CN111141600A - Compact pipeline test piece fatigue test system - Google Patents
Compact pipeline test piece fatigue test system Download PDFInfo
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- CN111141600A CN111141600A CN201911422779.5A CN201911422779A CN111141600A CN 111141600 A CN111141600 A CN 111141600A CN 201911422779 A CN201911422779 A CN 201911422779A CN 111141600 A CN111141600 A CN 111141600A
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- clamping block
- test piece
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- connecting plate
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- 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
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- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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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 invention discloses a fatigue test system for a compact pipeline test piece, which comprises a servo actuating system, connecting clamps, a gravity balancing rod, a gravity balancer, the compact pipeline test piece clamp and the compact pipeline test piece, wherein the connecting clamps are arranged in pairs, and the fatigue life of the pipeline test piece is evaluated by measuring the reciprocating cycle number of the pipeline test piece.
Description
Technical Field
The invention belongs to the field of pipeline fatigue testing, and particularly relates to a compact pipeline test piece fatigue testing system.
Background
At present, the fatigue life evaluation methods of petroleum and natural gas pipelines mainly comprise two methods: the first method is a small-sized test piece method, in which a small test piece, such as a fatigue test piece used in the american test standard (ASTM), is cut out from a pipe to evaluate the fatigue life of the pipe, but the small-sized test piece method cannot accurately evaluate the fatigue life of the pipe because the shape and loading manner of the test piece have a great influence on the result of the fatigue life test. The second method adopted at present is a full-size pipeline test method, namely, a fatigue test is carried out on the actually used pipeline by directly simulating the working load to obtain the fatigue life of the pipeline, but the full-size pipeline test is expensive and complex to operate. CN104535433A discloses a full-size pipeline fatigue test operation platform, this platform has two servo actuating systems, after loading the pipeline sample, can realize the three point and four point bending developments of pipeline sample, static coordination loading or individual loading, and each part is made by whole casting girder steel, and the platform structure is complicated, and the running cost is high, is difficult to use on a large scale. Therefore, a new test method needs to be developed, which can effectively simulate the loading mode of the actual pipeline, reduce the test cost and simplify the test operation.
Disclosure of Invention
The invention provides a fatigue test system for a compact pipeline test piece, which can effectively simulate a loaded mode under the actual pipeline working condition to carry out a fatigue life test on an oil and gas pipeline, and can also reduce the test cost and the requirements of the test on test equipment, test space, test personnel and the like.
The purpose of the invention is realized by adopting the following technical scheme:
the invention discloses a compact pipeline fatigue test piece testing system which comprises a servo actuating system (1), connecting clamps (2), a gravity balancing rod (3), a gravity balance object (4), compact pipeline test piece clamps (5) and compact pipeline test pieces (6), wherein the connecting clamps are arranged in pairs;
the servo actuating system (1) comprises a servo valve, a load sensor, a servo actuator and two transmission rods, wherein the two transmission rods are respectively connected with the load sensor and the servo actuator, the unconnected ends of the two transmission rods are respectively connected with two paired connecting clamps through threads, and the two transmission rods are positioned on the same vertical line, so that no unbalance load is generated in the test process;
the connecting clamp is provided with a threaded hole in the middle and is connected with a servo actuating system transmission rod, the connecting clamp is provided with through holes on the left and right, the connecting clamp is connected with the through holes on the loading rod of the compact pipeline test piece clamp through bolts, the bolt connection can effectively transmit the up-and-down movement of the transmission rod, and meanwhile, the relative rotation of the loading rod is allowed;
the gravity balance rod is connected with the loading rod through a bolt and is matched with a gravity balance object to balance the gravity of the compact pipeline test piece.
The compact pipeline test piece clamp comprises a clamping block 8, a connecting plate 9, a loading rod 10, a connecting block 11, a ring cover 12 and a large bolt 13, a clamping hole is arranged in the middle of the clamping block 8, the pipeline test piece 6 is sleeved in the clamping hole of the clamping block 8, the bottom of the clamping block 8 is provided with a screw through hole, the large bolt 13 is arranged in the screw hole and screwed or unscrewed to tighten or loosen the clamping hole of the clamping block 8, so that the clamping block 8 tightens the pipeline test piece 6, the connecting plate 9 is arranged on the loading rod 10, the connecting plate 9 is used for connecting the top of the clamping block, the connecting block 11 is arranged at the bottom of the loading rod 10, the connecting block 11 is used for connecting the bottom of the clamping block 8, a ring cover 12 is arranged on one side of the clamping block 8, the ring cover 12 is fixed on the clamping block 8 through bolts, and the compact pipeline test piece clamps are arranged in pairs;
furthermore, a groove is formed in the part, clamping the pipeline test piece 6, of the clamping block 8, and a clamping ring 7 is arranged on the groove and used for fixing the pipeline test piece by the forced clamping block 3, so that the problems of sideslip, falling off and the like in the test process are prevented, and unreal data or experimental failure is caused;
furthermore, a convex block is arranged at the top of the clamping block 8, a snap ring is arranged on the connecting plate 9, when the connecting plate 9 is connected with the clamping block 8, the snap ring is buckled into the convex block, the convex block can be fixedly connected and simultaneously prevent a bolt from being buckled, so that equipment is damaged, and the loading rod 10 is connected with a transmission rod of a servo actuating system to perform reciprocating motion.
