 1 group of samples are randomly drilled at the top, the middle and the bottom of the pipe respectively, and the thickness of the samples does not exceed the thickness of the pipe body;
(2) The modified polypropylene plastic pipe has the rest inner diameters, 1 group of samples are randomly drilled in the middle of the integral pipe, and the thickness of the samples does not exceed the thickness of the pipe body.
Further, the selection of the density comprehensive test solution in the step (3) specifically comprises the following contents:
(1) Preparing a reagent: preparing an upper limit solution, a lower limit solution and a maximum uncertainty solution of a sample;
(2) Reagent matrix: selecting an alcohol solution, and preparing a normal-temperature solution with strong stability;
(3) Under testWhen the reagent is started, selecting the judgment density of 0.90g/cm 3 The lower limit solution of (2) is firstly tested, and when the sample sinks to the bottom, the density is continuously used to be 0.94g/cm 3 And (4) testing the upper limit solution, wherein the test is passed when the sample is suspended, otherwise, replacing the maximum uncertain solution to continue the test, and if the maximum uncertain solution does not pass, judging that the sample is unqualified.
Further, in the density monitoring system in the step (3), the monitoring core value of the densimeter is 0.9g/cm 3 And 0.94g/cm 3 The stable density of the test solution and the error thereof are standard deviation and must not exceed 5 percent.
Further, in the step (2) and the step (4), the cooling time is flexibly selected according to a cooling method, and the water cooling or normal temperature cooling time is more than 30min.
Further, the density testing principle judgment condition of the step (5) is as follows;
test edge lower limit reagent:
case (1): settling the sample, namely, according to the Archimedes principle, G is more than f, namely, rho a is more than rho b, the density of the measured sample is more than the density of the solution, the density of the pipe is more than the standard threshold value of 0.94/cm < 3 >, and the judgment is unqualified;
case (2): suspending the sample, wherein G is less than f according to the Archimedes principle, namely rho a is less than rho b, the density of the measured sample is less than the density of the solution, the density of the pipe is less than the standard threshold value of 0.94G/cm < 3 >, and the qualified product is judged;
case (3): oscillating the sample, namely, replacing the maximum uncertain solution and then testing the boundary solution again according to the uncertainty of the boundary solution in the Archimedes principle;
test edge upper limit reagent:
case (1): settling the sample, namely rho a is greater than rho b when G is greater than f according to the Archimedes principle, determining that the density of the measured sample is greater than the density of the solution, and the density of the pipe is greater than the standard threshold value of 0.9G/cm < 3 >, and determining that the pipe is qualified;
case (2): suspending the sample, wherein G is less than f according to the Archimedes principle, namely rho a is less than rho b, the density of the measured sample is less than the density of the solution, the density of the pipe is less than the standard threshold value of 0.9G/cm < 3 >, and the judgment is unqualified;
case (3): oscillating the sample, namely, replacing the maximum uncertain solution and then testing the boundary solution again according to the uncertainty of the boundary solution in the Archimedes principle;
and (3) after the sample is tested by the upper boundary reagent and the lower boundary reagent, the sample is qualified, and the sample is judged to be qualified, otherwise, the sample is judged to be unqualified.
Further, in the step (4), a temperature test probe and a pressure sensing device are selected, methyl silicone oil is selected as heating liquid, the experiment is continuously carried out by using a probe, the introduction depth of the probe is increased along with the type and temperature of the material, the sampled sample is placed into configured vicat softening temperature test equipment, the closed softening temperature test is carried out, and the temperature result is reflected after 2 hours of test.
Further, the Vicat softening temperature test in the step (4) comprises the following steps:
the method comprises the following steps: starting equipment, monitoring temperature, judging the diameter of the pipe, and stabilizing the equipment heating solution for 10min;
step two: placing the taken sample under a test cover, installing a pressure sensor and a probe, connecting a control system, selecting the type of a test substrate, and starting the test;
step three: according to the temperature heating rising process, recording a temperature rising curve, following the entering depth of the probe, recording the Vicat softening temperature when the sample is pressed into the probe by a pressing needle head with the square millimeter of 1 mm under the conditions of basic load and constant temperature rising, and finishing the inspection.
