CN110618021A - Performance test platform for insulation board - Google Patents
Performance test platform for insulation board Download PDFInfo
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- CN110618021A CN110618021A CN201910718076.0A CN201910718076A CN110618021A CN 110618021 A CN110618021 A CN 110618021A CN 201910718076 A CN201910718076 A CN 201910718076A CN 110618021 A CN110618021 A CN 110618021A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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Abstract
The invention provides a heat insulation plate performance test platform, wherein a test object is a concrete sandwich heat insulation plate, and the heat insulation performance of the concrete sandwich heat insulation plate and the shear resistance limit bearing capacity of the inclined section of the concrete sandwich heat insulation plate are tested by utilizing a temperature sensor, a signal processing circuit, a shear resistance bearing capacity test module, a central processing unit, a display device and a storage device, wherein the heat insulation performance of the concrete sandwich heat insulation plate can be accurately tested by utilizing the temperature sensor and the signal processing circuit, a simplified shear diagram of the section of the concrete sandwich heat insulation plate is constructed by utilizing the shear resistance bearing capacity test module, and the shear resistance limit bearing capacity of the inclined section of the concrete sandwich heat insulation plate is further conveniently and quickly calculated.
Description
Technical Field
The invention relates to the field of building energy-saving insulation boards, in particular to a performance test platform for an insulation board.
Background
Although a developing large country in China is the country with the most population all over the world, the energy resources per capita are quite scarce. In addition, China is also a big building country. At present, the building area of the urban and rural areas in China is about 400 hundred million meters2The area of newly-increased urban and rural houses reaches 17-18 hundred million m each year2The new construction scale is larger than the sum of the annual completed construction areas of all developed countries in the westMore is needed. It is conceivable that if these new houses are designed without the standard and specification of camera joint energy, this not only causes a great waste of energy, but also is very disadvantageous to the recycling of resources. Building energy conservation is an important measure for implementing social and economic sustainable development in the construction field, and the importance of building development in China is embodied in the following three aspects.
(1) The energy conservation of the building can play a great role in alleviating the tension of energy supply. China is a country with large energy consumption, and the total energy consumption per year is second to that of the United states. But it is not optimistic that the rate of increase of energy production in China lags behind the rate of increase of national economy. With the gradual improvement of living standard, the construction industry of China is rapidly developed, and the speed of building energy consumption caused by the development is also astonishing. The building energy consumption generally includes heating, refrigeration, lighting, cooking and various electrical appliances and mechanical equipment. Wherein the energy consumption occupied by heating and refrigeration accounts for about 60-70% of the total energy consumption. 400 hundred million m existed in China2The building with the energy-saving technology only accounts for 1 percent of the building, and the energy consumption of the heating of the unit area of the existing building in China is about 2 to 3 times of that of certain developed countries in the western world. The building envelope mainly aims to improve the heat preservation and insulation effect of the building envelope in China, so that the heating energy consumption is 2/3 of the total energy consumption. The total energy consumption of the building field is about 30% of the total energy consumption of China, and the proportion is gradually close to 30% -40%, so that the energy supply is more tense. The energy conservation of the prisoner's building is a gospel without being different from the tense situation of energy supply.
(2) Building energy conservation also has a great positive effect on maintaining the quality of the atmosphere. The energy structure of China is mainly coal, and the air pollution caused by the large consumption of the coal is more severe. SO discharged by fire coal every year in China2About 60 ten thousand tons and about 26 ten thousand tons of smoke dust, and the atmospheric pollution index generally exceeds the national standard in winter. For example, compared with the heating period and the non-heating period in the fertilizer combining area, the dust is 1.2 times higher, the nitrogen oxide and CO are 1.5 times higher, and the SO is21.4 times higher. These substances are not only harmful to human health, but also cause acid rain, and soil, forestForest, field, etc. cause great damage. In addition, the coal combustion in China also causes greenhouse gas CO every year2Is discharged in large quantities, of about 2.6 million tons. CO 22The emission is the second place in the world, and accounts for 13% of the total emission.
(3) The building energy conservation also has great promotion effect on improving the living standard of people. The wide breadth of our country and the large latitude span cause the great temperature difference between north and south in winter. The winter climate in the northeast region is extremely cold, and the duration of severe cold days is also long. In contrast, in the north China area, the winter time is not as long, although the winter time is not as cold as in the northeast area. But summer hot weather lasts longer. The heat preservation and heat insulation performance of the buildings in China is not enough in the past, and the energy saving level is laggard behind and is only equivalent to the level of six and seven years in developed countries in the West. Although the energy-saving work of buildings in China is relatively laggard, the potential is huge. After the schedule of building energy-saving technology in China is improved, the newly built energy-saving building is used for heating, the intelligent consumption is greatly improved, and the heat preservation and heat insulation performance of the building enclosure is also enhanced. The measure effectively improves the indoor thermal environment and improves the living quality and the living comfort of people.
