CN106770442B - Instrument for measuring high-temperature heat transfer performance of asphalt pavement - Google Patents
Instrument for measuring high-temperature heat transfer performance of asphalt pavement Download PDFInfo
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- CN106770442B CN106770442B CN201611170925.6A CN201611170925A CN106770442B CN 106770442 B CN106770442 B CN 106770442B CN 201611170925 A CN201611170925 A CN 201611170925A CN 106770442 B CN106770442 B CN 106770442B
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- G01—MEASURING; TESTING
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention discloses an instrument for measuring high-temperature heat transfer performance of an asphalt pavement, which aims to accurately control the clamping force of a test piece, ensure that heat flow is uniformly transmitted downwards from the upper surface of the test piece, and facilitate the test piece to be taken and placed during a test, and adopts the following technical scheme: the heating device comprises a hollow integral outer frame, wherein a hot plate and a cold plate are sequentially arranged in the integral outer frame from top to bottom, a sample placing space is formed between the hot plate and the cold plate, the upper end of the hot plate is fixedly connected with a spiral feeding mechanism, the lower end of the cold plate is provided with a clamping force measuring mechanism, the hot plate comprises a fixed frame fixedly connected with the spiral feeding mechanism, a heating piece is arranged on the fixed frame, and a soaking copper plate is arranged at the lower end of the heating piece; a channel is arranged in the cold plate and provided with a water inlet and a water outlet.
Description
Technical Field
The invention belongs to the field of heat conductivity coefficient measurement, and particularly relates to an instrument for measuring high-temperature heat transfer performance of an asphalt pavement.
Background
The heat conductivity coefficient is one of important parameters reflecting the heat conductivity of materials, and the heat conductivity of the materials is considered in road traffic asphalt concrete pavement heat transfer, building outer wall heat insulation flitch, refrigeration house heat insulation interlayer, notebook heat dissipation copper pipes, kettles and other equipment in daily life. Therefore, it is important to accurately measure the parameter.
Conventional thermal conductivity meters typically clamp the sample by moving the cold plate and often do not accurately control the amount of clamping force due to operator feel, and do not accurately measure the parameters. In addition, the conventional thermal conductivity meter often cannot accurately control the temperature, resulting in a large error in the measurement result.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the instrument for measuring the high-temperature heat transfer performance of the asphalt pavement, which can accurately control the clamping force of the test piece, ensure that heat flow is uniformly transmitted from the upper surface of the test piece downwards, accurately control the temperature and facilitate the test piece to be taken and placed during the test.
In order to realize the purpose, the technical scheme adopted by the invention is as follows: the heat-measuring device comprises a hollow integral outer frame, wherein a hot plate and a cold plate are sequentially arranged in the integral outer frame from top to bottom, a sample piece placing space is arranged between the hot plate and the cold plate, the upper end of the hot plate is fixedly connected with a spiral feeding mechanism, the lower end of the cold plate is provided with a clamping force measuring mechanism, the hot plate comprises a fixed frame fixedly connected with the spiral feeding mechanism, a heating sheet is arranged on the fixed frame, the lower end of the heating sheet is provided with a soaking copper plate, a temperature sensor is arranged on the soaking copper plate, the soaking copper plate comprises a heat-protecting soaking copper plate, a through hole is formed in the center of the heat-protecting soaking copper plate, a central heat-measuring soaking copper plate is arranged in the through hole, and a gap is formed between the central heat-measuring soaking copper plate and the side edge of the through hole of the heat-protecting soaking copper plate; a channel is arranged in the cold plate and provided with a water inlet and a water outlet; the heating plate is connected with a temperature control device, and the temperature control device comprises a PC, a voltage output module, a signal amplifier, a relay, a fuse and a direct current power supply connected with the heating plate, wherein the PC, the voltage output module, the signal amplifier, the relay and the fuse are sequentially connected.
