CN101672812B - Mechanism and method thereof for detecting clamping force of test piece in flat thermal conductivity coefficient measuring instrument - Google Patents

Mechanism and method thereof for detecting clamping force of test piece in flat thermal conductivity coefficient measuring instrument Download PDF

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Publication number
CN101672812B
CN101672812B CN2009100703434A CN200910070343A CN101672812B CN 101672812 B CN101672812 B CN 101672812B CN 2009100703434 A CN2009100703434 A CN 2009100703434A CN 200910070343 A CN200910070343 A CN 200910070343A CN 101672812 B CN101672812 B CN 101672812B
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clamping force
instrument
bung
test piece
thermal conductivity
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CN101672812A (en
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李艳宁
赵世迁
胡茂银
曾悠兵
谷凤春
邵克宁
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Tianjin University
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Tianjin University
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Abstract

The invention provides a mechanism for detecting clamping force of a test piece in a flat thermal conductivity coefficient measuring instrument, which comprises a mechanical part, a displacement detecting part and a pressure conversion part. A high-precision displacement sensor which can detect the micro-displacement of the instrument barrelhead is arranged on an instrument barrelhead, and the clamping force received by the test piece can be converted through detecting the output of the displacement sensor. The invention also provides a calibration method of the mechanism for detecting clamping force of the test piece in the flat thermal conductivity coefficient measuring instrument. The effect of the invention is achieved as follows: the clamping force received by the test piece can be calibrated in real time through a clamping force detecting mechanism and the calibration can be carried out on the clamping force detecting mechanism by utilizing a standardized pressure value, and the consistency of the clamping forces received by the test piece is ensured in repeated measurements, thereby improving the accuracy and the repetitiveness of the thermal conductivity coefficient measurement. The thermal conductivity coefficient instrument with the mechanism for detecting the clamping force of the test piece can be used widely in enterprises producing heat insulation materials, relevant quality inspection departments and units, scientific research institutions like universities and colleges, research institutions and the like.

