CN1013060B - Measurement instrument of linear expansion coefficient of plastics - Google Patents
Measurement instrument of linear expansion coefficient of plasticsInfo
- Publication number
- CN1013060B CN1013060B CN 87107877 CN87107877A CN1013060B CN 1013060 B CN1013060 B CN 1013060B CN 87107877 CN87107877 CN 87107877 CN 87107877 A CN87107877 A CN 87107877A CN 1013060 B CN1013060 B CN 1013060B
- Authority
- CN
- China
- Prior art keywords
- quartz
- expansion coefficient
- low temperature
- measuring instrument
- type wire
- 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.)
- Expired
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The present invention relates to a measuring instrument of linear expansion coefficients, particularly to a measuring instrument of the linear expansion coefficients of plastics. The measuring instrument is provided with three quartz dilatometers with high precision and simple and compact structure and a low temperature bath with constant temperature precision superior to that of the US standard and simple structure. Therefore, the testing precision, the work efficiency and the convenient operation degree of the instrument are superior to those of the existing US standard and the existing imported instruments.
Description
The invention relates to type wire expansion coefficient measuring instrument, particularly the invention of measurement instrument of linear expansion coefficient of plastics.Precision height, quartz dilatometer simple and compact for structure being housed and be better than-30 ℃～0 ℃ following constant temperature precision on this analyzer ± 0.2 ℃ (meeting the accuracy requirement of the existing U.S. and West Germany's standard) low temperature simple in structure bathes.
Linear expansion coefficient is the important physical constant of plastic material, and the most frequently used means are these instruments when measuring this physical constant both at home and abroad.The precision of this analyzer depends primarily on quartz dilatometer.And the precision of quartz dilatometer depends primarily on the size of the glade plane space between quartzy inner and outer pipes, avoid as far as possible when operation quartz inner pipe vibration takes place or rock.Another key factor that influences the quartz dilatometer precision be quartz outer tube with clock gauge between be connected, fixing and regulate the structure of part.Certainly, obtain accurate and reliable test data, a comparatively ideal low temperature is bathed and is absolutely necessary.People know, the U.S. in 1970 to its nineteen forty-four research and design connection, the structure fixing and that regulate part of quartz dilatometer carried out big improvement, and the glade plane space between quartzy inner and outer pipes made quantitative regulation (1mm), designed the quite complicated quartz dilatometer of a kind of structure.The connection of the quartz dilatometer of the type wire expansion coefficient measuring instrument that Italy CEAST scientific instrument company sells, fixing and regulate part by the manufacturing of the instrument appropriate section in the Unite States Standard (USS).This part structure complicated causes the increase of dilatometer volume, heaviness and cost height.When test, will with the hands dilatometer be moved on to another thermostatic bath from a thermostatic bath, and three borehole jacks on the seat that need be fixed are on three gib screws at thermostatic bath top.Glade plane space between quartzy in addition inner and outer pipes does not have quantitative control, thus take place unavoidably to vibrate or rock, so test error is bigger.The dilatometer volume is big, can only put one on thermostatic bath, and testing efficiency is low.Two cooling refrigerating machines of this analyzer add that the expense of control section accounts for 1/2nd of whole instrument price, and the constant temperature precision does not reach ± 0.2 ℃ requirement in the time of-30 ℃.In addition, also have the smart mechanism of Japanese Japan to make the type wire expansion coefficient measuring instrument of being produced, it is by the standard manufacture of U.S. nineteen forty-four.The thermostatic control that low temperature is bathed during test is in time to add dry ice in pre-cooled groove methyl alcohol by the temperature variation that the operator demonstrates according to temperature indicator to realize, operation inconvenience, and the constant temperature precision is lower.In addition in the experimentation with a large amount of methyl alcohol and dry ice (, needing 30 liters of methyl alcohol, dry ice 20kg) at-30 ℃ of constant temperature, methyl alcohol is taken out of with great amount of carbon dioxide, influences health.
The purpose of this invention is to provide a kind of type wire expansion coefficient measuring instrument, its quartz dilatometer is simple and compact for structure, can avoid managing in the quartz dilatometer taking place to vibrate or rock, and can test in a thermostatic bath with several quartz dilatometers simultaneously when needing.Another object of the present invention provides a kind of simple in structure, low temperature that the constant temperature precision is high and bathes, thereby makes this analyzer demonstrate precision height, efficient height, easy to operate, advantage such as cost is low.
Accompanying drawing has been described one embodiment of the present of invention.
Accompanying drawing 1: the cut-open view of quartz dilatometer.
Accompanying drawing 2: the partial sectional view of the application's type wire expansion coefficient measuring instrument.A few Zhi Jingdu height, quartz dilatometer (1) simple and compact for structure are arranged on the instrument and bathe (2) for ± 0.2 ℃, low temperature simple in structure-30 ℃～0 ℃ following constant temperature precision.
