CN106769635B - Adjustable heat and mass transfer experimental device for heating asphalt pavement by microwave - Google Patents
Adjustable heat and mass transfer experimental device for heating asphalt pavement by microwave Download PDFInfo
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- CN106769635B CN106769635B CN201710164241.3A CN201710164241A CN106769635B CN 106769635 B CN106769635 B CN 106769635B CN 201710164241 A CN201710164241 A CN 201710164241A CN 106769635 B CN106769635 B CN 106769635B
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Abstract
The invention discloses an adjustable heat and mass transfer experimental device for microwave heating of an asphalt pavement, which comprises a main frame, a microwave heating mechanism arranged in the main frame, an electronic weighing instrument and a lifting mechanism for driving a weighing plate arranged in the main frame to move up and down to adjust the distance between the weighing plate and the microwave heating mechanism, wherein the electronic weighing instrument is arranged on the main frame, and the weighing plate is connected with the measuring end face of the electronic weighing instrument through the lifting mechanism. The invention skillfully solves the problem that the quality of the wet and old asphalt material is measured constantly when the asphalt material is heated; through adjusting the vertical distance between microwave heating mechanism and the weighing plate, not only can obtain the best heating distance, still make this experimental apparatus can carry out experimental study to the wet old pitch material of different thickness.
Description
Technical Field
The invention belongs to the technical field of research on heat and mass transfer of porous materials, and particularly relates to an adjustable heat and mass transfer experimental device for heating an asphalt pavement by microwaves.
Background
With the rapid development of economy, the construction of highways in China keeps a high-speed growth mode all the time, which also makes road traffic between cities more and more convenient, most of the road traffic is asphalt concrete pavements, the asphalt concrete pavements are easily damaged due to various factors, in order to prevent secondary damage to the pavements, damaged pavements need to be repaired in time, at present, the wet and old asphalt pavement materials generated by the repair of the asphalt concrete pavements in China every year are thousands of tons, the secondary utilization of the wet and old asphalt materials is urgently needed, and therefore the field heat regeneration technology is widely applied. The microwave heating technology is that microwaves are used as a heat source, the waste wet and old asphalt pavement is placed in a microwave field, and due to the existence of moisture in the waste wet and old asphalt pavement, polar water molecules in the waste wet and old asphalt material move and collide with each other under the action of the microwaves to generate heat, so that the wet and old asphalt pavement is heated. Due to the penetrability of the microwave, the surface temperature of the wet old asphalt pavement waste is not high in the heating process, but the internal and bottom temperatures are high, and a large amount of moisture overflows from the bottom. It can be seen that the microwave heating of the waste wet asphalt pavement is a heat and mass transfer process.
At present, all countries research equipment for on-site heat regeneration of waste wet and old asphalt pavements by microwaves, but a large amount of experimental research is not carried out on the heat and mass transfer phenomena in the process of heating the waste wet and old asphalt pavements by microwaves. Therefore, a heat and mass transfer experimental device for heating the wet and old asphalt pavement by microwaves is needed to be used for researching the heat and mass transfer phenomenon and the transfer principle thereof. Because the magnetron that uses among the microwave heating process also can produce certain radiation when producing the microwave, if protect improperly, will cause the radiation to reveal, cause the harm to experimenter's healthy. And for the waste materials of the studied wet old asphalt pavement, the heat and mass transfer experimental device is required to have strong practicability due to uncertain area size and height.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an adjustable heat and mass transfer experimental device for microwave heating of an asphalt pavement, and aims to facilitate adjustment of the distance between an asphalt material and a microwave heating mechanism and measurement of the quality of the asphalt material at any time.
In order to achieve the purpose, the invention adopts the technical scheme that:
the heat and mass transfer experimental device comprises a main frame and a microwave heating mechanism arranged in the main frame, and further comprises an electronic weighing instrument and a lifting mechanism which is used for driving a weighing plate arranged in the main frame to move up and down to adjust the distance between the weighing plate and the microwave heating mechanism, wherein the electronic weighing instrument is arranged on the main frame, and the weighing plate is connected with the measuring end face of the electronic weighing instrument through the lifting mechanism.
