CN108398359B - Method for judging tire strain degree and evaluating safety - Google Patents
Method for judging tire strain degree and evaluating safety Download PDFInfo
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- CN108398359B CN108398359B CN201810112391.4A CN201810112391A CN108398359B CN 108398359 B CN108398359 B CN 108398359B CN 201810112391 A CN201810112391 A CN 201810112391A CN 108398359 B CN108398359 B CN 108398359B
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- tire
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
Abstract
The invention discloses a method for judging tire strain degree and evaluating safety, which comprises the steps of carrying out titration tests at different positions of a tire to obtain titration rates of different parts of the tire, then comparing the titration rates with a critical rate, judging the strain degree of the tire and carrying out safety evaluation. The method is a nondestructive testing means, a tire does not need to be subjected to a damage experiment in the testing process, the testing is convenient and practical, high-cost instruments and tools are not needed, and the harm caused by invalid tires can be avoided in advance.
Description
Technical Field
The invention relates to a method for judging tire strain degree and evaluating safety, and belongs to the field of tire safety evaluation.
Background
With the development of modern industry and the enlargement of tire production scale, the usage amount of tires is increased day by day. However, the knowledge of when a tire needs to be replaced is fuzzy, most car owners have to replace the tire after the tire is broken, punctured or the like, and the failed tire will possibly cause an accident.
Tires are typically provided with a marked wear limit, i.e., a tread depth of less than 1.6 mm, based on which most people change tires. However, in the case of tire aging, uneven wear due to uneven road surface, and damage to the sidewall due to run-flat running, there is no systematic evaluation method for the tire in these cases.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for judging the strain degree of a tire and evaluating the safety, and provides a simple titration test method for quantitatively analyzing the absorption and diffusion capacity of the tire to a titration solution so as to judge the strain degree of the tire.
In order to solve the technical problems, the invention provides the following technical scheme: a method for judging tire strain degree and evaluating safety comprises the following steps:
step 1) taking a tire with a strain degree at a scrapping critical point and a tire with any strain degree to obtain a standard sample tire and a tire to be tested, and removing impurities attached to the standard sample tire and the tire to be tested;
step 2) selecting a titration point on a standard sample tire, sucking a certain titration solution by using a capillary suction pipe, vertically erecting a capillary above the titration point, enabling the lower part of the capillary to be in contact with the surface of the titration point, starting timing, recording the height of a liquid column of the capillary, and calculating the obtained titration rate of the standard sample tire, namely the critical rate;
step 3) titrating the tire to be tested according to the method in the step 2) to obtain the titration rate of the tire to be tested;
step 4), if the titration rate of the tire to be tested is higher than the critical rate, the tire to be tested is unsafe and needs to be replaced immediately; if the titration rate of the tire to be tested is lower than 80% of the critical rate, the strain degree of the tire to be tested is lower, and the tire can be continuously used; if the titration rate of the tire to be detected is higher than 80% of the critical rate and lower than 95% of the critical rate, the tire to be detected is slightly strained and can be used for a short time but needs to be detected regularly; if the titration rate of the tire to be tested is lower than the critical rate and higher than 95% of the critical rate, the tire to be tested is severely strained, and the tire is considered to be replaced; if the titration rate of the tire to be tested is higher than the critical rate, the tire to be tested is failed, and the tire is replaced immediately; and finishing the detection of whether the tire needs to be scrapped.
The tyre in said step 1) must be kept dry.
The titration solution in the step 2) is water.
Titration rates in said steps 2) and 3):
v＝(H-h)/t (1)
in the formula: v is the titration rate; h is the initial height value of the titration solution in the capillary; h is the height value of the titration solution in the capillary at the end of titration; t is the titration time.
And 2) the titration point is positioned at a position where the surface of the tire pattern is relatively flat.
The method is carried out under the conditions of constant temperature, constant pressure and constant humidity.
