Some standard content:
National Standard of the People's Republic of China
Wire rope core
Steel wire ropes-Sisal main coresThis standard adopts ISO 4345-1988 "Wire rope-Fiber main core-Specification". 1 Subject content and scope of application
GB/T 15030--94
This standard specifies the product marking, technical requirements, test methods, inspection rules, packaging and marking of sisal steel wire rope core. This standard applies to steel wire rope cores made of sisal fiber. 2 Reference standards
GB/T15029 Sisal white palm rope
GB6530 Sampling and temperature adjustment for rope testing
3 Product marking
The product marking of sisal steel wire rope core is expressed by nominal diameter and linear density. Marking example:
Sisal steel wire rope core
4 Technical requirements
4.1 Structure
5-17.5-2.50
Yarn density, ktex
Linear density, ktex
Diameter, mm
The sisal steel wire rope core shall be twisted from no less than three uniform strands. Both the strands and the core shall be good and strong, without obvious defects. Each bundle of cores shall be continuous and uninterrupted. 4.2 Characteristic requirements
4.2.1 The allowable deviation and range of diameter of each grade of core shall comply with Table 1. Table 1
Allowable deviation of diameter, %
Range of diameter, %
4.2.2 Allowable deviation of core linear density ±5%. Superior products
First-class products
Qualified products
4.2.3 The lubricant added to facilitate the manufacture of the rope core should not contain acid and water. The lubricant content is generally not more than 10%, or agreed upon by the supply and demand parties, approved by the State Technical Supervision Bureau on April 12, 1994 and implemented on October 1, 1994.
GB/T 15030-94
4.2.4 The water-soluble acidity of the rope core is not more than 2mL0.1mol/L acid per 100g of rope core. 4.2.5 The salt content of the rope core (expressed as a percentage of sodium chloride) should not exceed 0.3%. 4.2.6 The public moisture regain of the rope core is 13%. 5 Test method
5.1 Sampling
5.1.1 Take 3 small samples from each sample bundle 2m away from any end: a. 4m long, for diameter test and then for linear density test, b. 70-80g, of which about 50g for regain test and the rest for lubricant (extractable) content test. This sample should be quickly put into a plastic bag and sealed after extraction;
c. 20-30g for water solubility test.
5.1.2 The rope core manufacturer takes samples from the sisal fiber packages supplied for rope core manufacturing for salt content test. Each sampling shall not be less than 3 packages, and a small sample of about 50g is taken from each package.
5.1.3 When sampling, the production or factory date, product grade, production unit and sampler of the sample bundle should be recorded, and the sample should be marked. At the same time, the air temperature and relative humidity of the sampling environment should be recorded. 5.2 Diameter test
5.2.1 Principle
Place the specimen under the specified pre-tension and measure its diameter. 5.2.2 Test conditions
5.2.2.1 The test may be carried out under normal ambient conditions. 5.2.2.2 The arbitration test shall be carried out under standard atmospheric conditions for conditioning and testing of textiles: temperature 20±2°C, relative humidity 65%±2%. 5.2.3 Test apparatus
Strength testing machine: It can apply the specified tension to the test. The length of the specimen under the specified tension shall exceed 3m. Caliper: Accuracy 0.1mm.
5.2.4 Test procedure
5.2.4.1 For the arbitration test, the specimen shall be conditioned under the conditions specified in 5.2.2 for at least 24h. 5.2.4.2 Place the specimen under the pre-tension calculated according to formula (1). F=
Where: F——pretension, N;
nominal diameter of a rope core, mm.
5.2.4.3 Use a caliper to measure the rope core under the above tension, and measure at three points at both ends and the middle of the 3m long sample. When measuring, the caliper and the rope centerline are perpendicular to each other, and the measurement is accurate to 0.1mm. Record each measurement value. 5.2.5 Calculation and expression
The diameter of the sample is expressed as the arithmetic mean of the six measured values. The maximum difference between any two of the six measurements represents the range. 5.3 Linear density test
5.3.1 Principle
Put the sample under the specified pretension, measure a certain length of the sample, weigh it, and calculate the linear density of the sample. 5.3.2 Test conditions
According to the provisions of Article 5.2.2 of this standard.
