CN114235554A - Fluoroplastic pipe tensile strength testing device - Google Patents
Fluoroplastic pipe tensile strength testing device Download PDFInfo
- Publication number
- CN114235554A CN114235554A CN202111522805.9A CN202111522805A CN114235554A CN 114235554 A CN114235554 A CN 114235554A CN 202111522805 A CN202111522805 A CN 202111522805A CN 114235554 A CN114235554 A CN 114235554A
- Authority
- CN
- China
- Prior art keywords
- pipe
- tensile strength
- fluoroplastics
- fluoroplastic
- centre gripping
- 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.)
- Pending
Links
- 229920002313 fluoropolymer Polymers 0.000 title claims abstract description 63
- 238000012360 testing method Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims abstract description 4
- 239000002390 adhesive tape Substances 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 11
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 11
- 239000004810 polytetrafluoroethylene Substances 0.000 description 11
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 7
- 238000010998 test method Methods 0.000 description 6
- XIUFWXXRTPHHDQ-UHFFFAOYSA-N prop-1-ene;1,1,2,2-tetrafluoroethene Chemical group CC=C.FC(F)=C(F)F XIUFWXXRTPHHDQ-UHFFFAOYSA-N 0.000 description 4
- 239000004812 Fluorinated ethylene propylene Substances 0.000 description 3
- 229920009441 perflouroethylene propylene Polymers 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003889 chemical engineering Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- 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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application belongs to the experimental field of tubular product, in particular to fluoroplastics tubular product tensile strength testing arrangement. The device includes chuck nut (1), collet chuck (2), connecting rod (3), collet chuck (2) have the centre gripping hole, and collet nut (1) threaded connection is in collet chuck (2) tip promotes through rotating collet nut (1) fluoroplastics pipe to the downthehole removal of centre gripping, centre gripping downthehole wall have the toper inclined plane, are used for fluoroplastics pipe removes the in-process compression centre gripping to the centre gripping downthehole wall fluoroplastics pipe, connecting rod (3) connect experimental tensile machine through adapter (5), fluoroplastics pipe both ends interpolation has the plug, the outside winding in fluoroplastics pipe both ends has the sticky tape. The application provides a testing arrangement is difficult for appearing tubular product slippage and tubular product fracture phenomenon at the testing process, has improved the tubulose form tensile strength effective value measurement probability of fluoroplastics tubular product, has improved the reliability of test data.
Description
Technical Field
The application belongs to the experimental field of tubular product, in particular to fluoroplastics tubular product tensile strength testing arrangement.
Background
The fluoroplastic polytetrafluoroethylene and the polyfluorinated ethylene propylene can be manufactured into polytetrafluoroethylene tubes and perfluorinated ethylene propylene tubes by adopting an extrusion molding process, and the fluoroplastic polytetrafluoroethylene and the perfluorinated ethylene propylene tubes are widely applied to the fields of electronics, electric heating, aerospace, aviation, chemical engineering, communication and the like. The tensile strength of the polytetrafluoroethylene tube and the perfluoroethylene propylene tube is an important index for ensuring the product quality, and particularly, the tensile strength of the tube must be tested to ensure the use safety of the product when the tube is applied to high-strength occasions.
At present, tensile strength test methods for polytetrafluoroethylene tubes and perfluoroethylene propylene tubes at home and abroad mainly comprise a tubular tensile strength test method and a dumbbell-type test sample tensile strength test method. For the pipe with smaller inner diameter, the dumbbell-shaped sample can not be prepared, and the tensile strength test in a tubular form is mostly adopted. The specifications of the tubular tensile strength of polytetrafluoroethylene tubes and perfluoroethylene propylene tubes in domestic and foreign standards are shown in Table 1.