The main frame includes "[" shape main part, locates the first supporting component in "[" shape main part and locates the second supporting component on the first supporting component, and first supporting component includes four first ribs, the second supporting component includes four second ribs and four second connecting ribs, and four first ribs are connected with the last plate body inner wall of "[" shape main part, the top of four second ribs respectively with the bottom fixed connection of four first ribs, the bottom of adjacent second rib is passed through the second connecting rib and is connected, and the up end of "[" shape main part upper plate body is equipped with the recess that is used for joint electron weighing instrument.
Ribbed plates are arranged at the two right-angle bending positions of the [ -shaped main body. The ribbed slab is a right-angled triangle reinforcing rib.
The cross sections of the first ribs and the second ribs are both L-shaped structures.
The lifting mechanism is a gear lifting mechanism.
The gear lifting mechanism comprises a bevel gear set, a screw rod sliding block, a nut mounting block, a supporting plate, a transmission shaft arranged on the supporting plate and a fixing plate group which is used for supporting and guiding the transmission shaft to move in the horizontal direction and is fixedly connected with the supporting plate, the measuring end face of the electronic weighing instrument is connected with the bottom end face of the supporting plate, the nut mounting block is fixedly connected with the weighing plate, one end of the screw rod sliding block connecting supporting plate is connected with the transmission shaft through the bevel gear set, and the other end of the screw rod sliding block is in threaded connection with the nut mounting block.
The gear lifting mechanism further comprises a height adjusting handle connected with one end of the transmission shaft.
The gear lifting mechanism further comprises a motor driving mechanism for driving the transmission shaft to rotate.
The fixed plate group comprises two fixed plates, the two fixed plates are fixed on the supporting plate, and the transmission shaft penetrates through center holes of the two fixed plates and can rotate relative to the fixed plates.
The two screw rod sliding blocks and the two nut mounting blocks are respectively connected with two ends of the weighing plate, and the two screw rod sliding blocks are respectively connected with two ends of the supporting plate.
The two ends of the weighing plate are provided with fixed guide plates, guide grooves are formed in the fixed guide plates, the nut mounting block is fixedly connected with the fixed guide plates, and the lead screw sliding block moves up and down along the guide grooves through rotation.
The microwave heating mechanism comprises a radiation cavity, an excitation cavity and a magnetron detachably and fixedly connected with the excitation cavity, and the radiation cavity is connected with the excitation cavity in a welding mode. The radiation cavity is a pyramid horn-shaped heating cavity.
The experimental device also comprises a blowing mechanism for radiating the magnetron. The blowing mechanism is a fan.
The experimental device comprises a main frame, a microwave heating mechanism, a bearing plate, a transverse and longitudinal movement adjusting mechanism and a control device, wherein the bearing plate is used for bearing the microwave heating mechanism and is arranged in the main frame and connected with the main frame, and the transverse and longitudinal movement adjusting mechanism is used for adjusting the microwave heating mechanism to perform transverse and longitudinal movement along the plane where the bearing plate is located.
The transverse and longitudinal movement adjusting device comprises two first sliding guide rails, two second sliding guide rails and guide rail sliding blocks arranged on the first sliding guide rails and the second sliding guide rails, the two ends of each second sliding guide rail are connected with the guide rail sliding blocks on the first sliding guide rails through first mounting blocks respectively, and the two side sides of the microwave heating mechanism are connected with the guide rail sliding blocks of the two second sliding guide rails through second mounting blocks respectively.
At least one of the two second sliding guide rails is provided with two positioning blocks capable of sliding back and forth along the second sliding guide rail, the two positioning blocks are respectively positioned at two sides of the guide rail slide block of the second sliding guide rail, and each positioning block is provided with a positioning bolt.
The bottom end of the main frame is provided with a lockable rolling wheel.
The experimental device also comprises a metal shielding device used for housing the main frame.