Furthermore, the tops of the connecting plate 9 and the clamping block 8 are respectively provided with a corresponding screw hole, and when the connecting plate 9 is connected with the clamping block 8, a bolt is screwed into the screw holes.
Compact pipeline test piece anchor clamps assembly order:
A. the pipeline test piece 6 is sleeved in the clamping block 8;
B. a pair of clamping rings 7 are sleeved in the groove of the pipeline test piece 6,
C. the big bolt 13 is tightened to ensure that the clamping hole has no gap;
D. fixing the ring cover 12 to the clamping block 8 through the peripheral bolt holes thereof;
E. the two connecting blocks 11 are respectively fixed at two ends of the loading rod 10 through bolts;
F. the loading rod 10 and the clamping block 8 are fixed through a connecting plate 9;
G. the bolt is used for fixing the connecting block 11 and the clamping block 8;
H. repeating the above steps to connect additional sets of the compact pipe test piece clamps;
furthermore, the clamping ring 7 is divided into two halves, so that the fixing requirement is met, and the assembly and disassembly are convenient.
Furthermore, a convex block is arranged above the clamping block 8 and is used as a stress part which is matched with the connecting plate, so that the load on the loading rod is effectively transferred to the clamping block 8.
Further, the two connecting blocks are matched, the loading rod is positioned in the middle of the clamping block, and the load is ensured to be applied to the center line of the pipe fitting.
The fatigue test system for the compact pipeline test piece at least has the following advantages:
1. the compact pipeline test piece can simulate the actual pipeline loading modes under different working conditions by adjusting the length of the loading rod and adjusting the bending moment and the tensile load ratio;
2. the system is simple in installation and structure, can reduce the test cost and reduce the requirements of the test on experimental equipment, test space, testers and the like;
3. the system can be based on a commonly used servo actuation system in a laboratory, and the pipeline fatigue setting is widely applied to the laboratory, so that the research and development efficiency is greatly improved, and the test cost is reduced.
Drawings
FIG. 1 is a schematic view of a compact pipe fatigue test piece testing system of the present invention;
FIG. 2 is a schematic view of a compact pipe test piece of the present invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
A compact pipeline fatigue test piece testing system comprises a servo actuating system (1), a connecting clamp (2), a gravity balance rod (3), a gravity balance object (4), a compact pipeline test piece clamp (5) and a compact pipeline test piece (6), wherein the connecting clamp and the compact pipeline test piece clamp are arranged in pairs;
the servo actuating system (1) comprises a servo valve, a load sensor, a servo actuator and two transmission rods, wherein the two transmission rods are respectively connected with the load sensor and the servo actuator, the unconnected ends of the two transmission rods are respectively connected with two paired connecting clamps through threads, and the two transmission rods are positioned on the same vertical line, so that no unbalance load is generated in the test process;
the middle of the connecting clamp is provided with a threaded hole and is connected with a retransmission rod of a servo actuating system, the left and right of the connecting clamp are provided with through holes, the connecting clamp is connected with the through holes on the loading rod of the compact pipeline test piece clamp through bolts, the bolt connection can effectively transmit the up-and-down movement of the transmission rod, and meanwhile, the relative rotation of the loading rod is allowed;
the gravity balance rod is connected with the loading rod through a bolt and is matched with a gravity balance object to balance the gravity of the compact pipeline test piece,
the compact pipeline test piece comprises a clamping block 8, a connecting plate 9, a loading rod 10, connecting blocks 11, ring covers 12 and large bolts 13, wherein a clamping hole is formed in the middle of the clamping block 8, the pipeline test piece 6 is sleeved into the clamping hole of the clamping block 8, a screw hole is formed in the bottom of the clamping block 8, the large bolts 13 are arranged in the screw hole and screwed or unscrewed to enable the clamping hole of the clamping block 8 to be tightened or loosened, so that the pipeline test piece 6 is tightened by the clamping block 8, the connecting plate 9 is arranged on the loading rod 10, the connecting plate 9 is used for connecting the top of the clamping block, the connecting blocks 11 are arranged at the bottom of the loading rod 10, the connecting blocks 11 are used for connecting the bottom of the clamping block 8, the ring covers 12 are arranged on one side of the clamping block 8, the ring covers 12 are fixed on the clamping block 8 through bolts, and the compact pipeline test piece;