Table 1 tensile strength test specimen specification
The surface free energy of the fluoroplastic is lower, and the surfaces of the pipes are smooth. The tubular tensile strength test equipment usually adopts an electronic test tensile machine, and the conventional tensile strength clamp suitable for tubular materials mainly comprises a wedge-shaped tensile clamp and a wafer clamp. The following problems occur when testing the tensile strength of tetrafluoroethylene pipes and fluorinated ethylene propylene pipes according to the existing testing method and the testing clamp: the clamping head is excessively tightly held, the clamping head is easy to damage a pipe sample, the sample is broken from the clamping head of the pipe sample, and effective tensile strength data cannot be measured (according to standard requirements, if a tensile strength test breaking point is at the clamping head, invalid data is obtained); the clamping head is not tightly clamped, the pipe sample is smooth, the sample often slips from the clamping head, and effective tensile strength data cannot be measured. Therefore, the probability of measuring the effective values of the tubular tensile strength of the fluoroplastic polytetrafluoroethylene tube and the perfluoroethylene propylene tube by the conventional test method and test fixture is low.
Disclosure of Invention
In order to solve the technical problem, this application provides a fluoroplastics tubular product tensile strength testing arrangement, mainly includes chuck nut, collet chuck, connecting rod, collet chuck has the grip hole, and collet nut threaded connection is in the collet chuck tip promotes through rotating the chuck nut fluoroplastics pipe to the downthehole removal of grip hole, grip hole inner wall have the toper inclined plane, are used for fluoroplastics pipe removes the in-process compression centre gripping to the grip hole inner wall fluoroplastics pipe, the connecting rod passes through the adapter and connects experimental pulling force machine, fluoroplastics pipe both ends interpolation has the plug, the outside winding in fluoroplastics pipe both ends has the sticky tape.
Preferably, a first mark is provided at a first distance from a tip of each end of the fluoroplastic pipe, a second mark is provided at a second distance from the tip of the fluoroplastic pipe, the second distance is greater than the first distance, the mandrel is inserted from the tip of the fluoroplastic pipe and extends into the second mark, and a portion of the fluoroplastic pipe extending into the clamping hole of the collet chuck does not exceed the first mark.
Preferably, the adhesive tape is wound from the ends of both ends of the fluoroplastic pipe to the second mark.
Preferably, the first distance is 25mm and the second distance is 27 mm.
Preferably, the core rod is made of stainless steel 0Cr18Ni 9.
Preferably, the adhesive tape is soft and has a rough surface, and the adhesive tape is wound around the two ends of the fluoroplastic pipe for two turns.
Preferably, the connecting rod is connected with the adapter through a screw.
Preferably, the adapter passes through the bolt and is connected with experimental pulling force machine, still cup jointed the nut on the adapter, the nut is located the lower extreme of adapter and experimental pulling force machine junction for prevent that the adapter from rocking for experimental pulling force machine.
The application provides a testing arrangement is difficult for appearing fluoroplastics tubular product slippage and tubular product and holding the cracked phenomenon in the position with adding at anchor clamps at the test procedure, and the tubulose form tensile strength effective value probability of measuring fluoroplastics tubular product is high, and the test data reliability is high.
Drawings
Fig. 1 is a schematic structural diagram of a locking device of a fluoroplastic pipe tensile strength testing device of the present application.
Fig. 2 is a schematic structural diagram of the adapter device according to the embodiment shown in fig. 1 of the present application.
Fig. 3 is a schematic structural view of the nut of the embodiment shown in fig. 1 of the present application.
The clamp comprises a clamp nut 1, a spring clamp 2, a connecting rod 3, a first screw hole 4, an adapter 5, a bolt 6, a nut 7 and a second screw hole 8.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
The utility model aims to provide a fluoroplastics tubular product tensile strength testing arrangement improves the probability of polytetrafluoroethylene and perfluor ethylene propylene tubular product tubulose form tensile strength virtual value based on the device, improves test data's reliability. The device solves the problem that the sample is damaged and broken at the chuck in the tensile strength testing process of the fluoroplastic pipe, and solves the problem that the sample slips in the tensile strength testing process of the fluoroplastic pipe.
