CN117705561A - Test tool and method for compression set in rubber service state - Google Patents
Test tool and method for compression set in rubber service state Download PDFInfo
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- CN117705561A CN117705561A CN202211096430.9A CN202211096430A CN117705561A CN 117705561 A CN117705561 A CN 117705561A CN 202211096430 A CN202211096430 A CN 202211096430A CN 117705561 A CN117705561 A CN 117705561A
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- 230000006835 compression Effects 0.000 title claims abstract description 47
- 238000007906 compression Methods 0.000 title claims abstract description 47
- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title abstract description 5
- 239000004744 fabric Substances 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000012784 inorganic fiber Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000004636 vulcanized rubber Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the technical field of rubber detection, and particularly discloses a test fixture and a method for compression set in a rubber service state, a sample bin and a fabric loop; the sample bin comprises a sample bin upper bin and a sample bin lower bin; the upper bin and the lower bin of the sample bin can be connected into a whole through threads, and the fabric ring is arranged in the upper bin of the sample bin and clings to the inner wall of the upper bin of the sample bin; two or three upper bin medium holes are formed in the side face of the upper bin of the sample bin; two or three lower bin medium holes are arranged on the side face of the lower bin of the sample bin. According to the invention, the sample is placed in the sample bin, the upper bin and the lower bin of the sample bin are screwed, so that the accuracy of the compression size of the rubber sample and the accuracy of the test result are ensured; and provides the medium environment condition for simulating the actual service of the rubber sample to obtain the test result which is more in line with the actual use condition; the fabric ring is arranged, so that the sample is ensured not to expand into a medium hole while the contact between the medium and the sample is not affected, and the influence of the opening on the inner wall of the sample bin on the sample is reduced.
Description
Technical Field
The invention belongs to the technical field of rubber detection, and particularly relates to a test tool and a test method for compression set in a rubber service state.
Background
Rubber is widely applied to the sealing field due to excellent high elasticity, and sealing products play a role in preventing medium leakage through flexible sealing generated by compression of rubber materials. The rubber is generally subjected to certain physical and chemical changes in a compressed state, and when the compression force is removed, the generated changes prevent the rubber from returning to the original state, so that compression set is generated. Compression set is one of the most intuitive important parameters for measuring the sealability of rubber materials.
The rubber compression set test aims at a vulcanized rubber standard sample piece, usually a cylindrical rubber bean, the sample is placed in a compression device during the test, the height of the sample is measured after the sample is compressed for a certain time, the compression is released after the sample is compressed for a certain time, the height of the sample is measured again after the sample is recovered for a specified time in a free state, and the permanent compression set of the vulcanized rubber sample is calculated through the change of the height, so that the performance of the vulcanized rubber is evaluated.
In the current practical evaluation test, on one hand, the problem of inaccurate measurement of the mounting height of the sample exists, three samples are usually put in the middle of two disc-shaped pressing plates at the same time in the test, and are fastened to the target height through bolts in the center of the pressing plates, but in the practical test process, the compression heights of different samples are different due to the fact that the placing positions of a plurality of samples are different and the size deviation exists in the compression tool, so that the test result is influenced. On the other hand, more and more test results show that besides compressive load stress, the medium environment in which the rubber material is in service has a great influence on the performance of the test specimen. The permanent deformation of rubber is mainly caused by physical reasons under the compression state of normal temperature and normal pressure. However, rubber seals are often subjected to various environmental conditions during use, including high temperatures, oils, water, gases, etc., under which there are chemical changes, including swelling, crosslinking of rubber molecules, and breakage of rubber molecular chains, among other physical reasons. Therefore, in order to provide more accurate data support for practical applications of rubber, the influence of the medium environment on the test must be considered.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a test fixture and a test method for compression set in a rubber service state, so as to solve the problem that the prior art cannot accurately measure the compression set of rubber in different medium environments.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention provides a test fixture for compression set in a rubber service state, which comprises:
a sample bin and a fabric loop; the sample bin comprises a sample bin upper bin and a sample bin lower bin; the upper bin and the lower bin of the sample bin can be connected into a whole through threads, and the fabric ring is arranged in the upper bin of the sample bin and clings to the inner wall of the upper bin of the sample bin; two or three upper bin medium holes are formed in the side face of the upper bin of the sample bin; two or three lower bin medium holes are arranged on the side surface of the lower bin of the sample bin.