And an asbestos heat insulation layer is arranged at the upper end of the heating sheet.
The lower extreme of hot plate is provided with prevents that the hot plate is to radiating insulation construction all around, and on the sample spare was placed the cold plate during the experiment, insulation construction can cover on the sample spare.
And a heat-insulating material peripheral plate is arranged on the outer side of the heat-insulating structure.
The channels in the cold plate adopt double helix channels, the double helix channels adopt counter-flow type helical channels, and the cold plate helical water tank comprises two cold plates with opposite helical directions and water flow directions.
The whole outer frame is provided with guide pillars, two sides of the upper end of the hot plate are provided with first guide groove parts, two sides of the lower end of the cold plate are provided with second guide groove parts, and the first guide groove parts and the second guide groove parts are both in sliding connection with the guide pillars.
The clamping force measuring mechanism is an S-shaped pull pressure sensor.
The screw feeding mechanism comprises a lead screw vertically arranged on the whole outer frame, one end of the lead screw is fixedly connected with the hot plate through a bearing, and the other end of the lead screw is fixedly provided with a hand wheel.
Compared with the prior art, the heat conduction device is characterized in that the hot plate and the cold plate are arranged in the whole outer frame, the hot plate is positioned at the upper end of the cold plate, the sample piece is positioned on the cold plate during testing, the hot plate is driven to move downwards by the spiral feeding mechanism, the sample piece is tightly pressed between the hot plate and the cold plate, the pressure of the sample piece is transmitted to the clamping force measuring mechanism, the pressure information is obtained, the proper clamping force is adjusted, the temperatures of the hot plate and the cold plate are set, the sample piece is heated by the heating sheet during measurement, heat is transmitted to the sample piece, when the heat conduction process is in a stable state, the temperature difference between the upper surface and the lower surface of the asphalt block detected by the temperature sensor and the detected data such as power supply heating power are processed, and the heat conduction coefficient of the asphalt block is obtained. According to the invention, the clamping force of the sample piece can be accurately controlled through the clamping force measuring mechanism, the uniform downward transmission of heat flow from the upper surface of the sample piece is ensured, the sample piece is positioned on the cold plate, and the hot plate vertically displaces through the spiral feeding mechanism, so that the sample piece is conveniently taken and placed.
Furthermore, the heat plate transfers heat downwards through the soaking copper plate, the central heat-measuring soaking copper plate and the heat-protecting soaking copper plate are adopted to respectively perform main heating and auxiliary heating functions on the sample piece, the heat of the heat plate is guaranteed to be uniformly transferred to the upper surface of the sample piece, and the heat plate can be well contacted with the surface of the sample piece.
Furthermore, the upper end of the heating sheet is provided with an asbestos heat-insulating layer which is tightly attached to the heating sheet, so that heat can be effectively prevented from being transferred upwards.
Furthermore, the surface of the soaking copper plate is distributed with temperature sensors which can detect the surface temperature of the hot plate and feed back the temperature of the heat-protecting soaking copper plate so as to realize the temperature control of the hot plate.
Furthermore, the lower extreme of hot plate is provided with and prevents that the hot plate is to radiating insulation construction all around, and on the sample was placed the cold plate during the experiment, insulation construction can cover on the sample, can effectively reduce hot plate and sample to scattering and disappearing the heat all around.
Furthermore, the channel in the cold plate adopts double helix channel, and double helix channel adopts counterflow helical channel, including two spiral directions and the equal opposite cold plate spiral flume of rivers direction, and thermostatted water flows in by the water inlet, and the spiral flume through the cold plate flows back by the delivery port, and this kind of structure makes adjacent basin rivers opposite direction, has reduced the temperature inhomogeneity on cold plate surface greatly.