But current intelligent degree to heated board capability test is not high, and is first, can't simplify and effective computational analysis to heated board shear resistance bearing capacity, and the second can't carry out high accuracy monitoring to the heat preservation performance of heated board.
Disclosure of Invention
Therefore, in order to overcome the problems, the invention provides a test platform for the performance of a heat insulation board, a test object is a concrete sandwich heat insulation board, and the heat insulation performance of the concrete sandwich heat insulation board and the oblique section shear resistance limit bearing capacity of the concrete sandwich heat insulation board are tested by using a temperature sensor, a signal processing circuit, a shear resistance bearing capacity test module, a central processing unit, a display device and a storage device, wherein the heat insulation performance of the concrete sandwich heat insulation board can be accurately tested by using the temperature sensor and the signal processing circuit, a simplified diagram of the shear resistance of the cross section of the concrete sandwich heat insulation board is constructed by using the shear resistance bearing capacity test module, and then the oblique section shear resistance limit bearing capacity of the concrete sandwich heat insulation board is conveniently and quickly calculated.
The invention discloses a performance test platform for an insulation board, which comprises a temperature sensor, a signal processing circuit, an anti-shearing bearing capacity test module, a central processing device, a display device and a storage device, wherein the insulation board is a concrete sandwich insulation board.
The output end of the temperature sensor is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the central processing device, the output end of the anti-shearing bearing capacity testing module is connected with the input end of the central processing device, the input end of the display device is connected with the output end of the central processing device, and the input end of the storage device is connected with the output end of the central processing device.
The temperature sensor is arranged in the closed space formed by the heat insulation plates, the closed space formed by the heat insulation plates is arranged in the thermostatic chamber, the temperature sensor is used for collecting temperature signals in the closed space, the temperature sensor transmits the collected temperature signals to the signal processing circuit, the signal processing circuit carries out signal processing on the received temperature signals and then transmits the processed temperature signals to the central processing device, the anti-shearing bearing capacity testing module analyzes and calculates the anti-shearing limit bearing capacity of the inclined section of the concrete sandwich heat insulation plate and transmits the calculated anti-shearing limit bearing capacity of the inclined section of the concrete sandwich heat insulation plate to the central processing device, the central processing device converts the received temperature signals into temperature values and then transmits the temperature values to the display device for displaying, and the central processing device transmits the received anti-shearing limit bearing capacity of the inclined section of the concrete sandwich heat insulation plate to the display device for displaying, the central processing device converts the received temperature signals into temperature values and then transmits the temperature values to the storage device for storage, and the central processing device transmits the received oblique section shear resistance limit bearing capacity of the concrete sandwich insulation board to the storage device for storage.
Preferably, the shear resistance bearing capacity test module analyzes and calculates the shear resistance limit bearing capacity of the inclined section of the concrete sandwich insulation board, and the internal moment of any section of the constructed insulation board isFrom the moment balance, a balance differential equation can be established:
；
order toThen, there is,；
to pairObtaining by solution:；
here, let z =0 and y =0 at z = l,
then, there is, B =0,(ii) a Under small perturbation, A is not equal to 0,
then there is a change in the number of,，；
if n =1, then there is,(ii) a The cut-in modulus is introduced thereinWherein, in the step (A),；
then there is a change in the number of,；
according to the formula, the oblique section shear resistance limit bearing capacity V suitable for the concrete sandwich insulation board is obtainedu，
Wherein the content of the first and second substances,；
x, y and z respectively represent length parameters of the heat-insulating plate in the x-axis direction, the y-axis direction and the z-axis direction, N represents the buckling bearing capacity of the transverse pressed oblique-insertion steel bars on the oblique section of the heat-insulating plate, A and B represent the amplitude parameter of the shearing resistance bearing capacity, l represents the length of the pressed oblique-insertion steel bars between the upper leaf concrete layer and the lower leaf concrete layer, N represents the number of the pressed oblique-insertion steel bars on the oblique section of the heat-insulating plate, and N represents the number of the pressedcrIs the critical force when the pressed oblique inserted steel bar is elastically bent and bent,denotes the tangent modulus coefficient, EtThe tangent modulus of the pressed oblique-insertion steel bar is shown, E represents the elastic modulus of the pressed oblique-insertion steel bar,and the correlation coefficient is represented, I represents the section inertia moment of the stressed obliquely-inserted steel bar, alpha represents the included angle between the stressed obliquely-inserted steel bar and the ordinate, and mu represents the calculated length coefficient.
