CN202442982U - Metal wire expansion coefficient experiment instrument - Google Patents
Metal wire expansion coefficient experiment instrument Download PDFInfo
- Publication number
- CN202442982U CN202442982U CN2012200574341U CN201220057434U CN202442982U CN 202442982 U CN202442982 U CN 202442982U CN 2012200574341 U CN2012200574341 U CN 2012200574341U CN 201220057434 U CN201220057434 U CN 201220057434U CN 202442982 U CN202442982 U CN 202442982U
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- copper sleeve
- lever
- metal wire
- experiment instrument
- push rod
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- A Measuring Device Byusing Mechanical Method (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The utility model discloses a metal wire expansion coefficient experiment instrument. The metal wire expansion coefficient experiment instrument measures metal wire expansion coefficients by being coordinated with a displacement measurement mechanism of a high-sensitivity Hall displacement sensor in a mode that water in a water tank is heated through an electric heat pipe, and a tested material is heated through produced steam. The defect that a mechanical dial indicator used in the prior art has low sensitivity and large errors during displacement measurement is overcome, and the defect that the tested material heated by using air causes large temperature measuring errors is overcome. The metal wire expansion coefficient experiment instrument is improved based on the prior art, and the measurement accuracy of the experiment instrument is improved.
Description
Technical field
The utility model relates to a kind of experimental apparatus, especially refers to a kind of expansion coefficients of metal wire experiment instrument.
Background technology
The expansion coefficients of metal wire experiment instrument is a kind of experiment instrument of in the Physical Experiment of colleges and universities linear expansion coefficient being measured, and it can make quantitative measurment to the characteristic of expanding with heat and contract with cold of metal, and can do accurate measurement to the linear expansion coefficient of metal and calculate.Material is in certain temperature range; Former length is that the object of the ι back elongation
that is heated is approximated to direct ratio with the recruitment
of its temperature; Also be directly proportional i.e.:
=
with former long ι.α is a linear expansion coefficient of solid in the formula, and the linear expansion coefficient of different materials is different.The expansion coefficients of metal wire experiment instrument structure of prior art mainly is the Electric heating with controllable temperature; The copper sleeve of heated sealant; Have in the copper sleeve to prevent the crooked orienting lug of tested Metallic rod (or claiming measured material), tested Metallic rod is just passed orienting lug and is placed in the copper sleeve, and temperature is along with the temperature in the copper sleeve rises synchronously; Tested Metallic rod is elongation just; And that copper sleeve one end withstands on top is inactive, and its other end elongation passes to mechanical dial gauge through push rod and reads, but the measuring accuracy of mechanical dial gauge is limited; Directly utilize the tested Metallic rod mode of transfer of air heat in addition, it is long to reach heat balance time in the copper sleeve, and the thermometric error of tested Metallic rod is bigger.
Summary of the invention
The purpose of the utility model provide a kind of measured material be heated elongation and temperature survey accurately, for the well-to-do expansion coefficients of metal wire experiment instrument of measured material length requirement.
In order to achieve the above object; The utility model comprises base casing (19), and the temperature signal input end of electrical heating controller (1) links to each other with temperature sensor (14), and the output terminal of electrical heating controller (1) links to each other with electrothermal tube (2); Copper sleeve (3) is fixed on the base casing (19) through support (18); There is heat-insulation layer (25) copper sleeve (3) outside, and copper sleeve (3) internal fixation is to guide block (12), and measured material (13) places in the copper sleeve (3) through orienting lug (12); Copper sleeve (3) two ends are left end cap (24) and right end cap (26) fixedly; Top (11) but screwing type be fixed on that left end cap (24) is gone up and contact with the left end of measured material (13), electrothermal tube (2) places in the water tank (22), steam pipe (9) lower end communicates with water tank (22); Steam pipe (9) upper end communicates with copper sleeve (3); Return pipe (10) lower end communicates with water tank (22), and return pipe (10) upper end communicates with copper sleeve (3), and the upper end of lever (6) and hall displacement transducer (4) fix; The lower end of lever (6) links to each other with the rotating shaft plate through rotating shaft (17); Carriage (23) all is fixed on above the base casing (19) with rotating shaft plate (16), and extension spring (15) is installed between carriage (23) and the lever (6), and the left end of push rod (21) inserts right end cap (26) center pit right-hand member also interior and measured material (13) and contacts; The right-hand member of push rod (21) passes the hole of carriage (23) and pushes up the left surface of lever (6); Hall displacement transducer (4) places between magnet (5) and the magnet (27), and milivoltmeter (7) links to each other with hall displacement transducer (4), has air hole (28) on the orienting lug (12).