The application provides a fluoroplastics tubular product tensile strength testing arrangement, as shown in fig. 1-fig. 3, mainly include chuck nut 1, collet 2, connecting rod 3, collet 2 has the grip hole, and 1 threaded connection of chuck nut is in 2 tip of collet, through rotating 1 promotion of chuck nut fluoroplastics pipe to the removal in the grip hole, grip hole inner wall have the toper inclined plane, are used for fluoroplastics pipe removes the in-process compression centre gripping to the grip hole inner wall fluoroplastics pipe, connecting rod 3 connects experimental pulling force machine through adapter 5, fluoroplastics pipe both ends interpolation has the plug, the outside winding in fluoroplastics pipe both ends has the sticky tape.
According to the method, firstly, the core shafts are respectively plugged into two ends of the sleeve, the two ends of the sleeve are externally wound by the aid of the adhesive tapes, then the prepared sample is installed inside a spring chuck of the locking device, and the chuck nut 1 is screwed on the spring chuck 2 to form the locking device, as shown in fig. 1. The locking device is then connected to the adapter device as shown in fig. 2. And fixing the installed clamps at two ends of the electronic test tensile machine, opening a control program of the electronic test tensile machine, setting test programs such as tensile speed and the like, starting the test programs, and testing the tensile strength of the sample. The test procedure for the samples was carried out by selecting the drawing speed and the clamp distance according to the current standards for plastic sleeves (QB/T4877-2015, QB/T4883-2015, UL224, IEC 60684).
In some alternative embodiments, each end of the fluoroplastic pipe has a first mark at a first distance from the end, and a second mark at a second distance from the end, the second distance being greater than the first distance, the mandrel is inserted from the end of the fluoroplastic pipe and extends into the second mark, and the portion of the fluoroplastic pipe extending into the clamping hole of the collet 2 does not exceed the first mark.
In some alternative embodiments, the tape is wound from the ends of the two ends of the fluoroplastic pipe to the second mark.
In some alternative embodiments, the first distance is 25mm and the second distance is 27 mm.
In some alternative embodiments, the mandrel is made of stainless steel 0Cr18Ni9, and has a surface roughness and an arithmetical mean deviation of the profile Ra of 0.40 μm. The core rod is 30mm long and has the same diameter as the inner diameter of the pipe. The core rod is used for supporting the sleeve and avoiding damage caused by excessive deformation of the clamping part. In addition, the core rod is made of a stainless steel rod with small surface roughness, so that the core rod is prevented from being corroded due to long-term exposure in air, and the core rod is easy to insert into the pipe.
In some alternative embodiments, the adhesive tape is a soft adhesive tape with a rough surface, and the adhesive tape is wound around the two ends of the fluoroplastic pipe for two turns. The adhesive tape can be 2214 adhesive tape of 3M company, is used for protecting the pipe from being damaged by the metal chuck, has high surface roughness and can reduce the risk of the sleeve slipping from the clamping part due to smooth outer wall.
In some alternative embodiments, the connecting rod 3 and the adapter 5 are connected by screws. As shown in fig. 1, the end of the connecting rod 3 has a first screw hole 4, and the end of the adapter 5 has a second screw hole 8, so that the connecting rod 3 and the adapter 5 are connected by screws.
In some optional embodiments, the adapter 5 is connected with the test tensile machine through a bolt 6, a nut 7 is further sleeved on the adapter 5, and the nut 7 is located at the lower end of the joint of the adapter 5 and the test tensile machine and used for preventing the adapter 5 from shaking relative to the test tensile machine.
The use of the fluoroplastic pipe tensile strength testing apparatus of the present application is illustrated by the following two examples.
The first embodiment,
(1) Sample preparation: a polytetrafluoroethylene sleeve pipe with the wall thickness of 0.2mm and the inner diameter of phi 4 of 100mm is taken and marked at the positions 25mm and 27mm away from two ends respectively. And respectively plugging mandrels from two ends of the sleeve, wherein the plugging position of the mandrels is at the 27mm mark. The two ends of the sleeve are wound with 3M 2214 adhesive tape for 2 circles at the 27mm mark.