Accompanying drawing 1 has been described a kind of primary structure of quartz dilatometer.Two special locating rings (4) and (5) have been gluedd joint in its quartz inner pipe (3) upper end, and a special locating ring (6) has been gluedd joint in the lower end.The about 0.1～0.2mm of glade plane space between locating ring and quartz outer tube (7) inwall.Processing several air slots (8) on each locating ring are to eliminate the vapour lock influence.Like this with quartz dilatometer when a thermostatic bath moves on to another thermostatic bath, just can avoid quartz inner pipe that vibration takes place or rock.Another important innovations of the present invention be clock gauge (9) with quartz outer tube (7) between be connected, fixing and regulate the simple and compact for structure of parts, by three critical pieces (making) clock gauge seats (10) round nuts (11) and web member (12) realization with low-expansion alloy.On web member, process several to discharge orifice (13), and make itself and low temperature bath (2) and hyperthermal bath (14) keep suitable distance, to eliminate the influence of high and low temperature bath and environment temperature clock gauge (9) precision.The adjusting of clock gauge (9) gauge head height (for surveying different length sample (15)) is finished jointly by round nut (11), clock gauge seat (10) and web member (12).By the quartz dilatometer that the present invention makes, its precision height, lightly nimble, cost is low, good environmental adaptability, can overlap test simultaneously more.Be particularly suited in the laboratory of no standard environment condition, carrying out the test of degree of precision.The 3rd important innovations of the present invention is to have made a kind of suitable cryosel low temperature simple in structure to bathe, after once preparing, in test period, the constant temperature precision of sample area is better than ± and 0.2 ℃.Compare with existing technical device, cost is very low, and constant temperature precision height (meeting the accuracy requirement of existing Unite States Standard (USS) and West Germany's standard fully).Cryosel refrigerant is to be mixed with by proper proportion by the ice of suitable granularity and 1～2 kind of inorganic salts (as ammonium, sodium, potassium, magnesium, calcium, zinc and molysite etc.).
All be better than the requirement of Unite States Standard (USS) (ASTM/ANSD696-79) and the type wire expansion coefficient measuring instrument that Italian CEAST scientific instrument company sells by measuring accuracy, work efficiency and the convenient degree of operation of the type wire expansion coefficient measuring instrument of manufacturing of the present invention.
Claims (4)
1, a kind of type wire expansion coefficient measuring instrument, measurement instrument of linear expansion coefficient of plastics particularly, mainly form by quartz dilatometer, low temperature bath, hyperthermal bath and temperature control temp measuring system, it is characterized in that: 1) gluedd joint two locating ring (4), (5) that air slot is arranged on quartz inner pipe (3) top of quartz dilatometer (1), a locating ring (6) has been gluedd joint in the lower end, and the glade plane space between locating ring and quartz outer tube (7) inwall is 0.1～0.2mm; 2) low temperature bathe (2) be a constant temperature precision be better than ± 0.2 ℃ cryosel low temperature bathes.
2, according to the type wire expansion coefficient measuring instrument described in the claim 1, it is characterized in that being connected between the quartz outer tube (7) of clock gauge (9) and quartz dilatometer, material fixing and that regulate parts is low-expansion alloy, is processed with several to discharge orifice and make it and high and low temperature is bathed and kept suitable distance on web member (12).Clock gauge (9) gauge head height is regulated and is finished jointly by garden nut (11), clock gauge seat (10) and web member (12).
3,, when also need being, its feature can test in a thermostatic bath with several quartz dilatometers (1) simultaneously according to claim 1 and 2 described type wire expansion coefficient measuring instruments.
4,, it is characterized in that it is that ice and 1～2 kind of inorganic salts by suitable granularity are mixed with by proper proportion that cryosel low temperature is bathed the refrigerant of (2) according to the described type wire expansion coefficient measuring instrument of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107877 CN1013060B (en) | 1987-11-17 | 1987-11-17 | Measurement instrument of linear expansion coefficient of plastics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87107877 CN1013060B (en) | 1987-11-17 | 1987-11-17 | Measurement instrument of linear expansion coefficient of plastics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1033212A CN1033212A (en) | 1989-05-31 |
| CN1013060B true CN1013060B (en) | 1991-07-03 |
Family
ID=4816272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87107877 Expired CN1013060B (en) | 1987-11-17 | 1987-11-17 | Measurement instrument of linear expansion coefficient of plastics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013060B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425977C (en) * | 2004-11-22 | 2008-10-15 | 中国科学院理化技术研究所 | Method for measuring polymer-base foam material linear expansion coefficient by displacement sensor |
| CN102384966B (en) * | 2010-09-03 | 2015-01-14 | 毕宏峰 | High-temperature high-pressure linear expansion measuring instrument |
| CN102323291A (en) * | 2011-05-19 | 2012-01-18 | 广东成德电路股份有限公司 | A kind of linear expansivity measuring instrument |
| CN102253074B (en) * | 2011-05-31 | 2013-06-26 | 哈尔滨工业大学 | Measuring device and method for measuring coefficient of metal linear expansion by Doppler vibration lens sine modulation multi-beam laser heterodyning secondary harmonics |
| US8992077B2 (en) * | 2013-03-07 | 2015-03-31 | Quantum Design International, Inc. | Ultrasensitive ratiometric capacitance dilatometer and related methods |
| CN103940841B (en) * | 2014-02-18 | 2016-03-02 | 超威电源有限公司 | A kind of Lead Acid Battery Used for Electric Vehicle moulds the method for testing of shell thermal deformation |
| CN106918619A (en) * | 2017-03-28 | 2017-07-04 | 哈尔滨工业大学 | A kind of solid material linear expansion coefficient test device |
| CN113791112B (en) * | 2021-09-23 | 2022-04-15 | 北京科技大学 | Method and system for testing linear expansion coefficient of wooden cultural relic by using static thermomechanical analyzer |
-
1987
- 1987-11-17 CN CN 87107877 patent/CN1013060B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1033212A (en) | 1989-05-31 |
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