Compared with the prior art, the invention has the following advantages:
1. subjective and objective quality counterfeiting consciousness can be quickly traced, not only can the consciousness clearly reflect from the raw material proportion, but also can be visually reflected from quality screening of a supply result, and through a quick and effective screening means of a density testing method, basic unqualified factors (material stealing and reduction) can be avoided before use, so that the quality qualified rate of the product is remarkably improved.
2. Along with the appearance of powerful detection method, the link of passive electric power material quality inspection, limitation and safety risk are by greatly reduced, because density test method requires simply, the simple operation is quick, supply of goods and the environmental current situation of bidding, a swift cable protection pipe quality test equipment and the judgement appurtenance based on storage quality inspection, will show the improvement, quality safety and material qualification degree in the link of quality inspection receipts goods, reduce the user's risk, effectively discriminate material quality situation, use the intensive detection means at the end of quality inspection, effectively promote material quality qualification rate.
3. The invention can effectively purify the supply environment of the material market, not only can prolong the service life of the product, avoid the risk of unqualified quality, but also can guide the market trend of the material supply, enhance the quality investment of enterprises, reduce the bidding risk, help the enterprises to improve the product capability, save the material use and supply cost, has particularly remarkable economic and social benefits, can be expected to remarkably improve the qualification rate of the product quality of the cable protection tube, and effectively improve the circulation and storage efficiency of the cable protection tube, thereby realizing the win-win of multi-party benefit subjects.
Drawings
FIG. 1 is a general flow chart of an inspection test method for modified polypropylene plastic cable protection tubing in accordance with the present invention;
FIG. 2 is a flow chart of the inspection steps of the inspection test method of the present invention;
FIG. 3 is a laboratory test procedure of the present invention;
FIG. 4 is a graph comparing the test results of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The invention discloses a method for inspecting and testing a modified polypropylene plastic cable protection pipe, which comprises the following steps:
1) The test method relates to the national standard, and the threshold value is selected as follows:
the most common and direct method of failure is to add an excess of auxiliary materials (CaCO) to the product 3 Etc.) to increase the profit margin of the product, excess CaCO 3 The physical and chemical properties of the pipe can be seriously influenced by adding the auxiliary materials, and the mechanical property is obviousThe reduction, the electric insulation performance weakens, and phenomena such as easy emergence fracture in transportation, storage and the use. Density of product following CaCO 3 The content increases.
The laboratory test content of the cable protection pipe comprises two aspects of physical performance test and electric heating analysis, wherein density and Vicat softening temperature indexes in a test project are classified into class A of the highest grade according to importance degree, and the index is the most core index for judging whether the product performance of the protection pipe reaches the standard or not and is a negative index for evaluating whether the protection pipe can normally work under the power grid operation environment or not. The density index of the material is used as a core A-class index, has a direct relation with the proportion of the raw materials, and can be used as an intuitive representation index for judging whether the proportion of the material is qualified or not.
According to DL/T802.7-2010 conduit technical condition for power cables section 7: the physical density is an A-level important index, and the range of the standard threshold density rho is 0.90-0.94 g/cm 3 。
According to DL/T802.7-2010 conduit technical condition for power cables section 7: modified polypropylene plastic cable conduit for trenchless use is shown in the specification, and the Vicat softening temperature is an important index of A level and is required to be more than 150 ℃.
According to the patent development needs, the following reagents are specially selected according to the actual conditions on the site:
the solution density is 0.90g/cm at normal temperature 3 And 0.94g/cm 3 The threshold value of the solution can increase the edge early warning function, and the yellow early warning of the modified polypropylene plastic is 0.89g/cm 3 The maximum uncertainty of the solution of (2) is 0.95g/cm in red 3 The compounding agent and the compounded solution should not react with the modified polypropylene material and the quicklime and other auxiliary materials.
The density of the M1 reagent is 0.94g/cm < 3 >, the solvent is stable, the test is accurate, and the applicable temperature environment is wide;
the M2 solvent is a solution with the density of 0.89g/cm < 3 >, the solvent is stable, the test is accurate, and the applicable temperature environment is wide;
the solution with the M3 solvent density of 0.95g/cm < 3 >, the solvent is stable, the test is accurate, and the applicable temperature environment is wide;
the M4 solvent is a solution with the density of 0.90g/cm < 3 >, the solvent is stable, the test is accurate, and the applicable temperature environment is wide;
2) The test object is:
the modified polypropylene plastic cable protection pipe is widely sold in domestic markets and purchased and constructed by power grid enterprises in various specifications and models.
