CN101339108B - Air valve device for stretching experiment - Google Patents
Air valve device for stretching experiment Download PDFInfo
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- CN101339108B CN101339108B CN2008101506068A CN200810150606A CN101339108B CN 101339108 B CN101339108 B CN 101339108B CN 2008101506068 A CN2008101506068 A CN 2008101506068A CN 200810150606 A CN200810150606 A CN 200810150606A CN 101339108 B CN101339108 B CN 101339108B
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- gun tube
- air chamber
- air
- chamber cavity
- end cap
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Abstract
The invention discloses a valve device which is used in a tensile test and which comprises a transmission rod, an incidence rod, a flange, a loading cylinder, a connecting sleeve, a push-pull rod and an accelerating cylinder. The valve device is characterized by comprising an emitting valve, an inlet valve, a sliding block, an air-chamber cavity and a gun tube. The air-chamber cavity is cylindrical; two ends of the air-chamber cavity are sealed by an end cap and form an air chamber with the gun tube; a half of the gun tube is arranged in the air-chamber cavity and the other half extends out of the right end cap of the air-chamber cavity; the sliding block is arranged at the left end of the air-chamber cavity and is sleeved on the gun tube; thus part of the sliding block can move leftwardsand rightwards along the periphery of the gun tube; the radial center of the sliding block on the gun tube is provided with an air intake; the loading cylinder is arranged in the gun tube; the internal circle of the loading cylinder matches the incidence rod in a sliding way; the external circle of the loading cylinder matches the gun tube in a sliding way. Because of the arrangement of the sliding block, the pressure difference on two sides of the sliding block can be applied to the experiment; the sliding block moves coaxially along the incidence rod and the gun tube; the valve device has the advantages of simple operation and high reliability, and prevents the problem of eccentric loading.
Description
Technical field
The present invention relates to a kind of stretching air-valve device, especially for the air-valve device of stretching loading experiment.
Background technology
With reference to Fig. 2, document " Patricia Verleysen; Joris Degrieck; Experimental investigation of thedeformation of Hopkinson bar specimens; International Journal of Impact Engineering[J]; 30 (2004) 239-253 " disclose and a kind of material has been realized the tensile test device of high rate of strain dynamic stretching test usefulness, this device comprises transmission bar 1, incident bar 9, flange 10, loads tube 11, adapter sleeve 14, pull bar 15, acceleration cylinder 16.Transmission bar 1 and incident bar 9 all are placed on the support of platform, and incident bar 9 one ends and flange 10 are connected, and the other end is connected in transmission bar 1 by tensile sample 2.Load tube 11 and be enclosed within on the incident bar 9, and can be along incident bar 9 move left and right.Load on the tube 11 and be fixed with adapter sleeve 14, adapter sleeve 14 and pull bar 15 are fixed together by Metallic rod, and pull bar 15 is connected with piston on the acceleration cylinder 16.When carrying out stretching experiment, acceleration cylinder 16 high-speed driving pull bars 15 drive loading tube 11 and hit flange 10, at this moment on incident bar 9, produce the drawing stress pulse, this drawing stress pulse edge incident bar 9 passes to 2 pairs of tensile samples of tensile sample and loads, by the stress pulse on transmission bar 1 and the incident bar 9 is calculated, can obtain the dynamic stress emergent property of tensile sample 2.
In fact, realize dynamic load, its objective is to make to load tube 11 flanges 10, on incident bar 9, produce a drawing stress pulse along incident bar 9 its rod ends of high-speed impact to tensile sample 2.The disclosed tensile test device structure of document seems simply, but actual fabrication and operation are very complicated.Particularly acceleration cylinder 16 needs a large amount of gases to enter in the acceleration cylinder 16 at initial time, to obtain big thrust will make pull bar 15 produce high-speed motion than short stroke.In actual motion, can only lean on a cover complicated apparatus and acceleration cylinder 16 to be used, to obtain initial high thrust.In addition, pull bar 15 wants strictness and length overall to be about incident-transmission bar parallel motion of 4 meters during experiment, otherwise eccentric push-and-pull athletic meeting causes tensile sample 2 to bear undesirable eccentric load, and occurs easily mistakenly launching.