Further, the upper bin of the sample bin is formed by fixing a cylinder and an annular cylinder, and the medium hole of the upper bin is arranged on the side surface of the annular cylinder.
Further, the lower bin of the sample bin is a cylinder, and a groove matched with the annular cylinder is formed in the upper portion of the cylinder.
Further, the annular cylinder outer wall of the upper bin of the sample bin is provided with an upper bin external thread, the groove side wall of the lower bin of the sample bin is provided with a lower bin internal thread, when the upper bin of the sample bin is screwed with the lower bin of the sample bin, the upper bin external thread is matched with the lower bin internal thread, and the number of teeth of the upper bin external thread is 1-3 more than that of the lower bin internal thread.
Further, the number of the upper bin medium holes is the same as that of the lower bin medium holes; when the upper bin of the sample bin is screwed with the lower bin of the sample bin, the medium holes of the upper bin are communicated with the medium holes of the corresponding lower bin.
Further, the fabric loop is made of inorganic fibers or organic fibers.
Further, the outer diameter of the fabric ring is the same as the inner diameter of the upper bin of the sample bin.
Further, the height of the sample chamber is 75% of the height of the standard sample, and the inner diameter of the sample chamber is=1.1 times to 1.3 times of the diameter of the standard sample and the thickness of the fabric loop.
Further, the cross section of the sample bin is processed into a round shape or a hexagonal shape.
The test method for compression set in the rubber service state comprises the following steps of:
step 1: measuring the height h of the compression set standard sample 0 ；
Step 2: placing a standard sample at a determined height h s The upper surface and the lower surface of the standard sample are ensured to be horizontal in the compression permanent deformation sample chamber, and the fabric ring is arranged in the sample chamber and clings to the inner wall of the sample chamber;
step 3: screwing the sample bin to the tightest;
step 4: placing a sample bin of a standard sample into a medium, adding test fluid, and heating and pressurizing;
step 5: heating and pressurizing for 1d-7d, cooling and decompressing, taking out the sample bin from the medium, cooling to room temperature, opening the sample bin, recovering for 1h at room temperature, and measuring the height h of the sample after the test 1 ；
Step 6, calculating compression set C of the standard sample:
wherein each height unit is mm.
The invention has at least the following beneficial effects:
1. according to the invention, the sample is placed in the sample bin, the upper bin and the lower bin of the sample bin are screwed, so that the accuracy of the compression size of the rubber sample and the accuracy of the test result are ensured; the test result which is more in line with the actual use working condition is obtained by simulating the actual service medium environmental condition of the rubber sample; the fabric ring is arranged, so that the sample is ensured not to expand into a medium hole while the contact between the medium and the sample is not affected, and the influence of the opening on the inner wall of the sample bin on the sample is reduced.
2. The invention performs circumferential constraint on the sample in the simulated medium condition, and prevents the influence of volume expansion of the sample due to gas swelling in a gas phase environment on the test result.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is an explosion schematic diagram of a test fixture for compression set in a rubber service state;
FIG. 2 is a schematic side view structure of a test fixture for compression set in a rubber service state.
Reference numerals: 1. loading a sample bin; 2. an external thread of the upper bin; 3. a medium hole of the upper bin; 4. a fabric loop; 5. a vulcanized rubber sample; 6. the sample bin is arranged below the bin; 7. lower bin internal threads; 8. and a lower bin dielectric hole.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
Example 1
1-2, a test fixture for compression set in a rubber service state comprises:
a sample compartment and a fabric loop 4; the sample bin comprises a sample bin upper bin 1 and a sample bin lower bin 6; the upper sample bin 1 and the lower sample bin 6 can be connected into a whole through threads, and the fabric ring 4 is arranged in the upper sample bin 1 and clings to the inner wall of the upper sample bin 1.