Preferably, the temperature sensor is arranged in a closed space formed by the heat insulation plates, the closed space formed by the heat insulation plates is placed in the thermostatic chamber, the temperature sensor is used for collecting temperature signals in the closed space, the temperature sensor transmits the collected temperature signals to the signal processing circuit, and the signal processing circuit sequentially amplifies and filters the received temperature signals and transmits the temperature signals to the central processing unit.
Preferably, the temperature sensor is configured to collect a temperature signal in the enclosed space, convert the collected temperature signal into a voltage signal V0, and transmit the voltage signal V0 to the signal processing circuit, V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit includes a signal amplification unit and a signal filtering unit, an output end of the temperature sensor is connected to an input end of the signal amplification unit, an output end of the signal amplification unit is connected to an input end of the signal filtering unit, and an output end of the signal filtering unit is connected to an input end of the central processing unit.
Preferably, the signal amplifying unit includes an integrated operational amplifier A1-A4, a capacitor C1 and resistors R1-R11.
Wherein, the output end of the temperature sensor is connected with the non-inverting input end of the integrated operational amplifier A1, one end of the resistor R1 is grounded, the other end of the resistor R1 is connected with the non-inverting input end of the integrated operational amplifier A1, one end of the resistor R3 is grounded, the other end of the resistor R3 is also connected with the inverting input end of the integrated operational amplifier A1, the other end of the resistor R3 is also connected with one end of the resistor R2, the other end of the resistor R2 is connected with the output end of the integrated operational amplifier A1, the other end of the resistor R2 is also connected with the non-inverting input end of the integrated operational amplifier A2, one end of the resistor R5 is grounded, the other end of the resistor R5 is also connected with the inverting input end of the integrated operational amplifier A2, the other end of the resistor R R6959 is also connected with one end of the resistor R4, the other end of the resistor R4 is connected with the output end of the integrated operational amplifier A2, the other end of the resistor R4 is also connected with the non-inverting input end of, the other end of the resistor R7 is further connected with one end of a resistor R6, the other end of the resistor R6 is connected with an output end of the integrated operational amplifier A3, the other end of the resistor R6 is connected with one end of a capacitor C1, one end of the resistor R8 is grounded, the other end of the resistor R8 is connected with the other end of a capacitor C1, the other end of the resistor R8 is further connected with a non-inverting input end of the integrated operational amplifier A4, one end of the resistor R10 is grounded, the other end of the resistor R10 is further connected with an inverting input end of the integrated operational amplifier A4, the other end of the resistor R10 is further connected with one end of a resistor R9, the other end of the resistor R9 is connected with an output end of the integrated operational amplifier A4, the other end of the resistor R9 is further connected with one end of a resistor R46.
Preferably, the signal filtering unit comprises resistors R12-R16, capacitors C2-C4 and an integrated operational amplifier A5-A6.
Wherein, the output end of the signal amplifying unit is connected with one end of a resistor R12, the output end of the signal amplifying unit is further connected with one end of a capacitor C3, the output end of a resistor R12 is connected with the input end of a resistor R13, the other end of a capacitor C3 is connected with one end of a capacitor C4, the other end of a resistor C3 is further connected with one end of a resistor R14, the other end of a resistor R14 is connected with one end of a capacitor C2, the other end of a capacitor C2 is connected with one end of a resistor R13, one end of a capacitor C4 is connected with one end of a capacitor R14, the other end of a resistor R14 is connected with the inverting input end of an integrated operational amplifier A6, the output end of an integrated operational amplifier A6 is connected with one end of a capacitor C2, the other end of a resistor R13 is connected with the non-inverting input end of an integrated operational amplifier A5, the inverting input end of an integrated operational amplifier A5 is connected with the output end of an integrated operational amplifier A86, the other end of the resistor R16 is connected with the non-inverting input end of the integrated operational amplifier A6, the other end of the resistor R16 is also connected with one end of the resistor R15, the other end of the resistor R15 is connected with the output end of the integrated operational amplifier A5, the output end of the integrated operational amplifier A5 is connected with the input end of the central processing device, and the signal filtering unit transmits a voltage signal V1 to the ADC port of the central processing device.
Preferably, the central processing unit is an ARM processing chip.