5.3.3 Test instrument
Strength testing machine according to the requirements of 4.3.
Steel ruler: scale 1mm,
balance, sensitivity 0.1g,
rope cutter.
5.3.4 Test procedure
GB/T 15030—94
5.3.4.1 Place the sample under the tension calculated by formula (1), and then make two marks on the sample, which are at least 3m apart. Measure the distance. The measurement is accurate to 1 mm.
5.3.4.2 Remove the sample from the strength testing machine, cut the sample at the two marks, and weigh the weight of this section of the sample, accurate to 0.1g. 5.3.5 Calculation and expression
5.3.5.1 The linear density of the sample is calculated according to formula (2), accurate to one decimal place. Wwww.bzxz.net
W—Linear density, ktex,
W—Sample weight, g,
L—Length of the sample under specified tension, m. 5.4 Acidity test of water-soluble acid
5.4.1 Principle
Boil the sample with distilled water and wash it repeatedly to fully dissolve the water-soluble acid in the sample in the extract, and then titrate it with 0.1 mol/L sodium hydroxide or potassium hydroxide standard solution until it turns permanently red. Determine the acidity of the water-soluble acid in the sample based on the volume of the consumed standard solution. 5.4.2 Test conditions
Test under ambient atmospheric conditions.
5.4.3 Test instruments and reagents
Soxhlet extractor: 250mL,
Balance: sensitivity 0.1g;
Burette: scale 0.1mL;
Dropping agent: distilled water,
Reagents: phenol crisp, 0.1mol/L sodium hydroxide or potassium hydroxide standard solution. 5.4 Test procedure
5.4.4.1 Weigh the sample to an accuracy of 0.1g, record it, disassemble the sample and put it into the Soxhlet extractor. 5.4.4.2 Boil it with 100mL of distilled water for 30min, filter it with filter paper, and then wash the filter residue with hot distilled water for 3 consecutive times. After washing, the total amount of the extract shall not exceed 175mL.
5.4.4.3 Add a few drops of phenolic acid to the extract, and then titrate with 0.1 mol/L sodium hydroxide or potassium hydroxide standard solution until it turns permanently red. 5.4.5 Calculation and Expression
5.4.5.1 The acidity of the water-soluble acid of the sample is calculated according to formula (3). z=10×V
Wherein: 2-
acidity of water-soluble acid, mL/g,
-amount of 0.1 mol/L sodium hydroxide or potassium hydroxide standard solution consumed, mL, W—-weight of the sample, g.
Calculation is accurate to 0.1 mL/100 g.
5.5 Salt content test
5.5.1 Principle
After the sample is subjected to a series of chemical treatments, the percentage of sodium chloride in the sample is calculated from the amount of silver nitrate converted into silver chloride, based on the fact that 1 mL of 0.1 mol/L silver nitrate droplet is equivalent to 0.00585 g of sodium chloride. 175
5.5.2 Test conditions
Test in ambient atmospheric conditions.
5.5.3 Test instruments and reagents
Soxhlet extractor: 250 mL;
Balance: sensitivity. 0.1 g,
Platinum or quartz,
Solvent: distilled water, 20% (V/V) nitric acid; GB/T 15030—94
Reagents: a. a. 50g/L sodium carbonate solution; b. 0.1 mol/L silver nitrate standard titration solution; saturated ammonium ferric sulfate solution;
d. 0.1 mol/L potassium thiocyanate standard titration solution. 5.5.4 Sample preparation
Split the selected samples and lay them flat so that the fibers are parallel to each other and placed alternately head to tail. Then cut a 230mm section from the middle and roll and mix them into a bundle with parallel fibers. Then randomly select a fiber sample from any part of this bundle and cut it into two sections of about 115mm in length. The sample obtained in this way should be stored in a wide-mouth bottle with a glass stopper and taken out only when tested. 5.5.5 Test procedure
5.5.5.1 After testing according to 5.5.Take out about 10g of fiber from the 4 prepared samples, weigh it to the nearest 0.1g, record it, and place it in platinum III or quartz III. Wet the fiber with 40mL of 50g/L sodium carbonate solution, evaporate it to dryness, and then burn it at a temperature not exceeding dark red (or the temperature is high enough to produce a fully carbonized product, and a colorless filtrate can be obtained when extracted with water). 5.5.5.2 Extract the carbonized product with hot distilled water, filter and wash it. Put the residue back into the platinum dish or quartz III and let it completely burn into ash.