The upper bin 1 of the sample bin is formed by fixing a cylinder and an annular cylinder, and two or three upper bin medium holes 3 are formed in the side surface of the annular cylinder; the lower sample bin 6 is a cylinder, a groove matched with the annular cylinder is formed in the upper part of the cylinder, and two or three lower bin medium holes 8 are formed in the side face of the lower sample bin 6; the annular cylinder outer wall of the upper bin 1 of the sample bin is provided with an upper bin external thread 2, the groove side wall of the lower bin 6 of the sample bin is provided with a lower bin internal thread 7, when the upper bin 1 of the sample bin is screwed with the lower bin 6 of the sample bin, the upper bin external thread 2 is in threaded fit with the lower bin internal thread 7, the number of teeth of the upper bin external thread 2 is 1-3 more than that of the lower bin internal thread 7, and the fact that the upper bin 1 of the sample bin can be screwed to the tightest to ensure the compression height is ensured.
The number of the upper bin dielectric holes 3 is the same as that of the lower bin dielectric holes 8; when the upper bin 1 of the sample bin is screwed with the lower bin 6 of the sample bin, the upper bin dielectric hole 3 is completely communicated with the lower bin dielectric hole 8.
The medium in liquid phase and gas phase can contact with the rubber sample through the upper bin medium hole 3 and the lower bin medium hole 8.
The fabric ring 4 is made of inorganic fibers or organic fibers, does not react with the medium in the test process, and has the outer diameter identical to the inner diameter of the upper bin 1 of the sample bin.
The fabric ring 4 does not obstruct the medium from entering the sample bin through the upper bin medium hole 3 and the lower bin medium hole 8 on one hand, and on the other hand, the fabric ring 4 can prevent the sample from expanding into the upper bin medium hole 3 and the lower bin medium hole 8 to damage the surface of the sample.
The height of the sample chamber is 75% of the height of the standard sample, and the inner diameter of the sample chamber is=1.1 times to 1.3 times of the diameter of the standard sample and the thickness of the fabric loop 4.
The cross section of the sample bin can be processed into a round shape or a hexagonal shape and the like according to different fastening modes.
Example 2
Taking the current vulcanized rubber sample compression set test standard type B sample as an example, the diameter of the vulcanized rubber-containing standard sample is 13.0mm, the height is 6.3mm, the height of the sample bin is 4.725mm, and the inner diameter of the sample bin is 16.4mm. The fabric ring 4 is glass fiber plain cloth with the thickness of 0.4mm and is arranged on the inner wall of the sample bin.
A test method for compression set in a rubber service state comprises the following steps:
step 1: measuring the height h of the compression set vulcanized rubber-containing standard sample 0 The measurement accuracy is 0.01mm, and the same vulcanized rubber can be used for simultaneously testing a plurality of samples;
step 2: placing a standard sample containing vulcanized rubber into a certain height h s The upper surface and the lower surface of a standard sample containing vulcanized rubber are ensured to be horizontal in a compression permanent deformation sample chamber, and a fabric ring 4 is arranged in the sample chamber and clings to the inner wall of the sample chamber;
step 3: screwing the sample bin upper bin 1 to the tightest;
step 4: placing a sample bin containing a vulcanized rubber standard sample into a medium, such as a high-temperature high-pressure kettle, adding test fluid, heating and pressurizing until reaching a target state;
step 5: heating and pressurizing for 1d-7d, cooling and decompressing, taking out the sample bin from the medium, cooling to room temperature, opening the sample bin, recovering for 1h at room temperature, and measuring the height h of the sample after the test 1 ；
And 6, calculating compression set C of the standard sample containing vulcanized rubber according to the following formula:
wherein each height unit is mm.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The utility model provides a compression set's test fixture under rubber service condition which characterized in that includes:
a sample bin and a fabric loop (4); the sample bin comprises a sample bin upper bin (1) and a sample bin lower bin (6); the upper sample bin (1) and the lower sample bin (6) can be connected into a whole through threads, and the fabric ring (4) is arranged in the upper sample bin (1) and clings to the inner wall of the upper sample bin (1); two or three upper bin medium holes (3) are arranged on the side surface of the upper bin (1) of the sample bin; two or three lower bin medium holes (8) are arranged on the side surface of the lower bin (6) of the sample bin.
