Microwave heating device for DSR test
By designing a microwave heating device for DSR test and using magnetrons for microwave heating, the temperature uneven problem caused by traditional heat conduction heating methods is solved, the accuracy of the test data is improved, and the normal operation of DSR is maintained.
Patent Information
- Application Number
- CN202420135557.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-19
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-01-19
AI Technical Summary
The heat conduction heating method used in traditional DSR tests cannot effectively simulate the microwave heating process of absorbable microcapsules modified asphalt, resulting in uneven temperature inside the test piece, affecting the accuracy of the test data.
A microwave heating device for DSR test was designed, and microwave heating was performed using magnetrons, which could evenly heat the test piece, simulating the heating process of microcapsule modified asphalt in a microwave environment.
The uniform heating inside the test piece is achieved, the accuracy of the test data is improved, and the device can completely wrap the loading head and loading base of the DSR without affecting the normal operation of the DSR.
Smart Images
Figure CN222582612U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of asphalt performance testing equipment, and in particular relates to a microwave heating device for a DSR test of a wave-absorbing microcapsule modified asphalt. Background Art
[0002] Microcapsules are materials used for self-repair of microcracks in asphalt pavements. Their mechanism of action is to use nanoparticle encapsulation technology to integrate nano-micron capsules containing self-healing substances into the material. When stress concentration occurs at the tip of the pavement microcracks, causing the encapsulated material to rupture, the self-healing substances enter the microcracks through penetration, capillary action, and diffusion, thereby achieving the purpose of repairing the microcracks. The ability of microcapsules to repair microcracks is related to temperature. In order to improve its repair ability, absorbing materials such as nano-Fe 3 O 4 Microcapsules are prepared by using nano-carbon powder, nano-silicon carbide, etc. as capsule wall materials, which can realize the dual induced release of microwave heating stimulation release and thermal release triggered by stress at the tip of microcracks, greatly improving the self-healing effect of microcracks in asphalt pavement.
[0003] Dynamic shear rheology test is a main method to evaluate the self-healing performance of asphalt. A dynamic shear rheometer (DSR) is used to conduct fatigue-healing-fatigue tests on asphalt, and the self-healing performance of asphalt is reflected by comparing the modulus change curves of asphalt before and after healing. For microwave-absorbing microcapsule modified asphalt, microwave heating is the key link to correctly evaluate its self-healing performance. Traditional DSR often uses traditional water bath heating or energized coil heating and other heat conduction heating methods to control the temperature of asphalt materials during the test. It cannot simulate the microwave heating process of microwave-absorbing microcapsule modified asphalt. In addition, in the process of heating the specimen, the heat is transferred from the surface of the specimen to the inside of the specimen. When the surface temperature of the specimen reaches the set temperature, the heating stops. The actual temperature inside the specimen is affected by the specific heat capacity of the specimen, which leads to uneven temperature inside and outside the test, affecting the accuracy of the test data. Summary of the invention
[0004] The utility model provides a microwave heating device for a DSR test, which can not only realize that a test piece can be heated by microwave heating, but also can make the test piece be heated more uniformly.
[0005] To achieve the above-mentioned purpose, the utility model discloses a microwave heating device for DSR test, comprising a microwave heating box, in which a pressure head tube groove, a microwave heating chamber and a loading base tube groove are arranged in sequence from top to bottom, and the microwave heating chamber is connected to a magnetron through a waveguide tube.
[0006] Furthermore, there are two magnetrons, which are located on both sides of the microwave heating chamber.
[0007] Furthermore, the magnetron is connected to a switching power supply via a wire, and the switching power supply is connected to a main control board via a wire.
[0008] Furthermore, the switching power supply and the main control board are arranged in the power control box.
[0009] Furthermore, the microwave heating box comprises two butted microwave heating boxes, two opposite side walls of the power control box are provided with rotating shafts, and the side walls of the two microwave heating boxes are rotatably connected to the power control box through a hollow cantilever.
[0010] Furthermore, asbestos strips for heat preservation and insulation are arranged at the closing part of the microwave heating box.
[0011] Furthermore, a temperature measuring device is provided at the junction of the waveguide.
[0012] Furthermore, the temperature measuring device is an infrared temperature measuring device.
[0013] Furthermore, the inner wall of the microwave heating chamber is paved with a metal layer.
[0014] Furthermore, a lock is provided on the side wall B of the microwave heating box, and the side wall B is opposite to the side wall connected to the power control box body.
[0015] Compared with the prior art, the utility model has at least the following beneficial technical effects:
[0016] 1. The utility model utilizes a magnetron for microwave heating, so that the wave-absorbing and heating materials (such as microcapsule asphalt) can be heated by microwaves during the test process. When the test piece is exposed to microwaves, the wave-absorbing and heating materials inside the test piece absorb the microwaves at the same time and begin to heat up. Compared with the heat conduction method of transferring heat from the outside to the inside of the test piece, microwave heating is more uniform and improves the accuracy of the test data.