The invention has the following beneficial effects:
1. the method utilizes the capillary phenomenon of water, and quantitatively evaluates the strain degree of the tire by calculating the infiltration rate of the water in the capillary to the rubber, and has the advantages of short time, simple and convenient operation, easy material taking and obvious phenomenon; the device has no strict requirements on the terrain and the environment when in use, has low requirements on operators, and has very good operability.
2. The method does not need to damage the sample to be tested, and is a nondestructive testing method.
3. The method is simple to operate, low in cost and free of high-cost instruments and tools.
4. The method has low requirements on environmental conditions, and only needs normal temperature and normal pressure.
5. The method can be used for identifying whether the tire needs to be scrapped or replaced, and has important significance for judging whether the tire is safe in life.
6. The method has a remarkable effect of identifying whether the tire is scrapped or not for the tire with uneven strain or the tire with severe regional strain.
7. The method provides a set of tire strain degree dividing method, and the strain degree of the tire is quantitatively divided according to the infiltration rate.
Detailed Description
The embodiments of the present invention will be further explained below.
Example 1:
a method of determining the degree of wear of a tire, the method comprising the steps of:
step 1) taking a tire with a strain degree at a scrapping critical point and a tire with any strain degree to obtain a standard sample tire and a tire to be tested, and removing impurities attached to the standard sample tire and the tire to be tested;
step 2) selecting a titration point on a standard sample tire, sucking a certain titration solution by using a capillary suction pipe, vertically erecting a capillary above the titration point, enabling the lower part of the capillary to be in contact with the surface of the titration point, starting timing, recording the height of a liquid column of the capillary, and calculating the obtained titration rate of the standard sample tire, namely the critical rate;
wherein the titration rate employs the formula:
v＝(H-h)/t (1)
in the formula: v is the titration rate; h is the initial height value of the titration solution in the capillary; h is the height value of the titration solution in the capillary at the end of titration; t is the titration time.
Step 3) titrating the tire to be tested according to the method in the step 2) to obtain the titration rate of the tire to be tested;
step 4), if the titration rate of the tire to be tested is higher than the critical rate, the tire to be tested is unsafe and needs to be replaced immediately; if the titration rate of the tire to be tested is lower than 80% of the critical rate, the strain degree of the tire to be tested is lower, and the tire can be continuously used; if the titration rate of the tire to be detected is higher than 80% of the critical rate and lower than 95% of the critical rate, the tire to be detected is slightly strained and can be used for a short time but needs to be detected regularly; if the titration rate of the tire to be tested is lower than the critical rate and higher than 95% of the critical rate, the tire to be tested is severely strained, and the tire is considered to be replaced; if the titration rate of the tire to be tested is higher than the critical rate, the tire to be tested is failed, and the tire is replaced immediately; and finishing the detection of whether the tire needs to be scrapped or not.
Example 2:
the titration rates of different parts of the tire were determined by titration of different parts of the tire as described in example 1, and are shown in Table 1. The strain of different parts of the tire is different, and the water absorption rate of the part with the larger strain is higher. Comparing the average titration rates of six different parts in the table 1, wherein the positions of No. 1 are 0.2235cm/s, No. 2 are 0.0815cm/s, No. 3 are 0.1485cm/s, No. 4 are 0.1165cm/s, No. five are 0.28cm/s, and No. 6 is 0.595cm/s, wherein the positions of No. 1, No. 5 and No. 6 are respectively arranged on the tire side wall, and the positions of No. 2, No. 3 and No. 4 are respectively arranged on the tire tread. This indicates that the degree of strain on the side surface of the tire is greater than that on the middle portion, so that the degree of strain on the side surface of the tire can be detected more carefully when detecting the tire. The contact mode of each part of the tire and the ground is different, so the strain degree also has difference.
TABLE 1 titration rates for different parts of the tire
From the above description, those skilled in the art can make various changes and modifications within the scope of the technical idea of the present invention without departing from the scope of the invention. The present invention is not to be taken in a exhaustive sense, but is within the common general knowledge of those skilled in the art.