Description

Clamping force of test piece in flat thermal conductivity coefficient measuring instrument testing agency and detection method thereof
Technical field
The present invention relates to a kind of detecting instrument, particularly a kind of clamping force of test piece in flat thermal conductivity coefficient measuring instrument testing agency and this mechanism and detection method thereof.
Background technology
The coefficient of heat conductivity of insulation material is to be used for weighing the thermal conduction characteristic of thermal insulation and insulation material and the important parameter of heat-insulating property in industrial circle, the building field, and this parameter is to detect by thermal conductivity measuring apparatus.Thermal conductivity measuring apparatus is a kind of important material property analytical instrument, and its ultimate principle is based on the coefficient of heat conductivity that Fourier's heat transfer theory is measured material, and the performance of thermal insulation and insulation material is determined by material thermal conductivity.Environment when the coefficient of heat conductivity of material depends on the composition, voidage, water absorptivity, water cut, inner structure of material and heat conduction and temperature etc. are all multifactor.Whether the accurate mensuration of coefficient of heat conductivity, for the exploitation of thermal insulation and insulation material with produce significant.Thermal conductivity measuring apparatus is the performance of thermal insulation and insulation material and the critical equipment of quality testing, be metering and quality supervised department to the calibrating of material, and R﹠D institution and manufacturer most important means that new material is developed.
In the mensuration of thermal insulation material steady state heat resistance and the related characteristics protection mainboard method (GB/T 10294-1988) clamping force of test specimen and plate has been made requirement: should be equipped with the device that can apply constant snap-in force, with the thermo-contact that improves test specimen and plate or between plate one of maintenance spacing accurately.When measuring thermal insulation material, applied pressure generally is not more than 2.5kPa.And existing domestic and international thermal conductivity measuring apparatus device, majority does not possess the pressure measurement function.Though some possesses the measurement function of pressure, energy measurement model suffered pressure in test process, what measuring mechanism adopted is pneumatic means, volume is too huge, realizes comparatively complicated.
Summary of the invention
For overcoming the deficiencies in the prior art, the purpose of this invention is to provide a kind of clamping force of test piece in flat thermal conductivity coefficient measuring instrument testing agency and detection method thereof, this mechanism's volume is little, and energy control survey model clamping force has very high measuring accuracy and repeatability.
For achieving the above object, the technical solution used in the present invention provides a kind of clamping force of test piece in flat thermal conductivity coefficient measuring instrument testing agency, this analyzer includes control part, have instrument master bucket, the instrument bung, backplate, mainboard, the test section of cold drawing reaches and the contacted cold drawing of instrument bung promotion part, wherein: on the substrate of described instrument bung, be provided with the clamping force measuring mechanism, the probe of described clamping force measuring mechanism bottom by self screen resilience be located at the instrument bung in the fixed beam of a side link to each other, described clamping force measuring mechanism is electrically connected with control part, promote cold drawing in the described instrument master bucket near mainboard with the contacted described cold drawing of instrument bung promotion part, form instrument bung substrate and fixed beam generation relative displacement, described clamping force measuring mechanism is sent into the relative displacement detection signal output of described generation the host computer of described control part.
The detection method of a kind of clamping force of test piece in flat thermal conductivity coefficient measuring instrument testing agency also is provided.
Effect of the present invention is can instant monitoring to be applied to clamping force on the test specimen by the clamping force measuring mechanism, thereby adjust clamping force immediately, can keep the constant power of stepping up to test specimen, make measurement result more accurate, improved the repeatability of thermal conductivity measurement greatly, this mechanism's volume is little simultaneously, realizes simple.The present invention can be widely used in manufacturing enterprise, correlated quality inspection department and the R﹠D institutions such as unit, institution of higher learning and research institute of insulation material.
Description of drawings
Fig. 1 measures the structural representation of clamping force for the clamping force measuring mechanism;
Fig. 2 utilizes high accuracy displacement sensor to measure the principle schematic of clamping force.
Among the figure:
1. instrument master bucket 2. backplates 3. mainboards 4. test specimens 5. cold drawings 6. fixed beams
7. instrument bung 8. nuts 9. cold drawing propulsive mechanisms 10. clamping force measuring mechanisms
Embodiment
Below in conjunction with drawings and Examples clamping force of test piece in flat thermal conductivity coefficient measuring instrument testing agency of the present invention and detection method thereof are further specified.
Clamping force of test piece in flat thermal conductivity coefficient measuring instrument of the present invention testing agency includes control part, have instrument master bucket 1, instrument bung 7, backplate 2, mainboard 3, the test section of cold drawing 5 reaches and the contacted cold drawing of instrument bung promotion part, on the substrate of described instrument bung 7, be provided with clamping force measuring mechanism 10, the probe of described clamping force measuring mechanism 10 bottoms links to each other with the fixed beam 6 that is located at instrument bung 7 interior sides by the screen resilience of self, described clamping force measuring mechanism 10 is electrically connected with control part, promote cold drawing in the described instrument master bucket near mainboard with instrument bung 7 contacted described cold drawing promotion parts, form instrument bung 7 substrates and fixed beam 6 generation relative displacements, described clamping force measuring mechanism 10 is sent into the relative displacement detection signal output of described generation the host computer of described control part.
Described clamping force measuring mechanism 10 includes protective cover, bent plate and high accuracy displacement sensor; Described bent plate is fixed on high accuracy displacement sensor on the substrate of instrument bung 7, can not collided with the safeguard bit displacement sensor.High accuracy displacement sensor is fixed on the instrument bung substrate, by probe, sensor outer housing with draw lead three parts and constitute.Probe can freely stretch, and the telescopic variation of probe can cause that the displacement transducer output signal changes.The free end of probe withstands on the fixed beam 6 by the screen resilience of self.Fixed beam 6 is fixed on the both sides of instrument bung 7, with instrument bung 7 be to be rigidly connected, can not change the position because of the deformation of instrument bung 7.Sensor outer housing is fixed on the bung substrate, follows the deformation of instrument bung 7 and the variation of occurrence positions.
