CN102033025A - Rail fatigue tester - Google Patents

Rail fatigue tester Download PDF

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Publication number
CN102033025A
CN102033025A CN 201010515082 CN201010515082A CN102033025A CN 102033025 A CN102033025 A CN 102033025A CN 201010515082 CN201010515082 CN 201010515082 CN 201010515082 A CN201010515082 A CN 201010515082A CN 102033025 A CN102033025 A CN 102033025A
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China
Prior art keywords
push rod
rail
cam
drive motor
control device
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CN 201010515082
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Chinese (zh)
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CN102033025B (en
Inventor
王士明
陈志明
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ZHEJIANG TUGONG INSTRUMENT CO Ltd
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ZHEJIANG TUGONG INSTRUMENT CO Ltd
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Abstract

The invention discloses a rail fatigue tester comprising a frame and a control device, wherein an upper press head, a lower supporting block, a pressure sensor and a variable load device are arranged in the frame; a supporting ball is arranged on the lower supporting block; the variable load device comprises a driving motor, a cam, a supporting rod and a drop limiting block of the supporting rod, wherein the driving motor is connected with the cam in a driving mode, one end of the supporting rod is arranged above the cam, the other end of the supporting rod is supported to the lower side of the lower supporting block, the pressure sensor is fixed at the upper end of the supporting rod, the frame is also provided with a cross rod, the drop limiting block of the supporting rod is arranged on the cross rod, and a lifting device is arranged between the drop limiting block of the supporting rod and the cross rod; and the pressure sensor and the lifting device are respectively and electrically connected with the control device. The rail fatigue tester has the characteristics of simple structure, stable motion, long service life, test accuracy and the like.

