CN102865819A - Low-temperature shrinkage measurement device and measuring method thereof - Google Patents
Low-temperature shrinkage measurement device and measuring method thereof Download PDFInfo
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- CN102865819A CN102865819A CN2012103402642A CN201210340264A CN102865819A CN 102865819 A CN102865819 A CN 102865819A CN 2012103402642 A CN2012103402642 A CN 2012103402642A CN 201210340264 A CN201210340264 A CN 201210340264A CN 102865819 A CN102865819 A CN 102865819A
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Abstract
The invention relates to a low-temperature shrinkage measurement device which comprises laser generators (1), transparent support plates (4) and semi-transparent white paper (5). A plurality of laser generators (1) are arranged vertically, and are fixedly arranged at all corresponding positions of a measured part (7). The transparent support plates (4) are horizontally arranged on the laser generators (1), and the semi-transparent white paper (5) is horizontally arranged on the transparent support plates (4) and is fixedly bonded with the same. The measuring method of the measurement device is that when the measured part (7) is at room temperature, a marker pen is used for describing and recording the outlines of small light spots that the laser generators (1) are projected on the semi-transparent white paper (5); and after the temperature of the measured part (7) drops to target temperature, the outlines of the small light spots that the laser generators (1) are projected on the semi-transparent white paper (5) are described and recorded, and the shrinkage of the measured part (7) at low temperature can be calculated by measuring the deviation distances in the centers of the outlines of the small light spots on the semi-transparent white paper (5).
Description
Technical field
The present invention relates to a kind of measurement mechanism and measuring method thereof, particularly for device and the measuring method thereof of measuring object low-temperature shrink amount.
Background technology
Expanding with heat and contract with cold is the build-in attribute of most of material.Object shrinks to original structure generation tremendous influence at low temperatures.Therefore, in the design of Cryo Equipment, need the strict low-temperature shrink amount of considering used unit.For the parts that the single known materials of a lot of employings is made, its amount of contraction that is cooled to a certain low temperature can be by calculating.But not clear or be composited by multiple material for some parts material therefor compositions, its low-temperature shrink amount just is difficult to obtain by calculating accurately.
A lot of parts need its low-temperature shrink amount of actual measurement.Comparatively simple method commonly used is: parts are put into soak cooling in the cryogenic liquid, change to draw the low-temperature shrink amount of these parts after the cooling by the physical dimension of measurement component.Usually the survey instrument that adopts is conventional measurer (such as slide calliper rule, tape measure etc.), need to touch tested low temperature parts during these conventional gage measurings, and is therefore very inconvenient.In addition, conventional measurer also is cooled when the tested low temperature parts of contact, and measurer itself also cold contraction can occur, and its measuring accuracy will reduce greatly.
Summary of the invention
The objective of the invention is to overcome the poor shortcoming of conventional gage measuring object low-temperature shrink measuring accuracy, propose a kind of new low-temperature shrink measurement mechanism.
Laser has the characteristic of directional lighting, and from the laser that laser instrument sends, the divergence of its light beam is minimum, approximately only has 0.001 radian, near parallel.Commercial laser pen is exactly this characteristic of utilizing laser, with the compact low power Civil Laser of laser as the indication purposes.Measurement mechanism of the present invention will adopt commercial laser pen to measure as main tool.
Measurement mechanism of the present invention is comprised of laser generator, transparent support plate and translucent blank sheet of paper.Laser generator is comprised of laser pen and support bar.Wherein, support bar adopts thermal conductivity to make less than the epoxy material of 0.3W/ (mK).When the lower end of support bar is immersed in the cryogenic liquid, the temperature of the post upper of distance low-temperature liquid coolant end face 0.5m still can be near room temperature.The bottom surface of laser pen and the upper surface of support bar are fixed together, and laser pen and the coaxial placement of support bar, so that the dead in line of the laser that laser pen sends and support bar.A plurality of laser generators are vertically placed, and are fixed on each relevant position of unit under test.If need to measure unit under test amount of contraction along its length, namely with perpendicular two end faces of length direction on each is installed and fixes a laser generator; If need to measure the amount of contraction of unit under test broad ways, namely with perpendicular two end faces of Width on each is installed and fixes a laser generator; Other direction the like.Transparent support plate lie in a horizontal plane in laser generator above, and keep a determining deviation with the top of laser generator.Four of transparent support plate employings vertically stand in the level ground upper supporting column and fix, and guarantee that transparent support plate and level ground relative displacement can not occur.Translucent blank sheet of paper lies in a horizontal plane on the transparent support plate, and translucent blank sheet of paper is pasted and fixed on transparent support plate.