Preferably, the display device is an LCD display.
Preferably, the storage device further comprises a data reading interface.
Preferably, the temperature sensor is a thermistor.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the performance test platform for the insulation board, provided by the invention, a test object is a concrete sandwich insulation board, and the insulation performance of the concrete sandwich insulation board and the shear resistance limit bearing capacity of the inclined section of the concrete sandwich insulation board are tested by utilizing the temperature sensor, the signal processing circuit, the shear resistance bearing capacity test module, the central processing unit, the display device and the storage device, wherein the insulation performance of the concrete sandwich insulation board can be accurately tested by utilizing the temperature sensor and the signal processing circuit, the shear resistance bearing capacity test module is used for constructing a simplified shear diagram of the section of the concrete sandwich insulation board, and the shear resistance limit bearing capacity of the inclined section of the concrete sandwich insulation board is further conveniently and quickly calculated.
(2) The invention also provides a heat insulation board performance test platform, which is characterized in that signals acquired by the temperature sensor are weak voltage signals, so that the voltage signal V0 output by the temperature sensor is amplified by the signal amplification unit through the integrated operational amplifier A1-A4, the capacitor C1 and the resistor R1-R11, and the signal amplification unit formed by the integrated operational amplifier A1-A4, the capacitor C1 and the resistor R1-R11 only has drift of 2.75 muV/DEG C, offset within 2 muV, 100pA bias current and noise of 1.35nV within a 0.1Hz to 10Hz broadband. The signal filtering unit uses resistors R12-R16, capacitors C2-C4 and an integrated operational amplifier A5-A6 to filter the amplified electric signals, so that the temperature detection precision is improved.
Drawings
Fig. 1 is a schematic diagram of a performance test platform of the insulation board of the present invention.
FIG. 2 is a schematic diagram of the oblique cross section of the insulation board of the present invention being sheared;
FIG. 3 is a time-dependent temperature change relationship in a closed space formed by insulation boards according to the present invention;
fig. 4 is a circuit diagram of the signal processing circuit of the present invention.
Detailed Description
The following describes the performance test platform of the insulation board in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the thermal insulation board performance test platform provided by the invention comprises a temperature sensor, a signal processing circuit, a shear resistance bearing capacity test module, a central processing device, a display device and a storage device, wherein the thermal insulation board is a concrete sandwich thermal insulation board.
The output end of the temperature sensor is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the central processing device, the output end of the anti-shearing bearing capacity testing module is connected with the input end of the central processing device, the input end of the display device is connected with the output end of the central processing device, and the input end of the storage device is connected with the output end of the central processing device.
The temperature sensor is arranged in the closed space formed by the heat insulation plates, the closed space formed by the heat insulation plates is arranged in the thermostatic chamber, the temperature sensor is used for collecting temperature signals in the closed space, the temperature sensor transmits the collected temperature signals to the signal processing circuit, the signal processing circuit carries out signal processing on the received temperature signals and then transmits the processed temperature signals to the central processing device, the anti-shearing bearing capacity testing module analyzes and calculates the anti-shearing limit bearing capacity of the inclined section of the concrete sandwich heat insulation plate and transmits the calculated anti-shearing limit bearing capacity of the inclined section of the concrete sandwich heat insulation plate to the central processing device, the central processing device converts the received temperature signals into temperature values and then transmits the temperature values to the display device for displaying, and the central processing device transmits the received anti-shearing limit bearing capacity of the inclined section of the concrete sandwich heat insulation plate to the display device for displaying, the central processing device converts the received temperature signals into temperature values and then transmits the temperature values to the storage device for storage, and the central processing device transmits the received oblique section shear resistance limit bearing capacity of the concrete sandwich insulation board to the storage device for storage.
In the above embodiment, the test object is a concrete sandwich insulation board, utilize temperature sensor, signal processing circuit, anti-shear bearing capacity test module, central processing unit, display device and storage device test the thermal insulation performance of concrete sandwich insulation board and the oblique section anti-shear limit bearing capacity of concrete sandwich insulation board, wherein, the thermal insulation performance of concrete sandwich insulation board can be accurately tested using temperature sensor and signal processing circuit, use anti-shear bearing capacity test module to construct concrete sandwich insulation board cross-section and receive the shear simplified diagram, and then convenient and fast's the oblique section anti-shear limit bearing capacity of concrete sandwich insulation board of calculating.