Summary of the invention
Occur easily mistakenly launching in order to overcome prior art, complicated operation and cause easily sample is produced the eccentric deficiency that loads, the invention provides a kind of air valve device for stretching experiment, pressure reduction by sliding shoe both sides in the cylinder is realized inflation and the big flow gas of snap-out release, this gas directly promotes the coaxial loading tube that is free to slide on incident bar, the loading tube moves to the incident bar end and collides end flange and produces a drawing stress pulse, and this pulse is carried out dynamic load to being connected the middle sample of incident bar and transmission bar.Only need a charge operation when experiment, simple to operate, the reliability height has been avoided eccentric loading problem.
The technical solution adopted for the present invention to solve the technical problems: a kind of air valve device for stretching experiment, comprise transmission bar, incident bar, flange, loading tube, adapter sleeve, pull bar, be characterized in also comprising emission valve, gas admittance valve, sliding shoe, air chamber cavity and gun tube, the air chamber cavity is a cylindrical shape, make by steel, two ends constitute air chamber by left end cap and right end cap sealing with gun tube; Half of barrel length is in the air chamber cavity, and it is coaxial with the air chamber cavity, the left end of gun tube passes the left end cap of air chamber cavity, and seal with soft rubber ring with left end cap, second half of barrel length passes the right end cap of air chamber cavity, and the boss on the dependence gun tube and right end cap seal with soft rubber ring, sliding shoe is made by aluminium alloy, be positioned at the left end of air chamber cavity, be enclosed within on the gun tube, and can move right along gun tube cylindrical partial left, the radial center position of sliding shoe has air admission hole on gun tube, sliding shoe and gun tube have seal groove with the gun tube left side contacted part of boss by O RunddichtringO sealing on sliding shoe, realize sealing by the 2nd O RunddichtringO; Load tube and be positioned at gun tube, interior circle and incident bar are slidingly matched, and slyness movingly in cylindrical and the gun tube; The left end of air chamber cavity is stamped intake and exhaust channel, and air inlet is communicated with air chamber by gas admittance valve, and exhaust is communicated with air chamber by the emission valve.
The invention has the beneficial effects as follows: because the design of sliding shoe utilizes the pressure differential work of sliding shoe both sides when experiment, sliding shoe is coaxial mobile along incident bar and gun tube, and simple to operate, the reliability height has been avoided eccentric loading problem.And sliding shoe moves soon during emission, and the initial openings amount that gases at high pressure enter gun tube is big, has guaranteed that it is a constant pressure and constant accelerator that gases at high pressure enter gun tube promotion loading tube.
Below in conjunction with drawings and Examples the present invention is elaborated.
Description of drawings
Fig. 1 is the structural drawing of air valve device for stretching experiment of the present invention.
Fig. 2 is the structural drawing of prior art tensile test device.
Among the figure, the 1-transmission bar; The 2-tensile sample; 3-launches valve; The 4-gas admittance valve; The 5-sliding shoe; 6-air chamber cavity; The 7-tensimeter; The 8-gun tube; The 9-incident bar; The 10-flange; 11-loads tube; The 12-O-ring seal; The 13-air admission hole; The 14-adapter sleeve; The 15-pull bar; The 16-acceleration cylinder.
Embodiment
With reference to Fig. 1.Air valve device for stretching experiment comprises transmission bar 1, emission valve 3, gas admittance valve 4, sliding shoe 5, air chamber cavity 6, tensimeter 7, gun tube 8, incident bar 9, flange 10, loads tube the 11 and the 2nd O RunddichtringO 12.Air chamber cavity 6 is a cylindrical shape, is made by steel, and two ends constitute air chamber by left end cap 14 and right end cap 15 sealings with gun tube 8.Half of gun tube 8 length is in air chamber cavity 6, and it is coaxial with air chamber cavity 6, the left end of gun tube 8 passes the left end cap 14 of air chamber cavity 6, and seal with left end cap 14 usefulness soft rubber rings, second half of gun tube 8 length passes the right end cap 15 of air chamber cavity 6, and rely on boss and right end cap 15 usefulness soft rubber rings on the gun tube 8 to seal, sliding shoe 5 is made by aluminium alloy, be positioned at the left end of air chamber cavity 6, be enclosed within on the gun tube 8, and can move right along gun tube 8 cylindrical partial left, the radial center position of sliding shoe 5 has air admission hole 13 on gun tube 8, sliding shoe 5 seals by an O RunddichtringO 16 with gun tube 8, with the contacted part of gun tube 8 left side boss seal groove is arranged on sliding shoe 5, realizes sealing by the 2nd O RunddichtringO 12.Load tube 11 and be positioned at gun tube 8, interior circle and incident bar 9 are slidingly matched, and slyness movingly in cylindrical and the gun tube 8.The left end cap 14 of air chamber cavity 6 has intake and exhaust channel, and air inlet is communicated with air chamber by gas admittance valve 4, and exhaust is communicated with air chamber by emission valve 3.