[0017] 2. The utility model can completely wrap the loading pressure head and loading base of the DSR, and has the ability of heat insulation and microwave shielding without affecting the normal operation of the DSR.
[0018] 3. The utility model can be connected to a terminal device to monitor the temperature of the test piece in real time, and the target temperature or target time can be set through the terminal device, which is easy to operate.
[0019] 4. The utility model is simple to operate, easy to install and small in size. When installing and replacing the test piece, you only need to open and close the microwave heating box. The structure of the device provides a sufficiently spacious operating space for installing and replacing the test piece. When in use, the device is directly installed on the DSR without occupying additional area. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a cross-sectional view of a microwave heating box;
[0021] Figure 2 It is a side view of the microwave heating box;
[0022] Figure 3 It is a top view of the microwave heating box;
[0023] Figure 4 This is the front view of the power control box;
[0024] Figure 5 This is a side view of the power control box;
[0025] Figure 6 This is a top view of the power control box.
[0026] In the attached figure: 1. microwave heating box; 2. magnetron; 3. microwave heating chamber; 4. pressure head tube groove; 5. waveguide tube; 6. loading pressure head; 7. loading base; 8. loading base tube groove; 9. temperature measuring device; 10. power control box; 11. rotating shaft; 12. hollow cantilever; 13. cantilever box connector; 14. asbestos strip; 15. main control board; 16. switching power supply; 17. test piece. DETAILED DESCRIPTION
[0027] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.
[0028] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0029] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. used herein indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0031] Example 1
[0032] A microwave heating device for DSR test mainly comprises a microwave heating box 1, a magnetron 2, a microwave heating chamber 3, a pressure head tube slot 4, a waveguide tube 5, a loading base tube slot 8, a temperature measuring device 9, a power control box 10, a rotating shaft 11, a hollow cantilever 12, a cantilever box connector 13, an asbestos strip 14, a main control board 15 and a switch power supply 16.
[0033] The magnetron 2 is an OM75P (31) ESGN Samsung magnetron, the switching power supply 16 is a MEGMEET Wepex 1000A microwave air-cooled variable frequency switching power supply, and the temperature measuring device 9 is an infrared temperature measuring device.
[0034] like Figures 1 to 6 As shown, the utility model provides a device for performing microwave heating on a test piece during a DSR test, comprising a power control box 10 and a first heating component and a second heating component docked together, wherein the first heating component and the second heating component have the same structure.
[0035] The first heating component includes a microwave heating box 1, and a pressure head tube groove assembly is reserved for the DSR loading pressure head 6 at the upper part of the opening side of the microwave heating box 1, and two pressure head tube groove assemblies form a pressure head tube groove 4, and a loading base tube groove assembly is reserved for the loading base 7 at the lower part of the opening side, and two loading base tube groove assemblies form a loading base tube groove 8, to ensure that the microwave heating box 1 can completely wrap the DSR loading pressure head 6 and the loading base 7 without affecting the normal operation of the DSR.
[0036] The microwave heating box 1 is provided with a magnetron 2, a temperature measuring device 9, a waveguide 5 and a microwave heating chamber assembly. The magnetron 2 is connected to the microwave heating chamber assembly through the waveguide 5. The temperature measuring device 9 is arranged at the junction of the waveguide 5 for real-time monitoring of the temperature of the DSR specimen 17. Two microwave heating chamber assemblies are butt-jointed to form a microwave heating chamber 3, and the microwave heating chamber 3 is located between the pressure head tube groove 4 and the loading base tube groove 8. The pressure head tube groove 4, the loading base tube groove 8 and the microwave heating chamber 3 are coaxially arranged.
[0037] The closing parts of the first heating component and the second heating component are respectively affixed with heat-insulating asbestos strips 14 . When the first heating component and the second heating component are closed, the asbestos strips 14 fit tightly to isolate the external temperature and keep the temperature in the microwave heating chamber 3 stable.
[0038] A switch power supply 16 and a main control board 15 are arranged in the power control box 10. Two opposite side walls of the power control box 10 are provided with a rotating shaft 11. The side walls A of the two microwave heating boxes 1 are connected to one end of the hollow cantilever 12 through the cantilever box connector 13, and the other end of the hollow cantilever 12 is rotatably connected to the power control box 10 through the rotating shaft 11.
[0039] The magnetron 2 in the microwave heating box 1 is connected to the switch power supply 16 in the power control box 10 through a wire, and the wire passes through the hollow cantilever 12 from the microwave heating box 1 to connect to the switch power supply 16 in the power control box 10. The switch power supply 16 is connected to the main control board 15 through a wire. The main control board 15 is connected to an external computer, and the computer controls the switch power supply 16 to turn on or off through the main control board 15, and the switch power supply 16 controls the magnetron 2 to start or stop working.
[0040] Example 2
[0041] The difference between this embodiment and Embodiment 1 is that the side wall B of the microwave heating box body 1 is provided with a lock, and the side wall B and the side wall A are two opposite side walls.