preferably, a groove is formed in the part, clamped by the clamping block 8, of the pipeline test piece 6, and a clamping ring 7 is arranged on the groove and used for fixing the pipeline test piece by the forced clamping block 3, so that the problems of sideslip, falling off and the like in the test process are prevented, and unreal data or experiment failure is caused;
preferably, a convex block is arranged at the top of the clamping block 8, a snap ring is arranged on the connecting plate 9, when the connecting plate 9 is connected with the clamping block 8, the snap ring is buckled into the convex block, the convex block can be fixedly connected and simultaneously prevent a bolt from being loosened to cause equipment damage, wherein the loading rod 10 is connected with a transmission rod of a servo actuating system through a connecting clamp, and the transmission rod moves up and down in a reciprocating mode.
Preferably, the top of the connecting plate 9 and the top of the clamping block 8 are provided with corresponding screw holes, and when the connecting plate 9 is connected with the clamping block 8, bolts are screwed into the screw holes.
Preferably, the compact pipe test piece clamp assembly sequence is as follows:
A. the pipeline test piece 6 is sleeved in the clamping block 8;
B. a pair of clamping rings 7 are sleeved in the groove of the pipeline test piece 6,
C. the big bolt 13 is tightened to ensure that the clamping hole has no gap;
D. fixing the ring cover 12 to the clamping block 8 through the peripheral bolt holes thereof;
E. the two connecting blocks 11 are respectively fixed at two ends of the loading rod 10 through bolts;
F. the loading rod 10 and the clamping block 8 are fixed through a connecting plate 9;
G. the bolt is used for fixing the connecting block 11 and the clamping block 8;
H. repeating the above steps to connect additional sets of the compact pipe test piece clamps;
preferably, the clamping ring 7 is divided into two halves, so that the fixing requirement is met, and the clamping ring is convenient to assemble and disassemble.
Preferably, a convex block is arranged above the clamping block 8 and is used as a stress part and matched with the connecting plate to effectively transfer the load on the loading rod to the clamping block 8.
Preferably, the two connecting blocks cooperate to position the load bar intermediate the gripping blocks to ensure that the load is applied to the pipe centerline.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (9)
1. A fatigue test system for a compact pipeline test piece is characterized by comprising a servo actuating system (1), connecting clamps (2), a gravity balance rod (3), a gravity balance object (4), a compact pipeline test piece clamp (5) and a compact pipeline test piece (6), wherein the connecting clamps are arranged in pairs;
the servo actuating system (1) comprises a servo valve, a load sensor, a servo actuator and two transmission rods, wherein the two transmission rods are respectively connected with the load sensor and the servo actuator, the unconnected ends of the two transmission rods are respectively connected with two paired connecting clamps through threads, and the two transmission rods are positioned on the same vertical line, so that no unbalance load is generated in the test process;
the middle of the connecting clamp is provided with a threaded hole and is connected with a retransmission rod of a servo actuating system, the left and right of the connecting clamp are provided with through holes, the connecting clamp is connected with the through holes on the loading rod of the compact pipeline test piece clamp through bolts, the bolt connection can effectively transmit the up-and-down movement of the transmission rod, and meanwhile, the relative rotation of the loading rod is allowed;
the gravity balance rod is connected with the loading rod through a bolt and is matched with a gravity balance object to balance the gravity of the compact pipeline test piece.
2. The system of claim 1, wherein the compact pipe test piece clamp comprises a clamping block (8), a connecting plate (9), a loading rod (10), a connecting block (11), a ring cover (12) and a large bolt (13), wherein a clamping hole is formed in the middle of the clamping block (8), a pipe test piece (6) is sleeved in the clamping hole of the clamping block (8), a through hole is formed in the bottom of the clamping block (8), the large bolt (13) is arranged in the through hole and screwed or unscrewed to tighten or loosen the clamping hole of the clamping block (8), the connecting plate (9) is arranged on the loading rod (10), the connecting plate (9) is used for connecting the top of the clamping block, the connecting block (11) is arranged at the bottom of the loading rod (10), the connecting block (11) is used for connecting the bottom of the clamping block (8), the ring cover (12) is arranged on one side of the clamping block (8), the ring cover (12) is fixed on the clamping block (8) through bolts.