Cause the crooked errors caused of lever (6) for fear of extension spring (15), extension spring (15) is sleeved on the push rod (21), and the right-hand member of extension spring (15) overlaps with the right-hand member of push rod (21) with the tie point of lever (6).
Because the utility model utilizes the water vapor heating measured material of controllable temperature, reduce inner all parts of copper sleeve and reached the thermally equilibrated time, the temperature of the feasible measured material of measuring is more accurate.Hall displacement transducer is used in the measurement of measured material elongation; Add hall displacement transducer and be installed on the lever with displacement amplification, extension spring is installed between carriage and the lever, and is sleeved on the push rod; This just increases substantially than the measurement sensitivity of mechanical dial gauge; Make the measuring accuracy of the elongation that is heated of measured material be significantly increased, and the measured material length requirement is become well-to-do, make that experiment is more convenient.
Description of drawings
Fig. 1 is the structure principle chart of the utility model.
Embodiment
In the base casing 19 among Fig. 1, power switch K, milivoltmeter 7, electrical heating controller 1, water tank 22 are arranged, electrothermal tube 2 and water are arranged in the water tank.Attaching plug links to each other with the power input of electrical heating controller 1 through power switch K.The output terminal of electrical heating controller 1 links to each other with electrothermal tube 2, and the temperature signal input end of electrical heating controller 1 links to each other with temperature sensor 14, and the output end of stabilized voltage supply of electrical heating controller 1 links to each other with milivoltmeter 7.The input end of milivoltmeter 7 and hall displacement transducer 4 used working power output terminals link to each other (wherein each bar thick line representes that lead has two or more among Fig. 1) with hall displacement transducer 4 respective terminal.Copper sleeve 3 is fixed on the base casing 19 with screw through support 18 (about respectively have).Copper sleeve 3 outside surfaces have heat-insulation layer 25, and its two ends are equipped with left end cap (24) and right end cap (26).Copper sleeve 3 internal fixation have the 1-3 group to prevent that measured material 13 is because of stressed and crooked orienting lug 12; Orienting lug 12 is the circular discoid coaxial with copper sleeve 3; Have air hole 28 above the orienting lug 12; The central opening left side of orienting lug 12 is bigger than right side diameter, is a pyramid type from left to right, so that measured material 13 therefrom passes.The left end of push rod 21 inserts in the center hole of right end cap 26, and contacts with measured material 13.Top 11 and left end cap 24 center pits between the screw structural of interlock is arranged, top 11 can screw with left end cap 24, and contact with measured material 13 left ends.Top 11 with push rod 21 all be that the material of poor thermal conductivity is processed.Extension spring 15 is enclosed within the right-hand member of push rod 21, and end fixes with carriage 23, lever 6 respectively about extension spring 15, and the right-hand member of extension spring 15 overlaps with the right-hand member force position of push rod 21 with the tie point of lever 6 basically.The right-hand member of push rod 21 passes the circular hole of carriage 23 and contacts (can skid and directly not fix) with the left side of lever 6.Because extension spring 15 is to be sleeved on the push rod 21; And the right-hand member of extension spring 15 overlaps with the right-hand member of push rod 21 with the tie point of lever 6; This just makes the tension point of extension spring 15 and the top point of force application of push rod 21 act on the same point of lever 6 measuring error that lever 6 bendings of having avoided pulling force and top power not to cause in same point cause.When measured material 13 receives thermal elongation; Promote levers 6 through push rod 21 and do minor rotation (can regard small translation to the right as) for the axial right side, will cause that hall displacement transducer 4 does bigger moving right, thereby amplify displacement with rotating shaft 17; Improved detection sensitivity; This