The invention has the beneficial effects that: the invention skillfully solves the problem of measuring the quality of wet and old asphalt materials at any time during heating by connecting the main frame, the electronic weighing instrument and the weighing plate gear lifting mechanism; the gear lifting mechanism can obtain the optimal heating distance by adjusting the vertical distance between the pyramid horn heating cavity and the weighing plate, and the experimental device can also carry out experimental research on wet and old asphalt materials with different thicknesses; the transverse and longitudinal movement adjusting mechanism horizontally adjusts the two microwave heating mechanisms connected to the sliding block through the guide rail in the transverse and longitudinal directions, so that the optimal coupling distance can be obtained, and the experimental device can perform experimental research on wet and old asphalt materials with different areas; the main frame is designed into a [ -shape, so that the installation of other devices is facilitated, and the ribbed plates are arranged in the main frame, so that the strength is increased, and the electronic weighing instrument can be kept in a horizontal state; the small fan is added, so that the heat dissipation of the magnetron can be continuously performed in the microwave generating process, the magnetron is prevented from being burnt due to overheating, and the experiment cost is reduced. The heat and mass transfer experimental device has the advantages of simple structure, complete functions and convenient operation.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a side view of the present invention;
FIG. 4 is a front view of the gear lift mechanism of the present invention;
FIG. 5 is a side view of the gear lift mechanism of the present invention;
FIG. 6 is an elevational view of the lateral and longitudinal movement adjustment mechanism of the present invention;
FIG. 7 is a side view of the lateral and longitudinal movement adjustment mechanism of the present invention;
FIG. 8 is a top view of the lateral and longitudinal movement adjustment mechanism of the present invention;
FIG. 9 is a front elevational view of the microwave heating mechanism of the present invention;
fig. 10 is a side view of the microwave heating mechanism of the present invention.
Labeled as:
1. metal shielding net, 2, a height adjusting handle, 3, a supporting plate, 4, an electronic weighing instrument, 5, a conical gear set, 6, an upper ribbed plate, 7, a fan, 8, a bearing plate, 9, a main frame, 10, a pyramid horn radiation cavity, 11, a lockable rolling wheel, 12, a weighing plate, 13, a lower ribbed plate, 14, a screw rod slider, 15, a second sliding guide rail, 16, a first sliding guide rail, 17, a transmission shaft, 18, a fixing plate, 19, a wiring port, 20, a first rib, 21, a guide rail slider, 22, a magnetron, 23, a mounting hole, 24, a nut mounting block, 25, an excitation cavity, 26, a second rib, 27, a second connecting rib, 28 and a fixed guide plate.
Detailed Description
The following detailed description of the embodiments of the present invention is provided to help those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to help them implement, by referring to the accompanying drawings and the description of the embodiments.
As shown in fig. 1 to 10, the invention specifically relates to an adjustable heat and mass transfer experimental device for microwave heating of an asphalt pavement, which comprises a main frame 9, a microwave heating mechanism arranged in the main frame 9, an electronic weighing instrument 4 and a lifting mechanism for driving a weighing plate 12 arranged in the main frame 9 to move up and down to adjust the distance between the weighing plate 12 and the microwave heating mechanism, wherein the electronic weighing instrument 4 is arranged on the main frame 9, and the weighing plate 12 is connected with a measuring end face of the electronic weighing instrument 4 through the lifting mechanism.
The main frame 9 is used for installing each mechanism of the experimental device, so that the main frame 9 needs to have good rigidity and strength, and the stainless steel material has good rigidity and strength, so that the main frame 9 is processed by cutting and cutting the stainless steel plate. The main frame 9 comprises a [ -shaped main body, a first supporting component arranged in the [ -shaped main body and a second supporting component arranged on the first supporting component, the first supporting component comprises four first ribs 20, the second supporting component comprises four second ribs 26 and four second connecting ribs 27, the four first ribs 20 are connected with the inner wall of an upper plate body of the [ -shaped main body, the top ends of the four second ribs 26 are fixedly connected with the bottom ends of the four first ribs 20 respectively, the bottom ends of the adjacent second ribs 26 are connected through the second connecting ribs 27, and a groove used for clamping the electronic weighing instrument 4 is formed in the upper end face of the [ -shaped main body. The recess is located in the middle of the up end of "[" shape main part upper plate body, and the electron weighing instrument carries out the location through the card income recess and fixes a position, can be equipped with flexible seal gasket in the recess, has the effect of buffering on the one hand, and on the other hand can make the electron weighing instrument interference card go into the recess, avoids appearing rocking. Ribbed plates are arranged at two right-angle bending positions of the [ -shaped main body. The upper rib plate 6 and the lower rib plate 13 are respectively provided, and the upper rib plate and the lower rib plate are both right-angled triangle reinforcing ribs, so that the main frame 9 can not bend or deform under the condition of bearing heavier weight. The main frame 9 is designed into a [ -shape to ensure that the weighing instrument 4 can be kept in a horizontal state during the experiment, and in order to further ensure the rigidity of the main frame 9 and ensure that the electronic weighing instrument 4 is kept in a horizontal state, some small beams, namely an upper rib plate 6 and a lower rib plate 13, are added in the main frame 9 and are connected with the main frame 9 through welding. The first ribs 20 and the second ribs 26 are preferably L-shaped in cross-section.