(2) Installing a clamp: and (3) installing the sample prepared in the previous step in a spring chuck of a locking device, wherein the bottom end of the spring chuck is flush with the 25mm mark of the sample. And screwing the nut on the spring chuck to form a locking device, and connecting the locking device with the electronic test tensile machine sensor adapter through a screw.
(3) And fixing the mounted clamps at two ends of an electronic test tensile machine, and testing the polytetrafluoroethylene sleeve according to a UL224 tensile strength testing method, wherein the clamping distance is 50mm, and the tensile speed is 508 mm/min.
(4) And (3) test results: the polytetrafluoroethylene sleeve with the wall thickness of 0.2mm and the inner diameter of phi 4 is not broken at the clamping part, the breaking position is 20mm below the clamp at the upper end of the sleeve, the data is effective data, and the tensile strength is 39 Mpa.
Example II,
(1) Sample preparation: 100mm of fluorinated ethylene propylene pipe with the wall thickness of 0.5mm and the inner diameter of phi 6 is taken and marked at the positions 25mm and 27mm away from two ends respectively. And respectively plugging mandrels from two ends of the sleeve, wherein the plugging position of the mandrels is at the 27mm mark. The two ends of the sleeve are wound with 3M 2214 adhesive tape for 2 circles at the 27mm mark.
(2) Installing a clamp: and (3) installing the sample prepared in the previous step in a spring chuck of a locking device, wherein the bottom end of the spring chuck is flush with the 25mm mark of the sample. And screwing the nut on the spring chuck to form a locking device, and connecting the locking device with the electronic test tensile machine sensor adapter through a screw.
(3) And fixing the mounted clamps at two ends of an electronic test tensile machine, and testing the fluorinated ethylene propylene pipe according to a UL224 tensile strength testing method, wherein the clamping distance is 50mm, and the tensile speed is 508 mm/min.
(4) And (3) test results: the perfluorinated ethylene propylene copolymer tube with the wall thickness of 0.5mm and the inner diameter of phi 6 is not broken at the clamping part, the breaking position is 25mm below the upper end clamp, the data is effective data, and the tensile strength is 37 MPa.
The application provides a testing arrangement is difficult for appearing tubular product slippage and tubular product fracture phenomenon at the testing process, has improved the tubulose form tensile strength effective value measurement probability of fluoroplastics tubular product, has improved the reliability of test data.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a fluoroplastics tubular product tensile strength testing arrangement, a serial communication port, including chuck nut (1), collet chuck (2), connecting rod (3), collet chuck (2) have the centre gripping hole, and collet nut (1) threaded connection is in collet chuck (2) tip promotes through rotating collet nut (1) fluoroplastics pipe to the downthehole removal of centre gripping, centre gripping downthehole wall have a toper inclined plane, are used for fluoroplastics pipe is to the centre gripping hole inner wall removal in-process compression centre gripping fluoroplastics pipe, connecting rod (3) are through adapter (5) connection test tensile machine, the plug has been inserted in the fluoroplastics pipe both ends, the outside winding in fluoroplastics pipe both ends has the sticky tape.
2. A fluoroplastic pipe tensile strength testing apparatus according to claim 1 wherein each end of said fluoroplastic pipe has a first mark disposed at a first distance from the end of said pipe and a second mark disposed at a second distance from the end of said pipe, said second distance being greater than said first distance, said mandrel being inserted from the end of said fluoroplastic pipe and extending into said second mark, and said fluoroplastic pipe extending into said gripping holes of said collet (2) no further than said first mark.
3. A fluoroplastic pipe tensile strength testing apparatus as claimed in claim 2 wherein said tape is wound from the ends of said two ends of said fluoroplastic pipe to said second mark.
4. A fluoroplastic pipe tensile strength testing apparatus according to claim 2 wherein said first distance is 25mm and said second distance is 27 mm.