amplifies more effective than electric signal, because of electric signal amplifies noise is arranged, and just the optical zoom as video camera is clear the same more than Digital Zoom for this.Lever 6 measured materials 13 place in the copper sleeve 3 through orienting lug 12.The lower end of steam pipe 9 communicates with water tank 22, and steam pipe 9 upper ends communicate with copper sleeve 3, and return pipe 10 lower ends communicate with water tank 22, and return pipe 10 upper ends communicate with copper sleeve 3.The upper end of lever 6 and hall displacement transducer 4 fix, and the lower end of lever 6 links to each other with rotating shaft plate movable through rotating shaft 17.Carriage 23 all is fixed on above the base casing 19 with rotating shaft plate 16.Hall displacement transducer 4 places between magnet 5 and the magnet 27, and the polarity of magnet 5 and magnet 27 is installed relatively and apart near as far as possible, can be produced stronger non-uniform magnetic-field, to improve detection sensitivity.Have temperature display 8 on the panel of electrical heating controller 1.Transparent box 20 is used to protect the parts in it, and can show the student to see internal structure, helps students understand apparatus structure and principle.
The utility model course of work is following: water in electrothermal tube 2 heating water tank 22 and seething with excitement, and water vapour imports in the copper sleeves 3 through steam pipe 9, and the water of condensation is through return pipe 10 reflow tanks.Water vapor heating measured material 13; Measured material 13 extends because of being heated; Make lever 6 turn right through push rod 21 and the pulling force that overcomes extension spring 15; Cause moving right in hall displacement transducer 4 non-uniform magnetic-field that the zone forms between magnet 5 and magnet 27, produce Hall displacement voltage, input milivoltmeter 7 is read.So repeatedly, change the output power of different electrical heating controllers 1, obtain different temperature in the copper sleeve 3, data respectively organized in record, but meter is calculated the linear expansion coefficient of metal.Because the cooperation of extension spring 15 in usable range, can make the different measured material of length 13 can hold out against push rod 21 and experimentize, and is well-to-do for the measured material length requirement, made things convenient for experimental implementation.
Claims (2)
1. expansion coefficients of metal wire experiment instrument; Comprise base casing (19), the temperature signal input end of electrical heating controller (1) links to each other with temperature sensor (14), and the output terminal of electrical heating controller (1) links to each other with electrothermal tube (2); Copper sleeve (3) is fixed on the base casing (19) through support (18); There is heat-insulation layer (25) copper sleeve (3) outside, and copper sleeve (3) internal fixation is to guide block (12), and measured material (13) places in the copper sleeve (3) through orienting lug (12); Copper sleeve (3) two ends are left end cap (24) and right end cap (26) fixedly; Top (11) but screwing type be fixed on that left end cap (24) is gone up and contact with the left end of measured material (13), it is characterized in that electrothermal tube (2) places in the water tank (22), steam pipe (9) lower end communicates with water tank (22); Steam pipe (9) upper end communicates with copper sleeve (3); Return pipe (10) lower end communicates with water tank (22), and return pipe (10) upper end communicates with copper sleeve (3), and the upper end of lever (6) and hall displacement transducer (4) fix; The lower end of lever (6) links to each other with the rotating shaft plate through rotating shaft (17); Carriage (23) all is fixed on above the base casing (19) with rotating shaft plate (16), and extension spring (15) is installed between carriage (23) and the lever (6), and the left end of push rod (21) inserts right end cap (26) center pit right-hand member also interior and measured material (13) and contacts; The right-hand member of push rod (21) passes the hole of carriage (23) and pushes up the left surface of lever (6); Hall displacement transducer (4) places between magnet (5) and the magnet (27), and milivoltmeter (7) links to each other with hall displacement transducer (4), has air hole (28) on the orienting lug (12).