The upper end of a range sensor of the electronic weighing instrument is connected with a gear lifting mechanism, the electronic weighing instrument 4 is connected with a weighing plate 12 through the gear lifting mechanism, the electronic weighing instrument measures the mass of the wet and old asphalt pavement materials placed on the weighing plate 12, and when the wet and old asphalt pavement materials are not placed on the weighing plate 12, the indicating number of the electronic weighing instrument 4 at the moment is recorded, namely the total weight of the gear lifting mechanism and the weighing plate; then the wet old asphalt material is placed on the weighing plate 12, then the readings of the electronic weighing instrument 4 are recorded, the mass of the wet old asphalt material is calculated out through the difference value of the readings at the front and the back, the asphalt pavement material is heated by the microwave heating device, the polar water molecules in the wet old asphalt pavement material rotate and collide with each other, the moisture is transmitted to the bottom, the mass of the wet old asphalt pavement material is further changed, and the condition of the change of the internal mass of the asphalt pavement material can be obtained constantly through the electronic weighing instrument 4.
Wherein, elevating system is gear elevating system. The gear lifting mechanism comprises a bevel gear set 5, a screw rod sliding block 14, a nut mounting block 24, a support plate 3, a transmission arranged on the support plate 3, a fixing plate set 17 and a clamping groove, wherein the fixing plate set is used for supporting and guiding the horizontal movement of the transmission shaft 17 and is fixedly connected with the support plate 3; the measuring end face of the electronic weighing instrument can be fixedly connected with the supporting plate through a fastener, or a clamp capable of clamping the measuring end face of the electronic weighing instrument is arranged, and the clamp and the supporting plate are detachably and fixedly connected through the matching of bolts and nuts; the nut mounting block 24 is fixedly connected with the weighing plate 12, one end of the screw rod sliding block 14, which is connected with the supporting plate 12, is connected with the transmission shaft through the bevel gear set 5, and the other end of the screw rod sliding block 14 is in threaded connection with the nut mounting block 24. In order to rotate the transmission shaft, a height adjusting handle 2 can be arranged at one end of the transmission shaft, the transmission shaft 17 is installed and positioned through a fixing plate 18, and the horizontal rotation generated by the transmission shaft 17 driven by the handle 2 can be converted into the rotary motion of the screw rod sliding block 14 through the matched rotation of the bevel gear set 5, so that the installation block 24 is driven to move up and down. The height adjusting handle 2 is rotated to realize the height adjustment of the heating platform, the length of the screw rod sliding block 14 is long enough, the adjusting range is wider, and the research on the mass transfer rule of wet and old asphalt pavements with various thicknesses is met. Of course, another mode can also be adopted to realize the rotation of the transmission shaft, specifically, the gear lifting mechanism further comprises a motor driving mechanism, the transmission shaft is driven to rotate by providing power through a servo motor, the bevel gear set 5 installed on the transmission shaft 17 is matched with the screw rod sliding block 14 to drive the screw rod sliding block 14 to rotate in the vertical direction, and when the screw rod sliding block 14 rotates, the nut installation block 24 matched with the screw rod sliding block drives the weighing plate 12 to realize the lifting motion. The motor drive mechanism is well known in the art and will not be described in greater detail herein.
The fixed plate group comprises two fixed plates 18, the two fixed plates 18 are fixed on the supporting plate and can be fixed at two ends of the supporting plate, and the transmission shaft penetrates through center holes of the two fixed plates 18 and can rotate relative to the fixed plates 18. The number of the screw rod sliding blocks 14 and the number of the nut mounting blocks 24 are two, the two nut mounting blocks 24 are respectively connected with two ends of the weighing plate 12, and the two screw rod sliding blocks 14 are respectively connected with two ends of the supporting plate 12. The connection mode can be welding, and can also be through fastening connection of fastener. Fixed guide plates 28 are arranged at two ends of the weighing plate 12, guide grooves are formed in the fixed guide plates 28, the nut mounting block 24 is fixedly connected with the fixed guide plates 28, and the screw rod sliding block 14 moves up and down along the guide grooves through rotation.