Description

A kind of rail fatigue testing machine
Technical field
The present invention relates to a kind of rail test device, a kind of rail fatigue exerciser of more specifically saying so.
Background technology
The fatigue crack of rail can bring very big potential safety hazard to vehicle, therefore, fatigue crack initiation, the spread scenarios of rail is analyzed and researched, and has crucial social effect and economic implications.Torture test to rail is to guarantee one of important step of rail security.
Existing rail fatigue testing machine comprises corresponding frame, and the anchor clamps in the frame, load briquetting and load drive.During torture test, the load that is applied on the rail is the alternation load, with up to a million time be that radix is determined the rail fatigue limit, for the selection of sample, sample quantities, the loading scope, the record of test findings and method for sorting all have defined.Simultaneously, can analyze and research to experimental result, study the rail fatigue performance under the moment of flexure effect in conjunction with optical microscope (OM), microhardness instrument, scanning electron microscope (SEM).
At present, rail fatigue testing machine both domestic and external, its load drives hydraulic-driven and the two kinds of modes of Electromagnetic Drive of adopting mostly, because the rail fatigue test has characteristics such as time dependent loading frequency height, test period length, therefore hydraulic-driven is easy to make the rubber parts of hydropress to damage, even also do not finish the torture test of rail and testing machine itself just needs to repair, instrument then need restart because of a variety of causes quits work to test in official hour.And there is baroque deficiency in Electromagnetic Drive, and test accuracy also awaits further raising.
Summary of the invention
At above-mentioned situation, the problem that quasi-solution of the present invention is determined provides a kind of simple in structure, rail fatigue exerciser that precision is high.
For addressing the above problem, the present invention has adopted following technical scheme: a kind of rail fatigue testing machine, it comprises frame and control device, in described frame, be provided with seaming chuck, following jacking block, pressure transducer and time dependent loading device, described jacking block down is provided with heading, described time dependent loading device comprises drive motor, cam, push rod and push rod whereabouts limited block, described drive motor is connected with cam drive, one end of described push rod is above cam, the other end withstands on down the downside of jacking block, described pressure transducer is fixed on the push rod upper end, described frame also is provided with cross bar, described push rod whereabouts limited block and is provided with jacking gear between push rod whereabouts limited block and the cross bar on cross bar; Described pressure transducer, jacking gear are electrically connected with control device respectively.
The top immobile liquid press of described frame, the output terminal and the seaming chuck of described hydropress are fixed, and described hydropress also is electrically connected with control device.
Described jacking gear can be: it comprises turbine, scroll bar and scroll bar drive motor, described turbine screw thread is fixed on below the limited block of whereabouts, described scroll bar is in transmission connection with turbine, scroll bar drive motor respectively, and described scroll bar drive motor is electrically connected with control device.Described jacking gear can also be a cylinder.
Adopted said structure, when rail fatigue is tested, rail has been placed down in two headings of jacking block, seaming chuck is pressed in the centre of rail.As the maximum pressure of setting the rail fatigue test is F 1, minimum pressure is F 2, then regulate the height of seaming chuck, when making cam maximum radius place withstand on push rod, the pressure that rail is subjected to is F 1, and then regulate jacking gear, and determine the height of push rod whereabouts limited block, the pressure that rail was subjected to when push rod can not be fallen is F 2, it is emphasized that here: the difference of cam maximum radius and least radius is Δ R, the pressure that rail is subjected to is F 1The time and the pressure that is subjected to of rail be F 2The time push rod displacement be Δ L, then must satisfy Δ R greater than Δ L.The rail fatigue testing machine cam of said structure rotates under the drive of drive motor, has realized the test of rail time dependent loading pressure.
Rail fatigue testing machine of the present invention adopts cam variable load structure, and hydropress only is the height of adjusting seaming chuck, the requirement of high-frequency time dependent loading, test period length in the time of satisfying the rail fatigue test.In addition, owing to pressure transducer, jacking gear, hydropress are electrically connected with control device.The maximum pressure that records when pressure transducer is less than F 1The time, by the program setting of control device, the control hydropress reduces the height of seaming chuck, satisfies the maximum pressure that pressure transducer records and equals F 1The minimum pressure that records when pressure transducer is less than F 2The time, by the program setting of control device, the height of control jacking gear rising push rod whereabouts limited block satisfies the minimum pressure that pressure transducer records and equals F 2In sum, rail fatigue testing machine of the present invention has characteristics such as simple in structure, stable, long service life, test accuracy.
Description of drawings
Fig. 1 is the structural representation of rail fatigue testing machine of the present invention;
Fig. 2 is the synoptic diagram of the side of Fig. 1;
Fig. 3 is the structural representation of jacking gear.
Among the figure: 1-frame, 2-control device, 3-seaming chuck, jacking block under the 4-, 5-pressure transducer, 6-drive motor, the 7-cam, 8-push rod, 9-push rod whereabouts limited block, 10-cross bar, 11-hydropress, 12-jacking gear, the 13-turbine, 14-scroll bar, 15-scroll bar drive motor, 16-rail, 17-heading.
Embodiment
As shown in Figure 1 and Figure 2, rail fatigue testing machine of the present invention, it comprises frame 1 and control device 2, is provided with seaming chuck 3, following jacking block 4, pressure transducer 5 and time dependent loading device in described frame 1, described jacking block 4 down is provided with heading 17, and the quantity of heading 17 is generally two.The bottom of rail fatigue test seaming chuck 3 is pressed in the centre of rail 16, and two headings 17 of described jacking block 4 down withstand on the bottom of rail 16 2 sides.The rail fatigue testing machine of said structure and prior art is similar, therefore, no longer launches.
The time dependent loading device of rail fatigue testing machine of the present invention comprises drive motor 6, cam 7, push rod 8 and push rod whereabouts limited block 9, and described drive motor 6 is in transmission connection with cam 7.Drive motor 6 can be selected according to test frequency, when not matching as the rotating speed of drive motor 6 and test frequency, can adopt speed regulator.
The lower end of described push rod 8 above cam 7, the upper end withstands on the down downside of jacking block 4, can push up when rotating with drive motor 6 on the cam 7 like this and move push rod 8, still, in rail fatigue testing machine of the present invention, push rod 8 is not to push up mutually with cam 7 all the time, if the maximum pressure that rail is subjected to is F 1The time and the minimum pressure that is subjected to of rail be F 2The time push rod displacement be Δ L, then only at cam maximum radius R 1With radius at R 1Arc surface between the-Δ L just pushes up mutually with cam 7.
Described pressure transducer 5 is fixed on push rod 8 upper ends, and certain the present invention does not get rid of pressure transducer 5 yet and is fixed on the seaming chuck 3.
Described frame 1 also is provided with cross bar 10, and described push rod whereabouts limited block 9 and is provided with jacking gear 12 between push rod whereabouts limited block 9 and the cross bar 10 on cross bar 10; Described pressure transducer 5, jacking gear 12 are electrically connected with control device 2 respectively.
The top immobile liquid press 11 of described frame 1, the output terminal of described hydropress 11 and seaming chuck 3 are fixing, and described hydropress 11 also is electrically connected with control device 2.
The jacking gear of rail fatigue testing machine of the present invention can be used for reference mechanical industry structures more of the prior art.Jacking gear 12 comprises turbine 13, scroll bar 14 and scroll bar drive motor 15 as described, described turbine 13 is fixed on below the whereabouts limited block 9, described scroll bar 14 is in transmission connection with turbine 13, scroll bar drive motor 15 respectively, and described scroll bar drive motor 15 is electrically connected (referring to Fig. 3) with control device 2.Certain described jacking gear 12 can also be a cylinder.