[0042] Here is the usage process of DSR's microwave heating temperature control device:
[0043] (1) When the heating device is installed on the DSR, the pressure head pipe groove 4 and the loading base pipe groove 8 can completely align the DSR loading pressure head 6 and the loading base 7, so that the two microwave heating boxes 1 can completely wrap the loading pressure head 6 and the loading base 7 when they are docked together, and the test piece is placed on the loading base 7. The rotating shaft 11 on the power control box 10 can rotate and drive the hollow cantilever 12, so that the two microwave heating boxes 1 connected to the hollow cantilever 12 are tightly docked together. Asbestos strips 14 for heat insulation are respectively attached to the closed parts of the two microwave heating boxes. When the microwave heating boxes on both sides are closed, the asbestos strips 14 fit tightly, isolate the external temperature, and maintain the temperature in the microwave heating chamber 3 stable. The inner wall surface of the microwave heating chamber 3 is completely paved with a metal layer, and the top and bottom of the heating box fit tightly with the DSR to prevent microwave leakage.
[0044] (2) The microwave heating time can be set using a terminal device (such as an external computer, mobile phone, tablet, etc.). When starting work, the terminal device transmits a heating start signal to the main control board 15. After receiving the heating start signal, the main control board 15 turns on the switch power supply 16, so that the magnetron 2 starts to emit microwaves; when the set microwave heating time is reached, the terminal device transmits a heating stop signal to the main control board 15. After receiving the heating stop signal, the main control board 15 controls the switch power supply 16 to turn off, so that the magnetron 2 stops emitting microwaves.
[0045] (3) The target temperature can be set using the terminal device. The temperature measuring device 9 is set at the junction of the waveguide 5, and is used to directly measure the temperature of the test piece 17, and transmit the temperature data to the main control board 15. The main control board 15 transmits the temperature data back to the terminal device in real time. When the temperature of the test piece does not reach the set temperature, the terminal device transmits a start signal to the main control board 15, and the main control board 15 controls the switch power supply 16 to turn on, so that the magnetron 2 starts to emit microwaves. When the temperature of the test piece reaches the set temperature, the terminal device transmits a stop signal to the main control board 15, and the main control board 15 controls the switch power supply 16 to turn off, so that the magnetron 2 stops emitting microwaves. Investigate the change law of the DSR test results of the wave-absorbing and heating material under the microwave heating environment.
[0046] (4) After the test is completed, the microwave heating box 1 is opened around the rotating axis 11 through the hollow cantilever 12.
[0047] This heating device can be used to explore the changing rules of DSR test results of microwave-absorbing and heating materials under microwave heating environment, thus broadening the application scenarios of DSR.
[0048] The term "consisting of..." describing a combination should include the identified elements, ingredients, components or steps and other elements, ingredients, components or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, components or steps herein also contemplates an embodiment consisting essentially of these elements, ingredients, components or steps.
[0049] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.
[0050] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of the subject matter, nor should it be considered that the applicant has not considered the subject matter as part of the disclosed utility model subject matter.
Claims
1. A microwave heating device for DSR test, characterized in that: The microwave heating box comprises a microwave heating box, in which a pressure head tube groove (4), a microwave heating chamber (3) and a loading base tube groove (8) are arranged in sequence from top to bottom, and the microwave heating chamber (3) is connected to the magnetron (2) via a waveguide tube (5).
2. A microwave heating device for DSR test according to claim 1, characterized in that: There are two magnetrons (2), which are respectively located on two sides of the microwave heating chamber (3).
3. A microwave heating device for DSR test according to claim 1, characterized in that: The magnetron (2) is connected to a switching power supply (16) via a wire, and the switching power supply (16) is connected to a main control board (15) via a wire.
4. A microwave heating device for DSR test according to claim 3, characterized in that: The switching power supply (16) and the main control board (15) are arranged in a power control box (10).
5. A microwave heating device for DSR test according to claim 4, characterized in that: The microwave heating box comprises two butted microwave heating box bodies (1); two opposite side walls of the power control box body (10) are provided with a rotating shaft (11); and the side walls of the two microwave heating box bodies (1) are rotatably connected to the power control box body (10) via a hollow cantilever (12).
6. A microwave heating device for DSR test according to claim 5, characterized in that: Asbestos strips (14) for heat insulation are arranged at the closed portion of the microwave heating box (1).
7. A microwave heating device for DSR test according to claim 1, characterized in that: A temperature measuring device (9) is provided at the junction of the waveguide tube (5).
8. A microwave heating device for DSR test according to claim 7, characterized in that: The temperature measuring device (9) is an infrared temperature measuring device.
9. A microwave heating device for DSR test according to claim 1, characterized in that: The inner wall of the microwave heating chamber (3) is paved with a metal layer.
10. A microwave heating device for DSR test according to claim 1, characterized in that: A lock buckle is provided on the side wall B of the microwave heating box, and the side wall B is opposite to the side wall connected to the power control box body (10).