A bearing plate 8 for bearing the microwave heating mechanism is arranged in the main frame 9, four ends of the bearing plate 8 are welded with the main frame, specifically, a supporting block can be arranged at the bottom end of the first rib, the supporting block is fixedly connected with the first rib, four ends of the bearing plate 8 are fixed on the supporting block, and the fixed connection mode can be welding or fastening connection through a fastener; or the first rib and the second rib are also arranged into a [ -shaped integrated structure, the [ -shaped integrated structure or the supporting block is more convenient for the installation, the connection and the fixation of the bearing plate, the stability is better, and the experimental device also comprises a transverse and longitudinal movement adjusting mechanism which is used for adjusting the microwave heating mechanism to perform transverse and longitudinal movement along the plane where the bearing plate 8 is located.
The transverse and longitudinal movement adjusting mechanism comprises two first sliding guide rails 16, two second sliding guide rails 15 and guide rail sliding blocks 21 arranged on the first sliding guide rails 16 and the second sliding guide rails 15, two ends of each second sliding guide rail 15 are connected with the guide rail sliding blocks on the first sliding guide rails 16 through first mounting blocks respectively, and two side edges of the microwave heating mechanism are connected with the guide rail sliding blocks of the two second sliding guide rails 15 through second mounting blocks respectively. Countersunk holes are drilled at the two ends and the middle of the first sliding guide rail, and the first sliding guide rail is directly and transversely arranged on the bearing plate through the countersunk holes by screws, so that the screws can be embedded into the sliding guide rail, and the sliding of a guide rail sliding block on the first sliding guide rail is not influenced. The connection of the second sliding guide rail and the second mounting block can also be realized by screws. Through the synergistic effect of the guide rail sliding blocks on the first sliding guide rail and the second sliding guide rail, the microwave heating device can be adjusted transversely and longitudinally, the first sliding guide rail can be set to be a transverse sliding guide rail during setting, the second sliding guide rail can be set to be a longitudinal sliding guide rail, and the length of the first sliding guide rail can be set to be larger than that of the second sliding guide rail. Installation between microwave heating mechanism and the second sliding guide, installation between second sliding guide and the first sliding guide all use the indirect installation of installation piece, and the reason is, the size difference between them, can not the direct mount, simultaneously, in the installation dismantlement in-process repeatedly, can destroy sliding guide or microwave heating mechanism's heating chamber, it is more convenient and with low costs with the replacement of installation piece. The sliding guide rails which are mutually vertical in space move in a coordinated manner to realize the transverse and longitudinal movement of the device, and a good regulation and control basis is provided for the optimal coupling between the adjacent heating cavities. At least one of the two second sliding guide rails is provided with two positioning blocks capable of sliding back and forth along the second sliding guide rail, the two positioning blocks are respectively positioned on two sides of the guide rail slide block of the second sliding guide rail, each positioning block is provided with a positioning bolt, and the microwave heating device is fixedly positioned by adjusting the positioning bolts to ensure that the two positioning blocks and the second sliding guide rail are fixedly restrained.
The microwave heating mechanism comprises a radiation cavity, an excitation cavity 25 and a magnetron 22 which is detachably and fixedly connected with the excitation cavity 25, and the radiation cavity is connected with the excitation cavity 25 in a welding mode. The radiation chamber and the excitation chamber together form a heating chamber, and the radiation chamber is preferably a pyramid horn shaped heating chamber 10. One end of the magnetron 22, which is far away from the radiation cavity, is provided with a wiring port 19; the two sides of the conical horn radiation cavity 10 near one end of the magnetron 22 are connected with the guide rail slide blocks 21 on the two second sliding guide rails 15 through mounting blocks. The top end of the pyramid horn radiation cavity 10 is drilled with a mounting hole 23, the mounting hole 23 is matched with a mounting hole of the magnetron 22, and the mounting hole are installed through bolts. After the wiring port 19 is connected with a high-voltage power supply, the magnetron 22 emits microwaves, and a high-frequency alternating microwave field is generated after the microwaves are enhanced through the excitation cavity 25 and the pyramidal horn radiation cavity 10, and the microwaves are used for heating, namely, wet and old asphalt pavement materials are used as dielectric materials and placed in the high-frequency alternating microwave field generated by the pyramidal horn radiation cavity 10, and under the action of the microwaves, polar water molecules in the asphalt pavement materials rotate and rub at high speed, so that a large amount of heat is generated, and the wet and old asphalt pavement materials are heated. It can be seen from the side view of the microwave heating mechanism in fig. 10 that the radiation cavity 10 is designed into a pyramid horn shape, and it is known from huygens' principle that the pyramid horn-shaped structure can be used as a microwave transmission line to transmit microwaves to generate high-frequency electromagnetic waves of a required mode, and can also improve the radiation efficiency of the electromagnetic waves, and meanwhile, the pyramid horn-shaped structure is convenient for adjusting the included angles between the H-plane and the E-plane and the ground, and is convenient for designing pyramid horn heating cavities of different shapes for comparison of experiments. When the experimental device is installed, after the high-voltage power supply of the wiring port 19 of the magnetron 22 is switched on, the magnetron 22 starts to generate microwaves, when the microwaves are used for heating and regenerating wet and old asphalt pavement, moisture in the wet and old asphalt pavement is continuously transmitted to the bottom of the asphalt pavement, so that the quality is continuously changed, a mass transfer process is formed, the condition of the change of the internal quality of the wet and old asphalt can be obtained constantly through the electronic weighing instrument 4, and the mass transfer process is researched.