2. by the described expansion coefficients of metal wire experiment instrument of claim 1, it is characterized in that extension spring (15) is to be sleeved on the push rod (21), the right-hand member of extension spring (15) overlaps with the right-hand member of push rod (21) with the tie point of lever (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200574341U CN202442982U (en) | 2012-02-22 | 2012-02-22 | Metal wire expansion coefficient experiment instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200574341U CN202442982U (en) | 2012-02-22 | 2012-02-22 | Metal wire expansion coefficient experiment instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202442982U true CN202442982U (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200574341U Expired - Fee Related CN202442982U (en) | 2012-02-22 | 2012-02-22 | Metal wire expansion coefficient experiment instrument |
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| CN (1) | CN202442982U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048353A (en) * | 2012-12-12 | 2013-04-17 | 河西学院 | Measuring method for linear expansion coefficient of high-elastic-modulus metal wire material |
| CN103411838A (en) * | 2013-07-30 | 2013-11-27 | 内蒙古科技大学 | Method and device for measuring small elongation of solid material by using levers and Hall integrator |
| CN106556617A (en) * | 2016-10-19 | 2017-04-05 | 许昌学院 | Low-temperature concrete shrinkage test device |
| CN108152322A (en) * | 2017-11-10 | 2018-06-12 | 哈尔滨学院 | A kind of linear expansion coefficient tester based on Hall integrator |
| CN108614003A (en) * | 2018-05-10 | 2018-10-02 | 四川理工学院 | A kind of coefficient of thermal expansion measuring device based on Engineering Thermophysics |
| CN110231362A (en) * | 2019-05-30 | 2019-09-13 | 西安交通大学 | A method of tiny sample thermal expansion coefficient is tested using nanometer mechanics tester |
-
2012
- 2012-02-22 CN CN2012200574341U patent/CN202442982U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048353A (en) * | 2012-12-12 | 2013-04-17 | 河西学院 | Measuring method for linear expansion coefficient of high-elastic-modulus metal wire material |
| CN103048353B (en) * | 2012-12-12 | 2015-07-22 | 河西学院 | Measuring method for linear expansion coefficient of high-elastic-modulus metal wire material |
| CN103411838A (en) * | 2013-07-30 | 2013-11-27 | 内蒙古科技大学 | Method and device for measuring small elongation of solid material by using levers and Hall integrator |
| CN103411838B (en) * | 2013-07-30 | 2016-06-08 | 内蒙古科技大学 | Method and the device of solid material Chroococcus minutus is measured by lever and Hall integrator |
| CN106556617A (en) * | 2016-10-19 | 2017-04-05 | 许昌学院 | Low-temperature concrete shrinkage test device |
| CN106556617B (en) * | 2016-10-19 | 2018-11-20 | 许昌学院 | Low-temperature concrete shrinkage test device |
| CN108152322A (en) * | 2017-11-10 | 2018-06-12 | 哈尔滨学院 | A kind of linear expansion coefficient tester based on Hall integrator |
| CN108614003A (en) * | 2018-05-10 | 2018-10-02 | 四川理工学院 | A kind of coefficient of thermal expansion measuring device based on Engineering Thermophysics |
| CN108614003B (en) * | 2018-05-10 | 2021-03-23 | 四川理工学院 | Thermal expansion coefficient measuring device based on engineering thermophysics |
| CN110231362A (en) * | 2019-05-30 | 2019-09-13 | 西安交通大学 | A method of tiny sample thermal expansion coefficient is tested using nanometer mechanics tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120919 Termination date: 20130222 |