The staff can directly acquire the temperature information of the closed space formed by the insulation boards through the display device, the central processing device draws the received temperature information into a temperature-time change trend, as shown in fig. 3, the closed space formed by the insulation boards is arranged in a thermostatic chamber at 25 ℃, the temperature in the closed space is also 25 ℃ at the beginning, the temperature change of the closed space formed by the insulation boards can be directly reflected through the temperature-time change trend graph, and the staff can also acquire the oblique section shearing resistance limit bearing capacity of the concrete sandwich insulation board through the display device.
The storage device stores a temperature-time change trend graph corresponding to the model of the insulation board and the shear resistance limit bearing capacity of the inclined section of the concrete sandwich insulation board, so that a worker can conveniently obtain historical data.
As shown in fig. 2, fig. 2 is a schematic diagram of the oblique section of the insulation board being cut, wherein V iscThe shear force of the upper and lower leaf concrete is applied, and Vs is the pin bolt shear force applied by the longitudinal stressed steel bar in the concrete layer.
According to the schematic diagram of the oblique section shearing of the heat-insulating plate shown in fig. 2, the shear resistance bearing capacity test module analyzes and calculates the shear resistance limit bearing capacity of the oblique section of the concrete sandwich heat-insulating plate, and under the condition of small disturbance, the internal moment of any section of the heat-insulating plate isFrom the moment balance, a balance differential equation can be established:
；
order toThen, there is,；
to pairObtaining by solution:；
here, let z =0 and y =0 at z = l,
then, there is, B =0,(ii) a Under small perturbation, A is not equal to 0,
then there is a change in the number of,，；
if n =1, then there is,(ii) a The cut-in modulus is introduced thereinWherein, in the step (A),；
then there is a change in the number of,；
according to the formula, the oblique section shear resistance limit bearing capacity V suitable for the concrete sandwich insulation board is obtainedu，
Wherein the content of the first and second substances,；
x, y and z respectively represent length parameters of the heat-insulating plate in the x-axis direction, the y-axis direction and the z-axis direction, N represents the buckling bearing capacity of the transverse pressed oblique-insertion steel bars on the oblique section of the heat-insulating plate, A and B represent the amplitude parameter of the shearing resistance bearing capacity, l represents the length of the pressed oblique-insertion steel bars between the upper leaf concrete layer and the lower leaf concrete layer, N represents the number of the pressed oblique-insertion steel bars on the oblique section of the heat-insulating plate, and N represents the number of the pressedcrIs the critical force when the pressed oblique inserted steel bar is elastically bent and bent,denotes the tangent modulus coefficient, EtThe tangent modulus of the pressed oblique-insertion steel bar is shown, E represents the elastic modulus of the pressed oblique-insertion steel bar,and the correlation coefficient is represented, I represents the section inertia moment of the stressed obliquely-inserted steel bar, alpha represents the included angle between the stressed obliquely-inserted steel bar and the ordinate, and mu represents the calculated length coefficient.
Specifically, the temperature sensor is arranged in a closed space formed by the heat insulation plates, the closed space formed by the heat insulation plates is placed in the thermostatic chamber, the temperature sensor is used for collecting temperature signals in the closed space, the temperature sensor transmits the collected temperature signals to the signal processing circuit, and the signal processing circuit sequentially amplifies and filters the received temperature signals and then transmits the temperature signals to the central processing device.
As shown in fig. 4, the temperature sensor is configured to collect a temperature signal in the enclosed space, convert the collected temperature signal into a voltage signal V0, and transmit the voltage signal V0 to the signal processing circuit, V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit includes a signal amplification unit and a signal filtering unit, an output end of the temperature sensor is connected to an input end of the signal amplification unit, an output end of the signal amplification unit is connected to an input end of the signal filtering unit, and an output end of the signal filtering unit is connected to an input end of the central processing unit.
Specifically, the signal amplification unit comprises integrated operational amplifiers A1-A4, a capacitor C1 and resistors R1-R11.