3) The detection method comprises the following steps:
test preparation:
temperature and humidity records of a sampling test site, equipment adjustment and assembly, a sampling gun with a replaceable drill bit is recommended to be selected, and the test cabin has a sealed temperature and density monitoring function.
Preparing for sampling:
the drill bit of the sampling equipment is adjusted, and the sampling drill bit is selected according to different specifications and models of the pipe, generally speaking, the specification of the common power grid protection pipe is 100/150/200.
The sampling method comprises the following steps:
the inner diameter of the modified polypropylene plastic pipe is 100 mm-200 mm, 1 group of samples are randomly drilled at the top, the middle and the bottom of the pipe respectively, and the thickness of the samples does not exceed the thickness of the pipe body;
randomly drilling 1 group of samples in the middle of the integral pipe with the rest inner diameters of the modified polypropylene plastic pipe, wherein the thickness of the samples does not exceed the thickness of the pipe body;
the test flow comprises the following steps: sampling a pipe, cooling a sample, preparing a test solution, preparing a temperature test, judging the test, and performing solution post-treatment, wherein the steps are shown in figure 1.
The sampling part is positioned in the middle of the pipe, the sample is smooth and free of impurity adhesion, the test solution is free of crystal precipitation, the test temperature requirement is met, the test bottle is held by hands before the test and is shaken up lightly, the test chamber is a clean beaker or a particle bottle or a specially-made sealed test result analysis chamber and other special equipment, and the test chamber is not polluted before the test.
The checking step is shown in fig. 2:
the method comprises the following steps: preparing before inspection, collecting, processing and inspecting basic information according to different specifications of the test protection coffin and different field test environmental temperatures;
step two: providing a sampling method based on the reasonable position of a modified polypropylene cable protection pipe; selecting different sampling quantities and sampling directions according to different specifications and types of the pipes, and putting the sampled samples into normal temperature or cooling pure water for cooling for 30 minutes;
step three: testing the testing reagent, selecting a density comprehensive testing reagent according to the physical density characteristics of the modified polypropylene protection tube, and using the reagent with the resolution of 0.90g/cm of the lower limit of the density solution 3 And an upper limit of 0.94g/cm 3 (ii) a Deviation of test reagent. + -. 0.1g/cm 3 Monitoring and comprehensively processing the deviation of the test reagent and the monitoring error of density equipment, wherein the error is controlled within 3 percent, the test reagent can be normally applied, otherwise, the reagent is replaced;
step four: performing Vicat softening performance test, reasonably preparing Vicat test samples with proper size and specification by sampling drilling equipment, and recommending a circular cylinder with the diameter of 10cm and the thickness of the pipe body wall thickness;
the fifth step: and (3) detecting the suspension of the upper limit solution of the reagent sample and the bottom sinking of the lower limit solution of the sample, judging that the tested part is qualified, otherwise, judging that the tested part is unqualified, wherein the Vicat softening test temperature is higher than 150 ℃, judging that the tested part is qualified, otherwise, judging that the tested part is unqualified, and judging that the unqualified sample and the whole section of the test pipe are unqualified.
4) And (3) judging a test result:
density test inspection and determination principle:
test edge lower limit reagent:
case (1): the sample is sunk, G is more than f according to the Archimedes principle, namely rho a is more than rho b, the density of the measured sample is more than the density of the solution, and the density of the pipe is more than the standard threshold value and is 0.94/cm 3 Judging that the product is unqualified;
case (2): suspending the sample, wherein G is more than f according to the Archimedes principle, namely rho a is more than rho b, the density of the measured sample is less than that of the solution, and the density of the pipe is less than the standard threshold value of 0.94G/cm 3 Judging to be qualified;
case (3): oscillating the sample, namely, replacing the maximum uncertain solution and then testing the boundary solution again according to the uncertainty of the boundary solution in the Archimedes principle;
test edge upper limit reagent:
case (1): the sample is sunk, G is more than f according to the Archimedes principle, namely rho a is more than rho b, the density of the measured sample is more than the density of the solution, and the density of the pipe is more than the standard threshold value and is 0.9G/cm 3 Judging to be qualified;
case (2): suspending the sample, wherein G is more than f according to the Archimedes principle, namely rho a is more than rho b, the density of the measured sample is less than that of the solution, and the density of the pipe is less than the standard threshold value of 0.9G/cm 3 Judging that the product is unqualified;
case (3): oscillating the sample, namely, replacing the maximum uncertain solution and then testing the boundary solution again according to the uncertainty of the boundary solution in the Archimedes principle;
and (4) after the sample is tested by the lower limit solution and the upper limit solution, the sample is qualified at the same time, and the sample is judged to be qualified, otherwise, the sample is judged to be unqualified.