Further, the guide groove part is similar to a guide sleeve in effect, when the hot plate moves up and down, the guide groove parts on two sides of the hot plate are driven to slide up and down along the guide pillar on the whole frame, the effect of guiding and increasing the rigidity of the hot plate structure is achieved, the structure is simple, and the processing is convenient. The cold plate has guide slot parts on its two sides to ensure the rigidity of the clamp force measuring device and guide the small displacement of the cold plate.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic structural view of a hot plate;
FIG. 3 is a schematic view of a cold plate;
FIG. 4 is a schematic view of the construction of the guide channel member;
FIG. 5 is a schematic view of an assembled configuration of a cold plate and a hot plate;
the device comprises an overall outer frame 1, a first guide groove piece 2, a hot plate 3, a heat preservation structure 4, a cold plate 5, a spiral feeding mechanism 6, a bearing 7, a sample piece placing space 8, a heat insulation material peripheral plate 9, a clamping force measuring mechanism 10, a heat protection soaking copper plate 11, a gap 12, a central heat measurement soaking copper plate 13, a water inlet 14, a water outlet 15, a cold plate spiral water tank 16 and a second guide groove piece 17.
Detailed Description
The present invention will be further explained with reference to specific examples and drawings attached to the specification, but it should not be construed that the scope of the subject matter of the present invention is limited to the examples described below. Various substitutions and modifications can be made without departing from the technical idea of the invention and the scope of the invention according to the common technical knowledge and the conventional means in the field.
Referring to fig. 1, the invention mainly comprises an integral outer frame 1, a hot plate 3, a heat insulation structure 4, a cold plate 5, a spiral feeding mechanism 6 and a clamping force measuring mechanism 10, wherein the heat insulation structure 4 is an asbestos external protection heat insulation layer, the clamping force measuring mechanism 10 is an S-shaped tension and pressure sensor, the hot plate 3 is positioned above an instrument, the cold plate 5 is positioned below the instrument, a sample piece placing space 8 is formed between the hot plate 3 and the cold plate 5, the upper part of the hot plate 3 is connected with the spiral feeding mechanism 6 and can move up and down along the integral outer frame 1, and the lower part of the cold plate 5 is connected with the tension and pressure sensor. The screw feeding mechanism 6 comprises a screw rod vertically arranged on the whole outer frame 1, one end of the screw rod is fixedly connected with the hot plate 3 through a bearing 7, and the other end of the screw rod is fixedly provided with a hand wheel. After a sample piece is placed, the hot plate structure moves downwards by rotating the hand wheel at the top, the hand wheel is continuously rotated to apply pressure to the sample piece, pressure data is displayed on a computer display interface, and meanwhile, the clamping force applied to the sample piece is accurately controlled by adjusting the size of the clamping force through the hand wheel.
The whole outer frame 1 is provided with guide columns, two sides of the upper end of the hot plate 3 are provided with first guide groove parts 2, two sides of the lower end of the cold plate 5 are provided with second guide groove parts 17, and the first guide groove parts 2 and the second guide groove parts 17 are both in sliding connection with the guide columns.