Adopt measurement mechanism measuring process of the present invention as follows, the unit under test that laser generator is installed is placed in the sub-cooled liquid bath, open the laser pen on the laser generator, the laser vertical that allows laser pen send projects on the transparent support plate, little luminous point can occur at translucent blank sheet of paper this moment, adopts marking pen to depict and record the profile of little luminous point on the translucent blank sheet of paper at translucent blank sheet of paper; Then in the sub-cooled liquid bath, inject cryogenic liquid, when the drop in temperature of unit under test behind target temperature, adopt marking pen to depict and record laser projection that laser pen the sends little optical spot profile to the translucent blank sheet of paper at translucent blank sheet of paper, the offset distance of measuring little optical spot profile center on the translucent blank sheet of paper just can calculate unit under test amount of contraction at low temperatures.
Description of drawings
Accompanying drawing 1 is the low-temperature shrink measurement mechanism structural representation of the embodiment of the invention, among the figure: 1 laser generator, 2 laser pens, 3 support bars, 4 transparent support plates, 5 translucent blank sheet of paper, 6 pillars, 7 units under test, 8 cooling liquid baths.
Embodiment
Further specify the present invention below in conjunction with the drawings and specific embodiments.
As shown in drawings, measurement mechanism of the present invention is comprised of laser generator 1, transparent support plate 4 and translucent blank sheet of paper 5.Laser generator 1 is comprised of laser pen 2 and support bar 3.Wherein, support bar 3 adopts thermal conductivity to make less than the epoxy material of 0.3W/ (mK).When the lower end of support bar 3 is immersed in the cryogenic liquid, the temperature of support bar 3 upper ends of distance low-temperature liquid coolant end face 0.5m still can be near room temperature.The upper surface of the bottom surface of laser pen 2 and support bar 3 is fixed together, and laser pen 2 and support bar 3 coaxial placements, so that the dead in line of the laser that laser pen 2 sends and support bar 3.A plurality of laser generators 1 are vertically placed, and are fixed on each relevant position of unit under test 7.If need to measure unit under test 7 amount of contraction along its length, namely with perpendicular two end faces of length direction on each is installed and fixes a laser generator 1; If need to measure the amount of contraction of unit under test 7 broad ways, namely with perpendicular two end faces of Width on each is installed and fixes a laser generator 1; Other direction the like.Transparent support plate 4 lie in a horizontal plane in laser generator 1 above, and keep a determining deviation with the top of laser generator 1.It is fixing that transparent support plate 4 four of employings vertically stand in level ground upper supporting column 6, guarantees that transparent support plate 4 and level ground relative displacement can not occur.Translucent blank sheet of paper 5 lies in a horizontal plane on the transparent support plate 4, and translucent blank sheet of paper 5 is pasted and fixed on transparent support plate 4.
The method of measurement component amount of contraction of the present invention is as follows:
When the low-temperature shrink amount of unit under test 7 is measured, the unit under test 7 that laser generator 1 will be installed first is placed in the sub-cooled liquid bath 8, open the laser pen 2 on the laser generator 1, allowing laser pen 2 send laser vertical projects on the transparent support plate 4, little luminous point can occur at translucent blank sheet of paper 5 this moment, adopts marking pen that the profile of little luminous point on the translucent blank sheet of paper 5 is depicted and is recorded on this translucent blank sheet of paper 5; Then to sub-cooled liquid bath 8 interior injection cryogenic liquids, until the drop in temperature of unit under test 7 behind target temperature, the laser projection that adopts marking pen again laser pen 2 to be sent is depicted and is recorded on this translucent blank sheet of paper 5 to the little optical spot profile on the translucent blank sheet of paper 5, and the offset distance of then measuring little optical spot profile center on the described translucent blank sheet of paper 5 just can calculate unit under test 7 amount of contraction at low temperatures.