The principle of Vicat temperature test, inspection and judgment is as follows:
and the Vicat softening temperature test of the sample is more than or equal to 150 ℃, the test result is qualified, and otherwise, the test result is unqualified.
And if and only if the modified polypropylene plastic cable protection pipe is qualified after the physical density reagent test and the Vicat temperature test of the sampled modified polypropylene plastic cable protection pipe, judging that the obtained cable protection pipe section is qualified.
5) The judgment principle is as follows:
DL/T802.7-2010 conduit for power cables technical condition section 7: the qualified range of the density is 0.9-0.94 g/cm according to the requirements of the modified polypropylene plastic cable conduit for non-excavation 3 The Vicat softening temperature is not less than 150 ℃ when qualified;
archimedes' principle, i.e. a body in a stationary fluid is subjected to a buoyancy force, whose magnitude is equal to the weight of the fluid displaced by the body, and which is directed vertically upwards and through the centroid of the displaced fluid. And when the density value of the test sample is greater than the density of the solution, the test sample sinks, and when the density value of the test sample is less than the density of the solution, the sample floats.
In order to further demonstrate that the method provided by the invention can effectively discriminate unqualified modified polypropylene plastic pipes, and the inspection result is consistent with the laboratory test, the results are obtained and analyzed by setting the experimental example and the comparison example and comparing the field test result with the laboratory test result, and the method comprises the following steps:
1. field examples and laboratory control settings
On-site example 1
The power grid company material warehouse lot No. 1903J0321101 modified polypropylene plastic cable protection tube has the diameter of 100mm and the production date of 2019-12-09, samples meet the basic requirements of testing, and TD solution samples sink through sampling field testing and are judged to be unqualified.
Field example 2
The power grid company material warehouse lot number 1903J0321502 modified polypropylene plastic cable protection tube has the diameter of 200mm and the production date of 2019-10-12, a sample meets the basic test requirements, and the TD sample sinks to the bottom through the sampling field test to judge that the test is unqualified.
Field example 3
The power grid company material warehouse lot number 1901J0650401 modified polypropylene plastic cable protection tube is 100mm in diameter, the production date is 2019-12-03, a sample meets the basic test requirements, and a TD sample is settled through a sampling field test and is judged to be unqualified.
Field example 4
The power grid company material warehouse batch number 2003J0002102 modified polypropylene plastic cable protection tube has the diameter of 200mm, the production date of 2020-4-16, and the sample meets the basic test requirements, and is qualified through sampling field test, TP sample suspension, TS sample bottoming and judgment.
Field example 5
The power grid company material warehouse lot number 1901J0568901 modified polypropylene plastic cable protection tube has the diameter of 100mm and the production date of 2019-11-14, samples meet the basic requirements of testing, and pass the judgment of sampling field testing, TP sample suspension, TS sample sinking.
Laboratory control example 1
The power grid company material warehouse lot No. 1903J0321101 modified polypropylene plastic cable protection tube has the diameter of 100mm and the production date of 2019-12-09, a sample meets the basic requirements of the test, and after the density index is tested, the method goes into detailPerforming Vicat softening temperature test, wherein the Vicat softening temperature is 146 ℃, and the test density result is 0.96g/cm 3 And (5) judging that the test is unqualified, and judging that the field test result is consistent with the comprehensive test result of the laboratory.
Laboratory control example 2
The power grid company material warehouse lot No. 1903J0321502 modified polypropylene plastic cable protection tube has the diameter of 200mm and the production date of 2019-10-12, samples meet the basic test requirements, and after the density index is tested, the Vicat softening temperature test is carried out in detail, wherein the Vicat softening temperature is 144 ℃, and the density test is 0.97g/cm 3 And (5) judging that the test is unqualified, and judging that the field test result is consistent with the comprehensive test result of the laboratory.