Claims (4)

1. rail fatigue testing machine, it comprises frame (1) and control device (2), in described frame (1), be provided with seaming chuck (3), following jacking block (4), pressure transducer (5) and time dependent loading device, described jacking block (4) down is provided with heading (17), it is characterized in that described time dependent loading device comprises drive motor (6), cam (7), push rod (8) and push rod whereabouts limited block (9), described drive motor (6) is in transmission connection with cam (7), one end of described push rod (8) is in cam (7) top, the other end withstands on down the downside of jacking block (4), described pressure transducer (5) is fixed on push rod (8) upper end, described frame (1) also is provided with cross bar (10), described push rod whereabouts limited block (9) and is provided with jacking gear (12) between push rod whereabouts limited block (9) and the cross bar (10) on cross bar (10); Described pressure transducer (5), jacking gear (12) are electrically connected with control device (2) respectively.
2. rail fatigue testing machine according to claim 1 is characterized in that the top immobile liquid press (11) of described frame (1), and the output terminal of described hydropress (11) and seaming chuck (3) are fixing, and described hydropress (11) also is electrically connected with control device (2).
3. rail fatigue testing machine according to claim 1 and 2, it is characterized in that described jacking gear (12) comprises turbine (13), scroll bar (14) and scroll bar drive motor (15), described turbine (13) screw thread is fixed on below the whereabouts limited block (9), described scroll bar (14) is in transmission connection with turbine (13), scroll bar drive motor (15) respectively, and described scroll bar drive motor (15) is electrically connected with control device (2).
4. rail fatigue testing machine according to claim 1 and 2 is characterized in that described jacking gear (12) is a cylinder.
CN201010515082A 2010-10-21 2010-10-21 Rail fatigue tester Active CN102033025B (en)

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Application Number Priority Date Filing Date Title
CN201010515082A CN102033025B (en) 2010-10-21 2010-10-21 Rail fatigue tester

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Application Number Priority Date Filing Date Title
CN201010515082A CN102033025B (en) 2010-10-21 2010-10-21 Rail fatigue tester

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CN102033025A true CN102033025A (en) 2011-04-27
CN102033025B CN102033025B (en) 2012-09-05

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103616152A (en) * 2013-12-04 2014-03-05 大连理工大学 Steel rail impact test device and method
CN104101474A (en) * 2013-04-07 2014-10-15 上海理工大学 Wheelchair falling strength testing device
CN108693198A (en) * 2018-03-08 2018-10-23 西南交通大学 A kind of clamping device and synchrotron radiation in situ imaging fatigue tester
CN109556961A (en) * 2018-12-17 2019-04-02 武汉大学 A kind of binary channels dropper fatigue tester
CN111721489A (en) * 2020-05-20 2020-09-29 安徽浦进轨道装备有限公司 Orbital antidetonation test device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443424A (en) * 1967-01-16 1969-05-13 Goodrich Co B F Fatigue testing apparatus
CN2337547Y (en) * 1998-06-15 1999-09-08 李江岩 Fatigue tester
CN1884999A (en) * 2006-06-23 2006-12-27 攀枝花钢铁(集团)公司 Contact fatigue test method for rail
CN101614636A (en) * 2009-06-16 2009-12-30 西南交通大学 Clamp for rail fatigue experiment under the moment of flexure effect
CN201897554U (en) * 2010-10-21 2011-07-13 浙江土工仪器制造有限公司 Testing machine for rail fatigue

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443424A (en) * 1967-01-16 1969-05-13 Goodrich Co B F Fatigue testing apparatus
CN2337547Y (en) * 1998-06-15 1999-09-08 李江岩 Fatigue tester
CN1884999A (en) * 2006-06-23 2006-12-27 攀枝花钢铁(集团)公司 Contact fatigue test method for rail
CN101614636A (en) * 2009-06-16 2009-12-30 西南交通大学 Clamp for rail fatigue experiment under the moment of flexure effect
CN201897554U (en) * 2010-10-21 2011-07-13 浙江土工仪器制造有限公司 Testing machine for rail fatigue

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104101474A (en) * 2013-04-07 2014-10-15 上海理工大学 Wheelchair falling strength testing device
CN103616152A (en) * 2013-12-04 2014-03-05 大连理工大学 Steel rail impact test device and method
CN103616152B (en) * 2013-12-04 2015-08-26 大连理工大学 A kind of steel rail impact test device and method
CN108693198A (en) * 2018-03-08 2018-10-23 西南交通大学 A kind of clamping device and synchrotron radiation in situ imaging fatigue tester
CN108693198B (en) * 2018-03-08 2024-05-14 西南交通大学 Clamping mechanism and synchrotron radiation in-situ imaging fatigue testing machine
CN109556961A (en) * 2018-12-17 2019-04-02 武汉大学 A kind of binary channels dropper fatigue tester
CN111721489A (en) * 2020-05-20 2020-09-29 安徽浦进轨道装备有限公司 Orbital antidetonation test device

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