5.5.5.3 Dissolve the ash in 20% (V/V) nitric acid, filter and wash the residue, and then add this solution and washing liquid to the extract. 5.5.5.4 Acidify the combined extracts with dilute nitric acid, and then add a known volume of 0.1mol/L silver nitrate standard titration solution, slightly excessive, stir it thoroughly, filter out the precipitated silver chloride and wash it. 5.5.5.5 Add 5 mL of saturated ammonium sulfate solution to the combined filtrate and washing solution, and then titrate the excess silver nitrate with 0.1 mol/L potassium thiocyanate standard titration solution until it turns permanently light brown. 5.5.6 Calculation and Expression
5.5.6.1 The percentage of salt (NaCI) content in the sample is calculated according to formula (4). Y-V)X 0. 005 85 × 100
Wherein: Y-salt (NaCI) content percentage, %, V,---0. 1 mol/L silver nitrate standard titration solution consumption, mL; V2--0.1 mol/L potassium thiocyanate standard titration solution consumption, mL; W sample weight, g.
5.5.6.2 The percentage of salt content of the entire batch of rope cores is expressed as the arithmetic mean of the percentage of salt content of all samples, and the calculation is accurate to two decimal places.
5.6 Moisture regain and lubricant content test
According to the provisions of Appendix A and Appendix B of GB/T15029. 6 Inspection rules
6.1 Factory inspection
6.1.1 The diameter, linear density, moisture regain, lubricant content, acidity of water-soluble acid and other items shall be inspected when the rope core leaves the factory. 6.1.2 Factory inspection shall be carried out by sampling bundles according to the provisions of Chapter 3 of GB6530. 176
GB/T 15030-94
6.1.3 When sisal fiber enters the factory, the salt content item shall be inspected, and the inspection batch shall not exceed 60 packages. 6.2 Weight acceptance
Generally, the weight indicated on the rope core sheath shall be accepted. If there is any objection, the acceptance shall be carried out according to the provisions of the rope metric calculation method in Appendix C of GB/T15029. 6.3 Re-inspection
6.3.1 During the inspection, if the diameter deviation, extreme difference and line density do not meet the standard requirements, it is allowed to re-draw double the amount of samples for re-inspection of the project, and the re-inspection shall prevail.
6.3.2 If there is any objection during delivery, the supplier and the buyer can jointly re-inspect once and make a judgment based on the re-inspection results. The re-inspection fee shall be borne by the responsible party. 6.4 Inspection report
An inspection report should be written after various inspections are completed, including: a.
Batch number, grade, etc. of the inspected product, date of production or entry into the factory; number and name of the implementation standard;
Inspection results of each item;
Determination of grade, etc. of the inspected product;
Sampling date, atmospheric temperature and relative humidity during sampling, test conditions, inspection unit (plus inspector and date). 7 Packaging and marking
7.1 The rope core should be continuously wound into bundles, and the length of each bundle can be negotiated and determined by the supplier and the buyer. Each bundle of rope cores shall be firmly tied with 4 to 6 packing ropes, and both ends of the rope cores shall be firmly tied to prevent loosening. 7.2 Each bundle of rope cores shall be wrapped with plastic woven cloth. 7.3 Each bundle of rope cores shall be attached with a label and product certificate. The label shall indicate the product name, trademark, grade, nominal diameter, wire density, bundle weight, length, manufacturer name, manufacturer address and manufacturing date. The foreskin shall be printed with product mark, trademark, grade, bundle weight and moisture-proof mark. Additional remarks:
This standard was proposed by the Ministry of Agriculture of the People's Republic of China. This standard was drafted by the Guangdong Province Yuexi Agricultural Reclamation Bureau. The main drafters of this standard are Zhu Tianli, Zheng Wanchun, Lin Hanhe and Gao Jianguo. 177
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