Laboratory control example 3
The power grid company material warehouse lot No. 1901J0650401 modified polypropylene plastic cable protection tube has the diameter of 100mm and the production date of 2019-12-03, samples meet the basic test requirements, and after the density index is tested, the Vicat softening temperature test is carried out in detail, wherein the Vicat softening temperature is 141 ℃, and the density test is 0.98g/cm 3 And (5) judging that the test is unqualified, and judging that the field test result is consistent with the comprehensive test result of the laboratory.
Laboratory control example 4
The power grid company material warehouse batch No. 2003J0002102 modified polypropylene plastic cable protection tube has the diameter of 200mm and the production date of 2020-4-16, a sample meets the basic test requirement, and after the density index is tested, the Vicat softening temperature test is carried out in detail, the Vicat softening temperature is 151 ℃, and the density test is 0.92g/cm 3 And (4) judging to be qualified, and judging to be consistent with a laboratory comprehensive test result through testing on site.
Laboratory control example 5
The power grid company material warehouse lot No. 1901J0568901 modified polypropylene plastic cable protection tube has the diameter of 100mm and the production date of 2019-11-14, samples meet the basic test requirements, and after the density index is tested, the Vicat softening temperature test is carried out in detail, the Vicat softening temperature is 150 ℃, and the density test is 0.91g/cm 3 And (4) judging to be qualified, and judging to be consistent with a laboratory comprehensive test result through testing on site.
The test results are shown in FIG. 4.
Quick test result table
| Numbering | Material quality | Diameter of | Determination | Vicat test | Density test |
| 1903J0321101 | Modified polypropylene | 100 | Fail to be qualified | Temperature failed | Density fail |
| 1903J0321502 | Modified polypropylene | 200 | Fail to be qualified | Temperature failing to pass | Density failed |
| 1901J0650401 | Modified polypropylene | 100 | Fail to be qualified | At a temperature ofBy passing | Density failed |
| 2003J0002102 | Modified polypropylene | 200 | Qualified | Temperature passing | Density through |
| 1901J0568901 | Modified polypropylene | 100 | Qualified | Temperature passing | Density through |
Comparison test result table
| Numbering | Material of | Diameter of | Determination | Vicat softening (. Degree. C.) | Density (g/cm 3) |
| 1903J0321101 | Modified polypropylene | 100 | Fail to be qualified | 146 | 0.96 |
| 1903J0321502 | Modified polypropylene | 200 | Fail to be qualified | 144 | 0.97 |
| 1901J0650401 | Modified polypropylene | 100 | Fail to be qualified | 141 | 0.98 |
| 2003J0002102 | Modified polypropylene | 200 | Qualified | 151 | 0.92 |
| 1901J0568901 | Modified polypropylene | 100 | Qualified | 150 | 0.91 |
2. Description of the test procedure
The test method adopted in the field experiment example and the laboratory control example comprises the following specific steps:
1) And (3) field test flow: sampling a pipe, cooling a sample, preparing a test reagent, preparing a Vicat test, and judging the test;
2) The sampling part meets the requirements of a sampling test method, the sample is smooth in whole and free of impurity adhesion, the test solution is free of crystal precipitation and meets the requirements of test temperature, the test bottle is held by hands before the test and is shaken up lightly, the test chamber is a clean beaker or a particle bottle or a specially-made sealed test result analysis chamber and other special equipment, and the test chamber is not polluted before the test.
3) And (3) performing laboratory contrast test, accurately measuring the weight of the sample by using a high-precision balance by adopting a physical method, preparing the sample into a standard cube by using linear cutting, and then sequentially testing the temperature characteristic by using Meitess high-precision testing Vicat softening temperature testing equipment.
The laboratory test equipment mainly comprises a balance, a cutting machine, a Vicat softening temperature tester and a beaker.
The laboratory test procedure is shown in figure 3.
3. Experimental reference standard, relevant parameter and result description
According to DL/T802.7-2010 conduit technical condition for power cables section 7: the non-excavation modified polypropylene plastic cable conduit requires that the density standard threshold density range of 0.90-0.94 g/cm < 3 > is qualified, and the Vicat softening temperature is more than or equal to 150 ℃. The samples in this test were all random products with production dates ranging from 2019 to 2020.
4. Conclusion of the experiment
The experiment tries to analyze the results of the field test method and the high-precision laboratory equipment by setting the comparison example
Through experimental results, the fact that the accuracy of a field test solution is extremely high and the result of the field test solution is extremely consistent with that of a laboratory test method can be accurately found, and 5 groups of comparative experimental examples cover the range of diameter pipes commonly used by the power department.