Referring to fig. 2, the hot plate 3 includes the fixed frame who links firmly with screw feed mechanism 6, the last heating plate that is provided with of fixed frame, the heating plate upper end is provided with the asbestos heat preservation, the heating plate lower extreme is provided with the soaking copper, the soaking copper is including protecting hot soaking copper 11, it has the through-hole to protect the center of hot soaking copper 11, be provided with central calorimetric soaking copper 13 in the through-hole, be equipped with the crack 12 between central calorimetric soaking copper 13 and the through-hole side of protecting hot soaking copper 11, the lower extreme of hot plate 3 is provided with prevents that hot plate 3 is to radiating insulation construction 4 all around, the sample is placed on cold plate 5 during the experiment, insulation construction 4 can cover on the sample, insulation construction 4's the outside is provided with thermal-insulated material peripheral slab 9, be provided with temperature sensor on the soaking copper. The heating plate is connected with a temperature control device, the temperature control device comprises a PC, a voltage output module, a signal amplifier, a relay, a fuse and a direct current power supply which are sequentially connected, and the temperature control is carried out through the PC, a temperature sensor, the voltage output module, the amplifier, the relay, the fuse and a switch power supply which are provided with Labview software. The method comprises the specific steps that a Pulse Width Modulation (PWM) control circuit method is adopted through Labview software, the on and off of a switching power supply are further controlled through a voltage output module and a relay, and the power of a heating plate is adjusted, so that the temperature of the upper surface of asphalt contacted with a hot plate reaches the set temperature. The temperature control adopts an algorithm that: in order to improve the working efficiency of the instrument for measuring the high-temperature heat transfer performance of the asphalt pavement, the instrument adopts the following control algorithm: the temperature collected on the soaking copper plate is t1, the temperature collected on the cold plate is t2, when the temperature t1-t2 is more than 5 ℃, full-power heating is adopted, namely the power modulation of a direct-current power supply is maximum, and when the temperature t1-t2 is less than or equal to 5 ℃, PID is adopted to control the temperature of the hot plate.
Referring to fig. 3, a channel is arranged in the cold plate 5, the channel is provided with a water inlet 14 and a water outlet 15, the channel in the cold plate 5 adopts a double-helix channel, the double-helix channel adopts a counter-flow helical channel, and the double-helix channel comprises two cold plate helical water tanks 16 with opposite helical directions and water flow directions.
Referring to fig. 1, the working process of the invention: the spiral feeding mechanism 6 connected to the whole outer frame 1 in a rotating mode can achieve lifting of the hot plate structure, when the hot plate 3 rises to a proper position, a sample piece is placed in a sample piece placing space 8 formed by the hot plate 3 and the cold plate 5, then the spiral feeding mechanism 6 is rotated in the opposite direction to compress the sample piece, in the compression process, the sample piece transmits pressure to a clamping force measuring mechanism 10 connected below the cold plate 5, proper clamping force can be observed and adjusted through a display interface, the temperature is set for the hot plate 3 and the cold plate 5, when the temperature reaches a stable state, the heat conductivity coefficient of the sample piece can be obtained through calculation.
Referring to fig. 2, the hot plate is composed of a heating plate, a fixed frame, a central heat-measuring and heat-equalizing copper plate 13 and a heat-protecting and heat-equalizing copper plate 11, wherein the central heat-measuring and heat-equalizing copper plate 13 is of a rectangular structure of 150mmx150mm, the heat-protecting and heat-equalizing copper plate 11 is of a rectangular structure of 300mmx300mm, and a gap 12 is arranged between the central heat-measuring and heat-equalizing copper plate 13 and the heat-protecting and heat-equalizing copper plate 11. The lower extreme of hot plate 3 is equipped with insulation construction 4 all around, can effectively reduce hot plate 3 to scattering and disappearing the heat all around, and there are heating plate and asbestos heat preservation in hot plate 3 inside, and the heating plate is hugged closely to the asbestos heat preservation, can effectively prevent the heat upwards to transmit. The temperature sensor is arranged on the soaking copper plate below the heating sheet and used for measuring the temperature of the main heating plate and the heat protection plate and feeding back the temperature to the host machine to complete the control of the temperature of the heat protection plate. A lead screw with a hand wheel is connected above the hot plate 3, the lifting of the hot plate 3 can be adjusted by rotating the hand wheel, and the two sides of the hot plate 3 are respectively provided with a first guide groove part 2 with a guiding effect, so that the guiding effect can be achieved by moving the hot plate 3 up and down, and the integral rigidity of the hot plate structure can be improved.