During work: at first close emission valve 3, gases at high pressure enter in the air chamber cavity 6 by gas admittance valve 4, and gas at first enters the cavity on air chamber cavity 6 left sides; Enter in the process at gas, pushed at high pressure sliding shoe 5 moves right, and makes air admission hole 13 sealings on the gun tube 8, and this sealing realizes by O RunddichtringO 12.When tensimeter 7 points out that the pressure of air chamber cavity 6 reaches the predetermined value of establishing, close gas admittance valve 4.Need emission to load tube at 11 o'clock, opened the emission valve 3 of on-off action fast, at this moment because sliding shoe rapid emptying of 5 left side air pressure and reduction, gas pressure in the air chamber cavity 6 is on sliding shoe 5, because sliding shoe 5 left and right sides pressure differential effects, sliding shoe 5 is rapidly to left movement, expose the air admission hole 13 on the gun tube 8, gas in the air chamber cavity 6 just air admission hole from gun tube 8 13 enters and promote to load tube 11 flanges 11 to incident bar 9 right parts and hit, and has realized producing on incident bar 9 function of drawing stress pulse.
Claims (2)
1. air valve device for stretching experiment, comprise transmission bar, incident bar, flange, loading tube, adapter sleeve, pull bar, it is characterized in that: also comprise emission valve, gas admittance valve, sliding shoe, air chamber cavity and gun tube, the air chamber cavity is a cylindrical shape, make by steel, two ends constitute air chamber by left end cap and right end cap sealing with gun tube; Half of barrel length is in the air chamber cavity, and it is coaxial with the air chamber cavity, the left end of gun tube passes the left end cap of air chamber cavity, and seal with soft rubber ring with left end cap, second half of barrel length passes the right end cap of air chamber cavity, and the boss on the dependence gun tube and right end cap seal with soft rubber ring, sliding shoe is made by aluminium alloy, be positioned at the left end of air chamber cavity, be enclosed within on the gun tube, and can move right along gun tube cylindrical partial left, the radial center position of sliding shoe has air admission hole on gun tube, sliding shoe and gun tube have seal groove with the gun tube left side contacted part of boss by O RunddichtringO sealing on sliding shoe, realize sealing by the 2nd O RunddichtringO; Load tube and be positioned at gun tube, interior circle and incident bar are slidingly matched, and slyness movingly in cylindrical and the gun tube; The left end of air chamber cavity is stamped intake and exhaust channel, and air inlet is communicated with air chamber by gas admittance valve, and exhaust is communicated with air chamber by the emission valve.
2. air valve device for stretching experiment according to claim 1 is characterized in that: also comprise the tensimeter that is positioned on the air chamber cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101506068A CN101339108B (en) | 2008-08-13 | 2008-08-13 | Air valve device for stretching experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101506068A CN101339108B (en) | 2008-08-13 | 2008-08-13 | Air valve device for stretching experiment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101339108A CN101339108A (en) | 2009-01-07 |
| CN101339108B true CN101339108B (en) | 2010-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101506068A Expired - Fee Related CN101339108B (en) | 2008-08-13 | 2008-08-13 | Air valve device for stretching experiment |
Country Status (1)
| Country | Link |
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| CN (1) | CN101339108B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076223A (en) * | 2012-12-30 | 2013-05-01 | 南京理工大学 | Launcher based on Hopkinson pull rod test equipment |
| CN104677724B (en) * | 2015-02-13 | 2017-07-04 | 洛阳利维科技有限公司 | The sealing ring of piston in a kind of pneumatic type Hopkinson equipment emitter |
| CN105973731A (en) * | 2016-07-07 | 2016-09-28 | 西南交通大学 | SHTB (Split Hopkinson Tension Bar) device capable of eliminating pre-motion |
| CN109781555B (en) * | 2019-03-11 | 2020-08-28 | 中国科学技术大学 | Experimental device for compress sample at medium strain rate |
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2008
- 2008-08-13 CN CN2008101506068A patent/CN101339108B/en not_active Expired - Fee Related
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| CN101339108A (en) | 2009-01-07 |
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Granted publication date: 20101201 Termination date: 20130813 |