Cold drawing propulsive mechanism 9 links to each other with nut by the screw thread contact, and nut is fixed on the instrument bung 7.When test specimen is measured, test specimen is put into instrument master bucket 1, instrument bung 7 closes.Rotation advances cold drawing propulsive mechanism 9, when test specimen with after the cold drawing propulsive mechanism contacts, cold drawing propulsive mechanism 9 no longer changes the position.Because the interaction of cold drawing propulsive mechanism 9 and nut, nut drives the bung substrate from the position 1, it is the initial position of substrate, represent with solid line among Fig. 1, when changing to position 2, dot among the figure, the enclosure location that is fixed on the displacement transducer on the bung substrate simultaneously changes, and the free end of popping one's head in this process withstands on the fixed beam 6 always, therefore variation has taken place in the relative position of shell and probe, promptly variation has taken place in Tan Tou stroke, thereby the output of clamping force measuring mechanism 10 changes.The output simulating signal of clamping force measuring mechanism 10 is sent in the capture card through drawing lead, capture card is that digital signal is sent in the host computer again with analog signal conversion, computer is analyzed signal, converts the suffered clamping force of test specimen to and is presented on the computer screen.The variation that monitors clamping force up to clamping force in the scope of GB regulation.When this test specimen is measured once more, when cold drawing propulsive mechanism 9 is advanced, monitor the output of clamping force measuring mechanism 10, and adjust clamping force according to the output of measuring mechanism 6, can guarantee like this when repeatedly measuring, test specimen to be kept constant clamping force.
Below in conjunction with Fig. 1 and Fig. 2 concrete principle and the detection method of clamping force measuring mechanism mensuration clamping force described:
The bung substrate is from the position 1 among Fig. 1, and promptly the initial position of substrate is represented with solid line, changes to position 2, dots.
Mainboard 3 and backplate 2 are considered as maintaining static, set instrument bung 7 when position 2, the pressure of the cold drawing that test specimen is subjected to is F '=P S, and S is the area that test specimen contacts with cold drawing here.The mainboard that is subjected at this moment of test specimen and backplate also are P to its total pressure as can be known, general pressure and F ' equal and opposite in direction, and direction is opposite.The acting force of the test specimen that cold drawing is subjected to is F, and with F ' equal and opposite in direction, direction is opposite.The cold drawing propulsive mechanism links to each other with instrument bung substrate by nut, and F makes the cold drawing propulsive mechanism promote nut and drive the instrument bung that make the bung substrate produce deformation, the variable quantity of establishing bung substrate center place is h, then has h = FL 3 48 EI , Wherein E is the elastic modulus of instrument bung, and I is an instrument bung substrate cross sectional moment of inertia, and L is the length of side of instrument bung substrate.Because sensor outer housing is fixed on the bung substrate, the distortion of instrument bung causes the enclosure location of displacement transducer that change has taken place, and the displacement of establishing relative initial position generation is d.Fixed beam is rigidly fixed on the instrument bung, and the distortion with the instrument bung does not change the position.Sensor probe withstands on the fixed beam all the time.The variable quantity of stroke of relative sensor outer housing of popping one's head in so promptly is d, as shown in Figure 2.Here the output variation delta U of displacement transducer and the displacement variable d of probe have linear relationship, promptly have constant K, make Δ U=Kd.The base plate deformation of instrument bung 7 is not linear, but certain radian is arranged, but the radian of hour base plate deformation is very little at h, can think linear approx.
If sensor is fixed on the x position, edge apart from instrument bung 7, so approximate has: d h = x L / 2 , d = 2 hx L , Wherein d is the displacement variable of probe, and h changes for the bung displacement substrate, and L is the length of side of instrument bung substrate, and x is the air line distance of the installation site of sensor to instrument bung edge.So have:
ΔU = K × d = K × 2 hx L = K × x 24 SL 2 EI × P = K ′ × P , Wherein K ′ = K · x 24 SL 2 EI , For the instrument that installs the clamping force measuring mechanism, K ' can think constant, can not change again, has so just obtained the relation of Δ U and P.
The thinking that detects is to remove to push test specimen with different clamping force F, and the suffered pressure of test specimen is P=F/S, the output variation delta U of Displacement Measurement sensor then, thus obtain the relation of P and Δ U.
Concrete detection method is as follows: can show that with electronic scales or other equipment replacement test specimen of pressure/pressure is placed on the position of test specimen, other parts of instrument remain unchanged;
U value U when 1, noting the suffered clamping force F=0 of test specimen 0
2, promote the cold drawing propulsive mechanism, cold drawing is parked in a certain position, read the force value that electronic scales shows, and this force value is converted to pressure values P 1, read the output valve U of displacement transducer at this moment 1, calculate Δ U 1=U 1-U 0
3, repeating step 2, write down a series of different (P i, Δ U i) value, Δ U here i=U i-U 0With P is the longitudinal axis, is transverse axis with Δ U, draws the curve of Δ U-P;
4, Δ U-P curve is carried out linear fit, obtain optimized Δ U-P linear relationship;
5, the Δ U-P straight line after will optimizing is made question blank or is simulated funtcional relationship, shape such as P=A * Δ U+B, and wherein A is the slope of the Δ U-P straight line after the match, B is the intercept of the Δ U-P straight line after the match.A, the constant that the numerical values recited of B is relevant with instrument, only relevant with the size of instrument bung and used material, clamping force measuring mechanism installation site x and used high accuracy displacement sensor, and irrelevant with clamping force.The relation of Δ U-P is write the software that is used in the computer converting and shows clamping force of test piece, when measuring clamping force later on, just can search or calculate corresponding P value according to the value of Δ U.
After placing test specimen, open instrument power source and external water bath with thermostatic control, its temperature is set at the required cold drawing temperature of test, open the required cold mainboard temperature of executive routine input test simultaneously, click begins test and carries out official test, and the test specimen coefficient of heat conductivity is measured.
The present embodiment experimental applications is as follows:
1, makes test specimen.
2, test specimen is placed:
(1) test specimen is put into instrument master bucket 1, built instrument bung 7 and locking.
(2) advance cold drawing propulsive mechanism 9 to make cold drawing 5 promote test specimen, the output of monitoring clamping force measuring mechanism 10, the size that cold drawing is contacted with test specimen guarantee clamping force simultaneously is within GB regulation 2.5kPa, note the pressure values of this moment, so that still adopt this pressure values when repeating this experiment later on, guarantee that the suffered clamping force of test specimen is identical.With placing second test specimen with quadrat method.Test specimen is placed and is finished, and prepares to begin test.
3, energized.
4, open water bath with thermostatic control, it is that cold drawing is provided with temperature that its output temperature is set.
5, open computing machine, enter the main interface of operation,, enter and measure the interface according to prompting.
Before formal the demarcation, carry out following work:
(1) with click " specimen thickness ", input actual (real) thickness value (mm);
(2) in " parameter is set " input cold drawing temperature;
(3) in " parameter is set " input mainboard temperature;
(4) " begin test " with click, enter automatic running status, finish behind the 180Min, provide the result.
The clamping force of test piece in flat thermal conductivity coefficient measuring instrument testing agency that the present invention uses has reached the purpose of implementing to measure the suffered clamping force of test specimen, has obviously improved the stated accuracy of plate heat conduction coefficient measuring instrument.