Wherein, the output end of the temperature sensor is connected with the non-inverting input end of the integrated operational amplifier A1, one end of the resistor R1 is grounded, the other end of the resistor R1 is connected with the non-inverting input end of the integrated operational amplifier A1, one end of the resistor R3 is grounded, the other end of the resistor R3 is also connected with the inverting input end of the integrated operational amplifier A1, the other end of the resistor R3 is also connected with one end of the resistor R2, the other end of the resistor R2 is connected with the output end of the integrated operational amplifier A1, the other end of the resistor R2 is also connected with the non-inverting input end of the integrated operational amplifier A2, one end of the resistor R5 is grounded, the other end of the resistor R5 is also connected with the inverting input end of the integrated operational amplifier A2, the other end of the resistor R R6959 is also connected with one end of the resistor R4, the other end of the resistor R4 is connected with the output end of the integrated operational amplifier A2, the other end of the resistor R4 is also connected with the non-inverting input end of, the other end of the resistor R7 is further connected with one end of a resistor R6, the other end of the resistor R6 is connected with an output end of the integrated operational amplifier A3, the other end of the resistor R6 is connected with one end of a capacitor C1, one end of the resistor R8 is grounded, the other end of the resistor R8 is connected with the other end of a capacitor C1, the other end of the resistor R8 is further connected with a non-inverting input end of the integrated operational amplifier A4, one end of the resistor R10 is grounded, the other end of the resistor R10 is further connected with an inverting input end of the integrated operational amplifier A4, the other end of the resistor R10 is further connected with one end of a resistor R9, the other end of the resistor R9 is connected with an output end of the integrated operational amplifier A4, the other end of the resistor R9 is further connected with one end of a resistor R46.
Specifically, the signal filtering unit comprises resistors R12-R16, capacitors C2-C4 and an integrated operational amplifier A5-A6.
Wherein, the output end of the signal amplifying unit is connected with one end of a resistor R12, the output end of the signal amplifying unit is further connected with one end of a capacitor C3, the output end of a resistor R12 is connected with the input end of a resistor R13, the other end of a capacitor C3 is connected with one end of a capacitor C4, the other end of a resistor C3 is further connected with one end of a resistor R14, the other end of a resistor R14 is connected with one end of a capacitor C2, the other end of a capacitor C2 is connected with one end of a resistor R13, one end of a capacitor C4 is connected with one end of a capacitor R14, the other end of a resistor R14 is connected with the inverting input end of an integrated operational amplifier A6, the output end of an integrated operational amplifier A6 is connected with one end of a capacitor C2, the other end of a resistor R13 is connected with the non-inverting input end of an integrated operational amplifier A5, the inverting input end of an integrated operational amplifier A5 is connected with the output end of an integrated operational amplifier A86, the other end of the resistor R16 is connected with the non-inverting input end of the integrated operational amplifier A6, the other end of the resistor R16 is also connected with one end of the resistor R15, the other end of the resistor R15 is connected with the output end of the integrated operational amplifier A5, the output end of the integrated operational amplifier A5 is connected with the input end of the central processing device, and the signal filtering unit transmits a voltage signal V1 to the ADC port of the central processing device.
In the above embodiment, the noise of the signal processing circuit is within 1.35nV, the drift is 2.75 μ V/deg.c, the types of the integrated operational amplifiers a1-a4 are all LT1223, and the types of the integrated operational amplifiers a5-a6 are all LT 1192.
In the signal amplifying unit, the resistance of the resistor R1 is 50 Ω, the resistance of the resistor R2 is 1k Ω, the resistance of the resistor R3 is 365 Ω, the resistance of the resistor R4 is 1k Ω, the resistance of the resistor R5 is 365 Ω, the resistance of the resistor R6 is 1k Ω, the resistance of the resistor R7 is 365 Ω, the resistance of the resistor R8 is 1k Ω, the resistance of the resistor R9 is 1k Ω, the resistance of the resistor R10 is 365 Ω, the resistance of the resistor R11 is 50 Ω, and the capacitance of the capacitor C1 is 1 μ F.
The signal amplification unit in this embodiment is a 40MHz amplifier, and has a fast response speed to the voltage signal output by the sensor. The signal amplification unit can effectively amplify the signals collected by the sensor, and the amplified signals are smooth and undistorted.
In the signal filtering unit, the resistance values of the resistors R12-R16 and the capacitance values of the capacitors C2-C4 are set according to the filtering requirement.
In the embodiment, the resistance values of the resistors R12-R16 and the capacitance values of the capacitors C2-C4 are preferably set, wherein the resistor R12= R13=2R14= R, and the capacitor C3= C4= C2/2= C.
The filter frequency isAnd the filtering quality parameter is Q.
Wherein the content of the first and second substances,
；
；
in the above embodiment, the center frequency f0=60Hz。
The signal collected by the temperature sensor is a weak voltage signal, so that the signal amplification unit amplifies a voltage signal V0 output by the temperature sensor through the integrated operational amplifier A1-A4, the capacitor C1 and the resistors R1-R11, and the signal amplification unit formed by the integrated operational amplifier A1-A4, the capacitor C1 and the resistors R1-R11 has drift of only 2.75 muV/DEG C, offset within 2 muV, bias current of 100pA and noise of 1.35nV within a broadband from 0.1Hz to 10 Hz. The signal filtering unit uses resistors R12-R16, capacitors C2-C4 and an integrated operational amplifier A5-A6 to filter the amplified electric signals, so that the temperature detection precision is improved.