In conclusion, by adopting the rapid testing formula solution, the rapid testing method and the rapid testing application of the cable protection pipe based on the modified polypropylene plastic material, provided by the invention, unqualified modified polypropylene plastic cable protection pipes can be effectively screened. The overall quality level of the modified polypropylene plastic cable protection pipe is effectively improved in the process of warehousing and goods inspection of the electric power construction meter; compared with the traditional laboratory entrusted inspection, the method has the advantages of shortening the inspection period, being simple to operate, being low in cost and the like, and can be widely applied to projects of electric power construction and storage inspection.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention, such as modification by other sampling methods and test solution solvents, replacement of test density solution or archimedes determination method, lightweight modified polypropylene device, replacement of methyl silicone oil, water cooling fast set, etc. to meet the requirements of determination of standard density and vicat softening temperature of modified polypropylene plastic cable protection tube test, should be included in the scope of the present invention in the application of modified polypropylene plastic cable protection tube density test.
Claims (4)
1. A test method for testing modified polypropylene plastic cable protection pipes is characterized by comprising the following steps:
step (1): preparing before inspection, and collecting, processing and inspecting basic information according to different specifications of the protective pipe to be tested and different temperatures of field test environments;
step (2): sampling reasonable positions of the modified polypropylene cable protection pipe: selecting different sampling quantities and sampling positions according to different specifications and types of the pipes, and placing the sampled samples into normal temperature or cooling pure water for cooling for 30 minutes; the whole sample is smooth and has no impurity adhesion;
and (3): testing of testing reagents: selecting a density comprehensive test reagent according to the physical density characteristic of the modified polypropylene cable protection pipe, wherein the resolution of the reagent is 0.90g/cm of the lower limit of the density solution 3 And an upper limit of 0.94g/cm 3 (ii) a TestingDeviation of reagent at 0.1g/cm 3 Within, comprehensively processing the deviation of the test reagent and the monitoring error of the density monitoring system, controlling the error within 3 percent, and enabling the test reagent to be normally applicable, otherwise, replacing the reagent; no crystal is precipitated from the test solution, the test temperature requirement is met, the test cabin is held by hands before the test and is shaken up lightly, the test cabin is a clean beaker, a particle bottle or a specially-made sealed test result analysis cabin, and the test solution is not polluted before the test;
and (4): vicat softening performance test: preparing a Vicat test sample with a proper size and specification by sampling drilling equipment, adopting a circular cylinder with the diameter of 10cm and the thickness of the pipe body wall, and cooling the sampled sample and then carrying out a Vicat softening performance test;
and (5): and (4) judging a test result: detecting the suspension of the upper limit solution of the reagent sample and the bottom of the lower limit solution of the sample, judging that the test part is qualified, otherwise, judging that the test part is unqualified; the Vicat softening test temperature is higher than 150 ℃, the Vicat softening test temperature is judged to be qualified, and otherwise, the Vicat softening test temperature is not qualified; judging that the whole section of the inspection pipe is unqualified when an unqualified sample appears;
the sampling in the step (2) is specifically as follows:
(1) The inner diameter of the modified polypropylene plastic pipe is 100 mm-200 mm, 1 group of samples are randomly drilled at the top, the middle and the bottom of the pipe respectively, and the thickness of the samples does not exceed the thickness of the pipe body;
(2) The modified polypropylene plastic pipe has the rest inner diameter, 1 group of samples are randomly drilled in the middle of the integral pipe, and the thickness of the samples does not exceed the thickness of the pipe body;
the selection of the density comprehensive test solution in the step (3) specifically comprises the following contents:
(1) Preparing a reagent: the method comprises the steps of sample upper limit solution preparation, sample lower limit solution preparation and sample maximum uncertainty solution preparation;
(2) Reagent matrix: selecting an alcohol solution, and preparing a normal-temperature solution with strong stability;
(3) At the beginning of the test reagent, the judgment density is selected to be 0.90g/cm 3 The lower limit solution of (2) is firstly tested, and when the sample sinks to the bottom, the density is continuously used to be 0.94g/cm 3 The upper limit solution is tested, the sample passes the test when suspended, otherwiseReplacing the maximum uncertain solution to continue testing, and if the solution does not pass the test, judging that the solution is unqualified;
in the step (4), the Vicat softening performance is tested, a temperature test probe and a pressure sensor are selected, methyl silicone oil is selected as heating liquid, a probe is used for carrying out continuous experiment, the introduction depth of the probe is increased along with the type and temperature of the material, a sample after sampling is loaded into configured Vicat softening temperature test equipment, a closed softening temperature test is carried out, and a temperature result is reflected after 2 hours of test;
the Vicat softening temperature test in the step (4) comprises the following test steps:
the method comprises the following steps: starting equipment, monitoring temperature, judging the diameter of the pipe, and stabilizing the equipment heating solution for 10min;
step two: placing the taken sample under a test cover, installing a pressure sensor and a probe, connecting a control system, selecting the type of a test substrate, and starting the test;
step three: according to the temperature heating rising process, recording a temperature rising curve, following the entering depth of the probe, recording the Vicat softening temperature when the sample is pressed into the probe by a pressing needle head with the square millimeter of 1 mm under the conditions of basic load and constant temperature rising, and finishing the inspection.