In order to solve the problem that when a single heating cavity heats the wet and old asphalt road fabric, the inside polar water molecules at the edge part of the single heating cavity cannot be heated, the two heating cavities are adopted to be heated simultaneously to enlarge the heating area, meanwhile, a transverse and longitudinal movement adjusting mechanism is utilized to carry out transverse and longitudinal horizontal adjustment between the two heating cavities, the horizontal distance between the two heating cavities is controlled, the optimal coupling relation is obtained by adjusting the distance between the two heating cavities, so that the polar molecules inside the wet and old asphalt road fabric can rotate and rub quickly to generate heat for heating, and the temperature of the surface of the wet and old asphalt material in the heating process is measured by an infrared thermometer constantly. In addition, the experimental device also comprises a blowing mechanism for radiating the magnetron. The blowing mechanism is a fan 7. The fan is through tight screw fixed mounting on the second installation piece for the magnetron can continuously dispel the heat at the in-process that produces the microwave, prevents that the magnetron from overheated by scaling loss, has reduced the experiment expense.
In order to facilitate the transportation of the whole heat and mass transfer experimental device and keep the main frame horizontal during the experiment, four lockable rolling wheels 11 with the same model are designed at the bottom end of the main frame 9. The lockable rolling wheel 11 comprises a coaxially mounted metal locking pedal, and the rotation and stop of the lockable rolling wheel are controlled by pressing and loosening the metal locking pedal. The lockable rolling wheel 11 can rotate axially at will, and movement and position adjustment in the experiment process are met.
The outside of the main frame 9 is wrapped by a metal shielding device, the metal shielding device can adopt a metal shielding net 1, when the heat and mass transfer experimental device starts to work, a magnetron 22 generates a large amount of microwaves to heat wet and old asphalt pavement materials, and the metal shielding net 1 has the main function of shielding some microwave radiations leaked out by the heat and mass transfer experimental device and preventing the microwave radiations from harming the physical health of experimenters. The metal shielding device 1 mainly comprises four supporting frames and eight L-shaped metal plates, wherein every four L-shaped metal plates are connected through screws to form two groups of frames on the top surface and the bottom surface, and the frames are detachably mounted. Specifically, in order to ensure that the connection and installation of the support frame and the upper and lower frames are stable enough, two bolt fasteners are adopted to connect the support frame and the top and bottom frames, the use of the bolt fasteners enables the connection strength to be higher, and meanwhile, the rotation between the bolt fasteners and the top and bottom frames can be prevented from being generated, and the shielding effect of the metal shielding device 1 on microwave radiation can be prevented from being influenced; the top surface frame is designed into a rectangle according to the area of the main frame and is supported by the four supporting frames, the connection mode is convenient, the whole metal shielding device is more stable due to the use of the bolt fastening piece, and the strength and the stability required by the target can be achieved.
According to the invention, the horizontal and longitudinal adjustment of the horizontal plane of the heating cavity is realized through the first and second sliding guide rails and the guide rail sliding block arranged on the first and second sliding guide rails; meanwhile, the height adjusting handle is rotated to drive the weighing plate through the gear lifting mechanism to adjust the distance between the heating cavity and the weighing plate, so that the height adjustment is realized, the adjusting range is wide, the adaptability is strong, and the heat and mass transfer research of wet and old asphalt pavements with different heights and irregular heights can be adapted; the research on the mass transfer experiment of the wet and old asphalt pavement is realized through a weighing instrument and a weighing plate; the research on the heat transfer experiment of the wet and old asphalt pavement is realized through the magnetron and the heating cavity.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the above-mentioned conception and technical solutions of the present invention may be directly applied to other fields without any improvement, and all of them are within the scope of the present invention.