Referring to fig. 3, the cold plate 5 is located below the whole structure, the left side and the right side of the cold plate are respectively provided with a constant temperature water inlet and outlet 14, the internal structure of the cold plate 5 is a double-spiral channel and comprises two cold plate spiral water grooves 16, the cold plate spiral water grooves 16 adopt a reverse-flow spiral channel, constant temperature water flows in from the water inlet 14 and flows back from the water outlet 15 through the cold plate spiral water grooves 16, the water flow directions of adjacent water grooves are opposite due to the design, the inflow and outflow are close to each other, the directions are opposite, the temperature unevenness on the surface of the cold plate 5 is greatly reduced, and the temperature of the cold plate 5 can be more uniform. The two sides of the cold plate 5 are also respectively provided with a second guide groove part 17, the rigidity is improved, the micro-guide effect can be achieved, the bottom of the cold plate 5 is connected with an S-shaped pull pressure sensor, and when a sample piece is subjected to pressure exerted by the hot plate 3, the sample piece can be transmitted to the pull pressure sensor on the lower portion of the cold plate 5, so that the pressure applied to the sample piece can be read.
Referring to fig. 4, the guiding groove members act like guiding sleeves, and when the hot plate 3 moves up and down, the first guiding groove members 2 on both sides of the hot plate 3 are driven to slide up and down along the guiding posts on the whole outer frame 1, so as to guide and increase the rigidity of the hot plate structure. The cold plate 5 also has a second guiding slot 17 on each side, which mainly ensures the rigidity of the clamping force measuring mechanism 10 and guides the small displacement movement of the cold plate 5.
Referring to fig. 5, the hot plate 3 is positioned above and the cold plate 5 is positioned below, during test measurement, a sample piece is placed on the cold plate 5, the hot plate 3 is moved downwards through the screw feeding mechanism 6, and the periphery of the sample piece is surrounded by the heat preservation structure 4, so that the heat preservation and insulation effects are achieved. When a sample piece is to be taken out, the spiral feeding mechanism 6 is rotated reversely, the hot plate 3 rises, the structure can play a role in heat insulation and heat preservation, the sample piece can be conveniently placed and taken, the heat preservation effect is good, and the structure is simple.
According to the invention, the lifting of the hot plate structure is adjusted by rotating the hand wheel on the top of the instrument, when the hot plate contacts a sample piece, the pressure is continuously applied, and the magnitude of the pressure value is adjusted through the data display interface. In addition, the instrument structure adopts the hot plate to construct under last cold drawing, and the sample piece is put into and is taken out conveniently moreover, can not appear the sample piece and block the phenomenon of not taking out because of the existence of heat preservation insulation construction.
Claims (8)
1. The instrument for measuring the high-temperature heat transfer performance of the asphalt pavement is characterized by comprising a hollow integral outer frame (1), wherein a hot plate (3) and a cold plate (5) are sequentially arranged in the integral outer frame (1) from top to bottom, a sample piece placing space (8) is arranged between the hot plate (3) and the cold plate (5), the upper end of the hot plate (3) is fixedly connected with a spiral feeding mechanism (6), the lower end of the cold plate (5) is provided with a clamping force measuring mechanism (10), the hot plate (3) comprises a fixed frame fixedly connected with the spiral feeding mechanism (6), a heating sheet is arranged on the fixed frame, the lower end of the heating sheet is provided with a soaking copper plate, a temperature sensor is arranged on the soaking copper plate, the soaking copper plate comprises a heat-protecting soaking copper plate (11), a through hole is formed in the center of the heat-protecting soaking copper plate (11), a central heat-measuring soaking copper plate (13) is arranged in the through hole, and a separation seam (12) is arranged between the central heat-measuring soaking copper plate (13) and the through hole on the side of the heat-protecting soaking copper plate (11); a channel is arranged in the cold plate (5), and the channel is provided with a water inlet and a water outlet; the heating plate is connected with a temperature control device, and the temperature control device comprises a PC, a voltage output module, a signal amplifier, a relay, a fuse and a direct current power supply which are connected with the heating plate in sequence.