2. The test fixture for compression set under the rubber service state according to claim 1, wherein the upper bin (1) of the sample bin is formed by fixing a cylinder and an annular cylinder, and the upper bin dielectric hole (3) is arranged on the side surface of the annular cylinder.
3. The test fixture for compression set in a rubber service state according to claim 2, wherein the lower bin (6) of the sample bin is a cylinder, and a groove matched with the annular cylinder is formed in the upper portion of the cylinder.
4. The test fixture for compression set under the rubber service state according to claim 2, wherein an upper bin external thread (2) is arranged on the outer wall of the annular cylinder of the upper bin (1) of the sample bin, a lower bin internal thread (7) is arranged on the side wall of the groove of the lower bin (6) of the sample bin, when the upper bin (1) of the sample bin is screwed with the lower bin (6) of the sample bin, the upper bin external thread (2) and the lower bin internal thread (7) are in threaded fit, and the number of teeth of the upper bin external thread (2) is 1-3 teeth greater than that of the lower bin internal thread (7).
5. The test fixture for compression set in a rubber service state according to claim 1, wherein the number of the upper bin medium holes (3) is the same as the number of the lower bin medium holes (8); when the upper bin (1) of the sample bin is screwed with the lower bin (6) of the sample bin, the upper bin dielectric holes (3) are communicated with the corresponding lower bin dielectric holes (8).
6. The test fixture for compression set in a rubber service state according to claim 1, wherein the fabric loop (4) is made of inorganic fibers or organic fibers.
7. The test fixture for compression set in a rubber service state according to claim 1, wherein the outer diameter of the fabric ring (4) is the same as the inner diameter of the upper bin (1) of the sample bin.
8. The test fixture for compression set under the service state of rubber according to claim 1, wherein the height of the sample chamber is 75% of the height of a standard sample, and the inner diameter of the sample chamber is=1.1-1.3 times of the diameter of the standard sample and the thickness of a fabric loop (4).
9. A test fixture for compression set in a rubber service state according to claim 3, wherein the cross section of the sample chamber is processed into a round shape or a hexagonal shape.
10. A test method for compression set in a rubber service state, characterized in that the test tool for compression set in a rubber service state according to any one of claims 1 to 9 comprises the following steps:
step 1: measuring the height h of the compression set standard sample 0 ；
Step 2: placing a standard sample at a determined height h s The upper surface and the lower surface of the standard sample are ensured to be horizontal in the compression permanent deformation sample bin, and the fabric ring (4) is arranged in the sample bin and clings to the inner wall of the sample bin;
step 3: screwing the upper bin (1) of the sample bin to the tightest;
step 4: placing a sample bin of a standard sample into a medium, adding test fluid, and heating and pressurizing;
step 5: heating and pressurizing for 1d-7d, cooling and decompressing, taking out the sample bin from the medium, cooling to room temperature, opening the sample bin, recovering for 1h at room temperature, and measuring the height h of the sample after the test 1 ；
Step 6, calculating compression set C of the standard sample:
wherein each height unit is mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211096430.9A CN117705561A (en) | 2022-09-08 | 2022-09-08 | Test tool and method for compression set in rubber service state |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211096430.9A CN117705561A (en) | 2022-09-08 | 2022-09-08 | Test tool and method for compression set in rubber service state |
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| Publication Number | Publication Date |
|---|---|
| CN117705561A true CN117705561A (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211096430.9A Pending CN117705561A (en) | 2022-09-08 | 2022-09-08 | Test tool and method for compression set in rubber service state |
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| Country | Link |
|---|---|
| CN (1) | CN117705561A (en) |
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- 2022-09-08 CN CN202211096430.9A patent/CN117705561A/en active Pending
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