Claims (6)
1. A method for judging tire strain degree and evaluating safety is characterized by comprising the following steps:
step 1) taking a tire with a strain degree at a scrapping critical point and a tire with any strain degree to obtain a standard sample tire and a tire to be tested, and removing impurities attached to the standard sample tire and the tire to be tested;
step 2) selecting a titration point on a standard sample tire, sucking a certain titration solution by using a capillary suction pipe, vertically erecting the capillary suction pipe above the titration point, enabling the lower part of the capillary suction pipe to be in contact with the surface of the titration point, starting timing, recording the height of a liquid column of the capillary suction pipe, and calculating the titration rate of the standard sample tire, namely the critical rate;
step 3) titrating the tire to be tested according to the method in the step 2) to obtain the titration rate of the tire to be tested;
step 4), if the titration rate of the tire to be tested is higher than the critical rate, the tire to be tested is unsafe and needs to be replaced immediately; if the titration rate of the tire to be tested is lower than 80% of the critical rate, the strain degree of the tire to be tested is lower, and the tire can be continuously used; if the titration rate of the tire to be detected is higher than 80% of the critical rate and lower than 95% of the critical rate, the tire to be detected is slightly strained and can be used for a short time but needs to be detected regularly; if the titration rate of the tire to be tested is lower than the critical rate and higher than 95% of the critical rate, the tire to be tested is severely strained, and the tire is considered to be replaced; and finishing the detection of whether the tire needs to be scrapped.
2. The method for judging the degree of tire strain and evaluating safety according to claim 1, wherein: the tyre in said step 1) must be kept dry.
3. The method for judging the degree of tire strain and evaluating safety according to claim 1, wherein: the titration solution in the step 2) is water.
4. The method for judging the degree of tire strain and evaluating safety according to claim 1, wherein: titration rates in said steps 2) and 3):
v＝（H-h）/t （1）
in the formula: v is the titration rate; h is the initial height value of the titration solution in the capillary pipette; h is the height value of the titration solution in the capillary pipette at the end of titration; t is the titration time.
5. The method for judging the degree of tire strain and evaluating safety according to claim 1, wherein: and 2) the titration point is positioned at a position where the surface of the tire pattern is relatively flat.
6. The method for judging the degree of tire strain and evaluating safety according to claim 1, wherein: the method is carried out under the conditions of constant temperature, constant pressure and constant humidity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810112391.4A CN108398359B (en) | 2018-02-05 | 2018-02-05 | Method for judging tire strain degree and evaluating safety |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810112391.4A CN108398359B (en) | 2018-02-05 | 2018-02-05 | Method for judging tire strain degree and evaluating safety |
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| CN108398359A CN108398359A (en) | 2018-08-14 |
| CN108398359B true CN108398359B (en) | 2020-09-22 |
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Effective date of registration: 20201204 Address after: 402760 No. 92 Donglin Avenue, Biquan Street, Bishan District, Chongqing (No. 52 Factory Building) Patentee after: Chongqing high tech Industry Research Institute Co.,Ltd. Address before: Unit 2414-2416, main building, no.371, Wushan Road, Tianhe District, Guangzhou City, Guangdong Province Patentee before: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Effective date of registration: 20201204 Address after: Unit 2414-2416, main building, no.371, Wushan Road, Tianhe District, Guangzhou City, Guangdong Province Patentee after: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Address before: 443002 No. 8, University Road, Yichang, Hubei Patentee before: CHINA THREE GORGES University |
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Effective date of registration: 20210823 Address after: 402760 No. 555, middle street, Qinggang street, Bishan District, Chongqing Patentee after: Chongqing Yingju Machinery Co.,Ltd. Address before: 402760 No.92 Donglin Avenue, Biquan street, Bishan District, Chongqing Patentee before: Chongqing high tech Industry Research Institute Co.,Ltd. |
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