2. The instrument as claimed in claim 1, wherein an asbestos layer is disposed on the upper end of the heating plate.
3. The instrument for measuring the high-temperature heat transfer performance of the asphalt pavement according to claim 2, wherein the lower end of the hot plate (3) is provided with a heat insulation structure (4) for preventing the heat dissipation of the hot plate (3) to the periphery, the sample piece is placed on the cold plate (5) during the test, and the heat insulation structure (4) can cover the sample piece.
4. The instrument for measuring the high-temperature heat transfer performance of the asphalt pavement according to claim 3, wherein an outer insulating material peripheral plate (9) is arranged on the outer side of the heat-insulating structure (4).
5. The instrument for measuring the high-temperature heat transfer performance of the asphalt pavement according to claim 1, wherein the channels in the cold plate (5) adopt double helix channels, the double helix channels adopt counter-flow type helical channels, and the instrument comprises two cold plate helical water tanks (16) with opposite helical directions and water flow directions.
6. The instrument for measuring the high-temperature heat transfer performance of the asphalt pavement according to claim 1, wherein the integral outer frame (1) is provided with guide posts, the hot plates (3) are provided with first guide groove members (2) on two sides of the upper end, the cold plates (5) are provided with second guide groove members (17) on two sides of the lower end, and the first guide groove members (2) and the second guide groove members (17) are slidably connected with the guide posts.
7. The instrument for measuring the high-temperature heat transfer performance of the asphalt pavement according to claim 1, wherein the clamping force measuring mechanism (10) is an S-shaped pulling and pressing force sensor.
8. The instrument for measuring the high-temperature heat transfer performance of the asphalt pavement according to claim 1, wherein the screw feeding mechanism (6) comprises a screw rod vertically arranged on the integral outer frame (1), one end of the screw rod is fixedly connected with the hot plate (3) through a bearing (7), and the other end of the screw rod is fixedly provided with a hand wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611170925.6A CN106770442B (en) | 2016-12-16 | 2016-12-16 | Instrument for measuring high-temperature heat transfer performance of asphalt pavement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611170925.6A CN106770442B (en) | 2016-12-16 | 2016-12-16 | Instrument for measuring high-temperature heat transfer performance of asphalt pavement |
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| Publication Number | Publication Date |
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| CN106770442A CN106770442A (en) | 2017-05-31 |
| CN106770442B true CN106770442B (en) | 2023-02-28 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426914B (en) * | 2018-03-20 | 2024-01-26 | 长安大学 | Measuring instrument for heat conductivity coefficient and specific heat capacity |
| CN113376207A (en) * | 2021-06-07 | 2021-09-10 | 长安大学 | Over-and-under type coefficient of heat conductivity test instrument of constant temperature basin |
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| CN103469715A (en) * | 2013-09-26 | 2013-12-25 | 南京林业大学 | Design method of inflaming retarding scheme of tunnel bituminous pavement structure |
| CN203630062U (en) * | 2013-12-06 | 2014-06-04 | 南京江宁分析仪器有限公司 | Thermal conductivity measuring apparatus |
| CN103969114A (en) * | 2014-04-15 | 2014-08-06 | 昆明理工大学 | Fatigue testing device of honeycomb panel and testing method |
| WO2016101903A1 (en) * | 2014-12-26 | 2016-06-30 | 怡维怡橡胶研究院有限公司 | Heat transfer coefficient measurement device |
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2016
- 2016-12-16 CN CN201611170925.6A patent/CN106770442B/en active Active
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|---|---|---|---|---|
| CN103469715A (en) * | 2013-09-26 | 2013-12-25 | 南京林业大学 | Design method of inflaming retarding scheme of tunnel bituminous pavement structure |
| CN203630062U (en) * | 2013-12-06 | 2014-06-04 | 南京江宁分析仪器有限公司 | Thermal conductivity measuring apparatus |
| CN103969114A (en) * | 2014-04-15 | 2014-08-06 | 昆明理工大学 | Fatigue testing device of honeycomb panel and testing method |
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