3. The system as claimed in claim 2, characterized in that the part of the clamping block (8) that clamps the pipe test piece (6) is provided with a groove, on which a clamping ring (7) is arranged for fixing the pipe test piece by the clamping block (3).
4. The system according to claim 1, characterized in that a convex block is arranged on the top of the clamping block (8), the connecting plate (9) is provided with a snap ring, when the connecting plate (9) is connected with the clamping block (8), the snap ring is buckled into the convex block, the convex block can prevent a bolt from tripping and causing equipment damage while being fixedly connected, and the loading rod (10) is connected with the servo actuating system transmission rod through a connecting clamp.
5. The system according to claim 1, characterized in that the top of the connecting plate (9) and the top of the clamping block (8) are provided with corresponding screw holes, and when the connecting plate (9) is connected with the clamping block (8), the bolts are screwed into the screw holes.
6. System according to claim 1, characterized in that the clamping block (8) is internally provided with an annular groove for gripping the clamping ring (2).
7. The system as claimed in claim 1, wherein the clamping block (8) is provided with a projection at the top, the connecting plate (9) is provided with a snap ring, and the snap ring is snapped into the projection when the connecting plate (9) is connected to the clamping block (8).
8. The system according to claim 1, characterized in that the connecting block (11) is provided with a plurality of pieces, the connecting block (11) and the clamping block (8) being fixed by means of bolts.
9. A system according to claim 1, wherein the clamping ring (7) is divided into two halves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422779.5A CN111141600A (en) | 2019-12-31 | 2019-12-31 | Compact pipeline test piece fatigue test system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422779.5A CN111141600A (en) | 2019-12-31 | 2019-12-31 | Compact pipeline test piece fatigue test system |
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| CN111141600A true CN111141600A (en) | 2020-05-12 |
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| CN201911422779.5A Pending CN111141600A (en) | 2019-12-31 | 2019-12-31 | Compact pipeline test piece fatigue test system |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102012292A (en) * | 2010-09-30 | 2011-04-13 | 清华大学 | Device for measuring micro thrust of engine |
| CN202485997U (en) * | 2012-03-28 | 2012-10-10 | 天津大学 | Superminiature minimally-invasive high-temperature creep fatigue testing machine |
| CN103163032A (en) * | 2013-03-29 | 2013-06-19 | 四川大学 | System and method for detecting fatigue strength of steel beam of corrugated steel web |
| CN103234836A (en) * | 2013-05-15 | 2013-08-07 | 中国航空动力机械研究所 | Flash ranging loading device |
| CN104931366A (en) * | 2015-06-08 | 2015-09-23 | 天津大学 | Fretting fatigue testing method allowing contact load to be adjusted in real time and testing machine adopting fretting fatigue testing method |
| US20160003721A1 (en) * | 2014-07-01 | 2016-01-07 | Research & Business Foundation Sungkyunkwan University | Tension and compression tester for fracture stress test of compact pipe sample |
| CN105527157A (en) * | 2015-12-24 | 2016-04-27 | 北京航空航天大学 | Rapid-assembling and dissembling split clamp used for fatigue test |
| CN108151862A (en) * | 2018-02-11 | 2018-06-12 | 苏州市计量测试研究所 | A kind of counterweight for electronic crane scale detection device loads zero balance device |
| CN110579418A (en) * | 2019-11-06 | 2019-12-17 | 合肥工业大学 | lever loading type friction wear testing machine capable of controlling magnetic field environment |
-
2019
- 2019-12-31 CN CN201911422779.5A patent/CN111141600A/en active Pending
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| RU2140066C1 (en) * | 1998-04-06 | 1999-10-20 | Кубанский государственный технологический университет | Machine to test samples for friction-mechanical fatigue |
| CN101236148A (en) * | 2008-03-06 | 2008-08-06 | 上海交通大学 | Rotary bending fatigue tester |
| CN101532931A (en) * | 2009-04-17 | 2009-09-16 | 中国科学院武汉岩土力学研究所 | Experimental method of simulating dynamic and static load and device thereof |
| CN101526463A (en) * | 2009-04-23 | 2009-09-09 | 哈尔滨工业大学 | Experimental apparatus for testing sliding friction property of friction materials |
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Application publication date: 20200512 |