Claims (3)

1. clamping force of test piece in flat thermal conductivity coefficient measuring instrument testing agency, this analyzer includes control part, have instrument master bucket, the instrument bung, backplate, mainboard, the test section of cold drawing reaches and the contacted cold drawing of instrument bung promotion part, it is characterized in that: on the substrate of described instrument bung (7), be provided with clamping force measuring mechanism (10), the probe of described clamping force measuring mechanism (10) bottom links to each other with the fixed beam (6) that is located at the interior side of instrument bung (7) by the screen resilience of self, described clamping force measuring mechanism (10) is electrically connected with control part, promote the interior cold drawing of described instrument master bucket near mainboard with the contacted described cold drawing of instrument bung (7) promotion part, form instrument bung (7) substrate and fixed beam (6) relative displacement takes place, described clamping force measuring mechanism (10) is sent into the relative displacement detection signal output of described generation the host computer of described control part.
2. clamping force of test piece in flat thermal conductivity coefficient measuring instrument according to claim 1 testing agency, it is characterized in that: described clamping force measuring mechanism (10) includes protective cover, bent plate and high accuracy displacement sensor; Described bent plate is fixed on high accuracy displacement sensor on the substrate of instrument bung (7), can not collided with the safeguard bit displacement sensor.
3. the detection method of clamping force of test piece in flat thermal conductivity coefficient measuring instrument according to claim 1 testing agency, can show that with electronic scales or other equipment replacement test specimen of pressure/pressure is placed on the position of test specimen, other parts of instrument remain unchanged, and this method may further comprise the steps:
U value U when 1. at first noting the suffered clamping force F=0 of test specimen 0, the U value is the output valve of displacement transducer;
2. promote the cold drawing promotion part, cold drawing is parked in a certain position, read the force value that electronic scales shows, and this force value is converted to pressure values P 1, read the output valve U of displacement transducer at this moment 1, calculate Δ U 1=U 1-U 0
3. 2. repeating step writes down a plurality of different P i, Δ U iValue, Δ U here i=U i-U 0, draw the curve of Δ U-P;
4. Δ U-P curve is carried out linear fit, obtain optimized Δ U-P linear relationship;
5. the Δ U-P relation after will optimizing is made question blank or is simulated funtcional relationship, that is: P=A * Δ U+B;
Wherein A is the constant relevant with instrument with B, only relevant with the size of instrument bung and used material, clamping force measuring mechanism installation site x and used high accuracy displacement sensor, irrelevant with clamping force, the relation of Δ U-P write be used in the computer convert and show among the software of clamping force of test piece, when measuring clamping force later on, just can search or calculate corresponding P value according to the value of Δ U;
6. after placing test specimen, open instrument power source and external water bath with thermostatic control, its temperature is set at the required cold drawing temperature of test, open the required cold mainboard temperature of executive routine input test simultaneously, click begins test and carries out official test, and the test specimen coefficient of heat conductivity is demarcated.
CN2009100703434A 2009-09-03 2009-09-03 Mechanism and method thereof for detecting clamping force of test piece in flat thermal conductivity coefficient measuring instrument Expired - Fee Related CN101672812B (en)

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Denomination of invention: Mechanism and method thereof for detecting clamping force of test piece in flat thermal conductivity coefficient measuring instrument

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