Specifically, the central processing unit is an ARM processing chip.
In particular, the display device is an LCD display.
Specifically, the storage device further comprises a data reading interface, and the staff can acquire the historical data stored in the storage device through the data reading interface.
Specifically, the temperature sensor is a thermistor, the diameter of the thermistor is very small and reaches 1mm or less, so that the thermal time constant is only 1s, and the thermal time constants of the thermistors are generally 10s or more, so that the temperature sensor used in the invention realizes high-speed response of 10 times or more.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A performance test platform for a heat-insulation plate is characterized by comprising a temperature sensor, a signal processing circuit, a shear-resistant bearing capacity test module, a central processing unit, a display device and a storage device, wherein the heat-insulation plate is a concrete sandwich heat-insulation plate;
the output end of the temperature sensor is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the central processing device, the output end of the anti-shearing bearing capacity testing module is connected with the input end of the central processing device, the input end of the display device is connected with the output end of the central processing device, and the input end of the storage device is connected with the output end of the central processing device;
the temperature sensor is arranged in the closed space formed by the heat insulation plates, the closed space formed by the heat insulation plates is placed in a thermostatic chamber, the temperature sensor is used for collecting temperature signals in the closed space, the temperature sensor transmits the collected temperature signals to the signal processing circuit, the signal processing circuit performs signal processing on the received temperature signals and transmits the processed temperature signals to the central processing device, the anti-shearing bearing capacity testing module analyzes and calculates the oblique section anti-shearing limit bearing capacity of the concrete sandwich heat insulation plates, the calculated oblique section anti-shearing limit bearing capacity of the concrete sandwich heat insulation plates is transmitted to the central processing device, the central processing device converts the received temperature signals into temperature values and transmits the temperature values to the display device for display, and the central processing device transmits the received oblique section anti-shearing limit bearing capacity of the concrete sandwich heat insulation plates to the display device for display The device displays the temperature signals, the central processing device converts the received temperature signals into temperature values and transmits the temperature values to the storage device for storage, and the central processing device transmits the received oblique section shear resistance limit bearing capacity of the concrete sandwich insulation board to the storage device for storage.
2. The insulation board performance test platform according to claim 1, wherein the shear resistance bearing capacity test module analyzes and calculates the shear resistance limit bearing capacity of the inclined section of the concrete sandwich insulation board, and under a small disturbance degree, the internal moment of any section of the insulation board is constructed asFrom the moment balance, a balance differential equation can be established:
；
order toThen, there is,；
to pairObtaining by solution:；
here, let z =0 and y =0 at z = l,
then, there is, B =0,(ii) a Under small perturbation, A is not equal to 0,
then there is a change in the number of,，；
if n =1, then there is,(ii) a The cut-in modulus is introduced thereinWherein, in the step (A),；
then there is a change in the number of,；
according to the formula, the oblique section shear resistance limit bearing capacity V suitable for the concrete sandwich insulation board is obtainedu，
Wherein the content of the first and second substances,；
x, y and z respectively represent length parameters of the heat-insulating plate in the x-axis direction, the y-axis direction and the z-axis direction, N represents the buckling bearing capacity of the transverse pressed oblique-insertion steel bars on the oblique section of the heat-insulating plate, A and B represent the amplitude parameter of the shearing resistance bearing capacity, l represents the length of the pressed oblique-insertion steel bars between the upper leaf concrete layer and the lower leaf concrete layer, N represents the number of the pressed oblique-insertion steel bars on the oblique section of the heat-insulating plate, and N represents the number of the pressedcrIs the critical force when the pressed oblique inserted steel bar is elastically bent and bent,denotes the tangent modulus coefficient, EtThe tangent modulus of the pressed oblique-insertion steel bar is shown, E represents the elastic modulus of the pressed oblique-insertion steel bar,and the correlation coefficient is represented, I represents the section inertia moment of the stressed obliquely-inserted steel bar, alpha represents the included angle between the stressed obliquely-inserted steel bar and the ordinate, and mu represents the calculated length coefficient.