2. The method for inspecting and testing the modified polypropylene plastic cable protection tubing in accordance with claim 1, wherein the density monitoring system and densitometer in step (3) have a monitoring core value of 0.9g/cm 3 And 0.94g/cm 3 The stable density of the test solution and the error thereof are standard deviation and must not exceed 5 percent.
3. The method for inspecting and testing the modified polypropylene plastic cable protection pipe material as claimed in claim 1, wherein in the step (2) and the step (4), the cooling time is flexibly selected according to the cooling method, and the water cooling or normal temperature cooling time is more than 30min.
4. The method for inspecting and testing the modified polypropylene plastic cable protective tubing as claimed in claim 1, wherein the density test principle of the step (5) is as follows;
test edge lower limit reagent:
case (1): the sample is sunk, G is more than f according to the Archimedes principle, namely rho a is more than rho b, the density of the measured sample is more than the density of the solution, the density of the pipe is more than the standard threshold value of 0.94/cm < 3 >, and the sample is judged to be unqualified;
case (2): suspending the sample, wherein G is less than f according to the Archimedes principle, namely rho a is less than rho b, the density of the measured sample is less than the density of the solution, the density of the pipe is less than the standard threshold value of 0.94G/cm < 3 >, and the qualified product is judged;
case (3): oscillating the sample, namely, replacing the maximum uncertain solution and then testing the boundary solution again according to the uncertainty of the boundary solution in the Archimedes principle;
test edge upper limit reagent:
case (1): settling the sample, namely rho a is greater than rho b when G is greater than f according to the Archimedes principle, determining that the density of the measured sample is greater than the density of the solution, and the density of the pipe is greater than the standard threshold value of 0.9G/cm < 3 >, and determining that the pipe is qualified;
case (2): suspending the sample, wherein G is less than f according to the Archimedes principle, namely rho a is less than rho b, the density of the measured sample is less than the density of the solution, the density of the pipe is less than the standard threshold value of 0.9G/cm < 3 >, and the judgment is unqualified;
case (3): oscillating the sample, namely, replacing the maximum uncertain solution and then testing the boundary solution again according to the uncertainty of the boundary solution in the Archimedes principle;
and (3) after the sample is tested by the upper boundary reagent and the lower boundary reagent, the sample is qualified, and the sample is judged to be qualified, otherwise, the sample is judged to be unqualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011362644.7A CN112540027B (en) | 2020-11-28 | 2020-11-28 | Inspection and test method for modified polypropylene plastic cable protection pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011362644.7A CN112540027B (en) | 2020-11-28 | 2020-11-28 | Inspection and test method for modified polypropylene plastic cable protection pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112540027A CN112540027A (en) | 2021-03-23 |
| CN112540027B true CN112540027B (en) | 2022-11-08 |
Family
ID=75015538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011362644.7A Active CN112540027B (en) | 2020-11-28 | 2020-11-28 | Inspection and test method for modified polypropylene plastic cable protection pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112540027B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155703B (en) * | 2021-04-28 | 2022-05-31 | 特拓(青岛)轮胎技术有限公司 | Method for testing porosity of rubber |
| CN113639804B (en) * | 2021-10-19 | 2022-02-08 | 中国电力科学研究院有限公司 | Method and system for detecting quality of cable conduit |
| CN114216816A (en) * | 2021-11-19 | 2022-03-22 | 国网江苏省电力有限公司盐城供电分公司 | On-site density rapid identification tester for CPVC (chlorinated polyvinyl chloride) and MPP (modified Polypropylene) cable protection tubes |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6668647B1 (en) * | 1999-06-25 | 2003-12-30 | Instrotek, Inc. | Methods and apparatus for sealing and analyzing material samples including uncompacted bituminous samples according to water displacement testing methods |