Claims (5)
1. The utility model provides a microwave heating bituminous paving's heat and mass transfer experimental apparatus with adjustable, includes the main frame, locates the microwave heating mechanism in the main frame, its characterized in that: the experimental device also comprises an electronic weighing instrument and a lifting mechanism for driving the weighing plate arranged in the main frame to move up and down to adjust the distance between the weighing plate and the microwave heating mechanism, wherein the electronic weighing instrument is arranged on the main frame, and the weighing plate is connected with the measuring end face of the electronic weighing instrument through the lifting mechanism;
the lifting mechanism is a gear lifting mechanism; the gear lifting mechanism comprises a bevel gear set, a screw rod sliding block, a nut mounting block, a supporting plate, a transmission shaft arranged on the supporting plate and a fixed plate group which is used for supporting and guiding the horizontal movement of the transmission shaft and is fixedly connected with the supporting plate, the measuring end face of the electronic weighing instrument is connected with the bottom end face of the supporting plate, the nut mounting block is fixedly connected with the weighing plate, one end of the screw rod sliding block, which is connected with the supporting plate, is connected with the transmission shaft through the bevel gear set, and the other end of the screw rod sliding block is in threaded connection with the nut mounting block; the two screw rod sliding blocks and the two nut mounting blocks are respectively connected with two ends of the weighing plate, and the two screw rod sliding blocks are respectively connected with two ends of the supporting plate; the two ends of the weighing plate are respectively provided with a fixed guide plate, a guide groove is formed in the fixed guide plate, the nut mounting block is fixedly connected with the fixed guide plate, and the lead screw sliding block moves up and down along the guide groove through rotation;
the microwave heating mechanism comprises a radiation cavity, an excitation cavity and a magnetron detachably and fixedly connected with the excitation cavity, and the radiation cavity is connected with the excitation cavity in a welding mode.
2. The adjustable heat and mass transfer experimental device for heating the asphalt pavement by microwaves according to claim 1, which is characterized in that: the experimental device also comprises a blowing mechanism for radiating the magnetron.
3. The adjustable heat and mass transfer experimental device for heating the asphalt pavement by microwaves according to claim 1, is characterized in that: the experimental device comprises a main frame, a bearing plate and a transverse and longitudinal movement adjusting mechanism, wherein the main frame is internally provided with the bearing plate for bearing the microwave heating mechanism, the bearing plate is connected with the main frame, and the transverse and longitudinal movement adjusting mechanism is used for adjusting the microwave heating mechanism to perform transverse and longitudinal movement along the plane where the bearing plate is located.
4. The adjustable heat and mass transfer experimental device for heating the asphalt pavement by microwaves according to claim 3, wherein the device is characterized in that: the transverse and longitudinal movement adjusting device comprises two first sliding guide rails, two second sliding guide rails and guide rail sliding blocks arranged on the first sliding guide rails and the second sliding guide rails, the two ends of each second sliding guide rail are connected with the guide rail sliding blocks on the first sliding guide rails through first mounting blocks respectively, and the two side sides of the microwave heating mechanism are connected with the guide rail sliding blocks of the two second sliding guide rails through second mounting blocks respectively.
5. The adjustable heat and mass transfer experimental device for heating the asphalt pavement by microwaves according to claim 1, which is characterized in that: the experimental device also comprises a metal shielding device used for housing the main frame.
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| CN201710164241.3A CN106769635B (en) | 2017-03-20 | 2017-03-20 | Adjustable heat and mass transfer experimental device for heating asphalt pavement by microwave |
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| CN201710164241.3A CN106769635B (en) | 2017-03-20 | 2017-03-20 | Adjustable heat and mass transfer experimental device for heating asphalt pavement by microwave |
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| CN106769635B true CN106769635B (en) | 2023-02-24 |
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| CN108125259A (en) * | 2017-12-25 | 2018-06-08 | 芜湖皖江知识产权运营中心有限公司 | A kind of nut purifier and its purification method |
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