3. The insulation board performance test platform according to claim 1, wherein the temperature sensor is disposed in a closed space formed by the insulation boards, the closed space formed by the insulation boards is placed in a thermostatic chamber, the temperature sensor is used for collecting temperature signals in the closed space, the temperature sensor transmits the collected temperature signals to the signal processing circuit, and the signal processing circuit sequentially performs signal amplification and signal filtering on the received temperature signals and then transmits the temperature signals to the central processing unit.
4. The insulation board performance test platform according to claim 1 or 3, wherein the temperature sensor is configured to collect a temperature signal in the enclosed space, convert the collected temperature signal into a voltage signal V0, and transmit the voltage signal V0 to the signal processing circuit, V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit includes a signal amplification unit and a signal filtering unit, an output end of the temperature sensor is connected to an input end of the signal amplification unit, an output end of the signal amplification unit is connected to an input end of the signal filtering unit, and an output end of the signal filtering unit is connected to an input end of the central processing unit.
5. The platform for testing the performance of the heat-insulation board according to claim 4, wherein the signal amplification unit comprises integrated operational amplifiers A1-A4, a capacitor C1 and resistors R1-R11;
wherein, the output end of the temperature sensor is connected with the non-inverting input end of the integrated operational amplifier a1, one end of the resistor R1 is grounded, the other end of the resistor R1 is connected with the non-inverting input end of the integrated operational amplifier a1, one end of the resistor R3 is grounded, the other end of the resistor R3 is also connected with the inverting input end of the integrated operational amplifier a1, the other end of the resistor R3 is also connected with one end of the resistor R2, the other end of the resistor R2 is connected with the output end of the integrated operational amplifier a1, the other end of the resistor R2 is also connected with the non-inverting input end of the integrated operational amplifier a2, one end of the resistor R5 is grounded, the other end of the resistor R5 is also connected with the inverting input end of the integrated operational amplifier a2, the other end of the resistor R6959 is also connected with one end of the resistor R4, the other end of the resistor R4 is connected with the output end of the integrated operational amplifier a2, the other end of the resistor R4 is also connected with the non-inverting input end of the integrated, the other end of the resistor R7 is further connected with one end of a resistor R6, the other end of the resistor R6 is connected with an output end of the integrated operational amplifier A3, the other end of the resistor R6 is connected with one end of a capacitor C1, one end of the resistor R8 is grounded, the other end of the resistor R8 is connected with the other end of a capacitor C1, the other end of the resistor R8 is further connected with a non-inverting input end of the integrated operational amplifier A4, one end of the resistor R10 is grounded, the other end of the resistor R10 is further connected with an inverting input end of the integrated operational amplifier A4, the other end of the resistor R10 is further connected with one end of a resistor R9, the other end of the resistor R9 is connected with an output end of the integrated operational amplifier A4, the other end of the resistor R9 is further connected with one end of a resistor R11.
6. The insulation board performance test platform of claim 5, wherein the signal filtering unit comprises resistors R12-R16, capacitors C2-C4 and an integrated operational amplifier A5-A6;
wherein, the output end of the signal amplifying unit is connected with one end of a resistor R12, the output end of the signal amplifying unit is further connected with one end of a capacitor C3, the output end of a resistor R12 is connected with the input end of a resistor R13, the other end of a capacitor C3 is connected with one end of a capacitor C4, the other end of a resistor C3 is further connected with one end of a resistor R14, the other end of a resistor R14 is connected with one end of a capacitor C2, the other end of a capacitor C2 is connected with one end of a resistor R13, one end of a capacitor C4 is connected with one end of a capacitor R14, the other end of a resistor R14 is connected with the inverting input end of an integrated operational amplifier A6, the output end of an integrated operational amplifier A6 is connected with one end of a capacitor C2, the other end of a resistor R13 is connected with the non-inverting input end of an integrated operational amplifier A5, the inverting input end of an integrated operational amplifier A5 is connected, one end of the resistor R16 is grounded, the other end of the resistor R16 is connected with the non-inverting input end of the integrated operational amplifier A6, the other end of the resistor R16 is also connected with one end of the resistor R15, the other end of the resistor R15 is connected with the output end of the integrated operational amplifier A5, the output end of the integrated operational amplifier A5 is connected with the input end of the central processing device, and the signal filtering unit transmits a voltage signal V1 to the ADC port of the central processing device.
7. The insulation board performance test platform of claim 1, wherein the central processing unit is an ARM processing chip.
8. The insulation board performance test platform of claim 1, wherein the display device is an LCD display.
9. The insulation board performance testing platform of claim 1, wherein the storage device further comprises a data reading interface.
10. The insulation board performance test platform of claim 1, wherein the temperature sensor is a thermistor.
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Application publication date: 20191227 |