| CN1161598C (en) * | 2002-04-04 | 2004-08-11 | 中华人民共和国上海出入境检验检疫局 | Device and method for measuring density of polyethene or polypropene resin and at ordinary temp |
| DE10311611A1 (en) * | 2003-03-14 | 2004-09-23 | Degussa Ag | Crystallisation unit suspension solid content determination procedure compares density with suspension free fluid and reference value |
| CN209485910U (en) * | 2018-12-13 | 2019-10-11 | 中国石油化工股份有限公司 | A kind of volume density test device of one-component fiber |
| CN210005383U (en) * | 2019-04-23 | 2020-01-31 | 天津美亚化工有限公司 | modified polypropylene mineral filling quantity measurement auxiliary device |
| CN110455680A (en) * | 2019-09-02 | 2019-11-15 | 蚌埠中光电科技有限公司 | A kind of test device of glass density |
-
2020
- 2020-11-28 CN CN202011362644.7A patent/CN112540027B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 影响塑料密度测量准确性因素的探讨;梁秀丽 等;《工程塑料应用》;20140331;第42卷(第3期);第86-89页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112540027A (en) | 2021-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112540027B (en) | Inspection and test method for modified polypropylene plastic cable protection pipe | |
| CN103063528B (en) | Method for fast evaluating high temperate member residual service life on spot | |
| CN108072567B (en) | Plastic constant-temperature stress corrosion experimental device and method | |
| CN113626970B (en) | Method and system for evaluating corrosion residual life of public pipe gallery pipeline | |
| CN111474109B (en) | Test method for predicting service life of thermoplastic plastic in oil-gas environment | |
| CN108717098B (en) | Method for improving detection precision of concentration of mixed gas | |
| CN112393942B (en) | Cable protection pipe on-site rapid testing method based on distribution network CPVC materials | |
| CN109164138A (en) | A kind of in-service line for polyethylene gas pipes method for predicting residual useful life | |
| CN103278525B (en) | Safety assessment method for pressure-bearing equipment after fire disaster | |
| Wu et al. | Distribution of the mechanical strength of solid catalysts | |
| CN112393941B (en) | Density test method for MPP (modified Polypropylene) or CPVC (chlorinated polyvinyl chloride) cable protection pipe | |
| CN204330470U (en) | A kind of structural silicone sealant for building incision strength testing device | |
| KR102367829B1 (en) | Method and device for discrimination between natural gas and swamp gas | |
| CN207540860U (en) | A kind of protective device of gas analyzer constant pressure and flow | |
| CN109459320B (en) | Method for testing maximum service temperature of thermoplastic plastic | |
| Ge et al. | Research on oil-well tubing damage monitoring of intelligent well based on FSM technology | |
| CN112560237A (en) | Method and system for rapidly testing service life of gas rubber pipe | |
| CN114088611B (en) | Sulfur-containing gas well sulfur-containing gas corrosion evaluation device and evaluation method | |
| CN114184488B (en) | Quick testing method for service life of optical cable of oil well | |
| Ye et al. | Effect of calcium content on the performance of CPVC cable protective tube | |
| CN117990785A (en) | Evaluation method for ageing performance of pipeline | |
| CN114689489A (en) | Method for evaluating thermal aging state of main casting pipeline based on single test temperature | |
| CN114881262A (en) | Large-scale boiler high temperature pressure-bearing pipeline life cycle management system | |
| Tems et al. | Field and laboratory measurements with hydrogen permeation measurement devices | |
| CN117969334A (en) | Method for measuring moisture content in montan wax by distillation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230423 Address after: No. 189, Jiefang Road, Yancheng City, Jiangsu Province Patentee after: YANCHENG POWER SUPPLY BRANCH, STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. Patentee after: JIANGSU ANFANG ELECTRIC POWER TECHNOLOGY Co.,Ltd. Address before: No. 189, Jiefang Road, Yancheng City, Jiangsu Province Patentee before: YANCHENG POWER SUPPLY BRANCH, STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. |
|
| TR01 | Transfer of patent right |