5. A fluoroplastic pipe tensile strength testing apparatus as claimed in claim 1 wherein said mandrel is fabricated from stainless steel 0Cr18Ni 9.
6. A fluoroplastic pipe tensile strength testing device as claimed in claim 1 wherein said adhesive tape is soft and has a rough surface, and said adhesive tape is wound two times around the outside of both ends of said fluoroplastic pipe.
7. A fluoroplastic pipe tensile strength testing device as claimed in claim 1, wherein the connecting rod (3) is connected with the adapter (5) through a screw.
8. A fluoroplastic pipe tensile strength testing device as claimed in claim 1, wherein the adapter (5) is connected with a test tensile machine through a bolt (6), a nut (7) is further sleeved on the adapter (5), and the nut (7) is located at the lower end of the connection position of the adapter (5) and the test tensile machine and is used for preventing the adapter (5) from shaking relative to the test tensile machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111522805.9A CN114235554A (en) | 2021-12-13 | 2021-12-13 | Fluoroplastic pipe tensile strength testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111522805.9A CN114235554A (en) | 2021-12-13 | 2021-12-13 | Fluoroplastic pipe tensile strength testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114235554A true CN114235554A (en) | 2022-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111522805.9A Pending CN114235554A (en) | 2021-12-13 | 2021-12-13 | Fluoroplastic pipe tensile strength testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114235554A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4026145A (en) * | 1976-04-16 | 1977-05-31 | The United States Of America As Represented By The Secretary Of The Air Force | Hydraulic grip for tubular mechanical properties specimen |
| CN2786611Y (en) * | 2005-01-25 | 2006-06-07 | 济南天辰试验机制造有限公司 | AB type plastic pipe material pressure durable test clamp |
| CN201548453U (en) * | 2009-10-16 | 2010-08-11 | 长春科新试验仪器有限公司 | Clamp for high-temperature tensile test of thin-wall pipe |
| CN202548008U (en) * | 2012-03-22 | 2012-11-21 | 无锡布勒机械制造有限公司 | Clamping device for determining tensile strength of composite fiber tube |
| CN104390856A (en) * | 2014-12-16 | 2015-03-04 | 中国科学院合肥物质科学研究院 | Clamp for metal thin-wall whole segment tube axial tension and compression fatigue test |
| CN208187846U (en) * | 2018-05-29 | 2018-12-04 | 西安热工研究院有限公司 | A kind of full pipe sample stress-rupture tester fixture of small diameter metal thin-wall tube |
| CN211453172U (en) * | 2019-10-12 | 2020-09-08 | 中国石油化工股份有限公司 | Sealing clamp for hydrostatic test of plastic pipe |
-
2021
- 2021-12-13 CN CN202111522805.9A patent/CN114235554A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4026145A (en) * | 1976-04-16 | 1977-05-31 | The United States Of America As Represented By The Secretary Of The Air Force | Hydraulic grip for tubular mechanical properties specimen |
| CN2786611Y (en) * | 2005-01-25 | 2006-06-07 | 济南天辰试验机制造有限公司 | AB type plastic pipe material pressure durable test clamp |
| CN201548453U (en) * | 2009-10-16 | 2010-08-11 | 长春科新试验仪器有限公司 | Clamp for high-temperature tensile test of thin-wall pipe |
| CN202548008U (en) * | 2012-03-22 | 2012-11-21 | 无锡布勒机械制造有限公司 | Clamping device for determining tensile strength of composite fiber tube |
| CN104390856A (en) * | 2014-12-16 | 2015-03-04 | 中国科学院合肥物质科学研究院 | Clamp for metal thin-wall whole segment tube axial tension and compression fatigue test |
| CN208187846U (en) * | 2018-05-29 | 2018-12-04 | 西安热工研究院有限公司 | A kind of full pipe sample stress-rupture tester fixture of small diameter metal thin-wall tube |
| CN211453172U (en) * | 2019-10-12 | 2020-09-08 | 中国石油化工股份有限公司 | Sealing clamp for hydrostatic test of plastic pipe |
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