Claims (2)
1. a low-temperature shrink measurement mechanism is characterized in that, described measurement mechanism is comprised of laser generator (1), transparent support plate (4) and translucent blank sheet of paper (5); Described laser generator (1) is comprised of laser pen (2) and support bar (3); Described support bar (3) adopts thermal conductivity to make less than the epoxy material of 0.3W/ (mK); The upper surface of the bottom surface of described laser pen (2) and support bar (3) is fixed together, and laser pen (2) and the coaxial placement of support bar (3), so that the dead in line of the laser that laser pen (2) sends and support bar (3); A plurality of described laser generators (1) are vertical to be placed, and is fixed on each relevant position of unit under test (7); Described transparent support plate (4) lie in a horizontal plane in laser generator (1) above, and keep a determining deviation with the top of laser generator (1); It is fixing that four of described transparent support plate (4) employings vertically stand in level ground upper supporting column (6); Described translucent blank sheet of paper (5) lies in a horizontal plane on the transparent support plate (4), and translucent blank sheet of paper (5) is pasted and fixed on transparent support plate (4).
2. adopt the measuring method of measurement mechanism claimed in claim 1, it is characterized in that, when measuring the low-temperature shrink amount of unit under test (7), the unit under test (7) that laser generator (1) at first will be installed is placed in the sub-cooled liquid bath (8), open the laser pen (2) on the laser generator (1), making laser pen (2) send laser vertical projects on the transparent support plate (4), little luminous point can occur this moment on translucent blank sheet of paper (5), adopt marking pen to depict and record the exterior feature wheel of the upper little luminous point of translucent blank sheet of paper (5) at translucent blank sheet of paper (5); Then in sub-cooled liquid bath (8), inject cryogenic liquid, until the drop in temperature of unit under test (7) behind target temperature, adopt marking pen to depict and record laser projection that laser pen (2) the sends little optical spot profile to the translucent blank sheet of paper (5) at translucent blank sheet of paper (5), the offset distance of measuring the upper little optical spot profile center of translucent blank sheet of paper (5) just can calculate unit under test (7) amount of contraction at low temperatures again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103402642A CN102865819A (en) | 2012-09-13 | 2012-09-13 | Low-temperature shrinkage measurement device and measuring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103402642A CN102865819A (en) | 2012-09-13 | 2012-09-13 | Low-temperature shrinkage measurement device and measuring method thereof |
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| CN102865819A true CN102865819A (en) | 2013-01-09 |
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| CN2012103402642A Pending CN102865819A (en) | 2012-09-13 | 2012-09-13 | Low-temperature shrinkage measurement device and measuring method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003096466A (en) * | 2001-09-19 | 2003-04-03 | Kawasaki Steel Corp | Method for measuring shrinkage of coke |
| CN201104239Y (en) * | 2007-10-26 | 2008-08-20 | 东南大学 | Lever type micro-displacement optical measuring device |
| CN201237846Y (en) * | 2007-09-19 | 2009-05-13 | 季倬 | Solid thermal expansion demonstration instrument |
| CN102661737A (en) * | 2012-05-30 | 2012-09-12 | 上海隧道工程股份有限公司 | Automatic group measurement system and automatic group measurement method for settlement deformation of tunnel structure |
-
2012
- 2012-09-13 CN CN2012103402642A patent/CN102865819A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003096466A (en) * | 2001-09-19 | 2003-04-03 | Kawasaki Steel Corp | Method for measuring shrinkage of coke |
| CN201237846Y (en) * | 2007-09-19 | 2009-05-13 | 季倬 | Solid thermal expansion demonstration instrument |
| CN201104239Y (en) * | 2007-10-26 | 2008-08-20 | 东南大学 | Lever type micro-displacement optical measuring device |
| CN102661737A (en) * | 2012-05-30 | 2012-09-12 | 上海隧道工程股份有限公司 | Automatic group measurement system and automatic group measurement method for settlement deformation of tunnel structure |
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Application publication date: 20130109 |